CN205638328U - Well head suspension assembly - Google Patents
Well head suspension assembly Download PDFInfo
- Publication number
- CN205638328U CN205638328U CN201620331246.1U CN201620331246U CN205638328U CN 205638328 U CN205638328 U CN 205638328U CN 201620331246 U CN201620331246 U CN 201620331246U CN 205638328 U CN205638328 U CN 205638328U
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- Prior art keywords
- hole
- pressure cap
- jackscrew
- diameter
- well head
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- 239000000725 suspension Substances 0.000 title claims description 34
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 125000006850 spacer group Chemical group 0.000 claims description 18
- 238000012856 packing Methods 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 2
- 229910002804 graphite Inorganic materials 0.000 abstract 2
- 239000010439 graphite Substances 0.000 abstract 2
- 238000011900 installation process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 210000002421 cell wall Anatomy 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002595 cold damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model relates to a well head hangs assembly, include connector, oil pipe link spare, press the cap and prevent scurrying the jackscrew. The center of the connecting body is provided with an axial step through hole; an annular step is formed in the axial stepped through hole; the oil pipe hanging piece is tubular and coaxially penetrates through the axial stepped through hole; a graphite sealing ring and a spacing ring for sealing are arranged between the sealing section and the inner wall of the large-diameter hole; the pressure cap is sleeved at the upper end of the oil pipe hanging piece in a threaded manner to cover the top of the annular space. The pressure cap and the oil pipe hanging piece are hung on the annular step through a spacing ring and a graphite sealing ring; the end part of the anti-channeling jackscrew extends into the large-diameter hole and is abutted and matched with the annular stopping part. The utility model discloses compact structure, safe and reliable, with low costs, simple to use. Particularly, under the condition that the well mouth of the original steam huff-puff well is not damaged, the split connection of the pipe column and the reducing flange is realized, the requirements of the installation process of snubbing operation are met, the original well mouth is not scrapped, and resources are saved.
Description
Technical field
This utility model is the device about a kind of snubbing serving, particularly relates to a kind of well head suspension assembly for snubbing serving.
Background technology
Along with the development of snubbing serving technology, steam-stimulated well also proposes demand to snubbing serving technology.Steam-stimulated well take snubbing serving can protect down-hole Wen Chang, prevent cold damage, formation protection, prevent pollute, improve recovery ratio.But at present the well head of steam-stimulated well is tubing string and adapter flange integral type screwed connection, it is impossible to remove well head under no killing well state, install no killing well equipment, that is this kind of well head cannot meet the mounting process needs of snubbing serving.In order to meet the needs of snubbing serving, if the well head of existing steam-stimulated well is carried out bigger transformation, then existing well head resource can be wasted.
Thus, the present inventor relies on experience and the practice being engaged in relevant industries for many years, proposes a kind of well head suspension assembly, to overcome the defect of prior art.
Utility model content
The purpose of this utility model is to provide a kind of well head suspension assembly, in the case of not destroying original steam-stimulated well well head, meets the needs of snubbing serving mounting process.
Another object of the present utility model is to provide a kind of well head suspension assembly, compact conformation, and heatproof is high, reusable.
The purpose of this utility model is achieved in that a kind of well head suspension assembly, and described well head suspension assembly includes:
Connector, the central authorities of described connector are provided with axial step through hole；The top of described axial step through hole be hole, big footpath, bottom be diameter holes；Ring-shaped step is formed between described hole, big footpath and described diameter holes；
Tubing hanger fitting, described tubing hanger fitting is tubulose, is coaxially located in described axial step through hole；Described tubing hanger fitting is provided with seal section, the external diameter of described seal section is identical with the internal diameter of described diameter holes, and described seal section be located in described diameter holes in formed and coordinate, form annular space between described seal section and hole, described big footpath inwall, in described annular space, be provided with sealing device；
Pressure cap, described pressure cap is sleeve-shaped, and thread bush is connected on the upper end of described tubing hanger fitting, and the external diameter of described pressure cap is identical with the internal diameter in hole, described big footpath, and described pressure cap is by the top closure of described annular space；The outer wall of described pressure cap is provided with annular stop portion；Described pressure cap and described tubing hanger fitting are articulated on described ring-shaped step by described sealing device；
Anti-channeling jackscrew, the horizontal tapped through hole of at least two it is provided with in the upper portion side wall of described connector, described anti-channeling jackscrew is threaded in described horizontal tapped through hole, the end of described anti-channeling jackscrew extend in hole, described big footpath with described annular stop portion against coordinating, and prevents from altering on described pressure cap and described tubing hanger fitting.
In a better embodiment of the present utility model, described tubing hanger fitting is ladder pipe, the top of described tubing hanger fitting be large-diameter pipe, bottom be small diameter tube；Described large-diameter pipe forms described seal section.
In a better embodiment of the present utility model, in described annular space, it is sequentially provided with spacer ring, multiple graphite-seal ring, spacer ring from bottom to up；Described spacer ring and described graphite-seal ring constitute described sealing device.
In a better embodiment of the present utility model, the upper end outer wall of described large-diameter pipe is provided with the threaded joints being connected with described pressure cap, and the upper end inwall of described large-diameter pipe is provided with the female thread for being connected with tubing string；Described small diameter tube is provided with the external screw thread for being connected with tubing string.
In a better embodiment of the present utility model, the inwall of described pressure cap is provided with connection screw thread, and the outer wall of described pressure cap is the stairstepping that lower diameter is big, upper diameter is little, and the diameter of described pressure cap outer wall bottom is identical with the internal diameter in hole, described big footpath；Forming the transition face of taper between bottom and the top of described pressure cap outer wall, described transition face forms described annular stop portion；The end of described anti-channeling jackscrew is taper, is resisted against on described transition face.
In a better embodiment of the present utility model, being provided with jackscrew sealing ring between the inwall of described anti-channeling jackscrew and described horizontal tapped through hole, described jackscrew sealing ring is compressed by packing pressure cap and seals.
In a better embodiment of the present utility model, the front portion of described anti-channeling jackscrew be thread segment, rear portion be cylindrical section；Described horizontal tapped through hole is sequentially formed with the first screw section, unthreaded hole section and the second screw section that internal diameter is sequentially reduced from outside to inside, thus forms first shoulder and the second shoulder；The thread segment of described anti-channeling jackscrew is connected with described second screw section, and described jackscrew seal ring set is located on described cylindrical section and is resisted against on described second shoulder；Described packing pressure cap is enclosed within described cylindrical section and threadeds with described first screw section, and one end of described packing pressure cap is pressed on described jackscrew sealing ring.
In a better embodiment of the present utility model, the top and bottom of described connector are respectively equipped with adpting flange；The upper surface of described tubing hanger fitting, described pressure cap upper surface all concordant with the adpting flange end face of described connector upper end；Described horizontal tapped through hole is located in the adpting flange of described connector upper end, and the adpting flange of described connector upper end is connected with adapter flange, the adpting flange of lower end is connected with big four.
From the above mentioned, this utility model compact conformation, safe and reliable, low cost, use are simple.Particularly in the case of not destroying original steam-stimulated well well head, it is achieved that tubing string is split type with adapter flange to be connected, and has both met the needs of snubbing serving mounting process, does not the most scrap original well head, economizes on resources.Using graphite-seal ring to hang to seal, sealing is reliable, heatproof is high.Only need to change graphite-seal ring after using the most reusable, reduce cost.Connector the most all uses standard flange to be connected with original well head, convenient installation, and suspension assembly is fixed by anti-channeling jackscrew, easy accessibility.
Accompanying drawing explanation
The following drawings is only intended to, in schematically illustrating this utility model and explaining, not limit scope of the present utility model.Wherein:
Fig. 1: for the structural representation of this utility model well head suspension assembly.
Fig. 2: for the enlarged diagram at I in Fig. 1.
Fig. 3: for the scheme of installation of this utility model well head suspension assembly.
Description of reference numerals:
100-well head suspension assembly；
10-connector；A-first shoulder；B-the second shoulder；
101-axial step through hole；
Hole, 1011-big footpath；
1012-diameter holes；
102-ring-shaped step；
The horizontal tapped through hole of 103-；
1031-the first screw section；
1032-unthreaded hole section；
1033-the second screw section；
104-adpting flange；
20-tubing hanger fitting；
201-large-diameter pipe；
202-small diameter tube；
30-pressure cap；
301-annular stop portion；
40-anti-channeling jackscrew；
401-thread segment；
402-cylindrical section；
50-annular space；
60-graphite-seal ring；
70-spacer ring；
80-jackscrew sealing ring；
90-packing pressure cap；
200-adapter flange；
300-big four；
The little four-way of 400-.
Detailed description of the invention
In order to be more clearly understood from technical characteristic of the present utility model, purpose and effect, now comparison accompanying drawing illustrates detailed description of the invention of the present utility model.
As it is shown in figure 1, this utility model provides a kind of well head suspension assembly 100, can be used for snubbing serving, shown in Fig. 1, be direction when this well head suspension assembly 100 is installed.Described well head suspension assembly 100 includes connector 10, tubing hanger fitting 20, pressure cap 30 and anti-channeling jackscrew 40.The central authorities of described connector 10 are provided with axial step through hole 101；The top of described axial step through hole 101 be hole, big footpath 1011, bottom be diameter holes 1012；Forming ring-shaped step 102 between hole, described big footpath 1011 and described diameter holes 1012, this ring-shaped step 102 plays main suspension strut effect.Described tubing hanger fitting 20 is tubulose, is coaxially located in described axial step through hole 101；Tubing hanger fitting 20 primarily serves connection tubing string and the effect of other wellhead component.Described tubing hanger fitting 20 is provided with seal section, the external diameter of described seal section is identical with the internal diameter of described diameter holes 1012, and described seal section be located in described diameter holes 1012 in formed and coordinate, annular space 50 is formed between described seal section and hole 1011, described big footpath inwall, being provided with sealing device in described annular space 50, sealing device can use graphite-seal ring 60 and spacer ring 70.The internal diameter of described graphite-seal ring 60 and spacer ring 70 is suitable with the diameter of described seal section, and external diameter is suitable with the internal diameter in hole, described big footpath 1011, can be sealed by annular space 50.Described pressure cap 30 is sleeve-shaped, thread bush is connected on the upper end of described tubing hanger fitting 20, the external diameter of described pressure cap 30 is identical with the internal diameter in hole, described big footpath 1011, thus the described graphite-seal ring 60 in annular space 50 and spacer ring 70 can be pressed on ring-shaped step 102 by described pressure cap 30 by the top closure of described annular space 50.Described pressure cap 30 and described tubing hanger fitting 20 are articulated on described ring-shaped step 102 by described spacer ring 70 and described graphite-seal ring 60.Being provided with the horizontal tapped through hole of at least two 103 in the upper portion side wall of described connector 10, the circumferencial direction at connector 10 is uniformly arranged, and described anti-channeling jackscrew 40 is threaded in described horizontal tapped through hole 103.The outer wall of described pressure cap 30 is provided with annular stop portion 301；The end of described anti-channeling jackscrew 40 extend in hole, described big footpath 1011 with described annular stop portion 301 against coordinating, and prevents from altering on described pressure cap 30 and described tubing hanger fitting 20.
Down-hole string can be linked together with other wellhead equipment by this well head suspension assembly 100 by tubing hanger fitting 20, and by the pressure cap 30 linked together with tubing hanger fitting 20, graphite-seal ring 60 and spacer ring 70 are pressed on the ring-shaped step 102 of connector 10, formed to hang and connect.Achieve down-hole string to be connected with the split type of wellhead equipment above, and need not change original well head composition, the needs of snubbing serving mounting process can be met.Use graphite-seal ring sealed suspension, seal reliable, heatproof height.Only need to change graphite-seal ring after using the most reusable, reduce cost.
Further, described tubing hanger fitting 20 is ladder pipe, the top of described tubing hanger fitting 20 be large-diameter pipe 201, bottom be small diameter tube 202；Described large-diameter pipe 201 forms described seal section, and described large-diameter pipe 201 is located in described diameter holes 1012, forms the annular space 50 of closing between the hole, big footpath 1011 of large-diameter pipe 201 and connector 10.In annular space 50, the outside of described large-diameter pipe 201 is arranged with described spacer ring 70,6 to 7 described graphite-seal rings 60, described spacer rings 70 the most successively.Graphite-seal ring 60 is clipped in the middle by two spacer rings 70；The described spacer ring 70 being positioned at bottom is resisted against on described ring-shaped step 102, and the described spacer ring 70 of the top is pressed on the lower end of described pressure cap 30.Tubing hanger fitting 20, pressure cap 30, spacer ring 70 and graphite-seal ring 60 constitute suspension assembly.Sealing function is produced when graphite-seal ring 60 is extruded.Or, described tubing hanger fitting 20 can not also use ladder pipe to use straight tube, and the external diameter of straight tube is identical with the internal diameter of described diameter holes 1012, threadeds with down-hole string in the lower end of this straight tube, and graphite-seal ring 60 and spacer ring 70 are directly sleeved on the outside of this straight tube.
Further, the upper end outer wall of described large-diameter pipe 201 is provided with the threaded joints being connected with described pressure cap 30, and the diameter of this threaded joints can be less than the diameter of large-diameter pipe 201.The upper end inwall of described large-diameter pipe 201 is provided with the female thread for being connected with tubing string or wellhead equipment；Described small diameter tube 202 is provided with the external screw thread for being connected with down-hole string.The inwall of described pressure cap 30 is provided with connection screw thread, and the outer wall of described pressure cap 30 is the stairstepping that lower diameter is big, upper diameter is little, and the diameter of described pressure cap 30 outer wall bottom is identical with the internal diameter in hole, described big footpath 1011.Forming the transition face of taper between bottom and the top of described pressure cap 30 outer wall, described transition face forms described annular stop portion 301；The end of described anti-channeling jackscrew 40 is taper, is resisted against on described transition face, prevents too high the making of down-hole pressure from altering on suspension assembly.Described annular stop portion 301 can also use other different version, such as, arranging the groove of a ring shape on the outer wall of pressure cap 30, the cell wall of groove can use bevel-faced form, the end of described anti-channeling jackscrew 40 is taper, is resisted against on the cell wall of groove generation stopping function.The width of groove can be larger, and leaves certain activity surplus.
Further, as in figure 2 it is shown, be provided with jackscrew sealing ring 80 between the inwall of described anti-channeling jackscrew 40 and described horizontal tapped through hole 103, described jackscrew sealing ring 80 is compressed by packing pressure cap 90 and seals.Packing pressure cap 90 is conventional standard component.Concrete, the front portion of described anti-channeling jackscrew 40 be thread segment 401, rear portion be cylindrical section 402.Along the circumferential direction it is evenly arranged with four horizontal tapped through holes 103, described horizontal tapped through hole 103 is sequentially formed with the first screw section 1031, unthreaded hole section 1032 and the second screw section 1033 that internal diameter is sequentially reduced from outside to inside, thus forms first shoulder a and the second shoulder b.The thread segment 401 of described anti-channeling jackscrew 40 is connected with described second screw section 1033, and described jackscrew sealing ring 80 is set on described cylindrical section 402 and is resisted against on described second shoulder b；Described packing pressure cap 90 is enclosed within described cylindrical section 402 and threadeds with described first screw section 1031, and one end of described packing pressure cap 90 is pressed on described jackscrew sealing ring 80, is compressed by jackscrew sealing ring 80 and seals.
Further, the top and bottom of described connector 10 are respectively equipped with adpting flange 104；The upper surface of described tubing hanger fitting 20, described pressure cap 30 upper surface all concordant with adpting flange 104 end face of described connector 10 upper end；Described horizontal tapped through hole 103 is located in the adpting flange 104 of described connector 10 upper end.Described top and bottom adpting flange 104 is standard flange, is connected by cylinder between upper lower flange, and the longitudinal profile of connector 10 is I shape.
As it is shown on figure 3, the adpting flange 104 of described connector 10 upper end is connected with adapter flange 200, the adpting flange 104 of lower end is connected with big four 300.Original shaft collar of steam-stimulated well is followed successively by big four 300, adapter flange 200, little four-way 400 from bottom to top, and down-hole string is directly connected on adapter flange 200 by screw thread.This utility model is on the basis of original well head, well head suspension assembly 100 of the present utility model is added between big four 300 and adapter flange 200, down-hole string is connected on the suspension assembly of well head suspension assembly 100, thus achieves down-hole string and be connected with the split type of adapter flange 200.When carrying out snubbing serving, just can remove adapter flange 200 and little four-way 400 after completing to manage interior closure, no killing well equipment is installed, then screws out anti-channeling jackscrew 40, utilize no killing well equipment to be tripped out together with tubing string outside well by suspension assembly, meet the needs of snubbing serving technique.
From the above mentioned, this utility model compact conformation, safe and reliable, low cost, use are simple.Particularly in the case of not destroying original steam-stimulated well well head, it is achieved that tubing string is split type with adapter flange to be connected, and has both met the needs of snubbing serving mounting process, does not the most scrap original well head, economizes on resources.Using graphite-seal ring to hang to seal, sealing is reliable, heatproof is high.Only need to change graphite-seal ring after using the most reusable, reduce cost.Connector the most all uses standard flange to be connected with original well head, convenient installation, and suspension assembly is fixed by anti-channeling jackscrew, easy accessibility.
The foregoing is only the schematic detailed description of the invention of this utility model, be not limited to scope of the present utility model.Any those skilled in the art, equivalent variations done on the premise of without departing from design of the present utility model and principle and amendment, the scope of this utility model protection all should be belonged to.
Claims (8)
1. a well head suspension assembly, it is characterised in that described well head suspension assembly includes:
Connector, the central authorities of described connector are provided with axial step through hole；The top of described axial step through hole be hole, big footpath, bottom be diameter holes；Ring-shaped step is formed between described hole, big footpath and described diameter holes；
Tubing hanger fitting, described tubing hanger fitting is tubulose, is coaxially located in described axial step through hole；Described tubing hanger fitting is provided with seal section, the external diameter of described seal section is identical with the internal diameter of described diameter holes, and described seal section be located in described diameter holes in formed and coordinate, form annular space between described seal section and hole, described big footpath inwall, in described annular space, be provided with sealing device；
Pressure cap, described pressure cap is sleeve-shaped, and thread bush is connected on the upper end of described tubing hanger fitting, and the external diameter of described pressure cap is identical with the internal diameter in hole, described big footpath, and described pressure cap is by the top closure of described annular space；The outer wall of described pressure cap is provided with annular stop portion；Described pressure cap and described tubing hanger fitting are articulated on described ring-shaped step by described sealing device；
Anti-channeling jackscrew, the horizontal tapped through hole of at least two it is provided with in the upper portion side wall of described connector, described anti-channeling jackscrew is threaded in described horizontal tapped through hole, the end of described anti-channeling jackscrew extend in hole, described big footpath with described annular stop portion against coordinating, and prevents from altering on described pressure cap and described tubing hanger fitting.
2. well head suspension assembly as claimed in claim 1, it is characterised in that described tubing hanger fitting is ladder pipe, the top of described tubing hanger fitting be large-diameter pipe, bottom be small diameter tube；Described large-diameter pipe forms described seal section.
3. well head suspension assembly as claimed in claim 1, it is characterised in that be sequentially provided with spacer ring, multiple graphite-seal ring, spacer ring in described annular space from bottom to up；Described spacer ring and described graphite-seal ring constitute described sealing device.
4. well head suspension assembly as claimed in claim 2, it is characterised in that the upper end outer wall of described large-diameter pipe is provided with the threaded joints being connected with described pressure cap, and the upper end inwall of described large-diameter pipe is provided with the female thread for being connected with tubing string；Described small diameter tube is provided with the external screw thread for being connected with tubing string.
5. well head suspension assembly as claimed in claim 1, it is characterized in that, the inwall of described pressure cap is provided with connection screw thread, and the outer wall of described pressure cap is the stairstepping that lower diameter is big, upper diameter is little, and the diameter of described pressure cap outer wall bottom is identical with the internal diameter in hole, described big footpath；Forming the transition face of taper between bottom and the top of described pressure cap outer wall, described transition face forms described annular stop portion；The end of described anti-channeling jackscrew is taper, is resisted against on described transition face.
6. well head suspension assembly as claimed in claim 1, it is characterised in that be provided with jackscrew sealing ring between the inwall of described anti-channeling jackscrew and described horizontal tapped through hole, described jackscrew sealing ring is compressed by packing pressure cap and seals.
7. well head suspension assembly as claimed in claim 6, it is characterised in that the front portion of described anti-channeling jackscrew be thread segment, rear portion be cylindrical section；Described horizontal tapped through hole is sequentially formed with the first screw section, unthreaded hole section and the second screw section that internal diameter is sequentially reduced from outside to inside, thus forms first shoulder and the second shoulder；The thread segment of described anti-channeling jackscrew is connected with described second screw section, and described jackscrew seal ring set is located on described cylindrical section and is resisted against on described second shoulder；Described packing pressure cap is enclosed within described cylindrical section and threadeds with described first screw section, and one end of described packing pressure cap is pressed on described jackscrew sealing ring.
8. the well head suspension assembly as according to any one of claim 1 to 7, it is characterised in that the top and bottom of described connector are respectively equipped with adpting flange；The upper surface of described tubing hanger fitting, described pressure cap upper surface all concordant with the adpting flange end face of described connector upper end；Described horizontal tapped through hole is located in the adpting flange of described connector upper end, and the adpting flange of described connector upper end is connected with adapter flange, the adpting flange of lower end is connected with big four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620331246.1U CN205638328U (en) | 2016-04-19 | 2016-04-19 | Well head suspension assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620331246.1U CN205638328U (en) | 2016-04-19 | 2016-04-19 | Well head suspension assembly |
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| Publication Number | Publication Date |
|---|---|
| CN205638328U true CN205638328U (en) | 2016-10-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620331246.1U Active CN205638328U (en) | 2016-04-19 | 2016-04-19 | Well head suspension assembly |
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| CN (1) | CN205638328U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313721A (en) * | 2017-05-04 | 2017-11-03 | 中石油煤层气有限责任公司 | Pumpingh well impressed current method anti-corrosive apparatus |
| CN108825161A (en) * | 2018-09-13 | 2018-11-16 | 江苏金石机械集团有限公司 | A kind of reducing casing head device |
| CN109989808A (en) * | 2019-04-30 | 2019-07-09 | 凯龙高科技股份有限公司 | A kind of anti-freeze type pressure switch for urea pump |
| CN113653458A (en) * | 2021-09-13 | 2021-11-16 | 上海神开石油设备有限公司 | Quick connection and disassembly structure for wellhead device |
| WO2024181967A1 (en) * | 2023-02-27 | 2024-09-06 | Halliburton Energy Services, Inc. | Housing joints with compression loaded graphite seals for downhole esp use |
-
2016
- 2016-04-19 CN CN201620331246.1U patent/CN205638328U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313721A (en) * | 2017-05-04 | 2017-11-03 | 中石油煤层气有限责任公司 | Pumpingh well impressed current method anti-corrosive apparatus |
| CN107313721B (en) * | 2017-05-04 | 2024-02-20 | 中石油煤层气有限责任公司 | External current method anticorrosion device for pumping well |
| CN108825161A (en) * | 2018-09-13 | 2018-11-16 | 江苏金石机械集团有限公司 | A kind of reducing casing head device |
| CN109989808A (en) * | 2019-04-30 | 2019-07-09 | 凯龙高科技股份有限公司 | A kind of anti-freeze type pressure switch for urea pump |
| CN113653458A (en) * | 2021-09-13 | 2021-11-16 | 上海神开石油设备有限公司 | Quick connection and disassembly structure for wellhead device |
| WO2024181967A1 (en) * | 2023-02-27 | 2024-09-06 | Halliburton Energy Services, Inc. | Housing joints with compression loaded graphite seals for downhole esp use |
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