Low torque kelly cock valve for ultra-deep well

Abstract

The application discloses a low-torque kelly cock valve for super-deep well, and particularly relates to the valve field. The kelly cock valve comprises a valve body, an upper valve seat, a ball valve, a lower valve seat, a split ring and a thrust ring are sequentially arranged in the valve body, a plurality of balls are arranged in the upper valve seat and the lower valve seat and are pressed on the surface of the ball valve through elastic members, a ring groove is formed in the inner wall of the valve body, the split ring is arranged in the ring groove, and the thrust ring is inserted in the middle of the split ring. The split ring is divided into a plurality of blocks by a split line, and a separation gap is formed at the position of the split line when the outer cylindrical surface of each split ring is coplanar. The split ring is gathered to the middle or is spread apart in the circumferential direction to achieve the purpose of releasing or repositioning the lower valve seat. After the release, a separation gap is formed between the ball valve and the upper valve seat and the lower valve seat, and the ball valve is in rolling friction when the ball valve is rotated. After the repositioning, the separation gap disappears, and the sealing between the ball valve and the upper valve seat and the lower valve seat becomes hard sealing.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically, to a low-torque square drill pipe plug valve for ultra-deep wells. Background Technology

[0002] The angular drill pipe plug valve is a manual control valve in the drilling circulation system and is one of the essential tools for preventing blowouts and well kicks. Angular drill pipe plug valves are classified into upper angular drill pipe plug valves and lower angular drill pipe plug valves according to their connection points. The upper angular drill pipe plug valve connects between the lower end of the swivel and the upper end of the angular drill pipe, while the lower angular drill pipe plug valve connects between the lower end of the angular drill pipe and the drill string.

[0003] The square drill pipe plug valve mainly consists of a valve body, upper valve seat, ball valve, lower valve seat, knob, sealing ring, and coupling ring. Opening or closing is achieved by simply turning the knob with a special wrench according to the instructions to actuate the ball valve. However, in existing square drill pipe plug valves, when the pressure difference between the two ends is large, the pressure difference intensifies the sealing between the ball valve and the upper and lower valve seats, generating enormous clamping and frictional forces. This significantly increases the resistance to rotating the ball valve, requiring a large torque to open, making manual operation difficult.

[0004] Existing technology adds balls between the ball valve and the upper and lower valve seats to reduce friction. However, the balls create gaps between the ball valve and the upper and lower valve seats, which can easily cause leakage. While adding a sealing ring in the gap can prevent leakage to some extent, it increases friction and the sealing ring will be in direct contact with the liquid, posing a greater risk of corrosion and failure. Summary of the Invention

[0005] The present invention provides a low-torque square drill pipe plug valve for ultra-deep wells, which aims to solve the problem that the ball bearings of existing square drill pipe plug valves can cause gaps between the ball valve and the upper and lower valve seats, resulting in a high risk of corrosion failure of the sealing rings and easy failure.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-torque square drill pipe plug valve for ultra-deep wells, comprising a valve body, wherein an upper valve seat, a ball valve, a lower valve seat, a splicing ring, and a thrust ring are sequentially installed inside the valve body. The upper and lower valve seats each contain several balls pressed against the surface of the ball valve by elastic elements. An annular groove is formed on the inner wall of the valve body, and the splicing ring is disposed inside the annular groove. The thrust ring is inserted into the middle of the splicing ring. The splicing ring is divided into multiple pieces by a dividing line. When the outer cylindrical surfaces of each splicing ring are coplanar, a separation gap is formed at the position of the dividing line. The side of the annular groove away from the lower valve seat is a conical surface. When the thrust ring is pulled out from inside the splicing ring, the splicing ring converges towards the center and moves away from the lower valve seat along the conical surface, thereby forming a separation gap between the ball valve and the upper and lower valve seats.

[0007] Preferably, the splicing ring is divided into four parts by two parallel dividing lines.

[0008] Preferably, the side of the splicing ring away from the lower valve seat has a second conical surface, and the side of the thrust ring near the lower valve seat has a third conical surface. When the splicing ring converges towards the center, the second and third conical surfaces fit together.

[0009] Preferably, a moving drive assembly is installed inside the valve body. The moving drive assembly includes a rotating shaft installed in the radial direction of the valve body, an eccentric wheel installed at the bottom of the rotating shaft, and a groove is formed on the outer surface of the thrust ring, with the eccentric wheel located inside the groove.

[0010] Preferably, the moving drive assembly further includes a sleeve that is rotatably disposed in the radial direction inside the valve body, a rotating shaft that is slidably inserted into the inside of the sleeve, and a compression spring that is pressed between the sleeve and the eccentric wheel.

[0011] Preferably, a rotary drive assembly is provided in the radial direction of the valve body. The rotary drive assembly is used to drive the ball valve to rotate, thereby opening or closing the square drill pipe plug valve. The rotary drive assembly includes a knob and a rotating block disposed on the lower side of the knob. Both the knob and the rotating block are disposed in the radial direction inside the valve body. A bottom groove is provided at the bottom of the knob, and a slot is provided at the upper end of the ball valve. The upper and lower sides of the rotating block have upper and lower protrusions arranged perpendicularly to each other. The upper protrusion slides inside the bottom groove, and the lower protrusion slides inside the slot.

[0012] Preferably, a drive operation component is provided on the outer side of the valve body. The drive operation component includes a gear and a rack, which mesh with each other, and the gear is fixed on the sleeve.

[0013] Preferably, the drive operation component further includes a relay block, which is fixed to the knob. A side groove is provided on the side wall of the relay block, and a rotating part is provided on the upper side of the relay block. A drive rod is provided on the rotating part and inserted into the side groove.

[0014] Preferably, the surface of the rotating component is provided with a driving groove, which includes an inclined groove and an arc-shaped groove in sequence. The two ends of the inclined groove are located on the side close to and away from the middle of the rotating component, respectively. A pin is installed at the end of the rack, and the pin slides inside the driving groove.

[0015] Preferably, a cover plate is installed on the valve body, and two limit blocks are provided on the cover plate. An indicator block is provided on one side of the upper end of the rotating part, and the indicator block moves between the two limit blocks.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention utilizes the splicing ring to converge towards the center or to spread outwards in the circumferential direction to achieve the purpose of releasing or re-limiting the lower valve seat. After releasing the limit, a separation gap is formed between the ball valve and the upper and lower valve seats. When the ball valve is rotated, rolling friction occurs. After re-limiting, the separation gap disappears, and the seal between the ball valve and the upper and lower valve seats becomes a hard seal. There is no longer a need to set a sealing ring, thereby avoiding the problem of increased friction and corrosion failure of the sealing ring.

[0017] 2. The present invention, through the setting of the driving operation component, uses the rotation of the lever to first realize the generation of the separation gap, so that the ball extends, and then drives the ball valve to rotate, so as to open the plug valve of the square drill rod, and the opening is achieved by rolling friction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of the local structure at point A; Figure 4 This is a schematic diagram of the structure of the splicing ring of the present invention; Figure 5 This is a partial structural diagram of the present invention. Figure 1 ; Figure 6 This is a partial structural diagram of the present invention. Figure 2 ; Figure 7 For the present invention Figure 6 Exploded view; Figure 8 This is a schematic diagram of the structure of the moving drive assembly and rotating component of the present invention; Figure 9 This is a schematic diagram of the installation of the pin and drive slot of the present invention.

[0019] The attached figures are labeled as follows: 1. Valve body; 10. Cover plate; 110. Limiting block; 11. Annular groove; 12. Conical surface one; 2. Upper valve seat; 20. Stacked spring; 3. Lower valve seat; 4. Ball valve; 41. Groove; 5. Ball; 51. Elastic element; 6. Joining ring; 60. Separation gap; 61. Conical surface two; 7. Thrust ring; 71. Conical surface three; 72. Groove; 8. Rotary drive assembly; 81. Knob; 811. Bottom groove; 82. Rotating block; 821. Upper convexity. 822, Lower protrusion; 9, Motion drive assembly; 91, Rotating shaft; 92, Eccentric wheel; 93, Sleeve; 94, Compression spring; 100, Drive operation assembly; 101, Gear; 102, Rack; 103, Pin; 104, Rotating component; 1041, Drive rod; 1042, Tool slot; 1043, Indicator block; 105, Drive slot; 1051, Inclined slot; 1052, Arc slot; 106, Relay block; 1061, Side slot. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Refer to the instruction manual appendix Figures 1-9 A low-torque square drill pipe plug valve for ultra-deep wells includes a valve body 1. Inside the valve body 1, an upper valve seat 2, a ball valve 4, a lower valve seat 3, a coupling ring 6, and a thrust ring 7 are sequentially installed. The upper valve seat 2 and the lower valve seat 3 each have several balls 5 pressed against the surface of the ball valve 4 by elastic elements 51, where the elastic elements 51 are springs. An annular groove 11 is formed on the inner wall of the valve body 1, and the coupling ring 6 is disposed inside the annular groove 11. The thrust ring 7 is inserted into the middle of the coupling ring 6. The end of a stacked spring 20 abuts against a step inside the valve body 1, and the stacked spring 20 is pressed between the step on the upper valve seat 2 and the step on the valve body 1. The coupling ring 6 is divided into multiple pieces by dividing lines, specifically, as shown... Figure 4 As shown, the splicing ring 6 is divided into four parts by two parallel dividing lines. When the outer cylindrical surfaces of each splicing ring 6 are coplanar, that is, when the axes coincide, a separation gap 60 is formed at the position of the dividing line. The side of the annular groove 11 away from the lower valve seat 3 is a conical surface 12. When the thrust ring 7 is pulled out from the inside of the splicing ring 6, the splicing ring 6 gathers towards the center and moves away from the lower valve seat 3 along the conical surface 12, thereby forming a separation gap between the ball valve 4 and the upper valve seat 2 and the lower valve seat 3.

[0022] Furthermore, the side of the splicing ring 6 away from the lower valve seat 3 has a second conical surface 61, and the side of the thrust ring 7 close to the lower valve seat 3 has a third conical surface 71. When the splicing ring 6 converges towards the center, the second conical surface 61 and the third conical surface 71 fit together.

[0023] It should be noted that when the thrust ring 7 is pulled out from the inside of the splicing ring 6, the splicing ring 6 gathers towards the center and moves along the first conical surface 12. If it is necessary to restore the gathered splicing ring 6, the thrust ring 7 is pushed towards the lower valve seat 3, and the third conical surface 71 contacts the second conical surface 61, thereby pushing the splicing ring 6 to gather and move back to its original position.

[0024] In this embodiment, as Figure 3 and Figure 7 As shown, a rotary drive assembly 8 is provided in the radial direction of the valve body 1. The rotary drive assembly 8 is used to drive the ball valve 4 to rotate, thereby opening or closing the square drill pipe plug valve.

[0025] In this embodiment, as Figure 3 and Figure 8 As shown, a moving drive assembly 9 is installed inside the valve body 1. The moving drive assembly 9 includes a rotating shaft 91 installed in the radial direction of the valve body 1. An eccentric wheel 92 is installed at the bottom of the rotating shaft 91. A groove 72 is opened on the outer surface of the thrust ring 7. The eccentric wheel 92 is located inside the groove 72.

[0026] It should be noted that when the rotating shaft 91 is rotated, the rotating shaft 91 drives the eccentric wheel 92 to rotate. The eccentric wheel 92 drives the thrust ring 7 to move by pushing the side wall of the groove 72, so that the thrust ring 7 is separated from the middle of the splicing ring 6. In this way, after the splicing ring 6 is unrestrained, it will gather towards the middle.

[0027] Furthermore, the moving drive assembly 9 also includes a sleeve 93 that is rotatably disposed in the radial direction inside the valve body 1, a rotating shaft 91 that is slidably inserted into the inside of the sleeve 93, and a compression spring 94 is pressed between the sleeve 93 and the eccentric wheel 92.

[0028] It should be noted that when installing the thrust ring 7 and the moving drive assembly 9, the moving drive assembly 9 should be installed first, followed by the thrust ring 7. When installing the thrust ring 7, the eccentric wheel 92 can be moved upwards by pulling the shaft 91 upwards, allowing it to move to the inner wall of the valve body 1 first, thus avoiding collision with the thrust ring 7. After the thrust ring 7 is in place, the shaft 91 is released, and the eccentric wheel 92 is pushed downwards into the groove 72 by the compression spring 94. The shaft 91 is slidably connected to the sleeve 93 via a spline. Alternatively, the shaft 91 can be installed directly without pulling it up; the eccentric wheel 92 can then enter the groove 72 along the conical surface 71 and the inclined surface at the step on the thrust ring 7.

[0029] In this embodiment, the implementation is as follows: During use, rotating the rotary drive assembly 8 drives the ball valve 4 to rotate, which can open or close the angular drill pipe plug valve. When the pressure difference between the two ends of the angular drill pipe plug valve is large, the pressure difference will intensify the sealing fit between the ball valve 4 and the upper valve seat 2 and the lower valve seat 3, generating huge clamping force and friction, resulting in a significant increase in the resistance to rotation of the ball valve 4, requiring a large torque to open, making it difficult to open manually. At this time, first rotate the sleeve 93, which drives the rotating shaft 91 and the eccentric wheel 92 to rotate. The eccentric wheel 92 pushes the side wall of the groove 72 to drive the thrust ring 7 to move away from the lower valve seat 3, disengaging it from the middle of the splicing ring 6. At this time, since the splicing ring 6 loses the limit of the thrust ring 7, and since the splicing ring 6 is pressed against the end of the lower valve seat 3 to limit the lower valve seat 3, the splicing ring 6 and the lower valve seat 3 can move. Under the action of liquid pressure difference, the ball valve 4 is pushed to move a small distance, which in turn pushes the lower valve seat 3 and the splicing ring 6 to move. This causes the splicing ring 6 to converge towards the center and move away from the lower valve seat 3 along the cone surface 12. At this time, the cone surface 71 and the cone surface 61 are in contact. Because the lower valve seat 3 has moved, the distance between the upper valve seat 2 and the lower valve seat 3 increases, creating a separation gap between the ball valve 4 and the upper valve seat 2, and between the ball valve 4 and the lower valve seat 3. Under the action of the elastic element 51, the ball 5 extends out of the separation gap and presses against the surface of the ball valve 4. Thus, when the ball valve 4 is rotated to open the square drill pipe plug valve, the original sliding friction between the ball valve 4 and the upper valve seat 2 and the lower valve seat 3 is changed to rolling friction, which greatly reduces the torque required for opening. When closed, the sleeve 93 can be rotated to drive the eccentric wheel 92 to rotate, pushing the thrust ring 7 back to its original position. The thrust ring 7 then pushes the conical surface 61 through the conical surface 3 71, causing the splicing ring 6 to spread out in the circumferential direction and move back into the annular groove 11 along the conical surface 12. At this time, the thrust ring 7 limits the splicing ring 6, and the splicing ring 6 presses against the end of the lower valve seat 3 to limit the lower valve seat 3. The separation gap between the ball valve 4 and the lower valve seat 3, and between the upper valve seat 2 and the lower valve seat 3, also disappears. The ball 5 returns to the interior of the upper valve seat 2 and the lower valve seat 3, and the seal between the ball valve 4 and the upper valve seat 2 and the lower valve seat 3 becomes a hard seal, and there is no longer a need to set a sealing ring.

[0030] The above technical solution utilizes the splicing ring 6 to converge towards the center or to disperse in the circumferential direction to achieve the purpose of releasing or re-limiting the lower valve seat 3. After the limit is released, a separation gap is formed between the ball valve 4 and the upper valve seat 2 and the lower valve seat 3. When the ball valve 4 is rotated, rolling friction occurs. After the limit is re-limited, the separation gap disappears, and the seal between the ball valve 4 and the upper valve seat 2 and the lower valve seat 3 becomes a hard seal. There is no need to set a sealing ring, thereby avoiding the problem of increased friction and corrosion failure of the sealing ring.

[0031] Refer to the instruction manual appendix Figures 2-3 and Figures 5-6When the valve is opened, the ball valve 4 moves a small distance to one side, causing a change in the rotation axis of the ball valve 4. To continue driving the ball valve 4 to rotate without affecting its movement, a specific structural form of the rotary drive assembly 8 is proposed. Specifically, the rotary drive assembly 8 includes a knob 81 and a rotating block 82 disposed below the knob 81. Both the knob 81 and the rotating block 82 are disposed radially inside the valve body 1. The bottom of the knob 81 has a bottom groove 811, and the upper end of the ball valve 4 has a slot 41. The upper and lower sides of the rotating block 82 have an upper protrusion 821 and a lower protrusion 822 arranged perpendicularly to each other. The upper protrusion 821 slides inside the bottom groove 811, and the lower protrusion 822 slides inside the slot 41.

[0032] It should be noted that when the knob 81 and the ball valve 4 are not on the same axis of rotation, when the knob 81 is rotated, the knob 81 drives the ball valve 4 to rotate through the rotating block 82. During this process, the upper protrusion 821 slides inside the bottom groove 811, and the lower protrusion 822 slides inside the groove 41. The upper protrusion 821 and the lower protrusion 822 are set in a vertical form to accommodate the positional change of the rotating block 82 in the horizontal plane during the rotation.

[0033] Refer to the instruction manual appendix Figures 1-9 A drive operation component 100 is provided on the outside of the valve body 1. The drive operation component 100 includes a gear 101 and a rack 102. The gear 101 and the rack 102 mesh with each other. The gear 101 is fixed on the sleeve 93.

[0034] It should be noted that when the rack 102 is pushed to move, the rack 102 drives the gear 101 to rotate, the gear 101 drives the sleeve 93 to rotate, and in turn drives the rotating shaft 91 and the eccentric wheel 92 to rotate.

[0035] Furthermore, the drive operation assembly 100 also includes a relay block 106, which is fixed to the knob 81. A side groove 1061 is provided on the side wall of the relay block 106, and a rotating member 104 is provided on the upper side of the relay block 106. A drive rod 1041 is provided on the rotating member 104 and inserted into the side groove 1061.

[0036] It should be noted that the upper end of the rotating part 104 is provided with a tool groove 1042. The tool groove 1042 is used for inserting a manual tool to turn the rotating part 104. When the rotating part 104 rotates, it pushes the side wall of the side groove 1061 through the drive rod 1041, thereby driving the relay block 106 to rotate. The relay block 106 drives the knob 81 to rotate, and the knob 81 then drives the ball valve 4 to rotate through the rotating block 82.

[0037] Furthermore, a drive groove 105 is provided on the surface of the rotating member 104. The drive groove 105 includes a slanted groove 1051 and an arc-shaped groove 1052 in sequence. The two ends of the slanted groove 1051 are located on the side close to and away from the middle of the rotating member 104, respectively. A pin 103 is installed at the end of the rack 102, and the pin 103 slides inside the drive groove 105.

[0038] It should be noted that when the rotating component 104 rotates, the pin 103 first slides inside the inclined groove 1051 towards the arc-shaped groove 1052, which drives the rack 102 to move. When the rack 102 moves, it can drive the eccentric wheel 92 to rotate through transmission. During this process, the drive rod 1041 slides inside the side groove 1061 but does not push the relay block 106 to rotate. When the pin 103 moves to the inside of the arc-shaped groove 1052, the rack 102 no longer moves, and the rotation of the rotating component 104 will push the side wall of the side groove 1061 through the drive rod 1041, thereby driving the relay block 106 to rotate.

[0039] In this embodiment, the specific implementation method is as follows: When the angular drill pipe stop valve is to be opened, the operator uses a tool to rotate the rotating component 104. The pin 103 first slides inside the inclined groove 1051 towards the arc-shaped groove 1052, which drives the rack 102 to move. The rack 102 drives the rotating shaft 91 and the eccentric wheel 92 to rotate through transmission. The eccentric wheel 92 drives the thrust ring 7 to move away from the lower valve seat 3 by pushing the side wall of the groove 72, disengaging it from the middle of the splicing ring 6. After the pin 103 moves into the arc-shaped groove 1052, the rack 102 stops moving, and the rotation of the rotating component 104 pushes the side wall of the side groove 1061 through the drive rod 1041, thereby driving the relay block 106 to rotate. The relay block 106 drives the ball valve 4 to rotate through the rotation drive assembly 8, opening the angular drill pipe stop valve.

[0040] The above technical solution, through the setting of the drive operation component 100, uses the rotating part 104 to rotate, first to realize the generation of the separation gap, so that the ball 5 extends, and then drives the ball valve 4 to rotate, so as to open the square drill rod plug valve, and the opening is rolling friction.

[0041] Working principle: When opening the angular drill pipe stop valve, the operator uses a tool to rotate the rotating component 104. When the pin 103 slides inside the inclined groove 1051, it drives the eccentric wheel 92 to rotate, causing the thrust ring 7 to disengage from the middle of the splicing ring 6, creating a separation gap. When the pin 103 slides inside the arc groove 1052, the rotating component 104 drives the relay block 106 to rotate, thereby driving the ball valve 4 through the rotary drive assembly 8 to open the angular drill pipe stop valve. When closing the angular drill pipe stop valve, the rotating component 104 is rotated in the opposite direction. The rotating component 104 first drives the ball valve 4 to rotate and close the angular drill pipe stop valve. In the latter half of the closing process, the conical surface 12 drives the eccentric wheel 92 to rotate, causing the thrust ring 7 to move and limit the splicing ring 6.

[0042] Refer to the instruction manual appendix Figure 1 A cover plate 10 is installed on the valve body 1. Two limit blocks 110 are provided on the cover plate 10. An indicator block 1043 is provided on one side of the upper end of the rotating part 104. The indicator block 1043 moves between the two limit blocks 110.

[0043] It should be noted that when the indicator block 1043 contacts the two limit blocks 110 respectively, the square drill pipe plug valve opens or closes, the purpose of which is to indicate to the operator that the valve is open or closed in place.

[0044] When assembling the drill pipe plug valve, first install the sealing ring and stacked spring 20 on the upper valve seat 2, then install the upper valve seat 2 into the valve body 1; assemble the knob 81 and rotating block 82 into their corresponding positions; push the ball valve 4 into the valve body 1, so that the lower protrusion 822 aligns with the groove 41; after putting the sealing ring on the lower valve seat 3, assemble the lower valve seat 3 into the valve body 1; install the splicing ring 6 into the annular groove 11; after installing the moving drive assembly 9 into its corresponding position, lift the rotating shaft 91 and push in the thrust ring 7, so that the thrust ring 7 is inserted into the splicing ring. In the middle of ring 6, loosen the rotating shaft 91, and the eccentric wheel 92 enters the groove 72; finally, install the external components of valve body 1. First, insert the relay block 106 into the rotary drive assembly 8, and then insert the rotating part 104 into the relay block 106, so that the drive rod 1041 is located inside the side groove 1061; install the gear 101 on the sleeve 93, and then install the rack 102, so that the pin 103 is inserted into the drive groove 105; cover the cover plate 10 and fix it with screws, and the tool groove 1042 protrudes outside the cover plate 10.

[0045] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-torque square drill pipe plug valve for ultra-deep wells, characterized in that: The valve body (1) includes an upper valve seat (2), a ball valve (4), a lower valve seat (3), a splicing ring (6), and a thrust ring (7) installed in sequence inside the valve body (1). The upper valve seat (2) and the lower valve seat (3) are each provided with a number of balls (5) pressed against the surface of the ball valve (4) by elastic elements (51). The valve body (1) has an annular groove (11) on its inner wall, the splicing ring (6) is disposed inside the annular groove (11), and the thrust ring (7) is inserted into the middle of the splicing ring (6); The splicing ring (6) is divided into multiple pieces by the dividing line. When the outer cylindrical surfaces of each splicing ring (6) are coplanar, a separation gap (60) is formed at the position of the dividing line. The side of the ring groove (11) away from the lower valve seat (3) is a conical surface (12). When the thrust ring (7) is pulled out from the inside of the splicing ring (6), the splicing ring (6) gathers towards the center and moves away from the lower valve seat (3) along the conical surface (12), thereby forming a separation gap between the ball valve (4) and the upper valve seat (2) and the lower valve seat (3). The valve body (1) is equipped with a moving drive assembly (9). The moving drive assembly (9) includes a rotating shaft (91) installed in the radial direction of the valve body (1). An eccentric wheel (92) is installed at the bottom of the rotating shaft (91). A groove (72) is provided on the outer surface of the thrust ring (7). The eccentric wheel (92) is located inside the groove (72). The moving drive assembly (9) further includes a sleeve (93) that is rotatably disposed in the radial direction inside the valve body (1), the rotating shaft (91) is slidably inserted into the inside of the sleeve (93), and a compression spring (94) is pressed between the sleeve (93) and the eccentric wheel (92). A rotary drive assembly (8) is provided in the radial direction of the valve body (1). The rotary drive assembly (8) is used to drive the ball valve (4) to rotate, thereby opening or closing the square drill pipe plug valve. The rotary drive assembly (8) includes a knob (81) and a rotating block (82) provided on the lower side of the knob (81). The knob (81) and the rotating block (82) are both provided in the radial direction inside the valve body (1). The bottom of the knob (81) is provided with a bottom groove (811). The upper end of the ball valve (4) is provided with a slot (41). The upper and lower sides of the rotating block (82) have an upper protrusion (821) and a lower protrusion (822) arranged perpendicularly to each other. The upper protrusion (821) slides inside the bottom groove (811), and the lower protrusion (822) slides inside the slot (41). A drive operation assembly (100) is provided on the outside of the valve body (1). The drive operation assembly (100) includes a gear (101) and a rack (102). The gear (101) and the rack (102) mesh with each other. The gear (101) is fixed on the sleeve (93). The drive operation component (100) further includes a relay block (106), which is fixed to the knob (81). A side groove (1061) is provided on the side wall of the relay block (106), and a rotating part (104) is provided on the upper side of the relay block (106). A drive rod (1041) is provided on the rotating part (104), and the drive rod (1041) is inserted into the side groove (1061). The surface of the rotating component (104) is provided with a driving groove (105). The driving groove (105) includes a slanted groove (1051) and an arc-shaped groove (1052) in sequence. The two ends of the slanted groove (1051) are located on the side close to and away from the middle of the rotating component (104), respectively. A pin (103) is installed at the end of the rack (102), and the pin (103) slides inside the driving groove (105).

2. The low-torque square drill pipe plug valve for ultra-deep wells according to claim 1, characterized in that: The assembled ring (6) is divided into four pieces by two parallel dividing lines.

3. The low-torque square drill pipe plug valve for ultra-deep wells according to claim 1, characterized in that: The splicing ring (6) has a cone surface two (61) on the side away from the lower valve seat (3), and the thrust ring (7) has a cone surface three (71) on the side close to the lower valve seat (3). When the splicing ring (6) converges towards the center, the cone surface two (61) and the cone surface three (71) fit together.

4. The low-torque square drill pipe plug valve for ultra-deep wells according to claim 1, characterized in that: A cover plate (10) is installed on the valve body (1), and two limit blocks (110) are provided on the cover plate (10). An indicator block (1043) is provided on one side of the upper end of the rotating part (104), and the indicator block (1043) moves between the two limit blocks (110).

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