CN106223858B - Symmetric form monotubular twin-well surface pipe drilling completion device and operating method - Google Patents
Symmetric form monotubular twin-well surface pipe drilling completion device and operating method Download PDFInfo
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- CN106223858B CN106223858B CN201610788058.6A CN201610788058A CN106223858B CN 106223858 B CN106223858 B CN 106223858B CN 201610788058 A CN201610788058 A CN 201610788058A CN 106223858 B CN106223858 B CN 106223858B
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- casing
- casings
- tubing string
- well
- pit shaft
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- 238000005553 drilling Methods 0.000 title claims abstract description 31
- 238000011017 operating method Methods 0.000 title abstract description 5
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011083 cement mortar Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- 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)
- Earth Drilling (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The present invention provides symmetric form monotubular twin-well surface pipe drilling completion device and operating methods, belong to a game clock layer casing drilling completion field, including the conduit in well head slot region is arranged, it is pit shaft in the conduit, the pit shaft is vertically arranged, the upper surface of the conduit is equipped with horizontally disposed diplopore pedestal, the diplopore pedestal is equipped with the first pilot hole and the second pilot hole, A casings tubing string is vertically arranged in by first pilot hole in the pit shaft, and B casings tubing string is vertically arranged in by second pilot hole in the pit shaft；The A casings tubing string is identical with the radius of B casing tubing strings, and the central axes of the A casings tubing string and the relatively described pit shaft of B casings tubing string are uniformly arranged.The present invention is easy to operate, solves the problems, such as that platform slot is insufficient and can not cmpletely develop reservoir, improves well head slot service efficiency, increase the cloth well density of unit area.
Description
Technical field
The invention belongs to field of oil drilling, are related to a game clock layer casing drilling completion field more particularly to symmetric form list
Cylinder twin-well surface pipe drilling completion device and operating method.
Background technology
Oil, geological drilling wellbore construction operation in, under normal conditions carry out monotubular individual well be drilled well operations, be exactly
In one pit shaft then tripping in surface pipe is cemented the well, and it is deep then to continue in being drilled into completion in surface pipe, after lower protective casing
Well cementation, then continues to be drilled into completion well depth and be cemented the well in protective casing, and this is China's brill that most of drilling well uses at present
Well mode.
Artificial end island is generally built in China pole neritic area, the mode that cluster well is generally bored on manually end island develops position
Oil field in pole neritic area, but man-made island builds that cost is higher, and well head resource is relatively fewer, to make full use of man-made island well head
Resource, it is necessary to increase the cloth well density of unit area.
Invention content
In view of this, the present invention is directed to propose a kind of reduction operating cost, saving well head slot, increase unit area well spacing are close
Degree, the symmetric form monotubular twin-well surface pipe drilling completion device and operating method of advantageous fully exploitation reservoir.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：Symmetric form monotubular twin-well surface pipe bores
Well completion system, including the conduit that is arranged in well head slot region are pit shaft in the conduit, and the pit shaft is vertically arranged, institute
The upper surface for stating conduit is equipped with horizontally disposed diplopore pedestal, and the diplopore pedestal is equipped with the first pilot hole and second and is oriented to
Hole, A casings tubing string are vertically arranged in by first pilot hole in the pit shaft, and B casings tubing string passes through described second
Pilot hole is vertically arranged in the pit shaft；
The A casings tubing string is identical with the radius of B casing tubing strings, the A casings tubing string and B casing tubing string phases
The central axes of the pit shaft are uniformly arranged.
Further, the A casings tubing string is located at the length in the pit shaft more than the B casings tubing string described
Length in pit shaft is 2~4m.
Further, the A casings tubing string and B casing tubing strings are integral joint casing.
Further, the A casings tubing string and B casing tubing strings are that box cupling is all polished the set of chamfering at 45 ° up and down
Pipe.
Further, the upper end of the A casings tubing string is equipped with the first circular arc chamfering, the upper end of the B casings tubing string
Equipped with the second circular arc chamfering.
Use the method for the symmetric form monotubular twin-well surface pipe drilling completion device, it is characterised in that：
The first step：Drilling, taking high rotating speed, gently pressure hangs up and beats measure；
Second step：Setting of casing, setting of casing correct the concentricity of well head slot 1 and pit shaft 7 in time in the process；
Third walks：Well cementation, cycle well cementation is carried out using B casings tubing string 5, injects cement mortar 8 from A casings tubing string 4 is interior
Afterwards, it is returned out outside A casings tubing string 4 and B casings tubing string 5,5 float collar of B casings tubing string is a small amount of to be had to enter into setting of casing
Cement mortar, after cement injection, turn on pump top leads to B casings tubing string 5, then slowly bleeds off pressure, makes a small amount of cement mortar from B well sets
At pipe shoe in sleeve pipe, cement Hou Ning is complete；
4th step：The casing head of A casings tubing string 4 and B casings tubing string 5 is installed, is torn open after pre-hardening 6h and gets rid of concentric reducer 10, cut
Cone hangs up part, then installs casing head.
Further, cased step is that a) box cupling is polished by A casings tubing string 4 and B casings tubing string 5 up and down
45 ° of chamferings, and prepare two double public casings, a 11m, a 10m ensure under casing head to prevent cone from hanging without box cupling in 10m
Position is not accomplished；B) well head is corrected after installing the casing head of A casings tubing string 4；C) well head stays people to observe during setting of casing, set
Pipe box cupling notifies driller when crossing casing head, lowering velocity is controlled, if the big Mobile derrick school of well head deviation is good；D) A casings tubing string 4
Under open concentric reducer 10 afterwards on earth, cover well head；E) same mode by under B casings tubing string 5 in place；F) small displacement top is logical follows
Ring prepares well cementation.
Compared with prior art, the invention has the advantages and positive effects that：The present invention utilizes a bite casing simultaneously
To double parallel casing cementing technologies, spuds in two and crept into towards respective direction with different kickoff point (KOP)s in, to reach from single
Notch bores the purpose of two mouthfuls of wells, while using the difference in height of A casings tubing string and B casing tubing strings, ensureing life between each wellbore
Production does not interfere with each other, and solves the problems, such as that platform slot is insufficient and can not cmpletely develop reservoir, improves the use of well head slot
Efficiency increases the cloth well density of unit area, easy to operate, has the characteristics that reduce operating cost, saves well head slot, on land
It is applicable in terms of holding island and marine drilling platform drilling well tool.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of symmetric form monotubular twin-well surface pipe drilling completion device of the present invention；
Fig. 2 is structural schematic diagram of the A casings tubing string head of the present invention after installation is complete；
Fig. 3 is to open concentric reducer afterwards on earth under A casings tubing string of the present invention, covers the structural schematic diagram of well head；
Fig. 4 is the structural schematic diagram after A casings tubing string and B casing tubing string upper end cutting of the present invention；
Fig. 5 is structural schematic diagram of the casing head of A casings tubing string and B casing tubing string of the present invention after installation is complete.
Reference sign：
1- well head slots；2-A well well heads；3-B well well heads；4-A casing tubing strings；The first circular arc chamferings of 41-；5-B casings
Tubing string；The second circular arc chamferings of 51-；6- conduits；7- pit shafts；8- cement mortars；9- diplopore pedestals；The first pilot holes of 91-；92- second
Pilot hole；10- concentric reducers；11- casing heads.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To express or implicitly include one or more this feature.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in Figure 1, the present invention is symmetric form monotubular twin-well surface pipe drilling completion device, including fixed set in well head
Conduit 6 in 1 region of slot, interior conduit 6 is pit shaft 7, and pit shaft 7 is vertically arranged, and the upper surface of conduit 6 is equipped with horizontally disposed diplopore
Pedestal 9, diplopore pedestal 9 are equipped with the first pilot hole 91 and the second pilot hole 92, and A casings tubing string 4 passes through the first pilot hole 91
It is vertically arranged in pit shaft 7, is A well well heads in A casings tubing string 4, B casings tubing string 5 is set vertically by the second pilot hole 92
It sets in pit shaft 7, is B well well heads in B casings tubing string 5, A casings tubing string 4 is identical with the radius of B casings tubing string 5, A wells
Casing tubing string 4 and B casings tubing string 5 are uniformly arranged with respect to the central axes of pit shaft 7, using a bite casing simultaneously to double parallel sets
Pipe cementing technology is spudded in two and is crept into towards respective direction with different kickoff point (KOP)s in, and two mouthfuls are bored to reach from single notch
The purpose of well solves the problems, such as that platform slot is insufficient and can not cmpletely develop reservoir, improves well head slot service efficiency,
Increase the cloth well density of unit area.
Preferably, A casings tubing string 4 is located at the length in pit shaft 7 and is more than length of the B casings tubing string 5 in pit shaft 7
2~4m, preferably 2~3m, advantageously ensure that produce between each wellbore and do not interfere with each other.
Preferably, A casings tubing string 4 and B casings tubing string 5 be integral joint casing or box cupling polish up and down it is at 45 °
The casing of chamfering avoids interfering with each other problem during two serial parallel casing tripping in.
Preferably, the upper end of A casings tubing string 4 is equipped with the first circular arc chamfering 41, and the upper end of B casings tubing string 5 is equipped with the
Two circular arc chamferings 51 are conducive to coordinate with casing head 11, are not easy to the operator that damages, promote safety.
It in actual operating process, is operated in strict accordance with following steps, the first step：Drilling first has to ensure well
The verticality that eye bores advantageously ensures that A casings tubing string 4 and B casings tubing string 5 are smoothly lower to position, high rotating speed is taken gently to press
Measure is hung up and beaten, has prevented the hole deviation, drilling tool specification from being：Φ 444.5mm gear wheels × 0.40m+730/630 connectors × 1.14m+ Φ
558mm reamers × 1.39m+ Φ 203mm are without magnetic × 9.34m+ Φ 203mm drill collars × 54.99m+631/410 connectors × 1.14m+
Φ 127mm drilling rods, surface seawater drilling, so short after finishing drilling remove drifting and fully recycle, are squeezed into due to drill pipe annulus flow velocity bottom
The old well drilling fluid of 100 sides, trip-out setting of casing；Second step：Setting of casing, casing specification are 244.5mm, a) A casings tubing string 4 and B
Casing tubing string 5 polishes box cupling chamfering at 45 ° up and down, and prepares two double public casings, and a 11m, a 10m ensure
Without box cupling in 11 times 10m of casing head, prevents cone from hanging and do not accomplish position；B) as shown in Fig. 2, installing the casing head of A casings tubing string 4
Well head is corrected after 11；C) well head stays people to observe during setting of casing, and casing coupling notifies driller when crossing casing head 11, under control
Speed is put, if the big Mobile derrick school of well head deviation is good；D) as shown in figure 3, opening concentric reducer 10 afterwards on earth under A casings tubing string 4,
Cover well head；E) same mode by under B casings tubing string 5 in place；F) the logical cycle in small displacement top prepares well cementation；Third walks：Gu
Well, A casings tubing string 4 and B casings tubing string 5 times deep poor 2~3m, preferably 3m, using B casings tubing string 5 recycle solid
Well is pumped into 68.5m as common surface casing cementing3Cement mortar praises G grades of ash 99t of China, replaces 13m3, cement returns to ground, average close
Spend 1.88g/cm3Cementing operation is normal, the 4th step：The casing head 11 of A casings tubing string 4 and B casings tubing string 5, initial set are installed
It is torn open after 6h and gets rid of concentric reducer 10, cut cone and hang up part, as shown in figure 4, being sliced off from plane on diplopore pedestal 9 up 17mm, in A wells
The first circular arc chamfering 41 of upper end polishing of casing tubing string 4, in the second circular arc chamfering 51 of the upper end of B casings tubing string 5 polishing, then
After casing is installed, after installation is complete as shown in Figure 5.It is and common during carrying out the surface pipe well cementing operation of monotubular twin-well
It is returned out outside A casings tubing string 4 and B casings tubing string 5 after injection cement mortar 8 out of A casings tubing string 4 unlike well, is
Ensure that the complete pressure testing of energy, 5 float collar of B casings tubing string are a small amount of to be had to enter into setting of casing when 5 pipe string two of B casings tubing string is opened
Cement mortar, after cement injection, turn on pump top leads to B casings tubing string 5, then slowly bleeds off pressure, makes a small amount of cement mortar from B casings
At shoes in sleeve pipe, cement Hou Ning is complete to can be completed symmetric form monotubular twin-well surface layer drilling completion technique.
One embodiment of the present invention has been described in detail above, but the content be only the present invention preferable implementation
Example should not be construed as limiting the practical range of the present invention.It is all according to all the changes and improvements made by the present patent application range
Deng should all still fall within the scope of the patent of the present invention.
Claims (6)
1. using the method for symmetric form monotubular twin-well surface pipe drilling completion device, it is characterised in that：
The first step：Drilling, taking high rotating speed, gently pressure hangs up and beats measure；
Second step：Setting of casing, setting of casing correct well head slot in time in the process（1）With pit shaft（7）Concentricity；
Third walks：Well cementation, uses B casing tubing strings（5）Cycle well cementation is carried out, from A casing tubing strings（4）Interior injection cement mortar
（8）Afterwards, along A casing tubing strings（4）With B casing tubing strings（5）It returns out outside, B casing tubing strings（5）Float collar is with must in setting of casing
A small amount of cement mortar must be entered, after cement injection, turn on pump top leads to B casing tubing strings（5）, then slowly bleed off pressure, make a small amount of
Cement mortar is from sleeve pipe, cement Hou Ning is complete from B casing shoes；
4th step：A casing tubing strings are installed（4）With B casing tubing strings（5）Casing head（11）, tear open after pre-hardening 6h and get rid of concentric reducer
（10）, cut cone and hang up part, then casing head is installed（11）；
Symmetric form monotubular twin-well surface pipe drilling completion device, including be arranged in well head slot（1）Conduit in region（6）, institute
State conduit（6）Interior is pit shaft（7）, the pit shaft（7）It is vertically arranged, the conduit（6）Upper surface be equipped with it is horizontally disposed double
Hole pedestal（9）, the diplopore pedestal（9）It is equipped with the first pilot hole（91）With the second pilot hole（92）, A casing tubing strings（4）
Pass through first pilot hole（91）It is vertically arranged in the pit shaft（7）It is interior, B casing tubing strings（5）It is oriented to by described second
Hole（92）It is vertically arranged in the pit shaft（7）It is interior；
The A casings tubing string（4）With B casing tubing strings（5）Radius it is identical, the A casings tubing string（4）With B casings
Tubing string（5）The relatively described pit shaft（7）Central axes be uniformly arranged.
2. the method according to claim 1 using symmetric form monotubular twin-well surface pipe drilling completion device, feature
It is：Cased step is a）A casing tubing strings（4）With B casing tubing strings（5）Box cupling is polished up and down chamfering at 45 °,
And preparing two double public casings, a 11m, a 10m ensure casing head（11）Without box cupling in lower 10m, prevents cone from hanging and do not
In place；B) A casing tubing strings are installed（4）Casing head（11）Well head is corrected afterwards；C) well head stays people to see during setting of casing
It examines, casing coupling crosses casing head（11）Shi Tongzhi driller controls lowering velocity, if the big Mobile derrick school of well head deviation is good；d) A
Casing tubing string（4）Under open concentric reducer afterwards on earth（10）, cover well head；E) same mode is by B casing tubing strings（5）Under
In place；F) the logical cycle in small displacement top prepares well cementation.
3. the method according to claim 1 using symmetric form monotubular twin-well surface pipe drilling completion device, feature
It is：The A casings tubing string（4）Positioned at the pit shaft（7）Interior length is more than the B casings tubing string（5）In the well
Cylinder（7）Interior length is 2~4m.
4. the method according to claim 1 using symmetric form monotubular twin-well surface pipe drilling completion device, feature
It is：The A casings tubing string（4）With B casing tubing strings（5）For integral joint casing.
5. the method according to claim 1 using symmetric form monotubular twin-well surface pipe drilling completion device, feature
It is：The A casings tubing string（4）With B casing tubing strings（5）It is that box cupling is all polished the casing of chamfering at 45 ° up and down.
6. the method according to claim 1 using symmetric form monotubular twin-well surface pipe drilling completion device, feature
It is：The A casings tubing string（4）Upper end be equipped with the first circular arc chamfering（41）, the B casings tubing string（5）Upper end set
There is the second circular arc chamfering（51）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788058.6A CN106223858B (en) | 2016-08-31 | 2016-08-31 | Symmetric form monotubular twin-well surface pipe drilling completion device and operating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788058.6A CN106223858B (en) | 2016-08-31 | 2016-08-31 | Symmetric form monotubular twin-well surface pipe drilling completion device and operating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106223858A CN106223858A (en) | 2016-12-14 |
| CN106223858B true CN106223858B (en) | 2018-09-18 |
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| CN201610788058.6A Active CN106223858B (en) | 2016-08-31 | 2016-08-31 | Symmetric form monotubular twin-well surface pipe drilling completion device and operating method |
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| CN (1) | CN106223858B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145275A (en) * | 2019-05-13 | 2019-08-20 | 中国石油集团渤海钻探工程有限公司 | Bore well-completing process in occupy-place drilling tool method monotubular twin-well surface layer |
| CN110714737B (en) * | 2019-11-09 | 2023-06-20 | 中为(上海)能源技术有限公司 | Well cementation system and method for underground coal gasification process |
| CN115126418B (en) * | 2022-08-30 | 2022-12-09 | 东营市昆昆科技有限责任公司 | Drilling method for drilling multiple boreholes based on one borehole site |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5560435A (en) * | 1995-04-11 | 1996-10-01 | Abb Vecto Gray Inc. | Method and apparatus for drilling multiple offshore wells from within a single conductor string |
| US6142235A (en) * | 1996-12-05 | 2000-11-07 | Abb Vetco Gray Inc. | Bottom-supported guidance device for alignment of multiple wellbores in a single conductor |
| CN202417384U (en) * | 2011-12-29 | 2012-09-05 | 江苏金石机械集团有限公司 | Single-bore dual-well wellhead devices |
| CN202755939U (en) * | 2012-07-26 | 2013-02-27 | 江苏金石科技有限公司 | Integral type casing head single-barrel twin-well well head device |
| CN202900041U (en) * | 2012-11-21 | 2013-04-24 | 江苏金石科技有限公司 | Occupied drilling tool for single-barrel multi-well |
| CN203499620U (en) * | 2013-07-29 | 2014-03-26 | 中国海洋石油总公司 | Wellhead annular plate for single-shaft twin-well well drilling and well cementing |
| CN103352673B (en) * | 2013-07-30 | 2016-03-02 | 中国海洋石油总公司 | Monocular twin-well surface layer well cementation technology |
| CN203584359U (en) * | 2013-11-27 | 2014-05-07 | 江苏金石机械集团有限公司 | Asymmetric casing head for two-in-one drilling wellhead |
| CN203905884U (en) * | 2014-05-19 | 2014-10-29 | 江苏金石科技有限公司 | Base for two-in-one drilling technology |
| CN206129159U (en) * | 2016-08-31 | 2017-04-26 | 中国石油集团渤海钻探工程有限公司 | Single twin -well surface casing well drilling well completion device on symmetry type |
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2016
- 2016-08-31 CN CN201610788058.6A patent/CN106223858B/en active Active
Also Published As
| Publication number | Publication date |
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| CN106223858A (en) | 2016-12-14 |
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Effective date of registration: 20211027 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: No.106 Huanghai Road, Binhai New Economic and Technological Development Zone, Tianjin 300457 Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |