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EP0214554A2 - Down-hole device for transmitting information from a well - Google Patents

Down-hole device for transmitting information from a well Download PDF

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Publication number
EP0214554A2
EP0214554A2 EP86111862A EP86111862A EP0214554A2 EP 0214554 A2 EP0214554 A2 EP 0214554A2 EP 86111862 A EP86111862 A EP 86111862A EP 86111862 A EP86111862 A EP 86111862A EP 0214554 A2 EP0214554 A2 EP 0214554A2
Authority
EP
European Patent Office
Prior art keywords
outer tube
drive
throttle valve
pressure
hollow body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86111862A
Other languages
German (de)
French (fr)
Other versions
EP0214554B1 (en
EP0214554A3 (en
Inventor
Heinz Dipl.-Ing. Wallussek
Michael Dipl.-Ing. Ostkämper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bergwerksverband GmbH
Schwing Hydraulik Elektronik GmbH and Co
Original Assignee
Bergwerksverband GmbH
Schwing Hydraulik Elektronik GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bergwerksverband GmbH, Schwing Hydraulik Elektronik GmbH and Co filed Critical Bergwerksverband GmbH
Priority to AT86111862T priority Critical patent/ATE48179T1/en
Publication of EP0214554A2 publication Critical patent/EP0214554A2/en
Publication of EP0214554A3 publication Critical patent/EP0214554A3/en
Application granted granted Critical
Publication of EP0214554B1 publication Critical patent/EP0214554B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • E21B47/18—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry

Definitions

  • the invention relates to a device, in particular for use underground for the remote transmission of information from a borehole according to the preamble of claim 1.
  • Such a device is known from DE-PS 30 28 813.
  • a throttle valve is arranged in the drill pipe so that the flushing liquid flows around it. All devices required to drive the throttle valve form a structural unit with the throttle valve. They are supplied with energy via ducts, which are guided through webs which connect the throttle valve to the drill pipe wall and lie in the flushing agent flow.
  • the flushing liquid drives such drill rods as known from DE-PS 21 61 353, usually via a turbine, the drill bit.
  • the flushing liquid is mixed with fine material such as cuttings, the webs and the turbine are exposed to a very abrasive flow, which quickly leads to their destruction. If a turbine is not used, i.e. if the drill pipe itself is used as the drive for the drill bit, the drive units for the throttle valve and the transmission elements for the signals from the measuring instruments to the throttle valve are exposed to heavy loads due to the drilling activity and the rotary movement.
  • a rotating drill pipe is also known in the prior art, in which an inner tube rotates in the area of the drill bit bar is arranged in a fixed outer tube.
  • This part of the drill pipe is also called the target drill rod.
  • a target boring bar is a drill pipe installed in the drill string train, which receives and transmits measured values that originate from measuring devices and monitors in the target boring bar. The measured values provide information about the course of the bore, ie about any deviations from a predetermined direction of the borehole, while the guards provide measured values which enable the function monitoring of the various devices of such a target boring bar and which are provided with a device for correcting the bore.
  • Such a device generally consists of a plurality of control strips pivotally mounted on the outer tube, which are supported on the joints of the borehole and can be individually adjusted via hydraulically actuatable cylinders in order to correct the direction of the drill pipe.
  • a target boring bar is known for example from DE-OS 30 00 239.2.
  • several, preferably two inclinometers are usually provided in perpendicular measuring planes oriented at right angles to one another in order to control the hydraulically actuated adjusting cylinders of the control strips. Their measured values not only supply the input variables of the built-in automatic control strip adjustment, but are also transmitted to a control station arranged at the mouth of the borehole with the telemetric device.
  • This telemetric device works with electrical signals, which are either towed cables or conductors housed in the holes.
  • the signals transmitted in this way are sufficiently precise because a power source that is independent of the flushing current is used to generate and transmit them, which supplies the signal energy and can drive the pressure generator, provided that the latter does not directly receive its kinetic energy from the rotating inner tube.
  • a battery can also be used as the current source, it is preferably a generator whose rotor is driven by the rotating inner tube.
  • the conductor connection required for the transmission of the signals has a disadvantageous effect.
  • the connection is electrically perfect, but is subject to all mechanical and other stresses caused by the rotating drill pipe, the borehole joints and the borehole irrigation.
  • a drill drill designed as a drill collar which is designed as a rotating drill pipe.
  • the purge stream running through the purge channel and a hydraulic converter, which converts the electrical signals into pressure pulses of the purge, serve as the telemetric device.
  • the flushing flow pressure-modulated in this way can be carried out at the drill hole output are measured, whereby the pressure pulses can be received by a receiver and converted into electrical quantities for transmission.
  • a tube valve in the drill collar serves as a converter for the pressure modulation of the flushing stream, which throttles the flushing stream and is actuated with the aid of an integrated, self-contained hydraulic circuit.
  • the hydraulic working medium is controlled by means of a solenoid valve that is subjected to the electrical inclination data.
  • Such a telemetric device requires an axial arrangement of the pipe valve, ie the valve body concentrically in a flushing channel, which guides the flushing past the throttle point past the pipe valve.
  • this results in a spatial problem, namely when the drill pipe having the irrigation channel is relatively thin-walled. This is especially the case when it is the inner tube of a target boring bar that has a standing outer tube.
  • a standing outer tube cannot be realized with correspondingly thick-walled drilling tubes. This requires the generator to be accommodated in the rotating drill pipe and then requires a turbine driven by the flushing to drive the generator.
  • this turbine causes errors in the formation of the electrical signals which are to be transmitted.
  • the pressure signals are uneven, at least but marked flat pressure rise and fall when they are generated and transmitted with the known device. This is disadvantageous because not only does it make the detection of the pressure signals more difficult, but also the signal frequency low, and the accuracy of the data to be transmitted in this way remains limited.
  • the invention is therefore based on the object of designing a device of the type mentioned at the outset such that, in the case of a drill pipe suitable for target drilling, the units provided for driving the throttle valve for protection against the abrasive flushing liquid outside the same in a part of the drill pipe which is less subject to stress, Shock and exposure to drilling is exposed, arranged and the signals generated with the built-in electro-hydraulic device are transmitted with the required accuracy.
  • the invention makes it possible for the first time to combine a target boring bar with a rotating inner tube and a fixed outer tube and a throttle valve arranged in the inner tube.
  • Energy is generated either by a generator that is driven by the rotating inner rod or by an electric motor.
  • the rinsing liquid serves as the transmission medium for the electrical measuring pulses, which is converted into a sequence of pressure pulses by the throttle valve.
  • the pressure pulses received at the mouth of the borehole are converted back into electrical impulses via a transducer and provide information about the condition of the target boring bar and make it possible to correct the drilling direction.
  • This principle is only made possible in a target boring bar corresponding to the basic structure of the target boring bar according to the invention by miniaturizing the transducer, which can therefore be accommodated in the limited spatial conditions, while at the same time ensuring the required form of the pressure pulses.
  • This miniaturization of the transducer is done by moving all parts and assemblies downstream of the throttle valve into the outer tube, while the arrangement and design of the throttle valve can generate pressure pulses that are accessible for precise evaluation.
  • the invention has the advantage that, in addition to the signals supplied by the inclinometers, a large number of further data of the target boring bar can also be transmitted to the outside.
  • the required measuring devices and monitors can be accommodated in the standing and therefore relatively less mechanically stressed outer tube and only the signals they provide after conversion into hydraulic or mechanical impulses Transfer the throttle valve to the purge flow.
  • the throttle valve according to the invention consists of a ring-shaped base body which is connected in a rotationally fixed manner to the inner tube, the upstream end of which is tapered and serves as a valve seat, and a hollow body which is arranged concentrically in the base body and which is connected to the base body via webs and is open on both sides, and in which an axially displaceable resistance body is guided, which is sealed against the hollow body.
  • a drive device in the outer tube actuates the resistance body, which in cooperation with the valve seat varies the flow cross section of the flushing liquid flow.
  • the transmission means for the converted measured values are accommodated in the webs for protection against the abrasive rinsing liquid. Only the resistance body and the webs are exposed to the flushing liquid flow, while all sensitive devices such as. Measuring instruments, transducers, throttle valve drive and the energy supply are either arranged in the outer tube, which is less stressed, or in rooms sealed against the flushing liquid.
  • the resistance body is designed on the inflow side as a streamlined cap that can be displaced in the axial direction on the hollow body and on the downstream side as a streamlined cap that can be displaced in the axial direction in the hollow body.
  • a hydraulic or pneumatic drive can be provided to actuate the throttle valve, in which the resistance body can be actuated through bores in the inner tube and in the webs of the hollow body via a pressure medium supply arranged in the outer tube, the resistance body having two hermetically sealed chambers into which one of the holes opens. If the upstream chamber is supplied with hydraulic or pneumatic pressure medium, the cap pushes against the valve seat and reduces the flow cross-section or completely prevents the flow. The cap sits on the outer circumference of the hollow body.
  • a further embodiment of the invention provides that the resistance body can be actuated by levers which act on the resistance body and are driven by drives arranged in the outer tube.
  • the levers can be designed as fork rockers that can be inserted through the webs and are mounted on the hollow body.
  • the fork rockers actuated by the drive in turn actuate a piston arranged in the hollow body, which displaces the caps in or against the direction of flow.
  • rigid connections between the drive and the resistance body can also be used as levers.
  • a hydraulically or pneumatically operable ring piston is provided as the drive for the levers and is mounted in the outer tube.
  • the lever ends on the drive side are arranged on a rotary bearing, whose fixed part is attached to the ring piston.
  • the lever ends on the drive side can also be actuated electromechanically or electromagnetically, but in addition the resistance body can also be driven directly electromagnetically or electromechanically.
  • a target boring bar is generally provided with the reference number 1 in a broken-off representation. It consists of an outer tube 2 which is fixed in the borehole and which is provided on its outside with control strips, not shown, which are pivotally mounted on the latter and which are supported on the joints of the borehole and via hydraulically Actuatable cylinders can be adjusted individually to correct the direction of the drill pipe.
  • An inner tube 3 is rotatably mounted in the outer tube 2. Connected in a rotationally fixed manner to the inner tube 3, a throttle valve, generally designated 4, is arranged concentrically therein.
  • the throttle valve 4 consists of an annular base body 5, in which a hollow body 6 is concentrically attached, which is connected to the base body 5 via webs 7 and 8.
  • the webs 7 and 8 are hollow on the inside and are aligned with openings 9 and 10 in the inner tube 3.
  • the openings 9 and 10 open into chambers 11 which are guided in a ring around the inner tube 3 in the outer tube 2.
  • the base body 5 is open on both sides, one side 12 being tapered.
  • the hollow body 6 is also open on both sides.
  • the hollow body 6 has a further cap 16, which, however, is guided as a piston in the cylinder formed by the end of the hollow body and is sealed against the hollow body 6 with ring seals 17 and 18.
  • the caps 13 and 16 are connected to a rod 19. Where the rod 19 passes the web area, the ends 20 and 21 on the driven side are engaged by levers designed as rocker arms 22 and 23 on the rod 19.
  • the fork rockers 22 and 23 are rotatably mounted on the base body 5.
  • the drive side Ends 24 and 25 of the fork rockers 22 and 23 are fastened to pins 26.
  • the pins 26 are arranged on a ring 27 which is guided around the inner tube 3 and rotatably mounted on rotary bearings 28 which are fastened to an annular piston 29.
  • the annular piston 29 can only be displaced in the axial direction.
  • the annular piston 29 is acted upon by pressure medium, for example via pressure medium channels 30 and 31.
  • the annular piston and the pressure medium channels are sealed against the outer tube 2. If the annular piston 29 is displaced in the annular space 11 in one direction, the fork rockers 22 and 23 move the rod 19 in the opposite direction.
  • the rod 19, on which the caps 13 and 16 are arranged thus displaces the caps 13 and 16 either in the direction of the tapered opening 12 of the base body 5, in the extreme case the cap 13 resting on the edge of the opening 12.
  • the opening 12 opens into the flushing liquid channel 35, which leads the flushing liquid from the hole mouth, not shown, to the drill bit, also not shown.
  • the rinsing liquid flows towards the cap 13, past it, the hollow body 6 and the cap 16, to the drill bit.
  • the actuation of the annular piston 29 leads to move the caps 13 and 16 and thus to change the cross-section of the flushing liquid cross-section.
  • pressure pulses are transmitted to the flushing liquid stream, which are collected and processed by suitable instruments at the mouth of the borehole.
  • the annular space 11 is accessible via the cover 36 for installing the fork rockers and for maintenance work.
  • FIGS. 2 and 3 show a further embodiment of the device according to the invention, the same parts as in FIG. 1 being provided with the same reference numerals.
  • the caps 13 and 16 are actuated hydraulically or pneumatically.
  • a ring piston therefore unfolds as well as the fork rockers.
  • channels 40 and 41 and 42 and 43 are provided in the webs, which are aligned with channels 44 to 47 in the inner tube 3.
  • the channels 40 to 47 are acted upon by a pressure medium supply, not shown, in the outer tube 2.
  • the channels 40 to 43 open into two separate chambers 48 and 49 in the hollow body 6.
  • the pressure medium flows into the chambers 48 or 49 and thus presses either the cap 13 to the opening 12 or the cap 16 opposite opening of the base body 5, resulting in the above-mentioned pressure pulse generation in the liquid flow.
  • the flow resistance body (caps 13 and 16 and hollow body 6) is hydrostatically pressure-compensated and does not experience any axial displacement due to the external pressure forces.
  • Ie The system is over w3 ⁇ w2 ⁇ w1 and d12 - d22 d32 taking into account the flow losses from shape, surface and flow state change hydrodynamically partial pressure compensated and partly force compensated (axial).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Geophysics (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Earth Drilling (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measuring Fluid Pressure (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

A choker valve assembly for a drill string is provided for transmitting information measured in an underground bore hole by sensing devices, to the surface by modulating the pressure of the flushing fluid. The valve assembly includes a housing that is non-rotatably connected within the flushing fluid flow passage by cross-pieces extending between the housing and a portion of the inner pipe wall. A drag body valve element is mounted by the housing and is axially displaceable with respect to a tapered restriction portion of the inner pipe. Drive means for displacing the valve element is located outside the housing and extends between the valve element and the pipe wall through the cross-pieces. A cap is provided on each end of the valve element. The cap facing the direction of flushing fluid flow extends beyond the perimeter of the housing and the cap facing away from the direction of flushing fluid flow is entirely within the perimeter of the housing to provide a hydrodynamically pressure-compensated choker valve assembly.

Description

Die Erfindung betrifft eine Vorrichtung, insbe­sondere für den Einsatz unter Tage zur Fernüber­tragung von Informationen aus einem Bohrloch gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device, in particular for use underground for the remote transmission of information from a borehole according to the preamble of claim 1.

Eine derartige Vorrichtung ist aus der DE-PS 30 28 813 bekannt. Zur Druckpulserzeugung ist dabei ein Drosselventil im Bohrgestänge so angeordnet, daß die Spülflüssigkeit dieses an­und umströmt. Alle zum Antrieb des Drosselventils notwendigen Einrichtungen bilden mit dem Drossel­ventil eine Baueinheit. Sie werden über Kanäle mit Energie versorgt, die durch Stege geführt sind, welche das Drosselventil mit der Bohrrohrwandung verbinden, und in der Spülmittelströmung liegen. Die Spülflüssigkeit treibt bei derartigen Bohrge­stängen wie aus der DE-PS 21 61 353 bekannt, in der Regel über eine Turbine den Bohrmeißel an. Da die Spülflüssigkeit jedoch mit Feinmaterial wie Bohr­klein versetzt ist, sind die Stege und die Turbine einer sehr abrasiven Strömung ausgesetzt, die schnell zur Zerstörung derselben führt. Wird auf den Einsatz einer Turbine verzichtet, wird also das Bohrgestänge selbst als Antrieb für die Bohrkrone benutzt, so sind die Antriebsaggregate für das Drosselventil sowie die Übertragungselemente für die Signale von den Meßinstrumenten zum Drosselventil durch die Bohr­tätigkeit und die Drehbewegung starken Belastungen ausgesetzt.Such a device is known from DE-PS 30 28 813. To generate pressure pulses, a throttle valve is arranged in the drill pipe so that the flushing liquid flows around it. All devices required to drive the throttle valve form a structural unit with the throttle valve. They are supplied with energy via ducts, which are guided through webs which connect the throttle valve to the drill pipe wall and lie in the flushing agent flow. The flushing liquid drives such drill rods as known from DE-PS 21 61 353, usually via a turbine, the drill bit. However, since the flushing liquid is mixed with fine material such as cuttings, the webs and the turbine are exposed to a very abrasive flow, which quickly leads to their destruction. If a turbine is not used, i.e. if the drill pipe itself is used as the drive for the drill bit, the drive units for the throttle valve and the transmission elements for the signals from the measuring instruments to the throttle valve are exposed to heavy loads due to the drilling activity and the rotary movement.

Es ist im Stand der Technik auch bereits die Aus­führungsform eines drehenden Bohrgestänges bekannt, bei der im Bereich des Bohrmeißels ein Innenrohr dreh­ bar in einem feststehenden Außenrohr angeordnet ist. Dieser Teil des Bohrgestänges wird auch Ziel­bohrstange genannt. Allgemein gesehen ist eine Zielbohrstange ein in den Bohrgestängezug einge­bautes Bohrrohr, welches Meßwerte aufnimmt und weitergibt, die von Meßgeräten und Wächtern in der Zielbohrstange stammen. Die Meßwerte geben über den Verlauf der Bohrung, d.h. über etwaige Abweichungen von einer vorgegebenen Bohrlochrichtung Auskunft, während die Wächter Meßwerte liefern, welche die Funktionsüberwachung der verschiedenen Einrichtungen einer solchen Zielbohrstange er­möglichen und welche mit einer Einrichtung zur Korrektur der Bohrung versehen sind. Eine solche Einrichtung besteht in der Regel aus mehreren, am Außenrohr schwenkbar gelagerten Steuerleisten, die sich auf den Stößen des Bohrloches abstützen und iber hydraulisch beaufschlagbare Zylinder einzeln verstellt werden können, um die Richtung des Bohrgestänges zu korrigieren. Eine derartige Zielbohrstange ist z.B. aus der DE-OS 30 00 239.2 bekannt. In das Außenrohr dieser Zielbohrstange sind zur Steuerung der hydraulisch beaufschlag­baren Verstellzylinder der Steuerleisten meistens mehrere, vorzugsweise zwei Neigungsmesser in rechtwinklig zueinander orientierten senkrechten Meßebenen vorgesehen. Deren Meßwerte liefern nicht nur die Eingangsgrößen der eingebauten automatischen Steuerleistenverstellung, sondern werden zu einem am Bohrlochmund angeordneten Steuerstand mit der telemetrischen Einrichtung übertragen. Diese tele­metrische Einrichtung arbeitet mit elektrischen Signalen, welche über entweder in einem Schlepp­ kabel oder in den Bohrungen selbst untergebrachte Leiter übermittelt werden. Die so übermittelten Signale sind ausreichend genau, weil zu ihrer Erzeugurg und Übertragung eine von dem Spülstrom unabhängige Stromquelle dient, welche die Signal­energie liefert und den Druckerzeuger antreiben kann, sofern dieser nicht unmittelbar seine Be­wegungsenergie von dem drehenden Innenrohr erhält. Obwohl als Stromquelle auch eine Batterie in Frage kommt, handelt es sich vorzugsweise um einen Gene­rator, dessen Läufer von dem drehenden Innenrohr angetrieben wird.The embodiment of a rotating drill pipe is also known in the prior art, in which an inner tube rotates in the area of the drill bit bar is arranged in a fixed outer tube. This part of the drill pipe is also called the target drill rod. Generally speaking, a target boring bar is a drill pipe installed in the drill string train, which receives and transmits measured values that originate from measuring devices and monitors in the target boring bar. The measured values provide information about the course of the bore, ie about any deviations from a predetermined direction of the borehole, while the guards provide measured values which enable the function monitoring of the various devices of such a target boring bar and which are provided with a device for correcting the bore. Such a device generally consists of a plurality of control strips pivotally mounted on the outer tube, which are supported on the joints of the borehole and can be individually adjusted via hydraulically actuatable cylinders in order to correct the direction of the drill pipe. Such a target boring bar is known for example from DE-OS 30 00 239.2. In the outer tube of this target boring bar, several, preferably two inclinometers are usually provided in perpendicular measuring planes oriented at right angles to one another in order to control the hydraulically actuated adjusting cylinders of the control strips. Their measured values not only supply the input variables of the built-in automatic control strip adjustment, but are also transmitted to a control station arranged at the mouth of the borehole with the telemetric device. This telemetric device works with electrical signals, which are either towed cables or conductors housed in the holes. The signals transmitted in this way are sufficiently precise because a power source that is independent of the flushing current is used to generate and transmit them, which supplies the signal energy and can drive the pressure generator, provided that the latter does not directly receive its kinetic energy from the rotating inner tube. Although a battery can also be used as the current source, it is preferably a generator whose rotor is driven by the rotating inner tube.

Nachteilig wirkt sich jedoch die für die Über­tragung der Signale erforderliche Leiterverbindung aus. Wenn sie im Bohrgestänge untergebracht wird, ist die Herstellung und Aufrechterhaltung einwand­freier Kontaktverbindungen zwischen den Bohrrohren schwierig. Bedient sich die telemetrische Ein­richtung eines Schleppkabels, so ist die Ver­bindung zwar elektrisch einwandfrei, unterliegt aber allen mechanischen und sonstigen Beanspruchungen durch das drehende Bohrgestänge, die Bohrlochstöße und die Bohrlochspülung.However, the conductor connection required for the transmission of the signals has a disadvantageous effect. When placed in the drill string, it is difficult to make and maintain proper contact between the drill pipes. If the telemetric device uses a trailing cable, the connection is electrically perfect, but is subject to all mechanical and other stresses caused by the rotating drill pipe, the borehole joints and the borehole irrigation.

Weiterhin ist aus der DE-OS 29 41 102 eine als Schwerstange ausgebildete Zielbohrstange bekannt, welche als drehendes Bohrrohr ausgeführt ist. Hier­bei dient als telemetrische Einrichtung der durch den Spülkanal verlaufende Spülstrom und ein hy­draulischer Wandler, welcher die elektrischen Signale in Druckimpulse der Spülung umsetzt. Der so druckmodulierte Spülstrom kann am Bohr­ lochausgang vermessen werden, wodurch sich die Druckimpulse von einem Empfänger aufnehmen und zur Weiterleitung in elektrische Größen umwandeln lassen. Als Wandler für die Druckmodulation des Spülstromes dient in der Schwerstange ein Rohr­ventil, daß den Spülstrom drosselt und mit Hilfe eines eingebauten, in sich geschlossenen hydraulischen Kreises betätigt wird. Die Steuerung des hydraulischen Arbeitsmediums geschieht mit Hilfe eines Magnet­ventils, daß mit den elektrischen Neigungsdaten beaufschlagt wird.Furthermore, from DE-OS 29 41 102 a drill drill designed as a drill collar is known, which is designed as a rotating drill pipe. The purge stream running through the purge channel and a hydraulic converter, which converts the electrical signals into pressure pulses of the purge, serve as the telemetric device. The flushing flow pressure-modulated in this way can be carried out at the drill hole output are measured, whereby the pressure pulses can be received by a receiver and converted into electrical quantities for transmission. A tube valve in the drill collar serves as a converter for the pressure modulation of the flushing stream, which throttles the flushing stream and is actuated with the aid of an integrated, self-contained hydraulic circuit. The hydraulic working medium is controlled by means of a solenoid valve that is subjected to the electrical inclination data.

Eine solche telemetrische Einrichtung setzt eine axiale Anordnung des Rohrventils, d.h. des Ventil­körpers konzentrisch in einem Spülkanal voraus, der die Spülung hinter der Drosselstelle an dem Rohrventil vorbeileitet. Einerseits ergibt sich hieraus ein räumliches Problem, wenn nämlich das den Spülkanal aufweisende Bohrrohr verhältnismäßig dünnwandig ist. Das ist insbesondere dann der Fall, wenn es sich um das Innenrohr einer Zielbohrstange handelt, die ein stehendes Außenrohr aufweist. Andererseits kann aber bei entsprechend dickwandigen Bohrrohren ein stehendes Außenrohr nicht verwirklicht werden. Das bedingt die Unter­bringung des Stromerzeugers in dem drehenden Bohr­rohr und setzt dann für den Antrieb des Generators eine von der Spülung angetriebene Turbine voraus. Diese Turbine verursacht wegen des druckmodulierten Spülstromes und andere, den Spülstrom beeinflussende Größen Fehler der Bildung der elektrischen Signale, die übertragen werden sollen. Im Ergebnis sind die Drucksignale durch einen ungleichmäßigen, jedenfalls aber flachen Druckanstieg und -abfall gekenn­zeichnet, wenn sie mit der bekannten Einrichtung erzeugt und übermittelt werden. Das ist nachteilig, weil dadurch nicht nur das Erkennen der Druck­signale erschwert wird, sondern auch die Signal­frequenz gering und dadurch die Genauigkeit der auf diese Weise zu übermittelnden Daten beschränkt bleibt.Such a telemetric device requires an axial arrangement of the pipe valve, ie the valve body concentrically in a flushing channel, which guides the flushing past the throttle point past the pipe valve. On the one hand, this results in a spatial problem, namely when the drill pipe having the irrigation channel is relatively thin-walled. This is especially the case when it is the inner tube of a target boring bar that has a standing outer tube. On the other hand, however, a standing outer tube cannot be realized with correspondingly thick-walled drilling tubes. This requires the generator to be accommodated in the rotating drill pipe and then requires a turbine driven by the flushing to drive the generator. Because of the pressure-modulated flushing current and other variables influencing the flushing current, this turbine causes errors in the formation of the electrical signals which are to be transmitted. As a result, the pressure signals are uneven, at least but marked flat pressure rise and fall when they are generated and transmitted with the known device. This is disadvantageous because not only does it make the detection of the pressure signals more difficult, but also the signal frequency low, and the accuracy of the data to be transmitted in this way remains limited.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art so auszubilden, daß bei einem zur Zielbohrung ge­eigneten Bohrgestänge die zum Antrieb des Drossel­ventils vorgesehenen Aggregate zum Schutz gegen die abrasive Spülflüssigkeit außerhalb derselben in einem Teil des Bohrgestanges, der weniger der Beanspruchung, Erschütterung und Belastung durch die Bohrtätigkeit ausgesetzt ist, angeordnet sind und die mit der eingebauten elektrohydraulischen Einrichtung erzeugten Signale mit der erforderlichen Genauigkeit übermittlet werden.The invention is therefore based on the object of designing a device of the type mentioned at the outset such that, in the case of a drill pipe suitable for target drilling, the units provided for driving the throttle valve for protection against the abrasive flushing liquid outside the same in a part of the drill pipe which is less subject to stress, Shock and exposure to drilling is exposed, arranged and the signals generated with the built-in electro-hydraulic device are transmitted with the required accuracy.

Die Erfindung löst diese Aufgabe mit Hilfe der Merk­male des kennzeichnenden Teils des Anspruchs 1. Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.The invention solves this problem with the aid of the features of the characterizing part of claim 1. Further advantageous refinements of the invention are the subject of the dependent claims.

Die Erfindung ermöglicht es erstmals, eine Ziel­bohrstange mit drehendem Innenrohr und feststehendem Außenrohr und ein im Innenrohr angeordnetes Drossel­ventil miteinander zu kombinieren. Die zur Be­tätigung der an der Zielbohrstange angeordneten Meßinstrumente, der Steuerleisten etc. notwendige Energie wird entweder durch einen Generator erzeugt, der von der drehenden Innenstange angetrieben wird oder durch einen Elektromotor. Als Übertragungsmedium der elektrischen Meß­impulse, welche durch das Drosselventil in eine Folge von Druckpulsen umgewandelt wird, dient die Spülflüssigkeit. Die am Bohrlochmund empfangenen Druckpulse werden über einen Meßwandler wieder in elektrische Impulse umgewandelt und geben Aus­kunft über den Zustand der Zielbohrstange und er­möglichen es, die Bohrrichtung zu korrigieren. Dieses Prinzip wird bei einer dem grundsätzlichen Aufbau der erfindungsgemäßen Zielbohrstange ent­sprechenden Zielbohrstange erst durch die Miniaturisierung des Wandlers ermöglicht, der sich deswegen in den beschränkten räumlichen Verhält­nissen unterbringen läßt, wobei gleichzeitig für die erforderliche Form der Druckimpulse gesorgt wird. Diese Miniaturisierung des Wandlers geschieht durch die Verlegung aller dem Drosselventil nachge­ordneten Teile und Baugruppen in das Außenrohr, während durch die Anordnung und Ausbildung des Drosselventils Druckimpulse erzeugt werden können, die einer genauen Auswertung zugänglich sind. Die Erfindung hat den Vorteil, daß außer den von den Neigungsmessern gelieferten Signalen auch eine Vielzahl von weiteren Daten der Zielbohrstange nach außen übertragen werden kann. Dabei lassen sich die dazu erforderlichen Meßgeräte und Wächter in dem stehenden und daher verhältnismäßig weniger mechanisch belasteten Außenrohr unterbringen und lediglich die von ihnen gelieferten Signale nach Wandlung in hydraulische oder mechanische Impulse für das Drosselventil auf den Spülstrom über­tagen. Das Drosselventil gemäß der Erfindung besteht aus einem ringförmig ausgebildeten, drehfest mit dem Innenrohr verbundenen Grund­körper, dessen anströmseitiges Ende verjüngt ist und als Ventilsitz dient und einem im Grund­körper konzentrisch angeordneten Hohlkörper, welcher über Stege mit dem Grundkörper ver­bunden und beidseitig offen ist, und in dem ein axial verschiebbarer Widerstandskörper ge­führt ist, welcher gegen den Hohlkörper abge­dichtet ist. Eine Antriebseinrichtung im Außenrohr betätigt in Abhängigkeit der Meßwerte den Wider­standskörper, der in Zusammenwirken mit dem Ventil­sitz den Strömungsquerschnitt der Spülflüssigkeits­strömung variiert. Die Übertragungsmittel für die umgewandelten Meßwerte sind dabei zum Schutz gegen die abrasive Spülflüssigkeit in den Stegen unter­gebracht. Einzig und allein der Widerstandskörper und die Stege sind der Spülflüssigkeitsströmung ausgesetzt, während sämtliche empfindlichen Ein­richtungen wie. Meßinstrumente, Wandler, Drossel­ventilantrieb und die Energieversorgung entweder im weniger stark beanspruchten Außenrohr angeordnet sind oder in gegen die Spülflüssigkeit abgedichteten Räumen.The invention makes it possible for the first time to combine a target boring bar with a rotating inner tube and a fixed outer tube and a throttle valve arranged in the inner tube. The necessary to operate the measuring instruments arranged on the target boring bar, the control strips, etc. Energy is generated either by a generator that is driven by the rotating inner rod or by an electric motor. The rinsing liquid serves as the transmission medium for the electrical measuring pulses, which is converted into a sequence of pressure pulses by the throttle valve. The pressure pulses received at the mouth of the borehole are converted back into electrical impulses via a transducer and provide information about the condition of the target boring bar and make it possible to correct the drilling direction. This principle is only made possible in a target boring bar corresponding to the basic structure of the target boring bar according to the invention by miniaturizing the transducer, which can therefore be accommodated in the limited spatial conditions, while at the same time ensuring the required form of the pressure pulses. This miniaturization of the transducer is done by moving all parts and assemblies downstream of the throttle valve into the outer tube, while the arrangement and design of the throttle valve can generate pressure pulses that are accessible for precise evaluation. The invention has the advantage that, in addition to the signals supplied by the inclinometers, a large number of further data of the target boring bar can also be transmitted to the outside. The required measuring devices and monitors can be accommodated in the standing and therefore relatively less mechanically stressed outer tube and only the signals they provide after conversion into hydraulic or mechanical impulses Transfer the throttle valve to the purge flow. The throttle valve according to the invention consists of a ring-shaped base body which is connected in a rotationally fixed manner to the inner tube, the upstream end of which is tapered and serves as a valve seat, and a hollow body which is arranged concentrically in the base body and which is connected to the base body via webs and is open on both sides, and in which an axially displaceable resistance body is guided, which is sealed against the hollow body. Depending on the measured values, a drive device in the outer tube actuates the resistance body, which in cooperation with the valve seat varies the flow cross section of the flushing liquid flow. The transmission means for the converted measured values are accommodated in the webs for protection against the abrasive rinsing liquid. Only the resistance body and the webs are exposed to the flushing liquid flow, while all sensitive devices such as. Measuring instruments, transducers, throttle valve drive and the energy supply are either arranged in the outer tube, which is less stressed, or in rooms sealed against the flushing liquid.

Vorteilhafterweise ist der Widerstandskörper an­strömseitig als eine auf dem Hohlkörper in axialer Richtung verschiebbare stromlinienförmige Kappe und abströmseitig als im Hohlkörper in axialer Richtung verschiebbare stromlinienförmige Kappe ausgebildet. Hierdurch wird der abrasiven Strömung ein möglichst geringer Widerstand entgegengesetzt. Zur Be­tätigung des Drosselventils kann ein hydraulischer bzw. pneumatischer Antrieb vorgesehen sein, in dem der Widerstandskörper durch Bohrungen im Innenrohr und in den Stegen des Hohlkörpers über eine im Außenrohr angeordnete Druckmittelversorgung betätigbar ist, wobei der Widerstandskörper über zwei hermetisch gegeneinander abgedichtete Kammern verfügt, in die je eine der Bohrungen mündet. Wird die anströmseitige Kammer mit hydraulischem bzw. pneumatischem Druckmittel versorgt, so schiebt sich die Kappe gegen den Ventilsitz und verringert den Strömungsquerschnitt bzw. unterbindet die Strömung ganz. Die Kappe sitzt auf dem Außenumfang des Hohlkörpers.Advantageously, the resistance body is designed on the inflow side as a streamlined cap that can be displaced in the axial direction on the hollow body and on the downstream side as a streamlined cap that can be displaced in the axial direction in the hollow body. This makes the abrasive flow as possible low resistance opposed. A hydraulic or pneumatic drive can be provided to actuate the throttle valve, in which the resistance body can be actuated through bores in the inner tube and in the webs of the hollow body via a pressure medium supply arranged in the outer tube, the resistance body having two hermetically sealed chambers into which one of the holes opens. If the upstream chamber is supplied with hydraulic or pneumatic pressure medium, the cap pushes against the valve seat and reduces the flow cross-section or completely prevents the flow. The cap sits on the outer circumference of the hollow body.

Eine weitere Ausführungsform der Erfindung sieht vor, daß der WiderstandskörperdurchHebel betätigbar ist, die am Widerstandskörper angreifen und durch im Außenrohr angeordnete Antriebe angetrieben sind. Dabei können die Hebel als Gabelwippen ausgebildet sein, die durch die Stege einsetzbar und am Hohl­körper gelagert sind. Die durch den Antrieb be­tätigten Gabelwippen betätigen ihrerseits einen im Hohlkörper angeordneten Kolben, der die Kappen in oder entgegen der Strömungsrichtung verschiebt. Statt der Gabelwippen können als Hebel auch starre Verbindungen zwischen dem Antrieb und dem Wider­standskörper verwendet werden. Als Antrieb für die Hebel ist ein hydraulisch bzw. pneumatisch betreibbarer Ringkolben vorgesehen, der im Außen­rohr gelagert ist. Dabei sind die antriebsseitigen Hebelenden an einem Rotationslager angeordnet, dessen feststehender Teil am Ringkolben befestigt ist. Die antriebsseitigen Hebelenden können jedoch auch elektromechanisch bzw. elektromagnetisch be­tätigt werden, darüber hinaus kann der Widerstands­körper jedoch auch direkt elektromagnetisch bzw. elektromechanisch angetrieben sein.A further embodiment of the invention provides that the resistance body can be actuated by levers which act on the resistance body and are driven by drives arranged in the outer tube. The levers can be designed as fork rockers that can be inserted through the webs and are mounted on the hollow body. The fork rockers actuated by the drive in turn actuate a piston arranged in the hollow body, which displaces the caps in or against the direction of flow. Instead of the fork rockers, rigid connections between the drive and the resistance body can also be used as levers. A hydraulically or pneumatically operable ring piston is provided as the drive for the levers and is mounted in the outer tube. The lever ends on the drive side are arranged on a rotary bearing, whose fixed part is attached to the ring piston. However, the lever ends on the drive side can also be actuated electromechanically or electromagnetically, but in addition the resistance body can also be driven directly electromagnetically or electromechanically.

Ausführungsformen und weitere Vorteile der Erfindung sind im folgenden anhand von Zeichnungen dargestellt und näher erläutert. Es zeigen;

  • Fig. 1 in abgebrochener Darstellung eine Zielbohr­stange mit darin angeordnetem Drosselventil (Hebelbetätigung),
  • Fig. 2 Querschnitt des Drosselventils (druckmittel­betätigt),
  • Fig. 3 in abgebrochener Darstellung Querschnitt durch eine Zielbohrstange mit darin angeordnetem Drosselventil, Draufsicht des Widerstands­körpers (druckmittelbetätigt),
  • Fig. 4 anströmseitige Ansicht des Innenrohres mit darin angeordnetem Drosselventil.
Embodiments and further advantages of the invention are shown below with reference to drawings and explained in more detail. Show it;
  • 1 is a broken view of a target boring bar with throttle valve arranged therein (lever actuation),
  • 2 cross section of the throttle valve (actuated by pressure medium),
  • 3 shows a broken cross-section through a target boring bar with a throttle valve arranged therein, top view of the resistance body (actuated by pressure medium),
  • Fig. 4 upstream view of the inner tube with a throttle valve arranged therein.

In der Zeichnung Figur 1 ist in abgebrochener Dar­stellung eine Zielbohrstange allgemein mit dem Be­zugszeichen 1 versehen. Sie besteht aus einem im Bohr­loch feststehenden Außenrohr 2, welches auf seiner Außenseite mit schwenkbar an diesem gelagerten, nicht dargestellten Steuerleisten versehen ist, die sich auf den Stößen des Bohrloches abstützen und über hydraulisch beaufschlagbare Zylinder einzeln verstellt werden können, um die Richtung des Bohrgestänges zu korrigieren. Drehbar im Außenrohr 2 ist ein Innenrohr 3 gelagert. Drehfest mit dem Innen­rohr 3 verbunden ist konzentrisch in diesem ein allgemein mit 4 bezeichnetes Drosselventil ange­ordnet. Das Drosselventil 4 besteht aus einem ringförmigen Grundkörper 5, in dem konzentrisch ein Hohlkörper 6 angebracht ist, der über Stege 7 und 8 mit dem Grundkörper 5 verbunden ist. Die Stege 7 und 8 sind innen hohl ausgebildet und fluchten mit Öffnungen 9 und 10 im Innenrohr 3. Die Öffnungen 9 und 10 münden in Kammern 11, die ringförmig um das Innenrohr 3 im Außenrohr 2 herum­geführt sind. Der Grundkörper 5 ist beidseitig offen, wobei eine Seite 12 verjüngt ausgebildet ist. Auch der Hohlkörper 6 ist beidseitig offen. Auf dem Außenumfang des Hohlkörpers 6 und zwar an seinem der verjüngten Seite 12 des Grundkörpers 5 zuge­wandten Ende ist eine stromlinienförmige Kappe 13 verschiebbar gelagert und mit Ringdichtungen 14 und 15 gegen den Hohlkörper abgedichtet. An seinem anderen Ende verfügt der Hohlkörper 6 über eine weitere Kappe 16, die jedoch in dem durch das Hohlkörperende gebildeten Zylinder als Kolben ge­führt und mit Ringdichtungen 17 und 18 gegen den Hohlkörper 6 abgedichtet ist. Die Kappen 13 und 16 sind mit einer Stange 19 verbunden. Dort, wo die Stange 19 den Stegbereich passiert, greifen die abtriebsseitigen Enden 20 und 21 von als Gabelwippen 22 und 23 ausgebildeten Hebeln an der Stange 19 an. Die Gabelwippen 22 und 23 sind am Grundkörper 5 drehbar gelagert. Die antriebbseitigen Enden 24 und 25 der Gabelwippen 22 und 23 sind an Zapfen 26 befestigt. Die Zapfen 26 sind an einem Ring 27 angeordnet, der um das Innenrohr 3 herumgeführt ist und drehbar an Rotationslagern 28 gelagert, die an einem Ringkolben 29 befestigt sind. Der Ringkolben 29 ist lediglich in axialer Richtung verschiebbar. Der Ringkolben 29 wird z.B. über Druckmittelkanäle 30 und 31 mit Druckmittel beaufschlagt. Mit Hilfe der Dichtungen 32, 33 und 34 sind der Ringkolben und die Druckmittelkanäle gegen das Außenrohr 2 abgedichet. Wird der Ringkolben 29 im Ringraum 11 in eine Richtung verschoben, so verschieben die Gabelwippen 22 und 23 die Stange 19 in die ent­gegengesetzte Richtung. Die Stange 19, an der die Kappen 13 und 16 angeordnet sind, verschiebt somit die Kappen 13 und 16 entweder in Richtung auf die verjüngte Öffnung 12 des Grundkörpers 5, wobei im Extremfall die Kappe 13 auf den Rand der Öffnung 12 aufliegt. Die Öffnung 12 mündet im Spülflüssigkeitskanal 35, der Spülflüssigkeit vom nicht dargestellten Bohrlochmund zur eben­falls nicht dargestellten Bohrkrone führt. Die Spülflüssigkeit strömt auf die Kappe 13 zu, an dieser, dem Hohlkörper 6 und der Kappe 16 vorbei, zur Bohrkrone. Nicht dargestellte Meßinstrumente im Außenrohr 2, die Meßwerte über den Zustand der Zielbohrstange und deren Richtung aufnehmen, geben diese an einen ebenfalls nicht dargestellten Wandler im Außenrohr 2 weiter, der die elektrischen Impulse in hydraulische Impulse umwandelt, die über die Kanäle 30 und 31 den Ringkolben 29 be­tätigen. Die Betätigung des Ringkolbens 29 führt zur Verschiebung der Kappen 13 und 16 und somit zu Querschnittsveränderungen des Spül­flüssigkeitsquerschnitts. Hierdurch werden Druckpulse auf den Spülflüssigkeitsstrom über­tragen, die durch geeignete Instrumente am Bohrlochmund aufgefangen und weiterverarbeitet werden. Zum Einbau der Gabelwippen und für Wartungsarbeiten ist der Ringraum 11 über Deckel 36 zugänglich.In the drawing in FIG. 1, a target boring bar is generally provided with the reference number 1 in a broken-off representation. It consists of an outer tube 2 which is fixed in the borehole and which is provided on its outside with control strips, not shown, which are pivotally mounted on the latter and which are supported on the joints of the borehole and via hydraulically Actuatable cylinders can be adjusted individually to correct the direction of the drill pipe. An inner tube 3 is rotatably mounted in the outer tube 2. Connected in a rotationally fixed manner to the inner tube 3, a throttle valve, generally designated 4, is arranged concentrically therein. The throttle valve 4 consists of an annular base body 5, in which a hollow body 6 is concentrically attached, which is connected to the base body 5 via webs 7 and 8. The webs 7 and 8 are hollow on the inside and are aligned with openings 9 and 10 in the inner tube 3. The openings 9 and 10 open into chambers 11 which are guided in a ring around the inner tube 3 in the outer tube 2. The base body 5 is open on both sides, one side 12 being tapered. The hollow body 6 is also open on both sides. On the outer circumference of the hollow body 6, namely at its end facing the tapered side 12 of the base body 5, a streamlined cap 13 is slidably mounted and sealed with ring seals 14 and 15 against the hollow body. At its other end, the hollow body 6 has a further cap 16, which, however, is guided as a piston in the cylinder formed by the end of the hollow body and is sealed against the hollow body 6 with ring seals 17 and 18. The caps 13 and 16 are connected to a rod 19. Where the rod 19 passes the web area, the ends 20 and 21 on the driven side are engaged by levers designed as rocker arms 22 and 23 on the rod 19. The fork rockers 22 and 23 are rotatably mounted on the base body 5. The drive side Ends 24 and 25 of the fork rockers 22 and 23 are fastened to pins 26. The pins 26 are arranged on a ring 27 which is guided around the inner tube 3 and rotatably mounted on rotary bearings 28 which are fastened to an annular piston 29. The annular piston 29 can only be displaced in the axial direction. The annular piston 29 is acted upon by pressure medium, for example via pressure medium channels 30 and 31. With the help of seals 32, 33 and 34, the annular piston and the pressure medium channels are sealed against the outer tube 2. If the annular piston 29 is displaced in the annular space 11 in one direction, the fork rockers 22 and 23 move the rod 19 in the opposite direction. The rod 19, on which the caps 13 and 16 are arranged, thus displaces the caps 13 and 16 either in the direction of the tapered opening 12 of the base body 5, in the extreme case the cap 13 resting on the edge of the opening 12. The opening 12 opens into the flushing liquid channel 35, which leads the flushing liquid from the hole mouth, not shown, to the drill bit, also not shown. The rinsing liquid flows towards the cap 13, past it, the hollow body 6 and the cap 16, to the drill bit. Measuring instruments, not shown, in the outer tube 2, which record measured values about the state of the target boring bar and its direction, pass this on to a converter, also not shown, in the outer tube 2, which converts the electrical pulses into hydraulic pulses, which via the channels 30 and 31 the ring piston Press 29. The actuation of the annular piston 29 leads to move the caps 13 and 16 and thus to change the cross-section of the flushing liquid cross-section. As a result, pressure pulses are transmitted to the flushing liquid stream, which are collected and processed by suitable instruments at the mouth of the borehole. The annular space 11 is accessible via the cover 36 for installing the fork rockers and for maintenance work.

In den Figuren 2 und 3 ist eine weitere Aus­führungsform der erfindungsgemäßen Vorrichtung dargestellt, wobei gleiche Teile wie in Figur 1 mit denselben Bezugszeichen versehen sind. Im Unterschied zum Drosselventil gemäß Figur 1 werden die Kappen 13 und 16 hydraulisch bzw. pneumatisch betätigt. Ein Ringkolben entfältt daher, ebensowie die Gabelwippen. Dafür sind in den Stegen Kanäle 40 und 41 sowie 42 und 43 vorgesehen, die mit Kanälen 44 bis 47 im Innen­rohr 3 fluchten. Die Kanäle 40 bis 47 werden von einer nicht dargestellten Druckmittelver­sorgung im Außenrohr 2 beaufschlagt. Die Kanäle 40 bis 43 münden in zwei voneinander getrennten Kammern 48 und 49 im Hohlkörper 6. Das Druck­mittelströmt je nach gewünschter Verschiebe­richtung der Kappen 13 und 16 in die Kammern 48 oder 49 und drückt somit entweder die Kappe 13 zur Öffnung 12 oder die Kappe 16 zur ent­gegengesetzten Öffnung des Grundkörpers 5, wodurch sich die oben angesprochene Druckpuls­erzeugung im Flüssigkeitsstrom ergibt. Durch entsprechende Gestaltung der Durchmesserverhält­nisse von d1, d2 und d3 ergibt sich die Möglich­keit der hydrostatischen Druckkompensation.
Ist w1 = w2 = w3 = 0 so ist, abgesehen von der axialen Systemausdehnung (statisches Druckgefälle)
p1 = p2 = p3
und über
d1² - d2²

Figure imgb0001
d3²
ist durch die äußere Strömung (w = 0)
v1 = v2 = 0.FIGS. 2 and 3 show a further embodiment of the device according to the invention, the same parts as in FIG. 1 being provided with the same reference numerals. In contrast to the throttle valve according to FIG. 1, the caps 13 and 16 are actuated hydraulically or pneumatically. A ring piston therefore unfolds as well as the fork rockers. For this purpose, channels 40 and 41 and 42 and 43 are provided in the webs, which are aligned with channels 44 to 47 in the inner tube 3. The channels 40 to 47 are acted upon by a pressure medium supply, not shown, in the outer tube 2. The channels 40 to 43 open into two separate chambers 48 and 49 in the hollow body 6. Depending on the desired direction of displacement of the caps 13 and 16, the pressure medium flows into the chambers 48 or 49 and thus presses either the cap 13 to the opening 12 or the cap 16 opposite opening of the base body 5, resulting in the above-mentioned pressure pulse generation in the liquid flow. By Appropriate design of the diameter ratios of d1, d2 and d3 results in the possibility of hydrostatic pressure compensation.
If w1 = w2 = w3 = 0 then, apart from the axial system expansion (static pressure drop)
p1 = p2 = p3
and over
d1² - d2²
Figure imgb0001
d3²
is due to the external flow (w = 0)
v1 = v2 = 0.

Das heißt: Der Strömungswiderstandskörper (Kappen 13 und 16 und Hohlkörper 6) ist hydrostatisch druckkompensiert und erfährt keine Axialver­schiebung durch die äußeren Druckkräfte.This means that the flow resistance body (caps 13 and 16 and hollow body 6) is hydrostatically pressure-compensated and does not experience any axial displacement due to the external pressure forces.

Ist w1 ≠ w2 ≠ w3 dann ist über die Energiegleichung von Bernulli
p1 ≠ p2 ≠ p3.If w1 ≠ w2 ≠ w3 then it is about Bernulli's energy equation
p1 ≠ p2 ≠ p3.

D.h.: Das System areitet über
w3 < w2 < w1 und d1² - d2²

Figure imgb0002
d3²
unter Berücksichtigung der Strömungsverluste aus Form, Oberfläche und Strömungszustandsänderung hydrodynamisch teildruckkompensiert und teilweise kraftkompensiert (axial).Ie: The system is over
w3 <w2 <w1 and d1² - d2²
Figure imgb0002
d3²
taking into account the flow losses from shape, surface and flow state change hydrodynamically partial pressure compensated and partly force compensated (axial).

Claims (10)

1. Vorrichtung, insbesondere für den Einsatz unter Tage, zur Fernübertragung von Informationen aus einem Bohrloch während des Betriebes eines Bohr­gerätes, das einen Bohrmeißel, einen Bohrrohr­strang und eine Spülflüssigkeit im Bohrrohrstrang umfaßt, bestehend aus dem Bohrrohrstrang zuge­ordneten Meßgeräten zur Ermittlung gewunschter Informationsdaten, einem Wandler zum Umwandeln der Informationsdaten in eine kodierte Folge von Signalen, einem in Höhe eines Geberbereiches des Bohrrohrstranges in der Strömung der Spülflüssig­keit angeordneten, den Strömungsquerschnitt für die Spülflüssigkeit beherrschenden, in axialer Richtung des Bohrrohrstranges verschieblich ange­ordnetes Drosselventil, durch das der Druck der Spülflüssigkeit im Bohrstrang veränderbar ist, einen in Abhängigkeit von den Signalen des Wandlers steuerbaren Antrieb für Öffnungs- und Schließbewegungen des Drosselventils sowie einem am Bohrlochmund angeordneten Meßwandler zum Messen des Drucks der Spülflüssigkeit und zum Rückwandeln der aufgenommenen Druckpulsfolgen in auswertbare Informationsdaten, wobei das Drosselventil mit einer die auf sie einwirkenden hydraulischen Drücke kompen­sierenden Ausgleichsvorrichtung versehen ist, dadurch gekennzeichnet, daß das Bohrgerät in bekannter Weise im Bereich des Bohrmeißels über eine Zielbohrstange (1) verfügt, bei der ein von einem Bohrgestänge angetriebenes Innenrohr (3) konzentrisch in einem stehenden Außen­rohr (2) angeordnet ist, welches für einen in der Zielbohrstange (1) untergebrachten Steuerkreis einen Druckerzeuger aufweist, dessen beweglicher Teil von dem Innenrohr (3) gebildet oder von einem Elektromotor angetrieben ist, dessen Antrieb von dem Innenrohr (3) abgeleitet ist, wobei die Meßwerte von im Außenrohr (2) untergebrachten Meßgeräten über die Spülflüssigkeit aus dem Bohrloch auf den Meßwandler übermittelt werden und daß der zur Betätigung des Drosselventils (4) vorgesehene Antrieb im Außenrohr (2) angeordnet ist, wobei das Drosselventil (4) aus einem ring­förmig ausgebildeten, drehfest mit dem Innenrohr (3) verdundenen Grundkörper (5) besteht, dessen anströmseitiges Ende (12) verjüngt ist und als Ventilsitz dient, und einem in Grundkörper (5) konzentrisch angeordneten Hohlkörper (6), welcher über Stege (7, 8) mit dem Grundkörper (5) ver­bunden und beidseitig offen ist, und in dem ein axial verschiebbarer Widerstandskörper (13, 16) geführt ist welcher gegen den Hohlkörper (6) abgedichtet ist.1.Device, in particular for use underground, for the remote transmission of information from a borehole during the operation of a drilling rig, which comprises a drill bit, a drill pipe string and a flushing liquid in the drill pipe string, consisting of measuring devices associated with the drill pipe string for determining desired information data, a converter for converting the information data into a coded sequence of signals, a throttle valve arranged in the flow of the drilling fluid at a sensor area of the drill pipe string and controlling the flow cross section for the drilling liquid, arranged in the axial direction of the drill pipe string, by means of which the pressure of the drilling fluid in the drill string can be changed is a drive that can be controlled as a function of the signals of the converter for opening and closing movements of the throttle valve and a measuring transducer arranged on the mouth of the borehole for measuring the pressure of the flushing liquid and for the back wall punching of the recorded pressure pulse sequences in evaluable information data, wherein the throttle valve is provided with an acting on it hydraulic pressures compensating compensating device, characterized in that the drill has in a known manner in the region of the drill bit via a Zielbohrstange (1), wherein one from a Drill pipe driven inner tube (3) is arranged concentrically in a standing outer tube (2), which for one in the Target boring bar (1) housed control circuit has a pressure generator, the movable part of which is formed by the inner tube (3) or driven by an electric motor, the drive of which is derived from the inner tube (3), the measured values from measuring devices accommodated in the outer tube (2) the flushing liquid is transmitted from the borehole to the transducer and that the drive provided for actuating the throttle valve (4) is arranged in the outer tube (2), the throttle valve (4) consisting of a ring-shaped base body which is twisted in a rotationally fixed manner with the inner tube (3) (5), whose upstream end (12) is tapered and serves as a valve seat, and a hollow body (6) arranged concentrically in the base body (5), which is connected to the base body (5) via webs (7, 8) and is open on both sides and in which an axially displaceable resistance body (13, 16) is guided which is sealed against the hollow body (6). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet daß der Widerstandskörper (13, 16) anströmseitig eine auf den Hohlkörper (6) in axialer Richtung verschiebbare stromlinienförmige Kappe (13) und abströmseitig eine im Hohlkörper (6) in axialer Richtung verschiebbare stromlinienförmige Kappe (16) aufweist.2. Device according to claim 1, characterized in that the resistance body (13, 16) on the inflow side a displaceable on the hollow body (6) in the axial direction streamlined cap (13) and the outflow side a slidable in the hollow body (6) in the axial direction streamlined cap (16 ) having. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet daß der Widerstandskörper (13, 16) durch Bohrungen (40 bis 43; 44 bis 47) im Innenrohr (3) und in den Stegen (7, 8) des Hohlkörpers (6) über eine im Außenrohr (2) angeordnete Druck­mittelversorgung betätigbar ist, wobei der Widerstandskörper (13, 16) über zwei hermetisch gegeneinander abgedichtete Kammern (48, 49) ver­fügt, in die je eine der Bohrungen (40 bis 43) mündet.3. Device according to claim 1 or 2, characterized in that the resistance body (13, 16) can be actuated through bores (40 to 43; 44 to 47) in the inner tube (3) and in the webs (7, 8) of the hollow body (6) via a pressure medium supply arranged in the outer tube (2), wherein the resistance body (13, 16) has two hermetically sealed chambers (48, 49), into each of which one of the bores (40 to 43) opens. 4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Widerstandskörper (13, 16) über Hebel (22, 23) betätigbar ist, die am Widerstandskörper (13, 16) angreifen und durch im Außenrohr (2) ange­ordnete Antriebe (29) angetrieben sind.4. Device according to claim 1 or 2, characterized in that the resistance body (13, 16) can be actuated via a lever (22, 23) arranged on the resistance body (13, 16) engaged by and within the outer tube (2) drives (29 ) are driven. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Hebel (22, 23) als Gabelwippen ausgebildet sind, die durch die Stege (7, 8) einsetzbar und am Hohlkörper (6) gelagert sind.5. The device according to claim 4, characterized in that the levers (22, 23) are designed as fork rockers, which are supported by the webs (7, 8) used and on the hollow body (6). 6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Hebel (22, 23) starre Verbindungen zwischen Antrieb (29) und Widerstandskörper (13, 16) sind.6. The device according to claim 4, characterized in that the levers (22, 23) rigid connections between the drive (29) and resistance bodies (13, 16). 7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Hebel (22, 23) über einen hydraulisch bzw. pneumatisch betriebenen Ringkolben (29) im Außenrohr (2) betätigbar sind, wobei die an­ triebsseitigen Hebelenden an einem Rotationslager (28) angreifen, dessen feststehender Teil am Ring­kolben (29) befestigt ist.7. Device according to one of claims 4 to 6, characterized in that the levers (22, 23) are actuated by means of a hydraulically or pneumatically driven annular piston (29) in the outer tube (2), wherein the at drive end of the lever on a rotary bearing (28), the fixed part of which is attached to the ring piston (29). 8. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die antriebsseitigen Hebelenden elektro­mechanisch betätigbar sind.8. Device according to one of claims 4 to 6, characterized in that the drive-side lever ends are operable electromechanically. 9. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch genkennzeichnet, daß die antriebsseitigen Hebelenden elektro­magnetisch betätigbar sind.9. Device according to one of claims 4 to 6, characterized genkennzeichnet that the drive-side lever ends are operable electromagnetically. 10. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Widerstandskörper (13, 16) direkt elektro­magnetisch bzw. elektromechanisch antreibbar ist.10. The apparatus of claim 1 or 2, characterized in that the resistance body (13, 16) is directly electromagnetically or electromechanically driven.
EP86111862A 1985-08-31 1986-08-27 Down-hole device for transmitting information from a well Expired EP0214554B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111862T ATE48179T1 (en) 1985-08-31 1986-08-27 DEVICE, PARTICULARLY FOR USE UNDERGROUND, FOR REMOTE TRANSMISSION OF INFORMATION FROM A BOREHOLE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3531226 1985-08-31
DE19853531226 DE3531226A1 (en) 1985-08-31 1985-08-31 DEVICE, IN PARTICULAR FOR UNDERGROUND APPLICATION FOR REMOTE TRANSMISSION OF INFORMATION FROM A DRILL HOLE

