CN111287686B - Double-seal seat sealer and hanger - Google Patents
Double-seal seat sealer and hanger Download PDFInfo
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- CN111287686B CN111287686B CN202010179734.6A CN202010179734A CN111287686B CN 111287686 B CN111287686 B CN 111287686B CN 202010179734 A CN202010179734 A CN 202010179734A CN 111287686 B CN111287686 B CN 111287686B
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- seal
- sealing ring
- hanger
- seat seal
- flexible sealing
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- 238000007789 sealing Methods 0.000 claims abstract description 89
- 230000009471 action Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 5
- 230000008602 contraction Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000009977 dual effect Effects 0.000 description 6
- 239000004033 plastic Substances 0.000 description 4
- 239000002352 surface water Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910000978 Pb alloy Inorganic materials 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
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)
- Gasket Seals (AREA)
Abstract
The invention provides a double-seal seat sealer and a hanger. The invention relates to a double-seal seat sealer, comprising: an upper seat seal, a flexible sealing ring and a lower seat seal; the upper seat seal, the flexible sealing ring and the lower seat seal are connected in sequence; the flexible sealing ring can move up and down along with the lower seat seal. The invention solves the problem that the geothermal well sealing device fails when the geothermal well is in use.
Description
Technical Field
The invention relates to an energy development technology, in particular to a double-seal seat sealer and a hanger.
Background
The sealing of the common hanger for the sandstone geothermal well is realized by the dead weight of a non-two-open technical sleeve, and when the outer conical surface of the hanging seat sealer reaches a preset hanging position, the sealing is matched with the inner conical table of the male and female connector of the hanger which is installed in one open process to realize the hanging of the two-open sleeve. Meanwhile, the plastic lead alloy pre-cast on the outer conical surface of the seat sealer is subjected to the action of the dead weight of the sleeve, so that plastic deformation is realized, and all microscopic irregularities on two surfaces are filled between the male conical surface and the female conical surface, so that sealing is realized.
However, in the prior art, the sealing means of the geothermal well may fail in use, resulting in the flooding of surface water into the pump tube.
Disclosure of Invention
The invention provides a double-seal seat sealer and a hanger, which are used for solving the problem that a geothermal well sealing device fails when a geothermal well is used.
The invention provides a double-seal seat seal device, comprising:
An upper seat seal, a flexible sealing ring and a lower seat seal;
The upper seat seal, the flexible sealing ring and the lower seat seal are connected in sequence;
the flexible sealing ring can move up and down along with the lower seat seal.
Further, the upper seat seal, the flexible sealing ring and the lower seat seal are hollow in the axial direction and are used for accommodating the suspended object.
Furthermore, the outer side of the lower part of the lower seat seal is a conical surface.
Further, the flexible sealing ring is a rubber sealing ring.
Further, the flexible sealing ring comprises at least 2 groups of flexible sealing rings.
The present invention also provides a double seal hanger comprising:
An upper seat seal, a flexible sealing ring and a lower seat seal;
The upper seat seal, the flexible sealing ring and the lower seat seal are connected in sequence;
the outer side of the upper seat seal is connected with a male connector and a female connector of the hanger;
the flexible sealing ring is used for connecting with the male connector and the female connector of the hanger are connected in a sealing way;
the lower seat seal is used for being connected with the hanger male and female connector in a sealing way;
The flexible sealing ring can move up and down along with the lower seat seal;
the upper seat seal, the flexible sealing ring and the lower seat seal are hollow in the axial direction and are used for accommodating the sleeve.
Further, the outer side of the lower portion of the lower seat seal is a conical surface.
Further, the flexible sealing ring is a rubber sealing ring.
Further, the rubber seal ring comprises at least 2 groups of rubber seal rings.
The double-seal seat sealer and the hanger are characterized in that the upper seat sealer, the flexible sealing ring and the lower seat sealer form double seals, when the lower seat sealer fails, the lower seat sealer can also seal, the double seals of the hanger are realized, and the problem that a geothermal well sealing device fails when a geothermal well is used is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of a dual seal cartridge according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the operation of a dual seal seat sealer and hanger according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
FIG. 1 is a schematic view of the overall structure of a dual seal cartridge according to a first embodiment of the present invention; FIG. 2 is a schematic diagram illustrating the operation of a dual seal seat sealer and hanger according to the present invention. Referring to fig. 1 and 2, a dual seal cartridge of the present embodiment includes:
An upper seat seal 1, a flexible sealing ring 2 and a lower seat seal 3;
the upper seat seal 1, the flexible sealing ring 2 and the lower seat seal 3 are connected in sequence;
The flexible sealing ring 2 can move up and down along with the lower seat seal 3.
When the seat sealer in the embodiment is used, the outer side of the seat sealer is used for being connected with an external connector to realize sealing.
In this embodiment, the outer side of the seat sealer is connected with the external joint, and the outer side of the seat sealer may be an outer conical surface, which is matched with an inner conical table of the external joint to realize suspension sealing. The connection between the seat sealer and the external connector is not limited thereto, and other conventional connection methods can be adopted, which are not particularly limited in the present invention.
Optionally, the upper seat seal 1, the flexible sealing ring 2 and the lower seat seal 3 are hollow in the axial direction and are used for accommodating the suspended object 4;
In this embodiment, the seat sealer is axially hollow for accommodating a suspended object.
In this embodiment, when in use, the upper seat seal is fixedly connected with the external connector, which may be welded.
In this embodiment, during the use, flexible sealing washer and last seat seal fixed connection, accessible spot welding connection.
Optionally, the outer side of the lower part of the lower seat seal is a conical surface.
In this embodiment, the outer side of the lower portion of the lower seat seal is a tapered surface, so that the lower seat seal is matched with the connector, and the corresponding connector is provided with a tapered hole, so that sealing and supporting are realized during use.
Optionally, the flexible sealing ring is a rubber sealing ring.
Optionally, the flexible sealing ring comprises at least 2 groups of flexible sealing rings.
In this embodiment, the flexible sealing rings may specifically be multiple groups, for example, may be formed by sequentially arranging 4 groups of flexible sealing rings.
On the other hand, the invention also provides a double-seal hanger, which comprises the double-seal seat seal device, and specifically comprises the following components:
An upper seat seal 1, a flexible sealing ring 2 and a lower seat seal 3;
the upper seat seal 1, the flexible sealing ring 2 and the lower seat seal 3 are connected in sequence;
the outer side of the upper seat seal 1 is connected with a hanger male and female connector 5;
the flexible sealing ring 2 is in sealing connection with the hanger male and female connector 5;
the lower seat seal 3 is in sealing connection with the hanger male and female connector 5;
The flexible sealing ring 2 can move up and down along with the lower seat seal;
The upper seat seal 1, the flexible sealing ring 2 and the lower seat seal 3 are hollow in the axial direction and are used for accommodating the sleeve 6.
Optionally, the outer side of the lower portion of the lower seat seal is a conical surface.
Optionally, the flexible sealing ring is a rubber sealing ring.
Optionally, the rubber seal ring comprises at least 2 groups of rubber seal rings.
Fig. 2 is a schematic diagram of the operation of the dual seal seat and hanger according to the present invention, as shown in fig. 2, a is a schematic diagram before the hanger reaches a hanging position, B is a schematic diagram when the hanger reaches the hanging position, and C is a schematic diagram when the lower seat is lifted.
In the prior art, the sealing of the common hanger is realized by the dead weight of the sleeve pipe of a non-two-split technology, and when the outer conical surface of the hanging seat sealer reaches a preset hanging position, the sealing is matched with the inner conical table of the male and female connector of the hanger which is installed in one split process to realize the hanging of the two-split sleeve pipe. Meanwhile, the plastic lead alloy pre-cast on the outer conical surface of the seat sealer is subjected to the action of the dead weight of the sleeve, so that plastic deformation is realized, and all microscopic irregularities on two surfaces are filled between the male conical surface and the female conical surface, so that sealing is realized.
With the rapid increase of the development quantity of geothermal wells, the underground problems are more and more complicated, and when the geothermal wells are in actual use, the geothermal wells which are normally used for years suddenly reduce the water temperature, and the surface water floods into the pump pipe to greatly reduce the water temperature. After multiparty detection, the reason for surperficial water inflow is that the seal of the seat seal device fails. The seal failure is caused by the axial ascending displacement of the seat sealer relative to the male and female joint. The displacement causes the male and female connectors a circular seam is formed between the sealing surfaces of the frustum, resulting in seal failure.
Further searching the reason for the ascending displacement of the seat sealer, finding that the annular seam formed by the technical casing and the well hole is collapsed and filled by the well wall, and forming a blocking at a certain position. The blocking point is up and down, and when the temperature of geothermal water changes, the technical sleeve can axially linearly stretch along with the temperature rise. When the resistance of the tail end of the sleeve is smaller than the resistance of the blocking point, the linear extension directions of the blocking point are opposite. The linear extending direction above the blocking point is upward, and the linear extending direction below the blocking point is downward. When the end of the sleeve is blocked (fixed), the linear extension of all the sleeves overcomes the resistance of the blocking points, and all the sleeves extend upwards and jack up the seat sealer upwards, so that the sealing surface forms an annulus.
In the embodiment, the seat seal device is matched with a male connector and a female connector to realize sealing when in use, the lower seat seal and the connectors realize sealing, and the flexible rubber ring is axially compressed to be shortened and radially expanded when in suspension. When the contact with the inner hole of the joint is limited, after the axial contraction and the radial expansion reach balance, the hanging and sealing actions are stopped, the internal stress of the flexible rubber ring reaches balance, and at the moment, the lower seat seal locks the hanging group string into a whole, so that the sealing component similar to a piston is formed. Even if the seat sealer is heated and jacked, the sealing state of the piston can be axially carried out in the joint inner hole, surface water cannot enter the pump type pipe, the productivity stability and the temperature of the sandstone geothermal well are guaranteed to be free from being reduced, and the problem that the geothermal well sealing device fails when the geothermal well is used is solved.
The seat seal in this embodiment may be used in other similar devices and is not limited to a geothermal well hanger.
In this embodiment, the following conditions are met when the geothermal well casing is hung and sealed:
1) When the two-opening technical sleeve is put in, the position is positioned in the middle by dead weight suspension;
2) On the premise of no external force action after the sleeve is in place, the hanging and sealing actions are reliably completed by means of the gravity of the sleeve;
3) Allowing for corresponding displacement of the seal assembly when the downhole temperature changes, but without affecting the sealing performance.
The following is a double seal hanger sealability calculation:
the sleeve is known to have a dead weight T (kg) and after reaching the hanging position the force is applied entirely to the rubber seal, the resulting pressure being P. Where D2 is the diameter of the upper seat sealer 1, i.e. the diameter of the hanger, and A2 is the diameter of the sleeve 6.
Then
Under the action of the pressure, the flexible rubber ring is compressed and shortened axially and expanded radially. When the inner hole of the dial sleeve is limited in contact, after the axial contraction and the radial expansion reach balance, the hanging and sealing actions are stopped, the internal stress of the flexible rubber ring reaches balance, and at the moment, the locking mechanism in the lower seat seal locks the hanging group string into a whole to form a sealing component similar to a piston. Even if the two open sleeves are heated to push up, the assembly can only axially do piston movement in a sealing state in the inner hole of the male and female connector, surface water cannot enter the pump type pipe, and the productivity stability and the temperature of the sandstone geothermal well are ensured not to be reduced.
The hanger bearing pressure is also equal to P.
The pressure P increases with the number of double entry casings, calculated as double entry steel grade N80, Φ177.8X9.19 casing 1000m, the theoretical casing weight T=1000 m×38.7 kg/m= 38700kg. The sealing aperture of the male and female connectors is phi 320mm.
Pressure is then
Taking 1000m as a reference meter, dividing the meter L of the sleeve to 1000 for different well depths, and calculating a coefficient n (namely). The well seal pressure bearing capacity p=7n can be calculated.
The hanger has been tested in more than 80 wells so far, and has good use effect without a case of suspension seal failure.
According to the double-seal seat sealer and the hanger, the upper seat sealer, the flexible sealing ring and the lower seat sealer form double seals, so that the sealing assembly is allowed to perform corresponding displacement, the lower seat sealer is possibly sealed when being invalid, the hanger is sealed, and the problem that a geothermal well sealing device is invalid when the geothermal well is used is solved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. A double-sealing hanger which comprises a hanger body, characterized by comprising the following steps:
An upper seat seal, a flexible sealing ring and a lower seat seal;
the upper seat seal, the flexible sealing ring and the lower seat seal are connected in sequence;
the outer side of the upper seat seal is connected with a male connector and a female connector of the hanger;
the flexible sealing ring is used for connecting with the male connector and the female connector of the hanger are connected in a sealing way;
the lower seat seal is used for being connected with the hanger male and female connector in a sealing way;
The flexible sealing ring can move up and down along with the lower seat seal;
the upper seat seal, the flexible sealing ring and the lower seat seal are axially hollow and are used for accommodating the sleeve;
the outer side of the lower part of the lower seat seal is a conical surface, and is matched with a male connector and a female connector of a hanger to realize hanging;
When the flexible sealing ring is hung, the flexible sealing ring is axially compressed and shortened, the flexible sealing ring radially expands, after the axial contraction and the radial expansion reach balance, the hanging and sealing actions are stopped, the internal stress of the flexible sealing ring reaches balance, and at the moment, a locking mechanism in the lower seat seal locks the hanging group in series into a whole to form a sealing assembly similar to a piston;
The following conditions are satisfied when the geothermal well casing is hung and sealed:
1) When the two-opening technical sleeve is put in, the position is positioned in the middle by dead weight suspension;
2) On the premise of no external force action after the sleeve is in place, the hanging and sealing actions are reliably completed by means of the gravity of the sleeve;
3) Allowing for corresponding displacement of the seal assembly when the downhole temperature changes, but without affecting the sealing performance.
2. The hanger according to claim 1, wherein,
The flexible sealing ring is a rubber sealing ring.
3. The hanger according to claim 2, wherein,
The rubber seal ring comprises at least 2 groups of rubber seal rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010179734.6A CN111287686B (en) | 2020-03-13 | 2020-03-13 | Double-seal seat sealer and hanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010179734.6A CN111287686B (en) | 2020-03-13 | 2020-03-13 | Double-seal seat sealer and hanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111287686A CN111287686A (en) | 2020-06-16 |
| CN111287686B true CN111287686B (en) | 2024-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010179734.6A Active CN111287686B (en) | 2020-03-13 | 2020-03-13 | Double-seal seat sealer and hanger |
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| Country | Link |
|---|---|
| CN (1) | CN111287686B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266297B (en) * | 2021-05-26 | 2024-10-22 | 中石化绿源地热能(陕西)开发有限公司 | A special sealing suspension system and well body structure for production and irrigation in the same well |
| CN113266300B (en) * | 2021-05-26 | 2025-01-07 | 中石化绿源地热能(陕西)开发有限公司 | Compensation packer in the same well production and irrigation pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205012957U (en) * | 2015-10-16 | 2016-02-03 | 中国石油化工集团公司 | Sealed hanger |
| CN210087290U (en) * | 2019-04-01 | 2020-02-18 | 中国石油化工股份有限公司 | Packer for closed pipe column |
| CN212716523U (en) * | 2020-03-13 | 2021-03-16 | 中石化绿源地热能(陕西)开发有限公司 | Double-seal setting device and hanger |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5031695A (en) * | 1990-03-30 | 1991-07-16 | Fmc Corporation | Well casing hanger with wide temperature range seal |
| CN2484403Y (en) * | 2001-06-05 | 2002-04-03 | 中国石化胜利油田有限公司滨南采油厂井下作业公司 | Sliding-seat shut-in device for well |
| CN2660105Y (en) * | 2003-12-02 | 2004-12-01 | 盘锦昌明电子有限责任公司 | Oil agent hot extraction packer |
| CN203488138U (en) * | 2013-09-28 | 2014-03-19 | 新疆华油技术服务股份有限公司 | Suspension device of coiled tubing wellhead |
| CN204457585U (en) * | 2015-01-07 | 2015-07-08 | 中国海洋石油总公司 | Double containment two-seater envelope thermal packer |
| CN207569204U (en) * | 2017-10-24 | 2018-07-03 | 什邡慧丰采油机械有限责任公司 | The sealing structure of boll-weevil hanger |
-
2020
- 2020-03-13 CN CN202010179734.6A patent/CN111287686B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205012957U (en) * | 2015-10-16 | 2016-02-03 | 中国石油化工集团公司 | Sealed hanger |
| CN210087290U (en) * | 2019-04-01 | 2020-02-18 | 中国石油化工股份有限公司 | Packer for closed pipe column |
| CN212716523U (en) * | 2020-03-13 | 2021-03-16 | 中石化绿源地热能(陕西)开发有限公司 | Double-seal setting device and hanger |
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| Publication number | Publication date |
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| CN111287686A (en) | 2020-06-16 |
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