A full-gauge plug valve that can automatically shut in and a method of using the same

Abstract

The application discloses a full-gauge plug valve capable of automatically closing a well and a use method thereof, and relates to the technical field of the structure of the full-gauge plug valve. Rectangular recesses are formed in the left and right outer side walls of a valve body B along the axial direction of the valve body B, and rotating shafts are rotatably installed in the side walls of the two rectangular recesses. A right driving component is arranged on the right side of the valve body B and used for driving the right rotating shaft to rotate, and a left driving component is arranged on the left side of the valve body B and used for driving the left rotating shaft to rotate. The right driving component comprises a fixing seat fixed between the front and back walls of the rectangular recess, a lock rod is slidably installed in the fixing seat, the left and right ends of a second spring are fixed to the fixing seat and a baffle respectively, and the left end of the lock rod is pressed against the outer end face of a driving gear under the elastic force of the second spring. The application has the beneficial effects of greatly improving the well closing efficiency and greatly reducing the working intensity of workers.

Description

Technical Field

[0001] This invention relates to the technical field of full-bore plug valve structures, and in particular to a full-bore plug valve capable of automatic well shut-off and its usage method. Background Technology

[0002] The drilling assembly includes a drill pipe, a full-bore plug valve, and a drill bit, connected sequentially from top to bottom. The top of the drill pipe is connected to the power end of the drilling rig. When the drilling rig is started, the power end drives the drill pipe, which in turn drives the full-bore plug valve and the drill bit to rotate synchronously. Simultaneously, the drill pipe and the drill bit move downwards synchronously, drilling into the formation to gradually form an oil production well. The function of the full-bore plug valve is: when a blowout occurs at the bottom of the well, the ball valve core A inside the full-bore plug valve cuts off the flow path of the drill bit from the flow path of the drill pipe, achieving well shut-in. This prevents high-pressure, high-flow-rate downhole fluid from flowing sequentially through the flow path of the drill bit, the ball valve core A of the full-bore plug valve, and the flow path of the drill pipe to downstream equipment, thus protecting the downstream equipment.

[0003] The structure of a certain full-bore plug valve is as follows: Figures 1-3 As shown, it includes a valve body A1, with an upper flow channel 2 and a lower flow channel 3 axially formed inside the valve body A1. An upper valve seat 4 and a lower valve seat 5 are welded into the upper flow channel 2 and the lower flow channel 3, respectively. A tapered external thread 6 is formed on the outer cylindrical surface of the lower end of the valve body A1. A spherical valve core A7 is provided between the lower valve seat 5 and the upper valve seat 4. A vertically arranged through hole A8 is formed inside the spherical valve core A7, which connects the upper flow channel 2 and the lower flow channel 3. An operating rod 9 is fixedly mounted on the right end of the spherical valve core A7 and rotatably installed in the right side wall of the valve body A1. An internal hexagonal hole 10 is formed on the right end face of the operating rod 9. A tapered internal thread 11 is formed on the inner wall of the top port of the upper flow channel 2.

[0004] The method of using this full-bore plug valve is as follows:

[0005] Sa, connect the tapered internal thread 11 of the full-bore plug valve to the bottom end of the drill rod, connect the top end of the drill rod to the power end of the drilling rig; connect the drill bit to the tapered external thread 6 of the full-bore plug valve, thereby completing the installation of the full-bore plug valve.

[0006] Sb. The worker opens the power end of the drilling rig, which drives the drill pipe to work. The drill pipe drives the full-bore plug valve and the drill bit to rotate synchronously, and also drives the full-bore plug valve and the drill bit to move downward synchronously. The drill bit drills into the formation to gradually form an oil production well. The downhole fluid generated during the drilling process flows sequentially through the flow channel of the drill bit, the lower flow channel 3 of the full-bore plug valve, the through hole A8 of the ball valve core A7 of the full-bore plug valve, the upper flow channel 2 of the full-bore plug valve, and finally through the flow channel of the drill pipe to the downstream equipment. The downstream equipment then processes the downhole fluid. The flow direction of the downhole fluid is as follows: Figure 4 As indicated by the middle arrow;

[0007] If, during drilling, the operator observes a significant increase in the pressure and flow rate of the downhole fluid flowing towards the downstream equipment, it indicates a blowout has occurred at the bottom of the well. In this case, the operator's procedure for shutting in the well is as follows:

[0008] Sb1. By raising the drill rod through the drilling rig, the drill rod drives the full-bore plug valve and the drill bit to move upward synchronously. When the full-bore plug valve just reaches the ground, stop raising the drill rod.

[0009] Sb2, The worker inserts a tool into the internal hexagonal hole 10 of the operating lever 9;

[0010] Sb3. The worker rotates the tool, which drives the operating lever 9 to rotate. The operating lever 9 drives the ball valve core A7 to rotate synchronously between the upper valve seat 4 and the lower valve seat 5. When the ball valve core A7 rotates 90°, it cuts off the upper flow channel 2 and the lower flow channel 3 of the full-bore plug valve. Figure 5 As shown, this cuts off the flow channels of the drill bit and the drill pipe, achieving the purpose of shutting in the well. This prevents the high-pressure, high-flow-rate downhole fluid from flowing sequentially through the flow channels of the drill bit, the ball valve core A7 of the full-bore plug valve, and the flow channels of the drill pipe to the downstream equipment, thereby protecting the downstream equipment.

[0011] However, while this full-bore plug valve can cut off the flow path between the drill bit and the drill pipe to achieve well shut-in, it still has the following technical drawbacks:

[0012] I. In steps Sb1 to Sb3, when the worker discovers a blowout at the bottom of the well, the worker needs to first lift the drill pipe and the full-bore plug valve upwards using the drilling rig, and then use a tool to rotate the operating rod 9 to rotate the ball valve core A7, thereby cutting off the upper flow channel 2 and the lower flow channel 3 of the full-bore plug valve, and then cutting off the flow channel of the drill bit and the flow channel of the drill pipe to achieve the purpose of shutting in the well. Among these steps, the process from lifting the drill pipe to rotating the operating rod 9 consumes a lot of time to complete the well shut-in, which undoubtedly reduces the well shut-in efficiency.

[0013] II. The worker needs to insert the tool into the internal hexagonal hole 10 of the operating rod 9 first, and then manually rotate the operating rod 9 to rotate the ball valve core A7 so that the ball valve core A7 can cut off the upper flow channel 2 and the lower flow channel 3 of the full-bore plug valve. The entire operation is done manually by the worker, and the effort required to rotate the tool undoubtedly increases the worker's workload in shutting down the well.

[0014] Therefore, there is an urgent need for a full-bore plug valve that can automatically shut off wells, which can greatly improve well shut-off efficiency and greatly reduce the workload of workers shutting off wells, as well as its usage method. Summary of the Invention

[0015] The purpose of this invention is to overcome the shortcomings of the prior art and provide a full-bore plug valve that can automatically shut off the well and its usage method.

[0016] The objective of this invention is achieved through the following technical solution: a full-bore plug valve capable of automatic well shut-off, comprising a valve body B, an upper flow channel and a lower flow channel axially formed within the valve body B, an upper valve seat and a lower valve seat respectively fixed within the upper and lower flow channels, a spherical valve core B disposed between the lower and upper valve seats, a vertically arranged through hole B within the spherical valve core B connecting the upper and lower flow channels, rectangular grooves axially formed on the left and right outer walls of the valve body B, and rotating shafts rotatably mounted within the side walls of the two rectangular grooves, with the inner ends of the two rotating shafts respectively fixed to the left and right ends of the spherical valve core B; a right actuating assembly for driving the right rotating shaft to rotate is provided on the right side of the valve body B, and a left actuating assembly for driving the left rotating shaft to rotate simultaneously is provided on the left side of the valve body B.

[0017] The right-hand actuation assembly includes a drive gear fixed on a rotating shaft and located in a rectangular sink, a transverse cylinder welded to the right side wall of the upper flow channel, and a transmission shaft fixed between the front and rear walls of the rectangular sink; a locking hole is provided in the lower end of the drive gear.

[0018] A push block is slidably installed inside the transverse cylinder. The left end of the push block has a force-bearing surface that tilts to the right and downwards. A rod is fixed on the right end of the push block. The right end of the rod is connected to a transverse rack that penetrates the right side wall of the valve body B and extends into the rectangular groove. A first spring is sleeved on the rod. The left and right ends of the first spring are fixed to the right end of the push block and the right side wall of the valve body B, respectively.

[0019] An intermediate gear is fixed on the drive shaft, which meshes with a transverse rack. A rightward-extending lever is also welded onto the drive shaft. The other end of the lever is hinged to a connecting rod via a pin shaft. The other end of the connecting rod is hinged to a vertical rack, which meshes with a drive gear. A guide rod is fixed at the bottom of the vertical rack and extends downward through the bottom wall of the rectangular sink.

[0020] The right-hand actuation assembly includes a fixed base fixed between the front and rear walls of a rectangular sink. A locking rod is slidably installed inside the fixed base. A baffle is fixed on the right end of the locking rod. A second spring in a stretched state is sleeved on the locking rod. The left and right ends of the second spring are fixed to the fixed base and the baffle, respectively. Under the elastic force of the second spring, the left end of the locking rod presses against the outer end face of the drive gear.

[0021] A spherical cavity is provided on the bottom surface of the upper valve seat and the top surface of the lower valve seat, and the spherical cavity is matched with the spherical surface of the spherical valve core B.

[0022] The upper end of the valve body B has a cylindrical external thread on its outer cylindrical surface, and a protective cylinder that covers the two rectangular sinkers is threaded onto the cylindrical external thread.

[0023] A tapered external thread is provided on the outer cylindrical surface of the lower end of the valve body B, and a tapered internal thread is provided on the inner wall of the top port of the upper flow channel.

[0024] A dynamic seal is provided between the rotating shaft and the valve body B.

[0025] A U-shaped groove is provided on the bottom wall of the left end of the transverse cylinder, and the U-shaped groove is located directly below the force-bearing surface.

