Integral double-valve-core series structure super-high pressure throttling valve for oil drilling

Abstract

The application provides a petroleum drilling exploitation integrated double-valve-core series structure superhigh-pressure throttling valve, which comprises a valve body, at least two valve cavities in series are arranged in the valve body, a plurality of annular valve seats are vertically fixed and stacked in the valve cavities, a valve rod is vertically and slidably arranged in the valve seat, a plurality of valve cores are fixed and stacked on the valve rod, the valve core corresponds to the valve seat one by one, and there are annular gap throttling cone rings at both ends and a throttling cavity in the middle between the valve core and the valve seat, a synchronous driving two-valve-rod driving assembly is arranged at the top of the valve body, and the gap of the annular gap throttling cone ring corresponding to the valve rod is synchronously increased or decreased when the valve rod is synchronously driven, a valve cavity ring groove and a valve cavity counterbore which are communicated with the throttling cone ring and the throttling cavity are arranged at the top and the bottom of the valve cavity respectively, and the valve cavity ring groove and the valve cavity counterbore are used as the water inlet end or the water outlet end respectively. The application has the effects of improving the use pressure of the superhigh-pressure throttling valve and prolonging the service life of the valve rod and the valve core.

Description

Technical Field

[0001] This invention relates to the field of ultra-high pressure valve technology in oil drilling and development, and particularly to an integrated dual-valve-core series structure ultra-high pressure throttle valve for oil drilling and development. 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. Excessive pressure on the exposed side of the valve stem leads to easy seal failure and serious water leakage. 2. Excessive tensile stress on the valve stem can easily lead to breakage; 3. The original valve core fixing structure on the valve stem is prone to thread damage. The existence of the above problems has become a key factor restricting the structural development of the 200MPa ultra-high pressure throttle valve. In particular, the valve stem breakage problem, which can be 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 with an integral dual-valve-core series structure for oil drilling and development. By setting two ultra-high pressure throttle valves in series within a single valve body, the working pressure of each ultra-high pressure throttle valve is reduced, thereby solving the problems of valve stem breakage and damage to the fixing threads of the valve core on the valve stem in 200MPa ultra-high pressure throttle valves.

[0004] According to an embodiment of the present invention, an integrated dual-valve-core series structure ultra-high pressure throttling valve for oil drilling and extraction includes a valve body, which has at least two valve chambers connected in series. Several annular valve seats are vertically fixed and stacked in the valve chambers. A valve stem is vertically slidably arranged in the valve seat. Several valve cores are fixed and stacked on the valve stem. The valve cores correspond one-to-one with the valve seats. There are annular gap throttling cone rings at both ends and a throttling cavity in the middle between the valve cores and the valve seats. The top of the valve body is provided with a synchronously driving two valve stem driving assembly. When the valve stems are driven synchronously, the gap of the annular gap throttling cone rings corresponding to the valve stems increases or decreases synchronously. The driving assembly is provided with a throttling valve opening indicator. The top and bottom of the valve chambers are respectively provided with a valve chamber annular groove and a valve chamber countersunk hole communicating with the throttling cone ring and the throttling cavity. The valve chamber annular groove and the valve chamber countersunk hole serve as the water inlet end and the water outlet end, respectively.

[0005] Preferably, a valve cavity through hole for series connection is provided between two adjacent valve cavities. The valve cavity through hole connects two valve cavity annular grooves or one valve cavity annular groove and one valve cavity countersunk hole. The remaining two valve cavity countersunk holes are respectively connected to the inlet and outlet. Alternatively, the remaining valve cavity annular groove and valve cavity countersunk hole are respectively connected to the outlet and inlet. Both the outlet and inlet are in an inclined state.

[0006] Preferably, a valve seat pressure ring for limiting the valve seat inside the valve cavity is fixedly disposed in the valve cavity annular groove, an upper valve cover for fixing the valve seat pressure ring is installed on the top of the valve body, the valve stem passes through the valve seat pressure ring, and sealing rings for sealing the valve stem and the valve cavity annular groove are respectively provided on the inner and outer walls of the valve seat pressure ring, and a through hole for communicating the valve cavity annular groove and the throttling chamber is provided on the outer wall of the valve seat pressure ring.

[0007] Preferably, the valve seat pressure ring has sealing ring mounting grooves on both the inner and outer sides of its top, and ultra-high pressure sealing ring a and ultra-high pressure sealing ring b are respectively installed thereon, and ultra-high pressure sealing ring a and ultra-high pressure sealing ring b are respectively fixed by the upper valve cover through the inner sealing ring and the outer sealing ring.

[0008] Preferably, the bottom of the valve body is provided with a valve stem end support hole for accommodating the bottom end of the valve stem, and the bottom end of the valve stem is provided with a pressure relief hole communicating with the valve stem end support hole. The top end of the pressure relief hole is located on the outer wall of the valve stem, and the top end of the pressure relief hole is located at the bottom of the outer wall of the valve stem that is blocked. The bottom of the valve body is fixedly connected with a lower valve cover that seals the valve stem end support hole.

[0009] Preferably, a packing is provided in the support hole at the end of the valve stem, and a packing ring is provided on the top of the lower valve cover to fix the packing to the top of the support hole at the end of the valve stem. The outer wall of the bottom end of the valve stem is in contact with the packing and the inside of the packing ring.

[0010] Preferably, the drive assembly includes a mounting housing fixedly mounted on the upper valve cover, a turbine vertically rotatably mounted inside the mounting housing, a lead screw coaxially fixedly connected to the top end of the valve stem, the inner ring of the turbine threadedly connected to the lead screw, annular protrusions at both the top and bottom ends of the turbine and bearings rotatably connected to the annular protrusions, and a worm for synchronously driving the worm gears to rotate between the two worm gears, one end of the worm gear being connected to a drive motor and the other end being connected to the throttle valve opening indicator device.

[0011] Preferably, the two worm gears are located on opposite sides of the worm, and the valve cores on the two valve stems are installed in opposite directions. The valve core on one valve stem is installed facing forward, with an external thread at the bottom of the valve stem. The bottommost valve core has a threaded hole that mates with the external thread of the valve stem, and a locking nut is threadedly connected to the bottom of the valve stem, with the top of the locking nut abutting against the valve core. The valve core on the other valve stem is installed in reverse, with a threaded sleeve threadedly connected to the bottom of the valve stem. The top of the threaded sleeve abuts against the bottom of the bottom valve core, and a locking nut threadedly connected to the valve stem is located below the threaded sleeve.

[0012] Preferably, the worm gear is located on the same side of the two worm wheels, the valve cores on the two valve stems are installed in the same direction, the bottom of the valve stem is provided with an external thread, the bottommost valve core is provided with a threaded hole that mates with the external thread of the valve stem, and a locking nut is threadedly connected to the bottom end of the valve stem, with the top of the locking nut abutting against the valve core.

[0013] Preferably, the throttle valve opening indicator device includes a worm tail end seat fixedly mounted on the mounting housing. The worm and the worm tail end seat are coaxial, and the movable end of the worm extends into the worm tail end seat. A strip groove is formed on the opposite side wall of the worm tail end seat, and the strip groove is parallel to the worm tail end seat. A throttle valve opening indicator ring is threadedly connected to the movable end of the worm. A bolt is connected to the throttle valve opening indicator ring, and the movable end of the bolt is located in the strip groove. A position mark is provided on the strip groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By incorporating two tandem ultra-high pressure throttling valves within a single valve body, the operating pressure of each ultra-high pressure throttling valve is reduced, thereby solving the problems of valve stem breakage and damage to the fixing threads of the valve core on the valve stem in the 200MPa ultra-high pressure throttling valve. Furthermore, the inclined arrangement of the inlet and outlet, by altering the positions of the inlet and outlet of the ultra-high pressure throttling valve, reduces the pressure on the exposed side of the valve stem, thus resolving the water leakage problem caused by seal failure on the exposed side of the valve stem. The actual operating pressure of the integral dual-valve-core tandem ultra-high pressure throttling valve of this invention can exceed 200MPa. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the integrated dual-valve-core series structure ultra-high pressure throttle valve of Embodiment 1.

[0017] Figure 2 This is a schematic diagram of the valve body structure in Example 1.

[0018] Figure 3 This is a schematic diagram of the valve seat pressure ring structure.

[0019] Figure 4 This is a magnified schematic diagram of part A in Example 1.

[0020] Figure 5 This is a magnified schematic diagram of part B in Example 1.

[0021] Figure 6 This is a schematic diagram of the worm gear turbine arrangement structure in Example 1.

[0022] Figure 7 This is a side view of the integrated dual-valve-core series structure ultra-high pressure throttle valve in Embodiment 1.

[0023] Figure 8 This is a schematic diagram of the integrated dual-valve-core series structure ultra-high pressure throttle valve in Embodiment 2.

[0024] Figure 9 This is a schematic diagram of the worm gear turbine arrangement structure in Example 2.

[0025] Figure 10 This is a schematic diagram of the integrated dual-valve-core series structure ultra-high pressure throttle valve in Embodiment 3.

[0026] Figure 11 This is a schematic diagram of the valve body structure in Example 3.

[0027] Figure 12 This is a schematic diagram of the throttle valve opening indicator device.

[0028] In the diagram: 1. Valve body; 1.1. Inlet; 1.2. Valve cavity through hole; 1.3. Outlet; 1.4. Right valve cavity; 1.5. Left valve cavity; 1.6. Right valve cavity countersunk hole; 1.7. Left valve cavity countersunk hole; 1.8. Right valve stem end support hole; 1.9. Left valve stem end support hole; 1.10. Right valve cavity annular groove; 1.11. Left valve cavity annular groove; 2. Right valve stem; 2.1. Right valve core; 2.2. Valve core threaded sleeve; 2.3. Locking nut; 2.4. Right valve stem vent 3. Pressure hole; 4. Left valve stem; 5.1 Left valve core a; 6.2 Left valve core b; 7. Left valve stem pressure relief hole; 8. Right valve seat; 9. Left valve seat; 10. Lead screw; 11. Turbine; 12. Worm; 13. Upper valve cover; 14. Lower valve cover; 15. Valve seat pressure ring; 16. Outer sealing ring; 17. Inner sealing ring; 18. Ultra-high pressure combined seal; 19. Ultra-high pressure sealing ring a; 10. Ultra-high pressure sealing ring b; 11. Worm tail end seat; 22. Throttle valve opening indicator ring. Detailed Implementation

[0029] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Example 1:

[0031] This is an integrated dual-core tandem structure ultra-high pressure throttle valve for oil drilling and production, including valve body 1. See the instruction manual for details. Figure 2 The valve body 1 contains two valve chambers: a right valve chamber 1.4 and a left valve chamber 1.5. The lower parts of both chambers have countersunk holes 1.6 and 1.7, respectively. The lower parts of these countersunk holes 1.6 and 1.7 have connected right valve stem end support holes 1.8 and 1.9. Near the upper part of the right and left valve chambers 1.4 and 1.5, there are right valve chamber annular grooves 1.10 and 1.11, respectively, which are connected by a valve chamber through hole 1.2. The right valve chamber countersunk hole 1.6 has an inlet 1.1 on its sidewall, and the left valve chamber countersunk hole 1.7 has an outlet 1.3 on its sidewall.

[0032] Please refer to the instruction manual for details. Figure 1 , 3 4, 5: Four annular right valve seats 4 are stacked vertically in the right valve chamber 1.4. The top of the uppermost right valve seat 4 abuts against a valve seat pressure ring 13. Sixteen through holes are evenly distributed on the lower side wall of the valve seat pressure ring 13, communicating with the annular groove 1.10 of the right valve chamber. Four annular left valve seats 5 are stacked vertically in the left valve chamber 1.5. The top of the uppermost left valve seat 5 abuts against a valve seat pressure ring 13. Sixteen through holes on the lower side wall of the valve seat pressure ring 13 communicate with the annular groove 1.11 of the left valve chamber. The valve seat pressure ring 13 presses the right valve seat 4 and the left valve seat 5 together through the upper valve cover 11. A lower valve cover 12 is fixedly installed at the lower part of the valve body 1.

[0033] A right valve stem 2 and a left valve stem 3 are slidably disposed in the right valve seat 4 and left valve seat 5, respectively. The lower end of the right valve stem 2 is slidably disposed in the right valve stem end support hole 1.8, and the upper section of the right valve stem 2 is slidably disposed in the valve seat pressure ring 13, with the upper end extending to the outside of the upper valve cover 11. The lower end of the left valve stem 3 is slidably disposed in the left valve stem end support hole 1.9, and the upper section of the left valve stem 3 is slidably disposed in the valve seat pressure ring 13, with the upper end extending to the outside of the upper valve cover 11. Four annular right valve cores 2.1 are stacked vertically on the right valve stem 2 corresponding to the right valve seat 4. A valve core threaded sleeve 2.2 is provided at the lower part of the bottom right valve core 2.1. The valve core threaded sleeve 2.2 engages with the thread on the right valve stem 2, fixing the four right valve cores 2.1 on the right valve stem 2. A locking nut 2.3 is also provided at the lower part of the valve core threaded sleeve 2.2 to prevent the valve core threaded sleeve 2.2 from loosening. The four right valve cores 2.1 and the four right valve seats 4 are matched to form four annular slit throttling cone rings and throttling chambers. When the right valve stem 2 moves upward, the gap between the four annular slit throttling cone rings increases.

[0034] Three annular left valve cores A3.1 and one annular left valve core B3.2 are stacked vertically on the left valve stem 3, corresponding to the left valve seat 5. Left valve core B3.2 is located at the bottom and has a threaded inner hole. The thread of left valve core B3.2 engages with the thread on the left valve stem 3, fixing the three left valve cores A3.1 and itself onto the left valve stem 3. A locking nut 2.3 is also provided at the bottom of left valve core B3.2 to prevent it from loosening. The three left valve cores A3.1 and one left valve core B3.2 correspond to the four left valve seats 5, forming four annular slit throttling cone rings and throttling chambers. When the left valve stem 3 moves downwards, the gap between the four annular slit throttling cone rings increases.

[0035] See the instruction manual appendix Figure 4 An ultra-high pressure combined seal 16 is provided on the valve seat pressure ring 13. The ultra-high pressure combined seal 16 includes an ultra-high pressure sealing ring a17 disposed inside the valve seat pressure ring 13 and an ultra-high pressure sealing ring b18 disposed outside the valve seat pressure ring 13. The ultra-high pressure sealing ring a17 and the ultra-high pressure sealing ring b18 are then fixed and limited by the inner sealing ring 15 and the outer sealing ring 14, respectively.

[0036] See the instruction manual appendix Figure 1 , 6 The upper part of the upper valve cover 11 is fixedly connected to the valve stem drive box via a flange. A worm gear 10 is rotatably installed in the valve stem drive box. Turbines 7 are symmetrically arranged on both sides of the worm gear 10. A nut is fixedly installed in the middle of the turbines 7. A lead screw 6 is engaged in the nut. The two lead screws 6 are fixedly connected to the right valve stem 2 and the left valve stem 3 respectively via a clamp-type coupling.

[0037] See the instruction manual appendix Figure 7 , 12 One end of the worm gear 10 is fixedly connected to a drive motor, and the other end extends into the extended hole of the worm tail end seat 19. An external thread is provided on the outer circumference of the worm gear 10, and a throttle valve opening indicator ring 20 is provided on the external thread. Symmetrical through slots are provided on the sidewall of the extended hole of the worm tail end seat 19. A bolt is fixedly installed on one side of the outer circumference of the throttle valve opening indicator ring 20, with the bolt head positioned in the through slot on one side of the sidewall of the extended hole of the worm tail end seat 19. A position marking groove is provided on the other side of the outer circumference of the throttle valve opening indicator ring 20. The position marking groove mates with the position marking of the through slot on the other side of the sidewall of the extended hole of the worm tail end seat 19 to indicate the opening degree of the throttle valve.

[0038] To open the integrated dual-valve-core tandem ultra-high pressure throttle valve, the motor drives the worm gear 10 to rotate counterclockwise. The turbine 7 located to the left of the worm gear 10 rotates counterclockwise, while the turbine 7 located to the right of the worm gear 10 rotates clockwise simultaneously. When the turbine 7 on the left of the worm gear 10 rotates counterclockwise, the nut in the turbine 7 drives the lead screw 6 downwards, causing the left valve stem 3 to move downwards, gradually increasing the gap between the four annular slit throttling cone rings on the left side. Simultaneously, the turbine 7 on the right of the worm gear 10 rotates clockwise, and the nut in the turbine 7 drives the lead screw 6 upwards, causing the right valve stem 2 to move upwards, gradually increasing the gap between the four annular slit throttling cone rings on the right side, and gradually increasing the opening of the integrated dual-valve-core tandem ultra-high pressure throttle valve. To close the integrated dual-valve-core tandem ultra-high pressure throttle valve, the motor drives the worm gear 10 to rotate clockwise, causing the left valve stem 3 to move downwards and the right valve stem 2 to move upwards simultaneously, gradually decreasing the gap between the four annular slit throttling cone rings on both sides until the valve is closed.

[0039] When the worm 10 rotates, the bolt head on the throttle valve opening indicator ring 20 is stuck in the through 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.

[0040] See the instruction manual appendix Figure 4 , 5 The right valve stem 2 has a pressure relief hole 2.3 at its bottom end, and the left valve stem 3 has a pressure relief hole 3.4 at its bottom end. Figure 4 In the middle, when the right valve core 2.1 is installed upside down, the right valve stem pressure relief hole 2.3 is blocked by the valve core thread sleeve 2.2. When the right valve core 2.1 is subjected to a large upward force and shifts upward, the right valve stem pressure relief hole 2.3 is exposed and pressure is released. Figure 5 In the middle, when the left valve core 3.1 is installed upright, the top of the left valve stem pressure relief hole 3.4 is blocked by the lowest end of the left valve core 3.1. When the left valve core 3.1 is subjected to a large force and shifts upward, the left valve stem pressure relief hole 3.4 is exposed and pressure is released.

[0041] Example 2:

[0042] See the instruction manual appendix Figure 8 , 9 In this embodiment, the two turbines 7 are located on the same side of the worm gear 10. Therefore, when the worm gear 10 drives the two turbines 7 to rotate, the rotation directions of the two turbines 7 are the same, and the two valve stems move synchronously in the same direction. In this embodiment, the valve seat, valve core, and valve stem structures of the left and right ultra-high pressure throttle valves are completely identical, and the valve seat, valve core, and valve stem structures of the left or right ultra-high pressure throttle valves can be adopted.

[0043] Example 3:

[0044] See the instruction manual appendix Figure 10 , 11 In this embodiment, the inlet 1.1 is connected to the countersunk hole 1.6 of the right valve chamber. The annular groove 1.10 of the right valve chamber is connected to the countersunk hole 1.7 of the left valve chamber through the valve chamber through hole 1.2. The outlet 1.3 is connected to the annular groove 1.11 of the left valve chamber.

Claims

1. An integrated dual-valve-core series structure ultra-high pressure throttle valve for oil drilling and extraction, comprising a valve body (1), characterized in that: The valve body (1) is provided with at least two valve chambers connected in series. Several annular valve seats are vertically fixed and stacked in the valve chamber. A valve stem is vertically slidably arranged in the valve seat. Several valve cores are fixed and stacked on the valve stem. The valve cores correspond one-to-one with the valve seats. There are annular gap throttling cone rings at both ends and a throttling cavity in the middle between the valve cores and the valve seats. The top of the valve body (1) is provided with a synchronous driving assembly for two valve stems. When the valve stems are driven synchronously, the gap of the annular gap throttling cone rings corresponding to the valve stems increases or decreases synchronously. The driving assembly is provided with a throttling valve opening indicator. The top and bottom of the valve chamber are respectively provided with a valve chamber annular groove and a valve chamber countersunk hole that communicate with the throttling cone ring and the throttling cavity. The valve chamber annular groove and the valve chamber countersunk hole are respectively used as the inlet end or outlet end. A valve cavity through hole (1.2) for series connection is provided between two adjacent valve cavities. The valve cavity through hole (1.2) connects two valve cavity annular grooves or one valve cavity annular groove and one valve cavity countersunk hole. The remaining two valve cavity countersunk holes are respectively connected to the inlet (1.1) and the outlet (1.3), or the remaining valve cavity annular groove and valve cavity countersunk hole are respectively connected to the outlet (1.3) and the inlet (1.1). The outlet (1.3) and the inlet (1.1) are both in an inclined state. A valve seat pressure ring (13) for limiting the valve seat inside the valve cavity is fixedly installed in the valve cavity annular groove. An upper valve cover (11) for fixing the valve seat pressure ring (13) is installed on the top of the valve body (1). The valve stem passes through the valve seat pressure ring (13). Sealing rings for sealing the valve stem and the valve cavity annular groove are respectively provided on the inner and outer walls of the valve seat pressure ring (13). A through hole connecting the valve cavity annular groove and the throttling chamber is provided on the outer wall of the valve seat pressure ring (13).

2. The ultra-high pressure throttle valve with an integral dual-valve-core series structure for oil drilling and extraction as described in claim 1, characterized in that: The valve seat pressure ring (13) has sealing ring mounting grooves on its inner and outer sides, and ultra-high pressure sealing ring a (17) and ultra-high pressure sealing ring b (18) are respectively installed thereon. The ultra-high pressure sealing ring a (17) and ultra-high pressure sealing ring b (18) are respectively fixed by the upper valve cover (11) through the inner sealing ring (15) and the outer sealing ring (14).

3. The ultra-high pressure throttle valve with an integral dual-valve-core series structure for oil drilling and extraction as described in claim 1, characterized in that: The valve body (1) has a valve stem end support hole at the bottom for accommodating the bottom end of the valve stem. The bottom end of the valve stem has a pressure relief hole that communicates with the valve stem end support hole. The top of the pressure relief hole is located on the outer wall of the valve stem and the top of the pressure relief hole is located at the bottom of the outer wall of the valve stem that is blocked. The bottom of the valve body (1) is fixedly connected to a lower valve cover (12) that seals the valve stem end support hole.

4. The ultra-high pressure throttle valve with an integral dual-valve-core series structure for oil drilling and extraction as described in claim 3, characterized in that: A packing ring is provided in the support hole at the end of the valve stem, and a packing ring is provided on the top of the lower valve cover (12) to fix the packing ring to the top of the support hole at the end of the valve stem. The outer wall of the bottom end of the valve stem is in contact with the packing ring and the inside of the packing ring.

5. The ultra-high pressure throttle valve with an integral dual-valve-core series structure for oil drilling and extraction as described in claim 3, characterized in that: The drive assembly includes a mounting housing fixedly mounted on the upper valve cover (11). A turbine (7) is vertically rotatably mounted inside the mounting housing. A lead screw (6) is coaxially fixedly connected to the top end of the valve stem. The inner ring of the turbine (7) is threadedly connected to the lead screw (6). Both the top and bottom ends of the turbine (7) are provided with annular protrusions and bearings are rotatably connected through the annular protrusions. A worm (10) is provided between the two worm wheels (7) for synchronously driving the worm wheels (7) to rotate. One end of the worm (10) is connected to a drive motor, and the other end is connected to the throttle valve opening indicator device.

6. The ultra-high pressure throttle valve with an integral dual-valve-core series structure for oil drilling and extraction as described in claim 5, characterized in that: The two worm gears (7) are located on both sides of the worm (10). The valve cores on the two valve stems are installed in opposite directions. The valve core on one valve stem is installed facing forward. The bottom of the valve stem is provided with an external thread. The bottom valve core is provided with a threaded hole that mates with the external thread of the valve stem. The bottom end of the valve stem is threadedly connected to a locking nut (2.3). The top of the locking nut (2.3) abuts against the valve core. The valve core on the other valve stem is installed in reverse. The bottom of the valve stem is threadedly connected to a threaded sleeve (2.2). The top of the threaded sleeve (2.2) abuts against the bottom end of the bottom valve core. A locking nut (2.3) that is threadedly connected to the valve stem is also provided below the threaded sleeve.

7. The ultra-high pressure throttle valve with an integral dual-valve-core series structure for oil drilling and extraction as described in claim 5, characterized in that: The worm (10) is located on the same side of the two worm wheels (7), the valve cores on the two valve stems are installed in the same direction, the bottom of the valve stem is provided with an external thread, the bottom valve core is provided with a threaded hole that mates with the external thread of the valve stem, the bottom end of the valve stem is threadedly connected with a locking nut (2.3), and the top of the locking nut (2.3) abuts against the valve core.

8. The integrated dual-valve-core series structure ultra-high pressure throttle valve for oil drilling and production as described in any one of claims 5-7, characterized in that: The throttle valve opening indicator device includes a worm tail end seat (19) fixedly mounted on the mounting housing. The worm (10) is coaxial with the worm tail end seat (19), and the movable end of the worm (10) extends into the worm tail end seat (19). A strip groove is opened on the opposite side wall of the worm tail end seat (19), and the strip groove is parallel to the worm tail end seat (19). A throttle valve opening indicator ring (20) is threadedly connected to the movable end of the worm (10). A bolt is connected to the throttle valve opening indicator ring (20), and the movable end of the bolt is located in the strip groove. A position mark is provided on the strip groove.

Images