CN114961643B - Recoverable pressure relief device and method for releasing annular entrapment pressure of casing - Google Patents
Recoverable pressure relief device and method for releasing annular entrapment pressure of casing Download PDFInfo
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- CN114961643B CN114961643B CN202210629564.6A CN202210629564A CN114961643B CN 114961643 B CN114961643 B CN 114961643B CN 202210629564 A CN202210629564 A CN 202210629564A CN 114961643 B CN114961643 B CN 114961643B
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- fluid channel
- guide sleeve
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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
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a recoverable pressure relief device and a recoverable pressure relief method for releasing annular entrapment pressure of a casing, wherein the device comprises a shell and at least one group of pressure relief components arranged on the shell, the shell comprises a first cylinder section, a second cylinder section and a third cylinder section which are sequentially connected and coaxially arranged, the inner diameters of the first cylinder section and the third cylinder section are smaller than the inner diameter of the second cylinder section, and the first cylinder section and the third cylinder section are respectively in threaded connection with two casings in a deep water oil-gas well casing so as to enable the shell to be communicated with the inside of the deep water oil-gas well casing; the pressure relief assembly can be communicated with the inside of the annular trap and the deep water oil and gas well sleeve, so that annular trap pressure is transferred to the inside of the deep water oil and gas well sleeve to realize pressure relief, and the pressure relief assembly can be reset after pressure relief, so that recoverable pressure relief is realized. The invention can repeatedly control the annular trapping pressure of the sleeve of the deep water oil-gas well, ensure the safety of a shaft in the well completion exploitation process and effectively reduce the waste of manpower and material resources.
Description
Technical Field
The invention relates to the technical field of deep water oil and gas field development, in particular to a recoverable pressure relief device and method for releasing annular entrapment pressure of a casing.
Background
The deep water region is an important successor of global oil and gas resources, and more than 70% of global oil and gas resources are contained in the ocean, wherein 40% of the oil and gas resources come from the deep water region. However, the deep water oil and gas resource has complex geological structure, and the oil and gas resource exploration and development process generally faces a plurality of problems of high temperature, high pressure, low cracking pressure, narrow safety density window and the like, so that the well cementation cement paste cannot return to the wellhead, and a closed annulus is formed in the well section below the mud line. In the well completion, test and production process, high-temperature fluid flowing to a well head from the bottom of the well flows through a pipe column and annular fluid in the radial direction, the closed annular fluid is heated and expanded, so that annular trapping pressure rises, the deepwater underwater well head cannot implement pressure relief operation, and if the trapping pressure exceeds the yield strength of a sleeve, the integrity of the well shaft is damaged, and the testing and production safety of the deepwater oil-gas well are greatly threatened. At present, the annular space trapping pressure is released by mainly adopting a technology of installing a rupture disc and a sacrificial sleeve in engineering, but the technology is difficult to meet the full life cycle annular space trapping pressure release requirement of a deep water oil-gas well. Therefore, a pressure relief device and a pressure relief method capable of effectively releasing annular trapping pressure and serving the full life cycle development process of a deep water oil-gas well are needed.
Disclosure of Invention
In view of the above, the present invention aims to provide a recoverable pressure relief device and method for releasing annular trapping pressure of a casing.
The technical scheme of the invention is as follows:
in one aspect, a recoverable pressure relief device for releasing annular entrapment pressure of a casing is provided, the recoverable pressure relief device comprises a casing and at least one group of pressure relief components arranged on the casing, the casing comprises a first cylinder section, a second cylinder section and a third cylinder section which are sequentially connected and coaxially arranged, the inner diameters of the first cylinder section and the third cylinder section are smaller than the inner diameter of the second cylinder section, and the first cylinder section and the third cylinder section are respectively in threaded connection with two casings in a deep water oil-gas well casing so that the casing is communicated with the inside of the deep water oil-gas well casing; the pressure relief assembly can be communicated with the annular trap and the inside of the deepwater casing, so that the pressure of the annular trap is transferred to the inside of the deepwater oil-gas well casing to realize pressure relief, and the pressure relief assembly can be reset after pressure relief, so that recoverable pressure relief is realized.
Preferably, the pressure relief assembly comprises a tool main body axially arranged along the outer surface of the shell, wherein a first main fluid channel, a second main fluid channel, a third main fluid channel and a fourth main fluid channel are arranged in the tool main body, a pressure relief control mechanism is arranged in the first main fluid channel, a first piston is arranged in the second main fluid channel, a second piston is arranged in the third main fluid channel, a first pressure relief hole and a second pressure relief hole are arranged on the tool main body, the pressure relief hole is communicated with the annular closure and the first main fluid channel, and the second pressure relief hole penetrates through the second cylinder section to be communicated with the inside of the deep water oil-gas well sleeve and the fourth main fluid channel;
the first main fluid channel longitudinally penetrates through the tool main body, a first plug is arranged at the top of the first main fluid channel, and a second plug is arranged at the bottom of the first main fluid channel;
the second main fluid channel is arranged at the upper left side of the first main fluid channel in parallel and communicated with the first main fluid channel through a first connecting channel, and the first connecting channel is positioned at the lower part of the first piston;
the main fluid channel III is arranged at the lower right side of the main fluid channel I in parallel and is communicated with the main fluid channel I through a connecting channel II, the connecting channel II is positioned at the upper part of the piston II, and a plug III is arranged at the bottom of the main fluid channel III;
the third connecting channel is positioned at the lower part of the second piston, the upper part of the fourth main fluid channel is communicated with the first main fluid channel through the fourth connecting channel, the fourth connecting channel and the first pressure relief hole are positioned on the same horizontal plane, and a fourth plug is arranged at the bottom of the fourth main fluid channel;
the pressure relief control mechanism comprises a rotary rod and a piston III, wherein the rotary rod comprises a first cylindrical section, a second cylindrical section and a third cylindrical section which are sequentially connected from top to bottom and sequentially reduced in outer diameter, the outer diameter of the first cylindrical section is matched with the inner diameter of the first main fluid channel, a guide sleeve is sleeved on the outer surface of the first cylindrical section, the length of the guide sleeve is smaller than that of the second cylindrical section, a guide groove encircling the guide sleeve is formed in the middle of the guide sleeve, the guide groove enables the guide sleeve to be separated into an upper guide sleeve and a lower guide sleeve, the upper guide sleeve and the lower guide sleeve are connected through a limiting support rod arranged on the outer surface of the guide sleeve, the lower surface of the upper guide sleeve comprises a vertical surface and a curved surface which are connected end to end, the upper surface of the lower guide sleeve comprises a first upper surface and a second upper surface which are connected end to end, the first upper surface is a curved surface or an inclined surface which is inclined downwards, and the starting end of the first upper surface is opposite to the vertical surface of the upper guide sleeve; the second cylindrical section is provided with a through hole which radially penetrates through the second cylindrical section, a guide rod is arranged in the through hole, the length of the guide rod is larger than the outer diameter of the second cylindrical section and smaller than or equal to the outer diameter of the guide sleeve, and one end of the guide rod protruding out of the second cylindrical section is positioned in the guide groove;
an arc pressure release cavity is arranged on the second cylindrical section below the guide sleeve, the radian of the arc pressure release cavity is larger than the included angle between the first pressure release hole and the fourth connecting channel, so that the first pressure release hole and the fourth connecting channel can be communicated after the rotary rod rotates, and annular entrapment is realized to release pressure to the interior of the deepwater sleeve;
the disc spring group is sleeved on the outer surface of the cylindrical section III, the piston III is abutted with the disc spring group, and a limiting groove for accommodating the cylindrical section III is formed in the top of the piston III;
the horizontal plane that rotary rod top was located is lower than the horizontal plane that connecting channel one was located, the horizontal plane that piston three bottom was located is higher than the horizontal plane that connecting channel two was located, just connecting channel one main fluid channel one and in the main fluid channel two of intercommunication, and connecting channel two main fluid channel one and in the main fluid channel three of intercommunication all are equipped with hydraulic oil.
Preferably, the second upper surface of the lower guide sleeve comprises a first vertical surface, a horizontal surface, a second vertical surface and a curved surface which are connected end to end in sequence, and the initial end of the first vertical surface is connected with the lower end of the first upper surface.
Preferably, the first upper surface is a concave surface, the horizontal plane of the left end of the concave surface is lower than the horizontal plane of the right end of the concave surface, the left end of the concave surface is connected with the initial end of the second upper surface, and the right end of the concave surface is connected with the tail end of the second upper surface.
Preferably, the bottom of the second vertical plane is connected to the top of the horizontal plane.
Preferably, the curved surface of the second upper surface is an inclined surface.
Preferably, the first piston, the second piston, the third piston and the first cylindrical section are provided with at least one annular groove, the second cylindrical sections at the upper end and the lower end of the arc pressure release cavity are respectively provided with at least one annular groove, and sealing rings are arranged in the annular grooves.
Preferably, the pressure relief assembly is provided in plurality, and the pressure relief assemblies are uniformly distributed on the shell.
On the other hand, the recoverable pressure relief method for releasing the annular entrapment pressure of the casing is also provided, and the recoverable pressure relief device for releasing the annular entrapment pressure of the casing is adopted for pressure relief;
fluid in the annular trap enters the main fluid channel II from the top of the main fluid channel II, and fluid in the deep water oil and gas well casing enters the main fluid channel IV and the connecting channel IV through the pressure relief hole II and enters the main fluid channel III through the connecting channel III;
in an initial state, the rotary rod plugs the pressure relief hole I and/or the connecting channel IV;
when the pressure of fluid in the annular trap is greater than that of fluid in the deepwater casing pipe and the pressure difference is greater than a pressure release threshold, a piston in the main fluid channel II moves downwards, the pressure is transmitted through hydraulic oil in the main fluid channel II and the main fluid channel I, so that the rotating rod moves downwards, the guide sleeve is fixed, the guide rod moves downwards along the vertical plane, and then rotates along the curved surface to recover; in the rotating process of the guide rod, the rotating rod is driven to rotate, the arc pressure release cavity is communicated with the first pressure release hole and the fourth connecting channel, the annular space trapped pressure is transmitted to the inside of the deepwater sleeve, and pressure release is achieved.
Preferably, when the pressure difference P is greater than F, the rotating rod starts to rotate, where f=kx, where k is the compression coefficient of the disc spring set, and x is the length of the vertical plane.
The beneficial effects of the invention are as follows:
according to the invention, the annular trap and the deep water sleeve are communicated through the pressure relief assembly, and the pressure relief is carried out through the pressure difference between the annular trap and the deep water sleeve, so that the annular trap pressure of the deep water oil-gas well sleeve is controlled, the sleeve can be reused, the safety of a shaft in the well completion and exploitation processes is ensured, and the waste of manpower and material resources is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic perspective view of a recoverable pressure relief device for relieving annular entrapment pressure in a casing according to the present invention;
FIG. 2 is a schematic diagram of the front view of the housing of the recoverable pressure relief device of the present invention releasing casing annulus trap pressure;
FIG. 3 is a schematic side view of a housing of the recoverable pressure relief device of the present invention releasing casing annulus trap pressure;
FIG. 4 is a schematic diagram of a front view of a recoverable pressure relief device of the present invention that releases casing annulus trap pressure;
FIG. 5 is a schematic diagram of a pressure relief control mechanism of a recoverable pressure relief device of the present invention that releases casing annulus trap pressure;
FIG. 6 is a schematic diagram of a front view of a rotary rod of a recoverable pressure relief device of the present invention releasing casing annulus trap pressure;
FIG. 7 is a schematic perspective view of a guide sleeve on a recoverable pressure relief device of the present invention releasing casing annulus trap pressure;
FIG. 8 is a schematic perspective view of a lower guide sleeve of the recoverable pressure relief device of the present invention releasing casing annulus trap pressure;
FIG. 9 is a schematic perspective view of a recoverable pressure relief device sleeve releasing sleeve annulus trap pressure according to the present invention;
FIG. 10 is a schematic illustration of the pressure relief device of the present invention releasing the annular entrapment pressure during fluid ingress;
fig. 11 is a schematic diagram of a recoverable pressure relief device for releasing annular entrapment pressure according to the present invention.
Reference numerals in the drawings: 1-shell, 101-first cylinder section, 102-second cylinder section, 103-third cylinder section, 104-fourth cylinder section, 105-fifth cylinder section, 2-relief assembly, 3-tool body, 301-main fluid passage one, 302-main fluid passage two, 303-main fluid passage three, 304-main fluid passage four, 305-plug one, 306-plug two, 307-connection passage one, 308-connection passage two, 309-plug three, 310-connection passage three, 311-connection passage four, 312-plug four, 4-relief control mechanism, 5-piston one, 6-piston two, 7-relief hole one, 8-relief hole two, 9-rotary rod, 901-cylinder section one, 902-cylinder section two, 903-cylinder section three, 904-through hole, 905-guide rod, 906-arc-shaped relief cavity, 903-disc spring set, 10-piston three, 11-guide sleeve, 1101-upper guide sleeve, 1102-lower guide sleeve, 1103-limit support rod, 12-guide groove, 13-limit groove, 14-limit groove, and fixed limit groove.
Detailed Description
The invention will be further described with reference to the drawings and examples. It should be noted that, without conflict, the embodiments and technical features of the embodiments in the present application may be combined with each other. It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated. The use of the terms "comprising" or "includes" and the like in this disclosure is intended to cover a member or article listed after that term and equivalents thereof without precluding other members or articles.
In one aspect, as shown in fig. 1, the present invention provides a recoverable pressure relief device for releasing annular trapping pressure of a casing, which comprises a casing 1 and at least one group of pressure relief assemblies 2 arranged on the casing 1, wherein the casing 1 comprises a first cylinder section 101, a second cylinder section 102 and a third cylinder section 103 which are sequentially connected and coaxially arranged, the inner diameters of the first cylinder section 101 and the third cylinder section 103 are smaller than the inner diameter of the second cylinder section 102, and the first cylinder section 101 and the third cylinder section 103 are respectively in threaded connection with two casings in a deepwater oil-gas well casing so as to enable the casing 1 to be communicated with the interior of the deepwater oil-gas well casing; the pressure relief assembly 2 can be communicated with the inside of the annular trap and the deep water casing, so that the pressure of the annular trap is transferred to the inside of the deep water oil-gas well casing to realize pressure relief, and the pressure relief assembly 2 can be reset after pressure relief to realize recoverable pressure relief.
In a specific embodiment, the housing 1 further includes a fourth cylinder section 104 and a fifth cylinder section 105 having the same diameter as the second cylinder section 102, wherein the bottom of the fourth cylinder section 104 is connected to the top of the first cylinder section 101, and the top of the fifth cylinder section 105 is connected to the bottom of the third cylinder section 103.
In a specific embodiment, the pressure relief assembly 2 includes a tool main body 3 axially disposed along an outer surface of the casing 1, a first main fluid channel 301, a second main fluid channel 302, a third main fluid channel 303, and a fourth main fluid channel 304 are disposed in the tool main body 3, a pressure relief control mechanism 4 is disposed in the first main fluid channel 301, a first piston 5 is disposed in the second main fluid channel 302, a second piston 6 is disposed in the third main fluid channel 303, a first pressure relief hole 7 and a second pressure relief hole 8 are disposed on the tool main body 3, the first pressure relief hole 7 communicates with the first main fluid channel 301 through an annular space, and the second pressure relief hole 8 penetrates through the second cylinder section 102 to communicate the interior of the deep water oil-gas well casing with the fourth main fluid channel 304;
the first main fluid channel 301 longitudinally penetrates through the tool main body 3, a first plug 305 is arranged at the top of the first main fluid channel 301, and a second plug 306 is arranged at the bottom of the first main fluid channel 301;
the main fluid channel two 302 is arranged in parallel at the upper left side of the main fluid channel one 301 and is communicated with the main fluid channel one 301 through a connecting channel one 307, and the connecting channel one 307 is positioned at the lower part of the piston one 5;
the third main fluid channel 303 is arranged in parallel at the lower right side of the first main fluid channel 301, and is communicated with the first main fluid channel 301 through the second connecting channel 308, the second connecting channel 308 is positioned at the upper part of the second piston 6, and the bottom of the third main fluid channel 303 is provided with a third plug 309;
the third main fluid channel 304 is arranged in parallel on the right side of the third main fluid channel 303, the lower part of the fourth main fluid channel 304 is communicated with the third main fluid channel 303 through a third connecting channel 310, the third connecting channel 310 is positioned at the lower part of the second piston 6, the upper part of the fourth main fluid channel 304 is communicated with the first main fluid channel 301 through a fourth connecting channel 311, the fourth connecting channel 311 and the first pressure relief hole 7 are positioned on the same horizontal plane, and a fourth plug 312 is arranged at the bottom of the fourth main fluid channel 304;
the pressure release control mechanism 4 comprises a rotary rod 9 and a piston III 10, the rotary rod 9 comprises a first cylindrical section 901, a second cylindrical section 902 and a third cylindrical section 903 which are sequentially connected from top to bottom and sequentially reduced in outer diameter, the outer diameter of the first cylindrical section 901 is matched with the inner diameter of the first main fluid channel 301, a guide sleeve 11 is sleeved on the outer surface of the second cylindrical section 902, the length of the guide sleeve 11 is smaller than that of the second cylindrical section 902, a guide groove 12 surrounding the guide sleeve 11 is formed in the middle of the guide sleeve 11, the guide groove 12 enables the guide sleeve 11 to be separated into an upper guide sleeve 1101 and a lower guide sleeve 1102, the upper guide sleeve 1101 is connected with the lower guide sleeve 1102 through a limit support rod 1103 arranged on the outer surface of the guide sleeve 11, the lower surface of the upper guide sleeve 1101 comprises a vertical surface and a curved surface which are connected end to end, the upper surface of the lower guide sleeve 1102 comprises a first upper surface and a second upper surface which are connected end to end, the first upper surface is a curved surface or an inclined surface which is inclined downwards, and the initial end of the first upper surface is opposite to the guide sleeve 1101; the second cylindrical section 902 is provided with a through hole 904 penetrating through the second cylindrical section in the radial direction, a guide rod 905 is arranged in the through hole 904, the length of the guide rod 905 is greater than the outer diameter of the second cylindrical section 902 and less than or equal to the outer diameter of the guide sleeve 11, and one end of the guide rod 905 protruding out of the second cylindrical section 902 is positioned in the guide groove 12;
an arc-shaped pressure release cavity 906 is arranged on the second cylindrical section 902 below the guide sleeve 11, the radian of the arc-shaped pressure release cavity 906 is larger than the included angle between the first pressure release hole 7 and the fourth connecting channel 311, so that the first pressure release hole 7 and the fourth connecting channel 311 can be communicated after the rotary rod 9 rotates, and annular entrapment is realized to release pressure to the interior of the deepwater sleeve;
the outer surface of the cylindrical section III 903 is sleeved with a disc spring group 907, the piston III 10 is abutted with the disc spring group 907, and the top of the piston III 10 is provided with a limiting groove 13 for accommodating the cylindrical section III 903;
the horizontal plane of the top of the rotating rod 9 is lower than the horizontal plane of the first connecting channel 307, the horizontal plane of the bottom of the third piston 10 is higher than the horizontal plane of the second connecting channel 308, hydraulic oil is arranged in the first main fluid channel 301 and the second main fluid channel 302 which are communicated with the first connecting channel 307, and hydraulic oil is arranged in the first main fluid channel 301 and the third main fluid channel 303 which are communicated with the second connecting channel 308.
In the above embodiment, when the difference between the annular trapped pressure and the pressure of the fluid in the deepwater casing does not exceed the pressure release threshold, the guide rod 905 is not moved or only moves downwards at the vertical surface under the action of the pressure difference, the displacement does not exceed the length of the vertical surface, and the whole rotating rod 9 does not rotate; when the difference between the annular trapping pressure and the pressure of the fluid in the deepwater casing exceeds the pressure release threshold, under the condition that the guide sleeve 11 is fixed, the guide rod 905 moves out of the vertical plane of the upper guide sleeve 1101 and reaches the first upper surface of the lower guide sleeve 1102, and the first upper surface is obliquely arranged, so that the guide rod 905 starts to rotate along the first upper surface of the lower guide sleeve 1102, thereby driving the whole rotating rod 9 to rotate, and in the rotating process, the arc-shaped pressure release cavity 906 is communicated with the pressure release hole I7 and the connecting channel IV 311, thereby communicating the annular trapping with the interior of the deepwater casing, and transmitting the annular trapping pressure to the interior of the deepwater casing, so that pressure release is realized; after the pressure relief, because the curved surface of the upper guide sleeve 1101 is connected with the upper end and the lower end of the vertical surface of the upper guide sleeve 1101, the guide rod 905 starts to rotate along the curved surface and returns to the original position at the included angle between the vertical surface and the curved surface, so that the rotary rod 9 is rotated and restored to the original state before the pressure relief, and the restorable pressure relief is realized.
In a specific embodiment, a limiting fixing groove 14 is formed in the first main fluid channel, and the guiding sleeve 11 is limited and fixed in the limiting fixing groove 14. Optionally, when the upper and lower guide sleeves of the guide sleeve 11 are respectively composed of multiple arc-shaped lobes, the limiting fixing grooves 14 are correspondingly designed into sub limiting fixing grooves with corresponding lobe numbers.
In a specific embodiment, the second upper surface of the lower guide sleeve 1102 includes a first vertical surface, a horizontal surface, a second vertical surface, and a curved surface that are sequentially connected end to end, where a starting end of the first vertical surface is connected to a lower end of the first upper surface.
Optionally, the first upper surface is a concave surface, a horizontal plane where a left end of the concave surface is located is lower than a horizontal plane where a right end of the concave surface is located, the left end of the concave surface is connected with a starting end of the second upper surface, and the right end of the concave surface is connected with a tail end of the second upper surface.
Optionally, the bottom of the second vertical surface is connected with the top of the horizontal surface, and the curved surface of the second upper surface is an inclined surface.
In the above embodiment, the structure of the second upper surface can make the space of the guide groove 12 more convenient for the guide bar 905 to rotate, so as to avoid the guide bar 905 from being jammed.
In order to improve the sealing performance of each component, at least one annular groove is formed in the first piston 5, the second piston 6, the third piston 10 and the first cylindrical section 901, at least one annular groove is formed in the second cylindrical section 902 at the upper end and the lower end of the arc-shaped pressure release cavity 906 respectively, and sealing rings are arranged in the annular grooves.
In a specific embodiment, a plurality of pressure relief assemblies 2 are provided, and the plurality of pressure relief assemblies 2 are uniformly distributed on the housing 1. Optionally, three pressure relief assemblies are provided.
In a specific embodiment, a plug may be disposed at the top of the second main fluid channel 302, and then a fluid inlet is disposed on the plug and communicates with the interior of the second main fluid channel 302.
On the other hand, the invention also provides a recoverable pressure relief method for releasing the annular entrapment pressure of the casing, and the recoverable pressure relief device for releasing the annular entrapment pressure of the casing is used for relieving pressure;
fluid in the annular trap enters the main fluid channel II 302 from the top of the main fluid channel II 302, fluid in the deep water oil and gas well casing enters the main fluid channel IV 304 and the connecting channel IV 311 through the pressure relief hole II 8, and enters the main fluid channel III 303 through the connecting channel III 310;
in the initial state, the rotating rod 9 seals the pressure relief hole one 7 and/or the connecting channel four 311;
when the pressure of the fluid in the annular trap is greater than the pressure of the fluid in the deepwater casing and the pressure difference is greater than the pressure release threshold, the piston in the main fluid channel II 302 moves downwards, the rotating rod 9 moves downwards through the pressure transmission of hydraulic oil in the main fluid channel II 302 and the main fluid channel I301, the guide sleeve 11 is fixed, the guide rod 905 moves downwards along the vertical plane and then rotates along the curved plane to recover; in the process of rotating the guide rod 905, the rotating rod is driven to rotate, so that the arc pressure release cavity 906 is communicated with the pressure release hole I7 and the connecting channel IV 311, the annular trapping pressure is transmitted to the inside of the deepwater sleeve, and pressure release is realized.
When the recoverable pressure relief device for releasing annular entrapment pressure of the sleeve is used for pressure relief, when the pressure difference P is larger than F, the rotating rod starts to rotate, F=kx, wherein k is the compression coefficient of the disc spring set, and x is the length of the vertical plane. The pressure relief device with different pressure difference thresholds can be obtained by adjusting the length of the vertical plane, the number of the disc springs of the disc spring group and the like.
In summary, the pressure difference between the inside and the outside of the sleeve is used as the power of the pressure relief assembly, so that the pressure relief assembly is relieved through the pressure difference, and compared with the prior art, the pressure relief assembly has obvious progress.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (9)
1. The recoverable pressure relief device for releasing annular trapping pressure of the casing is characterized by comprising a shell and at least one group of pressure relief assemblies arranged on the shell, wherein the shell comprises a first cylinder section, a second cylinder section and a third cylinder section which are sequentially connected and coaxially arranged, the inner diameters of the first cylinder section and the third cylinder section are smaller than the inner diameter of the second cylinder section, and the first cylinder section and the third cylinder section are respectively in threaded connection with two casings in the deepwater oil-gas well casing so as to enable the shell to be communicated with the inside of the deepwater oil-gas well casing; the pressure relief assembly can be communicated with the annular trap and the interior of the deepwater casing, so that the pressure of the annular trap is transmitted to the interior of the deepwater oil-gas well casing to realize pressure relief, and the pressure relief assembly can be reset after pressure relief to realize recoverable pressure relief;
the pressure relief assembly comprises a tool main body axially arranged along the outer surface of the shell, a main fluid channel I, a main fluid channel II, a main fluid channel III and a main fluid channel IV are arranged in the tool main body, a pressure relief control mechanism is arranged in the main fluid channel I, a piston I is arranged in the main fluid channel II, a piston II is arranged in the main fluid channel III, a pressure relief hole I and a pressure relief hole II are arranged on the tool main body, the pressure relief hole is communicated with an annular trap and the main fluid channel I, and the pressure relief hole II penetrates through the second cylinder section to be communicated with the inside of the deep water oil-gas well sleeve and the main fluid channel IV;
the first main fluid channel longitudinally penetrates through the tool main body, a first plug is arranged at the top of the first main fluid channel, and a second plug is arranged at the bottom of the first main fluid channel;
the second main fluid channel is arranged at the upper left side of the first main fluid channel in parallel and communicated with the first main fluid channel through a first connecting channel, and the first connecting channel is positioned at the lower part of the first piston;
the main fluid channel III is arranged at the lower right side of the main fluid channel I in parallel and is communicated with the main fluid channel I through a connecting channel II, the connecting channel II is positioned at the upper part of the piston II, and a plug III is arranged at the bottom of the main fluid channel III;
the third connecting channel is positioned at the lower part of the second piston, the upper part of the fourth main fluid channel is communicated with the first main fluid channel through the fourth connecting channel, the fourth connecting channel and the first pressure relief hole are positioned on the same horizontal plane, and a fourth plug is arranged at the bottom of the fourth main fluid channel;
the pressure relief control mechanism comprises a rotary rod and a piston III, wherein the rotary rod comprises a first cylindrical section, a second cylindrical section and a third cylindrical section which are sequentially connected from top to bottom and sequentially reduced in outer diameter, the outer diameter of the first cylindrical section is matched with the inner diameter of the first main fluid channel, a guide sleeve is sleeved on the outer surface of the first cylindrical section, the length of the guide sleeve is smaller than that of the second cylindrical section, a guide groove encircling the guide sleeve is formed in the middle of the guide sleeve, the guide groove enables the guide sleeve to be separated into an upper guide sleeve and a lower guide sleeve, the upper guide sleeve and the lower guide sleeve are connected through a limiting support rod arranged on the outer surface of the guide sleeve, the lower surface of the upper guide sleeve comprises a vertical surface and a curved surface which are connected end to end, the upper surface of the lower guide sleeve comprises a first upper surface and a second upper surface which are connected end to end, the first upper surface is a curved surface or an inclined surface which is inclined downwards, and the starting end of the first upper surface is opposite to the vertical surface of the upper guide sleeve; the second cylindrical section is provided with a through hole which radially penetrates through the second cylindrical section, a guide rod is arranged in the through hole, the length of the guide rod is larger than the outer diameter of the second cylindrical section and smaller than or equal to the outer diameter of the guide sleeve, and one end of the guide rod protruding out of the second cylindrical section is positioned in the guide groove;
an arc pressure release cavity is arranged on the second cylindrical section below the guide sleeve, the radian of the arc pressure release cavity is larger than the included angle between the first pressure release hole and the fourth connecting channel, so that the first pressure release hole and the fourth connecting channel can be communicated after the rotary rod rotates, and annular entrapment is realized to release pressure to the interior of the deepwater sleeve;
the disc spring group is sleeved on the outer surface of the cylindrical section III, the piston III is abutted with the disc spring group, and a limiting groove for accommodating the cylindrical section III is formed in the top of the piston III;
the horizontal plane that rotary rod top was located is lower than the horizontal plane that connecting channel one was located, the horizontal plane that piston three bottom was located is higher than the horizontal plane that connecting channel two was located, just connecting channel one main fluid channel one and in the main fluid channel two of intercommunication, and connecting channel two main fluid channel one and in the main fluid channel three of intercommunication all are equipped with hydraulic oil.
2. The recoverable pressure relief device of claim 1, wherein the second upper surface of the lower guide sleeve comprises a first vertical surface, a horizontal surface, a second vertical surface, and a curved surface connected end to end in sequence, wherein a beginning end of the first vertical surface is connected to a lower end of the first upper surface.
3. The recoverable pressure relief device of claim 2, wherein the first upper surface is a concave surface and the left end of the concave surface is at a lower level than the right end of the concave surface, the left end of the concave surface is connected to the beginning of the second upper surface, and the right end of the concave surface is connected to the end of the second upper surface.
4. A recoverable pressure relief device for relieving casing annulus trap pressure according to claim 3, wherein the bottom of said second vertical surface is connected to the top of said horizontal surface.
5. The recoverable pressure relief device for releasing annular entrapment pressure of a casing of claim 4 wherein the curved surface of the second upper surface is an inclined surface.
6. The recoverable pressure relief device for releasing annular entrapment pressure of a casing according to claim 1, wherein at least one annular groove is formed in the first piston, the second piston, the third piston and the first cylindrical section, at least one annular groove is formed in the second cylindrical section at the upper end and the lower end of the arc-shaped pressure relief cavity respectively, and a sealing ring is arranged in the annular groove.
7. The recoverable pressure relief device for relieving casing annulus trap pressure according to any one of claims 1-6, wherein a plurality of said pressure relief assemblies are provided and a plurality of said pressure relief assemblies are evenly distributed on said housing.
8. A recoverable pressure relief method for releasing annular entrapment pressure of a casing, characterized in that the recoverable pressure relief device for releasing annular entrapment pressure of a casing according to any one of claims 1 to 7 is used for pressure relief;
fluid in the annular trap enters the main fluid channel II from the top of the main fluid channel II, and fluid in the deep water oil and gas well casing enters the main fluid channel IV and the connecting channel IV through the pressure relief hole II and enters the main fluid channel III through the connecting channel III;
in an initial state, the rotary rod plugs the pressure relief hole I and/or the connecting channel IV;
when the pressure of fluid in the annular trap is greater than that of fluid in the deepwater casing pipe and the pressure difference is greater than a pressure release threshold, a piston in the main fluid channel II moves downwards, the pressure is transmitted through hydraulic oil in the main fluid channel II and the main fluid channel I, so that the rotating rod moves downwards, the guide sleeve is fixed, the guide rod moves downwards along the vertical plane, and then rotates along the curved surface to recover; in the rotating process of the guide rod, the rotating rod is driven to rotate, the arc pressure release cavity is communicated with the first pressure release hole and the fourth connecting channel, the annular space trapped pressure is transmitted to the inside of the deepwater sleeve, and pressure release is achieved.
9. The recoverable pressure relief method for a released casing annulus trap pressure of claim 8, wherein when the pressure differential P is greater than F, the rotary lever begins to rotate, F = kx, where k is the compression factor of the disc spring set and x is the length of the vertical plane.
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| CN202210629564.6A CN114961643B (en) | 2022-06-01 | 2022-06-01 | Recoverable pressure relief device and method for releasing annular entrapment pressure of casing |
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| CN202210629564.6A CN114961643B (en) | 2022-06-01 | 2022-06-01 | Recoverable pressure relief device and method for releasing annular entrapment pressure of casing |
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| CN106761554A (en) * | 2016-12-20 | 2017-05-31 | 中国石油天然气股份有限公司 | The pressure relief device in deep water hydrocarbon casing trap space |
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| CN114961643A (en) | 2022-08-30 |
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