CN106226328A - Laser ring imaging detection instrument and detection method for interior of pipe body - Google Patents
Laser ring imaging detection instrument and detection method for interior of pipe body Download PDFInfo
- Publication number
- CN106226328A CN106226328A CN201610768207.2A CN201610768207A CN106226328A CN 106226328 A CN106226328 A CN 106226328A CN 201610768207 A CN201610768207 A CN 201610768207A CN 106226328 A CN106226328 A CN 106226328A
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- drilling rod
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- corrosion
- detection
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- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000003384 imaging method Methods 0.000 title claims abstract description 10
- 230000007797 corrosion Effects 0.000 claims abstract description 38
- 238000005260 corrosion Methods 0.000 claims abstract description 38
- 230000008054 signal transmission Effects 0.000 claims abstract description 3
- 238000005553 drilling Methods 0.000 claims description 68
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000002950 deficient Effects 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000003252 repetitive effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
- G01N2021/9548—Scanning the interior of a cylinder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a laser ring imaging detection instrument and a detection method thereof inside a pipe body, and the laser ring imaging detection instrument comprises a mechanical part, a data transmission part and a control and operation imaging part, wherein the mechanical part comprises a machine body provided with a servo motor, an umbrella-shaped internal support mechanism, an umbrella-shaped feeding mechanism, an electric slip ring and a laser rotating mechanism, the umbrella-shaped internal support mechanism is fixed on a machine body shell through bolts, the electric slip ring for preventing a signal transmission line from being wound is arranged on the machine body at one end of an output shaft of the servo motor, the top end of the output shaft of the servo motor is fixedly provided with the laser rotating mechanism, the umbrella-shaped feeding mechanism is arranged on the output shaft of the servo motor between the electric slip ring and the laser rotating mechanism, and a laser sensor. The detection method is simple, can efficiently and accurately acquire the corrosion information of the inner wall of the drill rod, and provides technical support for improving the detection precision of the drill rod.
Description
Technical field
The present invention relates to a kind of tubular body laser ring image checking instrument technical field, specifically one is used for examining
Survey oil drill rocker internal corrosion degree, and device and the detection method thereof of oil drill rocker internal corrosion information are provided.
Background technology
Drilling rod is the critical equipment in oil drill string, and it can be to the pressure needed for the broken rock of shaft bottom drill bit transmission, rotating speed, torsion
Square.When wellbore construction, the effect of axial force, centrifugal force, twisting resistance, moment of flexure and dynamic loading is had to be applied concurrently on drilling rod, this
Corrosive medium heavy corrosion drilling rod in outer drilling fluid and drilling fluid.Losing efficacy in any position of drilling rod all to cause serious drilling well
Accident.Dynamic Non-Destruction Measurement is that detection drilling rod has flawless effective ways, therefore various etch pits, the corrosion cracking to drilling rod
Detect, can effectively control drilling rod quality, improve the reliability that drilling rod uses.Current main to the detection of oil drill rocker inwall
Relying on ultrasound examination, this detection method needs couplant, is not easy to the mobile detection of outdoor.
The method of existing laser detection drilling rod inner wall corrosion, laser rotary mechanism is on lorry, passes through four-wheel
Dolly gathers the data of inner wall section in axial direction feeding, rotating in a circumferential direction of laser rotary mechanism, then processes data
Reach a conclusion.This method cannot realize the detection of pipe with small pipe diameter, and the most this device is difficult to make laser rotary mechanism in position, axle center
Put.Therefore, the method is to the high drilling rod of pipe with small pipe diameter, accuracy of detection inapplicable.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of tubular body laser ring image checking instrument
And detection method, thus high efficiency, height automatically realize the detection to drilling rod inner wall corrosion.
For realizing above-mentioned purpose, the present invention adopts the following technical scheme that: a kind of tubular body laser ring image checking
Instrument, including mechanical part, tcp data segment, control and computing imaging moiety, mechanical part includes being provided with servomotor
Body, umbrella support mechanism, umbrella feed mechanism, electric slip ring, laser rotary mechanism, umbrella support structure is bolted
On body fuselage, the electric slip ring preventing signal transmission line to be wound around is arranged on the body of output shaft one end of servomotor,
The top of the output shaft of servomotor is fixed with laser rotary mechanism, and umbrella feed mechanism is arranged on electric slip ring and laser rotary machine
On the output shaft of the servomotor between structure, laser sensor is arranged in laser rotary mechanism；
Tcp data segment includes laser sensor, data collecting card, router, and laser sensor is converted into distance value
Magnitude of voltage, data collecting card gathers the magnitude of voltage of laser sensor, and the data of data collecting card collection are passed through ether by router
Net transfers out；
Controlling to include controller and host computer with computing imaging moiety, controller is connected with servomotor by control line,
Controller, data collecting card, host computer pass through router network consisting, and controlling card is external control module, are used for controlling pipe
Body inner laser ring image checking instrument is in the position within drilling rod；Host computer is used for analyzing and processing drilling rod outline data, obtains
Testing result.
Described umbrella support mechanism is 2, and one is fixed on body fuselage front end, and one is fixed on body fuselage rear end.
Described laser sensor is 2, and 180 ° are arranged symmetrically with vertically.
The detection method of above-mentioned tubular body laser ring image checking instrument, comprises the following steps:
Step one: the parameter that input relevant parameter or employing are cured in inspection software directly controls detection with handle
Instrument；
Step 2: select to adapt to the umbrella support structure of caliber, connect cable, laser ring image checking instrument, host computer,
Laser ring image checking instrument is put in drilling rod to be checked；
Step 3: start detecting instrument and drive servomotor to advance 1.5 2 meters, drive 2 high-precision laser sensor edges
Axial direction moves gently, and servomotor drives 2 high-precision laser sensor rotations simultaneously, and 2 high accuracy swash the most in a flash
The laser beam that optical sensor is launched all will intercept one cross section of drilling rod, obtain the outline data in this cross section, in the drilling rod collection
Wall outline data is delivered to preserve in host computer；
Step 4: host computer carries out data process, i.e. 2 symmetrical laser to the drilling rod inner surface contour data obtained
The value of sensor measurement is added with certain certain value, decrease detection device not in the impact in axle center, draw the diameter of drilling rod inwall,
Then the depth according to drilling rod inner wall corrosion situation color shows the degree of corrosion, and tiling launches an X-Y scheme；
Step 5: obtain the drilling rod inner wall corrosion figure of detection, obtain the maximum of drilling rod inner wall corrosion, by above-mentioned maximum
Value is made comparisons with given drilling rod degree of corrosion limit value, it is judged that whether the extent of corrosion at maximum corrosion meets drilling rod degree of corrosion is sentenced
Disconnected requirement, more than limit value, maximum then shows that drilling rod is defective, otherwise is qualified；
Step 6: for improving the accuracy of detection data, take multiple measurements, completes single detection；
Step 7: by that analogy, repetition step 3, to step 5, obtains repeated detection data and result；
Step 8: record above-mentioned judgement data and result, will determine that the coordinate information at result and maximum corrosion provides
To user；If repetitive measurement result is all qualified, then show that drilling rod is qualified, the most defective.
Step 9: after detection, closes servomotor, two laser sensors, host computers, cuts off the electricity supply, pull down pipe
Industrial control box put into by body inner laser ring image checking instrument.
The tubular body laser ring image checking instrument of the present invention and method have the following advantages compared with prior art: knot
Structure science, automaticity is high, and detection efficiency is high, can be detected by detecting instrument and obtain high-precision drilling rod inner surface contour number
According to.Elastic supporting mechanism is adapted to the change in drilling rod cross section.
Accompanying drawing explanation
Fig. 1 is the structural representation of the tubular body laser ring image checking instrument of the present invention.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings:
As it is shown in figure 1, the tubular body laser ring image checking instrument of the present invention, including mechanical part, data transfer part
Point, control and computing imaging moiety, mechanical part includes being provided with the body 6 of servomotor, umbrella support mechanism 5, umbrella are entered
To mechanism 3, electric slip ring 4, laser rotary mechanism 1, umbrella support structure 5 is bolted on body 6 shell, anti-stop signal
The electric slip ring 4 that transmission line is wound around is arranged on the body 6 of output shaft 7 one end of servomotor, the output shaft 7 of servomotor
Top be fixed with laser rotary mechanism 1, umbrella feed mechanism 3 is arranged on the servo between electric slip ring 4 and laser rotary mechanism 1
On the output shaft 7 of motor, laser sensor 2 is arranged in laser rotary mechanism 1；
Tcp data segment includes laser sensor 2, data collecting card, router, and distance value changed by laser sensor
Become magnitude of voltage, data collecting card gather laser sensor magnitude of voltage, the data that data collecting card is gathered by router pass through with
Too net transfers out；
Controlling to include controller and host computer 8 with computing imaging moiety, controller is connected with servomotor by control line,
Controller, data collecting card, host computer pass through router network consisting, and controlling card is external control module, are used for controlling pipe
Body inner laser ring image checking instrument is in the position within drilling rod；Host computer is used for analyzing and processing drilling rod outline data, obtains
Testing result.
Described umbrella support mechanism 5 is 2, and one is fixed on body 6 case nose, after one is fixed on body 6 shell
End.
Described laser sensor 2 is 2, and 180 ° are arranged symmetrically with vertically.
As it is shown in figure 1, the detection method of above-mentioned tubular body laser ring image checking instrument, comprise the following steps:
Step one: input relevant parameter parameters such as () drilling rod specification, Scanning speeds in inspection software or use solidification
Good parameter directly controls scanning equipment with handle；
Step 2: select to adapt to the umbrella support structure of caliber, connect cable, laser ring image checking instrument, host computer,
Laser ring image checking instrument is put in drilling rod to be checked；
Step 3: start scanning equipment and drive servomotor to advance 1.5 2 meters of (servomotor and umbrellas in scanning equipment
The pace of feed mechanism is associated), drive 2 high-precision laser sensors to move the most gently, servo simultaneously
2 high-precision laser sensor rotations of driven by motor, the laser beam of 2 high-precision laser sensor emission all will cut the most in a flash
Take one cross section of drilling rod, obtain the outline data in this cross section, the drilling rod inner surface contour data gathered are delivered to preserve in host computer；
Step 4: host computer carries out data process, i.e. 2 symmetrical laser to the drilling rod inner surface contour data obtained
The value of sensor measurement is added with certain certain value, decrease detection device not in the impact in axle center, draw the diameter of drilling rod inwall,
Then the depth according to drilling rod inner wall corrosion situation color shows the degree (distance changes into color) of corrosion, expansion one of tiling
Individual X-Y scheme；
Step 5: obtain the drilling rod inner wall corrosion figure of detection, obtain the maximum of drilling rod inner wall corrosion, by above-mentioned maximum
Value is made comparisons with given drilling rod degree of corrosion limit value, it is judged that whether the extent of corrosion at maximum corrosion meets drilling rod degree of corrosion is sentenced
Disconnected requirement, more than limit value, maximum then shows that drilling rod is defective, otherwise is qualified；
Step 6: for improving the accuracy of detection data, take multiple measurements, completes single detection；
Step 7: by that analogy, repetition step 3, to step 5, obtains repeated detection data and result；
Step 8: record above-mentioned judgement data and result, will determine that the coordinate information at result and maximum corrosion provides
To user；If repetitive measurement result is all qualified, then show that drilling rod is qualified, the most defective.
Step 9: after detection, closes servomotor, two laser sensors, host computers, cuts off the electricity supply, pull down pipe
Industrial control box put into by body inner laser ring image checking instrument.
The elastic umbrella support mechanism being made up of support wheel, wheel shaft, support wheel support, support base, torsion spring in the present invention,
Can adapt to the change of drilling rod internal diameter；Use the support of swept-back simultaneously, solve the impact on feeding of the drilling rod inwall boss, if
Support mechanism is vertical with drilling rod inwall, and support wheel is in order to adapt to caliber, and diameter is smaller, and being fed into boss can be stuck.By entering
Give the umbrella feed mechanism of wheel, wheel shaft, adaptor, screwdriven support, spiral base composition, feed wheel and axial direction Cheng Gu
Fixed helical angle, helical angle has corresponding relation with the speed of feeding, in order to ensure three groups of feed arrangements and axial angle phase
With, (it is prior art about umbrella support mechanism and umbrella feed mechanism at adaptor subscript scale, may refer to " oil
Machinery " " Parameter analysis of umbrella radial expansion mechanism and the characteristic research " of the 1st phase of volume 43 in 2015)；The rotation of output shaft,
The power of the feeding of whole device is provided.This detection method is symmetrically placed, in rotary course with 2 laser sensors 180 °
Gathering drilling rod inwall three-dimensional coordinate information, servomotor turns half-turn just can detect the whole circle of drilling rod；Processed by host computer and count
Calculate the expanded view of drilling rod inwall 360 °, represent the degree of corrosion with Colorbr, compared with drilling rod inner wall corrosion limit value, sentence
Breaking of rod bar inner wall corrosion situation, will determine that result is supplied to user.This apparatus structure science, detection method is simple, can be efficiently accurate
Really obtain drilling rod inner wall corrosion information, provide technical support for improving the accuracy of detection of drilling rod.
In sum, present disclosure is not limited in the above embodiments, and the knowledgeable people in same area can
Can propose other embodiment within technological guidance's thought of the present invention easily, but this embodiment is included in this
Within the scope of bright.
Claims (4)
1. a tubular body laser ring image checking instrument, including mechanical part, tcp data segment, control and computing imaging
Part, it is characterised in that mechanical part includes being provided with the body (6) of servomotor, umbrella support mechanism (5), umbrella feeding
Mechanism (3), electric slip ring (4), laser rotary mechanism (1), umbrella support structure (5) is bolted on body (6) shell,
On the body (6) of output shaft (7) one end that the electric slip ring (4) preventing signal transmission line to be wound around is arranged on servomotor, servo
The top of the output shaft (7) of motor is fixed with laser rotary mechanism (1), and umbrella feed mechanism (3) is arranged on electric slip ring (4) and swashs
On the output shaft (7) of the servomotor between light rotating mechanism (1), laser sensor (2) is arranged on laser rotary mechanism (1)
On；
Tcp data segment includes laser sensor (2), data collecting card, router, and laser sensor is converted into distance value
Magnitude of voltage, data collecting card gathers the magnitude of voltage of laser sensor, and the data of data collecting card collection are passed through ether by router
Net transfers out；
Controlling to include controller and host computer (8) with computing imaging moiety, controller is connected with servomotor by control line, control
Device processed, data collecting card, host computer pass through router network consisting, and controlling card is external control module, is used for controlling body
Inner laser ring image checking instrument is in the position within drilling rod；Host computer is used for analyzing and processing drilling rod outline data, is examined
Survey result.
Tubular body laser ring image checking instrument the most according to claim 1, it is characterised in that described umbrella support machine
Structure (5) is 2, and one is fixed on body (6) case nose, and one is fixed on body (6) outer casing back.
Tubular body laser ring image checking instrument the most according to claim 1, it is characterised in that described laser sensor
(2) being 2,180 ° are arranged symmetrically with vertically.
4. the detection method of the tubular body laser ring image checking instrument as described in any one of claim 1-3, its feature exists
In, comprise the following steps:
Step one: the parameter that input relevant parameter or employing are cured in inspection software directly controls detector with handle
Device；
Step 2: select to adapt to the umbrella support structure of caliber, connect cable, laser ring image checking instrument, host computer, will swash
Ring of light image checking instrument is put in drilling rod to be checked；
Step 3: start detecting instrument and drive servomotor to advance 1.5 2 meters, drive 2 high-precision laser sensors vertically
Direction is moved gently, and servomotor drives 2 high-precision laser sensor rotations simultaneously, and 2 high-precision lasers pass the most in a flash
The laser beam that sensor is launched all will intercept one cross section of drilling rod, obtain the outline data in this cross section, the drilling rod inwall gathered is taken turns
Wide data are delivered to preserve in host computer；
Step 4: host computer carries out data process, i.e. 2 symmetrical laser sensings to the drilling rod inner surface contour data obtained
Device measure value be added with certain certain value, decrease detect device not in the impact in axle center, draw the diameter of drilling rod inwall, then
The degree of the depth display corrosion according to drilling rod inner wall corrosion situation color, tiling launches an X-Y scheme；
Step 5: obtain detection drilling rod inner wall corrosion figure, obtain the maximum of drilling rod inner wall corrosion, by above-mentioned maximum with
Given drilling rod degree of corrosion limit value is made comparisons, it is judged that whether the extent of corrosion at maximum corrosion meets drilling rod degree of corrosion judges to want
Asking, more than limit value, maximum then shows that drilling rod is defective, otherwise be qualified；
Step 6: for improving the accuracy of detection data, take multiple measurements, completes single detection；
Step 7: by that analogy, repetition step 3, to step 5, obtains repeated detection data and result；
Step 8: record above-mentioned judgement data and result, will determine that the coordinate information at result and maximum corrosion is supplied to use
Family；If repetitive measurement result is all qualified, then show that drilling rod is qualified, the most defective.
Step 9: after detection, closes servomotor, two laser sensors, host computers, cuts off the electricity supply, pull down in body
Industrial control box put into by portion's laser ring image checking instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768207.2A CN106226328B (en) | 2016-08-30 | 2016-08-30 | Laser ring imaging detection instrument and detection method for interior of pipe body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768207.2A CN106226328B (en) | 2016-08-30 | 2016-08-30 | Laser ring imaging detection instrument and detection method for interior of pipe body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106226328A true CN106226328A (en) | 2016-12-14 |
| CN106226328B CN106226328B (en) | 2022-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610768207.2A Active CN106226328B (en) | 2016-08-30 | 2016-08-30 | Laser ring imaging detection instrument and detection method for interior of pipe body |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02201145A (en) * | 1989-01-30 | 1990-08-09 | Power Reactor & Nuclear Fuel Dev Corp | Device and method for flaw-detecting inner wall of piping appliance |
| CN201149481Y (en) * | 2007-09-25 | 2008-11-12 | 宝山钢铁股份有限公司 | Device for automatically measuring jackrod inner thickened segment |
| CN102095384A (en) * | 2010-11-25 | 2011-06-15 | 天津大学 | Multiparameter internal-diameter measurement system and method based on high-precision coaxial positioning |
| CN104565675A (en) * | 2014-06-20 | 2015-04-29 | 北京石油化工学院 | Pipeline detection robot |
| CN204882404U (en) * | 2015-09-09 | 2015-12-16 | 广东工业大学 | Pipeline defect detecting robot based on scanning of annular laser three -dimensional |
| CN206020291U (en) * | 2016-08-30 | 2017-03-15 | 中国石油集团渤海钻探工程有限公司 | Laser ring imaging detection instrument inside pipe body |
-
2016
- 2016-08-30 CN CN201610768207.2A patent/CN106226328B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02201145A (en) * | 1989-01-30 | 1990-08-09 | Power Reactor & Nuclear Fuel Dev Corp | Device and method for flaw-detecting inner wall of piping appliance |
| CN201149481Y (en) * | 2007-09-25 | 2008-11-12 | 宝山钢铁股份有限公司 | Device for automatically measuring jackrod inner thickened segment |
| CN102095384A (en) * | 2010-11-25 | 2011-06-15 | 天津大学 | Multiparameter internal-diameter measurement system and method based on high-precision coaxial positioning |
| CN104565675A (en) * | 2014-06-20 | 2015-04-29 | 北京石油化工学院 | Pipeline detection robot |
| CN204882404U (en) * | 2015-09-09 | 2015-12-16 | 广东工业大学 | Pipeline defect detecting robot based on scanning of annular laser three -dimensional |
| CN206020291U (en) * | 2016-08-30 | 2017-03-15 | 中国石油集团渤海钻探工程有限公司 | Laser ring imaging detection instrument inside pipe body |
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| CN106226328B (en) | 2022-09-09 |
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Effective date of registration: 20220810 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC Bohai Drilling Engineering Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone Huanghai Road 106, Bohai Drilling Engineering Co., Ltd. science and Technology Development Office Applicant before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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