CN106351603B - A kind of crack or solution cavity severe leakage blocking method and plugging material are sent into pipe string - Google Patents
A kind of crack or solution cavity severe leakage blocking method and plugging material are sent into pipe string Download PDFInfo
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- CN106351603B CN106351603B CN201610712622.6A CN201610712622A CN106351603B CN 106351603 B CN106351603 B CN 106351603B CN 201610712622 A CN201610712622 A CN 201610712622A CN 106351603 B CN106351603 B CN 106351603B
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- plugging material
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- running tool
- loose
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- 239000000463 material Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000000903 blocking effect Effects 0.000 title claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 210000002445 nipple Anatomy 0.000 claims abstract description 19
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000011049 filling Methods 0.000 claims description 7
- 230000008961 swelling Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 3
- 238000006703 hydration reaction Methods 0.000 claims description 3
- 239000002981 blocking agent Substances 0.000 claims description 2
- 238000011068 loading method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- JBJWASZNUJCEKT-UHFFFAOYSA-M sodium;hydroxide;hydrate Chemical compound O.[OH-].[Na+] JBJWASZNUJCEKT-UHFFFAOYSA-M 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 239000000230 xanthan gum Substances 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention discloses a kind of crack or solution cavity severe leakage blocking method and plugging material is sent into pipe string, and this approach includes the following steps：1) tripping in running tool；Its ontology is tubular, and upper end is equipped with pressure check valve by screw thread and casing connection, lower end；Plugging material is packed into the chamber body of casing and running tool；Plugging material is the mixture of bridge formation adminicle, water-swellable plugging material and shear-thickening liquid；2) cannula tip is connect with orifice plate pipe nipple, and orifice plate pipe nipple is connect by crossover sub with drilling rod；Inertia insulating liquid is filled in 1~2 drilling rod adjacent with orifice plate pipe nipple；Plugging slurry is filled in remaining drilling rod；3) when will be fed under tool to well loss zone's location, turn on pump circulation opens the valve plate of pressure check valve, and plugging material enters lost-circulation zone, and bridge formation adminicle is put up a bridge, and water-swellable plugging material expansion, plugging slurry blocks；4) outlet pipe string is played.This method uses multiple leak stopping, and effect is obvious, practical.
Description
Technical field
The present invention relates to drilling technology fields, and in particular to a kind of crack or solution cavity severe leakage blocking method and leak stopping
Material is sent into pipe string.
Background technique
Leakage is the borehole problems frequently encountered in Process of Oil Well Drilling, it not only influence drillng operation it is normal into
Row, and other types of underground problem is often derived, the ill effects such as well slough, bit freezing or blowout are resulted even in, greatly
Amplitude improves drilling cost.Currently, the probability that leakage occurs in drillng operation is 10% or so, and severe well leakage loss accounts for leakage
50% or more of total losses.By taking middle Petroleum Group company as an example, 24.83 ten thousand sides, loss are missed in generation in 2013 leakage 1878 times
2007.92 days, the loss time accounted for the 59.38% of complicated loss.If circulation problems not can effectively solve, construction week certainly will be extended
Phase influences reservoir exploration, development progress, increases exploration, development cost；Hydrocarbon contamination is caused, exploration, development effectiveness are influenced.
It is endangered in view of brought by leakage, each major company has researched and developed bridge joint plugging material, chemical plugging agent, height
Various news plugging material, the leak-proof leak-stopping technologies such as dehydration sealing agent, uniaxial pressure sealer and various leak stopping thick slurrys obtain
It is fast-developing.But large fracture, even solution cavity are missed, and are always the maximum challenge of leakage stopping technology.Crack or solution cavity are serious
Leakage, conventional plugging material and leaking-stopping measure are substantially invalid.Currently, the domestic and international effective ways still without solution severe mud losses,
Only by experience and (ten several times, Ji Shici, even up to a hundred times repetitions) blocking construction is repeated several times, expend a large amount of plugging materials and
Time cost, and leak stopping success rate is not also high.