Publications (3)

Publication Number Publication Date
EP0214554A2 true EP0214554A2 (en) 1987-03-18
EP0214554A3 EP0214554A3 (en) 1987-07-29
EP0214554B1 EP0214554B1 (en) 1989-11-23

Family

ID=6279890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111862A Expired EP0214554B1 (en) 1985-08-31 1986-08-27 Down-hole device for transmitting information from a well

Country Status (10)

Country Link
US (1) US4784229A (en)
EP (1) EP0214554B1 (en)
JP (1) JPS62117984A (en)
AT (1) ATE48179T1 (en)
AU (3) AU6212286A (en)
BR (1) BR8604152A (en)
CA (1) CA1261816A (en)
DE (2) DE3531226A1 (en)
SU (1) SU1642958A3 (en)
ZA (1) ZA866610B (en)

Cited By (2)

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AU651764B2 (en) * 1985-08-31 1994-07-28 Bergwerksverband Gmbh Apparatus, particularly for use under ground, for teletransmission of information from a borehole
CN105573248A (en) * 2016-01-13 2016-05-11 南京航空航天大学 Flexible member assembling dimensional deviation control method based on multi-station assembly jig compensation

Families Citing this family (2)

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DE19607402C1 (en) * 1996-02-28 1997-07-10 Welldone Engineering Gmbh Device for transmitting information within a drill pipe string of a drilling device by means of pressure pulses in a flowing liquid, in particular drilling fluid
US5957221A (en) * 1996-02-28 1999-09-28 Baker Hughes Incorporated Downhole core sampling and testing apparatus

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DE2161353C2 (en) * 1970-12-10 1982-07-08 Société Nationale Elf Aquitaine (Production) S.A., 92400 Courbevoie Device for the transmission of measured values from a borehole by means of the drilling fluid
DE2941102A1 (en) * 1979-10-08 1981-04-16 Dresser Industries, Inc., 75221 Dallas, Tex. Measuring and transmitting apparatus used in drill string - is self-contained and forms output signals modulated into mud flow
DE3000239C2 (en) * 1980-01-05 1983-10-20 Bergwerksverband Gmbh, 4300 Essen Facility for producing targeted holes
DE3028813C2 (en) * 1980-07-30 1983-09-08 Christensen, Inc., 84115 Salt Lake City, Utah Method and device for the remote transmission of information
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EP0134467A2 (en) * 1983-07-19 1985-03-20 Bergwerksverband GmbH Target-directed drilling rod for rotating boring tools with flushing duct for underground mining

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AU651764B2 (en) * 1985-08-31 1994-07-28 Bergwerksverband Gmbh Apparatus, particularly for use under ground, for teletransmission of information from a borehole
CN105573248A (en) * 2016-01-13 2016-05-11 南京航空航天大学 Flexible member assembling dimensional deviation control method based on multi-station assembly jig compensation
CN105573248B (en) * 2016-01-13 2018-01-30 南京航空航天大学 Sheet metal assembly dimensional discrepancy control method based on the compensation of multistation assembling jig

Also Published As

Publication number Publication date
DE3531226C2 (en) 1987-09-24
DE3531226A1 (en) 1987-03-19
AU651764B2 (en) 1994-07-28
EP0214554B1 (en) 1989-11-23
AU5912590A (en) 1990-11-01
EP0214554A3 (en) 1987-07-29
BR8604152A (en) 1987-04-28
CA1261816A (en) 1989-09-26
AU4123393A (en) 1993-08-19
JPS62117984A (en) 1987-05-29
AU6212286A (en) 1987-03-05
US4784229A (en) 1988-11-15
SU1642958A3 (en) 1991-04-15
ZA866610B (en) 1987-05-27
DE3667093D1 (en) 1989-12-28
ATE48179T1 (en) 1989-12-15

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