CN108999607A - A kind of drilling fluid pulse generator control valve pipe nipple - Google Patents
A kind of drilling fluid pulse generator control valve pipe nipple Download PDFInfo
- Publication number
- CN108999607A CN108999607A CN201810748137.3A CN201810748137A CN108999607A CN 108999607 A CN108999607 A CN 108999607A CN 201810748137 A CN201810748137 A CN 201810748137A CN 108999607 A CN108999607 A CN 108999607A
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- Prior art keywords
- control valve
- radial
- hole
- pipe nipple
- fluid path
- 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.)
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- 239000012530 fluid Substances 0.000 title claims abstract description 88
- 238000005553 drilling Methods 0.000 title claims abstract description 46
- 210000002445 nipple Anatomy 0.000 title claims abstract description 45
- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims 1
- 239000008358 core component Substances 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 description 7
- 239000000306 component Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- Acoustics & Sound (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Multiple-Way Valves (AREA)
Abstract
It is hydrophthalmia at central axes the invention discloses a kind of drilling fluid pulse generator control valve pipe nipple, runs through entire pipe nipple.Pipe nipple upper/lower terminal has upper and lower joint screw thread respectively, and it is converter that pipe nipple lower contact threaded lower end, which extends a part, is provided with winding slot and diversion trench above.A main fluid path hole is provided with inside the pipe nipple wall side of pipe nipple, middle part is opened there are two being connected to inside radial branching hole and control valve storehouse, and lower end extends at converter and be provided with a radial communication hole, is connected to main fluid path hole and diversion trench.Hydrophthalmia upper end is filter screen groove, is equipped with drilling fluid strainer, filter screen groove is connected to main fluid path hole.It is provided with control valve storehouse on the outside of main fluid path hole, control valve core, spool pressure-bearing plug, valve pocket, motor, shaft coupling are installed.It is covered with cover board above control valve storehouse, a relief hole is provided on cover board.The present invention makes full use of nipple body as application valve body, and the core component for pilot control type drilling fluid pulse generator provides pressure controling signal, has the characteristics that compact-sized, assembly is easy.
Description
Technical field
The present invention relates to oil drilling equipment field, specially a kind of drilling fluid pulse generator control valve pipe nipple.
Background technique
With the development of directional well, extended reach well, horizontal well technology, the requirement to drilling measuring technology is higher and higher.?
In work progress, most puzzlement engineers and technicians the problem of be exactly drilling in measurement while-drilling instrument lose drilling fluid pulse signal.
However, huge discharge, high sand content, large scale cutting grain drilling fluid environment under, normal pulsed generator components are easily
Abrasion causes pulse signal amplitude to weaken, and working life reduces.Moreover, this impulse generator structure easily blocks, lead to it
It can not act, to cause the failure of impulse generator.After losing signal, if being further continued for constructing, down-hole information can not
Know, this just makes drilling engineering construction have great blindness.Therefore it only pulls out of hole, maintenance and replacement measuring instrument.This is just
Bit speed is seriously affected.
In view of the above-mentioned problems, developing a kind of New drilling fluid impulse generator, can be become by the elasticity of core component
Shape changes the sectional area of hydrophthalmia in drilling tool, to generate drilling fluid pulse signal, this is simple and reliable for structure, wear-resistant, rapid wear
Part is few, and is not easy to plug.The core component size of the impulse generator of the type is larger, and needs to overcome drilling fluid in tubing string
Pressure generates flexible deformation, and required driving force is higher, and it is larger to directly adopt electrically driven (operated) mode power consumption, so needing using first
Conduction hydraulic-driven, this just needs to develop a kind of pilot control valve, and electric control signal is converted to pressure controling signal, controls core
The movement of center portion part.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of drilling fluid pulse generator control valve pipe nipples, with drilling well
Liquid is transfer medium, and the core component for pilot control type drilling fluid pulse generator provides pressure controling signal, control core
