An ultra-high pressure throttling valve for oil drilling and exploitation

Abstract

The application provides an ultra-high pressure throttling valve for oil drilling and exploitation, which comprises a valve body, a valve cavity is arranged in the valve body, a valve cavity ring groove and a valve cavity sink groove are respectively communicated with the top end and the bottom end of the valve cavity, the valve cavity ring groove is communicated with an external water outlet pipeline through a downwardly inclined water outlet, the valve cavity sink groove is communicated with an external water inlet pipeline through an upwardly inclined water inlet, a valve rod is vertically slidably arranged in the valve cavity, a valve core is fixedly connected to the valve rod, a valve body is arranged in the valve cavity and cooperates with the valve core to form a continuous throttling cavity, the throttling cavity is communicated with the valve cavity ring groove and the valve cavity sink groove, a driving assembly for driving the valve rod to vertically slide is arranged at the top of the valve body, and an indicating assembly for indicating the opening degree of the throttling cavity is arranged in the driving assembly. The application has the effects of improving the stability of the use of the valve rod, prolonging the service life of the valve rod and solving the defect of easy leakage of the exposed valve rod.

Description

Technical Field

[0001] This invention relates to the field of ultra-high pressure valve technology for oil drilling and extraction, and particularly to an ultra-high pressure throttle valve for oil drilling and extraction. Background Technology

[0002] In fluid control equipment used in oilfield drilling and development, throttle valves are the main control components for pressure and flow. By adjusting the opening of the throttle valve, the purpose of controlling fluid pressure and flow can be achieved. With the increase in oil extraction depth, the pressure requirements of existing ultra-high pressure throttle valves used in oilfield drilling and development have reached as high as 200MPa. However, the previous design experience of ultra-high pressure throttle valve structures in China was 140MPa. When the structure of a 140MPa ultra-high pressure throttle valve is used for 200MPa, the following problems occur: 1. The exposed side of the valve stem is prone to sealing failure due to excessive pressure, resulting in serious water leakage. The problems are as follows: 1. Excessive tensile stress on the valve stem, which can easily lead to breakage; 2. The original valve core fixing structure on the valve stem is prone to thread damage. The existence of these problems has become a key factor restricting the development of the 200MPa ultra-high pressure throttle valve structure. In particular, the valve stem breakage problem, which is solved by increasing the valve stem diameter, will reduce the gap of the maximum annular slit throttling cone ring when the ultra-high pressure throttle valve is working, and solid particles in the ultra-high pressure fluid cannot pass through, making this method impossible to implement. Therefore, it has become a technical problem that must be overcome in the structural design of the 200MPa ultra-high pressure throttle valve. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an ultra-high pressure throttle valve for oil drilling and development, which solves the problems of easy sealing failure due to excessive pressure on the exposed side of the valve stem, easy breakage of the valve stem under tensile stress, and easy thread damage to the original valve core fixing structure on the valve stem.

[0004] According to an embodiment of the present invention, an ultra-high pressure throttling valve for oil drilling and development includes a valve body, a valve cavity is provided inside the valve body, a valve cavity annular groove and a valve cavity submerged groove are respectively connected to the top and bottom of the valve cavity, the valve cavity annular groove is connected to an external water outlet pipe through a downwardly inclined water outlet, the valve cavity submerged groove is connected to an external water inlet pipe through an upwardly inclined water inlet, a valve stem is vertically slidably arranged inside the valve cavity, a valve core is fixedly connected to the valve stem, a valve body is provided inside the valve cavity to cooperate with the valve core to form a continuous throttling cavity, the throttling cavity is connected to the valve cavity annular groove and the valve cavity submerged groove, a driving assembly for driving the valve stem to slide vertically is provided at the top of the valve body, and an indicator component for indicating the opening degree of the throttling cavity is provided in the driving assembly.

[0005] Preferably, the valve seat includes valve seat a and valve seat b, and the valve core includes valve core a and valve core b. Valve seat b and multiple valve seats a are stacked from bottom to top in the valve cavity. Valve core a and valve core b are arranged sequentially in valve seat a and valve seat b. An annular slit throttling cone ring and a throttling cavity are formed between valve seat a and valve core a and between valve seat b and valve core b. The bottom of valve seat b communicates with the groove of the valve cavity through a radial hole of valve seat b. A valve seat pressure ring is fixedly provided at the top of the valve body for pressing down and fixing the top valve seat a. The inner wall of the valve seat pressure ring is in contact with the outer wall of the valve stem. A valve seat pressure ring radial hole is opened at the bottom of the valve seat pressure ring for communicating with the annular groove of the valve cavity.

[0006] Preferably, the radial holes of the valve seat b are arranged at equal angles around the axis of the valve seat b, the radial holes of the valve seat b are arranged at an angle, and the bottom end of the radial holes of the valve seat b is connected to the interior of the valve seat b.

[0007] Preferably, an upper valve cover is fixedly provided on the top of the valve body for fixing and pressing down the valve seat pressure ring. The inner and outer side walls of the valve seat pressure ring near the upper valve cover are provided with annular grooves, and ultra-high pressure sealing rings a and b are respectively provided at the bottom of the annular grooves. An inner sealing ring and an outer sealing ring are respectively provided between the ultra-high pressure sealing rings a and b and the upper valve cover for pressing.

[0008] Preferably, the bottom of the valve body is provided with a valve stem end support hole communicating with the valve cavity annular groove, the bottom end of the valve stem is located in the valve stem end support hole, and a lower valve cover for sealing the valve stem end support hole is fixedly connected to the bottom of the valve body.

[0009] Preferably, a packing ring is provided between the valve stem and the valve stem end support hole, and a packing ring for pressing and fixing the packing ring is provided on the top of the lower valve cover.

[0010] Preferably, the bottom end of the valve body is provided with an annular groove, and a sealing ring is provided in the annular groove. The cross-section of the sealing ring is trapezoidal, and the large base of the trapezoid contacts the top surface of the lower valve cover.

[0011] Preferably, a connecting step is provided between the bottom of valve seat a and the top of valve seat b, and a sealing ring is provided at the joint of the connecting step. A connecting step is provided between the top of valve seat a and the bottom of valve seat a, and a sealing ring is provided at the joint of the connecting step.

[0012] Preferably, the drive assembly includes a mounting shell fixedly disposed on the top of the valve body, a worm gear and a turbine gear rotatably disposed within the mounting shell and connected in transmission, the turbine gear being vertically rotatably disposed, and bearings being rotatably connected to both the top and bottom ends of the turbine gear, the inner ring of the turbine gear being coaxially connected to the top end of the valve stem via a thread, and a motor being connected to one end of the worm gear in transmission.

[0013] Preferably, the indicating component includes a worm tail end seat fixedly connected to the side wall of the mounting housing. The opposite side wall of the worm tail end seat has a strip groove along the axial direction. The worm is parallel to the worm tail end seat. The movable end of the worm extends into the worm tail end seat and is provided with an external thread. A throttle valve opening indicator ring is threadedly connected to the throttle valve opening indicator ring. A bolt is connected to the opening indicator ring. The bolt is located in a strip groove, and a position mark is provided in the strip groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When it is necessary to open the ultra-high pressure throttle valve, the valve stem is driven vertically downward by the drive assembly. The valve stem drives the valve core to move relative to the valve seat, thereby increasing the throttle cavity and gradually increasing the opening degree of the ultra-high pressure throttle valve. When it is necessary to close the ultra-high pressure throttle valve, the valve stem is driven vertically upward by the drive assembly. The valve stem drives the valve core to move relative to the valve seat, thereby decreasing the throttle cavity and gradually decreasing the opening degree of the ultra-high pressure throttle valve.

[0015] 2. By changing the positions of the inlet and outlet of the original ultra-high pressure throttle valve, the stress state of the valve stem is changed, transforming the valve stem from a tensile stress state to a compressive stress state. This solves the problems of valve stem breakage due to excessive tensile force and thread damage to the valve core fixing structure on the valve stem.

[0016] 3. After changing the positions of the inlet and outlet, the pressure of the ultra-high pressure fluid on the exposed side of the valve stem is significantly reduced after being attenuated by the ultra-high pressure throttle valve, thus solving the problem of easy seal failure caused by excessive pressure on the exposed side of the valve stem; making the actual working pressure of the ultra-high pressure throttle valve exceed 200MPa.

[0017] 4. The bottom end of the valve stem is no longer directly in the liquid flow chamber, avoiding the impact of high-speed fluid on the valve stem axis, which could damage the valve stem drive thread and improve the stability of the valve stem drive. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the ultra-high pressure throttle valve structure in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the valve body structure in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of valve seat B in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the valve seat pressure ring structure in an embodiment of the present invention.

[0022] Figure 5 for Figure 1 Enlarged schematic diagram of part A in the middle.

[0023] Figure 6 This is a lateral schematic diagram of the ultra-high pressure throttle valve in an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the throttle valve opening indicator device in an embodiment of the present invention.

[0025] In the diagram: 1. Valve body; 1.1. Valve cavity; 1.2. Valve cavity annular groove; 1.3. Valve cavity countersunk hole; 1.4. Inlet; 1.5. Outlet; 1.6. Valve stem end support hole; 2. Valve seat a; 3. Valve seat b; 3.1. Valve seat b radial hole; 4. Valve stem; 5. Valve core a; 6. Valve core a; 7. Valve seat pressure ring; 7.1. Valve seat pressure ring radial hole; 8. Upper valve cover; 9. Worm gear; 10. Turbine gear; 11. Lower valve cover; 12. Outer sealing ring; 13. Inner sealing ring; 14. Ultra-high pressure sealing ring a; 15. Ultra-high pressure sealing ring b; 16. Guide seal; 17. Packing; 18. Packing ring; 19. Worm gear tail end seat; 20. Throttle valve opening indicator ring. Detailed Implementation

[0026] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1: An ultra-high pressure throttle valve for oil drilling and development includes a valve body 1, which is a rectangular block; for details, please refer to the appendix of the instruction manual. Figure 2 The valve body 1 has a valve cavity 1.1, a valve cavity countersunk hole 1.3 at the bottom of the valve cavity 1.1, a valve cavity annular groove 1.2 near the top of the valve cavity 1.1, an inlet 1.4 on the side wall of the valve cavity countersunk hole 1.3, and an outlet 1.5 on the side wall of the valve cavity annular groove 1.2. The outer ports of the inlet 1.4 and the outlet 1.5 are located on opposite sides of the valve body 1. The lower end face of the valve body 1 has a valve stem end support hole 1.6, and the valve stem end support hole 1.6 has a through hole that connects to the bottom of the valve cavity countersunk hole 1.3.

[0028] See the instruction manual appendix Figure 1 , 3 4, 5: In valve cavity 1.1, one annular valve seat B3 and six annular valve seats A2 are stacked sequentially from bottom to top. The top of the uppermost valve seat A2 is abutted against by a valve seat pressure ring 7. The lower side wall of the valve seat pressure ring 7 is evenly distributed with sixteen valve seat pressure ring radial holes 7.1, which communicate with the valve cavity annular groove 1.2. The valve seat pressure ring 7 presses the valve seat A2 and valve seat B3 together through the upper valve cover 8. The upper valve cover 8 is fixedly connected to the valve body 1 by bolts. The lower side wall of the lowermost annular valve seat B3 is evenly distributed with eight valve seat B radial holes 3.1, which communicate with the valve cavity countersunk hole 1.3. The lower end face of the valve body 1 is fixedly provided with a lower valve cover 11 by bolts.

[0029] A valve stem assembly is slidably disposed in valve seats A2 and B3. The valve stem assembly includes a valve stem 4, the lower end of which is slidably disposed in the valve stem end support hole 1.6, the upper middle section of which is slidably disposed in the valve seat pressure ring 7, and the uppermost end extending to the outside of the upper valve cover 11. Six annular valve cores A5 and one annular valve core B6 are stacked from top to bottom on the valve stem 4 corresponding to the valve seats A2 and B3. The inner hole of the valve core B6 is threaded, and the thread of the valve core B6 engages with the thread on the valve stem 4, fixing the six valve cores A5 and themselves on the valve stem 4. A locking nut is also provided at the lower part of the valve core B6 to prevent the valve core B6 from loosening during operation. The valve cores A5 and B6 engage with the valve seats A2 and B3 respectively to form seven annular slit throttling cone rings and throttling chambers. When the valve stem 4 moves downward, the gap between the four annular slit throttling cone rings increases.

[0030] See the instruction manual appendix Figure 1 The upper part of the valve cover 8 is fixedly connected to the valve stem drive box via a flange. The valve stem drive box contains a worm gear 9 and a turbine gear 10, which are rotatably mounted. The turbine gear 10 has an internal thread in the middle. The upper section of the valve stem 4 has an external thread on its outer surface, and the upper section of the valve stem 4 with the external thread is engaged in the internal thread hole of the turbine gear 10.

[0031] See the instruction manual appendix Figure 4 , 5 The valve seat pressure ring 7 has steps on both its inner and outer circumferential surfaces. An ultra-high pressure sealing ring A14 is located at the bottom of the inner circumferential step, and an ultra-high pressure sealing ring B15 is located at the bottom of the outer circumferential step. An inner sealing retaining ring 13 is positioned above the ultra-high pressure sealing ring A14, and an outer sealing retaining ring 12 is positioned above the ultra-high pressure sealing ring B15. The valve stem 4 extends to the outside of the valve body 1, achieving a double-ring sealing structure for the valve seat pressure ring 7 through the ultra-high pressure sealing rings A14 and B15. Additionally, an annular groove is provided on the inner circumferential surface of the inner sealing retaining ring 13, and a guide seal 16 is installed within the groove.

[0032] See the instruction manual appendix Figure 5 A packing ring 17 is provided in the valve stem end support hole 1.6 at the bottom of the valve body 1. The packing ring 17 is pressed by the packing ring 18. The middle part of the valve stem 4 is slidably supported by the guide seal 16, and the lower end of the valve stem 4 is slidably supported by the packing ring 17, realizing a double-support sliding structure.

[0033] See the instruction manual appendix Figure 6 , 7One end of the worm 9 is fixedly connected to a drive motor, and the other end extends into the extended hole of the worm tail end seat 19, with an external thread on its outer circumference. A throttle valve opening indicator ring 20 is installed on the external thread. The side wall of the extended hole of the worm tail end seat 19 has symmetrical strip grooves. A bolt is fixedly installed on one side of the outer circumference of the throttle valve opening indicator ring 20, with the bolt head set in the strip groove on one side of the side wall of the extended hole of the worm tail end seat 19. The other side of the outer circumference of the throttle valve opening indicator ring 20 has a position marking groove, which cooperates with the position marking of the strip groove on the other side of the side wall of the extended hole of the worm tail end seat 19 to indicate the opening of the throttle valve.

[0034] When the ultra-high pressure throttle valve needs to be opened, the motor drives the worm 9 to rotate counterclockwise, which in turn drives the turbine 10 to rotate counterclockwise. The thread in the turbine 10 drives the valve stem 4 to move downward, and the gap between the seven annular slit throttle cones gradually increases, thus gradually increasing the opening of the ultra-high pressure throttle valve. When the ultra-high pressure throttle valve needs to be closed, the motor drives the worm 9 to rotate clockwise, and the valve stem 4 moves upward. The gap between the seven annular slit throttle cones gradually decreases until it is closed.

[0035] When the worm 9 rotates, the bolt head on the throttle valve opening indicator ring 20 is stuck in the strip groove on the side wall of the extended hole of the worm tail end seat 19. Therefore, the throttle valve opening indicator ring 20 cannot rotate synchronously with the worm 10. As a result, the throttle valve opening indicator ring 20 moves linearly along the axis of the worm 10, thereby displaying the opening of the throttle valve.

Claims

1. An ultra-high pressure throttle valve for oil drilling and development, characterized in that: The valve body (1) includes a valve cavity (1.1) inside the valve body (1). The top and bottom ends of the valve cavity (1.1) are respectively connected to a valve cavity annular groove (1.2) and a valve cavity sink (1.3). The valve cavity annular groove (1.2) is connected to an external water outlet pipe through a downwardly inclined outlet (1.5). The valve cavity sink (1.3) is connected to an external water inlet pipe through an upwardly inclined inlet (1.4). A valve stem (4) is vertically slidably installed inside the valve cavity (1.1). A valve core is fixedly connected to the valve stem (4). A valve seat is provided inside the valve cavity (1.1) to cooperate with the valve core to form a continuous throttling cavity. The throttling cavity is connected to the valve cavity annular groove (1.2) and the valve cavity sink (1.3). A drive assembly for driving the valve stem (4) to slide vertically is provided on the top of the valve body (1). An indicator assembly for indicating the opening degree of the throttling cavity is provided in the drive assembly. The valve seat includes valve seat a (2) and valve seat b (3), and the valve core includes valve core a (5) and valve core b (6). Valve seat b (3) and multiple valve seats a (2) are stacked from bottom to top in the valve cavity (1.1). Valve core a (5) and valve core b (6) are arranged in sequence in the valve seat a (2) and valve seat b (3). Annular gaps are formed between valve seat a (2) and valve core a (5) and between valve seat b (3) and valve core b (6). The valve seat b (3) is connected to the valve cavity groove (1.3) through the valve seat b radial hole (3.1) at the bottom. The valve body (1) is fixedly provided with a valve seat pressure ring (7) for pressing down and fixing the top valve seat a (2). The inner wall of the valve seat pressure ring (7) is in contact with the outer wall of the valve stem (4). The bottom of the valve seat pressure ring (7) is provided with a valve seat pressure ring radial hole (7.1) for connecting the valve cavity annular groove (1.2). The bottom of the valve body (1) is provided with a valve stem end support hole (1.6) that communicates with the valve cavity groove (1.3). The bottom end of the valve stem (4) is located in the valve stem end support hole (1.6). The bottom of the valve body (1) is fixedly connected with a lower valve cover (11) for sealing the valve stem end support hole (1.6).

2. The ultra-high pressure throttle valve for oil drilling and development as described in claim 1, characterized in that: The radial hole (3.1) of the valve seat b is arranged at equal angles around the axis of the valve seat b (3), the radial hole (3.1) of the valve seat b is arranged at an angle, and the bottom end of the radial hole (3.1) of the valve seat b is connected to the interior of the valve seat b (3).

3. The ultra-high pressure throttle valve for oil drilling and development as described in claim 1, characterized in that: The valve body (1) is fixedly provided with an upper valve cover (8) for fixing and pressing down the valve seat pressure ring (7). The valve seat pressure ring (7) is provided with an annular groove on the inner and outer side walls of the end near the upper valve cover (8). The bottom of the annular groove is provided with an ultra-high pressure sealing ring a (14) and an ultra-high pressure sealing ring b (15). An inner sealing ring (13) and an outer sealing ring (12) for pressing are respectively provided between the ultra-high pressure sealing ring a (14) and the ultra-high pressure sealing ring b (15) and the upper valve cover (8).

4. The ultra-high pressure throttle valve for oil drilling and development as described in claim 1, characterized in that: A packing ring (17) is provided between the valve stem (4) and the valve stem end support hole (1.6), and a packing ring (18) for pressing and fixing the packing ring (17) is provided on the top of the lower valve cover (11).

5. The ultra-high pressure throttle valve for oil drilling and development as described in claim 4, characterized in that: The valve body (1) has an annular groove at its bottom end, and a sealing ring is provided in the annular groove. The sealing ring has a trapezoidal cross-section, and the large base of the trapezoid is in contact with the top surface of the lower valve cover (11).

6. The ultra-high pressure throttle valve for oil drilling and development as described in claim 1, characterized in that: A connecting step is provided between the bottom of valve seat a (2) and the top of valve seat b (3), and a sealing ring is provided at the joint of the connecting step. A connecting step is provided between the top of valve seat a (2) and the bottom of valve seat a (2), and a sealing ring is provided at the joint of the connecting step.

7. The ultra-high pressure throttle valve for oil drilling and development as described in claim 1, characterized in that: The drive assembly includes a mounting shell fixedly installed on the top of the valve body (1). A worm gear (9) and a worm wheel (10) are rotatably connected inside the mounting shell. The worm wheel (10) is rotatably installed vertically, and bearings are rotatably connected to both the top and bottom ends of the worm wheel (10). The inner ring of the worm wheel (10) is coaxially connected to the top end of the valve stem (4) via a thread. A motor is rotatably connected to one end of the worm gear (9).

8. The ultra-high pressure throttle valve for oil drilling and development as described in claim 7, characterized in that: The indicating component includes a worm tail end seat (19) fixedly connected to the side wall of the mounting housing. The opposite side wall of the worm tail end seat (19) is provided with a strip groove along the axial direction. The worm (9) is parallel to the worm tail end seat (19). The movable end of the worm (9) extends into the worm tail end seat (19) and is provided with an external thread. A throttle valve opening indicator ring (20) is threadedly connected to it. A bolt is connected to the opening indicator ring (20). The bolt is located in a strip groove, and a position mark is provided in the strip groove.

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