CN115370316B - Double-anchoring high-pressure packer - Google Patents
Double-anchoring high-pressure packer Download PDFInfo
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- CN115370316B CN115370316B CN202211064021.0A CN202211064021A CN115370316B CN 115370316 B CN115370316 B CN 115370316B CN 202211064021 A CN202211064021 A CN 202211064021A CN 115370316 B CN115370316 B CN 115370316B
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- 238000004873 anchoring Methods 0.000 title claims abstract description 40
- 238000007789 sealing Methods 0.000 claims abstract description 104
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000010008 shearing Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract 4
- 238000002955 isolation Methods 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 239000010720 hydraulic oil Substances 0.000 claims description 8
- 239000003112 inhibitor Substances 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1295—Packers; Plugs with mechanical slips for hooking into the casing actuated by fluid pressure
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a double-anchoring high-pressure packer which is used for oil field underground well completion. The double-anchoring high-pressure packer comprises a hydraulic anchoring mechanism, wherein the hydraulic anchoring mechanism comprises a constant pressure mechanism. The constant pressure mechanism comprises a constant pressure sleeve I, an inner bushing, a shear pin ring, a shear pin, a stop ring and a pressure cap which are coaxially arranged in the anchor body and the central tube. The constant pressure mechanism can also be realized in such a way that the constant pressure mechanism comprises a constant pressure sleeve II, a piston, a isolating plug, a shear pin ring and a shear pin thereof which are coaxially sleeved in the anchor body; the constant pressure mechanism can also be realized by comprising a separation sleeve and a piston which are coaxially sleeved in the anchor body and the central tube, wherein a plunger hole is arranged on the central tube body, a plunger, a screw sleeve and a shearing pin are arranged on the central tube body, and a pressure guide hole I and a pressure guide hole II are arranged to communicate a lower cavity of the piston with an inner hole of the central tube; further, a vent hole and a blind plug are arranged at the upper part of the anchor body, and a communication hole and a sealing joint are arranged on the piston. The invention improves the pressure bearing capacity of the double-anchoring high-pressure packer.
Description
Technical Field
The invention belongs to the technical field of underground packers for oilfield development, and particularly relates to a double-anchoring high-pressure packer for high-pressure oil-gas well completion.
Background
Downhole packers are one of the most important tools for oilfield development and are widely used in oil and gas injection and production wells. With the progress of oil and gas development technology, the development depth of oil and gas wells is deeper, the pressure is higher, and the performance requirement on underground packers is higher.
Chinese patent, application number 202011453193.8, filing date 2020.12.11, patent designation "a packer resistant to high temperature and high pressure" discloses a packer with bi-directional anchoring. The packer rubber is centered, the cone and the slips are respectively arranged on two sides, and the structure is favorable for bearing high pressure of the packer. However, in experiments and in use, it was found that when subjected to a large pressure differential, the packer is unseated when the piston force is greater than the shear force of the unseating shear pin or ring, as the center tube is subjected to a large piston force, which is transmitted to the unseating shear pin or ring.
Disclosure of Invention
In order to solve the technical problems, the invention provides a double-anchoring high-pressure packer, solves the problems of insufficient pressure bearing capacity and easiness in deblocking of the existing double-anchoring packer, and improves the capacity of sealing pressure difference of the packer.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The double-anchoring high-pressure packer is characterized in that a hydraulic anchoring mechanism is arranged at the upper part of the packer, and a constant pressure mechanism is arranged in the hydraulic anchoring mechanism.
As one of the preferred embodiments, the constant pressure mechanism comprises a constant pressure sleeve I, the constant pressure sleeve is sleeved in an inner hole of the anchor body in a shaft mode, an upper sealing surface I and a lower sealing surface I are formed between the constant pressure sleeve I and the anchor body at the upper side and the lower side of the anchor tooth pressure transmission hole, a sealing ring I is arranged at the upper sealing surface I, and a sealing ring II is arranged at the lower sealing surface I; the upper end of the inner hole of the central tube is coaxially and fixedly connected with an inner bushing, the upper part of the inner bushing is coaxially sleeved in the inner hole at the lower part of the constant pressure sleeve, a sealing surface III is formed between the inner bushing and the constant pressure sleeve I, a sealing ring IV is arranged, and a sealing ring III is arranged between the inner bushing and the central tube; the diameter of the first upper sealing surface is larger than that of the third sealing surface; the periphery of the lower end of the constant pressure sleeve is provided with a shear pin groove and sleeved with a shear pin ring, shear pins are arranged on the shear pin ring, and the lower end face of the shear pin ring is contacted with the upper end face of the central tube; balance holes are radially arranged on the anchor body above the connecting threads of the central tube and the anchor body. The annular space between the inner hole of the anchor body and the first fixed pressure sleeve is provided with a stop ring above the shear pin ring, a pressure cap fixed stop ring is arranged between the stop ring and the shear pin ring, and zigzag threads are oppositely arranged between the first fixed pressure sleeve and the stop ring.
As a second preferred embodiment, the constant pressure mechanism comprises a second constant pressure sleeve, the second constant pressure sleeve is coaxially sleeved in an inner hole of the anchor body, and a fifth sealing ring is arranged between the upper end of the second constant pressure sleeve and the anchor body; sequentially sleeving a piston and a isolating plug above the central tube in an annulus between the lower part of the inner hole of the anchor body and the fixed pressure sleeve II; a sealing ring ten and a sealing ring nine are respectively arranged between the upper part and the lower part of the inner hole of the piston and the periphery of the constant pressure sleeve, and a pressure transmission hole is arranged on the two side walls of the constant pressure sleeve between the sealing ring ten and the sealing ring nine; a communication hole is axially arranged on the piston body; an upper sealing surface II and a lower sealing surface II are formed between the upper part and the lower part of the inner hole of the isolation plug and the periphery of the constant pressure sleeve, a sealing ring eight is arranged at the upper sealing surface II, a sealing ring seven is arranged at the lower sealing surface II, and the diameter of the upper sealing surface II is larger than that of the lower sealing surface II; a sealing ring six and a sealing ring eleven are respectively arranged between the upper part and the lower part of the periphery of the isolation plug and the inner hole of the anchor body, a conducting hole is radially arranged in the middle of the isolation plug, and a balance hole is radially arranged on the anchor body opposite to the conducting hole; and a shear pin groove is formed in the periphery of the lower end of the fixed pressure sleeve II, a shear pin ring is sleeved with the shear pin groove, shear pins are arranged on the shear pin ring, and the lower end face of the shear pin ring is contacted with the upper end face of the inner hole of the central tube. Further, a vent hole is formed in the upper portion of the anchor body, the vent hole is communicated with an annulus between the outer portion of the anchor body and the fixed pressure sleeve II and the anchor body, and a blind plug is connected to an outer opening of the vent hole through threads; the lower opening of the communication hole is connected with a sealing joint through threads, and hydraulic oil or corrosion inhibitor solution is filled in the closed cavity; still further, set up zigzag locking screw thread relatively on fixed pressure cover two and the shear pin ring, the shear pin ring is the C shape ring, the shear pin ring up end with the terminal surface contact under the isolation plug.
As a third preferred embodiment, the constant pressure mechanism comprises a spacer sleeve, the spacer sleeve is coaxially sleeved in the inner holes of the anchor body and the central tube, and the upper end and the lower end of the spacer sleeve are respectively sealed with the anchor body and the central tube; the annular space between the anchor body and the isolation sleeve is coaxially sleeved with a piston, the inner hole and the periphery of the piston are respectively sealed with the isolation sleeve and the anchor body, and a communication hole is axially arranged on the body of the piston; a plunger hole is arranged on the upper shaft of the central tube body, a plunger is arranged in the plunger hole, and a pressure guide hole is radially arranged at the upper end of the plunger hole to communicate the plunger hole with the inner hole of the central tube; an upper sealing ring and a lower sealing ring are arranged at the upper part of the plunger, a right-angle pressure guide hole II is arranged on the central tube body to communicate with an annulus between a lower cavity of the piston and the upper sealing ring and the lower sealing ring arranged on the plunger; the lower end of the plunger hole is connected with the screw sleeve in a threaded manner, the lower end of the plunger is coaxially sleeved in an inner hole of the screw sleeve, and a shearing pin is arranged at the sleeved overlapping part of the screw sleeve and the plunger and radially penetrates through the screw sleeve and the plunger at the same time. Further, the upper part of the anchor body is provided with a vent hole, the vent hole is communicated with an annulus between the outside of the anchor body and the isolation sleeve and the anchor body, and a blind plug is connected with an outer opening of the vent hole through threads; and the lower opening of the communication hole is connected with a sealing joint through threads, and hydraulic oil or corrosion inhibitor solution is filled in the closed cavity.
Compared with the prior art, the invention has the advantages that:
1. the hydraulic anchoring mechanism is arranged above the double-slip anchoring sealing mechanism of the original double-anchoring packer, so that the stress state of the packer is improved, and the lower piston force applied to the central tube is simultaneously transmitted to the deblocking shear pin (or shear ring) and the hydraulic anchoring mechanism, so that the packer can bear higher lower pressure without deblocking.
2. The hydraulic anchoring mechanism is internally provided with a constant pressure mechanism, when setting, the constant pressure mechanism is opened at the pressure above the set pressure, and the anchor teeth extend out and are anchored on the inner wall of the sleeve. By the aid of the structural design, stress of the double-slip anchoring sealing mechanism of the packer is improved, and compared with a hydraulic anchoring mechanism without a constant pressure mechanism, setting distance of a rubber cylinder is increased.
3. The upper cavity of the piston is filled with hydraulic oil, so that the working environment of the anchor teeth is improved, when the hydraulic oil is used in a water injection well or an oil well with higher water content, the problem of operation clamping pipe column caused by scaling at the inner end of the anchor teeth can be prevented, the inner wall of an anchor tooth hole can be lubricated, and the service life of an anchor tooth sealing ring is prolonged.
The technical scheme of the invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
The invention will be more fully understood and many of the attendant advantages thereof will be readily appreciated by reference to the following detailed description when considered in conjunction with the accompanying drawings, which are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, exemplary embodiments of the invention and their description serve to explain the invention and do not constitute a limitation to the invention.
FIG. 1 is a schematic illustration of the structure of a dual anchored high pressure packer of the present invention.
Fig. 2 is a schematic structural view of a first embodiment of a hydraulic anchoring mechanism.
Fig. 3 is a schematic structural view of a second embodiment of the hydraulic anchoring mechanism.
Fig. 4 is a schematic diagram of a second modified structure of the hydraulic anchoring mechanism embodiment.
Fig. 5 is a schematic structural view of a third embodiment of a hydraulic anchoring mechanism.
FIG. 6 is a cross-sectional view of the center tube at A-A in FIG. 5.
In the figure: 1-anchor body, 2-anchor tooth mechanism, 3-upper slip, 4-upper cone, 5-packing element, 6-lower cone, 7-lower slip, 8-piston cylinder mechanism, 9-center tube, 10-hydraulic anchor mechanism, 201-seal ring one, 202-seal ring two, 203-retaining ring, 204-press cap, 205-shear pin ring, 206-shear pin, 207-balance hole, 208-seal ring three, 209-inner bushing, 210-seal ring four, 211-constant pressure sleeve one, 212-anchor tooth pressure transmitting hole, 301-seal ring five, 302-constant pressure sleeve two, 303-piston, 304-communication hole, 305-seal ring six, 306-isolation plug, 308-seal ring seven, 309-seal ring eight, 310-seal ring nine, 311-pressure transmitting hole, 312-seal ring ten, 313-seal ring eleven, 314-pressure transmitting hole, 401-blind plug, 402-bleed hole, 403-seal joint, 404-closure cavity, 501-isolation sleeve, 502-pressure transmitting hole one, 503-pressure transmitting hole two, 504-plunger, 505-shear pin, 506-shear pin.
Detailed Description
The terms "upper" and "lower" in terms of positional relationship in the present specification and claims are described in terms of the state of the tool when in use, as shown in fig. 1, with the hydraulic anchoring mechanism uppermost in the tool. The other "left", "right", "high" and "low" are relative relationships described in terms of the positional relationship seen by the reader, the top of the page being high, the bottom of the page being low, the left side of the page being left, the right side of the page being right. When describing the inside and outside of the pipe, the radially small radius is taken as the inside or the inside, and the radially large radius is taken as the outside. In the drawings, the sealing rings are shown without reference numerals, and according to the drawings, the description is omitted.
The pressure is classified according to the underground sealing pressure of the oil field, and is generally more than 35MPa and is called high pressure. The packer of the present invention is capable of sealing differential pressures up to 70MPa and is therefore referred to as a dual anchored high pressure packer.
Referring to fig. 1, the dual-anchoring high-pressure packer comprises a dual-slip anchoring sealing mechanism, a piston hydraulic cylinder mechanism 8 and the like, wherein the dual-slip anchoring sealing mechanism comprises an upper slip 3, an upper cone 4, a rubber cylinder 5, a lower cone 6, a lower slip 7 and the like which are sleeved on a central pipe 9, the piston hydraulic cylinder mechanism 8 comprises a setting piston and a hydraulic cylinder sleeve, the specific structure of the packer is simplified in the figure, the specific structure is known in the prior art, and the specific structure is shown in China patent, application number 202011453193.8, application date 2020.12.11 and the patent name of the packer is a high-temperature and high-pressure resistant packer. In addition to the above configuration, a hydraulic anchoring mechanism 10 is provided above the double slip anchoring seal mechanism at the upper portion of the center tube. The hydraulic anchoring mechanism comprises an anchor body 1 and an anchor tooth mechanism 2. The anchor tooth mechanism comprises an anchor tooth, a pressing plate, a spring, a screw and the like, is a known technology and is widely applied to hydraulic anchor tools. The anchor teeth are arranged in the anchor teeth holes, and the bottom of each anchor teeth hole is provided with an anchor teeth pressure transmission hole 212 which is communicated with the central hole of the anchor body. The hydraulic anchoring mechanism 10 is also provided with a constant pressure mechanism.
In a first embodiment, referring to fig. 2, the constant pressure mechanism includes a constant pressure sleeve 211, which is coaxially sleeved in the inner hole of the anchor body 1, and an upper sealing surface and a lower sealing surface are formed between the constant pressure sleeve and the anchor body at the upper side and the lower side of the anchor tooth pressure transmission hole 212. The upper and lower sides of the anchor pressure transferring holes 212 are the upper and lower sides of the two anchor pressure transferring holes 212 that are farthest apart. The first sealing ring 201 is arranged at the first position of the upper sealing surface, and the second sealing ring 202 is arranged at the first position of the lower sealing surface. An inner bushing 209 is coaxially and fixedly connected to the upper end of the inner hole of the central tube 9, the upper part of the inner bushing is coaxially sleeved in the inner hole at the lower part of the constant pressure sleeve, a sealing surface III is formed between the inner bushing and the constant pressure sleeve I, a sealing ring IV 210 is arranged, and a sealing ring III 208 is arranged between the inner bushing and the central tube; the diameter of the first upper sealing surface is larger than that of the third sealing surface; the periphery of the lower end of the constant pressure sleeve is provided with a shear pin groove and sleeved with a shear pin ring 205, a shear pin 206 is arranged on the shear pin ring, the inner end of the shear pin extends into the shear pin groove, and the lower end face of the shear pin ring is contacted with the upper end face of the central tube. Balance holes 207 are provided radially in the anchor above the center tube and anchor connection threads.
The inner sealing ring or the outer sealing ring shown in the drawings is changed according to the size of the tool, and the outer sealing ring on the shaft can be changed into the inner sealing ring in the hole, and vice versa, so that the scheme content of the invention is not affected, and the description is omitted.
Because the diameter of the first upper sealing surface is larger than that of the third sealing surface, a pressure difference surface is formed on the first constant pressure sleeve, when the piston force formed by the internal and external pressure differences of the packer is larger than the shearing force of the shear pins, the shear pins are sheared by the first constant pressure sleeve to descend, the first sealing ring 201 is separated from the first upper sealing surface, and the pressure in the packer is pushed out of the anchor teeth through the anchor tooth pressure transmission holes 212 to be anchored on the inner wall of the sleeve.
Further, in order to prevent the constant pressure sleeve from unexpected ascending after descending, a stop ring 203 is arranged above the shear pin ring in the annulus between the inner hole of the anchor body and the constant pressure sleeve I, a pressure cap 204 is arranged between the stop ring and the shear pin ring, and the pressure cap 204 is in threaded connection with the inner hole of the anchor body and is used for preventing the axial movement of the stop ring. The zigzag thread is a known technology and is widely applied to the underground hydraulic packer.
In the second embodiment, referring to fig. 3, the constant pressure mechanism includes a second constant pressure sleeve 302, the second constant pressure sleeve 302 is coaxially sleeved in the inner hole of the anchor body 1, and a fifth sealing ring 301 is arranged between the upper end of the second constant pressure sleeve and the anchor body; a piston 303 and a isolating plug 306 are sleeved in the annulus between the lower part of the inner hole of the anchor body and the second constant pressure sleeve in sequence above the central tube 9; a seal ring ten 312 and a seal ring nine 310 are respectively arranged between the upper part and the lower part of the inner hole of the piston and the periphery of the constant pressure sleeve, and a pressure transmission hole 311 is arranged on the two side walls of the constant pressure sleeve between the seal ring ten and the seal ring nine; a communication hole 304 is axially arranged on the piston body; an upper sealing surface II and a lower sealing surface II are formed between the upper part and the lower part of the inner hole of the isolation plug and the periphery of the constant pressure sleeve, a sealing ring eight 309 is arranged at the upper sealing surface II, a sealing ring seven 308 is arranged at the lower sealing surface II, and the diameter of the upper sealing surface II is larger than that of the lower sealing surface II. And a seal ring six 305 and a seal ring eleven 313 are respectively arranged between the upper part and the lower part of the periphery of the isolation plug and the inner hole of the anchor body, and a guide hole 314 is radially arranged in the middle of the isolation plug. Opposite the conduction holes, balancing holes 207 are radially provided in the anchor body. And a shear pin groove is formed in the periphery of the lower end of the second constant pressure sleeve, a shear pin ring 205 is sleeved on the shear pin groove, a shear pin 206 is arranged on the shear pin ring, the inner end of the shear pin extends into the shear pin groove, and the lower end face of the shear pin ring is contacted with the upper end face of the inner hole of the central tube.
Because the diameter of the upper sealing surface II is larger than that of the lower sealing surface II, a pressure difference surface is formed on the fixed pressure sleeve II, when the piston force formed by the internal and external pressure differences of the packer is larger than the shearing force of the shear pins, the fixed pressure sleeve II shears the shear pins downwards, the sealing ring III 310 is separated from the sealing surface, the pressure in the packer is transmitted to the anchor teeth through the pressure transmission holes 311, the communication holes 304 and the anchor tooth pressure transmission holes 212 in sequence, and the anchor teeth are pushed out to be anchored on the inner wall of the sleeve.
Further, a closed cavity 404 is formed and is filled with a protective liquid on the basis of a scheme II, referring to fig. 4, a vent hole 402 is arranged at the upper part of the anchor body, the vent hole is communicated with the annular space between the outside of the anchor body and the fixed pressure sleeve II 302 and the anchor body, and a blind plug 401 is connected with the outer opening of the vent hole in a threaded manner; a seal joint 403 is screwed to the lower opening of the communication hole 304. The sealing joint 403 comprises a double male joint and a sealing cap, and is commonly used in a ground hydraulic control cabinet system and is a known technology. After the blind plug and the sealing joint are arranged, a closed cavity 404 is formed among the piston 303, the anchor body 1 and the constant pressure sleeve II. Through sealing joint 403 and bleed hole 402, can fill protective liquid in closed cavity 404, like hydraulic oil, corrosion inhibitor solution etc. can protect the anchor tooth sealing washer from well liquid corrosion, can also prevent around the anchor tooth scale formation and cause the card tubular column when operation. Blind plug 401 and sealing joint 403 may be swapped in place. After the closed cavity 404 is formed, the piston 303 can move up and down in the annulus in which it is located under the pushing of pressure.
Still further, in order to prevent the second constant pressure sleeve from being forced upward after descending, and to improve the service life of the sealing ring, the second constant pressure sleeve (302) and the shear pin ring (205) are provided with saw-tooth locking threads relatively, the shear pin ring is a C-shaped ring, the upper end surface of the shear pin ring is contacted with the lower end surface of the isolating plug 306, wherein the locking thread length of the periphery of the lower end of the second constant pressure sleeve should exceed the descending distance thereof. As previously mentioned, locking thread arrangements are known in the art.
In the third embodiment, referring to fig. 5 and 6, the constant pressure mechanism includes a spacer 501 coaxially sleeved in the inner holes of the anchor body 1 and the central tube 9, and the upper and lower ends of the spacer are respectively sealed with the anchor body and the central tube; the annular space between the anchor body and the isolation sleeve is coaxially sleeved with a piston 303, the inner hole and the periphery of the piston are respectively sealed with the isolation sleeve and the anchor body, and a communication hole 304 is axially arranged on the body of the piston.
A plunger hole is provided in the upper shaft of the body of the central tube 9, preferably with an axis parallel to the axis of the central tube, in which plunger hole the plunger 504 is mounted. And a first pressure guide hole 502 is radially arranged at the upper end of the plunger hole, and the first pressure guide hole 502 is communicated with the plunger hole and the inner hole of the central tube.
An upper sealing ring and a lower sealing ring are arranged on the periphery of the upper part of the plunger 504, and a right-angle pressure guide hole II 503 is arranged on the central tube body. As shown in fig. 6, the lower end of the second pressure guiding hole 503 is communicated with the annulus between the upper sealing ring and the lower sealing ring arranged on the plunger. The upper end of the second pressure guide hole 503 is communicated with the lower cavity of the piston. In fig. 5, the second pressure guiding hole 503 is shown by a broken line.
The lower end of the plunger hole is connected with a threaded sleeve 506 in a threaded manner, the lower end of the plunger is coaxially sleeved in an inner hole of the threaded sleeve, and a shearing pin 505 is arranged at the sleeved and overlapped part of the threaded sleeve and the plunger and penetrates through the threaded sleeve and the plunger in the radial direction.
When the piston force generated by the pressure difference between the inside and the outside of the packer acting on the piston is larger than the shearing force of the shearing pin 505, the shearing pin is sheared by the piston to move downwards, and the pressure guide hole I is communicated with the pressure guide hole II. The pressure in the packer is transmitted to the anchor teeth through the first pressure guide hole, the second pressure guide hole, the communication hole and the anchor tooth pressure transmission holes, and the anchor teeth are pushed out to be anchored on the inner wall of the sleeve.
Further, the closed cavity 404 is formed and filled with the protection liquid in the modification of the third embodiment. The upper part of the anchor body is provided with a vent hole 402, the vent hole is communicated with the annular space between the outside of the anchor body and the isolation sleeve 501 and the anchor body, and the outer opening of the vent hole is in threaded connection with a blind plug 401; a seal joint 403 is screwed to the lower opening of the communication hole 304.
After the blind plug and sealing joint are arranged, a closed cavity 404 is formed among the piston 303, the anchor body 1 and the isolating sleeve 501. Through sealing joint 403 and bleed hole 402, can fill protective liquid in closed cavity 404, like hydraulic oil, corrosion inhibitor solution etc. can protect the anchor tooth sealing washer from well liquid corrosion, can also prevent around the anchor tooth scale formation and cause the card tubular column when operation. Blind plug 401 and sealing joint 403 may be swapped in place. After the closed cavity 404 is formed, the piston 303 can move up and down in the annulus in which it is located under the pushing of pressure.
It will be apparent that many modifications and variations are possible to those skilled in the art based on the spirit of the invention.
Claims (3)
1. The double-anchoring high-pressure packer is characterized in that a hydraulic anchoring mechanism is arranged at the upper part of the packer, and a constant pressure mechanism is arranged in the hydraulic anchoring mechanism;
The fixed pressure mechanism comprises a fixed pressure sleeve II (302), the fixed pressure sleeve II (302) is coaxially sleeved in an inner hole of the anchor body (1), and a sealing ring III (301) is arranged between the upper end of the fixed pressure sleeve II and the anchor body; sequentially sleeving a piston (303) and a isolating plug (306) above the central tube (9) in an annulus between the lower part of the inner hole of the anchor body and the fixed pressure sleeve II; a seal ring ten (312) and a seal ring nine (310) are respectively arranged between the upper and lower parts of the inner hole of the piston and the periphery of the constant pressure sleeve, and a pressure transmission hole (311) is arranged on the two side walls of the constant pressure sleeve between the seal ring ten and the seal ring nine; a communication hole (304) is axially arranged on the piston body; an upper sealing surface II and a lower sealing surface II are formed between the upper part and the lower part of the inner hole of the isolation plug and the periphery of the constant pressure sleeve, a sealing ring eight (309) is arranged at the upper sealing surface II, a sealing ring seven (308) is arranged at the lower sealing surface II, and the diameter of the upper sealing surface II is larger than that of the lower sealing surface II; a seal ring six (305) and a seal ring eleven (313) are respectively arranged between the upper and lower parts of the periphery of the isolation plug and the inner hole of the anchor body, a guide hole (314) is radially arranged in the middle of the isolation plug, and a balance hole (207) is radially arranged on the anchor body opposite to the guide hole; a shear pin groove is formed in the periphery of the lower end of the fixed pressure sleeve II, a shear pin ring (205) is sleeved on the shear pin groove, a shear pin (206) is arranged on the shear pin ring, and the lower end face of the shear pin ring is contacted with the upper end face of the inner hole of the central tube;
The upper part of the anchor body is provided with a vent hole (402), the vent hole is communicated with the outside of the anchor body and the annular space between the fixed pressure sleeve II (302) and the anchor body, and the outer opening of the vent hole is in threaded connection with a blind plug (401); the lower opening of the communication hole (304) is connected with a sealing joint (403) in a threaded manner, and a closed cavity (404) is filled with hydraulic oil or corrosion inhibitor solution;
and the fixed pressure sleeve II (302) and the shear pin ring (205) are oppositely provided with zigzag locking threads.
2. The double-anchoring high-pressure packer is characterized in that a hydraulic anchoring mechanism is arranged at the upper part of the packer, and a constant pressure mechanism is arranged in the hydraulic anchoring mechanism;
The constant pressure mechanism comprises a separation sleeve (501), the separation sleeve is coaxially sleeved in the inner holes of the anchor body (1) and the central tube (9), and the upper end and the lower end of the separation sleeve are respectively sealed with the anchor body and the central tube; a piston (303) is coaxially sleeved in the annular space of the anchor body and the isolation sleeve, the inner hole and the periphery of the piston are respectively sealed with the isolation sleeve and the anchor body, and a communication hole (304) is axially arranged on the body of the piston; a plunger hole is arranged on the upper shaft of the central tube (9) body, a plunger (504) is arranged in the plunger hole, and a pressure guide hole I (502) is radially arranged at the upper end of the plunger hole to communicate the plunger hole with the inner hole of the central tube; an upper sealing ring and a lower sealing ring are arranged at the upper part of the plunger (504), a right-angle pressure guide hole II (503) is arranged on the central tube body to communicate an annulus between a lower cavity of the piston and the upper sealing ring and the lower sealing ring arranged on the plunger; the lower end of the plunger hole is connected with a screw sleeve (506) in a threaded manner, the lower end of the plunger is coaxially sleeved in an inner hole of the screw sleeve, and a shearing pin (505) is arranged at the sleeved and overlapped part of the screw sleeve and the plunger and penetrates through the screw sleeve and the plunger in the radial direction.
3. The dual-anchoring high-pressure packer of claim 2, wherein a bleed hole (402) is formed in the upper portion of the anchor body, the bleed hole communicates with an annulus between the outside of the anchor body and the spacer (501) and the anchor body, and a blind plug (401) is screwed on the outer opening of the bleed hole; the lower opening of the communication hole (304) is connected with a sealing joint (403) in a threaded manner, and the closed cavity (404) is filled with hydraulic oil or corrosion inhibitor solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN115370316A (en) | 2022-11-22 |
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