CN110924889A - Wellhead casing head device - Google Patents
Wellhead casing head device Download PDFInfo
- Publication number
- CN110924889A CN110924889A CN201911339946.XA CN201911339946A CN110924889A CN 110924889 A CN110924889 A CN 110924889A CN 201911339946 A CN201911339946 A CN 201911339946A CN 110924889 A CN110924889 A CN 110924889A
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- China
- Prior art keywords
- hole
- transition
- optical fiber
- casing head
- hanger
- 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.)
- Pending
Links
- 230000007704 transition Effects 0.000 claims abstract description 82
- 239000013307 optical fiber Substances 0.000 claims abstract description 78
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 239000003208 petroleum Substances 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims description 47
- 238000007906 compression Methods 0.000 claims description 27
- 230000006835 compression Effects 0.000 claims description 26
- 238000003825 pressing Methods 0.000 claims description 17
- 238000012856 packing Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 9
- 241000191291 Abies alba Species 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
-
- 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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
- E21B33/0407—Casing heads; Suspending casings or tubings in well heads with a suspended electrical cable
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)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention discloses a wellhead casing head device, which relates to the technical field of petroleum well facilities and comprises a transition flange connected with a Christmas tree, wherein the transition flange is connected with a casing head, the central lines of inner holes of the transition flange and the casing head are superposed, the upper part of a central hole of the casing head is matched with a hanger, two ends of the central hole of the hanger are in threaded connection with a petroleum casing pipe, a through hole communicated with the central hole is formed in the side wall of the transition flange, and a first sealing component is arranged at an orifice at the outer side of the; the hanger lateral wall is equipped with the transition hole that supplies optic fibre to pass through, and in the central hole of transition hole upper end orientation transition flange, the lower extreme faced the central hole of casing head, the transition hole drill way was equipped with seal assembly two. The optical fiber is fed from the through hole of the transition flange, surrounds the petroleum casing pipe and then extends out of the transition hole of the hanger; meanwhile, the optical fiber and the via hole are sealed by the first sealing assembly, the optical fiber and the transition hole are sealed by the second sealing assembly, the hanger and the optical fiber are not interfered with each other, the optical fiber is prevented from being bent, and the service life of the optical fiber is prolonged.
Description
Technical Field
The invention relates to the technical field of oil well facilities, in particular to a wellhead casing head device.
Background
The casing head product is a well mouth guarantee condition which must be provided in oil and gas well drilling and production operation, mainly meets the requirement that a well mouth blowout preventer group must be installed in a matched manner for preventing 'blowout' in the drilling operation, provides effective well mouth connection for the production and transportation operation, and provides a safe, efficient and convenient ground and underground effective communication mode for multiple engineering operations. In order to observe the underground condition of petroleum after well completion at any time, the hanger for the petroleum casing head needs to realize underground video acquisition through optical fibers, and the optical fibers cannot influence the performance of the hanger. However, the optical fiber arrangement in the prior art has technical defects, the optical fiber arrangement cannot be interfered with the hanger, and potential safety hazards of damaging the optical fiber exist in the working process of subsequent tools and equipment.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wellhead casing head device aiming at the defects of the prior art, which can effectively improve the operation reliability of optical fibers and ensure the stable performance of an oil casing head hanger.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a wellhead casing head device comprises a transition flange connected with a Christmas tree, wherein the transition flange is connected with a casing head through bolts, the transition flange is superposed with the central line of an inner hole of the casing head, the upper part of a central hole of the casing head is matched with a hanger, two ends of the central hole of the hanger are in threaded connection with petroleum casings, and the petroleum casings at two ends extend into the central holes of the casing head and the transition flange; a through hole for the optical fiber to pass through is formed in the side wall of the transition flange, the through hole is communicated with a central hole of the transition flange, and a first sealing assembly for sealing the optical fiber is arranged at an orifice at the outer side of the through hole; the side wall of the hanger is provided with a transition hole for the optical fiber to pass through, the upper end of the transition hole faces the inside of the central hole of the transition flange, the lower end of the transition hole faces the inside of the central hole of the casing head, and the orifice of the transition hole is provided with a second sealing component for sealing the optical fiber; the optical fiber surrounds the outside of the petroleum casing pipe of the orifice at the upper end of the hanger, one end of the optical fiber penetrates through the through hole in the side wall of the transition flange and extends to the outside of the transition flange, and the other end of the optical fiber penetrates through the transition hole in the side wall of the hanger and extends downwards along the center hole of the casing head.
Preferably, the transition hole is parallel to a central hole of the hanger, and the second sealing assembly is arranged at an upper end orifice of the transition hole.
Preferably, the first sealing assembly comprises a pressing cap, two first metal gaskets and a plurality of first rubber sealing rings, the two first metal gaskets and the plurality of first rubber sealing rings have the same outer diameter, the middle parts of the two first metal gaskets and the plurality of first rubber sealing rings are respectively provided with a through hole tightly matched with the optical fiber, and the middle part of the pressing cap is provided with a through hole in clearance fit with the optical fiber; the hole orifice of the through hole is provided with a threaded hole matched with the pressing cap and a blind hole matched with the first metal washer, and the diameters of the threaded hole and the blind hole are larger than the diameter of the through hole; a plurality of first rubber seal ring sets up in parallel between two first metal packing rings.
Preferably, the diameter of the threaded hole of the through hole orifice is larger than the diameter of a blind hole matched with the first metal gasket, and the diameter of the through hole in the middle of the pressing cap is smaller than the outer diameter of the first metal gasket.
Preferably, the sealing assembly II comprises a compression screw, two second metal gaskets and a plurality of second rubber sealing rings, the two second metal gaskets and the plurality of second rubber sealing rings have the same outer diameter, the middle parts of the two second metal gaskets and the plurality of second rubber sealing rings are respectively provided with a through hole tightly matched with the optical fiber, and the middle part of the compression screw is provided with a through hole in clearance fit with the optical fiber; the upper end orifice of the transition hole is provided with a threaded hole matched with the compression screw and a blind hole matched with the second metal washer, and the diameters of the threaded hole and the blind hole are larger than the diameter of the transition hole; and the plurality of second rubber sealing rings are arranged between the two second metal gaskets in parallel.
Preferably, the top of the compression screw is provided with a counter bore for applying torque to the compression screw, and the minor diameter of the threaded hole of the transitional hole orifice is larger than the major diameter of the blind hole of the second metal gasket.
Preferably, the optical fiber connector further comprises a locking piece matched with the compression screw, and the middle part of the locking piece is provided with an unthreaded hole matched with the optical fiber along the length direction of the locking piece; and two ends of the locking piece are respectively matched with the compression screw and the wrench and used for applying torque to the compression screw.
Preferably, still include with housing screw complex retaining member, retaining member and housing screw complex one end are a style of calligraphy application of force portion, housing screw's top is a style of calligraphy counter bore of complex with it, the other end of retaining member be with spanner complex four square portions.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the invention has the advantages that through the through holes and the transition holes are formed on the side walls of the transition flange and the hanger, the optical fiber is fed into the transition flange from the through hole of the transition flange and extends out of the transition hole of the hanger after surrounding the petroleum casing pipe, and the optical fiber is prevented from being bent; meanwhile, the optical fiber and the via hole are sealed by the first sealing assembly, and the optical fiber and the transition hole are sealed by the second sealing assembly. The invention realizes the mutual noninterference of the hanger and the optical fiber, ensures the safe operation of the optical fiber and prolongs the service life of the optical fiber.
Drawings
FIG. 1 is a schematic block diagram of a wellhead casing head assembly according to an embodiment of the present invention;
FIG. 2 is a sectional view A-A of FIG. 1;
FIG. 3 is an enlarged view of a portion of the first seal assembly of FIG. 1;
FIG. 4 is an enlarged view of a portion of the second seal assembly of FIG. 1;
FIG. 5 is a schematic view of the structure of the retaining member in one embodiment of the present invention;
in the figure: 1-transition flange, 2-casing head, 3-hanger, 4-petroleum casing, 5-optical fiber, 6-via hole, 7-sealing component I, 8-transition hole, 9-sealing component II, 10-locking component, 11-unthreaded hole and 12-sealing backing ring; 100-force application part, 101-square part; 71-a press cap, 72-a first metal gasket, 73-a first rubber seal ring; 91-compression screw, 92-second metal gasket, 93-second rubber sealing ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, the wellhead casing head device provided by the invention comprises a transition flange 1 connected with a christmas tree, wherein the transition flange 1 is connected with a casing head 2 through a bolt, the center line of an inner hole of the casing head 2 coincides with that of the transition flange 1, the upper part of a central hole of the casing head 2 is matched with a hanger 3, and meanwhile, the upper end face of the hanger 3 is in sealing fit with the lower end face of the transition flange 1 through a sealing gasket ring 12; two ends of a central hole of the hanger 3 are in threaded connection with petroleum sleeves 4, and the petroleum sleeves 4 at the two ends extend into the central holes of the sleeve head 2 and the transition flange 1; a through hole 6 for an optical fiber 5 to pass through is formed in the side wall of the transition flange 1, the through hole 6 is communicated with a central hole of the transition flange 1, and a first sealing assembly 7 for sealing the optical fiber 5 is arranged at an orifice at the outer side of the through hole 6; a transition hole 8 for the optical fiber 5 to pass through is formed in the side wall of the hanger 3, the upper end of the transition hole 8 faces into the central hole of the transition flange 1, the lower end of the transition hole faces into the central hole of the casing head 2, and a sealing assembly II 9 for sealing the optical fiber 5 is arranged at the orifice of the transition hole 1; and the optical fiber 5 is surrounded on the outer wall of the petroleum casing 4 of the orifice at the upper end of the hanger 3, one end of the optical fiber 5 penetrates through the through hole 6 of the side wall of the transition flange 1 and extends to the outside of the transition flange 1, and the other end of the optical fiber 5 penetrates through the transition hole 8 of the side wall of the hanger 3 and extends downwards along the central hole of the casing head 2. The optical fiber is fed from the through hole of the transition flange, surrounds the petroleum casing pipe and then extends out of the transition hole of the hanger; meanwhile, the optical fiber and the via hole are sealed by the first sealing component, the optical fiber and the transition hole are sealed by the second sealing component, mutual interference between the hanger and the optical fiber is realized, bending of the optical fiber is avoided, interference of follow-up tools and equipment to the optical fiber in the working process is avoided, and the phenomenon of damaging the optical fiber is avoided.
In a preferred embodiment of the present invention, as shown in fig. 1, the transition hole 8 is parallel to the central hole of the hanger 3, and the second sealing assembly 9 is disposed at the upper end opening of the transition hole 8. The structure is convenient to process and manufacture, and meanwhile, the installation and sealing operation of the optical fiber are facilitated.
In one embodiment of the present invention, as shown in fig. 2 and 3, the first sealing assembly 7 includes a pressing cap 71, two first metal gaskets 72 and a plurality of first rubber sealing rings 73, the two first metal gaskets 72 and the plurality of first rubber sealing rings 73 have the same outer diameter, and a through hole tightly fitting with the optical fiber 5 is provided in the middle of each of the two first metal gaskets 72 and the plurality of first rubber sealing rings 73, and a through hole clearance-fitting with the optical fiber 5 is provided in the middle of the pressing cap 71; the hole opening of the through hole 6 is provided with a threaded hole matched with the pressing cap 71 and a blind hole matched with the first metal washer 72, and the diameters of the threaded hole and the blind hole are larger than the diameter of the through hole 6; a plurality of first rubber sealing rings 73 are arranged in parallel between the two first metal gaskets 72. Wherein, the excircle and the via hole tight fit of first rubber seal circle utilize the first rubber seal circle suit of a plurality of on optic fibre, realize optic fibre in the sealed of via hole, protect the first rubber seal circle of a plurality of with the help of two first metal packing rings, avoid optic fibre to take place to shift at the first rubber seal circle of operation in-process, utilize at last to press the cap to compress tightly first metal packing ring and first rubber seal circle fixedly to realize optic fibre at the sealed fixed of via hole.
Further optimizing the technical scheme, as shown in fig. 3, the diameter of the threaded hole of the aperture of the through hole 6 is larger than the diameter of the blind hole matched with the first metal washer 72, and the diameter of the through hole in the middle of the pressing cap 71 is smaller than the outer diameter of the first metal washer 72. The structure can ensure that the pressing cap presses the first metal gasket tightly; meanwhile, the through hole in the middle of the pressing cap is larger than the outer diameter of the optical fiber, so that the optical fiber can freely penetrate through the pressing cap conveniently.
In an embodiment of the present invention, as shown in fig. 4, the second sealing assembly 9 includes a compression screw 91, two second metal gaskets 92 and a plurality of second rubber sealing rings 93, the two second metal gaskets 92 and the plurality of second rubber sealing rings 93 have the same outer diameter, and a through hole tightly fitted with the optical fiber 5 is formed in the middle of each of the two second metal gaskets 92 and the plurality of second rubber sealing rings 93, and a through hole loosely fitted with the optical fiber 5 is formed in the middle of the compression screw 91; a threaded hole matched with the compression screw 91 and a blind hole matched with the second metal washer 92 are formed in an upper end orifice of the transition hole 8, and the diameters of the threaded hole and the blind hole are larger than that of the transition hole 8; a plurality of second rubber sealing rings 93 are arranged in parallel between the two second metal gaskets 92. Wherein, the excircle and the transition hole tight fit of second rubber seal, utilize a plurality of second rubber seal suit on optic fibre, realize the sealing effect to optic fibre, play the guard action to a plurality of second rubber seal with the help of two second metal packing rings, avoid optic fibre second rubber seal to take place to shift in operation process, utilize housing screw to compress tightly second metal packing ring and second rubber seal at last and fix to realize optic fibre at the downthehole sealed fixed of transition.
In a preferred embodiment of the present invention, as shown in fig. 4, the top of the compression screw 91 is provided with a counter bore 910 for applying torque to the compression screw 91, and the small diameter of the threaded hole of the aperture of the transition hole 8 is larger than the large diameter of the blind hole of the second metal washer 92.
In a preferred embodiment of the present invention, the optical fiber connector further comprises a locking member 10 matched with the compression screw 91, wherein the middle part of the locking member 10 is provided with an optical hole 11 matched with the optical fiber 5 along the length direction; the two ends of the locking member 10 are respectively matched with the pressing screw 91 and the wrench, and are used for applying torque to the pressing screw 91. One end of the locking piece 10, which is matched with the compression screw 91, is a linear force application part 100, the top of the compression screw 91 is a linear counter bore matched with the compression screw, and the other end of the locking piece 10 is a square part 101 matched with a wrench. The spanner is matched with the four sides of the locking part to apply torque, and the torque is transmitted to the compression screw through the linear force application part of the locking part, so that the second metal washer is locked and fixed.
Through tests, the device for arranging the second transition hole on the upper end of the hanger and the device for arranging the first transition flange with the through hole and the first seal assembly can bear 35MPa of pressure, and the purposes that the optical fiber penetrates through the hanger to perform well logging and the performance of the hanger is not influenced are achieved.
In the application process, the through hole is formed in the side wall of the transition flange to provide an outlet for the optical fiber, the optical fiber is sealed and bears the Christmas tree, and the optical fiber is wound on the outer wall of the petroleum casing pipe to realize smooth transition through the petroleum casing pipe screwed with the hanger in a threaded mode, so that the optical fiber is prevented from being bent and bent. The optical fiber passes through the outer wall of the petroleum casing pipe, and the inner hole of the petroleum casing pipe is subjected to other operations through the hanger, so that the optical fiber cannot be damaged. The invention does not influence the use performance of the hanger, and subsequent tools and equipment do not interfere the optical fiber, thereby avoiding the phenomenon of damaging the optical fiber.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A wellhead casing head device is characterized in that: the transition flange is connected with a casing head through a bolt, the transition flange is superposed with the central line of an inner hole of the casing head, the upper part of a central hole of the casing head is matched with a hanger, two ends of the central hole of the hanger are in threaded connection with petroleum casings, and the petroleum casings at the two ends extend into the central holes of the casing head and the transition flange; a through hole for the optical fiber to pass through is formed in the side wall of the transition flange, the through hole is communicated with a central hole of the transition flange, and a first sealing assembly for sealing the optical fiber is arranged at an orifice at the outer side of the through hole; the side wall of the hanger is provided with a transition hole for the optical fiber to pass through, the upper end of the transition hole faces the inside of the central hole of the transition flange, the lower end of the transition hole faces the inside of the central hole of the casing head, and the orifice of the transition hole is provided with a second sealing component for sealing the optical fiber; the optical fiber surrounds the outside of the petroleum casing pipe of the orifice at the upper end of the hanger, one end of the optical fiber penetrates through the through hole in the side wall of the transition flange and extends to the outside of the transition flange, and the other end of the optical fiber penetrates through the transition hole in the side wall of the hanger and extends downwards along the center hole of the casing head.
2. The wellhead casing head device according to claim 1, wherein: the transition hole is parallel to the central hole of the hanger, and the second sealing assembly is arranged at the upper end orifice of the transition hole.
3. The wellhead casing head device according to claim 1, wherein: the sealing assembly I comprises a pressing cap, two first metal gaskets and a plurality of first rubber sealing rings, the two first metal gaskets and the plurality of first rubber sealing rings have the same outer diameter, the middle parts of the two first metal gaskets and the plurality of first rubber sealing rings are respectively provided with a through hole tightly matched with the optical fiber, and the middle part of the pressing cap is provided with a through hole in clearance fit with the optical fiber; the hole orifice of the through hole is provided with a threaded hole matched with the pressing cap and a blind hole matched with the first metal washer, and the diameters of the threaded hole and the blind hole are larger than the diameter of the through hole; a plurality of first rubber seal ring sets up in parallel between two first metal packing rings.
4. A wellhead casing head assembly according to claim 3, wherein: the diameter of the threaded hole of the through hole orifice is larger than the diameter of a blind hole matched with the first metal gasket, and the diameter of the through hole in the middle of the pressing cap is smaller than the outer diameter of the first metal gasket.
5. A wellhead casing head assembly according to any of claims 1 to 4, characterised in that: the second sealing assembly comprises a compression screw, two second metal gaskets and a plurality of second rubber sealing rings, the two second metal gaskets and the plurality of second rubber sealing rings have the same outer diameter, the middle parts of the two second metal gaskets and the plurality of second rubber sealing rings are respectively provided with a through hole tightly matched with the optical fiber, and the middle part of the compression screw is provided with a through hole in clearance fit with the optical fiber; the upper end orifice of the transition hole is provided with a threaded hole matched with the compression screw and a blind hole matched with the second metal washer, and the diameters of the threaded hole and the blind hole are larger than the diameter of the transition hole; and the plurality of second rubber sealing rings are arranged between the two second metal gaskets in parallel.
6. The wellhead casing head device according to claim 5, wherein: the top of the compression screw is provided with a counter bore used for applying torque to the compression screw, and the small diameter of the threaded hole of the orifice of the transition hole is larger than the large diameter of the blind hole of the second metal gasket.
7. The wellhead casing head device according to claim 5, wherein: the optical fiber connector also comprises a locking piece matched with the compression screw, and the middle part of the locking piece is provided with an optical hole matched with the optical fiber along the length direction of the locking piece; and two ends of the locking piece are respectively matched with the compression screw and the wrench and used for applying torque to the compression screw.
8. The wellhead casing head device according to claim 6, wherein: still include with housing screw complex retaining member, retaining member and housing screw complex one end are a style of calligraphy application of force portion, housing screw's top is a style of calligraphy counter bore of complex with it, the other end of retaining member be with spanner complex square portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339946.XA CN110924889A (en) | 2019-12-23 | 2019-12-23 | Wellhead casing head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339946.XA CN110924889A (en) | 2019-12-23 | 2019-12-23 | Wellhead casing head device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110924889A true CN110924889A (en) | 2020-03-27 |
Family
ID=69860715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911339946.XA Pending CN110924889A (en) | 2019-12-23 | 2019-12-23 | Wellhead casing head device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110924889A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113006731A (en) * | 2021-04-23 | 2021-06-22 | 京鸿石油钻采工程技术有限公司 | Self-locking casing head |
| CN115680544A (en) * | 2021-07-21 | 2023-02-03 | 中国石油天然气集团有限公司 | Multichannel optical fiber passes through test casing head |
-
2019
- 2019-12-23 CN CN201911339946.XA patent/CN110924889A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113006731A (en) * | 2021-04-23 | 2021-06-22 | 京鸿石油钻采工程技术有限公司 | Self-locking casing head |
| CN113006731B (en) * | 2021-04-23 | 2022-08-12 | 京鸿石油钻采工程技术有限公司 | Self-locking casing head |
| CN115680544A (en) * | 2021-07-21 | 2023-02-03 | 中国石油天然气集团有限公司 | Multichannel optical fiber passes through test casing head |
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