Kelly bar plug valve for oil field drilling and production

Abstract

The invention discloses a kelly bar plug valve for oil field drilling and production, and belongs to the field of oil drilling and production equipment. A cavity is formed in the valve body, a valve element is rotationally inserted into the cavity, and a through hole penetrating through the side wall of the valve element is formed in the side wall of the valve element. A water inlet pipe and a water outlet pipe are respectively inserted into the opposite side walls of the cavity; extension lines of the water inlet pipe and the water outlet pipe are positioned on the same straight line; the valve element is provided with a buffering bin. According to the scheme, through mutual cooperation of the surge bin and the liquid inlet, in the clockwise rotation process of the valve element, the liquid inlet is gradually communicated with the water inlet pipe, at the moment, part of fluid discharged from the water inlet pipe enters the surge bin, the valve closing speed is high, the surge bin cannot be filled with the fluid, and therefore the pressure of the fluid entering the surge bin is not enough to open the pressure release valve; part of fluid penetrates through the through hole, and in the process, the effect of preventing impact force borne by the valve element from being increased is achieved, so that friction force between the valve element and the valve body is prevented from being increased, and the effect of reducing the abrasion degree of the valve element and the valve body is achieved.

Description

Technical Field

[0001] This invention relates to the field of oil drilling and production equipment, and more specifically, to a plug valve for oilfield drilling and production square drill pipes. Background Technology

[0002] The angular drill pipe plug valve is a common blowout preventer. In drilling operations, to avoid serious blowout accidents, angular drill pipe plug valves are connected to the upper and lower ends of the angular drill pipe. Existing angular drill pipe plug valves have internal structures such as valve ball, valve seat, and inner ring. The angular drill pipe plug valve is opened or closed by rotating it 90 degrees according to the instructions with a special wrench, which causes the internal ball valve to rotate.

[0003] During the opening and closing of a plug valve, the valve core is directly impacted by high-speed fluid, which can easily cause radial or axial displacement of the valve core, thereby increasing the normal pressure between the valve core and the valve body sealing surface. Under these circumstances, the frictional force at the contact interface between the valve core and the valve body increases significantly, leading to difficulty in opening and closing, accelerating the wear of sealing elements, and affecting the valve's sealing performance and service life.

[0004] Therefore, a plug valve for the drilling pipe in oilfields is proposed. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide an oilfield drilling pipe plug valve that can reduce the pressure between the valve core and the valve body.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A plug valve for an oilfield drilling pipe includes a valve body; The valve body has a cavity, and a valve core is rotatably inserted into the cavity. A through hole is provided on the side wall of the valve core. Water inlet pipes and water outlet pipes are respectively inserted into the side walls on opposite sides of the cavity, and the extension lines of the water inlet pipes and water outlet pipes are on the same straight line; A buffer chamber is provided on the valve core, and an inlet communicating with the cavity is provided on the side wall of the buffer chamber near the water inlet pipe. A pressure relief valve with its output end connected to a through hole is fixedly embedded on the side wall of the buffer chamber. A push plate is slidably installed inside the buffer chamber, and the push plate is located below the pressure relief valve. The valve core is equipped with a drive mechanism for driving the push plate to move.

[0008] Furthermore, the drive mechanism includes a pressurization chamber formed on the valve core, and a threaded rod is vertically and rotatably inserted into the top wall of the pressurization chamber; A pressure plate is threaded onto the threaded rod; An air bladder is installed between the pressure plate and the bottom wall of the pressure chamber. The output end of the air bladder extends into the space below the push plate in the buffer chamber, and the valve core is equipped with a rotating mechanism for driving the threaded rod to rotate.

[0009] Furthermore, the rotating mechanism includes a rotating rod that is vertically rotatably inserted into the through hole, the bottom end of the rotating rod being fixedly connected to the top end of the threaded rod, and wind cups being uniformly fixedly installed on the side wall of the rotating rod.

[0010] Furthermore, a spring is installed between the threaded rod and the side wall of the pressure chamber; The through hole is a cuboid, and the rotating rod is located at the upper left of the cross-section of the through hole.

[0011] Furthermore, the airbag is made of elastic material.

[0012] Furthermore, a mounting rod is fixedly installed on the inner wall of the through hole, and a filter screen is installed on the mounting rod.

