CN106368640B - Using the process of junk and solution tubing string sand card special-shaped in coiled tubing fishing oil pipe - Google Patents
Using the process of junk and solution tubing string sand card special-shaped in coiled tubing fishing oil pipe Download PDFInfo
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- CN106368640B CN106368640B CN201610970068.1A CN201610970068A CN106368640B CN 106368640 B CN106368640 B CN 106368640B CN 201610970068 A CN201610970068 A CN 201610970068A CN 106368640 B CN106368640 B CN 106368640B
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- Prior art keywords
- coiled tubing
- sand
- junk
- tubing string
- rotation
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- 239000004576 sand Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011010 flushing procedure Methods 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims abstract description 9
- 230000004913 activation Effects 0.000 claims abstract description 4
- 238000010408 sweeping Methods 0.000 claims abstract description 4
- 238000010079 rubber tapping Methods 0.000 claims abstract description 3
- 210000000515 tooth Anatomy 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 9
- 210000002445 nipple Anatomy 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 229910000679 solder Inorganic materials 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/03—Freeing by flushing
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of using junk special-shaped in coiled tubing fishing oil pipe and solves the process of tubing string sand card, includes the following steps：Special-shaped junk tool is salvaged using coiled tubing tail band coiled tubing, pulls the junk on sand plug face out；Sand flushing tool is rotated using coiled tubing tail band coiled tubing, rotation sweeps away blocking in releasing pipe；If the sand card outside tubing string still cannot be released after sweeping away, perforated using tubing string；After tubing string perforation, the mode for tapping sand washing paragraph by paragraph up and down is carried out with coiled tubing tail band coiled tubing rotation sand flushing tool, gradually activation blocking outer tunnel, washes out wild card sand；Movable original well casing column, reaches tubing string unfreezing；The replacement complete well of tubing string tripping in is produced.Oil-water well channel blockage is solved, the operating condition that normal circulation sweeps away de-plugging is unable to, is salvaged by tripping in coiled tubing band and sand-flushing pipe column implements tubing string unfreezing operation.
Description
Technical field
It is especially a kind of using abnormity in coiled tubing fishing oil pipe the present invention relates to a kind of overhaul pipeline of oil field development
Junk and the process for solving tubing string sand card, for tubing string channel blockage in well and top is there are junk, is that a kind of safety can
It leans on, is high-efficient, the process that operating cost is low.
Background technique
At present during oilfield downhole operation, it may appear that shake out in well and cause tubing string card, while blocking and leading to inside and outside tubing string
Road cannot establish normal circulation, or even the well having also special-shaped junk on sand face, cause that punching cannot be reached using coiled tubing
The effect of sand de-plugging.
The mode that such result can only often take overhaul to salvage could be handled, long in time limit, at high cost.It can not be efficiently fast
Victory handles such down-hole accident.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of using junk reconciliation special-shaped in coiled tubing fishing oil pipe
The certainly process of tubing string sand card reaches substitution overhaul, shortens the purpose of period reduction cost.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that：It is a kind of to use coiled tubing fishing oil pipe
Interior abnormity junk and the process for solving tubing string sand card, include the following steps：
Step 1 salvages special-shaped junk tool using coiled tubing tail band coiled tubing, pulls the junk on sand plug face out；
Step 2 rotates sand flushing tool using coiled tubing tail band coiled tubing, and rotation sweeps away blocking in releasing pipe；
If step 3 still cannot release sand card outside tubing string after sweeping away, perforated using tubing string；
After step 4, tubing string perforation, carry out tapping punching paragraph by paragraph up and down with coiled tubing tail band coiled tubing rotation sand flushing tool
The mode of sand, gradually activation blocking outer tunnel, washes out wild card sand；
Step 5, the former well casing column of activity, reach tubing string unfreezing；
Step 6, the replacement complete well of tubing string tripping in are produced.
The beneficial effects of the invention are as follows：Short time limit, at low cost, efficient quick processing down-hole accident, it is real by field test
Special-shaped falling object fishing and solution desanding card in existing tubing string, it is ensured that former well casing column is unimpeded, normally removes and has replaced well.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that coiled tubing of the invention salvages special-shaped junk tool.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is the structural schematic diagram of coiled tubing rotation sand flushing tool of the invention.
Fig. 4 is A-A sectional view in Fig. 3.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description：
Firstly, being said to the special-shaped junk tool of coiled tubing salvaging and coiled tubing rotation sand flushing tool of the invention
It is bright：
As shown in Figs. 1-2, coiled tubing of the invention salvages special-shaped junk tool, including top connection 1, salvage connecting tube 3,
Outer cylinder 6, guiding shoes 7, top connection 1 are a cylinder, and upper and lower end inner wall has internal screw thread, upper end internal screw thread and coiled tubing bottom end
Nipple connection, lower end internal screw thread with salvage 3 upper end of connecting tube external screw thread connect, salvaging connecting tube 3 be a cylinder, beat
The cylinder body outer wall of fishing 3 lower half of connecting tube is axially provided with two perforation seams 4 for penetrating into bottom end, is salvaging connecting tube
3 inner walls are provided with multiple interior briar tooths 5 along the edge of 4 perforation seams, and interior 5 tooth tip of briar tooth is received into axle center, make to salvage under connecting tube 3
5 high resilience of half portion and interior briar tooth is formed with inner chamfer with interior tightening, the bottom end face for salvaging 3 inner wall of connecting tube convenient for opening,
The outside for salvaging connecting tube 3 is provided with outer cylinder 6, the upper end of outer cylinder 6 is fixed in top connection 1, and lower end is fixed with guiding shoes 7,
There are make to salvage the flexible annular space in 3 lower half of connecting tube between the inner wall of outer cylinder 6 and the outer wall for salvaging connecting tube 3.
It is preferred that the top connection 1 is integrated with outer cylinder 6 by 2 integral solder of welding surface.
It is preferred that being provided with 3 interior briar tooths 5 along the edge of every perforation seam 4 salvaging 3 inner wall of connecting tube.The perforation seam 4
Both ends positioned at the same diameter for salvaging connecting tube 3 are formed.
For the ease of construction, the guiding shoes 7 can be dismantled.
Specifically, the two uniformly distributed perforation seams 4 outputed realize elasticity folding, 4 edges of perforation seam, which are cut out in multiple tracks, to be received
Interior briar tooth；Outer cylinder 6 played during removing coiled tubing protect salvage connecting tube, interior briar tooth and fished out special-shaped junk from
The effect of external force direct friction and impact.The introducing that shoes 7 are conducive to welt junk (in casing) in oil pipe is guided, raising is salvaged successfully
Rate.
This fishing tool is connected to coiled tubing bottom end, and lower end guides shoes and introduces by fishing junk, salvages connecting tube lower half
While opening embraces junk, interior briar tooth is firmly linked with irregular junk step (effect that chucking power also can be improved in no step), is realized
External by fishing junk is salvaged, and is a kind of fishing tool of going into the well safe and reliable, high-efficient, operating cost is low.
As shown in Figure 3,4, coiled tubing of the invention rotates sand flushing tool, including top connection 11, cover cylinder 12, rotation connection
Bar 16, connection variable buckle 17, rotation sand washing head 19, coiled tubing are connected by screw thread with 11 top of top connection, 11 lower part of top connection
It is connected by screw thread with cover cylinder 12, cover cylinder 12 is a circular cylinder body, and there is stepped hole in 12 bottom end of cover cylinder, rotates the top of connecting rod 16
The centre of the upper bearing (metal) 13 and lower bearing 14 that are mounted on 12 inner wall of cover cylinder is simultaneously suspended in cover cylinder 12, rotates the lower part of connecting rod 16
The end of thread is pierced by the stepped hole of 12 bottom end of cover cylinder, so that rotation connecting rod 16 is rotated in cover cylinder 12, rotates under connecting rod 16
Portion's end of thread is connected by spiral shell button with the top for connecting variable buckle 17, and the bottom of connection variable buckle 17 passes through screw thread and rotation sand washing head 19
Connection forms and rotates integrally sand flushing tool, is formed with multiple groups jet stream pore channels 15 in the lower part outer wall of rotation sand washing head 19,
Multiple axial diversion pieces 18 are provided on close to 19 upper inside wall of rotation sand washing head of connection variable buckle 17.
Specifically, top connection 11 is a cylinder, upper end inner wall has internal screw thread, and lower part outer wall has external screw thread, top connection 11
Upper end internal screw thread is connect with the nipple of coiled tubing bottom end, and 11 lower external thread of top connection is interior with 12 top inner wall of cover cylinder
Screw thread is connected, and axial diversion piece 18 is welded as a whole with rotation sand washing head 19.
The axial diversion piece 18 is four, forms positive swirl channel, it is ensured that rotation connecting rod 16, connection variable buckle 17,
Axial diversion piece 18 and rotation 19 synchronous forward of sand washing head rotation.
Before going into the well, after top connection internal screw thread is connect with the external screw thread of coiled tubing bottom end, starting pump truck makes liquid stream from continuous
Positive outflow in oil pipe, liquid stream realize fluid diversion after tool, and band power driven tools lower end rotates, and realize the effect of rotation sand washing.
Coiled tubing salvages special-shaped junk tool using the resilient clamping force of steel part after steel pipe fluting, salvages irregular junk
Corner angle.The difficulty simultaneously while salvaged can not be rinsed by husky bury by solving junk.Coiled tubing rotation sand flushing tool is adopted
The mode carried with rotation jarring and high local flow velocities.Gradually remove the grains of sand near intercommunicating pore.Reduce the resistance of annular space sand card.
Process using junk and solution tubing string sand card special-shaped in coiled tubing fishing oil pipe of the invention, including with
Lower step：
Step 1 salvages special-shaped junk tool using coiled tubing tail band coiled tubing, pulls the junk on sand plug face out；
Step 2 rotates sand flushing tool using coiled tubing tail band coiled tubing, and rotation sweeps away blocking in releasing pipe；
If step 3 still cannot release sand card outside tubing string after sweeping away, perforated using tubing string；
After step 4, tubing string perforation, percussion paragraph by paragraph is carried out up and down with the coiled tubing of coiled tubing tail band rotation sand flushing tool
The mode of sand washing, gradually activation blocking outer tunnel, washes out wild card sand；
Step 5, the former well casing column of activity, reach tubing string unfreezing；
Step 6, the replacement complete well of tubing string tripping in are produced.
Specifically, carrying out in accordance with the following steps：
Step 1, it salvages and sand flushing tool prepares；
Step 2, coiled tubing corollary equipment assembles；
Step 3, scouring equipment prepares：15m3Circulating tank one, vibrating screen one, oil pipe filter one, 700 type pump trucks
One.
Step 4, lower coiled tubing+safety joint+fishing socket, which rinses, salvages, and pressurize 40-50KN.It is irregularly fallen until pulling out
Object.
Coiled tubing rotation sand flushing tool (inward turning) carries out in accordance with the following steps：
Step 1, lower cable tail band perforating gun perforation poling operation.
Step 2, it is normal to interview to connection rotation sand washing head (2, nozzle × 3 3mm, 4mm nozzle) spray head rotation.Lower company
Continuous oil pipe to perforated interval, reciprocating activity coiled tubing direct circulation sand-flushing washes out the sand accumulated in annular space.
Step 3, coiled tubing out is played, tears coiled tubing injection head open.Examination proposes movable tubing string activity unfreezing, until rising all
Stuck pipe column.
Process of the invention solves current oil-water well channel blockage, is unable to the operating condition that normal circulation sweeps away de-plugging, leads to
It crosses the salvaging of tripping in coiled tubing band and sand-flushing pipe column implements tubing string unfreezing operation：1, the time is saved.Save replacement overhaul troop
With the time required for equipment.2, risk is reduced.As long as ensure that discharge capacity when coiled tubing sand washing, manipulator is experienced, puts down
Hilllock personnel observation is sat in place in steady operation, outlet, and technical staff commander is proper, and the risk of construction is far smaller than conventional set milling and applies
Work.3, construction cost is reduced.The reciprocating sand washing of coiled tubing handles sand card, saves equipment, personnel's replacement and overhaul construction institute
The cost needed.
Component, structure and the process that the present embodiment does not describe in detail belong to the well-known components of the industry and commonly use knot
Structure or conventional process method are not describing one by one here.
In conclusion the contents of the present invention are not limited in the above embodiments, the knowledgeable people in same area can
Can propose other embodiments easily within technological guidance's thought of the invention, but this embodiment is included in this hair
Within the scope of bright.
Claims (5)
1. a kind of process using junk and solution tubing string sand card special-shaped in coiled tubing fishing oil pipe, which is characterized in that
Include the following steps：
Step 1 salvages special-shaped junk tool using coiled tubing tail band coiled tubing, pulls the junk on sand plug face out；
Step 2 rotates sand flushing tool using coiled tubing tail band coiled tubing, and rotation sweeps away blocking in releasing pipe；
If step 3 still cannot release sand card outside tubing string after sweeping away, perforated using tubing string；
After step 4, tubing string perforation, carry out tapping sand washing paragraph by paragraph up and down with coiled tubing tail band coiled tubing rotation sand flushing tool
Mode, gradually activation blocking outer tunnel, washes out wild card sand；
Step 5, the former well casing column of activity, reach tubing string unfreezing；
Step 6, the replacement complete well of tubing string tripping in are produced；
The coiled tubing rotates sand flushing tool, including top connection (11), cover cylinder (12), rotation connecting rod (16), connection variable buckle
(17), sand washing head (19) are rotated, coiled tubing is connected by screw thread with top connection (11) top, and top connection (11) lower part passes through spiral shell
Line is connected with cover cylinder (12), and cover cylinder (12) is a circular cylinder body, and there is stepped hole in cover cylinder (12) bottom end, rotates the upper of connecting rod (16)
The centre of upper bearing (metal) (13) and lower bearing (14) that portion is mounted on cover cylinder (12) inner wall is simultaneously suspended in cover cylinder (12), rotation connection
The lower thread end of bar (16) is pierced by the stepped hole of cover cylinder (12) bottom end, makes rotation connecting rod (16) can the rotation in cover cylinder (12)
Turn, the lower thread end of rotation connecting rod (16) is connected by spiral shell button with the top for connecting variable buckle (17), connection variable buckle (17)
Bottom is connect by screw thread with rotation sand washing head (19), is formed and is rotated integrally sand flushing tool, in the lower part of rotation sand washing head (19)
Outer wall is formed with multiple groups jet stream pore channels (15), sets in rotation sand washing head (19) upper inside wall close to connection variable buckle (17)
It is equipped with multiple axial diversion pieces (18).
2. according to claim 1 using junk special-shaped in coiled tubing fishing oil pipe and the technique side for solving tubing string sand card
Method, which is characterized in that the coiled tubing salvages special-shaped junk tool, including top connection (1), salvaging connecting tube (3), outer cylinder
(6), shoes (7) are guided, top connection (1) is a cylinder, and upper and lower end inner wall has internal screw thread, upper end internal screw thread and coiled tubing bottom
The nipple at end connects, and lower end internal screw thread is connect with the external screw thread for salvaging connecting tube (3) upper end, and salvaging connecting tube (3) is one
Cylinder, the cylinder body outer wall for salvaging connecting tube (3) lower half are axially provided with two perforation seams (4) for penetrating into bottom end,
Multiple interior briar tooths (5) are provided with along the edge of two perforation seams salvaging connecting tube (3) inner wall, and interior briar tooth (5) tooth tip is to axle center
Interior receipts make to salvage connecting tube (3) lower half and interior briar tooth (5) high resilience, convenient for opening and interior tightening, salvaging connecting tube (3)
The bottom end face of inner wall is formed with inner chamfer, is provided with outer cylinder (6) on the outside of connecting tube (3) salvaging, and the upper end of outer cylinder (6) is solid
It is scheduled on top connection (1), lower end is fixed with guiding shoes (7), stays between the inner wall of outer cylinder (6) and the outer wall for salvaging connecting tube (3)
Having makes to salvage the flexible annular space in connecting tube (3) lower half.
3. according to claim 2 using junk special-shaped in coiled tubing fishing oil pipe and the technique side for solving tubing string sand card
Method, which is characterized in that the top connection (1) is integrated with outer cylinder (6) by welding surface (2) integral solder；Salvaging connecting tube (3)
Inner wall is provided with 3 interior briar tooths (5) along the edge of every perforation seam (4)；The perforation seam (4), which is located at, salvages connecting tube (3)
The both ends of same diameter are formed.
4. according to claim 1 using junk special-shaped in coiled tubing fishing oil pipe and the technique side for solving tubing string sand card
Method, which is characterized in that the top connection (11) is a cylinder, and upper end inner wall has internal screw thread, and lower part outer wall has external screw thread, top connection
(11) upper end internal screw thread is connect with the nipple of coiled tubing bottom end, top connection (11) lower external thread and cover cylinder (12) top
The internal screw thread of inner wall is connected, and axial diversion piece (18) is welded as a whole with rotation sand washing head (19).
5. according to claim 1 using junk special-shaped in coiled tubing fishing oil pipe and the technique side for solving tubing string sand card
Method, which is characterized in that the axial diversion piece (18) is four, forms positive swirl channel, it is ensured that rotation connecting rod (16) connects
Connect variable buckle (17), axial diversion piece (18) and rotation sand washing head (19) synchronous forward rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610970068.1A CN106368640B (en) | 2016-10-28 | 2016-10-28 | Using the process of junk and solution tubing string sand card special-shaped in coiled tubing fishing oil pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610970068.1A CN106368640B (en) | 2016-10-28 | 2016-10-28 | Using the process of junk and solution tubing string sand card special-shaped in coiled tubing fishing oil pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106368640A CN106368640A (en) | 2017-02-01 |
| CN106368640B true CN106368640B (en) | 2018-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610970068.1A Active CN106368640B (en) | 2016-10-28 | 2016-10-28 | Using the process of junk and solution tubing string sand card special-shaped in coiled tubing fishing oil pipe |
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| CN (1) | CN106368640B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661579B (en) * | 2017-03-27 | 2023-12-12 | 中国石油化工股份有限公司 | Telescopic continuous sand washing device and method |
| CN111502547B (en) * | 2020-05-29 | 2021-06-11 | 中国石油天然气集团有限公司 | Jet flow adjusting method for rotary guide downhole unfreezing |
| CN115162992A (en) * | 2022-06-30 | 2022-10-11 | 中石化石油工程技术服务有限公司 | Small-diameter pipe column cutting and fishing integrated fishing device and method |
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|---|---|---|---|---|
| CN2731085Y (en) * | 2004-01-05 | 2005-10-05 | 辽河石油勘探局 | Hydraulic self-feeding speed adjustable rotary sand flushing deblocking device |
| CN201486500U (en) * | 2009-08-13 | 2010-05-26 | 戚喻晓 | Multifunctional overshot |
| CN202417377U (en) * | 2012-01-06 | 2012-09-05 | 张文胜 | Multifunctional oil field underground salvage device |
| CN104747112A (en) * | 2013-12-31 | 2015-07-01 | 贵州高峰石油机械股份有限公司 | Method for fishing fishes buried by silt and fishing spear of method |
| CN205036334U (en) * | 2015-09-07 | 2016-02-17 | 中国石油化工股份有限公司 | Down -hole junk fishing barrel |
| CN205089267U (en) * | 2015-10-23 | 2016-03-16 | 中石化石油工程技术服务有限公司 | Coiled tubing salvages a section of thick bamboo |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150136398A1 (en) * | 2013-11-19 | 2015-05-21 | Smith International, Inc. | Retrieval tool and methods of use |
-
2016
- 2016-10-28 CN CN201610970068.1A patent/CN106368640B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2731085Y (en) * | 2004-01-05 | 2005-10-05 | 辽河石油勘探局 | Hydraulic self-feeding speed adjustable rotary sand flushing deblocking device |
| CN201486500U (en) * | 2009-08-13 | 2010-05-26 | 戚喻晓 | Multifunctional overshot |
| CN202417377U (en) * | 2012-01-06 | 2012-09-05 | 张文胜 | Multifunctional oil field underground salvage device |
| CN104747112A (en) * | 2013-12-31 | 2015-07-01 | 贵州高峰石油机械股份有限公司 | Method for fishing fishes buried by silt and fishing spear of method |
| CN205036334U (en) * | 2015-09-07 | 2016-02-17 | 中国石油化工股份有限公司 | Down -hole junk fishing barrel |
| CN205089267U (en) * | 2015-10-23 | 2016-03-16 | 中石化石油工程技术服务有限公司 | Coiled tubing salvages a section of thick bamboo |
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| CN106368640A (en) | 2017-02-01 |
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Effective date of registration: 20210901 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. 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 Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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