CN107524426B - Fill tubing string - Google Patents
Fill tubing string Download PDFInfo
- Publication number
- CN107524426B CN107524426B CN201710819282.1A CN201710819282A CN107524426B CN 107524426 B CN107524426 B CN 107524426B CN 201710819282 A CN201710819282 A CN 201710819282A CN 107524426 B CN107524426 B CN 107524426B
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- China
- Prior art keywords
- tubing string
- filling
- central tube
- inner tube
- sliding sleeve
- 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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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
Abstract
Disclosed herein is a kind of filling tubing strings, and filling tubing string includes outer tubing string and interior tubing string, and interior tubing string is mounted in outer tubing string；Outer tubing string includes being sequentially connected the top packer connect, filling sliding sleeve, screen casing and insertion sealing from top to bottom；Interior tubing string includes central tube, inner tube and the setting tool with ball seat set gradually from top to bottom, the packing tool with filling channel, tests blocking seat, the anti-drip valve with resilient sleeve, sliding sleeve switch instrument, sealed bottom, packing tool tests blocking seat and anti-drip valve is sequentially arranged in central tube, and sliding sleeve switch instrument is mounted on central tube.The structure of the filling tubing string more simplification, does not need two layers of washing pipe, does not need locator, and it is easy to operate, safety greatly improves, and the internal diameter of outer tubing string can greatly increase, be conducive to carry out subsequent demixing injection-production technology, can be realized the function of the packing tool of the relevant technologies.
Description
Technical field
Present document relates to but be not limited to stowage unit field, espespecially a kind of filling tubing string and a kind of placement method.
Background technique
Existing packing tool often uses single multilayer to fill, and top packer, isolation packing is usually arranged in outer tubing string
Device, sump packer, insertion sealing, filling sliding sleeve, sealing drum and positioning box cupling etc., interior tubing string is usually arranged setting tool, fills
Fill out tool, locator, sliding sleeve switch instrument, anti-suction valve, combination sealing and double-deck washing pipe etc., using two layers of washing pipe, entire oil
Well need to once penetrate out all intervals, and packing tool one plows tripping in, fills from level to level from bottom to up, mutual not shadow between each filling layer
It rings, although saving the activity duration, interior tubing string and outer tubular column structure are complicated, and operation difficulty is big, careless slightly to will result in sand card
Accident greatly increases operating risk.
Summary of the invention
At least one of in order to solve the above-mentioned technical problem, there is provided herein a kind of filling tubing string, structure is simpler
Reduction does not need two layers of washing pipe, does not need locator, and easy to operate, and safety greatly improves, and the internal diameter of outer tubing string can
It greatly increases, is conducive to carry out subsequent demixing injection-production technology, can be realized the function of the packing tool of the relevant technologies.
In order to reach this paper purpose, there is provided herein a kind of filling tubing string, including outer tubing string and interior tubing string, said inner tube columns
It is mounted in the outer tubing string；The outer tubing string includes being sequentially connected the top packer connect, filling sliding sleeve, screen casing from top to bottom
It is sealed with insertion；Said inner tube column include central tube, inner tube and the setting tool with ball seat set gradually from top to bottom,
With filling channel packing tool, test blocking seat, the anti-drip valve with resilient sleeve, sliding sleeve switch instrument, sealed bottom, it is described
Inner tube is located in the central tube, and the setting tool is connected to the upper end of the central tube, the sealed bottom is connected to institute
State the lower end of central tube, the packing tool described tests blocking seat and the anti-drip valve is sequentially arranged in the central tube, simultaneously
Top in said inner tube, the sliding sleeve switch instrument are mounted on the lower section on the central tube and being in said inner tube；Its
In, the upper end of said inner tube has the first fit structure matched with the anti-drip valve, and first fit structure can jack up
Valve ball in the anti-drip valve has between the central tube and the outer tubing string and limits to moving up and down for said inner tube
The second fit structure, be provided with third through-hole and fourth hole on the central tube, the third through-hole is located at the bottom
Between sealing and the sliding sleeve switch instrument, the fourth hole is located at the top of the top packer.
Optionally, the filling tubing string further include: baffle is tested between blocking seat and the anti-drip valve positioned at described, and institute
It states and is provided with first through hole on baffle.
Optionally, the filling tubing string further include: sump packer is connected with insertion sealing.
Optionally, the packing tool has axial passage and radial passage, the axial passage and the radial passage
Independently of each other, the axial passage along the slurries filtered out after the screen casing filter gravel that said inner tube column flows for will return
It is back to ground, the radial passage is used to enter the filling sliding sleeve for load fluid in filling.
Optionally, described test on blocking seat is provided with shear pin, and the shear pin is tested for testing blocking seat described in confession
Seal the top packer.
Optionally, first fit structure is extension protruding upward, and the extension separably protrudes into described
In anti-drip valve, the second through-hole is provided on the side wall of the extension.
Optionally, second fit structure include be arranged at intervals up and down it is inwardly protruded in the outer tubing string
Boss and elastic card claw, elastic card claw are set in resilient sleeve, and elasticity is set on the central tube and is worn by pin
It crosses the central tube and is connected with said inner tube.
The present invention also provides a kind of placement methods, comprising:
Step 102, tripping in and sump packer is set；
Step 104, tripping in and interior tubing string and outer tubing string are installed, drilling rod is connect with interior tubing string, and insertion sealing is inserted into sand setting
In the mandrel of packer；
Step 106, it sets top packer and tests envelope, setting tool is made to give up with top packer, and mark filling position
It sets with reversing position and reacting cycle goes out the setting ball in setting tool；
Step 108, gravel packing operations are carried out；
Step 110, reacting cycle well-flushing is carried out after the completion of filling；
Step 112, tubing string in rising.
Optionally, the step 106 sets top packer and tests envelope, setting tool is made to give up with top packer, and
The step of label filling position and reversing position and reacting cycle go out the setting ball in setting tool are as follows: filling tubing string is lowered into position
Afterwards, setting position is marked in well head, throws setting ball and wait for that setting ball is located on the ball seat of setting tool, drilling rod, which is suppressed, reaches setting
When pressure, top packer is set；It is suppressed from annular space, pressure passes through setting tool and blocking seat is tested in packing tool arrival, tests envelope
Interior tubing string is above mentioned after qualification, setting tool and top packer is made to slip out of the hand, and continues above to mention interior tubing string the filling until packing tool
Channel reaches top packer or more, and in well head label reversing position, simultaneously reacting cycle goes out setting ball；In the annular space of setting position
It suppresses to destroy and tests blocking seat, restore unimpeded in central tube.
Optionally, the step of step 108, progress gravel packing operations are as follows: interior tubing string is put to setting position and applied
It adds and determines tonnage load to carry out packing job.
Optionally, the step 110, after the completion of filling the step of progress reacting cycle well-flushing are as follows: after there is sand-out pressure, ring
Sky applies certain pressure, above mentions interior tubing string to reversing position, continues above to mention after annular pressure decline, until elastic card claw and position
Boss in top cooperates so that resilient sleeve stopping moves up, and the valve ball of anti-drip valve, which is against on valve seat, opens lost circulation prevention function,
Then mortar remaining in reacting cycle cleaning drilling rod is until cleaning liquid returns to ground.
Compared with prior art, filling tubing string provided by the invention, structure more simplification, does not need two layers of washing pipe,
Locator is not needed, and be easy to operate, safety greatly improves, and the internal diameter of outer tubing string can greatly increase, and is conducive to carry out
Subsequent demixing injection-production technology, can be realized the function of the packing tool of the relevant technologies.
The other feature and advantage of this paper will illustrate in the following description, also, partly become from specification
It is clear that by implementing to understand herein.The purpose of this paper and other advantages can be by specifications, claims
And specifically noted structure is achieved and obtained in attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand this paper technical solution, and constitutes part of specification, with this Shen
Embodiment please is used to explain the technical solution of this paper together, does not constitute the limitation to this paper technical solution.
Fig. 1 is the schematic cross-sectional view of filling device described in one embodiment of the invention；
Fig. 2 is the flow chart of fill method described in one embodiment of the invention.
Wherein, the corresponding relationship in Fig. 1 between appended drawing reference and component names are as follows:
1 top packer, 2 filling sliding sleeves, 3 screen casings, 4 insertion sealings, 5 sump packers, 6 setting tools, 7 stowers
Tool, 8 test blocking seat, and 9 anti-drip valves, 10 sliding sleeve switch instruments, 11 sealed bottoms, 12 central tubes, 13 inner tubes, 14 baffles, 15 extend
Pipe, 16 elastic card claws, 17 boss, 18 annular spaces, 19 fourth holes, 20 third through-holes.
Specific embodiment
For the purposes, technical schemes and advantages of this paper are more clearly understood, below in conjunction with attached drawing to the reality of this paper
Example is applied to be described in detail.It should be noted that in the absence of conflict, the spy in embodiment and embodiment in the application
Sign can mutual any combination.
Many details are explained in the following description in order to fully understand herein, still, can also be adopted herein
Implemented with other than the one described here mode, therefore, the protection scope of this paper is not by following public specific implementation
The limitation of example.
The filling tubing string and placement method of some embodiments herein are described with reference to the accompanying drawing.
Filling tubing string provided herein, as shown in Figure 1, including outer tubing string and interior tubing string, said inner tube column is mounted on described
In outer tubing string；The outer tubing string includes being sequentially connected the top packer 1 connect, filling sliding sleeve 2, screen casing 3 and insertion from top to bottom
Sealing 4；Said inner tube column include central tube 12, inner tube 13 and the setting tool 6 with ball seat set gradually from top to bottom,
With filling channel packing tool 7, test blocking seat 8, the anti-drip valve 9 with resilient sleeve, sliding sleeve switch instrument 10, sealed bottom
11, said inner tube 13 is located in the central tube 12, and the setting tool 6 is connected to the upper end of the central tube 12, the bottom
The lower ends that portion's sealing 11 is connected to the central tube 12, the packing tool 7 described test blocking seat 8 and the anti-drip valve 9 successively
It is mounted in the central tube 12 and is in the top of said inner tube 13, the sliding sleeve switch instrument 10 is mounted on the center
On the pipe 12 and lower section in said inner tube 13；Wherein, the upper end of said inner tube 13 has and matches with the anti-drip valve 9
First fit structure, first fit structure can jack up the valve ball in the anti-drip valve 9, the central tube 12 and the outer tube
There is the second fit structure limited that moves up and down to said inner tube 13 between column, be provided with third on the central tube
Through-hole 20 and fourth hole 19, the third through-hole 20 between the sealed bottom 11 and the sliding sleeve switch instrument 10,
The fourth hole 19 is located at the top of the top packer 1.
Setting tool 6 can set top packer 1, and packing tool 7 provides filling channel and (also cries: liquid-filled steering
Runner, including radial passage and axial passage, radial passage be connected on central tube 12 and with communicated outside central tube 12), and
The outside of packing tool 7 is equipped with sealing ring up and down, tests blocking seat 8 for testing envelope top packer 1, anti-drip valve 9 and is used for reacting cycle
When prevent hydraulic slip to stratum.
Filling tubing string provided by the invention, structure more simplification, does not need two layers of washing pipe, does not need locator, and
Easy to operate, safety greatly improves, and the internal diameter of outer tubing string can greatly increase, and is conducive to carry out subsequent demixing injection-production skill
Art can be realized the function of the packing tool 7 of the relevant technologies.
Wherein, as shown in Figure 1, the filling tubing string further include: baffle 14 tests blocking seat 8 and the leakproof positioned at described
Between valve 9, and first through hole is provided on the baffle 14, described test on blocking seat 8 is provided with shear pin, the shearing
Pin tests the envelope top packer 1 for testing blocking seat 8 described in supplying, and tests after the completion of envelope and continues pressurization and cut shear pin to make to test
Testing blocking and testing envelope for blocking seat 8 is seated on following baffle 14, tests blocking seat 8 including testing blocking and testing envelope seat.
Furthermore as shown in Figure 1, the filling tubing string further include: sump packer 5 is connected with insertion sealing 4,
The structure of the dirt sand packer is identical as the structure of the top packer 1.
Further, the packing tool 7 has axial passage and radial passage, and the axial passage and the radial direction are logical
Road is mutually indepedent, and the axial passage is used for the slurry filtered out after 3 filter gravel of screen casing that will be flowed along said inner tube column
Liquid is back to ground, and the radial passage is used to enter the filling sliding sleeve 2 for load fluid in filling, and load fluid includes gravel
And slurries.
Specifically, first fit structure is extension 15 protruding upward, and the extension 15 separably protrudes into
In the anti-drip valve 9, the second through-hole is provided on the side wall of the extension 15, extension 15 pushes up the valve ball in anti-drip valve 9
When, the second through-hole is connected to top pipeline section and lower section pipeline section of the central tube 12 at anti-drip valve 9, and extension 15 is detached from downwards anti-drip valve
When 9, valve ball, which is fallen on the valve seat of anti-drip valve 9, closes anti-drip valve 9, top pipeline section and lower section of the central tube 12 at anti-drip valve 9
Pipeline section truncation.
Specifically, second fit structure include be arranged at intervals up and down it is inwardly protruded in the outer tubing string
Boss 17 and elastic card claw 16, elastic card claw 16 are set in resilient sleeve, and elasticity is set on the central tube 12 and leads to
It crosses pin to be connected together across the central tube 12 with said inner tube 13, correspondence offers guide groove on central tube 12
Hole, the boss 17 on top and the boss 17 of lower part are used to limit elastic card claw 16.
Anti-drip valve 9 has the extension 15 of the second through-hole of band, and valve ball is located on extension 15 when anti-drip valve 9 is inactive,
Second lead to the hole site is higher than the valve seat of anti-drip valve 9, top pipeline section and lower section pipeline section phase mutual conductance of the central tube 12 at anti-drip valve 9
It is logical；When completion gravel filling progress reacting cycle needs to start anti-drip valve 9, above mentioning interior tubing string makes elastic card claw 16 be located at top
Boss hinder and stop moving up upwards, the abjection anti-drip valve 9 downwards of extension 15 causes valve ball to be located on valve seat, realizes anti-
Prevent hydraulic slip to stratum when circulation.
Wherein, sliding sleeve 2 is openable is turned on and off cut-off for filling.
Placement method provided by the invention, as shown in Figure 2, comprising:
Step 102, tripping in and sump packer 5 is set；
Step 104, tripping in and interior tubing string and outer tubing string are installed, drilling rod is connect with interior tubing string, and it is heavy that insertion sealing 4 is inserted into
In the mandrel of sand packer 5；
Step 106, it sets top packer 1 and tests envelope, setting tool 6 is made to give up with top packer 1, and mark filling
Simultaneously reacting cycle goes out the setting ball in setting tool 6 for position and reversing position；
Step 108, gravel packing operations are carried out；
Step 110, reacting cycle well-flushing is carried out after the completion of filling；
Step 112, after the completion of reacting cycle, act interior tubing string.
Placement method provided by the invention, greatly reduces building block, does not also need the double-deck washing pipe, does not need positioning and connects
Hoop and locator pass through one layer of outer tubing string on insertion 4 tiebacks of sealing after completing one layer of filling, and constantly superposition realization multi-section multi-layer fills
It fills out.
Specifically, the step 106 sets top packer 1 and tests envelope, loses setting tool 6 with top packer 1
Hand, and the step of marking filling position and reversing position and reacting cycle to go out the setting ball in setting tool 6 are as follows: filling tubing string 7
After tripping in place, setting position is marked in well head, setting ball is thrown and waits for that setting ball is located on the ball seat of setting tool 6, drilling rod is beaten
When pressure reaches setting pressure, top packer 1 is set；It is suppressed from annular space 18, pressure enters central tube 12, warp from third through-hole 20
It crosses setting tool 6 and blocking seat 8 is tested in the arrival of packing tool 7, above mention interior tubing string after testing sealing lattice, seal setting tool 6 and top
It slips out of the hand every device 1, continues above to mention interior tubing string until the filling channel of packing tool 7 reaches 1 or more top packer, in well head mark
Note reversing position and reacting cycle go out setting ball, and (liquid enters in packing tool 7 in annular space 18 from interconnection, and ejection is sat
Blocking)；It suppresses to destroy in setting position annular space 18 and tests blocking seat 8, restore unimpeded in central tube 12.
Specifically, the step of step 108, progress gravel packing operations are as follows: interior tubing string is put to setting position and applied
It adds and determines tonnage load to carry out packing job.
Specifically, the step 110, after the completion of filling the step of progress reacting cycle well-flushing are as follows: after there is sand-out pressure, ring
Sky 18 applies certain pressure, above mentions interior tubing string to reversing position, continues above to mention after the decline of 18 pressure of annular space, until elastic card claw
16 cooperate with the boss 17 being located above so that resilient sleeve stopping moves up, and the valve ball of anti-drip valve 9, which is against on valve seat, makes lost circulation prevention
Function is opened, and then mortar remaining in reacting cycle cleaning drilling rod is until cleaning liquid returns to ground, and interconnection is at this time
The top of top packer 1.
In conclusion filling tubing string provided by the invention, structure more simplification, do not need two layers of washing pipe, do not need
Locator, and it is easy to operate, safety greatly improves, and the internal diameter of outer tubing string can greatly increase, and is conducive to carry out subsequent
Demixing injection-production technology can be realized the function of the packing tool of the relevant technologies.
In description herein, term " installation ", " connected ", " connection ", " fixation " etc. be shall be understood in a broad sense, for example,
" connection " may be fixed connection or may be dismantle connection, or integral connection；It can be directly connected, can also lead to
Intermediary is crossed to be indirectly connected.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning herein.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of this paper
In example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or example.
Moreover, the particular features, structures, materials, or characteristics of description can be in any one or more of the embodiments or examples with suitable
Mode combine.
Although embodiment disclosed herein is as above, the content only implementation of use herein for ease of understanding
Mode is not limited to herein.Technical staff in any this paper fields, do not depart from spirit disclosed herein and
Under the premise of range, any modification and variation, but the patent protection model of this paper can be carried out in the form and details of implementation
It encloses, still should be subject to the scope of the claims as defined in the appended claims.
Claims (7)
1. a kind of filling tubing string, which is characterized in that including outer tubing string and interior tubing string, said inner tube column is mounted on the outer tubing string
It is interior；
The outer tubing string includes being sequentially connected the top packer connect, filling sliding sleeve, screen casing and insertion sealing from top to bottom；
Said inner tube column includes central tube, inner tube and the setting tool with ball seat set gradually from top to bottom, has and fill
The packing tool of fill channel tests blocking seat, the anti-drip valve with resilient sleeve, sliding sleeve switch instrument, sealed bottom, said inner tube position
In in the central tube, the setting tool is connected to the upper end of the central tube, the sealed bottom is connected to the center
The lower end of pipe, the packing tool described test blocking seat and the anti-drip valve is sequentially arranged in the central tube and in institute
The top of inner tube is stated, the sliding sleeve switch instrument is mounted on the lower section on the central tube and being in said inner tube；
Wherein, the upper end of said inner tube has the first fit structure matched with the anti-drip valve, first fit structure
The valve ball in the anti-drip valve can be jacked up, between the central tube and the outer tubing string have to said inner tube move up and down into
Second fit structure of row limit, is provided with third through-hole and fourth hole on the central tube, the third through-hole is located at institute
It states between sealed bottom and the sliding sleeve switch instrument, the fourth hole is located at the top of the top packer.
2. filling tubing string according to claim 1, which is characterized in that further include:
Baffle is tested between blocking seat and the anti-drip valve positioned at described, and is provided with first through hole on the baffle.
3. filling tubing string according to claim 1, which is characterized in that further include:
Sump packer is connected with insertion sealing.
4. filling tubing string according to any one of claim 1 to 3, which is characterized in that the packing tool has axial
Channel and radial passage, the axial passage and the radial passage are mutually indepedent, and the axial passage is used for will be along described interior
The slurries of tubing string flowing filtered out after the screen casing filter gravel are back to ground, and the radial passage is used to supply in filling
Load fluid enters the filling sliding sleeve.
5. filling tubing string according to any one of claim 1 to 3, which is characterized in that described test on blocking seat is provided with
Shear pin, the shear pin test the envelope top packer for testing blocking seat described in confession.
6. filling tubing string according to any one of claim 1 to 3, which is characterized in that first fit structure be to
The extension protruded above, the extension separably protrude into the anti-drip valve, and is provided on the side wall of the extension
Two through-holes.
7. filling tubing string according to any one of claim 1 to 3, which is characterized in that second fit structure includes
The inwardly protruded boss and elastic card claw, elastic card claw being arranged at intervals in the outer tubing string up and down are set to elasticity
It puts on, elasticity is set on the central tube and passes through the central tube by pin to be connected with said inner tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710819282.1A CN107524426B (en) | 2017-09-12 | 2017-09-12 | Fill tubing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710819282.1A CN107524426B (en) | 2017-09-12 | 2017-09-12 | Fill tubing string |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107524426A CN107524426A (en) | 2017-12-29 |
| CN107524426B true CN107524426B (en) | 2019-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710819282.1A Active CN107524426B (en) | 2017-09-12 | 2017-09-12 | Fill tubing string |
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| CN (1) | CN107524426B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042776B (en) * | 2018-10-11 | 2023-08-04 | 中国石油化工股份有限公司 | Anti-crossflow layered filling sand prevention pipe column and method |
| CN109630049B (en) * | 2018-11-09 | 2021-04-06 | 中国海洋石油集团有限公司 | Reverse circulation valve |
| CN110847874B (en) * | 2019-11-14 | 2022-02-11 | 中国海洋石油集团有限公司 | Fracturing filling and desanding pipe column and fracturing filling and desanding method |
| CN111734361A (en) * | 2020-07-01 | 2020-10-02 | 荆州市赛瑞能源技术有限公司 | Open-hole gravel packing sand prevention process and open-hole gravel packing sand prevention service pipe string |
| CN114427438B (en) * | 2020-10-12 | 2023-06-20 | 中国石油化工股份有限公司 | Multifunctional pressure testing device for shaft |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553595A (en) * | 1984-06-01 | 1985-11-19 | Texaco Inc. | Method for forming a gravel packed horizontal well |
| US7490669B2 (en) * | 2005-05-06 | 2009-02-17 | Bj Services Company | Multi-zone, single trip well completion system and methods of use |
| CN102134982B (en) * | 2011-02-11 | 2013-12-25 | 青岛瑞信石油设备制造有限公司 | Multilayer gravel packing method and tool |
| CN104879099B (en) * | 2015-04-28 | 2017-11-10 | 中国海洋石油总公司 | Gravel fills tubing string and gravel pack methods |
| CN104948145B (en) * | 2015-05-14 | 2017-12-19 | 胜利油田康贝石油工程装备有限公司 | A kind of oilfield horizontal well cased hole gravel packing construction method |
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2017
- 2017-09-12 CN CN201710819282.1A patent/CN107524426B/en active Active
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| CN107524426A (en) | 2017-12-29 |
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| CB02 | Change of applicant information |
Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Applicant after: China Offshore Oil Group Co., Ltd. Applicant after: China Oilfield Services Limited Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Applicant before: China National Offshore Oil Corporation Applicant before: China Oilfield Services Limited |
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