[0013] Furthermore, the filter screen includes a steel plate and holes. The holes are evenly distributed on the surface of the steel plate, and the closed figure formed by the extension line of the holes, the extension line of the mounting rod near the drain pipe, and the surface of the steel plate on the same horizontal plane is a right triangle.

[0014] Furthermore, the filter screen is movably mounted on the mounting rod, and an elastic element is installed between the filter screen and the side wall of the through hole.

[0015] Furthermore, a cavity is formed in the elastic element, and a pressure hole is formed on the side wall of the cavity near the drain pipe. Furthermore, the elastic element is an elastic bellows, and the elastic bellows is sleeved on the mounting rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In this scheme, through the cooperation between the buffer chamber and the inlet, during the clockwise rotation of the valve core, the inlet gradually connects with the water inlet pipe. At this time, some of the fluid discharged from the water inlet pipe enters the buffer chamber, and the valve closes quickly, so the fluid cannot fill the buffer chamber. Therefore, the fluid pressure entering the buffer chamber is insufficient to open the pressure relief valve. Some fluid passes through the through hole, which in this process prevents the valve core from being subjected to increased impact force, thereby preventing the friction between the valve core and the valve body from increasing, and reducing the wear of the valve core and the valve body.

[0017] (2) In this scheme, through the cooperation of the mounting rod and the filter screen, during the rotation of the valve core, the fluid flowing in the through hole will first pass through the holes on the surface of the filter screen and then hit the side wall of the through hole under the action of the mounting rod. During the process of the fluid passing through the filter screen, the kinetic energy of the fluid is converted into internal energy, which reduces the impact force of the fluid on the side wall of the through hole, that is, reduces the impact force on the valve core, and plays the role of reducing the friction between the valve core and the valve body. At the same time, the inclined hole can change the flow direction of the fluid, further reducing the impact force of the fluid passing through the hole on the side wall of the through hole.

[0018] (3) This solution sets an elastic element on the mounting rod. When the fluid impacts the filter screen, the elastic element contracts, and the kinetic energy of the fluid is converted into the elastic potential energy of the elastic element, which further reduces the kinetic energy of the fluid, that is, reduces the friction between the valve core and the valve body.

[0019] (4) This solution opens a pressurization chamber on the elastic element. When the front side of the filter screen with holes is impacted by fluid, the elastic element contracts, and the fluid in the cavity is discharged through the pressurization hole.

[0020] The flow direction of the fluid discharged from the pressurization hole is parallel to the sidewall of the through hole, and the fluid discharged from the pressurization hole impacts the fluid flowing towards the sidewall of the through hole, thereby subjecting the fluid flowing towards the sidewall of the through hole to thrust.

[0021] This reduces the impact force of the fluid flowing towards the sidewall of the through hole on the sidewall when it comes into contact with the sidewall, and thus reduces the friction between the valve core and the valve body. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the valve core structure of the present invention; Figure 3 This is a schematic cross-sectional view of the combined valve body and valve core of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A; Figure 5 This is a cross-sectional view of the valve core of the present invention. Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the combined structure of the buffer chamber and the liquid inlet of the present invention.

[0023] Explanation of the labels in the diagram: 1. Valve body; 2. Valve core; 3. Through hole; 4. Inlet pipe; 5. Drain pipe; 6. Buffer chamber; 7. Liquid inlet; 8. Pressure relief valve; 9. Push plate; 10. Pressurization chamber; 11. Threaded rod; 12. Pressure plate; 13. Air bladder; 14. Rotating rod; 15. Air cup; 16. Spring; 17. Mounting rod; 18. Filter screen; 1801. Steel plate; 1802. Hole; 19. Elastic element; 20. Cavity; 21. Pressurization hole. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Example 1: Please see Figures 1 to 7 A plug valve for oilfield drilling and production square drill pipe, comprising a valve body 1; A cavity is provided on the valve body 1, and a valve core 2 is rotatably inserted into the cavity. A through hole 3 is provided on the side wall of the valve core 2. Water inlet pipe 4 and water outlet pipe 5, which are matched with through hole 3, are respectively inserted on the side walls of opposite sides of the cavity. The extension lines of water inlet pipe 4 and water outlet pipe 5 are located on the same straight line. A buffer chamber 6 is provided on the valve core 2, and an inlet 7 communicating with the cavity is provided on the side wall of the buffer chamber 6 near the water inlet pipe 4. A pressure relief valve 8 with its output end connected to the through hole 3 is fixedly embedded on the side wall of the buffer chamber 6. A push plate 9 is slidably installed inside the buffer chamber 6, and the push plate 9 is located below the pressure relief valve 8. A drive mechanism for driving the push plate 9 to move is provided on the valve core 2.

[0026] During normal operation, the through hole 3 is in a horizontal state. At this time, the two ends of the through hole 3 are connected to the water inlet pipe 4 and the drain pipe 5 respectively. The liquid discharged from the water inlet pipe 4 flows through the through hole 3 into the drain pipe 5.

[0027] When it is necessary to close the plug valve, turn the valve core 2 clockwise to rotate the valve core 2 ninety degrees, thereby misaligning the through hole 3 with the water inlet pipe 4 and the drain pipe 5.

[0028] During the clockwise rotation of valve core 2, inlet 7 gradually connects with inlet pipe 4. At this time, some of the fluid discharged from inlet pipe 4 enters buffer chamber 6, and the valve closes quickly, so the fluid cannot fill buffer chamber 6. Therefore, the fluid pressure entering buffer chamber 6 is insufficient to open pressure relief valve 8. Some fluid passes through through hole 3, which helps to prevent the impact force on valve core 2 from increasing, thereby preventing the friction between valve core 2 and valve body 1 from increasing and reducing the wear of valve core 2 and valve body 1.

[0029] When the stopcock valve is opened again, the valve core 2 is rotated counterclockwise, causing the valve core 2 to rotate 90 degrees until the through hole 3 is connected to the inlet pipe 4 and the drain pipe 5 again.

[0030] When the plug valve is opened, the fluid passes through the through hole 3. At this time, the fluid impacts the air cup 15, and the air cup 15 drives the threaded rod 11 to rotate forward through the rotating rod 14.

[0031] During the forward rotation of the threaded rod 11, the pressure plate 12 applies pressure to the air bladder 13. At this time, the gas in the air bladder 13 is discharged to the area below the push plate 9, and the air pressure below the push plate 9 increases, causing the push plate 9 to move towards the pressure relief valve 8. This allows the fluid in the buffer chamber 6 to be squeezed out through the pressure relief valve 8, preparing for the next operation.

[0032] The drive mechanism includes a pressurizing chamber 10 opened on the valve core 2, and a threaded rod 11 is vertically and rotatably inserted into the top wall of the pressurizing chamber 10; A pressure plate 12 is threadedly mounted on the threaded rod 11; a guide rod parallel to the threaded rod 11 is fixedly installed in the pressure chamber 10, and the pressure plate 12 is slidably sleeved on the guide rod to prevent the pressure plate 12 from rotating and to ensure that the pressure plate 12 only moves up and down along the threaded rod 11. An airbag 13 is installed between the pressure plate 12 and the bottom wall of the pressure chamber 10. The output end of the airbag 13 extends into the space below the push plate 9 in the buffer chamber 6, and the valve core 2 is provided with a rotating mechanism for driving the threaded rod 11 to rotate.

[0033] The rotating mechanism includes a rotating rod 14 that is vertically inserted into the through hole 3. The bottom end of the rotating rod 14 is fixedly connected to the top end of the threaded rod 11, and wind cups 15 are uniformly fixedly installed on the side wall of the rotating rod 14.

[0034] A spring 16 is installed between the threaded rod 11 and the side wall of the pressure chamber 10; when the threaded rod 11 rotates forward, the spring 16 stores power. The through hole 3 is a cuboid, and the rotating rod 14 is located at the upper left of the cross-section of the through hole 3. When the valve core 2 is rotated clockwise, the rotating rod 14 is misaligned with the water inlet pipe 4. At this time, the fluid discharged from the water inlet pipe 4 cannot directly impact the wind cup 15. Therefore, the impact force on the wind cup 15 is less than the elastic force of the spring 16. At this time, the spring 16 drives the threaded rod 11 to reverse, and the push plate 9 moves away from the pressure relief valve 8. Therefore, the space between the pressure relief valve 8 and the push plate 9 in the buffer chamber 6 gradually increases, ensuring that the fluid discharged from the water inlet pipe 4 can pass through the liquid inlet 7 and enter the buffer chamber 6.

[0035] The airbag 13 is made of elastic material. Therefore, when fluid enters the buffer chamber 6, the push plate 9 can be forced to move down under the action of fluid pressure. At this time, the elastic material airbag 13 expands, which ensures that the fluid discharged from the water inlet pipe 4 can enter the buffer chamber 6 normally.

[0036] like Figure 6 As shown, an installation rod 17 is fixedly installed on the inner wall of the through hole 3, and a filter screen 18 is installed on the installation rod 17.

[0037] The filter screen 18 includes a steel plate 1801 and holes 1802. The holes 1802 are evenly distributed on the surface of the steel plate 1801, and the closed figure formed by the extension line of the holes 1802, the extension line of the mounting rod 17 near the drain pipe 5, and the surface of the steel plate 1801 on the same horizontal plane is a right triangle.

[0038] During the rotation of valve core 2, under the action of mounting rod 17, the fluid flowing in through hole 3 will first pass through the hole 1802 on the surface of filter screen 18 and then impact the side wall of through hole 3. During the process of the fluid passing through filter screen 18, the kinetic energy of the fluid is converted into internal energy, which reduces the impact force of the fluid on the side wall of through hole 3, that is, reduces the impact force on valve core 2, and plays a role in reducing the friction between valve core 2 and valve body 1. At the same time, the inclined hole 1802 can change the flow direction of the fluid, further reducing the impact force of the fluid on the side wall of through hole 3 after passing through hole 1802.

[0039] like Figure 6 As shown, the filter screen 18 is movably sleeved on the mounting rod 17, and an elastic element 19 is installed between the filter screen 18 and the side wall of the through hole 3.

[0040] When the fluid impacts the filter screen 18, the elastic element 19 contracts, and the kinetic energy of the fluid is converted into the elastic potential energy of the elastic element 19, which further reduces the kinetic energy of the fluid, that is, reduces the friction between the valve core 2 and the valve body 1.

[0041] like Figure 6 As shown, the elastic element 19 has a cavity 20, and a pressure hole 21 is provided on the side wall of the cavity 20 near the drain pipe 5. When the front side of the filter screen 18 with holes 1802 is impacted by fluid, the elastic element 19 contracts, and the fluid in the cavity 20 is discharged through the pressurization hole 21.

[0042] The flow direction of the fluid discharged from the pressurizing hole 21 is parallel to the side wall of the through hole 3, and the fluid discharged from the pressurizing hole 21 impacts the fluid flowing towards the side wall of the through hole 3, thereby subjecting the fluid flowing towards the side wall of the through hole 3 to thrust.

[0043] This reduces the impact force of the fluid flowing towards the sidewall of the through hole 3 when it comes into contact with the sidewall of the through hole 3, and thus reduces the friction between the valve core 2 and the valve body 1.

[0044] like Figure 5 , Figure 6 As shown, the elastic element 19 is an elastic bellows, and the elastic bellows is sleeved on the mounting rod 17. When the elastic bellows is squeezed, it can contract in a specific direction to ensure that the fluid discharged from the pressurization hole 21 remains parallel to the side wall of the through hole 3.

[0045] Instructions for use: During normal operation, the through hole 3 is in a horizontal state. At this time, the two ends of the through hole 3 are connected to the water inlet pipe 4 and the drain pipe 5 respectively. The liquid discharged from the water inlet pipe 4 flows through the through hole 3 into the drain pipe 5.

[0046] When it is necessary to close the plug valve, turn the valve core 2 clockwise to rotate the valve core 2 ninety degrees, thereby misaligning the through hole 3 with the water inlet pipe 4 and the drain pipe 5.

[0047] During the clockwise rotation of valve core 2, inlet 7 gradually connects with inlet pipe 4. At this time, some of the fluid discharged from inlet pipe 4 enters buffer chamber 6, and the valve closes quickly, so the fluid cannot fill buffer chamber 6. Therefore, the fluid pressure entering buffer chamber 6 is insufficient to open pressure relief valve 8. Some fluid passes through through hole 3, which helps to prevent the impact force on valve core 2 from increasing, thereby preventing the friction between valve core 2 and valve body 1 from increasing and reducing the wear of valve core 2 and valve body 1.

[0048] When the stopcock valve is opened again, the valve core 2 is rotated counterclockwise, causing the valve core 2 to rotate 90 degrees until the through hole 3 is connected to the inlet pipe 4 and the drain pipe 5 again.

[0049] When the plug valve is opened, the fluid passes through the through hole 3. At this time, the fluid impacts the air cup 15, and the air cup 15 drives the threaded rod 11 to rotate forward through the rotating rod 14.

[0050] During the forward rotation of the threaded rod 11, the pressure plate 12 applies pressure to the air bladder 13. At this time, the gas in the air bladder 13 is discharged to the area below the push plate 9, and the air pressure below the push plate 9 increases, causing the push plate 9 to move towards the pressure relief valve 8. This allows the fluid in the buffer chamber 6 to be squeezed out through the pressure relief valve 8, preparing for the next operation.

[0051] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A plug valve for oilfield drilling and production square drill pipe, comprising a valve body (1); Its features are: The valve body (1) has a cavity, and a valve core (2) is rotatably inserted into the cavity. A through hole (3) is provided on the side wall of the valve core (2). Water inlet pipe (4) and water outlet pipe (5) are respectively inserted into the side walls on opposite sides of the cavity, and the extension lines of the water inlet pipe (4) and water outlet pipe (5) are located on the same straight line; The valve core (2) is provided with a buffer chamber (6), and the buffer chamber (6) is provided with an inlet (7) communicating with the cavity on the side wall near the water inlet pipe (4). The buffer chamber (6) is fixedly embedded with a pressure relief valve (8) whose output end is connected to the through hole (3). A push plate (9) is slidably installed inside the buffer chamber (6), and the push plate (9) is located below the pressure relief valve (8). The valve core (2) is provided with a drive mechanism for driving the push plate (9) to move. The drive mechanism includes a pressurizing chamber (10) opened on the valve core (2), and a threaded rod (11) is vertically and rotatably inserted into the top wall of the pressurizing chamber (10). A pressure plate (12) is threaded onto the threaded rod (11). An airbag (13) is installed between the pressure plate (12) and the bottom wall of the pressurization chamber (10). The output end of the airbag (13) extends into the space below the push plate (9) in the buffer chamber (6). The valve core (2) is provided with a rotating mechanism for driving the threaded rod (11) to rotate.

2. The oilfield drilling pipe plug valve according to claim 1, characterized in that: The rotating mechanism includes a rotating rod (14) that is vertically inserted into the through hole (3). The bottom end of the rotating rod (14) is fixedly connected to the top end of the threaded rod (11), and wind cups (15) are uniformly fixedly installed on the side wall of the rotating rod (14).

3. The oilfield drilling pipe plug valve according to claim 2, characterized in that: A spring (16) is installed between the threaded rod (11) and the side wall of the pressurizing chamber (10). The through hole (3) is a cuboid, and the rotating rod (14) is located on the upper left of the cross-section of the through hole (3).

4. The oilfield drilling pipe stop valve according to claim 3, characterized in that: The airbag (13) is made of an elastic material.

5. The oilfield drilling pipe plug valve according to claim 4, characterized in that: An installation rod (17) is fixedly installed on the inner wall of the through hole (3), and a filter screen (18) is installed on the installation rod (17).

6. The oilfield drilling pipe plug valve according to claim 5, characterized in that: The filter screen (18) includes a steel plate (1801) and holes (1802). The holes (1802) are evenly distributed on the surface of the steel plate (1801). The extension line of the holes (1802), the extension line of the mounting rod (17) near the drain pipe (5), and the surface of the steel plate (1801) form a closed figure of right triangle on the same horizontal plane.

7. The oilfield drilling pipe plug valve according to claim 6, characterized in that: The filter screen (18) is movably sleeved on the mounting rod (17), and an elastic element (19) is installed between the filter screen (18) and the side wall of the through hole (3).

8. The oilfield drilling pipe plug valve according to claim 7, characterized in that: The elastic element (19) has a cavity (20), and a pressure hole (21) is provided on the side wall of the cavity (20) near the drain pipe (5).

9. A plug valve for oilfield drilling and production square drill pipe according to claim 8, characterized in that: The elastic element (19) is an elastic bellows, and the elastic bellows is sleeved on the mounting rod (17).

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