The movement of component.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that: a kind of control of drilling fluid pulse generator
Valve pipe nipple, the pipe nipple are single-revolution body, at central axes for through the hydrophthalmia of entire pipe nipple, pipe nipple upper/lower terminal has respectively on
Joint screw thread, lower contact screw thread, it is converter that pipe nipple lower contact threaded lower end, which extends a part, is provided with coiling above converter
Slot and diversion trench are axially provided with a main fluid path hole inside the pipe nipple wall side of pipe nipple, are provided with control on the outside of main fluid path hole
Valve storehouse is equipped with control valve core, spool pressure-bearing plug, valve pocket, motor, shaft coupling inside control valve storehouse；
Control valve core is a hollow cylindrical revolving body, and inside is a cavity, and lower end closed, upper end opening opens
Mouthful end is equipped with spool pressure-bearing plug, opens that there are two radial valve openings close to closed end side, and two radial valve opening positions are with control valve
Center spool axis is in 180 ° symmetrical for symmetry axis, is provided with a radial valve opening close to open end side, and close with close
The radial valve opening of two of end side is located on same section, and three radial valve openings are connected to control valve valve core inside cavity；
Valve pocket is a hollow cuboid, and inside is a cylindrical cavity, and control valve core is mounted in cavity, valve pocket
Close lower end is provided with a radial hole, and opening close to upper end there are two being symmetry axis using valve pocket central axis is in 180 ° of symmetrical radial directions
Hole, three radial holes are located on same section, and with valve pocket connects with the internal cavities；
Main fluid path hole upper end is equipped with pressure-bearing plug, and middle part opens that there are two radial branching holes to be connected to control valve storehouse inside,
Lower end extends at converter and is provided with a radial communication hole, is connected to main fluid path hole and diversion trench, main fluid path hole is with two diameters
It is that boundary is divided into two parts to branched hole, top half is high pressure fluid path, is connected to upper radial branching hole, and lower half portion is output liquid
Road is connected to lower radial branching hole, is not connected on main fluid path hole with the closing of fluid path sealing-plug between two radial branching holes.
It is covered with cover board above the control valve storehouse, a relief hole is provided on cover board.
The control valve core close to two of closed end side radial valve openings, valve pocket lower end side a radial hole,
Lower radial branching hole in the radial branching hole of two, main fluid path hole, the above-mentioned same diameter in three holes, installation site are coaxial.
The control valve core close to one of open end side radial valve opening, valve pocket upper end side two radial holes,
The relief hole on upper radial branching hole, control valve Hatch Board in the radial branching hole of two, main fluid path hole, the above-mentioned same diameter in four holes, peace
Holding position is coaxial.
The control valve core is connected to the motor by shaft coupling to be connect, and is rotated driven by the motor.
The top connection screw thread is internal screw thread, and lower contact screw thread is external screw thread.
The hydrophthalmia upper end is filter screen groove, is equipped with drilling fluid strainer, filter screen groove is connected to main fluid path hole.
The beneficial effects of the present invention are: drilling fluid pulse generator control valve pipe nipple of the present invention mainly has for pilot control
The core component of type drilling fluid pulse generator provides the effect of pressure controling signal.Pulse signal drive control circuit passes through drive
Dynamic motor drives control valve core to rotate.When high pressure fluid path is connected to by control valve core with output fluid path, the output of control valve pipe nipple
High voltage control signal, drive-pulse generator core component generation movement.When relief hole is connected to by control valve core with output fluid path
When, control valve pipe nipple exports low-voltage control signal, and impulse generator core component resets.Entire pipe nipple is compact-sized, assembly is simple
Just.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of drilling fluid pulse generator control valve pipe nipple of the present invention；
Fig. 2 is that drilling fluid pulse generator control valve pipe nipple of the present invention upper end drilling fluid filter screen groove and main fluid path hole upper end connect
The partial enlarged view at logical place.
Fig. 3 is the partial enlarged view of drilling fluid pulse generator control valve pipe nipple control valve Cang Chu of the present invention.
In figure, 1- control valve pipe nipple；2- hydrophthalmia；3- top connection screw thread；4- lower contact screw thread；5- converter；6- winding slot；
7- filter screen groove；8- drilling fluid strainer；9- main fluid path hole；91- fluid path sealing-plug；92- high pressure fluid path；93- exports fluid path；10- control
Valve storehouse processed；11- control valve core；111- control valve core cavity；112- spool pressure-bearing plug；113- valve pocket；12- motor；121- shaft coupling
Device；13- pressure-bearing plug；14- radial branching hole；The upper radial branching hole 141-；Radial branching hole under 142-；15- radial communication hole；
16- diversion trench；17- control valve Hatch Board；18- relief hole；R- circlip；A- valve opening A；B- valve opening B；C- valve opening C；D- valve pocket is radial
Hole D；E- valve pocket radial hole E；F- valve pocket radial hole F.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description:
As shown in Figure 1-3, drilling fluid pulse generator control valve pipe nipple of the invention, which is single-revolution body, wherein
It is hydrophthalmia 2 at axis, runs through entire pipe nipple, pipe nipple upper/lower terminal has a top connection screw thread 3, lower contact screw thread 4 respectively, under pipe nipple
It is converter 5 that a part is extended in 4 lower end of joint screw thread, and converter 5 is provided with winding slot 6 and diversion trench 16 above, pipe nipple 1 it is short
Section is axially provided with a main fluid path hole 9 inside wall side, and control valve storehouse 10, control valve storehouse 10 are provided on the outside of main fluid path hole 9
Inside is equipped with control valve core 11, spool pressure-bearing plug 112, valve pocket 113, motor 12, shaft coupling 121；
Control valve core 11 be a hollow cylindrical revolving body, inside be a cavity, lower end closed, upper end opening,
Open end is equipped with spool pressure-bearing plug 112, opens that there are two radial valve opening A and C, two radial valve opening positions close to closed end side
It is symmetrical in 180 ° by symmetry axis of control valve center spool axis, a radial valve opening B is provided with close to open end side, and with
Two radial directions valve opening A and C close to closed end side are located on same section.A, the radial valve openings of B, C tri- with control valve valve
The connection of 11 internal cavities 111 of core.
Valve pocket 113 is a hollow cuboid, and inside is a cylindrical cavity, and control valve core 11 is mounted on cavity
In, valve pocket 113 is provided with a radial hole close to lower end, and opening close to upper end there are two being symmetry axis using valve pocket central axis is in 180 °
Symmetrical radial hole, three radial holes are located on same section, and with valve pocket connects with the internal cavities；Valve pocket in the present embodiment
113 are provided with a radial hole D at the one third of lower end, open at the one third of upper end there are two radial hole E and F, two
A radial direction hole site is symmetrical in 180 ° by symmetry axis of 113 central axis of valve pocket.D, tri- radial holes of E, F are located at same section
On, and with 113 connects with the internal cavities of valve pocket.
9 upper end of main fluid path hole is equipped with pressure-bearing plug 13, and middle part opens that there are two in radial branching hole 14 and control valve storehouse 10
Portion's connection, lower end extend at converter 5 and are provided with a radial communication hole 15, connection main fluid path hole 9 and diversion trench 16, main liquid
Road hole 9 is divided into two parts by boundary of two radial branching holes, and top half is high pressure fluid path 92, connects with upper radial branching hole 141
Logical, lower half portion is output fluid path 93, is connected to lower radial branching hole 142, between two radial branching holes on main fluid path hole
It is not connected to the closing of fluid path sealing-plug 91.
The control valve storehouse 10 is covered with cover board 17 above, and a relief hole 18 is provided on cover board.
Valve core 11 is controlled close to two of closed end (lower end) side radial valve opening A and C, 113 lower end side of valve pocket
Lower radial branching hole 142 in one radial hole D, 9 two, main fluid path hole radial branching hole, the above-mentioned same diameter in three holes, installation site
Coaxially.Valve core 11 is controlled close to a radial valve opening B of open end (upper end) side, two diameters of 113 upper end side of valve pocket
Upper radial branching hole 141 into hole E and F, 9 two, main fluid path hole radial branching hole, the relief hole on control valve Hatch Board 17
18, the above-mentioned same diameter in four holes, installation site is coaxial.
The control valve core 11 is connected by shaft coupling 121 with motor 12, and is rotated driven by the motor.
The top connection screw thread is internal screw thread, and lower contact screw thread is external screw thread.
2 upper end of hydrophthalmia is filter screen groove 7, is equipped with drilling fluid strainer 8, filter screen groove 7 is connected to main fluid path hole 9.
The course of work of the invention is described in detail below:
There is pipe nipple of the invention the core component for pilot control type drilling fluid pulse generator to provide pressure control letter
Number effect.In underground work, relief hole 18 is remained to be connected to bore hole annulus, at relief hole 18 pressure always with wellbore
Annular space drilling well liquid columnpressure is equal.Meanwhile high pressure fluid path 92 is remained by filter screen groove 7 and is connected to hydrophthalmia 2, high pressure fluid path
92 pressure are equal with drilling liquid pressure in drill string always.
When not needing to generate drilling fluid pulse, the valve opening B in control valve core 11 is and valve pocket radial hole F, relief hole 18
Connection, valve opening A closing, valve opening C is connected to valve pocket radial hole D, lower radial branching hole 142, in this way, output fluid path 93 is logical
It crosses control valve core 11 to be connected with bore hole annulus, output 93 pressure of fluid path is equal with bore hole annulus drilling well liquid columnpressure, and institute is defeated
Pressure controling signal out is low-voltage control signal.
When needing to generate drilling fluid pulse, electric impulse signal passes to pulse signal drive control circuit first, then
Circuit will drive control valve core 11 to rotate 180 ° 12 output driving electric energy of motor, motor 12 by shaft coupling 121, at this point,
Valve opening B in control valve core 11 is connected to valve pocket radial hole E, upper radial branching hole 141, and valve opening C is closed, valve opening A
It is to be connected to valve pocket radial hole D, lower radial branching hole 142, in this way, high pressure fluid path 92 passes through control valve core 11 and output fluid path
93 conductings, output 93 pressure of fluid path is equal with drilling liquid pressure in drill string, and the pressure controling signal exported is high voltage control
Signal.
In conclusion the contents of the present invention are not limited in the above embodiments, the knowledgeable people in same area exists
Can propose other embodiments within technological guidance's thought of the invention easily, but this embodiment be included in it is of the invention
Within the scope of.
Claims (7)
1. a kind of drilling fluid pulse generator control valve pipe nipple, which is characterized in that the pipe nipple (1) is single-revolution body, central axes
Place is, through the hydrophthalmia (2) of entire pipe nipple, pipe nipple upper/lower terminal has top connection screw thread (3), lower contact screw thread (4), pipe nipple respectively
It is converter (5) that a part is extended in lower contact screw thread (4) lower end, and converter (5) is provided with winding slot (6) and diversion trench above
(16), it is axially provided with a main fluid path hole (9) inside the pipe nipple wall side of pipe nipple (1), is provided with control on the outside of main fluid path hole (9)
Valve storehouse (10) processed is equipped with control valve core (11), spool pressure-bearing plug (112), valve pocket (113), electricity inside control valve storehouse (10)
Machine (12), shaft coupling (121)；
Controlling valve core (11) is a hollow cylindrical revolving body, and inside is a cavity, and lower end closed, upper end opening opens
Mouthful end is equipped with spool pressure-bearing plug (112), opens that there are two radial valve openings close to closed end side, and two radial valve opening positions are to control
Valve core central axis processed is that symmetry axis is symmetrical in 180 °, is provided with a radial valve opening close to open end side, and with it is close
Two of closed end side radial valve openings are located on same section, three radial valve openings with control valve core (11) internal cavities
Connection；
Valve pocket (113) is a hollow cuboid, and inside is a cylindrical cavity, and control valve core (11) is mounted on cavity
In, valve pocket (113) is provided with a radial hole close to lower end, opens that there are two be in using valve pocket central axis as symmetry axis close to upper end
180 ° of symmetrical radial holes, three radial holes are located on same section, and with valve pocket connects with the internal cavities；
Main fluid path hole (9) upper end is equipped with pressure-bearing plug (13), and middle part opens that there are two in radial branching hole and control valve storehouse (10)
Portion's connection, lower end extend at converter (5) and are provided with a radial communication hole (15), are connected to main fluid path hole (9) and diversion trench
(16), main fluid path hole (9) are divided into two parts by boundary of two radial branching holes, and top half is high pressure fluid path, with upper radial direction point
Branch hole (141) connection, lower half portion be output fluid path, be connected to lower radial branching hole (142), between two radial branching holes
It is not connected on main fluid path hole with fluid path sealing-plug (91) closing.
2. drilling fluid pulse generator control valve pipe nipple according to claim 1, which is characterized in that the control valve storehouse (10)
It is covered with above cover board (17), a relief hole (18) is provided on cover board.
3. drilling fluid pulse generator control valve pipe nipple according to claim 1, which is characterized in that the control valve core
(11) close to two radial valve openings, a radial hole of valve pocket lower end side, two, main fluid path hole radial directions point of closed end side
The lower radial branching hole of Zhi Kongzhong, the above-mentioned same diameter in three holes, installation site are coaxial.
4. drilling fluid pulse generator control valve pipe nipple according to claim 2, which is characterized in that the control valve core
(11) close to radial valve opening, two radial holes of valve pocket upper end side, two, a main fluid path hole radial direction point of open end side
Relief hole on the upper radial branching hole of Zhi Kongzhong, control valve Hatch Board, the above-mentioned same diameter in four holes, installation site are coaxial.
