CN209761409U - Micro-reducing thermal compensator for thermal production well - Google Patents
Micro-reducing thermal compensator for thermal production well Download PDFInfo
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- CN209761409U CN209761409U CN201920372198.4U CN201920372198U CN209761409U CN 209761409 U CN209761409 U CN 209761409U CN 201920372198 U CN201920372198 U CN 201920372198U CN 209761409 U CN209761409 U CN 209761409U
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- compensation
- compensation piston
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- piston
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 7
- 239000010779 crude oil Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model relates to a thermal production is little reducing heating power compensator for well. The technical scheme is as follows: the lower end of the casing coupling is connected with a compensation piston, the lower end of the compensation piston is provided with a plurality of high-temperature-resistant sealing rings and is connected with an inner cylinder of a compensation cylinder, a step at the upper end of the compensation cylinder and a part with a sealing structure at the lower end of the compensation piston are mutually limited, the lower end of the compensation piston is lapped on an inner hole of the lower adapter, and the lower adapter is connected with the lower casing coupling through a screw thread. The beneficial effects are that: the structure is simple, the implementation is easy, the construction operation difficulty is small, and the method has good adaptability to the well drilling and completion process. When hot steam is injected in future, the extension of the casing is completed by the compensation piston which has a sealing function, and the whole tool can completely reach all mechanical parameters of the casing string. The tool with a certain amount is added into the production pipe column, so that the service life of the casing pipe can be compensated by the extension of the casing pipe, the risks of well cementation during replacing the rubber plug and later operation are eliminated, and the recovery ratio of crude oil is improved.
Description
Technical Field
The utility model relates to a casing string structure of thermal recovery well in oil drilling well completion field, in particular to thermal recovery well is with little reducing heating power compensator.
Background
The thick oil in the petroleum field is heavy crude oil with high viscosity and poor fluidity, and is difficult to recover by adopting a conventional method. In the actual production process, people generally utilize the characteristic of strong temperature sensitivity of the thick oil to carry out thermal production on the thick oil, namely, various feasible methods are adopted to raise the temperature of the crude oil in the stratum so as to improve the fluidity of the thick oil, so that the crude oil can be produced from the stratum. The current methods for heavy oil thermal recovery mainly comprise a single-well steam injection swallowing-spitting method and a multi-well steam oil-flooding method. The most significant problems found in oil wells compared to conventional thin oil recovery methods are casing deformation, fracturing and leakage. Theoretical analysis shows that the steam injection temperature reaches 320-360 ℃, so that great thermal stress is generated, and the expansion and the elongation of the casing caused by the thermal stress are the main reasons for casing damage. The thermal expansion coefficient of the steel material is 1.2 x 105The extension of the wellhead of the thermal production well of 1000 plus 2000m reaches 20-80cm, which seriously influences the development effect and the service life of the oil well. Although the conventional common thermal compensator can solve the problem of extension of a part of sleeves, the inner diameter of a working stroke section is changed greatly and generally changes from phi 20 to phi 34mm, when a well cementation rubber plug passes through the common thermal compensator, the rubber plug is easy to overturn and is stuck to the thermal compensator, so that well cementation cannot be performed; even if the pipe passes through smoothly, in the later work such as well workover, operation in the future, the tubular column of going into also easily produces at heating power compensator step position and meets the circumstances of hindering, causes to meet and hinders the safety risk that takes place even appear the well head. Based on the present situation, it is necessary to have a thermal compensator with an unchanged inner diameter or a very small change to solve the problem of telescoping of the casing while ensuring that the situation of clamping and fixing the well piston does not occur, and the structure thereof does not bring risks to future operations.
Disclosure of Invention
The utility model aims at providing a little reducing thermal compensator for thermal production well to the above-mentioned defect that prior art exists, can effectively compensate the sleeve pipe extension, the internal diameter change only is about phi 6mm simultaneously, and the well cementation plug also does not have any chance through smooth and easy, operation in the future, well workover and hinders the risk. The tool has the characteristics of simple structure, small operation difficulty and small construction risk.
The technical scheme is as follows: the high-temperature-resistant sealing ring compensator comprises a casing coupling (1), a compensation piston (2), a high-temperature-resistant sealing ring (3), a compensation cylinder (4), a lower conversion joint (5) and a lower casing joint (6), wherein the lower end of the casing coupling (1) is connected with the compensation piston (2), the lower end of the compensation piston (2) is provided with a plurality of high-temperature-resistant sealing rings (3), the lower end of the compensation piston (2) is connected with an inner cylinder of the compensation cylinder (4), a step at the upper end of the compensation cylinder (4) and a part of the lower end of the compensation piston (2) with a sealing structure are mutually limited, the lower end of the compensation piston (2) is arranged on an inner hole of the lower conversion joint (5).
