CN107672763B - A kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment - Google Patents
A kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment Download PDFInfo
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- CN107672763B CN107672763B CN201710779387.9A CN201710779387A CN107672763B CN 107672763 B CN107672763 B CN 107672763B CN 201710779387 A CN201710779387 A CN 201710779387A CN 107672763 B CN107672763 B CN 107672763B
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- wirerope
- locking
- hole
- underwater equipment
- inner housing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
- B63C7/16—Apparatus engaging vessels or objects
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of wirerope to assist the long-range fishing device of self-locking underwater equipment, is made of wirerope, wirerope fixed ring, fastener, plug, compressed spring, suspension pin, gravity ring, gravity ring supporting block, locking actuating sleeve, outer housing, latch segment, inner housing and anchoring.Apparatus of the present invention, under ROV auxiliary, only by self gravity and from locking mechanism, the anchoring of underwater equipment is fixed in automatic centering and locking, realize damaged or fracture the guide steel wire rope in deep water quick replacement guide post, restore guide rope guiding role, it realizes deep water operating condition and transfers installation underwater equipment without recycling and again, i.e. replaceable abnormal steel cord, and the function of underwater equipment can be quickly recycled without specific purpose tool, underwater equipment operating efficiency is effectively increased, operating cost and operating risk are reduced.
Description
Technical field
The invention belongs to petroleum gas drilling and extracting equipment technical fields, are related to a kind of wirerope auxiliary self-locking underwater equipment
Long-range fishing device.
Background technique
In the subsea equipment system of guide rope mounting means, drilling equipment is between job platform and underwater well head
Guiding when operation is usually realized that guide rope starts from job platform by guide rope, is passed down through the guide post of subsea equipment
After be fixed on wellhead assembly.During being drilled well operations, often there are the feelings of one or more guiding fracture of rope or damage
Condition, if guide rope breakage has exceeded the job area of diver, diver is unable to the quick-replaceable that guide rope is completed in dive,
At this point, the guiding device containing guide post need to be fetched into job platform by specific purpose tool, the wirerope more renewed, and transfer again
After installation and guide device to underwater wellhead, operation can be continued.In the subsea production system of no guide rope mounting means, one
Aspect, when installing subsea production tree or subsea equipment, installation sealing test is easy failure；On the other hand, ocean operation ring
Border is fast changing, is easy to appear the emergency cases such as typhoon, tsunami；When there is above-mentioned condition, need using specific purpose tool to water
Lower equipment is promptly recycled.Specific purpose tool recycling underwater equipment operation difficulty is big, complex for operation step.In conclusion traditional
Processing method with the abnormal conditions that can be coped in two kinds of systems, the single job time is long, and operating efficiency is low, and operating risk is big, deep
Water operating cost is high.Therefore, it is badly in need of developing a kind of long-range fishing device easy to operate, response is fast, realizes deep water wirerope
It connects again, underwater equipment remotely connects and quickly recycling.
Summary of the invention
The object of the present invention is to provide a kind of wirerope to assist the long-range fishing device of self-locking underwater equipment, solves existing
Present in technology deep water and ultra-deep-water diver can not operation the problem of.
The technical scheme adopted by the invention is that a kind of wirerope assists the long-range fishing device of self-locking underwater equipment, packet
The inner housing for being set as step rotary structure is included, the inner wall upper end of inner housing has been connected through a screw thread wirerope fixed ring,
Wirerope is installed, it is platform on the inside of outer housing that inner housing outer wall lower end, which has been connected through a screw thread outer housing, in wirerope fixed ring
The stepwise surface of revolution, is arranged with one end of locking actuating sleeve between inner housing and outer housing, the other end of locking actuating sleeve is set in
Gravity ring is provided between wirerope fixed ring and outer housing, in inner housing, inner housing upper surface is provided with step via hole E, platform
Suspension pin is equipped in rank via hole E, suspension pin is threadedly coupled gravity ring, and locking actuating sleeve is step rotary structure, locking
The step surface of actuating sleeve and the upper surface of inner housing cooperate, and offer tapped through hole B, inner housing on the step surface of locking actuating sleeve
Upper surface offers blind hole D, tapped through hole B and blind hole D coaxial arrangement, and tapped through hole B and blind hole D are placed with compression bullet jointly
Spring, inner housing top are provided with radial direction through-hole F, and lower part is provided with radial direction through-hole G, is provided with gravity ring in through-hole F
Supporting block is provided with latch segment in through-hole G.
Inner housing inner housing lower part inner hole is cone structure.
Upper locking ring slot and lower locking annular groove are offered on the inner cylinder face of locking actuating sleeve.
Wirerope fixed ring is rotary structure, and wirerope fixed ring inner wall is equipped with and matches with the loquat knot of wirerope
Step surface and the conical surface.
Outer housing upper end is evenly equipped with tapped through hole A, and fastener I or fastener II are screwed in threaded hole.
Outer housing and inner housing periphery are radially provided with annular groove d and annular groove e.
Tapped through hole B and blind hole D equal diameter are arranged, and are located above compressed spring in tapped through hole B and are also equipped with plug.
Wirerope is connected with anchoring.
Anchoring upper end is cone structure, and anchoring periphery is provided with locking annular groove, and anchoring, which is located in inner housing, conical surface knot
One end of structure.
Latch segment is L-type split type structure.
The invention has the advantages that the present apparatus passes through wirerope and underwater ROV less important work, not by the limit of operating water depth
System, solves the problems, such as that deep water and ultra-deep-water diver can not operations；The present apparatus is suitable for guide rope installing type and without guide rope
A variety of underwater equipments such as mounted subsea production tree, subsea equipment and Permanent guide structure, it is versatile；It is oriented to steel wire
Docking and locking can be completed without power source and special tool(s) in the long-range connection function again of rope, and operation success rate is high；It is mentioned by winch
The operation mode for rising wirerope salvaging underwater equipment is not only easy to operate, is not necessarily to special operation training, and good reliability, operation
It is high-efficient；Present apparatus structure is simple, and reusable, can carry out repeatedly locking and unlocking operation, system from different underwater equipments
Cause this low with use cost；It is connect again and underwater equipment in conclusion the present apparatus greatly reduces underwater equipment guide steel wire rope
The operating cost and risk promptly recycled.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the wirerope auxiliary long-range fishing device of self-locking underwater equipment of the present invention；
Fig. 2 is that a kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment of the present invention is lauched in job platform completion
The structural schematic diagram of preceding setting；
Fig. 3 is a kind of knot of the long-range underwater anchoring 13 of fishing device contact of wirerope auxiliary self-locking underwater equipment of the present invention
Structure schematic diagram；
Fig. 4 is that a kind of gravity ring supporting block 8 of the wirerope auxiliary long-range fishing device of self-locking underwater equipment of the present invention solves
The structural schematic diagram of lock；
Fig. 5 is a kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment of the present invention and 13 locking of underwater anchoring
Structural schematic diagram.
In figure, 1. wirerope, 2. wirerope fixed rings, 3. fasteners I, 4. plugs, 5. compressed springs, 6. suspension pins, 7.
Gravity ring, 8. gravity ring supporting blocks, 9. locking actuating sleeves, 10. outer housings, 11. latch segments, 12. inner housings, 13. anchorings, 14.
Fastener II, 15. step via hole E, 16. tapped through hole B, 17. blind hole D, 18. through-hole F, 19. through-hole G, 20. upper locking ring slots,
21. lower lock annular groove, 22. tapped through hole A, 23. annular groove d, 24. annular groove e, 25. locking annular grooves.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of wirerope of the invention assists the long-range fishing device of self-locking underwater equipment, as shown in Figure 1, including being set as
The inner wall upper end of the inner housing 12 of step rotary structure, inner housing 12 has been connected through a screw thread wirerope fixed ring 2, steel wire
Wirerope 1 is installed, 12 outer wall lower end of inner housing has been connected through a screw thread outer housing 10,10 inside of outer housing in rope fixed ring 2
For the step surface of revolution, be arranged with one end of locking actuating sleeve 9 between inner housing 12 and outer housing 10, locking actuating sleeve 9 it is another
One end is set between wirerope fixed ring 2 and outer housing 10, and gravity ring 7,12 upper surface of inner housing are provided in inner housing 12
It is provided with step via hole E15, suspension pin 6 is equipped in step via hole E15, suspension pin 6 is threadedly coupled gravity ring 7, locking driving
Set 9 is step rotary structure, and the step surface of locking actuating sleeve 9 and the upper surface of inner housing 12 cooperate, locking actuating sleeve 9
Tapped through hole B16 is offered on step surface, it is same that 12 upper surface of inner housing offers blind hole D17, tapped through hole B16 and blind hole D17
Axis setting, tapped through hole B16 and blind hole D17 are placed with compressed spring 5 jointly, and 12 top of inner housing is provided with radial direction through-hole
F18, lower part are provided with radial direction through-hole G19, and gravity ring supporting block 8 is provided in through-hole F18, is provided with lock in through-hole G19
Tight block 11.
12 inner housing of inner housing, 12 lower part inner hole is cone structure, has guiding role.
Upper locking ring slot 20 and lower locking annular groove 21 are offered on the inner cylinder face of locking actuating sleeve 9.
Wirerope fixed ring 2 is rotary structure, and 2 inner wall of wirerope fixed ring is equipped with to match with the loquat knot of wirerope 1
The step surface and the conical surface of conjunction.
10 upper end of outer housing is evenly equipped with tapped through hole A22, and fastener I 3 or fastener II 14 are screwed in threaded hole.
Outer housing 10 and 12 periphery of inner housing are radially provided with annular groove d23 and annular groove e24.
Tapped through hole B16 and blind hole D17 equal diameter are arranged, and are located above compressed spring 5 in tapped through hole B16 and are also equipped with
Plug 4.
Wirerope 1 is connected with anchoring 13.
Being anchored 13 upper ends is cone structure, and 13 peripheries of anchoring are provided with locking annular groove 25, and anchoring 13 is located at inner housing 12
Inside there is one end of cone structure.
Locking actuating sleeve 9 of the invention is step rotary structure, when inner housing 12 is fixed, locking actuating sleeve
9 axially downward certain distance, compressed spring 5 can be compressed under external force, when external force release, compressed spring 5
Reset, locking actuating sleeve 9 is pushed into upper limit position by elastic force.
Gravity ring supporting block 8 of the invention be split type structure, as shown in figure 4, gravity ring supporting block 8 can radially from by
It is mobile.When locking actuating sleeve 9 is moved to upper limit position, the inside and outside two sides of gravity ring supporting block 8 respectively with locking actuating sleeve 9
Inner wall, the contact of 7 small end external cylindrical surface of gravity ring.When locking actuating sleeve 9 is moved to lower limit position, locking actuating sleeve 9 it is upper
Locking annular groove 20 is aligned with gravity ring supporting block 8, and gravity ring supporting block 8 squeezes into upper locking ring under the gravity of gravity ring 7
In slot 20,8 inside of gravity ring supporting block is contacted with 7 big end external cylindrical surface of gravity ring at this time.
Latch segment 11 of the invention is L-type split type structure, and latch segment 11 is mounted in through-hole G19, and a lateral inner casing
Body 12 is projecting inward, and latch segment 11 is mounted on the part in through-hole G19 higher than the part projecting inward to inner housing 12, when locking drives
When set 9 is moved to upper limit position, 11 outside of latch segment is contacted with 9 inner wall of locking actuating sleeve, and latch segment 11 is mounted on through-hole G19
Interior high part is contacted with the step excircle of inner housing 12, prevents latch segment 11 from deviating from；As shown in figure 5, the locking of anchoring 13
Locking faces neat on the inside of annular groove 25 and latch segment 11, i.e. lockable.When locking actuating sleeve 9 is moved to lower limit position, locking
The lower locking annular groove 21 of actuating sleeve 9 is aligned with latch segment 11, and latch segment 11 can be squeezed under external force in lower locking annular groove 21.
A kind of working principle of wirerope auxiliary long-range fishing device of self-locking underwater equipment of the invention are as follows:
Mode 1): guide steel wire rope connects again
Operating condition description: the Permanent guide structure guide post or guiding rope type subsea production tree guiding of subsea equipment system
The guide post of device has been fixed under water, and anchoring 13 is located at guiding top end, single or more guide rope of the above guiding device
Fracture, needs replacing, and operating water depth exceeds diver's working range.
Preparation: 1. under water, the remaining fracture wirerope for stretching out anchoring 13 is cut by ROV tool, and remove
Sundries in anchoring 13.2. checking that inner housing 12 is reliably connected with outer housing 10 wirerope 1 is non-on job platform or deck
One end of loquat knot sequentially passes through gravity ring 7, wirerope fixed ring 2, and is fixed on winch；Slowly rotation winch, until steel
1 loquat knot of cord is moved to 2 step surface of wirerope fixed ring.The present apparatus is placed vertically, fastener I 3 is removed, is screwed into fastener
II 14 lock to extreme position at this point, locking actuating sleeve 9 moves axially into lower limit position with being screwed into for fastener II 14
Tight actuating sleeve 9 and 12 step face contact of inner housing, are lifted up the present apparatus, observe confirmation gravity by 12 lower ending opening of inner housing
Ring 7 has fallen, and gravity ring supporting block 8 is squeezed under the gravity of gravity ring 7 in 9 upper locking ring slot 21 of locking actuating sleeve, shape
State is as shown in Fig. 2.3. not being squeezed into 9 upper locking ring slot 21 of locking actuating sleeve such as gravity ring supporting block 8, using falling vertically
Method, until gravity ring 7 falls, supporting block 8 is squeezed into upper locking ring slot 21.4. removing fastener II 14, it is screwed into fastening again
Part I 3.
Guide steel wire rope connects again: 1. on job platform or deck, keeping the present apparatus in a vertical state, slowly rotation twists
Vehicle, the present apparatus are transferred with wirerope, until device stops decentralization close to target anchoring 13.Under water, ROV manipulator passes through folder
12 annular groove e of 10 annular groove d of outer housing or inner housing, the mobile present apparatus to 13 surface of anchoring are held, and makes anchoring 13 and inner housing 12
Between have a distance.Winch is rotated, wirerope 1 is discharged, makes the loquat knot of wirerope 1 close to transverse plane in anchoring 13.ROV machine
Tool hand discharges the present apparatus suddenly, during present apparatus freely falling body, in anchoring 13 end cone face first with 11 inside lower end of latch segment
Contact of incline plane, state are as shown in Fig. 3；With moving under device, anchoring 13 continues opposite latch segment 11 and moves up, by latch segment
11 squeeze into lower locking annular groove 21, so that anchoring 13 passes through latch segment, until being anchored upper transverse plane and 7 lower plane of gravity ring
Contact, state are as shown in Fig. 4；As device continues to fall, anchoring 13 jacks up gravity ring 7 to upper limit position upwards, causes
The radial freedom degree release of gravity ring supporting block 8, spring 5 reset, and locking actuating sleeve 9 is moved up by 5 rebound effect of spring, will
Gravity ring supporting block 8 squeezes into 7 lower part outer circle of gravity ring, meanwhile, also latch segment 11 is also squeezed into the locking annular groove 25 of anchoring 13,
13 locking of realization device and anchoring, state are as shown in Fig. 5.
2. so far wirerope 1 is connected in anchoring 13, the replacement of wirerope is completed, guide post and guide steel wire rope can continue
Carry out guiding role.
Mode 2) carry out underwater equipment urgent recycling operation
Operating condition description: anchoring 13 is fixed on the mounted subsea production tree of no guide rope, when subsea production tree operation
Occur sealing test failure, hydraulic control system failure in journey or dash forward when meeting the bad weathers such as typhoon, tsunami, work need to be interrupted
Industry promptly recycles subsea production tree.The mounted subsea production tree of guide rope and containing Permanent guide structure underwater well head dress
It sets, after decentralization is installed to target position, for guide steel wire rope as withdrawn with operation ship, anchoring 13 is located at guide post upper end；Root
According to job requirements, subsea production tree, Permanent guide structure and (or) subsea equipment need to promptly be recycled.
Preparation: 1. under water, the sundries in anchoring 13 is removed by ROV cleaning means.Remaining and the step in mode 1
It is rapid 2. 3. 4. identical.
Urgent recycling underwater equipment: with mode 1), it completes wirerope 1 and connect and lock with anchoring 13, be lifted up steel wire
Rope 1, wirerope 1 drive anchoring 13 and underwater equipment to move up, until subsea production tree (no guiding rope type with have guide rope
Formula), the underwater equipments such as Permanent guide structure and (or) subsea equipment be recovered to job platform.Fastener I 3 is removed, is screwed into
Fastener II 14 arrives extreme position, so that locking actuating sleeve 9 is moved axially into lower limit position, is lifted up outer housing 10, weight
Power ring supporting block 8 is squeezed into upper locking ring slot 21, and latch segment 11 is squeezed into lower locking annular groove 22, after 13 unlock of the present apparatus and anchoring
It is detached from underwater equipment.The present apparatus is checked and cleans, for future use.
The invention discloses a kind of wirerope to assist the long-range fishing device of self-locking underwater equipment, and the present apparatus can be used for deep water
The long-range quick connection of the guide steel wire rope of underwater guide device exception re-establishes leading for marine equipment and underwater guide device
To function；The evils such as the present apparatus can also be used in surface hydraulic control system failure, underwater equipment sealing test fails or encounters typhoon
It whens bad weather etc., is assisted by ROV, the long-range connection and locking of wirerope and underwater equipment waterborne is completed, by promoting steel wire
Rope realizes that the underwater equipments such as subsea production tree, Permanent guide structure, subsea equipment are quickly recovered to job platform.Advantage
It is the present apparatus by wirerope and underwater ROV less important work, is not limited by operating water depth, be applicable to a variety of underwater equipments；
Remotely connection function is easy to operate again for guide steel wire rope, docking and locking can be completed without power source and special tool(s)；Pass through strand
Vehicle boom hoist cable salvages underwater equipment good reliability, operates success rate and operating efficiency is high and reusable, reduce depth
Wetting system recycles operating cost and risk.
Claims (9)
1. a kind of wirerope assists the long-range fishing device of self-locking underwater equipment, which is characterized in that returned including being set as step
The inner wall upper end of the inner housing (12) of swivel structure, the inner housing (12) has been connected through a screw thread wirerope fixed ring (2), institute
It states and is equipped with wirerope (1) in wirerope fixed ring (2), inner housing (12) the outer wall lower end has been connected through a screw thread outer housing
(10), it is the step surface of revolution on the inside of the outer housing (10), is arranged with lock between the inner housing (12) and outer housing (10)
One end of tight actuating sleeve (9), the other end of the locking actuating sleeve (9) are set in wirerope fixed ring (2) and outer housing (10)
Between, it being provided with gravity ring (7) in the inner housing (12), inner housing (12) upper surface is provided with step via hole E (15),
It is equipped with suspension pin (6) in the step via hole E (15), the suspension pin (6) is threadedly coupled the gravity ring (7), the lock
Tight actuating sleeve (9) is step rotary structure, and the upper surface of the step surface and inner housing (12) of the locking actuating sleeve (9) is matched
It closes, is offered tapped through hole B (16) on the step surface of the locking actuating sleeve (9), inner housing (12) upper surface offers
Blind hole D (17), the tapped through hole B (16) and the blind hole D (17) are coaxially disposed, the tapped through hole B (16) and blind hole D
(17) it is placed with jointly compressed spring (5), inner housing (12) top is provided with radial direction through-hole F (18), lower part setting
There is radial direction through-hole G (19), gravity ring supporting block (8), setting in the through-hole G (19) are provided in the through-hole F (18)
There are latch segment (11)；
Upper locking ring slot (20) and lower locking annular groove (21) are offered on the inner cylinder face of the locking actuating sleeve (9).
2. a kind of wirerope according to claim 1 assists the long-range fishing device of self-locking underwater equipment, which is characterized in that
The 12 lower part inner hole of inner housing (12) inner housing is cone structure.
3. a kind of wirerope according to claim 1 assists the long-range fishing device of self-locking underwater equipment, which is characterized in that
The wirerope fixed ring (2) is rotary structure, and wirerope fixed ring (2) inner wall is equipped with the loquat knot with wirerope 1
The step surface and the conical surface matched.
4. a kind of wirerope according to claim 1 assists the long-range fishing device of self-locking underwater equipment, which is characterized in that
10 upper end of outer housing is evenly equipped with tapped through hole A (22), and fastener I (3) or fastener II (14) are screwed in the threaded hole.
5. a kind of wirerope according to claim 1 assists the long-range fishing device of self-locking underwater equipment, which is characterized in that
The outer housing (10) and inner housing (12) periphery are radially provided with annular groove d (23) and annular groove e (24).
6. a kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment according to requiring 1, which is characterized in that described
Tapped through hole B (16) and blind hole D (17) equal diameter are arranged, and are located above compressed spring (5) in the tapped through hole B (16)
It is also equipped with plug (4).
7. a kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment according to requiring 1, which is characterized in that described
Wirerope (1) is connected with anchoring (13).
8. a kind of wirerope according to claim 7 assists the long-range fishing device of self-locking underwater equipment, which is characterized in that
Anchoring (13) upper end is cone structure, and described anchoring (13) periphery is provided with locking annular groove (25), the anchoring (13)
There is one end of cone structure in inner housing (12).
9. a kind of wirerope according to claim 8 assists the long-range fishing device of self-locking underwater equipment, which is characterized in that
The latch segment (11) is L-type split type structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710779387.9A CN107672763B (en) | 2017-09-01 | 2017-09-01 | A kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710779387.9A CN107672763B (en) | 2017-09-01 | 2017-09-01 | A kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107672763A CN107672763A (en) | 2018-02-09 |
| CN107672763B true CN107672763B (en) | 2019-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710779387.9A Active CN107672763B (en) | 2017-09-01 | 2017-09-01 | A kind of wirerope auxiliary long-range fishing device of self-locking underwater equipment |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO322086B1 (en) * | 2003-04-01 | 2006-08-14 | Smedvig Offshore As | Device for attaching a conductor-provided cable |
| CN2739413Y (en) * | 2003-12-31 | 2005-11-09 | 白宝鲲 | Rope connecting device |
| CN201129149Y (en) * | 2007-08-31 | 2008-10-08 | 王志杰 | Mechanical type rotating anchoring device |
| CN201531234U (en) * | 2009-10-30 | 2010-07-21 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Anchor of side-passing cable oil pipe |
| CN202946067U (en) * | 2012-12-06 | 2013-05-22 | 中国石油集团西部钻探工程有限公司 | Mechanical pit shaft anchoring device |
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2017
- 2017-09-01 CN CN201710779387.9A patent/CN107672763B/en active Active
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Effective date of registration: 20201229 Address after: 721002 No.2 Dongfeng Road, Jintai District, Baoji City, Shaanxi Province Patentee after: Baoji Oilfield Machinery Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC national oil and gas drilling equipment Engineering Technology Research Center Co., Ltd Address before: 721002 No.2 Dongfeng Road, Jintai District, Baoji City, Shaanxi Province Patentee before: Baoji Oilfield Machinery Co.,Ltd. |