[0026] An annular groove is provided on the outer cylindrical surface of the pusher block, and a sealing ring is fitted on the annular groove, with the sealing ring in contact with the inner wall of the transverse cylinder.

[0027] A hinge seat is fixed at the top of the vertical rack, and the other end of the connecting rod is hinged to the hinge seat; a guide hole corresponding to the guide rod is opened in the bottom wall of the rectangular sink groove, and the guide rod is slidably installed in the guide hole.

[0028] The right toggle assembly and the left toggle assembly are symmetrical about valve body B.

[0029] A method for using a full-bore plug valve with automatic well shut-off capability, comprising the following steps:

[0030] S1. Connect the tapered internal thread of the full-bore plug valve to the bottom end of the drill rod, and connect the top end of the drill rod to the power end of the drilling rig; connect the drill bit to the tapered external thread of the full-bore plug valve, thereby completing the installation of the full-bore plug valve.

[0031] S2. Start the drilling rig. The power end of the drilling rig drives the drill pipe to work. The drill pipe drives the full-bore plug valve and the drill bit to rotate synchronously. At the same time, it also drives the full-bore plug valve and the drill bit to move downward synchronously. The drill bit drills into the formation to gradually form an oil production well. The downhole fluid generated during the drilling process flows sequentially through the flow channel of the drill bit, the lower flow channel of the full-bore plug valve, the through hole B of the ball valve core B of the full-bore plug valve, the upper flow channel of the full-bore plug valve, and finally through the flow channel of the drill pipe to the downstream equipment. The downstream equipment then processes the downhole fluid.

[0032] If a blowout occurs at the bottom of the well, the resulting high-pressure, high-flow-rate downhole fluid passes through the U-shaped grooves of the transverse cylinder of the right actuating component and the transverse cylinder of the left actuating component, and then acts on the force-bearing surface of the push block. Under the thrust of the high-pressure, high-flow-rate downhole fluid, the push block moves outward along the transverse cylinder, gradually compressing the first spring. At the same time, the push block drives the rod and the transverse rack to move outward synchronously. The transverse rack drives the intermediate gear to rotate inward, the intermediate gear drives the transmission shaft to rotate synchronously, the transmission shaft drives the actuating rod to rotate synchronously, the actuating rod drives the connecting rod to move inward, the connecting rod drives the vertical rack to move downward, the vertical rack drives the drive gear to rotate, the drive gear drives the lock hole inside to rotate synchronously, and at the same time, the drive gear also drives the rotating shaft to rotate around its own axis. The rotating shaft drives the ball valve core B to rotate synchronously between the upper valve seat and the lower valve seat.

[0033] When the locking hole of the drive gear rotates to be opposite to the left and right of the locking rod, the second spring, which is in a stretched state, drives the baffle and the locking rod to move to the left synchronously under the elastic restoring force. The locking rod is inserted into the locking hole of the drive gear, and the drive gear is locked and no longer rotates. At this time, the ball valve core B just cuts off the upper and lower flow channels of the full-bore plug valve, and then cuts off the flow channels of the drill bit and the drill pipe, so as to achieve the purpose of shutting off the well. This prevents the high-pressure, high-flow-rate downhole fluid from flowing sequentially through the flow channels of the drill bit, the ball valve core B of the full-bore plug valve, and the flow channels of the drill pipe to the downstream equipment.

[0034] S3. Once the blowout at the bottom of the well ceases, the next step for the worker is:

[0035] S31. By lifting the drill rod with the drilling rig, the drill rod drives the full-bore plug valve and the drill bit to move upward synchronously. When the full-bore plug valve just reaches the ground, stop lifting the drill rod.

[0036] S32. The worker pumps out the downhole fluid remaining in the drill pipe flow channel and the upper flow channel of the full-bore plug valve. Then the worker rotates the protective cylinder, which moves upward relative to the valve body B. When the rectangular sinker is exposed, the worker stops rotating the protective cylinder.

[0037] S33. The worker pulls out the locking levers of the right and left actuating components. After pulling them out, the locking levers remain stationary. At this time, the first spring, which is in a compressed state, gradually returns to its original position under the elastic restoring force. The first spring drives the push block to move inward. The push block drives the rod and the transverse rack to move inward synchronously. The transverse rack drives the middle gear to rotate outward, which in turn causes the connecting rod to move outward. The connecting rod drives the vertical rack to move upward. The vertical rack drives the drive gear to rotate in the opposite direction. The drive gear drives the rotating shaft to rotate around its own axis. The rotating shaft drives the ball valve core B to rotate in the opposite direction between the upper and lower valve seats.

[0038] When the first spring returns to its natural state from the compressed state, the through hole B of the ball valve core B of the full-bore plug valve connects the upper and lower flow channels again; finally, the worker releases the locking rod, which, under the tension of the second spring, rests against the outer end face of the drive gear again, thus preparing for subsequent drilling.

[0039] The present invention has the following advantages: it greatly improves well shut-in efficiency and greatly reduces the workload of workers shutting in wells. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a full-bore plug valve in the prior art;

[0041] Figure 2 for Figure 1 A schematic diagram showing the connection between the ball valve core A and the operating rod;

[0042] Figure 3 for Figure 2 Main section diagram;

[0043] Figure 4 A schematic diagram showing the flow of downhole fluid within a conventional full-bore plug valve;

[0044] Figure 5 A schematic diagram illustrating the well shut-in process using a full-bore plug valve based on existing technology;

[0045] Figure 6 This is a schematic diagram of the structure of the present invention;

[0046] Figure 7 for Figure 6 A schematic diagram of the partial cross-section;

[0047] Figure 8 To remove Figure 6 A schematic diagram of the structure behind the protective cylinder;

[0048] Figure 9 for Figure 8 M-direction schematic diagram;

[0049] Figure 10 To remove Figure 8 A schematic diagram showing the fixed base, locking rod, and second spring in the middle;

[0050] Figure 11 This is a schematic diagram showing the connection between valve body B, drive gear, ball valve B, upper valve seat, lower valve seat, and transverse cylinder.

[0051] Figure 12 for Figure 11 A schematic diagram of the partial cross-section;

[0052] Figure 13 This is a schematic diagram showing the connection between the ball valve core B, the rotating shaft, and the drive gear.

[0053] Figure 14 for Figure 13 Main section diagram;

[0054] Figure 15 This is a schematic diagram of the lower valve seat.

[0055] Figure 16 for Figure 15 Main section diagram;

[0056] Figure 17 This is a schematic diagram of the structure of a horizontal cylindrical body;

[0057] Figure 18 for Figure 17 Main section diagram;

[0058] Figure 19 A schematic diagram showing the connection between the push block, the rod, and the transverse rack;

[0059] Figure 20 for Figure 19 A schematic diagram of the partial cross-section;

[0060] Figure 21 This is a schematic diagram showing the connection between the vertical rack, hinge seat, and guide rod.

[0061] Figure 22 This is a schematic diagram showing the flow of downhole fluid within this full-bore plug valve;

[0062] Figure 23 This is a schematic diagram illustrating the movement of the lever and the vertical rack.

[0063] Figure 24 This is a schematic diagram showing the lock hole of the drive gear rotated to a position where it is opposite to the left and right sides of the lock rod.

[0064] Figure 25 This is a schematic diagram of the locking rod being inserted into the lock hole of the drive gear;

[0065] Figure 26 This is a schematic diagram of the protective cylinder moving upwards;

[0066] In the picture:

[0067] 1-Valve body A, 2-Upper flow channel, 3-Lower flow channel, 4-Upper valve seat, 5-Lower valve seat, 6-Tapered external thread, 7-Spherical valve core A, 8-Through hole A, 9-Operating rod, 10-Internal hexagonal hole, 11-Tapered internal thread;

[0068] 12-Valve body B, 13-Spherical valve core B, 14-Through hole B, 15-Rectangular groove, 16-Rotating shaft, 17-Drive gear, 18-Transverse cylinder, 19-Transmission shaft, 20-Lock hole;

[0069] 21-Push block, 22-Force-bearing surface, 23-Rod, 24-Transverse rack, 25-First spring, 26-Intermediate gear, 27-Actuating rod, 28-Connecting rod, 29-Vertical rack, 30-Guide rod;

[0070] 31-Fixed base, 32-Locking rod, 33-Baffle, 34-Second spring;

[0071] 35-Spherical cavity, 36-Cylindrical external thread, 37-Protective cylinder, 38-U-shaped groove, 39-Annular groove, 40-Hinge seat, 41-Guide hole. Detailed Implementation

[0072] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description:

[0073] like Figures 6-21 As shown, a full-bore plug valve capable of automatic well shut-off includes a valve body B12. An upper flow channel 2 and a lower flow channel 3 are provided axially within the valve body B12. An upper valve seat 4 and a lower valve seat 5 are respectively fixed within the upper flow channel 2 and the lower flow channel 3. A spherical valve core B13 is provided between the lower valve seat 5 and the upper valve seat 4. Spherical cavities 35 are provided on the bottom surface of the upper valve seat 4 and the top surface of the lower valve seat 5. The spherical cavities 35 are matched with the spherical surface of the spherical valve core B13.

[0074] The spherical valve core B13 has a vertically arranged through hole B14, which connects the upper flow channel 2 and the lower flow channel 3. The left and right outer walls of the valve body B12 are each provided with a rectangular groove 15 along its axial direction. A rotating shaft 16 is rotatably installed in the side wall of each of the two rectangular grooves 15. A dynamic seal is provided between the rotating shaft 16 and the valve body B12. The inner ends of the two rotating shafts 16 are respectively fixed to the left and right ends of the spherical valve core B13. The right side of the valve body B12 is provided with a right actuating assembly for driving the right rotating shaft 16 to rotate, and the left side of the valve body B12 is provided with a left actuating assembly for driving the left rotating shaft 16 to rotate simultaneously. The right actuating assembly and the left actuating assembly are symmetrical about the valve body B12.

[0075] The right-hand actuating assembly includes a drive gear 17 fixed on the rotating shaft 16 and located in the rectangular sink 15, a transverse cylinder 18 welded to the right side wall of the upper flow channel 2, and a transmission shaft 19 fixed between the front and rear walls of the rectangular sink 15. A locking hole 20 is provided in the lower end of the drive gear 17. A push block 21 is slidably installed in the transverse cylinder 18. A force-bearing surface 22 inclined to the right and downward is provided at the left end of the push block 21. A rod 23 is fixed on the right end of the push block 21. A transverse rack 24 that penetrates the right side wall of the valve body B12 and extends into the rectangular sink 15 is connected to the right end of the rod 23. A first spring 25 is sleeved on the rod 23. The left and right ends of the first spring 25 are fixed to the right end of the push block 21 and the right side wall of the valve body B12, respectively. A U-shaped groove 38 is provided on the bottom wall of the left end of the transverse cylinder 18. The U-shaped groove 38 is located directly below the force-bearing surface 22.

[0076] An intermediate gear 26 is fixedly mounted on the drive shaft 19, and the intermediate gear 26 meshes with a transverse rack 24. A rightward extending actuating rod 27 is also welded onto the drive shaft 19. The other end of the actuating rod 27 is hinged to a connecting rod 28 via a pin shaft. The other end of the connecting rod 28 is hinged to a vertical rack 29, which meshes with a drive gear 17. A guide rod 30 is fixedly mounted at the bottom of the vertical rack 29, and the guide rod 30 passes downward through the bottom wall of the rectangular sink 15. A hinge seat 40 is fixedly mounted at the top of the vertical rack 29, and the other end of the connecting rod 28 is hinged to the hinge seat 40. A guide hole 41 corresponding to the guide rod 30 is opened in the bottom wall of the rectangular sink 15, and the guide rod 30 is slidably installed in the guide hole 41.

[0077] The right-hand actuation assembly includes a fixed base 31 fixed between the front and rear walls of the rectangular sink 15. A locking rod 32 is slidably installed in the fixed base 31. A baffle 33 is fixed on the right end of the locking rod 32. A second spring 34 in a stretched state is sleeved on the locking rod 32. The left and right ends of the second spring 34 are fixed on the fixed base 31 and the baffle 33, respectively. Under the elastic force of the second spring 34, the left end of the locking rod 32 presses against the outer end face of the drive gear 17.

[0078] A cylindrical external thread 36 is formed on the outer cylindrical surface of the upper end of the valve body B12, and a protective cylinder 37 that covers the two rectangular recesses 15 is threaded onto the cylindrical external thread 36. A tapered external thread 6 is formed on the outer cylindrical surface of the lower end of the valve body B12, and a tapered internal thread 11 is formed on the inner wall of the top port of the upper flow channel 2.

[0079] An annular groove 39 is provided on the outer cylindrical surface of the pusher block 21, and a sealing ring is fitted on the annular groove 39. The sealing ring is in contact with the inner wall of the transverse cylinder 18.

[0080] A method for using a full-bore plug valve with automatic well shut-off capability, comprising the following steps:

[0081] S1. Connect the tapered internal thread 11 of the full-bore plug valve to the bottom end of the drill rod, and connect the top end of the drill rod to the power end of the drilling rig; connect the drill bit to the tapered external thread 6 of the full-bore plug valve, thereby completing the installation of the full-bore plug valve.

[0082] S2. Start the drilling rig. The power end of the drilling rig drives the drill pipe to work. The drill pipe drives the full-bore plug valve and the drill bit to rotate synchronously. At the same time, it also drives the full-bore plug valve and the drill bit to move downward synchronously. The drill bit drills into the formation to gradually form an oil production well. The downhole fluid generated during the drilling process flows sequentially through the flow channel of the drill bit, the lower flow channel 3 of the full-bore plug valve, the through hole B14 of the ball valve core B13 of the full-bore plug valve, the upper flow channel 2 of the full-bore plug valve, and finally through the flow channel of the drill pipe to the downstream equipment. The downstream equipment then processes the downhole fluid. The flow direction of the downhole fluid is as follows: Figure 22 As indicated by the middle arrow;

[0083] If a blowout occurs at the bottom of the well, the resulting high-pressure, high-flow-rate downhole fluid passes through the U-shaped groove 38 of the transverse cylinder 18 of the right actuating assembly and the U-shaped groove 38 of the transverse cylinder 18 of the left actuating assembly, and then acts on the force-bearing surface 22 of the push block 21. Under the thrust of the high-pressure, high-flow-rate downhole fluid, the push block 21 moves outward along the transverse cylinder 18, gradually compressing the first spring 25. At the same time, the push block 21 drives the rod 23 and the transverse rack 24 to move outward synchronously. The transverse rack 24 drives the intermediate gear 26 to rotate inward, and the intermediate gear 26 drives the transmission shaft 19 to rotate synchronously. The transmission shaft 19 drives the actuating rod 27 to rotate synchronously. The rotation direction of the actuating rod 27 is as follows: Figure 23 As shown by the solid arrow, the actuating lever 27 drives the connecting rod 28 to move inward, and the connecting rod 28 drives the vertical rack 29 to move downward. The direction of movement of the vertical rack 29 is as follows: Figure 23 As shown by the hollow arrow, the vertical rack 29 drives the drive gear 17 to rotate, and the drive gear 17 drives the lock hole 20 inside to rotate synchronously. At the same time, the drive gear 17 also drives the rotating shaft 16 to rotate around its own axis, and the rotating shaft 16 drives the ball valve core B13 to rotate synchronously between the upper valve seat 4 and the lower valve seat 5.

[0084] When the locking hole 20 of the drive gear 17 rotates to be approximately opposite to the locking rod 32, as Figure 24 As shown, the second spring 34, under the elastic restoring force, drives the baffle 33 and the locking rod 32 to move synchronously to the left. The locking rod 32 is inserted into the locking hole 20 of the drive gear 17, as shown. Figure 25 As shown, the drive gear 17 is locked and no longer rotates. At this time, the ball valve core B13 just cuts off the upper flow channel 2 and the lower flow channel 3 of the full-bore plug valve, as... Figure 25As shown, the flow channels of the drill bit and the drill pipe are cut off to achieve the purpose of shutting in the well, thereby preventing the high-pressure, high-flow-rate downhole fluid from flowing sequentially through the flow channels of the drill bit, the ball valve core B13 of the full-bore plug valve, and the flow channels of the drill pipe to the downstream equipment.

[0085] As can be seen from step S2, when a blowout occurs at the bottom of the well, the resulting high-pressure, high-flow-rate downhole fluid will immediately act on the force-bearing surface 22 of the push block 21, thereby pushing the push block 21 to move outward along the transverse cylinder 18, which in turn drives the rod 23 and the transverse rack 24 to move outward synchronously. The transverse rack 24 drives the intermediate gear 26 to rotate inward, which in turn drives the actuating rod 27 to rotate inward synchronously. The actuating rod 27 then drives the vertical rack 29 to move downward via the connecting rod 28. The vertical rack 29 drives the drive gear 17 to rotate around its own axis. The drive gear 17 drives the rotating shaft 16 to rotate synchronously. The rotating shaft 16 drives the ball valve core B13 to rotate synchronously. When the drive gear 17 is locked by the locking rod 32, the ball valve core B13 can be quickly and timely cut off the upper flow channel 2 and the lower flow channel 3, thereby finally completing the quick and timely well shut-in.

[0086] Therefore, it can be seen that this full-bore plug valve is superior to... Figures 1-5 The full-bore plug valve shown eliminates the need for workers to first lift the drill pipe and full-bore plug valve upwards using the drilling rig after discovering a blowout at the bottom of the well, and then use a tool to rotate the operating rod 9 to rotate the ball valve core A7 in order to complete the well shut-in. Instead, it utilizes the high pressure and high flow rate of downhole fluid generated by the blowout to quickly and timely shut down the well, eliminating most of the shut-in procedures, thus shortening the shut-in time and greatly improving the shut-in efficiency.

[0087] Furthermore, this full-bore plug valve is comparable to... Figures 1-5 The full-bore plug valve shown does not require workers to manually rotate the operating lever 9 to rotate the ball valve core A7. Instead, it automatically drives the rotating shaft 16 to rotate, which in turn automatically rotates the ball valve core B13, thus greatly reducing the workload of workers shutting down the well.

[0088] S3. Once the blowout at the bottom of the well ceases, the next step for the worker is:

[0089] S31. By lifting the drill rod with the drilling rig, the drill rod drives the full-bore plug valve and the drill bit to move upward synchronously. When the full-bore plug valve just reaches the ground, stop lifting the drill rod.

[0090] S32. The worker pumps out the downhole fluid remaining in the drill pipe flow channel and the upper flow channel 2 of the full-bore plug valve. Then, the worker rotates the protective cylinder 37, which moves upward relative to the valve body B12. Figure 26 As shown, once the rectangular sink 15 is exposed, the worker stops rotating the protective cylinder 37.

[0091] S33. The worker pulls out the locking lever 32 of the right actuating component and the locking lever 32 of the left actuating component. The direction of pulling out the locking lever 32 is as follows: Figure 26 As shown by the solid arrow, when the locking lever 32 is pulled out, the first spring 25, which is in a compressed state, gradually returns to its original position under the elastic restoring force. The first spring 25 drives the push block 21 to move inward. The push block 21 drives the rod 23 and the transverse rack 24 to move inward synchronously. The transverse rack 24 drives the intermediate gear 26 to rotate outward, which in turn causes the connecting rod 28 to move outward. The connecting rod 28 drives the vertical rack 29 to move upward. The vertical rack 29 drives the drive gear 17 to rotate in the opposite direction. The drive gear 17 drives the rotating shaft 16 to rotate around its own axis. The rotating shaft 16 drives the ball valve core B13 to rotate in the opposite direction between the upper valve seat 4 and the lower valve seat 5.

[0092] When the first spring 25 returns to its natural state from the compressed state, the through hole B14 of the ball valve core B13 of the full-bore plug valve connects the upper flow channel 2 and the lower flow channel 3 again; finally, the worker releases the locking rod 32, and the locking rod 32 abuts against the outer end face of the drive gear 17 again under the tension of the second spring 34, thus preparing for subsequent drilling.

Claims

1. An automatic shut-in full bore plug valve, comprising a valve body B (12), an upper flow passage (2) and a lower flow passage (3) are formed in the valve body B (12) along the axial direction, an upper valve seat (4) and a lower valve seat (5) are respectively fixed in the upper flow passage (2) and the lower flow passage (3), a spherical valve core B (13) is arranged between the upper valve seat (4) and the lower valve seat (5), a vertical through hole B (14) is formed in the spherical valve core B (13), and the through hole B (14) communicates the upper flow passage (2) and the lower flow passage (3), characterized in that: rectangular recesses (15) are formed in the left and right outer side walls of the valve body B (12) along the axial direction, a rotating shaft (16) is rotatably installed in the side wall of each of the two rectangular recesses (15), and the inner side ends of the two rotating shafts (16) are respectively fixed on the left and right end portions of the spherical valve core B (13); a right pushing assembly is arranged on the right side of the valve body B (12) and used for driving the right rotating shaft (16) to rotate, and a left pushing assembly is arranged on the left side of the valve body B (12) and used for driving the left rotating shaft (16) to rotate simultaneously. The right pushing assembly comprises a driving gear (17) fixed on the rotating shaft (16) and located in the rectangular recess (15), a transverse cylinder (18) welded to the right side wall of the upper flow passage (2), and a transmission shaft (19) fixed between the front and rear walls of the rectangular recess (15); a lock hole (20) is formed in the lower end portion of the driving gear (17). A push block (21) is slidably installed in the transverse cylinder (18), a left end portion of the push block (21) is provided with a right-inclined-down stress surface (22), a rod member (23) is fixed on the right end portion of the push block (21), a transverse rack (24) penetrating through the right side wall of the valve body B (12) and extending into the rectangular recess (15) is connected to the right end portion of the rod member (23), a first spring (25) is sleeved on the rod member (23), and the left and right ends of the first spring (25) are respectively fixed on the right end portion of the push block (21) and the right side wall of the valve body B (12). An intermediate gear (26) is fixed on the transmission shaft (19), the intermediate gear (26) is engaged with the transverse rack (24), a pushing rod (27) extending to the right is further welded to the transmission shaft (19), the other end of the pushing rod (27) is hingedly connected with a connecting rod (28), the other end of the connecting rod (28) is hingedly connected with a vertical rack (29), the vertical rack (29) is engaged with the driving gear (17), a guide rod (30) is fixed on the bottom of the vertical rack (29), and the guide rod (30) downwardly penetrates through the bottom wall of the rectangular recess (15). The right pushing assembly comprises a fixing seat (31) fixed between the front and rear walls of the rectangular recess (15), a lock rod (32) is slidably installed in the fixing seat (31), a baffle (33) is fixed on the right end portion of the lock rod (32), a second spring (34) in a stretched state is sleeved on the lock rod (32), the left and right ends of the second spring (34) are respectively fixed on the fixing seat (31) and the baffle (33), and under the elastic force of the second spring (34), the left end portion of the lock rod (32) abuts against the outer end surface of the driving gear (17). ​ 2. A full-gauge plug valve capable of automatically shutting in a well according to claim 1, characterized in that: The bottom surface of the upper valve seat (4) and the top surface of the lower valve seat (5) are both provided with a spherical cavity (35) matched with the spherical surface of the spherical valve core B (13).

3. A full-gauge gate valve that can automatically close the well according to claim 2, characterized in that: The outer cylindrical surface of the upper end of the valve body B (12) is provided with a cylindrical external thread (36), and the cylindrical external thread (36) is threadedly connected with a protective cylinder (37) covering the two rectangular sunken grooves (15).

4. A full-gauge gate valve that can automatically close the well according to claim 3, characterized in that: The outer cylindrical surface of the lower end of the valve body B (12) is provided with a tapered external thread (6), and the inner wall of the top end port of the upper flow passage (2) is provided with a tapered internal thread (11).

5. A full-gauge gate valve that can automatically close the well according to claim 4, characterized in that: A dynamic sealing member is arranged between the rotating shaft (16) and the valve body B (12).

6. A full-gauge gate valve that can automatically close the well according to claim 5, characterized in that: The bottom wall of the left end of the transverse cylinder (18) is provided with a U-shaped groove (38) located directly below the stress surface (22).

7. A full-gauge gate valve that can automatically close the well according to claim 6, characterized in that: The outer cylindrical surface of the push block (21) is provided with an annular groove (39) in which a sealing ring is arranged, and the sealing ring is in contact with the inner wall of the transverse cylinder (18).

8. A full-gauge gate valve that can automatically close the well according to claim 7, characterized in that: The top end of the vertical rack (29) is fixedly provided with a hinge seat (40), and the other end of the connecting rod (28) is hingedly connected to the hinge seat (40); the bottom wall of the rectangular sunken groove (15) is provided with a guide hole (41) corresponding to the guide rod (30), and the guide rod (30) is slidingly installed in the guide hole (41).

9. A full-gauge gate valve that can automatically close the well according to claim 8, characterized in that: The right and left dialing assemblies are left-right symmetrical about the valve body B (12).

10. A method of using an automatic shut-in full-gauge plug valve, comprising the steps of: providing an automatic shut-in full-gauge plug valve according to claim 9; and operating the automatic shut-in full-gauge plug valve. It comprises the following steps: S1, connect the tapered internal thread (11) of the full-bore plug valve to the bottom end of the drill pipe, connect the top end of the drill pipe to the power end of the drilling machine, and connect the drill bit to the tapered external thread (6) of the full-bore plug valve, thereby completing the installation of the full-bore plug valve; S2, start the drilling machine, the power end of the drilling machine drives the drill pipe to work, the drill pipe drives the full-bore plug valve and the drill bit to rotate synchronously, and also drives the full-bore plug valve and the drill bit to move downward synchronously, the drill bit drills into the formation to gradually form an oil production well, and the downhole fluid generated during drilling sequentially flows through the flow passage of the drill bit, the lower flow passage (3) of the full-bore plug valve, the through hole B (14) of the spherical valve core B (13) of the full-bore plug valve, the upper flow passage (2) of the full-bore plug valve, and finally flows to the rear equipment through the flow passage of the drill pipe, and the rear equipment processes the downhole fluid again; When the blowout occurs at the bottom of the well, the high-pressure and high-flow downhole fluid passes through the U-shaped slot (38) of the right and left pusher assemblies, and then acts on the force surface (22) of the push block (21). Under the thrust of the high-pressure and high-flow downhole fluid, the push block (21) moves outward along the lateral cylinder (18), and the push block (21) gradually compresses the first spring (25). At the same time, the push block (21) drives the rod (23) and the lateral rack (24) to move outward synchronously, the lateral rack (24) drives the intermediate gear (26) to rotate inward, the intermediate gear (26) drives the transmission shaft (19) to rotate synchronously, the transmission shaft (19) drives the push rod (27) to rotate synchronously, the push rod (27) drives the connecting rod (28) to move inward, the connecting rod (28) drives the vertical rack (29) to move downward, the vertical rack (29) drives the drive gear (17) to rotate, and the drive gear (17) drives the lock hole (20) in it to rotate synchronously. At the same time, the drive gear (17) also drives the rotating shaft (16) to rotate around its own axis, and the rotating shaft (16) drives the spherical valve core B (13) to rotate synchronously between the upper valve seat (4) and the lower valve seat (5); When the lock hole (20) of the drive gear (17) rotates to the left and right opposite side of the lock rod (32), the second spring (34) in the stretched state drives the baffle (33) and the lock rod (32) to move leftward synchronously under the elastic restoring force, the lock rod (32) is inserted into the lock hole (20) of the drive gear (17), and the drive gear (17) is locked and no longer rotates. At this time, the spherical valve core B (13) just cuts off the upper flow passage (2) and the lower flow passage (3) of the full-bore plug valve, and then cuts off the flow passage of the drill bit and the flow passage of the drill pipe, so as to achieve the purpose of closing the well, and then prevent the high-pressure and high-flow downhole fluid from flowing to the rear equipment in turn through the flow passage of the drill bit, the spherical valve core B (13) of the full-bore plug valve and the flow passage of the drill pipe; S3, when the blowout no longer occurs at the bottom of the well, the next operation of the worker is: S31, the worker raises the drill pipe on the drilling machine, the drill pipe drives the full-bore plug valve and the drill bit to move upward synchronously, and stops raising the drill pipe when the full-bore plug valve just moves to the ground; S32, the worker pumps out the downhole fluid left in the flow passage of the drill pipe and the upper flow passage (2) of the full-bore plug valve, and then rotates the protective cylinder (37), the protective cylinder (37) moves upward relative to the valve body B (12), and the worker stops rotating the protective cylinder (37) when the rectangular groove (15) is exposed. ​ S33, the worker pulls out the lock rod (32) of the right push component and the lock rod (32) of the left push component, when pulled out, keep the lock rod (32) still, at this time, the first spring (25) in the compression state gradually resets under the elastic recovery force, the first spring (25) drives the push block (21) to move inward, the push block (21) drives the rod (23) and the transverse rack (24) to move inward synchronously, the transverse rack (24) drives the intermediate gear (26) to rotate outward, in turn makes the connecting rod (28) move outward, the connecting rod (28) drives the vertical rack (29) to move upward, the vertical rack (29) drives the driving gear (17) to rotate reversely, the driving gear (17) drives the rotating shaft (16) to rotate around its own axis, the rotating shaft (16) drives the ball valve core B (13) to rotate reversely between the upper valve seat (4) and the lower valve seat (5); When the first spring (25) recovers from the compression state to the natural state, the through hole B (14) of the ball valve core B (13) of the full bore plug valve again communicates the upper flow passage (2) and the lower flow passage (3); finally, the worker releases the lock rod (32), the lock rod (32) again abuts against the outer end face of the driving gear (17) under the stretching force of the second spring (34), thereby preparing for subsequent drilling.

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