5. drilling fluid pulse generator control valve pipe nipple according to claim 1, which is characterized in that the control valve core
(11) it is connected by shaft coupling (121) with motor (12), and is rotated driven by the motor.
6. drilling fluid pulse generator control valve pipe nipple according to claim 1, which is characterized in that the top connection screw thread is
Internal screw thread, lower contact screw thread are external screw thread.
7. drilling fluid pulse generator control valve pipe nipple according to claim 1, which is characterized in that hydrophthalmia (2) upper end
It for filter screen groove (7), is equipped with drilling fluid strainer (8), filter screen groove (7) is connected to main fluid path hole (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810748137.3A CN108999607B (en) | 2018-07-10 | 2018-07-10 | Control valve nipple of drilling fluid pulse generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810748137.3A CN108999607B (en) | 2018-07-10 | 2018-07-10 | Control valve nipple of drilling fluid pulse generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108999607A true CN108999607A (en) | 2018-12-14 |
| CN108999607B CN108999607B (en) | 2021-11-23 |
Family
ID=64599173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810748137.3A Active CN108999607B (en) | 2018-07-10 | 2018-07-10 | Control valve nipple of drilling fluid pulse generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108999607B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043232A (en) * | 2019-04-24 | 2019-07-23 | 西南石油大学 | A kind of thick oil underground well pendular ring generator based on hollow rod |
| CN113565818A (en) * | 2021-07-22 | 2021-10-29 | 上海理工大学 | Electric control pressure regulating valve for hydraulic traction bed and control system thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2446357A1 (en) * | 2002-11-04 | 2004-05-04 | Precision Drilling Technology Services Gmbh | Device for producing of electric energy and of signal transmitting pressure pulses |
| CN102400680A (en) * | 2010-09-13 | 2012-04-04 | 昆山中慈工控科技开发有限公司 | Piston type negative-pressure pulse wave generation and detection device |
| US20120273271A1 (en) * | 2011-04-28 | 2012-11-01 | William Stuart-Bruges | Measurement-while-drilling mud pulser and method for controlling same |
| CN103696762A (en) * | 2013-12-29 | 2014-04-02 | 中国石油集团渤海钻探工程有限公司 | Rotation-driven swing valve type continuous wave generator |
| CN104196521A (en) * | 2014-09-18 | 2014-12-10 | 中国石油集团渤海钻探工程有限公司 | Rotary valve mud-pulse generator |
-
2018
- 2018-07-10 CN CN201810748137.3A patent/CN108999607B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2446357A1 (en) * | 2002-11-04 | 2004-05-04 | Precision Drilling Technology Services Gmbh | Device for producing of electric energy and of signal transmitting pressure pulses |
| CN102400680A (en) * | 2010-09-13 | 2012-04-04 | 昆山中慈工控科技开发有限公司 | Piston type negative-pressure pulse wave generation and detection device |
| US20120273271A1 (en) * | 2011-04-28 | 2012-11-01 | William Stuart-Bruges | Measurement-while-drilling mud pulser and method for controlling same |
| CN102777172A (en) * | 2011-04-28 | 2012-11-14 | 桑德克斯有线有限公司 | Measurement-while-drilling mud pulser and method for controlling same |
| CN103696762A (en) * | 2013-12-29 | 2014-04-02 | 中国石油集团渤海钻探工程有限公司 | Rotation-driven swing valve type continuous wave generator |
| CN104196521A (en) * | 2014-09-18 | 2014-12-10 | 中国石油集团渤海钻探工程有限公司 | Rotary valve mud-pulse generator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043232A (en) * | 2019-04-24 | 2019-07-23 | 西南石油大学 | A kind of thick oil underground well pendular ring generator based on hollow rod |
| CN110043232B (en) * | 2019-04-24 | 2021-08-20 | 西南石油大学 | Underground thick oil liquid ring generator based on hollow sucker rod |
| CN113565818A (en) * | 2021-07-22 | 2021-10-29 | 上海理工大学 | Electric control pressure regulating valve for hydraulic traction bed and control system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108999607B (en) | 2021-11-23 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20211018 Address after: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Applicant after: CNPC Bohai Drilling Engineering Co.,Ltd. Applicant after: CHINA NATIONAL PETROLEUM Corp. Address before: China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd., No. 83, Second Street, economic and Technological Development Zone, Binhai New Area, Tianjin, 300457 Applicant before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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