Preferably, the inner diameter of the lower adapter (5) is slightly larger than the outer diameter of the lower section of the compensation piston (2).
Preferably, above-mentioned compensation piston (2) include upper segment (2.1), step (2.2), hypomere (2.3), seal groove (2.4) and external screw thread (2.5), be step (2.2) between upper segment (2.1) and hypomere (2.3), be equipped with multichannel seal groove (2.4) in step (2.2) outer lane, be equipped with external screw thread (2.5) at the top of upper segment (2.1).
Preferably, the lower section (2.3) of the compensation piston (2) is inserted into the inner cavity of the lower adapter (5), and the length of the lower section (2.3) is smaller than that of the lower adapter (5).
preferably, three sealing grooves (2.4) are arranged on the outer ring of the step (2.2) and are matched with three groups of high-temperature-resistant sealing rings (3).
The utility model has the advantages that: the structure is simple, the implementation is easy, the construction operation difficulty is small, and the method has good adaptability to the well drilling and completion process. When hot steam is injected in future, the extension of the casing is completed by the compensation piston which has a sealing function, and the whole tool can completely reach all mechanical parameters of the casing string. The tool with a certain amount is added into the production pipe column, so that the service life of the casing pipe can be compensated by the extension of the casing pipe, the risks of well cementation during replacing the rubber plug and later operation are eliminated, and the recovery ratio of crude oil is improved. The utility model discloses simple structure easily realizes.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic diagram of a compensation piston;
FIG. 3 is a schematic structural view of a compensating cylinder;
FIG. 4 is a schematic structural view of a lower crossover joint;
In the upper diagram: the high-temperature-resistant compensating device comprises a casing coupling 1, a compensating piston 2, a high-temperature-resistant sealing ring 3, a compensating cylinder 4, a lower conversion joint 5 and a casing coupling 6; upper segment 2.1, step 2.2, hypomere 2.3, seal groove 2.4 and external screw thread 2.5.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Embodiment 1, refer to fig. 1-4, the utility model provides a thermal production is little reducing thermal compensator for well, including casing coupling 1, compensating piston 2, high temperature resistant sealing washer 3, a compensation section of thick bamboo 4, lower crossover sub 5, lower casing joint 6, compensating piston 2 is connected to the lower extreme of casing coupling 1, 2 lower extremes of compensating piston have multichannel high temperature resistant sealing washer 3, and with the inner tube of a compensation section of thick bamboo 4 be connected, the step of a compensation section of thick bamboo 4 upper end and the part that 2 lower extremes of compensating piston have seal structure are spacing each other, 2 lower extremes of compensating piston take on the hole of crossover sub 5 down, lower crossover sub 5 passes through the screw thread with lower casing coupling 6 and is connected. When the compensation piston 2 moves downwards, the front part of the compensation piston is lapped on the inner wall of the lower conversion joint 5 and moves downwards in the lower conversion joint 5 until the compensation piston 2 meets a limiting step.
In addition, the inner diameter of the lower adapter 5 is slightly larger than the outer diameter of the lower section of the compensation piston 2.
Referring to fig. 2, the compensation piston 2 includes an upper segment 2.1, a step 2.2, a lower segment 2.3, a sealing groove 2.4 and an external thread 2.5, the step 2.2 is arranged between the upper segment 2.1 and the lower segment 2.3, a plurality of sealing grooves 2.4 are arranged on the outer ring of the step 2.2, and the external thread 2.5 is arranged on the top of the upper segment 2.1.
Wherein, the lower section 2.3 of the compensation piston 2 is inserted into the inner cavity of the lower adapter 5, and the length of the lower section 2.3 is less than that of the lower adapter 5; three sealing grooves 2.4 are arranged on the outer ring of the step 2.2 and are matched with three groups of high-temperature resistant sealing rings 3; in addition, the thickness of the outer wall of the lower section is about phi 6 mm.
In use, the tool is connected in a string of casing, the positions and number of connections being connected according to the design requirements of "well design". The recommended addition distance is one per 400m, and generally 1-2 oil interval additions are made on the oil interval, and 2 oil interval additions are made from the oil interval to the wellhead. And the screwing torque is constructed according to the requirements of API standard so as to ensure the strength and the sealing property of the connection. The running process has no special requirements and can be carried out according to the normal casing running speed. After the whole pipe string is lowered to the well bottom, the well bottom is firstly detected, then the pipe string is lifted, the compensation piston is made to move to the upper end of the compensation cylinder, and then the casing is connected to the thermal production casing head at the well top.
During thermal recovery, when the sleeve is slightly reduced, the compensation piston 2 moves downwards, the front part of the compensation piston is lapped on the inner wall of the lower conversion joint 5 and moves downwards in the lower conversion joint 5 until the compensation piston 2 meets a limiting step; meanwhile, the inner diameter change is only about phi 6mm, and the well cementation rubber plug has no any risk of encountering resistance through smooth and future operation and well repair.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solutions described above. Therefore, any simple modifications or equivalent replacements made according to the technical solution of the present invention belong to the scope of the claimed invention as far as possible.
Claims (5)
1. a micro-reducing thermal compensator for a thermal production well is characterized in that: the high-temperature-resistant sealing ring compensator comprises a casing coupling (1), a compensation piston (2), a high-temperature-resistant sealing ring (3), a compensation cylinder (4), a lower conversion joint (5) and a lower casing coupling (6), wherein the lower end of the casing coupling (1) is connected with the compensation piston (2), the lower end of the compensation piston (2) is provided with a plurality of high-temperature-resistant sealing rings (3), the lower end of the compensation piston (2) is connected with an inner cylinder of the compensation cylinder (4), a step at the upper end of the compensation cylinder (4) and a part of the lower end of the compensation piston (2) with a sealing structure are mutually limited, the lower end of the compensation piston (2) is arranged on an inner hole of the lower conversion joint (5).
2. The micro-reducing thermal compensator for the thermal production well according to claim 1, wherein: the inner diameter of the lower adapter (5) is slightly larger than the outer diameter of the lower section of the compensation piston (2).
3. The micro-reducing thermal compensator for the thermal production well according to claim 1, wherein: compensation piston (2) include upper segment (2.1), step (2.2), hypomere (2.3), seal groove (2.4) and external screw thread (2.5), be step (2.2) between upper segment (2.1) and hypomere (2.3), be equipped with multichannel seal groove (2.4) in step (2.2) outer lane, be equipped with external screw thread (2.5) at the top of upper segment (2.1).
4. The micro-reducing thermal compensator for the thermal production well according to claim 1, wherein: the lower section (2.3) of the compensation piston (2) is inserted into the inner cavity of the lower adapter (5), and the length of the lower section (2.3) is smaller than that of the lower adapter (5).
5. The micro-reducing thermal compensator for the thermal production well according to claim 3, wherein: the outer ring of the step (2.2) is provided with three sealing grooves (2.4) which are matched with three groups of high-temperature resistant sealing rings (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920372198.4U CN209761409U (en) | 2019-03-22 | 2019-03-22 | Micro-reducing thermal compensator for thermal production well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920372198.4U CN209761409U (en) | 2019-03-22 | 2019-03-22 | Micro-reducing thermal compensator for thermal production well |
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| Publication Number | Publication Date |
|---|---|
| CN209761409U true CN209761409U (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920372198.4U Expired - Fee Related CN209761409U (en) | 2019-03-22 | 2019-03-22 | Micro-reducing thermal compensator for thermal production well |
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| Country | Link |
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| CN (1) | CN209761409U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109273A (en) * | 2020-08-26 | 2022-03-01 | 中国石油化工股份有限公司 | Safety device for thickened oil thermal production well |
-
2019
- 2019-03-22 CN CN201920372198.4U patent/CN209761409U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109273A (en) * | 2020-08-26 | 2022-03-01 | 中国石油化工股份有限公司 | Safety device for thickened oil thermal production well |
| CN114109273B (en) * | 2020-08-26 | 2024-04-19 | 中国石油化工股份有限公司 | Safety device for thickened oil thermal recovery well |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200302 Address after: 257000 No. 1076, North Road, Dongying District, Shandong, Dongying Patentee after: SHANDONG SHENGHAI SCIENCE AND TRADE Co.,Ltd. Address before: No. 680-1, Huanghe Road, Dongying District, Heze City, Shandong Province Patentee before: Dongying Yukun Petroleum Technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |