CN211115975U - Casing collar locator relying on friction positioning - Google Patents
Casing collar locator relying on friction positioning Download PDFInfo
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- CN211115975U CN211115975U CN201921358108.2U CN201921358108U CN211115975U CN 211115975 U CN211115975 U CN 211115975U CN 201921358108 U CN201921358108 U CN 201921358108U CN 211115975 U CN211115975 U CN 211115975U
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- 230000009471 action Effects 0.000 claims abstract description 24
- 238000012806 monitoring device Methods 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 36
- 238000010168 coupling process Methods 0.000 abstract description 36
- 238000005859 coupling reaction Methods 0.000 abstract description 36
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of oil gas field development instrument in the pit, concretely relates to rely on sleeve pipe coupling locator of friction location. The utility model discloses a from last to the attach fitting, the control unit that connect gradually extremely down, power pack, electromagnetism component unit and action unit and with the control unit signal connection's the organic setting of ground monitoring devices, realized the seamless airtight sheathed tube location of sleeve pipe coupling, reduced locating part's wearing and tearing speed simultaneously, guaranteed the accuracy of location and effectively prolonged the life-span of instrument.
Description
Technical Field
The utility model belongs to the technical field of oil gas field development instrument in the pit, concretely relates to rely on sleeve pipe coupling locator of friction location.
Background
The coiled tubing dragging fracturing technology has the characteristics of realizing large-scale reconstruction, and achieving layered fracturing, fixed point fracturing and fine fracturing, is widely applied abroad, and also promotes the application of the technology in China, and casing collar positioning is one of the keys for safe and smooth implementation of the technology.
The existing casing coupling locator for the coiled tubing adopts a structure of a spring plate, a positioning fixture block or a whole elastic positioning fixture block, the positioning fixture block is always in an outwards-expanding state under the action of elastic force, if a pipe string is lifted to pass through a casing coupling, the positioning fixture block can be clamped when the pipe coupling passes through a seam, the positioning fixture block can pass through the coupling under the action of the tension of the coiled tubing and the deformation of the spring plate or the whole elastic positioning fixture block, and the hanging weight of the coiled tubing changes at the moment so as to judge the position of the casing coupling.
However, the conventional casing positioning of a casing coupling with a seam can only be met by the conventional mechanical structure casing coupling positioner, the conventional mechanical structure casing coupling positioner cannot be suitable for positioning of a seamless airtight casing of the casing coupling, the maximum outer diameter of the assembled conventional mechanical structure casing coupling positioner is larger than the inner diameter of the casing, in the pulling-off process, a positioning fixture block is always attached to the casing, tools are easily abraded due to long-distance pulling-off operation, and accordingly inaccurate positioning is caused, and normal construction is affected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a rely on sleeve pipe coupling locator of friction location, the purpose is providing one kind and can realize the seamless airtight sheathed tube location of sleeve pipe coupling, reduces locating part's wearing and tearing speed simultaneously, guarantees the accuracy of location and the sleeve pipe coupling locator of instrument life-span.
In order to achieve the above object, the utility model adopts the following technical scheme:
a casing collar locator based on friction location comprises a connecting joint, a control unit, a power unit, an electromagnetic component unit, an action unit and a ground monitoring device; the ground monitoring device is characterized in that the connecting joint, the control unit, the power unit, the electromagnetic component unit and the action unit are sequentially connected from top to bottom, and the ground monitoring device is in electric signal connection with the control unit.
The control unit, the power unit and the electromagnetic component unit are embedded in the connecting joint and are fixedly connected in a sealing mode, and the power unit supplies power to the control unit and the electromagnetic component unit at the same time.
The electromagnetic component unit comprises a coil, a magnet, a reversing valve and a metal shell, wherein the coil and the magnet are connected in the metal shell; a first channel is formed in the axial direction of the metal shell, and the reversing valve is connected to an upper end port of the first channel.
The action unit comprises a connecting sleeve, a transmission sliding sleeve, a fixing sleeve, a pin shaft, a friction plate, an elastic part, a reset pressure spring, a spacer ring, a cone, a pull rod and a pressure cap; the pull rod sequentially penetrates through the transmission sliding sleeve, the fixed sleeve, the reset pressure spring, the spacer ring and the center of the cone from top to bottom, the bottom end of the pull rod is connected with the pressing cap, and the top end of the pull rod is connected with the transmission sliding sleeve; the upper end of the connecting sleeve is fixedly connected with the connecting joint in a sealing manner, the transmission sliding sleeve is sleeved in the connecting sleeve and sealed with the inner side wall of the connecting sleeve, the transmission sliding sleeve is provided with a second channel along the axial direction, the second channel is matched with the electromagnetic component unit, the fixing sleeve is connected with the inner side wall of the bottom end of the connecting sleeve in a sealing manner, and the cone is connected with the pull rod through a shearing pin; the friction plate is rotatably connected with the fixed sleeve through a pin shaft, and a groove is formed in the outer side wall of the friction plate; the elastic piece is connected in a groove on the outer side wall of the friction plate; a cavity is arranged between the transmission sliding sleeve and the fixed sleeve.
The maximum outer diameter surface of the friction plate is knurled and hardened, chamfers are arranged on the upper portion and the lower portion of the outer side surface of the friction plate, and included angles between the chamfers and axial acute angles are smaller than 45 degrees.
The elastic element is a spring or high-elasticity rubber.
And sealing rings are arranged between the connecting sleeve and the transmission sliding sleeve, between the transmission sliding sleeve and the pull rod, and in front of the fixing sleeve and the connecting sleeve.
Has the advantages that:
the utility model discloses a from last to the attach fitting, the control unit that connect gradually extremely down, power pack, electromagnetism component unit and action unit and with the control unit signal connection's the organic setting of ground monitoring devices, realized the seamless airtight sheathed tube location of sleeve pipe coupling, reduced locating part's wearing and tearing speed simultaneously, guaranteed the accuracy of location and effectively prolonged the life-span of instrument.
The above description is only an overview of the technical solution of the present invention, and in order to clearly understand the technical means of the present invention and to implement the technical solution according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-connecting a joint; 2-a control unit; 3-a power unit; 4-an electromagnetic member unit; 5-connecting sleeves; 6, a transmission sliding sleeve; 7-fixing the sleeve; 8-a pin shaft; 9-friction plate; 10-an elastic member; 11-a reset pressure spring; 12-a spacer ring; 13-a cone; 14-set screws; 15-shear pins; 16-a pull rod; 17-pressing the cap; 101-a first channel; 102-second channel.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The first embodiment is as follows:
a casing collar locator according to the friction location shown in figure 1 comprises a coupling head 1, a control unit 2, a power unit 3, an electromagnetic member unit 4, an action unit and a surface monitoring device; the ground monitoring device is characterized in that the connecting joint 1, the control unit 2, the power unit 3, the electromagnetic component unit 4 and the action unit are sequentially connected from top to bottom, and the ground monitoring device is in electric signal connection with the control unit 2.
In actual use, the utility model is connected to the tail end of the coiled tubing string, the coiled tubing string is lifted, the power unit 3 supplies power to the control unit 2, and the control unit 2 monitors the wall thickness change of the continuous casing pipe in the lifting process; when the control unit 2 monitors the position of a coupling, the control unit 2 provides a working signal and sends the working signal to the power unit 3, the power unit 3 supplies power to the electromagnetic component unit 4, the reversing valve of the electromagnetic component unit 4 is opened, and hydraulic pressure at the connecting joint 1 is transmitted into the action unit; under the action of pressure, the action unit is contacted with the inner wall of the sleeve to generate friction force, so that the lifting hanging weight of the coiled tubing string is increased; monitoring corresponding change of the suspended weight and the depth of the tool by a ground monitoring device to accurately judge the position of the coupling; when the control unit monitors that the coupling position is passed, a signal is sent to stop the power supply of the power unit to the electromagnetic component unit, the action unit is reset downwards, and the hanging weight of the pipe column is recovered to be normal.
The utility model discloses a from last to connecting joint, the control unit, power pack, electromagnetism component unit and action unit in proper order down and with the control unit signal connection's the organic setting of ground monitoring devices, realized the seamless airtight sheathed tube location of sleeve pipe coupling, reduce locating part's wearing and tearing speed simultaneously, guaranteed the accuracy of location and effectively prolonged the life-span of instrument.
The utility model discloses a ground monitoring devices and the control unit be prior art. The ground monitoring device is a suspended load and depth monitoring device integrated with the continuous oil pipe vehicle-mounted equipment, has the necessary functions of the continuous oil pipe vehicle, and can monitor the running depth and the suspended load change of the pipe column in real time through the ground monitoring device. The control unit is used for control of the electromagnetic member unit 4.
Example two:
a casing collar locator according to the friction location shown in figure 1 differs from the first embodiment in that: the control unit 2, the power unit 3 and the electromagnetic component unit 4 are embedded in the connecting joint 1 and are fixedly connected in a sealing manner, and the power unit 3 supplies power to the control unit 2 and the electromagnetic component unit 3 at the same time.
When the in-service use, adopt the utility model discloses technical scheme has guaranteed the continuation of whole operation process and the accuracy of acquireing information.
Example three:
a casing collar locator according to the friction location shown in figure 1 differs from the first embodiment in that: the electromagnetic component unit 4 comprises a coil, a magnet, a reversing valve and a metal shell, wherein the coil and the magnet are connected in the metal shell; a first channel 101 is formed along the axial direction of the metal shell, and the reversing valve is connected to an upper end port of the first channel 101.
In actual use, the electromagnetic component unit 4 always generates a magnetic line loop when in a well, the magnetic line loop is changed every time when a coupling passes through, so that induced current is changed, and the control unit 2 acquires a signal and makes a next command according to the signal. When the coupling is used specifically, the electromagnetic signal generated when the coupling passes through the position, namely the change of the induced current, enables detection to be more accurate compared with a mechanical structure.
In this embodiment, the coil and the magnet are bonded and connected in the metal case. The on-off control of the first passage 101 is performed by the control of the directional control valve by the control unit of the related art.
Example four:
a casing collar locator according to the friction location shown in figure 1 differs from the first embodiment in that: the action unit comprises a connecting sleeve 5, a transmission sliding sleeve 6, a fixing sleeve 7, a pin shaft 8, a friction plate 9, an elastic part 10, a reset pressure spring 11, a spacer ring 12, a cone 13, a pull rod 16 and a pressure cap 17; the pull rod 16 sequentially penetrates through the centers of the transmission sliding sleeve 6, the fixed sleeve 7, the reset pressure spring 11, the spacer ring 12 and the cone 13 from top to bottom, the bottom end of the pull rod 16 is connected with the pressure cap 17, and the top end of the pull rod 16 is connected with the transmission sliding sleeve 6; the upper end of the connecting sleeve 5 is fixedly connected with the connecting joint 1 in a sealing manner, the transmission sliding sleeve 6 is sleeved in the connecting sleeve 5 and sealed with the inner side wall of the connecting sleeve 5, the transmission sliding sleeve 6 is provided with a second channel 102 along the axial direction, the second channel 102 is matched with the electromagnetic component unit 4, the fixing sleeve 7 is connected with the inner side wall of the bottom end of the connecting sleeve 5 in a sealing manner, and the cone 13 is connected with the pull rod 16 through a shearing pin 15; the friction plate 9 is rotatably connected with the fixed sleeve 7 through a pin shaft 8, and the outer side wall of the friction plate 9 is provided with a groove; the elastic piece 10 is connected in a groove on the outer side wall of the friction plate 9; a cavity is arranged between the transmission sliding sleeve 6 and the fixed sleeve 7.
When the device is actually used, the pull rod 16 moves upwards to realize friction between the short time and the casing wall, the friction plate 9 is reset under the action of the elastic piece 10 and the reset spring 11, the shearing pin ensures an emergency reset function when the action unit is abnormal, and if the friction plate 9 is not reset smoothly, the shearing pin can be sheared to pull out a pipe column, so that the drill sticking is avoided.
Example five:
according to a casing collar locator based on friction location shown in figure 1, the difference from the fourth embodiment is that: the maximum outer diameter surface of the friction plate 9 is knurled and hardened, chamfers are arranged on the upper side and the lower side of the outer side surface of the friction plate 9, and included angles between the chamfers and axial acute angles are smaller than 45 degrees.
In actual use, the surface treatment of the friction plate 9 ensures the required friction force and slows down the time of friction failure, and the design scheme of the outer surface chamfer can effectively reduce the risk of tool jamming.
Example six:
according to the method for positioning the casing collar locator by friction positioning shown in figure 1, the difference from the fourth embodiment is that: the elastic member 10 is a spring or a high elastic rubber.
In actual use, after the friction plate 9 is outwards opened to complete a friction positioning instruction, the cone descends, the friction plate is inwards recycled by means of the tension of the elastic part, and the function of the friction plate can be better realized by the adoption of the technical scheme.
Example seven:
according to the method for positioning the casing collar locator by friction positioning shown in figure 1, the difference from the fourth embodiment is that: and sealing rings are arranged between the connecting sleeve 5 and the transmission sliding sleeve 6, between the transmission sliding sleeve 6 and the pull rod 16, and in front of the fixing sleeve 7 and the connecting sleeve 5, between the fixing sleeve 7 and the pull rod 16.
When the device is actually used, the driving sliding sleeve drives the pull rod to move upwards to complete the friction positioning action through the confining pressure generated by the arranged sealing ring.
Example eight:
a method for positioning a casing coupling locator by friction positioning comprises the following steps
The method comprises the following steps: connecting the casing coupling locator to the tail end of the coiled tubing string, lifting the coiled tubing string, supplying power to the control unit 2 by the power unit 3, and monitoring the wall thickness change of the continuous casing in the lifting process by the control unit 2;
step two: when the control unit 2 monitors the position of a coupling, the control unit 2 provides a working signal and sends the working signal to the power unit 3, the power unit 3 supplies power to the electromagnetic component unit 4, the reversing valve of the electromagnetic component unit 4 is opened, hydraulic pressure at the connecting joint 1 is transmitted into the first channel 101, and pressure is transmitted into a cavity between the transmission sliding sleeve 6 and the fixed sleeve 7 through the second channel 102;
step three: under the action of pressure, the transmission sliding sleeve 6, the cone 13, the set screw 14, the shearing pin 15, the pull rod 16 and the pressing cap 17 move upwards simultaneously, the reset pressure spring 11 is compressed, the elastic part 10 is expanded, the friction plate 9 rotates axially along the pin shaft 8 and contacts with the inner wall of the sleeve to generate friction force, and the lifting hanging weight of the continuous oil pipe column is increased;
step four: monitoring corresponding change of the suspended weight and the depth of the tool through continuous oil pipe ground monitoring equipment, and judging the position of the coupling;
step five: when the control unit 2 monitors that the coupling position is passed, a signal is sent to stop the power supply of the power unit 3 to the electromagnetic component unit 4, the reversing valve is closed, the pressure transmission first channel 101 is blocked, and the pull rod 16, the transmission sliding sleeve 6 and the pressure cap 17 are reset downwards under the elastic force of the reset pressure spring 11;
step six: the friction plate 9 is reset and recovered under the elastic action of the elastic piece 10, and the hanging weight of the pipe column is recovered to be normal.
In practical use, in the fourth step, the coiled tubing ground monitoring equipment monitors the corresponding change of the suspended weight and the depth of the tool, when a coupling is monitored, the coiled tubing ground monitoring equipment displays the rising of the suspended weight, and the corresponding depth displayed by the equipment is the depth position of the coupling.
By using the method, the seamless airtight sleeve positioning of the sleeve coupling is realized, the abrasion rate of the positioning part is reduced, and the positioning accuracy and the tool life are ensured.
Example nine:
a method for positioning a casing collar locator by friction positioning is different from the eighth embodiment in that: and in the third step, the friction plate 9 rotates along the axial direction of the pin shaft 8 and contacts with the inner wall of the sleeve to generate 0.5-1 ton of friction force.
In actual use, the friction force generated by the axial rotation of the friction plate 9 along the pin shaft 8 and the contact with the inner wall of the sleeve is set to be 0.5-1 ton, so that the safety production can be ensured.
Example ten:
a method for positioning a casing collar locator by friction positioning is different from the eighth embodiment in that: in the sixth step, the friction plate 9 can be recovered after passing through the position of the casing coupling.
In actual use, the friction plate 9 is reset and recovered after passing through the coupling position, the dynamic friction distance between the friction plate 9 and the casing wall is shortened as far as possible, and the service life of the casing coupling positioner positioned by friction is prolonged.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention all fall within the scope of the technical solution of the present invention. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (5)
1. The utility model provides a rely on casing collar locator of friction location which characterized in that: the device comprises a connecting joint (1), a control unit (2), a power unit (3), an electromagnetic component unit (4), an action unit and a ground monitoring device; the ground monitoring device comprises a connecting joint (1), a control unit (2), a power unit (3), an electromagnetic component unit (4) and an action unit, wherein the connecting joint, the control unit (2), the power unit (3), the electromagnetic component unit and the action unit are sequentially connected from top to bottom, and the ground monitoring device is in electric signal connection with the control unit (2); the action unit comprises a connecting sleeve (5), a transmission sliding sleeve (6), a fixing sleeve (7), a pin shaft (8), a friction plate (9), an elastic part (10), a reset pressure spring (11), a spacer ring (12), a cone (13), a pull rod (16) and a pressing cap (17); the pull rod (16) sequentially penetrates through the centers of the transmission sliding sleeve (6), the fixed sleeve (7), the reset pressure spring (11), the spacer ring (12) and the cone (13) from top to bottom, the bottom end of the pull rod (16) is connected with the pressure cap (17), and the top end of the pull rod (16) is connected with the transmission sliding sleeve (6); the upper end of the connecting sleeve (5) is fixedly connected with the connecting joint (1) in a sealing manner, the transmission sliding sleeve (6) is sleeved in the connecting sleeve (5) and sealed with the inner side wall of the connecting sleeve (5), a second channel (102) is formed in the transmission sliding sleeve (6) along the axial direction, the second channel (102) is matched with the electromagnetic component unit (4), the fixing sleeve (7) is connected with the inner side wall of the bottom end of the connecting sleeve (5) in a sealing manner, and the cone (13) is connected with the pull rod (16) through a shearing pin (15); the friction plate (9) is rotatably connected with the fixed sleeve (7) through a pin shaft (8), and a groove is formed in the outer side wall of the friction plate (9); the elastic piece (10) is connected in a groove on the outer side wall of the friction plate (9); a cavity is arranged between the transmission sliding sleeve (6) and the fixed sleeve (7); the elastic member (10) is a spring or high-elasticity rubber.
2. A casing collar locator according to claim 1 wherein: the control unit (2), the power unit (3) and the electromagnetic component unit (4) are embedded in the connecting joint (1) and are fixedly connected in a sealing mode, and the power unit (3) supplies power to the control unit (2) and the electromagnetic component unit (4) at the same time.
3. A casing collar locator according to claim 1 wherein: the electromagnetic component unit (4) comprises a coil, a magnet, a reversing valve and a metal shell, wherein the coil and the magnet are connected in the metal shell; a first channel (101) is formed in the axial direction of the metal shell, and the reversing valve is connected to an upper end port of the first channel (101).
4. A casing collar locator according to claim 1 wherein: the maximum outer diameter surface of the friction plate (9) is knurled and hardened, chamfers are arranged on the upper side and the lower side of the outer side surface of the friction plate (9), and included angles between the chamfers and axial acute angles are smaller than 45 degrees.
5. A casing collar locator according to claim 1 wherein: and sealing rings are arranged between the connecting sleeve (5) and the transmission sliding sleeve (6), between the transmission sliding sleeve (6) and the pull rod (16), and in front of the fixing sleeve (7) and the connecting sleeve (5), between the fixing sleeve (7) and the pull rod (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921358108.2U CN211115975U (en) | 2019-08-21 | 2019-08-21 | Casing collar locator relying on friction positioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921358108.2U CN211115975U (en) | 2019-08-21 | 2019-08-21 | Casing collar locator relying on friction positioning |
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| Publication Number | Publication Date |
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| CN211115975U true CN211115975U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921358108.2U Active CN211115975U (en) | 2019-08-21 | 2019-08-21 | Casing collar locator relying on friction positioning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439541A (en) * | 2019-08-21 | 2019-11-12 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Casing coupling positioner and positioning method based on friction positioning |
-
2019
- 2019-08-21 CN CN201921358108.2U patent/CN211115975U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439541A (en) * | 2019-08-21 | 2019-11-12 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Casing coupling positioner and positioning method based on friction positioning |
| CN110439541B (en) * | 2019-08-21 | 2023-11-03 | 中国石油天然气集团有限公司 | Casing coupling positioner and positioning method by means of friction positioning |
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Patentee before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co. Effective date of registration: 20201105 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: 710018 Shaanxi province Xi'an Weiyang Changqing Changqing prosperous Park District Building Room 1203 Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |