A high temperature and high pressure gas-sealed APIB isolation valve

Abstract

The present invention relates to a high-temperature and high-pressure gas-tight APIB isolation valve, comprising an upper joint, a static pressure joint, a static pressure piston, a cannula core shaft, a switch cannula, a tie-back joint, an intermediate joint, a valve core assembly, a connecting joint and a lower joint, wherein the lower end of the upper joint is sealed and arranged inside the upper end of the static pressure joint, the upper part of the static pressure piston is located at the lower side of the upper joint, the lower part of the static pressure piston is sealed and arranged inside the static pressure joint, and the upper end of the cannula core shaft is sealed and arranged at the lower end of the static pressure joint; a switch cannula is arranged inside the cannula core shaft, the valve core assembly comprises a ball cage, a short valve seat, a ball valve core and a long valve seat, and the upper end of the pawl is sleeved on the outer side wall of the lower end of the switch cannula; the ball valve core comprises a valve core body, a through hole is arranged inside the valve core body, and the outer side wall of the valve core body is concave to form a first positioning hole and a second positioning hole. The present invention has the characteristics of being safe and reliable, easy to operate and able to withstand high temperature and high pressure.

Description

Technical Field

[0001] The invention relates to a high-temperature and high-pressure gas-sealed APIB isolation valve. Background Art

[0002] During the oil and gas well testing phase, the function of the isolation valve is to temporarily or permanently isolate the test string, so that the upper string operation and other operations can be carried out without killing the well. At present, there are many series of isolation valve specifications used for well completion in China, but most of them have pressure levels within 70MPa and temperature levels within 177℃. They meet the application requirements in ordinary reservoirs, but cannot meet the application requirements in high-temperature and high-pressure reservoirs (pressure level requirements reach 105MPa and temperature level reaches 204℃). Therefore, it is urgent to design a high-temperature and high-pressure gas-sealed APIB (Annulas Pressure Isolation BALLvavle, annulus pressure isolation ball valve) isolation valve. Summary of the invention

[0003] In view of the above problems existing in the prior art, the main purpose of the present invention is to provide a high-temperature and high-pressure gas-sealed APIB isolation valve.

[0004] The technical solution of the present invention is as follows:

[0005] A high-temperature and high-pressure gas-sealed APIB isolation valve comprises an upper joint, a static pressure joint, a static pressure piston, a cannula core shaft, a switch cannula, a tie-back joint, an intermediate joint, a valve core assembly, a connecting joint and a lower joint, wherein:

[0006] The lower end of the upper joint is sealed inside the upper end of the static pressure joint, the upper part of the static pressure piston is located at the lower side of the upper joint, and the lower part of the static pressure piston is sealed inside the static pressure joint, and the upper end of the cannula core shaft is sealed inside the lower end of the static pressure joint;

[0007] A switch cannula is arranged inside the cannula core shaft, and the sealing sleeve of the lower outer wall of the cannula core shaft is provided with the return joint, the sealing sleeve on the lower outer wall of the return joint is provided with an intermediate joint, the sealing sleeve on the lower inner wall of the return joint is provided with a pawl, the lower part of the pawl is located inside the intermediate joint, the valve core assembly is arranged inside the intermediate joint, the upper part of the connecting joint is located inside the intermediate joint and abuts against the valve core assembly, and the sealing sleeve on the lower outer wall of the connecting joint is provided with the lower joint;

[0008] The valve core assembly includes a ball cage, a short valve seat, a ball valve core and a long valve seat. The upper end of the pawl is sleeved on the outer side wall of the lower end of the switch insert, and the upper end of the ball cage is sleeved inside the lower end of the pawl. The short valve seat and the ball valve core are respectively installed inside the ball cage. The short valve seat is located above the ball valve core, and the lower end of the short valve seat abuts against the outer side wall of the ball valve core. The inner side wall of the upper end of the connecting joint is concave to form a first fixed cavity. The long valve seat is sealingly arranged in the first fixed cavity, and the upper end of the long valve seat abuts against the outer side wall of the ball valve core.

[0009] The ball valve core includes a valve core body, a through hole is arranged inside the valve core body, and the outer wall of the valve core body is concave to form a first positioning hole and a second positioning hole. The angle between the central axis of the first positioning hole and the central axis of the second positioning hole is 120°, and the first positioning hole and the second positioning hole are respectively connected to the through hole.

[0010] The upper joint has an upper joint cavity inside, and a plurality of limiting grooves are evenly arranged on the upper part of the outer wall of the upper joint along the circumferential direction, and a first connecting part is extended downward from the lower end of the upper joint, wherein:

[0011] The upper joint cavity passes through the first connecting portion, and the outer diameter of the first connecting portion is smaller than the outer diameter of the upper joint;

[0012] The first connection part is sealed inside the upper end of the static pressure joint, and a plurality of first fastening holes are evenly penetrated through the lower end of the outer wall of the first connection part along the circumferential direction, and a full-length tapered groove pin is arranged in the first fastening hole.

[0013] The outer side wall of the first connecting portion is concavely formed with a first sealing groove and a second sealing groove along the circumferential direction, wherein:

[0014] The first sealing groove is located above the second sealing groove, a first O-ring and two first sealing back rings are arranged in the first sealing groove, and the two first sealing back rings are respectively located on both sides of the first O-ring;

[0015] The second sealing groove is located above the first fastening hole. A second O-ring and two second sealing back rings are arranged in the second sealing groove, and the two second sealing back rings are respectively located on both sides of the second O-ring.

[0016] It also includes two operating handles, both of which are arranged inside the middle joint, wherein:

[0017] The operating handle comprises an operating handle body, the cross sections of the outer side wall and the inner side wall of the operating handle body are both arc-shaped, the upper end of the inner side wall of the operating handle body is provided with a first positioning convex portion and a second positioning convex portion, and the first positioning convex portion is located above the second positioning convex portion;

[0018] The side surface of the end of the first positioning protrusion away from the operating handle body is an arc surface, the side surface of the end of the second positioning protrusion away from the operating handle body is an arc surface, and a positioning recess is formed between the first positioning protrusion and the second positioning protrusion;

[0019] A mounting portion is fixedly provided at the lower end of the inner side wall of the operating handle body, and the mounting portion is in the shape of a sphere. One mounting portion of the operating handle is installed in the first positioning hole, and the mounting portion of the other operating handle is installed in the second positioning hole.

[0020] The upper end of the outer wall of the static pressure piston is concave inwardly along the circumferential direction to form a third sealing groove, in which a third O-ring and two third sealing back rings are arranged, and the two third sealing back rings are respectively located on both sides of the third O-ring;

[0021] The outer side wall of the static pressure piston is concave inwardly formed with a first fixing groove along the circumferential direction, and when the upper end of the static pressure piston is sealed and arranged inside the upper joint, one end of the full-length tapered groove pin is located in the first fastening hole, and the other end of the full-length tapered groove pin is located in the first fixing groove;

[0022] The lower end of the outer wall of the static pressure piston is concave inwardly along the circumferential direction to form a fourth sealing groove, in which a fourth O-ring and two fourth sealing back rings are arranged, and the two fourth sealing back rings are respectively located on both sides of the fourth O-ring.

[0023] The inner side wall of the upper end of the static pressure joint is concave to form a second fixed cavity, and the first connecting part is sealed and arranged inside the second fixed cavity;

[0024] The inner side wall of the lower end of the static pressure joint is concave to form a third fixed cavity, and the upper end of the cannula core shaft is sealed and arranged inside the third fixed cavity;

[0025] The inner side wall of the third fixed cavity is concavely formed with a sixth sealing groove and a seventh sealing groove along the circumferential direction, the sixth sealing groove is located above the seventh sealing groove, a sixth O-ring and two sixth sealing back rings are arranged in the sixth sealing groove, and the two sixth sealing back rings are respectively located on both sides of the sixth O-ring;

[0026] A seventh O-ring and two seventh sealing back rings are arranged in the seventh sealing groove, and the two seventh sealing back rings are respectively located on both sides of the seventh O-ring.

