CN110130847A - Cable transmission underground gear type drilling tool - Google Patents
Cable transmission underground gear type drilling tool Download PDFInfo
- Publication number
- CN110130847A CN110130847A CN201910326272.3A CN201910326272A CN110130847A CN 110130847 A CN110130847 A CN 110130847A CN 201910326272 A CN201910326272 A CN 201910326272A CN 110130847 A CN110130847 A CN 110130847A
- Authority
- CN
- China
- Prior art keywords
- casing
- gear
- drilling tool
- hydraulic
- making drill
- 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.)
- Granted
Links
Classifications
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for anchoring the tools or the like
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/14—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for displacing a cable or cable-operated tool, e.g. for logging or perforating operations in deviated wells
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
Abstract
The invention belongs to petroleum gas completion technique fields, more particularly, to a kind of cable transmission underground gear type drilling tool, it is characterized by comprising the hole making drill assemblies being arranged in casing, the anchor being connected with this hole making drill assembly by suppressing connector, the hydraulic drive mechanism being connected respectively with hole making drill assembly and anchor, hole making drill assembly includes ontology, gland, jack-up piston on the body is set, the splined shaft that piston is connected is jacked up with this by connector sleeve, the milling head of splined shaft shaft end is set, the gear wheel being connected with splined shaft, the pinion gear being meshed with this gear wheel.The present invention is safe and environment-friendly, efficient, the wheeled tool for milling window in casing of electric gear suitable for producing well, the perforation in casing between stratum can be achieved, realize the radial level aperture of casing, not damaged to casing, pollution-free to stratum, construction efficiency is high, period is short, and tripping in of tool can realize multiple casing pipe hole opening operation.
Description
Technical field
The invention belongs to petroleum gas completion technique fields, more particularly, to a kind of cable transmission underground gear type aperture
Tool.
Background technique
Setting of casing cementing is needed to need borehole wall sealing to realize that reservoir hydrocarbons flow into the purpose of pit shaft after the completion of drilling well
Work hard in glove with the outer stratum of casing, cement sheath and nearly casing.It commonly works hard in glove with casing both at home and abroad at present and stratum mode is jet perforating
The shortcomings that mode, this mode is generation high temperature and pressure energy in perforating process, forms great impact to pit shaft, inevitably
Damage is formed to casing and cement sheath, reduces the intensity and service life of casing.And perforation will form compacting to surrounding formation
The permeability of effects reservoir, perforating fluid can also pollute surrounding formation.In addition, gunpowder and cumulative object that perforation uses belong to danger
Change product, storage and transportation cost are higher.In addition to this heat processing technique of perforation, also occur universal joint venting techniques in recent years, ten thousand
Milling aperture is carried out to casing using hydraulic motors driving universal shaft to section aperture, belongs to cold machining process.The technological merit is
Power is big, the disadvantage is that needing lower oil tube operation, it is also necessary to which pump truck coordinative construction, construction cost is higher, above has in application certain
Limitation.
Summary of the invention
The object of the present invention is to provide a kind of safe and environment-friendly, efficient cable transmission underground gear type drilling tools, realize
The radial level aperture of casing penetrates casing for producing well and provides a kind of new technological means.
The purpose of the present invention is what is realized by following technical proposals:
Cable transmission underground gear type drilling tool of the invention, it is characterised in that including the hole making drill being arranged in casing
Assembly, the anchor being connected with this hole making drill assembly by suppressing connector, respectively with the hole making drill assembly and anchor phase
The hydraulic drive mechanism of connection,
The hydraulic drive mechanism includes driving mechanism I and driving mechanism II, and the driving I includes micromotor,
The cable being connected with this micromotor, the hydraulic pump being connected with the micromotor are connected hydraulic with this hydraulic pump
Petroleum pipeline and oil return pipe on this hydraulic oil container is arranged in fuel tank, and the petroleum pipeline is connected with the anchor,
The driving mechanism II includes hydraulic motor, the triplate line being connected with this hydraulic motor, with this tee tube
The flow tube that road is connected, the telescoping ram being connected with the triplate line, the transmission shaft being connected with the hydraulic motor,
Pillar is equipped with outside the driving mechanism II,
The hole making drill assembly includes ontology, and the gland on this ontology is arranged in, and jack-up on the body is arranged
Piston jacks up the splined shaft that piston is connected with this by connector sleeve, the milling head of the splined shaft shaft end is arranged in, with the flower
The gear wheel that key axis is connected, the pinion gear being meshed with this gear wheel are arranged between the gland and gear wheel and divide
The rolling bearing not being connected with the gland with gear wheel, the jack-up piston pass through screw and the connector sleeve phase
Connection,
The transmission shaft is connected with the pinion gear,
It is equipped with several flow channels, including inlet opening and hole for back flow in the ontology, the inlet opening and described
Petroleum pipeline is connected, and the hole for back flow is connected with the oil return pipe.
The telescoping ram includes backup unit and righting unit.
Cartridge filter is equipped in the anchor, this cartridge filter includes inner barrel and outer barrel, is set between this inner barrel and outer barrel
There is hydraulic oil filtering net.
The inlet opening is equipped with throttle valve.
The gear wheel and pinion gear is bevel gear.
Advantages of the present invention:
(1) cable transmission underground gear type drilling tool of the invention, safe and environment-friendly, efficient, the electricity suitable for producing well
The wheeled tool for milling window in casing of movable tooth is realized the radial level aperture of casing, is outputed, it can be achieved that the interior perforation between stratum of casing
Eye diameter be not less than 30mm, eyelet is regular, not damaged to casing, and pollution-free to stratum, construction efficiency is high, and the period is short, fits
Aperture operation for a variety of grade of steels and wall thickness casing；Tripping in of tool can realize multiple casing pipe hole opening operation, be producing well
It penetrates casing and a kind of technological means is provided；
(2) cable transmission underground gear type drilling tool of the invention leans on cable transmission G.I.H, it is only necessary to logging winch
Cooperate with light maintenance working rig, easy construction, construction cost is low, and using electronic mode, operating efficiency is high, and tool performance is reliable, can
Complete the aperture operation to a variety of wall thickness casings of sizes；With going deep into for oil field development degree, which will be obtained more
To be widely applied.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of hole making drill assembly of the invention.
Fig. 3 is the structural schematic diagram of driving mechanism II of the invention.
Fig. 4 is windowing-process schematic diagram of the invention.
Specific embodiment
A specific embodiment of the invention is further illustrated with reference to the accompanying drawing.
As shown in Figs 1-4, cable transmission underground gear type drilling tool of the invention, it is characterised in that covered including setting
Hole making drill assembly 10 in pipe 13, with this hole making drill assembly 10 by suppressing the anchor 8 that connector 9 is connected, respectively with it is described
The hydraulic drive mechanism that hole making drill assembly 10 is connected with anchor 8,
The hydraulic drive mechanism includes driving mechanism I and driving mechanism II, and the driving I includes micromotor 2,
The cable 1 being connected with this micromotor 2, the hydraulic pump 3 being connected with the micromotor 2 are connected with this hydraulic pump 3
Petroleum pipeline 5 and oil return pipe 6 on this hydraulic oil container 4, the petroleum pipeline 5 and the anchor 8 is arranged in hydraulic oil container 4
It is connected,
The driving mechanism II includes hydraulic motor 11, the triplate line 17 being connected with this hydraulic motor 11, with this
The flow tube 15 that triplate line 17 is connected, the telescoping ram 12 being connected with the triplate line 17, with the hydraulic motor
11 transmission shafts 16 being connected are equipped with pillar 14 outside the driving mechanism II,
The hole making drill assembly 10 includes ontology 10-3, and the gland 10-9 on this ontology 10-3 is arranged in, and is arranged in institute
The jack-up piston 10-4 on ontology 10-3 is stated, the splined shaft 10-12 that piston 10-4 is connected is jacked up with this by connector sleeve 10-6,
The milling head 10-11 of the shaft end the splined shaft 10-12 is set, the gear wheel 10-13 being connected with the splined shaft 10-12, with
The pinion gear 10-7 that this gear wheel 10-13 is meshed, be arranged in it is between the gland 10-9 and gear wheel 10-13 and respectively with
The rolling bearing 10-10, the jack-up piston 10-4 that the gland 10-9 is connected with gear wheel 10-13 pass through screw
10-5 is connected with the connector sleeve 10-6,
The transmission shaft 16 is connected with the pinion gear 10-7,
Be equipped with several flow channels in the ontology 10-3, including inlet opening 10-1 and hole for back flow 10-8, it is described into
Fluid apertures 10-1 is connected with the petroleum pipeline 5, and the hole for back flow 10-8 is connected with the oil return pipe 6.
The telescoping ram 12 includes backup unit 12-1 and righting unit 12-2.
Cartridge filter 7 is equipped in the anchor 8, this cartridge filter 7 includes inner barrel and outer barrel, between this inner barrel and outer barrel
Equipped with hydraulic oil filtering net.
The inlet opening 10-1 is equipped with throttle valve 10-2.
The gear wheel 10-13 and pinion gear 10-7 is bevel gear.
The present invention is realized by following technical solution:
First by gear type drilling tool tripping in casing of the invention, by the decentralization of winch cable 1 to purpose depth, lead to
Automatically controlled mode is crossed, sends and instructs to downhole micro drilling tool control unit, underground direct current motor is driven hydraulic by retarder
3 work of pump, gets the hydraulic oil of certain pressure.Drilling tool is anchored on casing 13 by anchor 8, while hydraulic drive jacks up
Piston 10-4 is jacked up, so that milling head 10-11 radial level direction is stretched out, provides aperture bit pressure for milling head 10-11.Hydraulic drive is micro-
Type drilling tool lower end is equipped with hydraulic motor 11, and hydraulic motor 11 drives milling head 10-11 rotary cutting casing 13 by gear pair,
The miniature hole that diameter is about 35mm is outputed on casing 13, is jacked up piston 10-4 after the completion of windowing and is withdrawn under hydraulic action,
Milling head 10-11 is retracted in tool, so far completes a casing sidetracking operation.Depth, tool are transferred by adjusting winch cable 1
Tripping in can realize 13 windowing task of multiple casing of different depth.
Fluid power drilling tool upper end passes through halter connecting cable 1；Micromotor 2 and control unit peripheral hardware balance casing are used
In protection motor and component；Hydraulic pump 3 is by the hydraulic oil in sucking hydraulic oil container 4, by petroleum pipeline 5 by high pressure liquid pressure oil
It is delivered to hole making drill assembly 10, hole making drill assembly 10 can realize the aperture operation to casing 13 by hydraulic coupling.Anchor 8 has
Anchoring effect can realize anchoring drilling tool by beating high pressure；Cartridge filter 7 is set in anchor 8, cartridge filter 7 is by inner barrel and outer barrel
It forms, one layer of filter screen with certain mesh number of package between inner/outer tube plays the role of filtering hydraulic oil impurity；Suppress connector
The ontology 16 of 9 upper ends connection anchor 8, lower end and drilling tool is connected with socket head screw, and suppressing connector 9 can be aperture work
Have assembly and runner is provided.
10 structure of hole making drill assembly is as shown in Fig. 2, set a variety of flow channels, including inlet opening in the ontology 16 of hole making drill
10-1 and hole for back flow 10-8, hydraulic oil are reached by inlet opening 10-1 and jack up the bottom piston 10-4, jack up piston 10-4 hydraulic
Effect is lower to be jacked up, and provides aperture bit pressure for milling head 10-11.Inlet opening 10-1 sets throttle valve 10-2, adjusting piston thrust.It jacks up
Piston 10-4 is connect with connector sleeve 10-6 by screw 10-5, and splined shaft 10-12, splined shaft 10-12 are terminated on connector sleeve 10-6
With gear wheel 10-13 clearance fit, rolling bearing 10-10 is equipped between gear wheel 10-13 and gland 10-9, so that gear wheel
10-13 can be rotated along axis.The end splined shaft 10-12 connects milling head 10-11, so far realizes and jacks up piston 10-4 promotion spline
Axis 10-12 stretches out.After aperture, suppressing from the direction hole for back flow 10-8 (i.e. oil jacket annulus) can push jack-up piston 10-4 to receive
It returns, realizes the withdrawal of milling head 10-11.As shown in figure 3, hydraulic motor 11 provides power for aperture, hydraulic oil passes through inlet opening 10-
1, flow tube 15, triplate line 17 enter in hydraulic motor 11, and the power of hydraulic motor 11 passes through transmission shaft 16 and pinion gear 10-
This passes to milling head 10-11 by certain revolving speed proportion to bevel gear pair to 7 and gear wheel 10-13, and milling head 10-11 is in stable bit pressure
With the aperture operation perpendicular to 13 inner wall of casing achievable under revolving speed appropriate.
Embodiment
To 2000 meters of depth 5 1/2, " production string (N80, wall thickness 9.19) carries out aperture operation, first by 5 1/2 " apertures
The debugging of tool ground is completed, and out of well head tripping in casing, is transferred tool to purpose depth by winch cable 1, is passed through magnetic of logging well
Positioning calibration depth.Cable 1 is single-core cable, and tool controller is docked with cable 1, and ground is by controller to underground
Tool issues instruction, and electric signal is transmitted to control unit in tool by cable 1, and starting hydraulic pump 3 is just being suppressed from petroleum pipeline 5
10Mpa, operating tool string is anchored on casing 13 by 8 anchor fluke of the anchor stretching on tool, while hydraulic 11 work of horse of hydraulic drive
Make, drilling tool carries out casing 13 and opens a window.The time open a window generally in 5min, pump pressure declines 2Mpa when opening a window successfully, at this time pressure
Sensor receives feedback signal, and by changing, the realization of electromagnetic valve switch state is counter to suppress 10Mpa, promotion jack-up piston 10-4 times
It moves back, makes to open a window in milling head 10-11 retrieving tool, complete the windowing task in a hole.If you need to be carried out again at 1m on the first hole
Aperture operation after then operating 1 certain altitude of portable cable on winch and calibrating depth, repeats the first hole construction procedure, aperture
After portable cable 1 on winch, act the miniature drilling tool of gear type.
Cable transmission underground gear type drilling tool of the invention, it is safe and environment-friendly, efficient, suitable for the electronic of producing well
Gear type tool for milling window in casing is realized the radial level aperture of casing 13, is opened, it can be achieved that the interior perforation between stratum of casing 13
Eye diameter out is not less than 30mm, and eyelet is regular, not damaged to casing 13, pollution-free to stratum, and construction efficiency is high, the period
Short, suitable for a variety of grade of steels and wall thickness casing 13 aperture operation；Tripping in of tool can realize multiple 13 aperture operation of casing,
Casing 13 is penetrated for producing well, and a kind of technological means is provided；G.I.H is transmitted by cable 1, it is only necessary to logging winch and light maintenance operation
Machine cooperation, easy construction, construction cost is low, and using electronic mode, operating efficiency is high, and tool performance is reliable, achievable to a variety of
The aperture operation of a variety of wall thickness casings 13 of size；With going deep into for oil field development degree, which will obtain more extensive
Using.
Claims (5)
1. a kind of cable transmission underground gear type drilling tool, it is characterised in that including the hole making drill assembly being arranged in casing,
The anchor being connected with this hole making drill assembly by suppressing connector is connected with the hole making drill assembly and anchor respectively
Hydraulic drive mechanism,
The hydraulic drive mechanism includes driving mechanism I and driving mechanism II, and the driving I includes micromotor, with this
The cable that micromotor is connected, the hydraulic pump being connected with the micromotor, the hydraulic oil container being connected with this hydraulic pump,
Petroleum pipeline and oil return pipe on this hydraulic oil container are set, the petroleum pipeline is connected with the anchor,
The driving mechanism II includes hydraulic motor, the triplate line being connected with this hydraulic motor, with this triplate line phase
The flow tube of connection, the telescoping ram being connected with the triplate line, the transmission shaft being connected with the hydraulic motor are described
Driving mechanism II outside be equipped with pillar,
The hole making drill assembly includes ontology, and the gland on this ontology is arranged in, and jack-up piston on the body is arranged,
The splined shaft that piston is connected is jacked up with this by connector sleeve, the milling head of the splined shaft shaft end is set, with the splined shaft
The gear wheel being connected, the pinion gear being meshed with this gear wheel, be arranged in it is between the gland and gear wheel and respectively with
The rolling bearing that the gland is connected with gear wheel, the jack-up piston are connected by screw with the connector sleeve
It connects,
The transmission shaft is connected with the pinion gear,
Several flow channels, including inlet opening and hole for back flow, the inlet opening and the oil transportation are equipped in the ontology
Pipe is connected, and the hole for back flow is connected with the oil return pipe.
2. cable transmission underground gear type drilling tool according to claim 1, it is characterised in that the telescoping ram packet
Include backup unit and righting unit.
3. cable transmission underground gear type drilling tool according to claim 1, it is characterised in that in the anchor
Equipped with cartridge filter, this cartridge filter includes inner barrel and outer barrel, and hydraulic oil filtering net is equipped between this inner barrel and outer barrel.
4. cable transmission underground gear type drilling tool according to claim 1, it is characterised in that on the inlet opening
Equipped with throttle valve.
5. cable transmission underground gear type drilling tool according to claim 1, it is characterised in that the gear wheel and
Pinion gear is bevel gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910326272.3A CN110130847B (en) | 2019-04-23 | 2019-04-23 | Cable transmission downhole gear type tapping tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910326272.3A CN110130847B (en) | 2019-04-23 | 2019-04-23 | Cable transmission downhole gear type tapping tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110130847A true CN110130847A (en) | 2019-08-16 |
| CN110130847B CN110130847B (en) | 2021-08-06 |
Family
ID=67570674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910326272.3A Active CN110130847B (en) | 2019-04-23 | 2019-04-23 | Cable transmission downhole gear type tapping tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110130847B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114922581A (en) * | 2022-05-27 | 2022-08-19 | 重庆科技学院 | Underground casing continuous hole forming device and working method thereof |
| CN115405265A (en) * | 2022-07-06 | 2022-11-29 | 重庆科技学院 | Electrically-driven underground casing continuous hole drilling device and working method thereof |
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| CN2344541Y (en) * | 1998-08-20 | 1999-10-20 | 马建民 | Two-tubing hydraulic power oil production equipment |
| CN101240697A (en) * | 2008-03-13 | 2008-08-13 | 上海交通大学 | Minisize down-hole lateral wall annular recess cutting implement |
| CN202000941U (en) * | 2011-04-20 | 2011-10-05 | 中国石油天然气股份有限公司 | Underground sleeving wall punching device for oil well |
| CN103195387A (en) * | 2013-04-16 | 2013-07-10 | 中国石油集团渤海钻探工程有限公司 | Downhole radial casing window opener |
| EP2366056B1 (en) * | 2008-12-12 | 2014-06-11 | Statoil Petroleum AS | Wellbore machining device |
| CN104695886A (en) * | 2015-01-26 | 2015-06-10 | 中国石油集团渤海钻探工程有限公司 | Zero-radius down-hole casing drilling device and drilling method thereof |
| CN105264169A (en) * | 2013-06-14 | 2016-01-20 | 韦尔泰克有限公司 | Downhole machining system and method |
| CN108915590A (en) * | 2018-06-15 | 2018-11-30 | 中国石油集团长城钻探工程有限公司 | The automatically controlled drilling equipment of deep penetration |
-
2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2344541Y (en) * | 1998-08-20 | 1999-10-20 | 马建民 | Two-tubing hydraulic power oil production equipment |
| CN101240697A (en) * | 2008-03-13 | 2008-08-13 | 上海交通大学 | Minisize down-hole lateral wall annular recess cutting implement |
| EP2366056B1 (en) * | 2008-12-12 | 2014-06-11 | Statoil Petroleum AS | Wellbore machining device |
| CN202000941U (en) * | 2011-04-20 | 2011-10-05 | 中国石油天然气股份有限公司 | Underground sleeving wall punching device for oil well |
| CN103195387A (en) * | 2013-04-16 | 2013-07-10 | 中国石油集团渤海钻探工程有限公司 | Downhole radial casing window opener |
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| CN104695886A (en) * | 2015-01-26 | 2015-06-10 | 中国石油集团渤海钻探工程有限公司 | Zero-radius down-hole casing drilling device and drilling method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114922581A (en) * | 2022-05-27 | 2022-08-19 | 重庆科技学院 | Underground casing continuous hole forming device and working method thereof |
| CN114922581B (en) * | 2022-05-27 | 2023-08-18 | 重庆科技学院 | Underground casing pipe continuous perforating device and working method thereof |
| CN115405265A (en) * | 2022-07-06 | 2022-11-29 | 重庆科技学院 | Electrically-driven underground casing continuous hole drilling device and working method thereof |
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| Publication number | Publication date |
|---|---|
| CN110130847B (en) | 2021-08-06 |
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Effective date of registration: 20201020 Address after: No. 6, liupukang, Xicheng District, Beijing 100120 Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: China National Petroleum Corporation Great Wall Drilling Engineering Co.,Ltd. Address before: 124010 Xinglongtai, Liaoning Province, oil street, No. 96, No. Applicant before: China National Petroleum Corporation Great Wall Drilling Engineering Co.,Ltd. |
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