CN108843272B - Recoverable pressure relief tool for releasing annular confining pressure and well completion well structure - Google Patents
Recoverable pressure relief tool for releasing annular confining pressure and well completion well structure Download PDFInfo
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- CN108843272B CN108843272B CN201810627556.1A CN201810627556A CN108843272B CN 108843272 B CN108843272 B CN 108843272B CN 201810627556 A CN201810627556 A CN 201810627556A CN 108843272 B CN108843272 B CN 108843272B
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- valve body
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
Abstract
The invention relates to a recoverable pressure relief tool for releasing annulus trapping pressure, which comprises a main body, a pressure sensing chamber, a pressure sensing film, an engine oil chamber and a slide valve, wherein the pressure sensing chamber, the pressure sensing film, the engine oil chamber and the slide valve are arranged on the main body; the pressure sensing chamber is positioned in the middle of the main body, one side of the pressure sensing chamber is communicated with the annular trap through a flow channel, and the annular trap is a closed space formed by a sleeve, an outer-layer sleeve, a sleeve cement ring and an underwater wellhead; a filtering screen is arranged between the overflowing channel and the pressure sensing chamber; an organic oil chamber is arranged on the other side of the pressure sensing chamber, the engine oil chamber is arranged in parallel with the pressure sensing chamber, and a pressure sensing film is arranged between the engine oil chamber and the pressure sensing chamber; a slide valve is arranged at the bottom of the engine oil chamber; thereby guaranteeing the integrity of the shaft and effectively simplifying the installation. Meanwhile, the invention also discloses a well completion well body structure of the deepwater oil and gas well, which comprises the pressure relief tool, wherein the pressure relief tool has the beneficial effects.
Description
Technical Field
The invention relates to a pressure relief tool, in particular to a recoverable pressure relief tool for releasing annular confining pressure applied in the production process of a deepwater oil-gas well and a well completion well body structure.
Background
High temperature fluid during production transfers heat to the sealed annulus fluid during production, causing the sealed annulus fluid to expand when heated resulting in an increase in annulus confining pressure with the risk of crushing or bursting the casing. The annulus between the production string and the production casing may be relieved of its liquid expansion volume by an annulus relief valve on the subsea wellhead to which it is connected. For the other annuli, no pressure relief passage exists. At present, rupture discs and compressible foam are mainly adopted for pressure relief in annular confinement pressure treatment measures and projects for other annuluses, the method can only perform pressure relief once, the integrity of a shaft can be damaged after the rupture discs work, and the mounting process of the rupture discs and the compressible foam is complex.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a recoverable pressure relief tool for releasing annulus trapping pressure and a well completion well structure, which not only can realize recoverable pressure relief to ensure the integrity of a wellbore, but also can effectively simplify the installation and use processes of the pressure relief tool.
In order to achieve the purpose, the invention adopts the following technical scheme: a recoverable pressure relief tool that releases annulus trapping pressure which characterized in that: the filter screen comprises a main body, and an overflowing channel, a filter screen, a pressure sensing chamber, a pressure sensing film, an engine oil chamber and a slide valve which are arranged on the main body; the pressure sensing chamber is positioned in the middle of the main body, one side of the pressure sensing chamber is communicated with the annular trap through the overflowing channel, and the annular trap is a closed space formed by surrounding a sleeve, an outer-layer sleeve, a sleeve cement ring and an underwater wellhead; the filtering screen is arranged on one side of the overflowing channel and between the overflowing channel and the pressure sensing chamber; the engine oil chamber is arranged on the other side of the pressure sensing chamber, the engine oil chamber is arranged in parallel with the pressure sensing chamber, and the pressure sensing film is arranged between the engine oil chamber and the pressure sensing chamber; the sliding valve is arranged at the bottom of the engine oil chamber.
Further, the spool valve includes a valve body, a pressure release chamber, a pressure release passage, an elastic body, and a valve body seat; the top of the valve body is connected with the bottom of the engine oil chamber, the bottom of the valve body is provided with the valve body base, the valve body base is provided with the elastic body, and the elastic body is positioned between the valve body base and the bottom of the valve body; the two sides of the middle part of the valve body are respectively provided with the pressure release channels, and the pressure release channels are plugged under the action of the elastic bodies; and the pressure release chamber is arranged in the valve body and is positioned above the pressure release channel.
And furthermore, a group of metal sealing rings are symmetrically arranged at the upper end and the lower end of the valve body base, the upper end and the lower end of the elastic body and the upper end and the lower end of the pressure release cavity respectively.
Further, the elastic body applies a starting pressure to the valve body, when the pressure generated by the liquid in the engine oil chamber being extruded by the pressure sensing film is greater than the starting pressure, the valve body compresses the elastic body, and the pressure release chamber is communicated with the pressure release channel and is in a pressure release state; when the pressure generated by the liquid in the engine oil chamber being squeezed by the pressure sensing film is smaller than the starting pressure, the elastic body is in a free state, the valve body blocks the pressure release channel, and the pressure release chamber is not communicated with the pressure release channel and is in a closed state.
Furthermore, the elastic body, the pressure sensing film and the engine oil chamber form a force adjusting mechanism, and the starting pressure and the closing pressure are adjusted through the length of the elastic body and the type of the pressure sensing film and the sectional area of the engine oil chamber.
Further, a pressure safety valve is arranged on the other side of the overflowing channel, and is pre-provided with a rupture pressure which is greater than the maximum pressure borne by the pressure safety valve in the well cementation process and smaller than the starting pressure of the pressure relief tool; the starting pressure of the pressure relief tool is smaller than the maximum pressure allowed by the outer annular space.
Further, a cavity for accommodating the valve body and the valve seat is arranged in the main body, and the valve body can move in the cavity.
Further, the pressure relief tool is arranged in the casing coupling, and the length direction of the cavity is parallel to the axial direction of the casing coupling.
Further, the deformation direction of the elastic body is the same as the length direction of the chamber, and the elastic body is a cylindrical spring.
A well completion well bore structure of deep water oil gas well, it includes above-mentioned pressure release instrument.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the method is used for treating the problem of the deep water annular confinement pressure. After entering the well, not only can realize many times pressure release and resume, can also guarantee the integrality of pit shaft to a certain extent. 2. In the installation and use process, the tool is installed only by completing the basic casing running operation process without additional special operation, and the installation and use process is simpler and quicker. 3. The invention has simple structure, low manufacturing cost, long service life and high reliability, and is beneficial to protecting the integrity of the shaft of the deepwater oil-gas well.
Drawings
FIG. 1 is a schematic view of a pressure relief tool of the present invention;
FIG. 2 is a well bore structure view of a deep well of the present invention;
fig. 3 is a view of the installation of the pressure relief tool of the present invention in fig. 2.
Detailed Description
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The invention is described in detail below with reference to the figures and examples.
The invention provides a recoverable pressure relief tool for releasing annulus trapping pressure, which is used for preventing the damage of the annulus trapping pressure generated in a deep water oil and gas well in a production process to a wellbore, as shown in figure 1. The annular ring pressure recovery device comprises a main body 1 of a recoverable annular ring closing pressure relief tool, and a pressure sensing chamber 2, a flow passage 3, a filtering screen 4, a pressure safety valve 5, an engine oil chamber 6, a pressure sensing film 7 and a slide valve which are arranged on the main body 1.
The pressure sensing chamber 2 is positioned in the middle of the main body 1, one side of the pressure sensing chamber 2 is communicated with the annular trap 8 through the flow channel 3, and the annular trap 8 is a closed space formed by surrounding a casing 9, an outer casing, a casing cement sheath 10 and an underwater wellhead 11; the device is located on one side of the overflowing channel 3, a filtering screen 4 is arranged between the overflowing channel 3 and the pressure sensing chamber 2, a pressure safety valve 5 is arranged on the other side of the overflowing channel 3, rupture pressure is preset in the pressure safety valve 5, and the rupture pressure is higher than the maximum pressure borne by the recoverable annular confinement pressure relief tool during well cementation so as to protect the recoverable annular confinement pressure relief tool from being damaged before the problem of annular confinement pressure is solved. The other side of the pressure sensing cavity 2 is provided with an engine oil chamber 6, the engine oil chamber 6 is arranged in parallel with the pressure sensing cavity 2, and a pressure sensing film 7 is arranged between the engine oil chamber 6 and the pressure sensing cavity 2. A slide valve is arranged at the bottom of the engine oil chamber 6.
In the above embodiment, the spool valve includes the valve body 12, the valve body seat 13, the elastic body 14, the pressure release passage 15, the pressure release chamber 16, and the metal seal ring 17. The top of the valve body 12 is connected with the bottom of the engine oil chamber 6, the bottom of the valve body 12 is provided with a valve body base 13, an elastic body 14 is arranged on the valve body base 13, the elastic body 14 is positioned between the valve body base 13 and the bottom of the valve body 12, and the elastic body 14 is used for applying starting pressure to the valve body 12. Two sides of the middle part of the valve body 12 are respectively provided with a pressure release channel 15, and the pressure release channels 15 are blocked under the action of the elastic body 14; located above the pressure relief passage 15, a pressure relief chamber 16 is provided within the valve body 12. Wherein, a group of metal sealing rings 17 are respectively and symmetrically arranged at the upper and lower ends of the valve body base 13, the upper and lower ends of the elastic body 14 and the upper and lower ends of the pressure release chamber 16. When the pressure relief valve is used, when the pressure generated by the liquid in the engine room 6 extruded by the pressure sensing film 7 is greater than the starting pressure of the valve body 12, the valve body 12 compresses the elastic body 14, and the pressure relief chamber 16 is communicated with the pressure relief channel 15 and is in a pressure relief state; when the pressure generated by the liquid in the engine oil chamber 6 after being extruded by the pressure sensing film 7 is smaller than the starting pressure of the valve body 12, the elastic body 14 is in a free state, the valve body 12 blocks the pressure release channel 15, and the pressure release chamber 16 is not communicated with the pressure release channel 15 and is in a closed state.
In the above embodiments, the body 1 of the pressure relief tool of the present invention is fixedly disposed within the casing collar 18, and may also be disposed within a casing centralizer or within a casing body.
In the above embodiment, the main body 1 is provided with a chamber for accommodating the valve body 12 and the valve body base 13, and the valve body 12 can move in the chamber. The shape of the chamber is not limited in this embodiment, and may be a cylindrical chamber, a rectangular parallelepiped chamber, or the like, which is adapted to the shape of the main body 1.
In a preferred embodiment, as shown in FIG. 2, the length of the chamber is parallel to the axis of the casing collar 18, and the elastomer 14 can flex along the length of the chamber.
In the above embodiments, the initial state of the elastomer 14 is a free state, and the recoverable annular trap pressure relief tool is closed in the elastomer free state. The activation pressure of the valve body 12 can be controlled by controlling the amount of compression of the elastomer 14.
In each of the above embodiments, the deformation direction of the elastic body 14 is the same as the longitudinal direction of the chamber. The elastic body 14 is preferably a cylindrical spring, and a tower spring, a coil spring, or the like may be used as the elastic body 14.
In the above embodiments, the elastic body 14, the pressure sensing film 7 and the oil chamber 6 constitute a force adjusting mechanism to precisely control the opening and closing timing of the pressure relief tool. The starting pressure and the closing pressure are adjusted by the sectional area of the engine oil chamber 6 according to the length of the elastic body 14 and the type of the pressure sensing film 7. When the force adjusting mechanism sets the starting pressure, the problem of annular confinement pressure is solved; the force adjustment mechanism sets the shut-off pressure to ensure wellbore integrity when no trapping pressure problem exists. The restorability of the restorable annular confinement pressure relief tool is realized through the force adjusting mechanism.
In a preferred embodiment, the recoverable annulus trap pressure relief tool is used for one-way pressure relief from the outer annulus to the inner annulus.
In each embodiment, the rupture pressure of the pressure safety valve 5 is greater than the maximum pressure borne by the pressure safety valve 5 in the well cementation process and is less than the starting pressure of the recoverable annular trapping pressure relief tool; the starting pressure of the recoverable annular trap pressure relief tool should be less than the maximum pressure allowed in the outer annulus.
When the annular trap 8 is used, when the fluid of the annular trap 8 is heated and expanded due to the heat transfer of high-temperature fluid in the production string, the expanded fluid breaks the pressure safety valve 5 and flows through the flow passage 3 and the filtering screen 4; the pressure sensing film 7 is expanded by the fluid in the annular trap 8 to deform, and an engine oil chamber 6 at the right end of the pressure sensing film 7 is extruded; the engine oil in the engine oil chamber 6 generates hydraulic pressure to push the valve body 12 to compress the elastic body 14, and the pressure release chamber 16 is communicated with the pressure release channel 15; the expansion fluid of the outer annular trap 8 flows into the relatively low-pressure space of the inner annular trap through the pressure release chamber 16 and the pressure release channel 15, so that the pressure balance of the inner annular trap and the outer annular trap is achieved, and the recoverable annular trap pressure relief tool is in an open state; when the pressure generated by the liquid in the engine oil chamber 6 after being extruded by the pressure sensing film 7 is smaller than the starting pressure of the valve body 12, the elastomer 14 is always in a free state to block the communication of the inner ring and the outer ring hollow trap, and the recoverable annular trap pressure relief tool is in a closed state.
It can be seen that the recoverable pressure relief tool 19 in this embodiment applies an activation pressure to the valve body 12 via the elastomer 14 such that the outer annulus trapping fluid caused by heat transfer from the high temperature fluid in the production string is only able to flow in one direction to the inner annulus trapping 8; when the pressure of the external annular trap 8 is higher than the maximum pressure allowed by the annulus for the first time, the pressure safety valve 5 is broken by extrusion, and the pressure safety valve 5 can prevent the recoverable annular trap pressure relief tool from being damaged by the well cementation process before being broken, so that the integrity of the recoverable pressure relief tool 19 is ensured. When the hydraulic pressure of the oil chamber 6 caused by the pressure of the outer annular trap 8 is smaller than the starting pressure generated by the elastic body 14, the elastic body 14 recovers the free state, and the valve body 12 blocks the pressure release passage 15, so that the integrity of a shaft of the deepwater oil-gas well is ensured. When the pressure of the outer annular trap 8 rises again in the production process and the hydraulic pressure of the oil chamber 6 is higher than the starting pressure generated by the elastic body 14, the elastic body 14 is compressed again, so that the pressure release chamber 16 is communicated with the pressure release channel 15 again, the pressure of the outer annular trap is relieved, and the recoverability of the pressure relief tool is realized.
As shown in fig. 2 and 3, the invention also provides a well completion and well bore structure of a deep water oil and gas well, which comprises the casing coupling type recoverable pressure relief tool for releasing the annulus trapping pressure, a subsea wellhead 11, a casing 9 and a casing cement sheath 10. An annular trap 8 is arranged between the casing 9 and the outer casing, and between the casing cement sheath 10 and the underwater wellhead 11; the casing 9 is provided with a casing coupling 18 with a recoverable pressure relief tool 19; the recoverable pressure relief tool 19 may communicate with the inner and outer annulus traps 8 of the casing.
The sleeve 9 comprises a production sleeve, a technical sleeve and a surface sleeve; the recoverable pressure relief tools 19 are arranged at the cement return height of the production casing by 100m, are symmetrically arranged in two groups at 180 degrees and are used for controlling the fluid expansion pressure in an annular trap consisting of the production casing, the technical casing, the underwater wellhead and a cement ring outside the production casing; a recoverable pressure relief tool 19 on the production casing controls the annulus trap outside the production casing to relieve pressure to the annulus trap inside the production casing. The recoverable annular confinement pressure relief tools are arranged at the position 100m higher than the cement of the technical casing, are symmetrically arranged in two groups at 180 degrees and are used for treating the fluid expansion pressure in the annular confinement consisting of the technical casing, the surface casing, the underwater wellhead and the cement ring outside the technical casing; a recoverable pressure relief tool 19 on the technical casing can control the annular trap outside the technical casing to relieve pressure to the annular trap inside the technical casing; the annular trap can only release pressure from the outer layer to the inner layer in one way.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. A recoverable pressure relief tool that releases annulus trapping pressure which characterized in that: the filter screen comprises a main body, and an overflowing channel, a filter screen, a pressure sensing chamber, a pressure sensing film, an engine oil chamber and a slide valve which are arranged on the main body;
the pressure sensing chamber is positioned in the middle of the main body, one side of the pressure sensing chamber is communicated with the annular trap through the overflowing channel, and the annular trap is a closed space formed by surrounding a sleeve, an outer-layer sleeve, a sleeve cement ring and an underwater wellhead; the filtering screen is arranged on one side of the overflowing channel and between the overflowing channel and the pressure sensing chamber; the engine oil chamber is arranged on the other side of the pressure sensing chamber, the engine oil chamber is arranged in parallel with the pressure sensing chamber, and the pressure sensing film is arranged between the engine oil chamber and the pressure sensing chamber; the sliding valve is arranged at the bottom of the engine oil chamber.
2. The pressure relief tool of claim 1, wherein: the slide valve comprises a valve body, a pressure release chamber, an elastic body and a valve body base; the top of the valve body is connected with the bottom of the engine oil chamber, the bottom of the valve body is provided with the valve body base, the valve body base is provided with the elastic body, and the elastic body is positioned between the valve body base and the bottom of the valve body; the pressure release chamber is arranged in the valve body; the pressure relief tool is arranged in a casing coupling, a pressure release channel is arranged on the casing coupling, and the pressure release channel is plugged under the action of the elastomer or is communicated with the pressure release chamber.
3. The pressure relief tool of claim 2, wherein: and a group of metal sealing rings are symmetrically arranged at the upper end and the lower end of the valve body base, the upper end and the lower end of the elastic body and the upper end and the lower end of the pressure release cavity respectively.
4. The pressure relief tool of claim 3, wherein: the elastic body applies a starting pressure to the valve body, when the pressure generated by the liquid in the engine oil chamber being extruded by the pressure sensing film is greater than the starting pressure, the valve body compresses the elastic body, and the pressure release chamber is communicated with the pressure release channel and is in a pressure release state; when the pressure generated by the liquid in the engine oil chamber being squeezed by the pressure sensing film is smaller than the starting pressure, the elastic body is in a free state, the valve body blocks the pressure release channel, and the pressure release chamber is not communicated with the pressure release channel and is in a closed state.
5. The pressure relief tool of claim 4, wherein: the elastic body, the pressure sensing film and the engine oil chamber form a force adjusting mechanism, and the starting pressure and the closing pressure are adjusted through the length of the elastic body and the type of the pressure sensing film and the sectional area of the engine oil chamber.
6. The pressure relief tool according to any of claims 1 to 5, wherein: a pressure safety valve is arranged on the other side of the overflowing channel, and is pre-provided with a rupture pressure which is greater than the maximum pressure borne by the pressure safety valve in the well cementation process and less than the starting pressure of the pressure relief tool; the starting pressure of the pressure relief tool is smaller than the maximum pressure allowed by the outer annular space.
7. The pressure relief tool according to any of claims 2 to 5, wherein: the valve body can move in the cavity for accommodating the valve body and the valve body base.
8. The pressure relief tool of claim 7, wherein: the length direction of the chamber for containing the valve body and the valve body base is parallel to the axial direction of the casing coupling.
9. The pressure relief tool of claim 7, wherein: the deformation direction of the elastic body is the same as the length direction of the chamber for accommodating the valve body and the valve body base, and the elastic body is a cylindrical spring.
10. A completed well bore structure for a deep water oil and gas well comprising a pressure relief tool according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810627556.1A CN108843272B (en) | 2018-06-19 | 2018-06-19 | Recoverable pressure relief tool for releasing annular confining pressure and well completion well structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810627556.1A CN108843272B (en) | 2018-06-19 | 2018-06-19 | Recoverable pressure relief tool for releasing annular confining pressure and well completion well structure |
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| CN108843272A CN108843272A (en) | 2018-11-20 |
| CN108843272B true CN108843272B (en) | 2020-06-30 |
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| CN201810627556.1A Active CN108843272B (en) | 2018-06-19 | 2018-06-19 | Recoverable pressure relief tool for releasing annular confining pressure and well completion well structure |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964887B (en) * | 2020-08-17 | 2022-04-12 | 西南石油大学 | Casing annulus pressure relief tool simulation experiment device and test method |
| CN113187427B (en) * | 2021-04-28 | 2022-11-29 | 中国海洋石油集团有限公司 | Drilling-through type underwater horizontal Christmas tree and wellhead system |
| CN114263438B (en) * | 2021-12-15 | 2023-12-08 | 中海石油(中国)有限公司 | Device and method for releasing sleeve bypass annular pressure of deep water oil-gas well |
| CN114961645B (en) * | 2022-05-23 | 2023-03-10 | 西南石油大学 | Multi-activation bidirectional pressure relief device and method for releasing annular trapping pressure of sleeve |
| CN114961643B (en) * | 2022-06-01 | 2023-05-23 | 西南石油大学 | Recoverable pressure relief device and method for releasing annular entrapment pressure of casing |
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| CN201778759U (en) * | 2010-08-23 | 2011-03-30 | 李玉福 | Underground tubing-casing annulus pressure-reducing device |
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| CN201778759U (en) * | 2010-08-23 | 2011-03-30 | 李玉福 | Underground tubing-casing annulus pressure-reducing device |
| CN203961906U (en) * | 2014-06-17 | 2014-11-26 | 延长油田股份有限公司川口采油厂 | A kind of oil jacket valve of automatic pressure regulation balance |
| CN105840184A (en) * | 2016-06-14 | 2016-08-10 | 西安石油大学 | Annular space pressure monitoring and control device and method for deep sea seafloor wellhead |
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