Application No. is 201010212911.2 " methods of drilling spot plugging ", and disclosing one kind can targetedly determine
The method of point leak stopping meets conventional leak stopping, expandable plugging additives timing can also be transported to leakage formation location, but simultaneously
It how is not involved with for crack or the progress leak stopping of solution cavity severe leakage, and plugging material running tool is to plugging material
Size have certain limitation, bulky grain solid material can not be smoothly sent into shaft bottom, and zero may be left in shaft bottom
Part influences subsequent drilling operation.
Application No. is mention one in 201110310611.2 " a kind of sealing agent and configuration method for severe mud losses "
Kind is used for the sealing agent of severe mud losses, can block drop ply, crush resistance strength is big, and the resistance to salinity ability of heatproof is strong, suitable for boring
Large fracture leak stopping is carried out during well.But also without involving how to carry out leak stopping for crack or solution cavity severe leakage,
And how plugging material is sent into drop ply.
Summary of the invention
In order to targetedly solve the problems, such as crack or solution cavity severe leakage, the present invention provides a kind of crack or solution cavity
Property severe leakage blocking method and plugging material be sent into pipe string, under the premise of wellbore stability, into drop ply launch can play frame
The flexible or rigid solid of bridge plugging action, then the plugging material of water-swellable is put into, dual leak stopping, effect is obvious, practicability
By force.
For this purpose, technical scheme is as follows：
A kind of crack or solution cavity severe leakage blocking method, include the following steps：
1) the tripping in running tool into well；The running tool is tubular, and by screw thread and casing connection, lower end is set for upper end
There is pressure check valve；Plugging material is packed into the body interior of casing and running tool；
The plugging material is the mixture of bridge formation adminicle, water-swellable plugging material and shear-thickening liquid；The frame
Bridge adminicle can form plugged zone in crack or solution cavity bridging；
When the pressure check valve reaches the pressure-bearing limit, valve plate is opened, inside stuffing leaks out, into well；
2) it is connect at the top of described sleeve pipe with orifice plate pipe nipple, the orifice plate pipe nipple is connect by crossover sub with drilling rod；With
Inertia insulating liquid is filled in 1~2 adjacent drilling rod of orifice plate pipe nipple；Plugging slurry is filled in remaining drilling rod；
3) when by well loss zone's location is arrived under the running tool, turn on pump circulation is enough to open the running tool wait be pumped
When the valve plate of the pressure check valve of bottom, plugging material enters lost-circulation zone, enters crack or solution cavity under pressure, builds bridge auxiliary
Object is helped to put up a bridge, water-swellable plugging material expansion, plugging slurry blocks；
4) outlet pipe string is played.
Further, casing described in step 1) has more, is successively end-to-end, inside filling plugging material.
Further, bridge formation adminicle described in step 1) be the items such as rubber wheel mole, coir rope section, wooden unit, cotton yarn, cloth,
Block；The water-swellable plugging material is hydration swelling material；It is in bridge formation adminicle behind crack or solution cavity bridging
Gradually water swelling keeps plugged zone finer and close, to improve leak stopping success rate.
The shear-thickening liquid be it is a kind of be allowed to be thickened by hydrophthalmia shear action and block the mixture blocking agent of drop ply, mainly
As inner cavity filling medium, first is that can poising tool external and internal pressure；Second is that after itself and mud mixing, under low velocity shear effect,
It can significantly thicken, plugging material can be swept along to enter in stratum, improve leak stopping success rate.
The inertia insulating liquid is a kind of anhydrous or extremely low water content solution, is prevented in the drilling fluid in kelly bar
Moisture content enter in plugging material, react with the plugging material of water-swellable, lead to premature inflation.
Further, the pressure check valve includes valve plate, pin shaft, determines loose-leaf, dynamic loose-leaf and torsionspring；It is described to determine loose-leaf
It is fixed at the side of the running tool bottom, the dynamic loose-leaf is fixed on valve plate；Pin shaft passes through torsionspring
It connects and described determines loose-leaf, dynamic loose-leaf.
A kind of plugging material is sent into pipe string, be connected in turn from top to bottom drilling rod, crossover sub, orifice plate pipe nipple, casing and
Running tool；The running tool is tubular, and bottom is equipped with pressure check valve；The running tool and cannula cavity are filled with stifled
Leak material；The plugging material is the mixture of bridge formation adminicle, water-swellable plugging material and shear-thickening liquid；With it is described
Inertia insulating liquid is filled in 1~2 adjacent drilling rod of orifice plate pipe nipple；Plugging slurry is filled in remaining drilling rod.
This method, can be in the premise of wellbore stability mainly for crack or the plugging operations of solution cavity severe leakage well
Under, the flexible or rigid solid and water-swellable plugging material of larger size are launched effectively into drop ply, in the soft of larger size
Property or rigid solid build bridge block and water-swellable plugging material expansion, enrich joint filling dual measure under leak stopping, plugged zone
It is finer and close.Not only save the cost, plugging effect is significant, and practicability is stronger, and easy to operate, safe and reliable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that plugging material provided by the invention is sent into pipe string；
Fig. 2 a is the main view for being sent into pipe string；
Fig. 2 b is the right view for being sent into pipe string.
Specific embodiment
Technical solution of the present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in Fig. 1,2a, 2b, a kind of plugging material feeding pipe string is connected with drilling rod, crossover sub in turn from top to bottom
1, orifice plate pipe nipple 2, casing 3 and running tool 4；4 ontology of running tool is tubular, and bottom is equipped with pressure check valve 9；Running tool
4 and 3 lumen loading of casing have plugging material；Plugging material is bridge formation adminicle, water-swellable plugging material and shear-thickening liquid
Mixture；Inertia insulating liquid is filled in 1~2 drilling rod adjacent with orifice plate pipe nipple 2；Leak stopping mud is filled in remaining drilling rod
Slurry.Orifice plate pipe nipple 2 is not only flow channels, but also can effectively prevent and return on bulky grain plugging material.It is preferred that the pressure list
Include valve plate 11, pin shaft 7, determine loose-leaf 6, dynamic loose-leaf 10 and torsionspring 12 to valve 9；It is described determine loose-leaf 6 by screw 5 fixation set
It sets in the side of 4 body bottom portion of running tool, the dynamic loose-leaf 10 is fixed on valve plate 11 by screw 5；Pin shaft 7
It is connected across torsionspring 12 and described determines loose-leaf 6, dynamic loose-leaf 10.The contact surface of valve plate 11 and running tool is the conical surface, the two it
Between be equipped with sealing element 13.It is further preferred that the internal diameter of running tool cavity top and bottom is identical but axle center is different, it is intermediate smoothed
It crosses, is conducive to plugging material discharge.
The method that pipe string carries out crack or solution cavity severe leakage leak stopping, including following step are sent into using above-mentioned plugging material
Suddenly：
1) the tripping in running tool 4 into well；The running tool 4 is tubular, and upper end is connect by screw thread with casing 3, under
End is equipped with pressure check valve 9；Plugging material is packed into the body interior of casing 3 and running tool 4；
The plugging material is the mixture of bridge formation adminicle, water-swellable plugging material and shear-thickening liquid；The frame
Bridge adminicle can form plugged zone in crack or solution cavity bridging；It is preferred that bridge formation adminicle is rubber wheel mole, coir rope section, wood
The items such as block, cotton yarn, cloth, block.The water-swellable plugging material is hydration swelling material, is being split in bridge formation adminicle
Gradually water swelling after seam or solution cavity bridging, keeps plugged zone finer and close, to improve leak stopping success rate.The shear-thickening
Liquid is the xanthan gum that 0.5-1% is added in conventional mud.
When the pressure check valve 9 reaches the pressure-bearing limit, valve plate 11 is opened, inside stuffing leaks out, into well；
2) 3 top of described sleeve pipe is connect with orifice plate pipe nipple 2, and the orifice plate pipe nipple 2 is connect by crossover sub 1 with drilling rod；
Inertia insulating liquid is filled in 1~2 drilling rod adjacent with orifice plate pipe nipple 2；Plugging slurry is filled in remaining drilling rod；It is described lazy
Sexual isolation liquid can use waste diesel or white oil.
3) when by well loss zone's location is arrived under the running tool 4, turn on pump circulation is enough to open the running tool wait be pumped
When the valve plate 11 of the pressure check valve 9 of 4 bottoms, plugging material enters lost-circulation zone, enters crack or solution cavity, frame under pressure
Bridge adminicle is put up a bridge, and water-swellable plugging material expansion, plugging slurry blocks；
4) outlet pipe string is played.
In practical engineering applications, water-swellable plugging material main component is water-swellable resin, content 80%-
90%, the size of resin adjusts as needed.The BZ- of Bohai Sea drilling project Institute for Research and Technology production can be selected in specific
STAIII.Water-swellable plugging material is mainly by bentonite, methylene-bisacrylamide, crosslinking agent, initiator and NaOH water
Solution mixing system after heating is cooling, is cut into the fritter of suitable size, is then placed in baking oven at block elastomeric, drying and
It is made.
According to different use conditions, the dosage of required plugging material is determined by calculation, selects more casings, successively head
Tail connection, inside filling plugging material, is used with meeting scene.
Wherein, the shear-thickening liquid is that a kind of mixture for being allowed to thickening by hydrophthalmia shear action and blocking drop ply is stifled
Agent, mainly as inner cavity filling medium, first is that can poising tool external and internal pressure；Second is that after itself and mud mixing, in low velocity shear
It under effect, can significantly thicken, plugging material can be swept along to enter in stratum, improve leak stopping success rate.
The inertia insulating liquid is a kind of anhydrous or extremely low water content solution, is prevented in the drilling fluid in kelly bar
Moisture content enter in plugging material, react with the plugging material of water-swellable, lead to premature inflation.
This method is directed to crack or solution cavity severe leakage well, can effectively throw into drop ply under the premise of wellbore stability
The flexible or rigid solid (bridge formation auxiliary material) and water-swellable plugging material for putting larger size, larger size flexibility or
Rigid solid (bridge formation auxiliary material) bridge formation blocks and water-swellable plugging material expands, blocks up under the dual measure of substantial joint filling
Leakage, plugged zone are finer and close.Not only save the cost, plugging effect is significant, and practicability is stronger, and easy to operate, safe and reliable.
Claims (5)
1. a kind of crack or solution cavity severe leakage blocking method, it is characterised in that include the following steps：
1) tripping in running tool (4) into well；The running tool (4) is tubular, and upper end is connect by screw thread with casing (3),
Lower end is equipped with pressure check valve (9)；Plugging material is packed into the body interior of casing (3) and running tool (4)；
The plugging material is the mixture of bridge formation adminicle, water-swellable plugging material and shear-thickening liquid；The bridge formation is auxiliary
Help object that can form plugged zone in crack or solution cavity bridging；
It when the pressure check valve (9) reaches the pressure-bearing limit, opens valve plate (11), inside stuffing leaks out, into well；
The pressure check valve (9) includes valve plate (11), pin shaft (7), determines loose-leaf (6), dynamic loose-leaf (10) and torsionspring (12)；
The side determined loose-leaf (6) and be fixed at the running tool (4) body bottom portion, the dynamic loose-leaf (10) are fixed at
On valve plate (11)；Pin shaft (7) pass through torsionspring (12) connection it is described determine loose-leaf (6), move loose-leaf (10)；
2) it is connect at the top of described sleeve pipe (3) with orifice plate pipe nipple (2), the orifice plate pipe nipple (2) is connected by crossover sub (1) and drilling rod
It connects；Inertia insulating liquid is filled in 1~2 drilling rod adjacent with orifice plate pipe nipple (2)；Plugging slurry is filled in remaining drilling rod；
3) when by well loss zone's location is arrived under the running tool (4), turn on pump circulation is enough to open the running tool wait be pumped
(4) when valve plate (11) of the pressure check valve (9) of bottom, plugging material enters lost-circulation zone, under pressure enter crack or
Solution cavity, bridge formation adminicle are put up a bridge, and water-swellable plugging material expansion, plugging slurry blocks；
4) outlet pipe string is played.
2. crack as described in claim 1 or solution cavity severe leakage blocking method, it is characterised in that：Casing described in step 1)
(3) there are more, be successively end-to-end, inside filling plugging material.
3. crack as described in claim 1 or solution cavity severe leakage blocking method, it is characterised in that：It builds bridge described in step 1)
Adminicle is rubber wheel mole, coir rope section, wooden unit, cotton yarn or cloth.
4. crack as described in claim 1 or solution cavity severe leakage blocking method, it is characterised in that：The water-swellable leak stopping
Material is hydration swelling material；The shear-thickening liquid is a kind of to be allowed to be thickened by hydrophthalmia shear action and block the mixing of drop ply
Object blocking agent.
5. a kind of plugging material is sent into pipe string, it is connected with drilling rod, crossover sub (1), orifice plate pipe nipple (2), set in turn from top to bottom
Manage (3) and running tool (4)；Running tool (4) ontology is tubular, and bottom is equipped with pressure check valve (9)；The feeding work
Tool (4) and casing (3) lumen loading has plugging material；The plugging material be bridge formation adminicle, water-swellable plugging material and
The mixture of shear-thickening liquid；Inertia insulating liquid is filled in 1~2 drilling rod adjacent with the orifice plate pipe nipple (2)；Remaining is bored
Plugging slurry is filled in bar；The pressure check valve (9) includes valve plate (11), pin shaft (7), determines loose-leaf (6), dynamic loose-leaf (10)
With torsionspring (12)；The side determined loose-leaf (6) and be fixed at the running tool (4) body bottom portion, the dynamic work
Page (10) is fixed on valve plate (11)；Pin shaft (7) pass through torsionspring (12) connection it is described determine loose-leaf (6), move loose-leaf
(10)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610712622.6A CN106351603B (en) | 2016-08-24 | 2016-08-24 | A kind of crack or solution cavity severe leakage blocking method and plugging material are sent into pipe string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610712622.6A CN106351603B (en) | 2016-08-24 | 2016-08-24 | A kind of crack or solution cavity severe leakage blocking method and plugging material are sent into pipe string |
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| Publication Number | Publication Date |
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| CN106351603A CN106351603A (en) | 2017-01-25 |
| CN106351603B true CN106351603B (en) | 2018-11-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111075393A (en) * | 2019-12-18 | 2020-04-28 | 中国石油天然气股份有限公司 | Oil-gas field casing damage well long well section plugging resin repair process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111197469B (en) * | 2018-11-16 | 2023-06-06 | 中石化石油工程技术服务有限公司 | Well drilling plugging device and method |
| CN110185412B (en) * | 2019-05-24 | 2020-11-13 | 中国石油大学(北京) | Downhole plugging device |
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| US8307916B1 (en) * | 2007-02-27 | 2012-11-13 | Wald H Lester | Controlling fluid loss in oil and gas wells |
| CN101532600A (en) * | 2008-03-13 | 2009-09-16 | 中国石化集团胜利石油管理局钻井工艺研究院 | Method for leak stoppage of solid expansion pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111075393A (en) * | 2019-12-18 | 2020-04-28 | 中国石油天然气股份有限公司 | Oil-gas field casing damage well long well section plugging resin repair process |
| CN111075393B (en) * | 2019-12-18 | 2021-11-30 | 中国石油天然气股份有限公司 | Oil-gas field casing damage well long well section plugging resin repair process |
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| Publication number | Publication date |
|---|---|
| CN106351603A (en) | 2017-01-25 |
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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: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |