CN114961645B - Multi-activation bidirectional pressure relief device and method for releasing annular trapping pressure of sleeve - Google Patents
Multi-activation bidirectional pressure relief device and method for releasing annular trapping pressure of sleeve Download PDFInfo
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- CN114961645B CN114961645B CN202210562214.2A CN202210562214A CN114961645B CN 114961645 B CN114961645 B CN 114961645B CN 202210562214 A CN202210562214 A CN 202210562214A CN 114961645 B CN114961645 B CN 114961645B
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims description 224
- 238000007906 compression Methods 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 24
- 230000006835 compression Effects 0.000 claims description 22
- 239000010720 hydraulic oil Substances 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 230000004913 activation Effects 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- 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
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- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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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
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a multi-activation bidirectional pressure relief device and a method for releasing annular trap pressure of a casing, wherein the device comprises a casing and at least one group of pressure relief components arranged on the casing, the casing comprises a first cylindrical section, a second cylindrical section and a third cylindrical section which are sequentially connected and coaxially arranged, the inner diameters of the first cylindrical section and the third cylindrical section are smaller than that of the second cylindrical section, the first cylindrical section and the third cylindrical section are respectively in threaded connection with two casings in a deep water casing, so that the casing is communicated with the interior of the deep water casing, and the pressure relief components can be communicated with the annular trap and the interior of the deep water casing and perform pressure relief through pressure difference between the annular trap and the interior of the deep water casing. The invention can control the annular confining pressure of the casing of the deepwater oil-gas well, can be repeatedly used, ensures the safety of the shaft in the well completion and exploitation processes, and effectively reduces the waste of manpower and material resources.
Description
Technical Field
The invention relates to the technical field of deepwater oil and gas field development, in particular to a multi-activation bidirectional pressure relief device and method for releasing annular confining pressure of a casing.
Background
Deepwater zones are important successor areas of global oil and gas resources, and over 70% of the global oil and gas resources are contained in oceans, of which 40% come from deepwater zones. However, deepwater oil and gas resources have complex geological structures, and the exploration and development process of the oil and gas resources generally faces a plurality of problems of high temperature, high pressure, low fracture pressure, narrow safety density window and the like, so that well cementation cement slurry cannot return to a wellhead generally, and a closed annulus is formed in a well section below a mud line. In the process of well completion, test and production, high-temperature fluid flowing from a well bottom to a well head conducts heat in the radial direction through a pipe column and annular fluid, the closed annular fluid is heated and expanded, the annular confining pressure is increased, the deepwater underwater well head cannot implement pressure relief operation, if the confining pressure exceeds the yield strength of a sleeve, the integrity of a shaft is damaged, and the safety of test and production of the deepwater oil and gas well is greatly threatened. At present, the technology of installing a rupture disc and sacrificing a casing pipe is mainly adopted in engineering to release annular confining pressure, but the technology is difficult to meet the requirement of releasing the annular confining pressure in the whole life cycle of a deepwater oil-gas well. Therefore, a pressure relief device and a method capable of effectively releasing annular confining pressure and serving in the full life cycle development process of a deepwater oil and gas well are needed.
Disclosure of Invention
In view of the above problems, the present invention provides a multi-activation bidirectional pressure relief device and method for releasing the annulus trapping pressure of a casing.
The technical scheme of the invention is as follows:
in one aspect, a multi-activation bidirectional pressure relief device for releasing the annular confining pressure of a casing is provided, which comprises a casing and at least one group of pressure relief components arranged on the casing, wherein 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 that of the second cylinder section, and the first cylinder section and the third cylinder section are respectively in threaded connection with two casing pipes in a deep water casing pipe, so that the casing is communicated with the interior of the deep water casing pipe; the pressure relief assembly can be communicated with the interior of the annular trap and the interior of the deepwater casing pipe and is used for relieving pressure through pressure difference between the annular trap and the interior of the deepwater casing pipe.
Preferably, the pressure relief assembly comprises a protrusion arranged along the axial direction of the outer surface of the shell, a first main fluid channel, a second main fluid channel, a third main fluid channel, a fourth main fluid channel and a fifth main fluid channel are arranged in the protrusion, a first pressure relief control mechanism is arranged in the first main fluid channel, a second pressure relief control mechanism is arranged in the fourth main fluid channel, a hydraulic oil injection hole communicated with the first main fluid channel and a pressure relief hole communicated with the fourth main fluid channel are arranged on the protrusion, and a hydraulic oil injection hole plug is arranged at the inlet of the hydraulic oil injection hole;
the first main fluid channel longitudinally penetrates through the bulge, the top of the first main fluid channel is communicated with the annular ring of the deep water sleeve, and the bottom of the first main fluid channel is provided with a first plug;
the main fluid channel II is arranged on the upper portion of the left side of the main fluid channel I in parallel and is communicated with the main fluid channel I through a connecting channel I, a connecting channel II and a connecting channel III which are arranged in parallel from top to bottom, and the top of the main fluid channel II is provided with a plug II;
the main fluid channel III is arranged on the lower portion of the left side of the main fluid channel I in parallel and is communicated with the main fluid channel I through a connecting channel IV and a connecting channel V which are arranged in parallel from top to bottom, and a plug III is arranged at the bottom of the main fluid channel III;
the fourth main fluid channel longitudinally penetrates through the bulge and is arranged on the right side of the first main fluid channel in parallel, the fourth main fluid channel is communicated with the first main fluid channel through a sixth connecting channel and a seventh connecting channel which are arranged in parallel from top to bottom, the top of the fourth main fluid channel is provided with a fourth plug, and the bottom of the fourth main fluid channel is provided with a fifth plug;
the main fluid channel five is arranged on the rear side of the main fluid channel I in parallel, is communicated with the main fluid channel I through a connecting channel eight, is communicated with the main fluid channel four through a connecting channel nine, and is communicated with the interior of the deep water sleeve through a connecting channel ten, the connecting channel ten is arranged between the main fluid channel five and the second cylinder section, and the bottom of the main fluid channel five is provided with a plug six;
the first pressure relief control mechanism comprises a first disc spring guide rod, a first disc spring group, a first piston, a second piston, a third piston, a second disc spring guide rod, a second disc spring group and a fourth piston which are sequentially arranged from top to bottom, the disc spring group is sleeved on the outer surface of the first disc spring guide rod, and the second disc spring group is sleeved on the outer surface of the second disc spring guide rod;
in an initial state, the level of the top of the disc spring guide rod I is lower than that of the connecting channel I, so that fluid in the main fluid channel I can flow into the main fluid channel II through the connecting channel I; the horizontal plane of the bottom of the piston IV is higher than the horizontal plane of the connecting channel VIII, so that the fluid in the main fluid channel V can flow into the main fluid channel I through the connecting channel VIII;
a first cavity is reserved between the first piston and the second piston, so that fluid in the main fluid channel II can enter the first main fluid channel through the second connecting channel; a second cavity is reserved between the second piston and the third piston and is communicated with the hydraulic oil injection hole for storing hydraulic oil; the middle parts of the third piston and the fourth piston are respectively provided with an annular groove, so that the fluid in the main fluid channel II flows into the main fluid channel IV through the third connecting channel and the sixth connecting channel, and the fluid in the main fluid channel III flows into the main fluid channel IV through the fourth connecting channel and the seventh connecting channel;
the pressure relief control mechanism II comprises a compression assembly I and a compression assembly II, the compression assembly I and the compression assembly II both comprise a disc spring guide rod III and a disc spring group III, and the disc spring group III is sleeved on the outer surface of the disc spring guide rod III; in an initial state, the first compression assembly blocks the pressure relief hole, and the second compression assembly blocks the connecting channel nine.
Preferably, the pressure relief assembly is provided in plurality, and the pressure relief assembly is uniformly distributed on the housing.
Preferably, the outer surfaces of the first piston, the second piston, the third piston and the fourth piston are provided with sealing rings.
Preferably, the first plug, the second plug, the third plug, the fourth plug, the fifth plug and the sixth plug are all fixed through snap springs.
Preferably, the disc spring guide rod II is in threaded connection with the piston III.
On the other hand, a multi-activation bidirectional pressure relief method for releasing the annular trapping pressure of the sleeve is also provided, and the multi-activation bidirectional pressure relief device for releasing the annular trapping pressure of the sleeve is adopted for pressure relief;
fluid in the annular trap enters the first main fluid channel from the top of the first main fluid channel and enters the second main fluid channel through the first connecting channel, and the annular trap fluid in the second main fluid channel enters the first cavity through the second connecting channel;
fluid in the deep water sleeve enters the main fluid channel five through the connecting channel ten and enters the main fluid channel I through the connecting channel eight, and fluid in the deep water sleeve in the main fluid channel I enters the main fluid channel three through the connecting channel five;
when the pressure of fluid in the annular trap is larger than that of fluid in the deep water sleeve and the pressure difference is larger than a pressure relief threshold value one, the pressure relief control mechanism I is compressed downwards integrally, the annular groove in the middle of the piston III is communicated with the connecting channel III and the connecting channel VI, so that the annular trap fluid enters the main fluid channel IV, then the compression assembly II in the main fluid channel IV is compressed downwards, the connecting channel nine is opened, and the annular trap is communicated with the interior of the deep water sleeve through the main fluid channel five and the connecting channel ten, so that pressure is relieved;
when the pressure of fluid in the deep water sleeve is larger than that of fluid in the annular trap and the pressure difference is larger than a pressure relief threshold value II, the pressure relief control mechanism I is compressed upwards as a whole, the annular groove in the middle of the piston IV is communicated with the connecting channel IV and the connecting channel VII, so that the fluid in the deep water sleeve enters the main fluid channel IV and then is compressed upwards to open the pressure relief hole, and the interior of the deep water sleeve is communicated with the annular trap through the pressure relief hole, so that pressure is relieved.
Preferably, the first pressure relief threshold is the same as the second pressure relief threshold.
Preferably, the first pressure relief threshold is greater than the second pressure relief threshold.
Preferably, the first pressure relief threshold is smaller than the second pressure relief threshold.
The invention has the beneficial effects that:
the annular trap and the interior of the deepwater casing can be communicated through the pressure relief assembly, and pressure relief is carried out through the pressure difference between the annular trap and the interior of the deepwater casing, so that the annular trap pressure of the casing of the deepwater oil-gas well can be controlled and can be repeatedly used, the safety of a shaft in the well completion and exploitation processes is guaranteed, and the waste of manpower and material resources is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic perspective view of a multiple activation bi-directional pressure relief device for releasing the pressure of the annulus trap of a casing according to the present invention;
FIG. 2 is a schematic diagram of a front view of a housing of the multiple activation bi-directional pressure relief device for releasing the annulus trapping pressure of the sleeve of the present invention;
FIG. 3 is a schematic side view of a multiple activation bi-directional pressure relief device housing for releasing the annulus trapping pressure of a bushing in accordance with the present invention;
FIG. 4 is a schematic structural view of a pressure release control mechanism of a multi-activation bidirectional pressure release device for releasing the annular closing pressure of a sleeve according to the present invention; wherein (a) is a front view structure schematic diagram of a first pressure relief control mechanism; (b) is a front view structure schematic diagram of a second pressure relief control mechanism; (c) is a front view structure schematic diagram of each disc spring guide rod;
FIG. 5 is a schematic diagram of a state of the multiple-activation bi-directional pressure relief device according to the present invention when fluid enters to release the annulus trapping pressure of the sleeve.
FIG. 6 is a schematic diagram of a state of the multiple-activation bidirectional pressure relief device for releasing the annulus trapping pressure of the casing when the annulus trapping is depressurized into the casing;
FIG. 7 is a schematic view of the state of the multi-activation bi-directional pressure relief device for releasing the annulus trapping pressure of the casing when the inside of the casing releases pressure to the annulus trapping.
Reference numbers in the figures: 1-housing, 101-first cylinder segment, 102-second cylinder segment, 103-third cylinder segment, 104-fourth cylinder segment, 105-fifth cylinder segment, 2-pressure relief assembly, 3-protrusion, 301-primary fluid channel one, 302-primary fluid channel two, 303-primary fluid channel three, 304-primary fluid channel four, 305-primary fluid channel five, 306-plug one, 307-connecting channel one, 308-connecting channel two, 309-connecting channel three, 310-plug two, 311-connecting channel four, 312-connecting channel five, 313-plug three, 314-connecting channel six, 315-connecting channel seven, and 316-plug four, 317-plug five, 318-connecting channel eight, 319-connecting channel nine, 320-connecting channel ten, 321-plug six, 4-pressure relief control mechanism one, 401-disc spring guide rod one, 402-disc spring group one, 403-piston one, 404-piston two, 405-piston three, 406-disc spring guide rod two, 407-disc spring group two, 408-piston four, 409-cavity one, 410-cavity two, 5-pressure relief control mechanism two, 501-compression component one, 502-compression component two, 503-disc spring guide rod three, 504-disc spring group three, 6-hydraulic oil injection hole and 7-pressure relief hole.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict. It is noted that, unless otherwise indicated, 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. The use of the terms "comprising" or "including" and the like in the present disclosure is intended to mean that the elements or items listed before the term cover the elements or items listed after the term and their equivalents, but not to exclude other elements or items.
On one hand, as shown in fig. 1, the invention provides a multiple-activation bidirectional pressure relief device for releasing the annular confining pressure of a casing, which comprises a casing 1 and at least one group of pressure relief components 2 arranged on the casing 1, wherein the casing 1 comprises a first cylindrical section 101, a second cylindrical section 102 and a third cylindrical section 103 which are sequentially connected and coaxially arranged, the inner diameters of the first cylindrical section 101 and the third cylindrical section 103 are smaller than the inner diameter of the second cylindrical section 102, and the first cylindrical section 101 and the third cylindrical section 103 are respectively in threaded connection with two casings in a deepwater casing, so that the casing 1 is communicated with the interior of the deepwater casing; the pressure relief assembly 2 can be communicated with the interior of the annular trap and the interior of the deepwater casing pipe and is used for pressure relief through pressure difference between the annular trap and the interior of the deepwater casing pipe.
In a specific embodiment, the casing 1 further comprises a fourth cylinder segment 104 and a fifth cylinder segment 105 having the same diameter as the second cylinder segment 102, wherein the bottom of the fourth cylinder segment 104 is connected to the top of the first cylinder segment 101, and the top of the fifth cylinder segment 105 is connected to the bottom of the third cylinder segment 103.
In a specific embodiment, the pressure relief assembly 2 includes a protrusion 3 axially disposed along an outer surface of the housing 1, a first main fluid channel 301, a second main fluid channel 302, a third main fluid channel 303, a fourth main fluid channel 304, and a fifth main fluid channel 305 are disposed in the protrusion 3, a first pressure relief control mechanism 4 is disposed in the first main fluid channel 301, a second pressure relief control mechanism 5 is disposed in the fourth main fluid channel 304, a hydraulic oil injection hole 6 communicated with the first main fluid channel 301 and a pressure relief hole 7 communicated with the fourth main fluid channel 304 are disposed on the protrusion 3, and a hydraulic oil injection hole plug (not shown in the drawings) is disposed at an inlet of the hydraulic oil injection hole 6;
the first main fluid channel 301 longitudinally penetrates through the bulge 3, the top of the first main fluid channel 301 is communicated with the annular ring of the deep water sleeve, and the bottom of the first main fluid channel 301 is provided with a first plug 306;
the second main fluid channel 302 is arranged on the upper portion of the left side of the first main fluid channel 301 in parallel, and is communicated with the first main fluid channel 301 through a first connecting channel 307, a second connecting channel 308 and a third connecting channel 309 which are arranged in parallel from top to bottom, and a second plug 310 is arranged at the top of the second main fluid channel 302;
the third main fluid channel 303 is arranged at the lower part of the left side of the first main fluid channel 301 in parallel and is communicated with the first main fluid channel 301 through a fourth connecting channel 311 and a fifth connecting channel 312 which are arranged in parallel from top to bottom, and the bottom of the third main fluid channel 303 is provided with a third plug 313;
the fourth main fluid channel 304 longitudinally penetrates through the protrusion 3 and is arranged on the right side of the first main fluid channel 301 in parallel, and is communicated with the first main fluid channel 301 through a sixth connecting channel 314 and a seventh connecting channel 315 which are arranged in parallel from top to bottom, the top of the fourth main fluid channel 304 is provided with a fourth plug 316, and the bottom of the fourth main fluid channel is provided with a fifth plug 317;
the main fluid channel five 305 is arranged on the rear side of the main fluid channel one 301 in parallel, communicated with the main fluid channel one 301 through a connecting channel eight 318, communicated with the main fluid channel four 304 through a connecting channel nine 319, and communicated with the interior of the deep water casing through a connecting channel ten 320, the connecting channel ten 320 is arranged between the main fluid channel five 305 and the second cylindrical section 102, and the bottom of the main fluid channel five 305 is provided with a plug six 321;
the pressure relief control mechanism I4 comprises a disc spring guide rod I401, a disc spring group I402, a piston I403, a piston II 404, a piston III 405, a disc spring guide rod II 406, a disc spring group II 407 and a piston IV 408 which are sequentially arranged from top to bottom, wherein the disc spring group I402 is sleeved on the outer surface of the disc spring guide rod I401, and the disc spring group II 407 is sleeved on the outer surface of the disc spring guide rod II 406;
in the initial state, the top of the first disc spring guide rod 401 is located at a lower level than the level of the first connecting channel 307, so that the fluid in the first main fluid channel 301 can flow into the second main fluid channel 302 through the first connecting channel 307; the bottom of the piston four 408 is at a level higher than the level of the connecting channel eight 318, so that the fluid in the main fluid channel five 305 can flow into the main fluid channel one 301 through the connecting channel eight 318;
a cavity I409 is reserved between the piston I403 and the piston II 404, so that fluid in the main fluid channel II 302 can enter the main fluid channel I301 through the connecting channel II 308; a second cavity 410 is reserved between the second piston 404 and the third piston 405, and the second cavity 410 is communicated with the hydraulic oil injection hole 6 and is used for storing hydraulic oil; the middle portions of the third piston 405 and the fourth piston 408 are each provided with an annular groove, so that the fluid in the main fluid passage two 302 flows into the main fluid passage four 304 through the connecting passage three 309 and the connecting passage six 314, and the fluid in the main fluid passage three 303 flows into the main fluid passage four 304 through the connecting passage four 311 and the connecting passage seven 317;
the second pressure relief control mechanism 5 comprises a first compression assembly 501 and a second compression assembly 502, the first compression assembly 501 and the second compression assembly 502 both comprise a third disc spring guide rod 503 and a third disc spring group 504, and the third disc spring group 504 is sleeved on the outer surface of the third disc spring guide rod 503; in an initial state, the first compression element 501 blocks the pressure relief hole 7, and the second compression element 502 blocks the connecting passage nine 319.
In the above embodiment, the hydraulic oil in the second cavity 410 can perform the functions of lubrication and pressure transmission. When the pressure difference between the inside and the outside of the sleeve is within a safe range, the connecting channel between the second main fluid channel 302 and the fourth main fluid channel 304 and the connecting channel between the third main fluid channel 303 and the fourth main fluid channel 304 are blocked by the pressure relief control mechanism, so that the normal operation is ensured to be smoothly carried out.
In one particular embodiment, the primary fluid passage two 302 and the primary fluid passage three 303 are disposed in facing relationship. Pressure release subassembly 2 sets up a plurality ofly, and is a plurality of pressure release subassembly 2 evenly distributed is in on the casing 1. Optionally, three pressure relief assemblies are provided. And sealing rings (not shown in the figure) are arranged on the outer surfaces of the first piston 403, the second piston 404, the third piston 405 and the fourth piston 408. The first plug 306, the second plug 310, the third plug 313, the fourth plug 316, the fifth plug 317 and the sixth plug 321 are all fixed by snap springs (not shown in the figure).
It should be noted that the inner diameters of the main fluid channels and the connecting channels, and the number of the disc springs in each disc spring group are set according to a pressure difference threshold for pressure relief, and under the condition of the same pressure relief pressure difference threshold, the number of the pressure relief assemblies also affects the inner diameters of the main fluid channels and the connecting channels, and the number of the disc springs.
In a specific embodiment, the disc spring guide rod one 401 comprises a piston section and a guide rod section which are connected, the disc spring guide rod two 406 comprises a threaded section and a guide rod section which are connected, and the disc spring guide rod two 406 is in threaded connection with the piston three 405.
On the other hand, the invention also provides a multi-activation bidirectional pressure relief method for releasing the annular confining pressure of the sleeve, which adopts any one of the multi-activation bidirectional pressure relief devices for releasing the annular confining pressure of the sleeve to perform pressure relief;
fluid in the annular trap enters the first main fluid channel 301 from the top of the first main fluid channel 301 and enters the second main fluid channel 302 through the first connecting channel 307, and annular trap fluid in the second main fluid channel 302 enters the first cavity 409 through the second connecting channel 308;
fluid inside the deep water casing enters the main fluid channel five 305 through the connecting channel ten 320 and enters the main fluid channel one 301 through the connecting channel eight 318, and fluid inside the deep water casing inside the main fluid channel one 301 enters the main fluid channel three 303 through the connecting channel five 312;
when the pressure of the fluid in the annular trap is higher than that of the fluid in the deep water casing and the pressure difference is higher than a pressure relief threshold value one, the first pressure relief control mechanism 4 is compressed downwards as a whole, the annular groove in the middle of the piston three 405 is communicated with the connecting channel three 309 and the connecting channel six 314, so that the annular trap fluid enters the main fluid channel four 304, and then the second compression assembly 502 in the main fluid channel four 304 is compressed downwards, so that the connecting channel nine 319 is opened, and therefore the annular trap is communicated with the interior of the deep water casing through the main fluid channel five 305 and the connecting channel ten 320, and therefore pressure is relieved;
when the pressure of the fluid in the deep water sleeve is larger than that of the fluid in the annular trap and the pressure difference is larger than a second pressure relief threshold value, the first pressure relief control mechanism 4 is compressed upwards as a whole, the annular groove in the middle of the piston four 408 is communicated with the connecting channel four 311 and the connecting channel seven 315, so that the fluid in the deep water sleeve enters the main fluid channel four 304, then the first compression assembly 501 in the main fluid channel four 304 is compressed upwards, the pressure relief hole 7 is opened, and the interior of the deep water sleeve is communicated with the annular trap through the pressure relief hole 7, so that pressure is relieved.
In a specific embodiment, the first pressure relief threshold is the same as the second pressure relief threshold. In a specific embodiment, the first pressure relief threshold is greater than or less than the second pressure relief threshold. It should be noted that the first pressure relief threshold and the second pressure relief threshold are set according to actual conditions, and after the first pressure relief threshold and the second pressure relief threshold are determined, the inner diameters of each main fluid channel and each connecting channel in the pressure relief assembly and the number of disc springs are determined.
In conclusion, the pressure relief assembly utilizes the pressure difference between the inside and the outside of the sleeve as the power of the pressure relief assembly, so that the pressure relief assembly can relieve pressure through the pressure difference.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A multi-activation bidirectional pressure relief device for releasing the annular confining pressure of a sleeve is characterized by comprising a shell and at least one group of pressure relief components 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 that of the second cylinder section, and the first cylinder section and the third cylinder section are respectively in threaded connection with two sleeves in a deep water sleeve so as to enable the shell to be communicated with the interior of the deep water sleeve; the pressure relief assembly can be communicated with the annular trap and the interior of the deep water casing and is used for relieving pressure through the pressure difference between the annular trap and the interior of the deep water casing;
the pressure relief assembly comprises a bulge axially arranged along the outer surface of the shell, a main fluid channel I, a main fluid channel II, a main fluid channel III, a main fluid channel IV and a main fluid channel V are arranged in the bulge, a pressure relief control mechanism I is arranged in the main fluid channel I, a pressure relief control mechanism II is arranged in the main fluid channel IV, a hydraulic oil injection hole communicated with the main fluid channel I and a pressure relief hole communicated with the main fluid channel IV are arranged on the bulge, and a hydraulic oil injection hole plug is arranged at the inlet of the hydraulic oil injection hole;
the first main fluid channel longitudinally penetrates through the bulge, the top of the first main fluid channel is communicated with the deep water sleeve ring in a closed mode, and the bottom of the first main fluid channel is provided with a first plug;
the main fluid channel II is arranged on the upper portion of the left side of the main fluid channel I in parallel and communicated with the main fluid channel I through a connecting channel I, a connecting channel II and a connecting channel III which are arranged in parallel from top to bottom, and a plug II is arranged at the top of the main fluid channel II;
the main fluid channel III is arranged on the lower portion of the left side of the main fluid channel I in parallel and is communicated with the main fluid channel I through a connecting channel IV and a connecting channel V which are arranged in parallel from top to bottom, and a plug III is arranged at the bottom of the main fluid channel III;
the main fluid channel IV longitudinally penetrates through the protrusion and is arranged on the right side of the main fluid channel I in parallel, and is communicated with the main fluid channel I through a connecting channel VI and a connecting channel VII which are arranged in parallel from top to bottom, the top of the main fluid channel IV is provided with a plug IV, and the bottom of the main fluid channel IV is provided with a plug V;
the main fluid channel five is arranged on the rear side of the main fluid channel I in parallel, is communicated with the main fluid channel I through a connecting channel eight, is communicated with the main fluid channel four through a connecting channel nine, and is communicated with the interior of the deep water sleeve through a connecting channel ten, the connecting channel ten is arranged between the main fluid channel five and the second cylinder section, and the bottom of the main fluid channel five is provided with a plug six;
the first pressure relief control mechanism comprises a first disc spring guide rod, a first disc spring group, a first piston, a second piston, a third piston, a second disc spring guide rod, a second disc spring group and a fourth piston which are sequentially arranged from top to bottom, the disc spring group is sleeved on the outer surface of the first disc spring guide rod, and the second disc spring group is sleeved on the outer surface of the second disc spring guide rod;
in an initial state, the level of the top of the disc spring guide rod I is lower than that of the connecting channel I, so that fluid in the main fluid channel I can flow into the main fluid channel II through the connecting channel I; the horizontal plane of the bottom of the piston IV is higher than the horizontal plane of the connecting channel VIII, so that the fluid in the main fluid channel V can flow into the main fluid channel I through the connecting channel VIII;
a first cavity is reserved between the first piston and the second piston, so that fluid in the main fluid channel II can enter the first main fluid channel through the second connecting channel; a second cavity is reserved between the second piston and the third piston and is communicated with the hydraulic oil injection hole for storing hydraulic oil; the middle parts of the third piston and the fourth piston are respectively provided with an annular groove, so that the fluid in the main fluid channel II flows into the main fluid channel IV through the third connecting channel and the sixth connecting channel, and the fluid in the main fluid channel III flows into the main fluid channel IV through the fourth connecting channel and the seventh connecting channel;
the pressure relief control mechanism II comprises a compression assembly I and a compression assembly II, the compression assembly I and the compression assembly II both comprise a disc spring guide rod III and a disc spring group III, and the disc spring group III is sleeved on the outer surface of the disc spring guide rod III; in an initial state, the first compression assembly blocks the pressure relief hole, and the second compression assembly blocks the connecting channel nine.
2. The multiple activation bi-directional pressure relief device for relieving cannula annulus entrapment pressure of claim 1 wherein there are a plurality of pressure relief assemblies and the plurality of pressure relief assemblies are evenly distributed on the housing.
3. The multiple-activation bidirectional pressure relief device for releasing the annulus trapping pressure of a cannula according to claim 1, wherein the outer surfaces of the first piston, the second piston, the third piston and the fourth piston are provided with sealing rings.
4. The multiple-activation bidirectional pressure relief device for releasing the annulus trapping pressure of a casing according to claim 1, wherein the first plug, the second plug, the third plug, the fourth plug, the fifth plug and the sixth plug are all fixed by snap springs.
5. The multiple-activation, bi-directional pressure relief device for relieving cannula annulus trapping pressure of claim 1, wherein said second disc spring guide rod is threadably connected to said third piston.
6. A multi-activation bidirectional pressure relief method for releasing the annular closing pressure of a sleeve is characterized in that the multi-activation bidirectional pressure relief device for releasing the annular closing pressure of the sleeve according to any one of claims 1 to 5 is adopted for pressure relief;
fluid in the annular trap enters the first main fluid channel from the top of the first main fluid channel and enters the second main fluid channel through the first connecting channel, and the annular trap fluid in the second main fluid channel enters the first cavity through the second connecting channel;
fluid in the deep water sleeve enters the main fluid channel five through the connecting channel ten and enters the main fluid channel I through the connecting channel eight, and fluid in the deep water sleeve in the main fluid channel I enters the main fluid channel three through the connecting channel five;
when the pressure of fluid in the annular trap is larger than that of fluid in the deep water sleeve and the pressure difference is larger than a pressure relief threshold value one, the pressure relief control mechanism I is compressed downwards integrally, the annular groove in the middle of the piston III is communicated with the connecting channel III and the connecting channel VI, so that the annular trap fluid enters the main fluid channel IV, then the compression assembly II in the main fluid channel IV is compressed downwards, the connecting channel nine is opened, and the annular trap is communicated with the interior of the deep water sleeve through the main fluid channel five and the connecting channel ten, so that pressure is relieved;
when the pressure of fluid in the deep water sleeve is larger than that of fluid in the annular trap and the pressure difference is larger than a pressure relief threshold value II, the pressure relief control mechanism I is compressed upwards as a whole, the annular groove in the middle of the piston IV is communicated with the connecting channel IV and the connecting channel VII, so that the fluid in the deep water sleeve enters the main fluid channel IV and then is compressed upwards to open the pressure relief hole, and the interior of the deep water sleeve is communicated with the annular trap through the pressure relief hole, so that pressure is relieved.
7. The multiple-activation bi-directional pressure relief method of relieving cannula annulus trapping pressure of claim 6, wherein said first pressure relief threshold is the same as said second pressure relief threshold.
8. The multiple-activation bi-directional pressure relief method of relieving cannula annulus trapping pressure of claim 6, wherein said first pressure relief threshold is greater than said second pressure relief threshold.
9. The multiple-activation bi-directional pressure relief method of relieving cannula annulus trapping pressure of claim 6, wherein said first pressure relief threshold is less than said second pressure relief threshold.
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