[0027] The lower end of the static pressure piston is extended downward to be provided with a second connection portion, and the static pressure piston has a static pressure piston cavity inside, and the static pressure piston cavity runs through the second connection portion, wherein:

[0028] The lower portion of the outer wall of the second connecting portion is concave inwardly along the circumferential direction to form a fifth sealing groove, in which a fifth O-ring and two fifth sealing back rings are arranged, and the two fifth sealing back rings are respectively located on both sides of the fifth O-ring;

[0029] The inner side wall at the lower end of the second connecting part is concave to form a fourth fixing cavity, the upper end of the switch insert is arranged inside the fourth fixing cavity, and a second fastening hole is penetrated through the side wall of the second connecting part, and a fastening pin is arranged in the second fastening hole.

[0030] The inner side wall of the upper end of the tie-back joint is concave to form a fifth fixed cavity, the lower end of the cannula core shaft is arranged inside the fifth fixed cavity, the lower end of the cannula core shaft is connected to a guide shoe, and the guide shoe is located at the bottom of the fifth fixed cavity;

[0031] The lower end of the tie-back joint is extended downward to form a third connection portion, the tie-back joint has a tie-back joint cavity, the tie-back joint cavity passes through the third connection portion, and the third connection portion is sealed and arranged inside the upper end of the intermediate joint;

[0032] The cannula core shaft has a cannula core shaft cavity inside, the cannula core shaft cavity is connected with the guide shoe cavity, and the switch cannula is located in the cannula core shaft cavity, the guide shoe cavity and the tie-back joint;

[0033] The lower end of the switch insert is extended downward to form a fourth connection portion, the switch insert cavity passes through the fourth connection portion, and the upper end of the outer wall of the fourth connection portion is provided with a clamping groove along the circumferential direction.

[0034] The third connecting portion is provided with an eighth sealing groove and a ninth sealing groove, the eighth sealing groove is provided with an eighth O-ring and two eighth sealing back rings, and the two eighth sealing back rings are respectively located on both sides of the eighth O-ring;

[0035] A ninth O-ring and two ninth sealing back rings are arranged in the ninth sealing groove, and the two ninth sealing back rings are respectively located on both sides of the ninth O-ring.

[0036] The pawl comprises a pawl body, the pawl body has a pawl cavity, a fifth connecting portion is provided at the upper end of the pawl body extending upward, the pawl cavity passes through the fifth connecting portion, the fifth connecting portion is sealed inside the third connecting portion, and the fifth connecting portion is sleeved on the fourth connecting portion;

[0037] The outer side wall of the fifth connecting part is evenly provided with a plurality of long strip through holes along the circumferential direction, and the long strip through holes extend to the upper end side surface of the fifth connecting part, and the upper end of the inner side wall of the fifth connecting part is provided with a clamping protrusion along the circumferential direction, and when the fifth connecting part is sleeved on the fourth connecting part, the clamping protrusion is clamped in the clamping groove;

[0038] The lower end of the outer wall of the pawl body is concave inwardly along the circumferential direction to form a positioning groove, and the first positioning protrusions on the two operating handles are both clamped in the positioning groove;

[0039] The outer side wall of the pawl body is concave inwardly along the circumferential direction to form a tenth sealing groove, a tenth sealing back ring is arranged in the tenth sealing groove, and the inner side wall of the lower end of the pawl body is concave inwardly to form a sixth fixing cavity.

[0040] The ball cage comprises a ball cage body, the ball cage body has a ball cage cavity inside, and the ball valve core is arranged in the ball cage cavity;

[0041] A sixth connection part is fixedly provided at the upper end of the ball cage body, the outer diameter of the sixth connection part is smaller than the outer diameter of the ball cage body, the lower end of the sixth connection part extends to the inside of the ball cage cavity, the sixth connection part has a connection through hole inside, the inner diameter of the connection through hole is smaller than the inner diameter of the ball cage cavity, and the connection through hole is connected to the ball cage cavity;

[0042] The outer side wall of the ball cage body is concavely formed with a first mounting through hole and a second mounting through hole, the first mounting through hole and the second mounting through hole both extend to the upper end side wall of the ball cage body, and the first mounting through hole and the second mounting through hole are both connected to the ball cage cavity;

[0043] When the mounting parts on the two operating handles are respectively arranged in the first positioning hole and the second positioning hole, one of the operating handle bodies is located in the first mounting through hole, and the other operating handle body is located in the second mounting through hole, and at the same time, the first positioning protrusions on the two operating handles are both located in the positioning grooves.

[0044] The upper side wall of the ball cage cavity in the ball cage body is provided with a first installation cavity extending upward along the circumferential direction, wherein:

[0045] The inner diameter of the first installation cavity is smaller than the inner diameter of the ball cage cavity, the short valve seat is arranged in the first installation cavity, the lower end of the short valve seat abuts against the outer side wall of the ball valve core, and a disc spring is also arranged in the first installation cavity, and the disc spring is located above the short valve seat;

[0046] A seventh connection portion is extended upwardly from the upper end of the connection joint, the inner side wall of the upper end of the seventh connection portion is concave to form the first fixing cavity, the inner side wall of the first fixing cavity is concave to form an eleventh sealing groove and a twelfth sealing groove, and the eleventh sealing groove is located above the twelfth sealing groove;

[0047] The eleventh sealing groove is provided with an eleventh O-ring and two eleventh sealing back rings, and the two eleventh sealing back rings are respectively located on both sides of the eleventh O-ring; the twelfth sealing groove is provided with a twelfth O-ring and two twelfth sealing back rings, and the two twelfth sealing back rings are respectively located on both sides of the twelfth O-ring.

[0048] The middle part of the outer side wall of the connecting joint is concavely formed with a thirteenth sealing groove and a fourteenth sealing groove along the circumferential direction, and the thirteenth sealing groove is located above the fourteenth sealing groove, wherein:

[0049] A thirteenth O-ring and two thirteenth sealing back rings are arranged in the thirteenth sealing groove, and the two thirteenth sealing back rings are respectively located on both sides of the thirteenth O-ring; a fourteenth O-ring and two fourteenth sealing back rings are arranged in the fourteenth sealing groove, and the two fourteenth sealing back rings are respectively located on both sides of the fourteenth O-ring.

[0050] The inner side wall of the upper end of the lower joint is concave to form a seventh fixed cavity, and the lower end of the connecting joint is sealed and arranged in the seventh fixed cavity; the lower end of the outer side wall of the connecting joint is concave in the circumferential direction to form a fifteenth sealing groove and a sixteenth sealing groove, and the fifteenth sealing groove is located above the sixteenth sealing groove, wherein:

[0051] The fifteenth O-ring and two fifteenth sealing back rings are arranged in the fifteenth sealing groove, and the two fifteenth sealing back rings are respectively located on both sides of the fifteenth O-ring; the sixteenth O-ring and two sixteenth sealing back rings are arranged in the sixteenth sealing groove, and the two sixteenth sealing back rings are respectively located on both sides of the sixteenth O-ring.

[0052] The present invention has the following advantages and beneficial effects: the high-temperature and high-pressure gas-tight APIB isolation valve provided by the embodiment of the present invention is a tool for closing the upper and lower channels of the pipe string through hydrostatic pressure, and is suitable for multi-layer testing operations; at the same time, it is also suitable for high-temperature and high-pressure wells or geothermal wells; when it is necessary to close, the rupture disk is ruptured by pressurizing the annulus, and the annulus pressure enters the piston cavity (that is, the cavity between the inner wall of the hydrostatic joint and the outer wall of the hydrostatic piston), so that the hydrostatic piston moves upward, thereby driving the cannula core shaft, the switch cannula, the ratchet and the ball cage to move upward, and then the ball valve core is moved through the operating handle. 90° flipping movement, that is, the ball valve core is in a closed state, thereby closing the upper and lower passages of the tubing string and realizing related operations such as well drilling without well pressure relief; when it is necessary to open the upper and lower passages of the tubing string, after the connection switch tool is lowered into place, a certain annular space pressure is applied to rupture the rupture disk, and the annular space pressure enters the piston cavity, causing the static pressure piston to move downward, thereby driving the cannula core shaft, the switch cannula, the ratchet and the ball cage to move downward, and then the ball valve core is flipped 90° through the operating handle, that is, the ball valve core is in an open state, thereby opening the upper and lower passages of the tubing string, which is easy to operate and safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic cross-sectional structure diagram of a high-temperature and high-pressure gas-tight APIB isolation valve provided in an embodiment of the present invention.

[0054] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at position A in the middle.

[0055] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at position B in the figure.

[0056] Figure 4 for Figure 1 Schematic diagram of the enlarged structure at position C in the middle.

[0057] Figure 5 This is an enlarged three-dimensional structural schematic diagram of the upper joint provided in an embodiment of the present invention.

[0058] Figure 6 This is a schematic diagram of an enlarged cross-sectional structure of an upper joint provided in an embodiment of the present invention.

[0059] Figure 7 A schematic cross-sectional view of the ball valve core in an open state provided in an embodiment of the present invention.

[0060] Figure 8 A schematic cross-sectional view of the ball valve core in a closed state provided in an embodiment of the present invention.

[0061] Fig. 9 An enlarged cross-sectional structural schematic diagram of a static pressure joint provided in an embodiment of the present invention.

[0062] Fig.10 An enlarged three-dimensional structural schematic diagram of a static pressure piston provided in an embodiment of the present invention.

[0063] Fig.11 This is a schematic diagram of an enlarged cross-sectional structure of a static pressure piston provided in an embodiment of the present invention.

[0064] Fig.12 An enlarged three-dimensional structural schematic diagram of a tieback joint provided in an embodiment of the present invention.

[0065] Fig.13 An enlarged cross-sectional structural schematic diagram of a tieback joint provided in an embodiment of the present invention.

[0066] Fig.14 This is an enlarged three-dimensional structural schematic diagram of a switch insert provided in an embodiment of the present invention.

[0067] Fig.15 This is a schematic diagram of an enlarged cross-sectional structure of a switch insert provided in an embodiment of the present invention.

[0068] Fig.16 This is an enlarged three-dimensional structural schematic diagram of an intermediate joint provided in an embodiment of the present invention.

[0069] Fig.17 This is a schematic diagram of an enlarged cross-sectional structure of an intermediate joint provided in an embodiment of the present invention.

[0070] Fig.18 This is an enlarged three-dimensional structural schematic diagram of the cannula core shaft provided in an embodiment of the present invention.

[0071] Fig.19 This is a schematic diagram of an enlarged cross-sectional structure of a cannula core shaft provided in an embodiment of the present invention.

[0072] Fig. 20 An enlarged three-dimensional structural schematic diagram of a pawl provided in an embodiment of the present invention.

[0073] Fig.21 This is a schematic diagram of an enlarged cross-sectional structure of a pawl provided in an embodiment of the present invention.

[0074] Fig. 22 This is an enlarged three-dimensional structural schematic diagram of a ball cage provided in an embodiment of the present invention.

[0075] Fig.23 This is a schematic diagram of an enlarged cross-sectional structure of a ball cage provided in an embodiment of the present invention.

[0076] Fig.24 This is an enlarged front structural schematic diagram of a ball valve core provided in an embodiment of the present invention.

[0077] Fig.25This is a schematic diagram of an enlarged cross-sectional structure of a ball valve core provided in an embodiment of the present invention.

[0078] Fig.26 This is an enlarged three-dimensional structural schematic diagram of an operating handle provided by an embodiment of the present invention.

[0079] Fig. 27 This is a schematic diagram of an enlarged cross-sectional structure of an operating handle provided in an embodiment of the present invention.

[0080] Fig.28 An enlarged three-dimensional structural schematic diagram of a disc spring provided in an embodiment of the present invention.

[0081] Fig.29 This is a schematic diagram of an enlarged three-dimensional structure of a short valve seat provided in an embodiment of the present invention.

[0082] Fig.30 This is a schematic diagram of an enlarged three-dimensional structure of a long valve seat provided in an embodiment of the present invention.

[0083] Fig.31 An enlarged three-dimensional structural schematic diagram of a connecting joint provided in an embodiment of the present invention.

[0084] Fig.32 This is a schematic diagram of an enlarged cross-sectional structure of a connecting joint provided in an embodiment of the present invention.

[0085] Fig.33 This is an enlarged three-dimensional structural schematic diagram of the lower joint provided in an embodiment of the present invention.

[0086] Fig.34 This is a schematic diagram of an enlarged cross-sectional structure of a lower joint provided in an embodiment of the present invention.

[0087] The markings in the figure are as follows: 1. upper joint; 101. first connecting part; 102. limiting groove; 103. first sealing groove; 104. second sealing groove; 105. first fastening hole; 106. first sealing back ring; 107. second O-ring; 108. second sealing back ring; 109. first O-ring; 111. upper joint cavity; 6. full-length taper groove pin; 7. static pressure joint; 701. second fixed cavity; 702. third fixed cavity; 703. sixth sealing groove; 704. seventh sealing groove; 705. threaded hole; 706. static pressure joint cavity; 8. static pressure piston; 801. third Sealing groove; 802, first fixing groove; 803, fourth sealing groove; 804, second connecting part; 805, static pressure piston cavity; 806, fifth sealing groove; 807, fourth fixing cavity; 808, second fastening hole; 809, fixing pin; 15, insert mandrel; 24, guide shoe; 242, inclined part; 25, tie-back joint; 251, fifth fixing cavity; 252, third connecting part; 253, tie-back joint cavity; 254, eighth sealing groove; 255, ninth sealing groove; 26, switch insert; 261, fourth connecting part; 262, switch insert cavity; 29, middle Joint; 31, ratchet; 310, ratchet body; 311, ratchet cavity; 312, fifth connecting part; 313, long strip through hole; 314, clamping convex part; 315, positioning groove; 316, tenth sealing groove; 317, sixth fixing cavity; 33, ball cage; 330, ball cage body; 331, ball cage cavity; 332, sixth connecting part; 333, connecting through hole; 334, first mounting through hole; 335, second mounting through hole; 336, first mounting cavity; 337, seventeenth sealing groove; 34, disc spring; 35, short valve seat; 36, ball valve core; 360, valve core body; 361 , first positioning hole; 362, second positioning hole; 363, through hole; 37, operating handle; 370, operating handle body; 371, first positioning protrusion; 372, second positioning protrusion; 373, positioning recess; 374, mounting portion; 38, long valve seat; 41, connecting joint; 410, seventh connecting portion; 411, first fixed cavity; 412, eleventh sealing groove; 413, twelfth sealing groove; 414, thirteenth sealing groove; 415, fourteenth sealing groove; 416, fifteenth sealing groove; 417, sixteenth sealing groove; 42, lower joint; 421, seventh fixed cavity. DETAILED DESCRIPTION

[0088] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0089] like Figures 1 to 34As shown: a high-temperature and high-pressure gas-tight APIB isolation valve provided by an embodiment of the present invention includes an upper joint 1, a static pressure joint 7, a static pressure piston 8, a cannula core shaft 15, a switch cannula 26, a tie-back joint 25, an intermediate joint 29, a valve core assembly, a connecting joint 41 and a lower joint 42, wherein:

[0090] The lower end of the upper joint 1 is sealed inside the upper end of the static pressure joint 7, the upper part of the static pressure piston 8 is located at the lower side of the upper joint 1, and the lower part of the static pressure piston 8 is sealed inside the static pressure joint 7, and the upper end of the cannula core shaft 15 is sealed inside the lower end of the static pressure joint 7;

[0091] A switch insert tube 26 is arranged inside the insert tube core shaft 15, and a return joint 25 is arranged on the sealing sleeve of the lower outer wall of the insert tube core shaft 15, and an intermediate joint 29 is arranged on the sealing sleeve of the lower outer wall of the return joint 25, and a ratchet 31 is arranged on the sealing sleeve of the lower inner wall of the return joint 25, and the lower part of the ratchet 31 is located inside the intermediate joint, and the valve core assembly is arranged inside the intermediate joint, and the upper part of the connecting joint 41 is located inside the intermediate joint 29 and abuts against the valve core assembly, and a lower joint 42 is arranged on the sealing sleeve of the lower outer wall of the connecting joint 41;

[0092] The valve core assembly includes a ball cage 33, a short valve seat 35, a ball valve core 36 and a long valve seat 38. The upper end of the ratchet 31 is sleeved on the outer side wall of the lower end of the switch insert 26, the upper end of the ball cage 33 is sleeved inside the lower end of the ratchet 31, the short valve seat 35 and the ball valve core 36 are respectively installed inside the ball cage 33, the short valve seat 35 is located above the ball valve core 36, and the lower end of the short valve seat 35 abuts against the outer side wall of the ball valve core 36; the inner side wall of the upper end of the connecting joint 41 is concave to form a first fixed cavity 411, the long valve seat 38 is sealed in the first fixed cavity 411, and the upper end of the long valve seat 38 abuts against the outer side wall of the ball valve core 36;

[0093] The ball valve core 36 includes a valve core body 360, and a through hole 363 is arranged inside the valve core body 360. The outer wall of the valve core body 360 is concave to form a first positioning hole 361 and a second positioning hole 362. The angle between the central axis of the first positioning hole 361 and the central axis of the second positioning hole 362 is 120°, and the first positioning hole 361 and the second positioning hole 362 are respectively connected to the through hole 363.

[0094] The upper joint 1 has an upper joint cavity 111 inside, and a plurality of limiting grooves 102 are evenly arranged on the upper part of the outer wall of the upper joint 1 in the circumferential direction, and a first connecting part 101 is extended downward from the lower end of the upper joint 1, that is, the first connecting part 101 and the upper joint 1 are integrally formed, thereby facilitating early processing and increasing the firmness of the combination of the first connecting part 101 and the upper joint 1; wherein: the upper joint cavity 111 passes through the first connecting part 101, and the outer diameter of the first connecting part 101 is smaller than the outer diameter of the upper joint 1; the first connecting part 101 is sealed inside the upper end of the static pressure joint 7, and a plurality of first fastening holes 105 are evenly arranged on the lower end of the outer wall of the first connecting part 101 in the circumferential direction, and a full-length tapered groove pin 6 is arranged in the first fastening hole 105.

[0095] A first sealing groove 103 and a second sealing groove 104 are formed inwardly along the circumferential direction on the outer side wall of the first connecting portion 101, wherein: the first sealing groove 103 is located above the second sealing groove 104, a first O-ring 109 and two first sealing back rings 106 are arranged in the first sealing groove 103, and the two first sealing back rings 106 are respectively arranged on both sides of the first O-ring 109; the second sealing groove 104 is located above the first fastening hole 105, a second O-ring 107 and two second sealing back rings 108 are arranged in the second sealing groove 104, and the two second sealing back rings 108 are respectively arranged on both sides of the second O-ring 107. Through the above design, that is, the first sealing groove 103 and the second sealing groove 104 are arranged along the circumferential direction on the outer side wall of the first connecting part 101, the first O-ring 109 and two first sealing back rings 106 are arranged in the first sealing groove 103, and at the same time, the second O-ring 107 and two second sealing back rings 108 are arranged in the second sealing groove 104, so that the sealing performance of the upper joint 1 combined with the static pressure joint 7 can be improved.

[0096] A high-temperature and high-pressure gas-tight APIB isolation valve provided in an embodiment of the present invention also includes two operating handles 37, both of which are arranged inside the intermediate joint 29, wherein: the operating handle 37 includes an operating handle body 370, the cross-sections of the outer side wall and the inner side wall of the operating handle body 370 are both arc-shaped, and the upper end of the inner side wall of the operating handle body 370 is provided with a first positioning protrusion 371 and a second positioning protrusion 372, the first positioning protrusion 371 is located above the second positioning protrusion 372; the first positioning protrusion 371 is away from the operating handle body 370, and the second positioning protrusion 372 ... The side surface where the end of the operating handle body 370 is located is an arc surface, the side surface where the end of the second positioning protrusion 372 away from the operating handle body 370 is located is an arc surface, and a positioning recess 373 is formed between the first positioning protrusion 371 and the second positioning protrusion 372; the lower end of the inner side wall of the operating handle body 370 is fixedly provided with a mounting portion 374, and the mounting portion 374 is in the shape of a sphere, and the mounting portion of one operating handle 37 is mounted in the first positioning hole 361, and the mounting portion 374 of the other operating handle 37 is mounted in the second positioning hole 362. At the same time, since the first positioning protrusion 371 and the second positioning protrusion 372 are integrally formed with the operating handle body 370, the firmness of the combination of the first positioning protrusion 371 and the second positioning protrusion 372 with the operating handle body 370 can be increased, that is, the strength of the operating handle 37 is increased, and the safety and reliability are improved.

[0097] The upper end of the outer wall of the static pressure piston 8 is concave inward along the circumferential direction to form a third sealing groove 801, in which a third O-ring and two third sealing back rings are arranged, and the two third sealing back rings are respectively located on both sides of the third O-ring; the outer wall of the static pressure piston 8 is concave inward along the circumferential direction to form a first fixing groove 802, when the upper end of the static pressure piston 8 is sealed and arranged inside the upper joint 1, one end of the full-length tapered groove pin 6 is located in the first fastening hole 105, and the other end of the full-length tapered groove pin 6 is located in the first fixing groove 802; the lower end of the outer wall of the static pressure piston 8 is concave inward along the circumferential direction to form a fourth sealing groove 803, in which a fourth O-ring and two fourth sealing back rings are arranged, and the two fourth sealing back rings are respectively located on both sides of the fourth O-ring. Through the above design, that is, multiple first fastening holes 105 are arranged along the circumferential direction on the side wall of the first connecting part 101 at the lower end of the upper joint 1, and a full-length tapered groove pin 6 is arranged in the first fastening hole 105, and at the same time, a first fixing groove 802 is arranged along the circumferential direction on the outer side wall of the static pressure piston 8, and the two ends of the full-length tapered groove pin 6 are respectively located in the first fastening hole 105 and the first fixing groove 802, so that the firmness of the combination of the upper joint 1 and the static pressure piston 8 can be increased by setting multiple full-length tapered groove pins 6, and the safety and reliability are improved. At the same time, by setting a third sealing groove 801 at the upper end of the outer side wall of the static pressure piston 8, and installing a third O-ring and two third sealing back rings in the third sealing groove 801, the sealing performance of the static pressure piston 8 and the upper joint 1 can be improved.

[0098] The inner wall of the upper end of the static pressure joint 7 is concave to form a second fixed cavity 701, and the first connecting part 101 is sealed inside the second fixed cavity 701; the inner wall of the lower end of the static pressure joint 7 is concave to form a third fixed cavity 702, and the upper end of the insert core shaft 15 is sealed inside the third fixed cavity 702; the inner wall of the third fixed cavity 702 is concave in the circumferential direction to form a sixth sealing groove 703 and a seventh sealing groove 704, the sixth sealing groove 703 is located above the seventh sealing groove 704, a sixth O-ring and two sixth sealing back rings are arranged in the sixth sealing groove 703, and the two sixth sealing back rings are respectively located on both sides of the sixth O-ring; a seventh O-ring and two seventh sealing back rings are arranged in the seventh sealing groove 704, and the two seventh sealing back rings are respectively located on both sides of the seventh O-ring. Through the above design, the inner wall of the third fixed cavity 702 is concave inwardly along the circumferential direction to form a sixth sealing groove 703 and a seventh sealing groove 704, the sixth sealing groove 703 is provided with a sixth O-ring and two sixth sealing back rings, and the seventh sealing groove 704 is provided with a seventh O-ring and two seventh sealing back rings, thereby improving the sealing performance of the upper end of the cannula core shaft 15 and the inner wall of the lower end of the static pressure joint 7.

[0099] At the same time, the static pressure joint 7 has a static pressure joint cavity 706 inside, and a threaded hole 705 is provided on the side wall of the static pressure joint 7, and the threaded hole 705 is connected with the static pressure joint cavity 706, and the threaded hole 705 is used to install a rupture disk. The rupture disk is made of metal material, and when the pressure difference between the inside and outside of the rupture disk exceeds 15MPa, the rupture disk opens, and the pressure enters the static pressure joint cavity 706 through the rupture disk.

[0100] The lower end of the static piston 8 extends downward to form a second connection part 804, and the static piston 8 has a static piston cavity 805 inside. The static piston cavity 805 penetrates the second connection part 804, wherein: the lower part of the outer wall of the second connection part 804 is concave in the circumferential direction to form a fifth sealing groove 806, and the fifth sealing groove 806 is provided with a fifth O-ring and two fifth sealing back rings, and the two fifth sealing back rings are respectively located on both sides of the fifth O-ring; the inner side wall of the lower end of the second connection part 804 is concave to form a fourth fixing cavity 807, and the upper end of the switch insert 26 is arranged inside the fourth fixing cavity 807, and the side wall of the second connection part 804 is penetrated by a second fastening hole 808, and the second fastening pin 809 is arranged in the second fastening hole 808. Through the above design, that is, the second connection part 804 and the static piston 8 are integrally formed, the firmness of the combination of the second connection part 804 and the static piston 8 can be increased, the safety and reliability are improved, and the purpose of extending the service life is achieved. At the same time, by providing a fifth sealing groove 806 on the outer side wall of the second connecting portion 804, and providing a fifth O-ring and two fifth sealing back rings in the fifth sealing groove 806, the sealing performance of the second connecting portion 804 combined with the static pressure joint 7 can be improved.

[0101] The inner side wall of the upper end of the return joint 25 is concave to form a fifth fixed cavity 251, and the lower end of the cannula core shaft 15 is arranged inside the fifth fixed cavity 251. The lower end of the cannula core shaft 15 is threadedly connected with a guide shoe 24, and the guide shoe 24 is located at the bottom of the fifth fixed cavity 251, and the lower end side wall of the guide shoe 24 has an inclined portion 242. By arranging the guide shoe 24 at the lower end of the cannula core shaft 15, it plays a guiding role when the cannula core shaft 15 moves downward. At the same time, when it moves downward into place, the bottom end of the guide shoe 24 abuts against the bottom end of the fifth fixed cavity 251, that is, it plays a limiting role; the lower end of the return joint 25 is extended downward to be provided with a third connecting portion 252, that is, the third connecting portion 252 and the return joint 25 are integrally formed, which can increase the firmness of the combination of the third connecting portion 252 and the return joint 25; the return joint 2 The intermediate joint 29 has a connecting joint cavity 253, which penetrates the third connecting portion 252, and the third connecting portion 252 is sealed inside the upper end of the intermediate joint 29; the inserting pipe core shaft 15 has an inserting pipe core shaft cavity 151 inside, which is communicated with the guide shoe cavity 241, and the switch inserting pipe 26 is located in the inserting pipe core shaft cavity 151, the guide shoe cavity 241 and the connecting joint 25; the lower end of the switch inserting pipe 26 is extended downward to be provided with a fourth connecting portion 261, that is, the fourth connecting portion 261 and the switch inserting pipe 26 are integrally formed, which can increase the firmness of the combination of the fourth connecting portion 261 and the switch inserting pipe 26; the switch inserting pipe 26 has a switch inserting pipe cavity 262 inside, which penetrates the fourth connecting portion 261, and the upper end of the outer wall of the fourth connecting portion 261 is provided with a clamping groove 263 along the circumferential direction. At the same time, a sealing assembly is sleeved on the outer side wall of the return joint cavity 253 on the return joint 25 where the lower end of the cannula core shaft 15 is located. The sealing assembly may include V-shaped packing 18 that are snap-fitted to each other. When the lower end of the cannula core shaft 15 moves upward and downward in the return joint cavity 253, a good seal is formed between the cannula core shaft 15 and the return joint 25 to improve the sealing performance.

[0102] The third connection part 252 is provided with an eighth sealing groove 254 and a ninth sealing groove 255. The eighth sealing groove 254 is located above the ninth sealing groove 255. The eighth O-ring and two eighth sealing back rings are provided in the eighth sealing groove 254, and the two eighth sealing back rings are respectively located on both sides of the eighth O-ring; the ninth sealing groove 255 is provided with a ninth O-ring and two ninth sealing back rings, and the two ninth sealing back rings are respectively located on both sides of the ninth O-ring. Through the above design, that is, the eighth sealing groove 254 and the ninth sealing groove 255 are provided on the outer wall of the third connection part 252, and the eighth O-ring and two eighth sealing back rings are provided in the eighth sealing groove 254, and the ninth O-ring and two ninth sealing back rings are provided in the ninth sealing groove 255, so that the sealing performance of the third connection part 252 combined with the intermediate joint 29 can be improved.

[0103] The pawl 31 includes a pawl body 310, the pawl body 310 has a pawl cavity 311 inside, and the upper end of the pawl body 310 is extended upward to be provided with a fifth connecting portion 312, that is, the fifth connecting portion 312 and the pawl body 310 are integrally formed, which can increase the firmness of the combination of the fifth connecting portion 312 and the pawl body 310; the pawl cavity 311 passes through the fifth connecting portion 312, the fifth connecting portion 312 is sealed inside the third connecting portion 252, and the fifth connecting portion 312 is sleeved on the fourth connecting portion 261; the outer wall of the fifth connecting portion 312 is evenly provided with a plurality of elongated through holes 313 along the circumferential direction, and the elongated through holes 313 extend to the fifth connecting portion On the upper side surface of the part 312, a clamping protrusion 314 is provided at the upper end of the inner wall of the fifth connecting part 312 along the circumferential direction. When the fifth connecting part 312 is sleeved on the fourth connecting part 261, the clamping protrusion 314 is clamped in the clamping groove 263; the lower end of the outer wall of the pawl body 310 is concave inwardly along the circumferential direction to form a positioning groove 315, and the first positioning protrusions 371 on the two operating handles 37 are both clamped in the positioning groove 315; the outer wall of the pawl body 310 is concave inwardly along the circumferential direction to form a tenth sealing groove 316, and the tenth sealing back ring is provided in the tenth sealing groove 316, and the inner wall of the lower end of the pawl body 310 is concave to form a sixth fixed cavity 317. Through the above design, that is, a tenth sealing groove 316 is provided on the outer wall of the pawl body 310, and a tenth sealing back ring is provided in the tenth sealing groove 316, so that the sealing performance of the combination of the pawl body 310 and the third connecting part 252 can be improved, that is, the sealing performance of the combination of the pawl 31 and the return joint 25 can be improved.

[0104] The ball cage 33 includes a ball cage body 330, which has a ball cage cavity 331 inside, and the ball valve core 36 is arranged in the ball cage cavity 331; a sixth connecting part 332 is fixedly arranged on the upper end of the ball cage body 330, that is, the ball cage body 330 and the sixth connecting part 332 are integrally formed, which can increase the firmness of the combination of the ball cage body 330 and the sixth connecting part 332; the outer diameter of the sixth connecting part 332 is smaller than the outer diameter of the ball cage body 330, and the lower end of the sixth connecting part 332 extends to the inside of the ball cage cavity 331, and the sixth connecting part 332 has a connecting through hole 333 inside, the inner diameter of the connecting through hole 333 is smaller than the inner diameter of the ball cage cavity 331, and the connecting through hole 333 is connected to the ball cage cavity 331; the upper end of the outer wall of the sixth connecting part 332 is concave inwardly along the circumferential direction to form a seventeenth sealing groove 337, and a seventeenth sealing back ring is arranged in the seventeenth sealing groove 337. Through the above design, that is, the seventeenth sealing groove 337 is provided on the sixth connecting portion 332 , and the seventeenth sealing back ring is provided in the seventeenth sealing groove 337 , the sealing performance of the sixth connecting portion 332 and the pawl 31 can be improved.

[0105] The outer side wall of the ball cage body 330 is concavely formed with a first mounting through hole 334 and a second mounting through hole 335, both of which extend to the upper end side wall of the ball cage body 330, and both of which are connected to the ball cage cavity 331; when the mounting portions 374 on the two operating handles 37 are respectively arranged in the first positioning hole 361 and the second positioning hole 362, one of the operating handle bodies 370 is located in the first mounting through hole 334, and the other operating handle body 370 is located in the second mounting through hole 335, and at the same time, the first positioning protrusions 371 on the two operating handles 37 are both located in the positioning groove 315.

[0106] The upper side wall of the ball cage cavity 331 in the ball cage body 330 is provided with a first installation cavity 336 extending upward along the circumferential direction, wherein: the inner diameter of the first installation cavity 336 is smaller than the inner diameter of the ball cage cavity 331, the short valve seat 35 is arranged in the first installation cavity 336, the lower end of the short valve seat 35 abuts against the outer side wall of the ball valve core 36, and the first installation cavity 336 is also provided with a disc spring 34, and the disc spring 34 is located above the short valve seat 35; the upper end of the connecting joint 41 is provided with a seventh connecting portion 410 extending upward, that is, the seventh connecting portion 410 and the connecting joint 41 are integrally formed, which can increase the firmness of the seventh connecting portion 410 combined with the connecting joint 41; the seventh connecting portion The inner side wall of the upper end of 410 is concave to form a first fixed cavity 411, and the long valve seat 38 is sealed in the first fixed cavity 411. The inner side wall of the first fixed cavity 411 is concave to form an eleventh sealing groove 412 and a twelfth sealing groove 413, and the eleventh sealing groove 412 is located above the twelfth sealing groove 413; the eleventh O-ring and two eleventh sealing back rings are arranged in the eleventh sealing groove 412, and the two eleventh sealing back rings are respectively located on both sides of the eleventh O-ring; the twelfth O-ring and two twelfth sealing back rings are arranged in the twelfth sealing groove 413, and the two twelfth sealing back rings are respectively located on both sides of the twelfth O-ring. Through the above design, that is, the eleventh sealing groove 412 and the twelfth sealing groove 413 are arranged on the inner wall of the first fixed cavity 411, the eleventh O-ring and two eleventh sealing back rings are arranged in the eleventh sealing groove 412, and the twelfth O-ring and two twelfth sealing back rings are arranged in the twelfth sealing groove 413, so that the sealing performance of the seventh connecting part 410 combined with the long valve seat 38 can be improved.

[0107] The middle part of the outer wall of the connecting joint 41 is concavely formed with a thirteenth sealing groove 414 and a fourteenth sealing groove 415 along the circumferential direction, and the thirteenth sealing groove 414 is located above the fourteenth sealing groove 415, wherein: a thirteenth O-ring and two thirteenth sealing back rings are arranged in the thirteenth sealing groove 414, and the two thirteenth sealing back rings are respectively arranged on both sides of the thirteenth O-ring; a fourteenth O-ring and two fourteenth sealing back rings are arranged in the fourteenth sealing groove 415, and the two fourteenth sealing back rings are respectively arranged on both sides of the fourteenth O-ring. Through the above design, that is, the thirteenth sealing groove 414 and the fourteenth sealing groove 415 are arranged along the circumferential direction on the outer wall of the connecting joint 41, the thirteenth O-ring and two thirteenth sealing back rings are arranged in the thirteenth sealing groove 414, and the fourteenth O-ring and two fourteenth sealing back rings are arranged in the fourteenth sealing groove 415, so the sealing performance of the connecting joint 41 combined with the intermediate joint 29 can be improved.

[0108] The inner wall of the upper end of the lower joint 42 is concave to form a seventh fixed cavity 421, and the lower end of the connecting joint 41 is sealed and arranged in the seventh fixed cavity 421. The lower end of the outer wall of the connecting joint 41 is concave in the circumferential direction to form a fifteenth sealing groove 416 and a sixteenth sealing groove 417. The fifteenth sealing groove 416 is located above the sixteenth sealing groove 417, wherein: the fifteenth O-ring and two fifteenth sealing back rings are arranged in the fifteenth sealing groove 416, and the two fifteenth sealing back rings are respectively arranged on both sides of the fifteenth O-ring; the sixteenth O-ring and two sixteenth sealing back rings are arranged in the sixteenth sealing groove 417, and the two sixteenth sealing back rings are respectively arranged on both sides of the sixteenth O-ring. Through the above design, that is, the fifteenth sealing groove 416 and the sixteenth sealing groove 417 are arranged along the circumferential direction at the lower end of the outer wall of the connecting joint 41, the fifteenth O-ring and two fifteenth sealing back rings are arranged in the fifteenth sealing groove 416, and the sixteenth O-ring and two sixteenth sealing back rings are arranged in the sixteenth sealing groove 417, so that the sealing performance of the connecting joint 41 and the lower joint 42 can be improved.

[0109] The embodiment of the present invention provides a high-temperature and high-pressure gas-tight APIB isolation valve, and its working principle is as follows: the isolation valve (i.e., the high-temperature and high-pressure gas-tight APIB isolation valve) is lowered into the wellbore to a predetermined position, the annulus is pressurized, and the rupture disk installed in the threaded hole 705 on the side wall of the static pressure joint 7 is opened, and the pressure enters the piston cavity (i.e., the cavity between the inner wall of the static pressure joint 7 and the outer wall of the static pressure piston 8) through the rupture disk, and the static pressure piston 8 moves upward due to the piston effect; since the lower end of the static pressure piston 8 is fastened to the upper end of the switch plug 26 through the fixing pin 809, the switch plug 26 is driven to move upward; The tube 26 and the cannula core shaft 15 move upward; since the lower end of the switch cannula 26 is fastened and connected with the clamping groove 263 on the outer side wall of the lower end of the switch cannula 26 through a plurality of clamping protrusions 314, the switch cannula 26 drives the pawl 31 to move upward while moving upward; at the same time, the lower end of the pawl 31 is sleeved on the upper end of the ball cage 33, and the upper end of the operating handle 37 is clamped in the positioning groove 315 on the outer side wall of the lower end of the pawl 31 through the first positioning protrusion 371, so the pawl 31 drives the ball cage 33 and the operating handle 37 to move upward while moving upward;

[0110] At the same time, since the lower end of one of the operating handles 37 is rotatably connected to the first positioning hole 361 on the ball valve core 36 through the mounting portion 374, and the lower end of the other operating handle 37 is rotatably connected to the second positioning hole 362 on the ball valve core 36 through the mounting portion 374, and the upper end of each operating handle 37 can be slidably connected in the positioning groove 315 through the first positioning protrusion 371, when the ball cage 33 and the operating handles 37 move upward, the ball valve core 36 and the two operating handles 37 cooperate to pull the ball valve core 36 to perform a 90° flipping movement in the ball cage 33, so that the central axis of the through hole 363 on the rotated ball valve core 36 and the central axis of the ball cage cavity 331 on the ball cage 33 are perpendicular, that is, the ball cage cavity 331 inside the ball cage 33 is closed by the rotated ball valve core 36, thereby achieving the purpose of closing the internal channel of the isolation valve;

[0111] When the internal passage of the isolation valve needs to be opened, the first O-ring 109 and the first sealing back ring 106 in the first sealing groove 103 and the second O-ring 107 and the two second sealing back rings 108 in the second sealing groove 104 are replaced; then the annulus is pressurized, and the static pressure piston 8 moves downward, while driving the cannula core shaft 15 and the switch cannula 26 to move downward; when the switch cannula 26 moves downward, the ratchet 31 is driven downward; when the ratchet 31 moves downward, the ball cage 33 and The operating handle 37 moves downward, thereby driving the ball valve core 36 in the ball cage 33 to perform a 90° flipping movement in the ball cage 33, so that the central axis of the through hole 363 on the rotated ball valve core 36 is parallel to the central axis of the ball cage cavity 331 on the ball cage 33, that is, the ball cage cavity 331 inside the ball cage 33 is opened by the rotated ball valve core 36, that is, the through hole 363 on the rotated ball valve core 36 is connected to the ball cage cavity 331, that is, the internal channel of the isolation valve is opened.

[0112] A high-temperature and high-pressure gas-tight APIB isolation valve provided in an embodiment of the present invention utilizes a ball valve core 36, a short valve seat 35, and a long valve seat 38 to realize the technical principle of sealing gas function. The materials of the ball valve core 36, the short valve seat 35, and the long valve seat 38 are all made of corrosion-resistant and high-hardness nickel-based alloy steel, and the processing accuracy reaches 0.8 microns. The vacuum degree of the ball valve core 36, the short valve seat 35, and the long valve seat 38 after grinding reaches 35%; at the same time, by grinding the ball valve core 36, the short valve seat 35, and the long valve seat 38, the sealing performance of the sealing surface where the ball valve core 36 contacts the short valve seat 35 and the long valve seat 38 is improved. Good, that is, the sealing level of the ball valve core 36 after manual grinding can reach 105MPa, so the isolation valve of the present invention can achieve the pressure level requirement of 105MPa; at the same time, in view of the high temperature requirement of the temperature level of 204℃, the various sealing back rings (such as the first sealing back ring, the second sealing back ring, etc.) and O-rings (such as the first O-ring, the second O-ring, etc.) used in the present invention adopt a rubber combination of different hardnesses with a temperature resistance of 204℃, and the V-shaped combination between the rubber parts (that is, the sealing assembly) enables the isolation valve to still effectively seal the gas at a pressure of 105MPa and a temperature of 204℃. In addition, isolation is carried out by annular pressure, and drilling and other operations are realized without well pressure. After the switch tool is connected and lowered into place, the structure formed by the upper joint 1, the static pressure joint 7, the static pressure piston 8, the insert mandrel 15 and the switch insert 26 is inserted into the tie-back joint 25, and the annular pressure can be carried out to reopen the pipe string channel, thereby improving the completion efficiency.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high temperature and high pressure gas-sealed APIB isolation valve, characterized in that: It includes an upper joint, a static pressure joint, a static pressure piston, a cannula core shaft, a switch cannula, a tie-back joint, an intermediate joint, a valve core assembly, a connecting joint and a lower joint, wherein: The lower end of the upper joint is sealed and arranged inside the upper end of the static pressure joint, the upper joint has an upper joint cavity inside, the upper part of the outer wall of the upper joint is evenly provided with a plurality of limiting grooves along the circumferential direction, the lower end of the upper joint is extended downward to be provided with a first connecting part, the upper part of the static pressure piston is located at the lower side of the upper joint, and the lower part of the static pressure piston is sealed and arranged inside the static pressure joint, and the upper end of the cannula core shaft is sealed and arranged at the lower end of the static pressure joint; A switch cannula is arranged inside the cannula core shaft, and the sealing sleeve of the lower outer wall of the cannula core shaft is provided with the return joint, the sealing sleeve on the lower outer wall of the return joint is provided with an intermediate joint, the sealing sleeve on the lower inner wall of the return joint is provided with a pawl, the lower part of the pawl is located inside the intermediate joint, the valve core assembly is arranged inside the intermediate joint, the upper part of the connecting joint is located inside the intermediate joint and abuts against the valve core assembly, and the sealing sleeve on the lower outer wall of the connecting joint is provided with the lower joint; The valve core assembly includes a ball cage, a short valve seat, a ball valve core and a long valve seat. The upper end of the pawl is sleeved on the outer side wall of the lower end of the switch insert, and the upper end of the ball cage is sleeved inside the lower end of the pawl. The short valve seat and the ball valve core are respectively installed inside the ball cage. The short valve seat is located above the ball valve core, and the lower end of the short valve seat abuts against the outer side wall of the ball valve core. The inner side wall of the upper end of the connecting joint is concave to form a first fixed cavity. The long valve seat is sealingly arranged in the first fixed cavity, and the upper end of the long valve seat abuts against the outer side wall of the ball valve core. The ball valve core includes a valve core body, a through hole is arranged inside the valve core body, and the outer wall of the valve core body is concave to form a first positioning hole and a second positioning hole. The angle between the central axis of the first positioning hole and the central axis of the second positioning hole is 120°, and the first positioning hole and the second positioning hole are respectively connected to the through hole.

2. The high temperature and high pressure gas-tight APIB isolation valve according to claim 1 is characterized in that: The upper joint cavity passes through the first connecting portion, and the outer diameter of the first connecting portion is smaller than the outer diameter of the upper joint; The first connection part is sealed inside the upper end of the static pressure joint, and a plurality of first fastening holes are evenly penetrated through the lower end of the outer wall of the first connection part along the circumferential direction, and a full-length tapered groove pin is arranged in the first fastening hole.

3. The high temperature and high pressure gas-tight APIB isolation valve according to claim 2 is characterized in that: The outer side wall of the first connecting portion is concavely formed with a first sealing groove and a second sealing groove along the circumferential direction, wherein: The first sealing groove is located above the second sealing groove, a first O-ring and two first sealing back rings are arranged in the first sealing groove, and the two first sealing back rings are respectively located on both sides of the first O-ring; The second sealing groove is located above the first fastening hole. A second O-ring and two second sealing back rings are arranged in the second sealing groove, and the two second sealing back rings are respectively located on both sides of the second O-ring.

4. The high temperature and high pressure gas-tight APIB isolation valve according to any one of claims 1 to 3, characterized in that: It also includes two operating handles, both of which are arranged inside the middle joint, wherein: The operating handle comprises an operating handle body, the cross sections of the outer side wall and the inner side wall of the operating handle body are both arc-shaped, the upper end of the inner side wall of the operating handle body is provided with a first positioning convex portion and a second positioning convex portion, and the first positioning convex portion is located above the second positioning convex portion; The side surface of the end of the first positioning protrusion away from the operating handle body is an arc surface, the side surface of the end of the second positioning protrusion away from the operating handle body is an arc surface, and a positioning recess is formed between the first positioning protrusion and the second positioning protrusion; A mounting portion is fixedly provided at the lower end of the inner side wall of the operating handle body, and the mounting portion is in the shape of a sphere. One mounting portion of the operating handle is installed in the first positioning hole, and the mounting portion of the other operating handle is installed in the second positioning hole.

5. The high temperature and high pressure gas-tight APIB isolation valve according to claim 2, characterized in that: The upper end of the outer wall of the static pressure piston is concave inwardly along the circumferential direction to form a third sealing groove, in which a third O-ring and two third sealing back rings are arranged, and the two third sealing back rings are respectively located on both sides of the third O-ring; The outer side wall of the static pressure piston is concave inwardly formed with a first fixing groove along the circumferential direction, and when the upper end of the static pressure piston is sealed and arranged inside the upper joint, one end of the full-length tapered groove pin is located in the first fastening hole, and the other end of the full-length tapered groove pin is located in the first fixing groove; The lower end of the outer wall of the static pressure piston is concave inwardly along the circumferential direction to form a fourth sealing groove, in which a fourth O-ring and two fourth sealing back rings are arranged, and the two fourth sealing back rings are respectively located on both sides of the fourth O-ring.

6. The high temperature and high pressure gas-tight APIB isolation valve according to claim 5, characterized in that: The inner side wall of the upper end of the static pressure joint is concave to form a second fixed cavity, and the first connecting part is sealed and arranged inside the second fixed cavity; The inner side wall of the lower end of the static pressure joint is concave to form a third fixed cavity, and the upper end of the cannula core shaft is sealed and arranged inside the third fixed cavity; The inner side wall of the third fixed cavity is concavely formed with a sixth sealing groove and a seventh sealing groove along the circumferential direction, the sixth sealing groove is located above the seventh sealing groove, a sixth O-ring and two sixth sealing back rings are arranged in the sixth sealing groove, and the two sixth sealing back rings are respectively located on both sides of the sixth O-ring; A seventh O-ring and two seventh sealing back rings are arranged in the seventh sealing groove, and the two seventh sealing back rings are respectively located on both sides of the seventh O-ring.

7. The high temperature and high pressure gas-tight APIB isolation valve according to claim 5, characterized in that: The lower end of the static pressure piston is extended downward to be provided with a second connection portion, and the static pressure piston has a static pressure piston cavity inside, and the static pressure piston cavity runs through the second connection portion, wherein: The lower portion of the outer wall of the second connecting portion is concave inwardly along the circumferential direction to form a fifth sealing groove, in which a fifth O-ring and two fifth sealing back rings are arranged, and the two fifth sealing back rings are respectively located on both sides of the fifth O-ring; The inner side wall at the lower end of the second connecting part is concave to form a fourth fixing cavity, the upper end of the switch insert is arranged inside the fourth fixing cavity, and a second fastening hole is penetrated through the side wall of the second connecting part, and a fastening pin is arranged in the second fastening hole.

8. The high temperature and high pressure gas-tight APIB isolation valve according to claim 4, characterized in that: The inner side wall of the upper end of the tie-back joint is concave to form a fifth fixed cavity, the lower end of the cannula core shaft is arranged inside the fifth fixed cavity, the lower end of the cannula core shaft is connected to a guide shoe, and the guide shoe is located at the bottom of the fifth fixed cavity; The lower end of the tie-back joint is extended downward to form a third connection portion, the tie-back joint has a tie-back joint cavity, the tie-back joint cavity passes through the third connection portion, and the third connection portion is sealed and arranged inside the upper end of the intermediate joint; The cannula core shaft has a cannula core shaft cavity inside, the cannula core shaft cavity is connected with the guide shoe cavity, and the switch cannula is located in the cannula core shaft cavity, the guide shoe cavity and the tie-back joint; The lower end of the switch insert is extended downward to form a fourth connection portion, the switch insert cavity passes through the fourth connection portion, and the upper end of the outer wall of the fourth connection portion is provided with a clamping groove along the circumferential direction. The third connecting portion is provided with an eighth sealing groove and a ninth sealing groove, the eighth sealing groove is provided with an eighth O-ring and two eighth sealing back rings, and the two eighth sealing back rings are respectively located on both sides of the eighth O-ring; A ninth O-ring and two ninth sealing back rings are arranged in the ninth sealing groove, and the two ninth sealing back rings are respectively located on both sides of the ninth O-ring.

9. The high temperature and high pressure gas-tight APIB isolation valve according to claim 8, characterized in that: The pawl comprises a pawl body, the pawl body has a pawl cavity, a fifth connecting portion is provided at the upper end of the pawl body extending upward, the pawl cavity passes through the fifth connecting portion, the fifth connecting portion is sealed inside the third connecting portion, and the fifth connecting portion is sleeved on the fourth connecting portion; The outer side wall of the fifth connecting part is evenly provided with a plurality of long strip through holes along the circumferential direction, and the long strip through holes extend to the upper end side surface of the fifth connecting part, and the upper end of the inner side wall of the fifth connecting part is provided with a clamping protrusion along the circumferential direction, and when the fifth connecting part is sleeved on the fourth connecting part, the clamping protrusion is clamped in the clamping groove; The lower end of the outer wall of the pawl body is concave inwardly along the circumferential direction to form a positioning groove, and the first positioning protrusions on the two operating handles are both clamped in the positioning groove; The outer side wall of the pawl body is concave inwardly along the circumferential direction to form a tenth sealing groove, a tenth sealing back ring is arranged in the tenth sealing groove, and the inner side wall of the lower end of the pawl body is concave inwardly to form a sixth fixing cavity.

10. The high temperature and high pressure gas-tight APIB isolation valve according to claim 9, characterized in that: The ball cage comprises a ball cage body, the ball cage body has a ball cage cavity inside, and the ball valve core is arranged in the ball cage cavity; A sixth connection part is fixedly provided at the upper end of the ball cage body, the outer diameter of the sixth connection part is smaller than the outer diameter of the ball cage body, the lower end of the sixth connection part extends to the inside of the ball cage cavity, the sixth connection part has a connection through hole inside, the inner diameter of the connection through hole is smaller than the inner diameter of the ball cage cavity, and the connection through hole is connected to the ball cage cavity; The outer side wall of the ball cage body is concavely formed with a first mounting through hole and a second mounting through hole, the first mounting through hole and the second mounting through hole both extend to the upper end side wall of the ball cage body, and the first mounting through hole and the second mounting through hole are both connected to the ball cage cavity; When the mounting parts on the two operating handles are respectively arranged in the first positioning hole and the second positioning hole, one of the operating handle bodies is located in the first mounting through hole, and the other operating handle body is located in the second mounting through hole, and at the same time, the first positioning protrusions on the two operating handles are both located in the positioning grooves.

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