DE1940087A1 - Wellhead assembly with a tap - Google Patents

Description

DR.ING. F. WUESTHOFF. . - '. "8 M.ÜNCHBN 8O

DIPL. ING. G. PULS 'HATE OF SILENCE 3

·. DRÄr.PEOHMANM _n uroK »3 00 81

DIL ING. D. BBHRBNS

1A-36 664

DESCRIPTION

SHELL IiJTEBIiATXQNALE HESSAECH MAAfSGHAFPIJ N.V. Ben Haag, Netherlands

concerning
Wellhead arrangement with a branch device «

The invention "relates to an employed at the upper end of an oil or gas well equipment and particularly relates to a Bohrloolikopfanordnung _s for attachment to the upper end of a well casing head is suitable and comprises a branching means to Hege averaging the Fludstromes of the bore. This © Abzweigeinriehtung or this distributor valve is also optionally in different positions can be brought to make it accessible either the Bohrloehkopfanordnung for review measures in the vertical direction, barren "to Schäffern a side entrance aur arrangement so that various tools ₉ instruments or other © devices are introduced in circulation into the bore can.

A more recent development in the drilling and equipping of oil and water wells concerns underwater deep wells, in which both the wellhead arrangement and the housing head can be located several hundred feet below the surface of the water at a location remote ^{from the x coast} deep drilling, where Bohrloctekopfanordnung is arranged at a considerable distance below the Wasserobarfläohe were new Terfahran developed "One of these methods can be used ^{as! i} dur © li» »AEIE ~ flowline ^ll -Bohrlochwartungstechnik call" can with this technique

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various well operations such as boutine pre-tests and maintenance work is carried out using tools, pumped into the wellbore through a flow conduit from a remote location such as a coastal storage facility . will · Bach carry out the desired process, such as for example ironing a lohrleitungsstrangung Paraffin, the removal or insertion of a throttle or valve, etc., will be the tool from the Borehole out back through the flow line to the pumped at a remote location

While simple well maintenance operations can be performed by circulating tools down the well through the flow line, the more important reworking procedures require that the wellhead assembly be top-accessible for tool insertion perpendicularly down through the assembly into the well The previously known constructions use branching devices with discharge plugs and a plurality of valves in order to make the arrangement useful ^{either for a vertically accessible mode of operation or for a n} through-the-flow line ^{w mode of operation} the actuation of certain valves must be accomplished through the use of wire or similar tools and this is often a very time consuming operation. There is also the possibility that the plugs or valves may be incorrectly positioned or oriented in the wellhead assembly or even get stuck in it.

Accordingly, the invention is based on the object " a wellhead assembly with a branch groove bu create that the use of wireline or equivalent Tools for dividing!) Makes wrestling superfluous.

• _t

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Another feature of the invention is one Bobrlool & opfiattordsiung old © i & sr Junction device provided $ the one. Comprises valve body, which is optionally between a first position in the "through-the-flow line" Bohrleßfraxbeitsvorgänge can be carried out, and one Evreltess. Position is movable »" when drilling hole & work with eenkxechtsm train & ng dursage can be carried out.

a wellhead arrangement is provided which includes both a rare line for the passage of "fittrcfe-äie-Str8muiigs! ®itiasg ⁿ Warkseugen" and an additional line including vertical access to the interior of the arrangement and the borehole for maintenance purposes and 3! & other dimensions manages. Both of the aforementioned lines are connected to the old interior of a housing Within the arrangement comprising a selectively movable Ableitungsein direction alt a ¥ @ ntilelnrichtung comprises. in a vorbestiesiteß position causes di © ¥ @ ntll®inrichtung a StröteangSBiittelverblnduag swisohea the side line and the line extending into the borehole, while in a bwaitea position the valve establishes a fluid connection between the gusät & lent.

The invention and advantageous details of the acquisition naelifolg @ md aa Haad esaeaatic drawings

as.

1 shows, partly in longitudinal section, an inventive

Bohrloe & kopianortemg on aia © m Bohrloohgehäusekopf ia side view}

. FIG. 2 shows a detail from FIG. 1 in longitudinal section; Fig. 3 is a section along line III-XII in Pig. 2;

Pig. 4 seigt in a partially sectioned plan view another embodiment of the deflector;

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ftf I

■ ■ - 4 - '.' '■ ... ■'. Fig. 5 is a section on the line V-V in Pig. 4th

While the wellhead assembly is described for a well having two suspended production tubing strings, however, the wellhead arrangement can be modified to because it is used for boreholes with only one pipe string or for bores with three or more parallel pipe strings, which are suspended in a borehole housing, can be used

1 is a closure part 11 for a well housing head 13 is provided, which is arranged on an inner inclined seat surface 12 at the upper end of the housing head 13 1st and so tightly closes the housing head 13 against the escape of fluid. Seals shown in perspective can Sirischen of the closure part 11 and the housing head 13 'provided to ensure this seal. The closure part 11 is provided with two vertical lines 14 and 15, ale in the middle and side by side calibrate vertically downward through the closure part 11 extend and in alignment with two strands of production tubing, not shown stand, which are suspended in a known manner in the borehole. For the sake of clarity, can it is assumed that the well casing head 13 and the wellhead assembly in an offshore well and are arranged under water

At the upper end of the closure part 11 for the housing head 13, a main valve 16 is attached, for example, by screws not shown, through which by means of Schllessens the bore can be closed · The valve 16 is preferably Can be operated from a remote point and of the type with full opening, i.e. with a locking part or one Plugs for regulating the flow in the valve are provided, which in the open position have a straight passage through the valve alt a diameter substantially equal to the diameter of the vertical lines 14 and 15 releases. For those here

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described embodiment, the main valve 16 would have two flow channels and have two closure parts, as it is for Shutting off both vertical lines 14 and 15 is provided.

At the top of the main valve 16 is a Y-shaped Branch part 21 with two vertical lines 22 and 23 attached through the main valve 16 with the vertical Lines 14 and 15 is the closure part 11 of the housing head 13 lines

At their upper ends, the vertical lines 22 and 23 of the Y-shaped branch part 21 are in connection with cylindrical housing parts 24 and 25, which are formed in the branch part and receive deflection devices with the valves 26 and 27 shown. With a slight upward curvature, two side lines 28 and 29 extend from the cylindrical housing parts 24 and 25 and lead out through the side wall of the branch part 21. The curvature of the side lines 28 and 29 depends to a certain extent on the length and flexibility of the tools, instruments or other devices which are to be inserted in the circuit downward into the bore through the side lines Radius of curvature of the side lines 28 and 29 are in the order of 1.5 to 3 ^ *

The side lines 28 and 29 are to be connected with splatters 30 or 31 or other coupling devices from Hegelventilea 32 and 33 with the side lines 28 and 29 respectively., Two production flow lines 34 and 35 are connected to the other side of the control valves 32 and 33 connected. The. Flow lines 34 and 35 »leading to the Lead upper end of the wellhead assembly, if necessary bent outwards and down to the sea floor and then for collection or separation on the seabed led to the coast or to a coastal fern storage tank be, lall the © section® of the production air flow system

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34 and 35 are made of metal, they should easily fit into be curved in an arc with a radius no smaller than the radius of curvature that allows objects to be inserted in the circuit through the line into the borehole " It can be seen that regardless of whether the flow lines 34 and 35 are made of solid or flexible material exist, all pipe bends have a minimum radius of curvature must have, which is not smaller than it is necessary for the implementation of objects in the circuit.

Bas the branch part 21 is also with two at a distance from each other arranged vertical bores 36 and 37 provided, which are arranged above the cylindrical housing parts 24 or 25 and are connected therewith. The vertical bores 36 and 37 are in axial alignment with the vertical lines 14 and 15 and have essentially the same inner diameter as the vertical lines 14 and 15

At the upper end of the Y-shaped branch part 21 is a Control valve 38 is provided, which is preferably of the same design as the main valve 16 is and has two through channels with fully opening plugs or shut-off parts. On the control valve 38 is known a vertical Reintroduction line 39 with vertical lines 40 and 41 attached, through the valve 38 with the vertical Bores 36 and 37 are aligned · The right reintroduction line can be suitably sealed liquid, or it can be with a flexible connector be provided, the greater length of the Reintroduction pipe can be turned down to the sea floor

The entire wellhead assembly is preferably surrounded by a liquid-tight housing 41 in order to protect all parts from the corrosive effects of sea water and from the accumulation of marine growth. The valves 16, 26, 2? » 32 _r 33 and 38 can be activated either pneumatically, electrically or hydraulically by a known suitable vent ¹ -.

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system can be operated. In the illustrated execution fox is provided an electrical cable 4-3 sum supplying electrical signals through which a series of electrical actuated control valves 50 to 57 are energized, the flow of a hydraulic pressure medium by electrically driven pumps 58 unfl §9 control. You hydraulic fluid is stored in containers 60 «u & fi 61 ·

Au · Pig · 2 and 3 it is sa @rse! I9 & ₉ that the rotary valves 26 and 27 each have two through bores · The valve 26 has a curved through hole 62 and a straight through hole 63 «while the valve 27 has a kartiaste I> urcbgaa ^ sliohrung 64 and straight Durchgangebokrußg 65 · ¥ i * already mentioned, the rotary valve® 26 and 27 is Y-shaped branch part 21 rotatably mounted. For reasons of "® <$", the valve 26 comprises two axial spacings from one another - which means that extensions 66 and 67 are arranged in corresponding recesses 68 in 69 of part 24. In the same way, aai? @Ntil 27 includes parts 70 and 71, dt® in Auaspsrmagea 72 and 73 See housing part 25 siaä. The continuations® and recesses have such dimensions that the valve © 26 and 27 can turn around a fixed axis

In dea Absweigt @ il 21 curved cavities 74 and 15 are formed, which are ait dea & @ housing parts 24 and 25 in the shown manner in use.Hydraulic actuating devices 76 and 77 are arranged in the branch part and include actuating axles 73 and 79, the extend through corresponding channels in the branch point 21 into the cavities bBWo 75 The hydraulic actuating devices 76 and 77 can be of any known type, and the arms 78 and 79 are optionally from a retracted position (position of the arms 78 ) in Fig. 2 and 3 by means of known devices in an extended position (position · of the arm 79) · In the embodiment shown

. 903887/1229

the actuators 76 and 77 are operated by a hydraulic one Controlled pressure fluid, which is controlled by control valves 52 and 56 according to Pig. 1 is fed. Because valve actuators are known and do not form part of the invention, they are not further described here.

The rotary valves 26 and 27 have notches 80 and 81 uaf, which are in the same plane as cavities 74 and 75 of the branch part 21 lie. Pins 82 and 83 are attached to rotary valves 26 and 27 and extend perpendicularly and are arranged in the incisions 80 and 81, respectively. The actuation arms 73 and 79 branch at their ends and form slotted O-shaped end portions 84 and 85, whose Slots to accept pins 82 and '83, and so on in well known Way to form a connection with these pins.

The following is the operation of the wellhead assembly described. For the sake of simplicity, the Arbeltswelse of the deflector specifically described for half of the arrangement in which the rotary valve 26 is arranged. As Already mentioned, the arrangement described is generally of the type used to obtain two separate zones oil or gas is used and it is easy to see that the operation of the valve 26 associated with the one zone is the same as that of the valve 27, that of the second Zone assigned 1st * In other words, the desired work can be carried out independently for each of the two zones · In Fig. 1 both rotary valves are in the position shown, which they occupy when either the Flud to be won flows from the bore to the storage tank, not shown or when "through-the-flow" work is being carried out. The arms 78 and 79 are in the extended position, and the valves 26 and 27 are arranged so that the curved Through holes 63 and 64 connect between the side line 28 and the vertical line 22 and between the side line 29 and the vertical line 23 cause. If the main valve is open, the recovery fluid can from both pipe strands, not shown. by

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^: . '_:;: 194008?

the wellhead assembly and then through the flow lines 34 and 35 flow. Likewise, "may ^11, instruments, etc. pumped out of the flow lines down into the R _o hrleitungsstränge tools through-the-flow line ·

To allow vertical access for major overhaul or maintenance operations, the actuators 76 and 77 are operated so that their arms 78, 79 and thereby set the rotary valves 26 and 27 in rotation. The valves rotated in this way then take that for valve 26 in Pig. 2 and 3 position shown. In this position, the straight through hole creates 63 of the rotary valve 26 a connection between the vertical bore 36 and the line 22 of the Y-shaped branch part If the control valve 38 is open, vertical access is possible to the interior of the bore, and the flow line 28 is of the associated string or the associated Pipeline blocked in the bore. To ensure the correct arrangement of the rotary valves for the desired work processes To achieve this, they can have projections 86 and 87 which are integral with them and which are formed with the curved recesses 88 and 89 cooperate, the recesses the cavities 74 and 75 are assigned to boundaries to form for the rotary range of the rotary valves.

Valves of a different design than the rotary valves can also be used used as a deflector of the wellhead assembly to act * For example, Figures 4 and 5 show valves 90 and 91 of the axially reciprocating type, which are to die-Bern Purposes. The actuating arms 92 and 93 are assigned to the actuating devices, not shown, optionally the position of the valves to bring in the junction part housing 94 or 95 in their position. The valve 90 has through bores 96 and 97 which extend through the valve body, while the valve. 91 major passage bores 98 and 99 of corresponding shape. If the valve 91 is in the position shown! so there is a fluid connection through the Durohgangabbohrung 99

. ■ 90 9 ^ 8.0-7 / 122 9 -.___ .. _ _ QRKaINAL lii2f * ECTED

ν - 10 -

through between the side line 29 * and the line 14 for the execution of "through-the-flow line * work · As with the deflector of FIGS. 1 to 3, seals are provided in the appropriate locations to provide a liquid-tight seal between valves 90 and 91 and to ensure the surrounding housings in the Y-shaped branch part

Expectations

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Claims (8)

DR-MfG. F. W'ÜKSTIIOFF 8. MUNICH 90 KPL. ING. G. PULS ".« Fc J4 <m 'BCBWEIQER8TRA8SE S Ό »scoasi n.ne.D.BIHIUW8« «β-ΛΚΜΑ« «.», - VATCMTAMVrJlI1TS raoTXOTPATM? Xenon «: 1A-36,664 claims * ■ 1. Wellhead assembly for top mounting a well housing head for regulating the flow rate of the well with a double line which allows vertical access for facilities for drilling such as a circuit introduction of devices into the well, MLt a closure having a vertical line for the well housing head5 a branch !! with a vertical line that is aligned with the vertical line in the closure part, a lateral line that branches off upwards and outwards through the side wall of the branch part, a valve housing provided in the branch part, which is connected to the side line and the vertical line stands, a vertical re-introduction line arranged above the branch part and a deflecting device, characterized in that the deflecting device comprises a valve (26, 27} 90, 91) with through channels (62 to 65l 96 to 99) which are arranged in the housing and laterally opposite the side line (28, 29} 29 «) and the vertical line (14, 22, 15, 23} 14 ¹ , 15 ·) between a first position in which the vertical line (23,22) of the branch part (21 } 21 «) is in flow connection with the rare line via the passage channels, and a second position can be moved in which the vertical line of the branch part extends over the major ducts are in flow connection with the vertical reintroduction line (4O ₉ 41). 2 wellhead arrangement according to claim 1, characterized in that the valve (26, 27 $ 90, 91) se is designed that in the first position the flow connection between the vertical line (22, 23) of the branch part (21, 21 *) and the vertical reintroduction line (40, 41) is interrupted. 9? 9 8 8.77 12 29 3. Wellhead arrangement according to claim 2, characterized in that the valve (26, 27; 90, 91) is designed in such a way that in the second position the flow connection between the vertical line (22, 2J) of the branch part (21, 21 ») And the side line (28, 29? 29 ^f ) is interrupted · 4 · Wellhead arrangement according to claim 1, characterized in that the channel arrangement of the valves (26, 27? 90, 91) a first through hole (62, 64; 96, 99) » which in the first position between the vertical line (22, 23) of the branch part (21, 21 «) and the side line (28, 29 | 29 ') is arranged, and a second through hole (63,65; . £ 7 ». 98), which in the second position between the vertical line of the branch part and the vertical re-introduction line (40, 41) is arranged 5. Wellhead arrangement according to claim 4, characterized in that - g e mark Without the valve being designed as a rotary valve (26, 27) which is operated by a remote-controllable actuating device (76, 77) is movable between the first position and the second position. 6. Wellhead assembly hurt claim 5, characterized in that the rotary valve is a. Projection .. """1 (86, 87) which interacts with a recess (88, 89) in the branch part (21) to limit the range of rotation of the rotary valve. '' 7. Wellhead arrangement according to claim 4, characterized in that that the valve (90, 91) in the axial direction between the first position and the second position is movable to and fro ^70X7 90 9887/1229