A choke valve for a wellhead Christmas tree
By designing the rotating shaft and cone plate structure of the wellhead tree throttle valve, the graded throttling control and automatic cleaning of crude oil flow were realized, solving the problems of decreased accuracy and cumbersome maintenance of existing wellhead tree throttle valves, and improving the efficiency and safety of oil production operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-20
- Publication Date
- 2026-08-04
AI Technical Summary
After long-term use, existing wellhead production tree throttle valves are prone to crude oil condensation, waxing, or adhesion and solidification on the valve core surface, resulting in lagging opening control, reduced throttle adjustment accuracy, cumbersome maintenance procedures, affecting the accuracy and stability of oil production operations, and time-consuming and labor-intensive routine maintenance, leading to reduced production efficiency.
A wellhead production tree throttle valve was designed. The base plate and positioning frame are raised and lowered by rotating the shaft, which can adjust the number of insertions between the positioning frame and the fixing groove. Combined with the scraping function of the cone plate, it can automatically remove the attached crude oil. The motor drives the gear and rack ring to drive the shuttle block for multi-stage automatic cleaning, which simplifies the maintenance process and allows adjustment and replacement without closing the main valve.
It enables graded throttling control of crude oil flow, improves regulation accuracy and stability, simplifies maintenance procedures, reduces downtime and labor costs, enhances the efficiency and reliability of oil production operations, and ensures the continuity and safety of oil production operations.
Smart Images
Figure CN122215679B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of throttle valve technology, specifically a wellhead tree throttle valve. Background Technology
[0002] The wellhead, an indispensable wellhead device for both flowing and mechanically operated wells, stands firmly at the top of the oil and gas well and is the core equipment for controlling and regulating oil and gas production. Among them, the wellhead wellhead choke valve is particularly critical, as it is an essential component of the wellhead and manifold, controlling the wellhead's production output.
[0003] A patent with publication number CN115573683A discloses a wellhead tree throttle valve, including a valve body, a valve core, a first spring, a limiting rod, a rotating wheel, a shifting gear, and a flow guiding assembly. The rotating wheel is disposed in a receiving groove and is rotatably connected to the valve core. The rotating wheel has multiple first through holes with sequentially increasing inner diameters; the first through holes can connect the inlet and outlet; the outer contour of the rotating wheel has teeth; the shifting gear is disposed in the receiving groove and is located on the upper side of the rotating wheel, meshing with the rotating wheel; the flow guiding assembly is located between the rotating wheel and the inlet, and the first through holes are connected to the inlet through the flow guiding assembly.
[0004] However, in practical applications, existing throttle valves for production trees typically adjust and control oil production by changing the cross-sectional area of the main channel through relative movement of the throttle valve core. However, during long-term use, a large amount of crude oil tends to adhere to the surface of the throttle valve core. Due to the high viscosity of crude oil, after the oil production operation is completed, the crude oil on the valve core surface is prone to condensation, waxing, or adhesion and solidification. This results in a lag in the opening control and a decrease in the throttle adjustment accuracy when the throttle valve is restarted, which in turn causes deviations in the flow control of the production tree and affects the accuracy and stability of the oil production operation. In addition, the existing replacement and maintenance process of the throttle valve core is cumbersome. The conventional operation requires first closing the main pipeline valve and then disassembling and replacing the valve core. After the main valve is closed, crude oil will remain inside the valve and pipeline. If it is not cleaned in time, it can easily cause pipeline blockage or subsequent abnormal start-up. The entire maintenance process is not only time-consuming and labor-intensive with high labor costs, but it can also lead to the interruption of oil production operations, greatly reduce extraction efficiency, and cause great inconvenience to the oil extraction site.
[0005] Therefore, the present invention provides a wellhead tree throttling valve. Summary of the Invention
[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.
[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A wellhead production tree throttling valve of the present invention includes a valve body, a rotating shaft rotatably disposed above the valve body, a base plate fixedly connected to the bottom end of the rotating shaft, a valve cavity opened inside the valve body, a guide frame fixedly connected inside the valve cavity, a positioning plate fixedly connected to the top of the guide frame, a fixing groove opened on the surface of the positioning plate, a sealing element provided on the lower surface of the positioning plate, the sealing element being used to seal the fixing groove, a plurality of guide grooves opened on the lower surface of the base plate, a plurality of positioning frames fixedly connected to the lower surface of the base plate, the positioning frames being stepped and increasing in size; a disassembly assembly is provided on the upper surface of the positioning frame, the disassembly assembly being used to disassemble and replace the positioning frame.
[0008] Preferably, the sealing element includes a plurality of positioning grooves formed on the lower surface of the positioning plate, and a positioning spring is fixedly connected in each positioning groove. One end of the positioning spring is fixedly connected to a conical plate. The cross-section of the conical plate is a right trapezoid. Two conical plates are combined to form a sealing element to seal the fixing groove.
[0009] Preferably, the tips of the two cone plates abut in an arc shape, and the tips of the two cone plates are capable of scraping the positioning frame.
[0010] Preferably, a sealing block is fixed to one side of one of the cone plates, and a sealing frame is fixed to one side of the other cone plate. The sealing block can be inserted into the sealing frame, and the sealing block and the sealing frame simultaneously seal the positioning groove. An auxiliary block is fixed to the cone plates on both sides of the positioning plate, and the auxiliary block seals its corresponding positioning groove.
[0011] Preferably, a rack ring is rotatably provided inside the guide frame, a fixing plate is fixedly connected to one side of the guide frame, a motor is fixedly connected to the top of the fixing plate, a first gear is fixedly connected to the output end of the motor, the first gear meshes with a second gear, the second gear meshes with the rack ring, and two spindle-shaped blocks are fixedly connected to the inner wall of the rack ring. The two spindle-shaped blocks are staggered and mirror-symmetrical, and the two spindle-shaped blocks can process the bottom surface of the conical plate.
[0012] Preferably, the disassembly assembly includes several limiting grooves opened on the lower surface of the base plate, several auxiliary springs are fixedly connected inside each limiting groove, one end of the several auxiliary springs is fixedly connected to the same auxiliary strip, two sets of guide blocks are fixedly connected to the top of the positioning frame, and an auxiliary groove is opened on one side of each guide block, and the auxiliary strip can be inserted into the auxiliary groove.
[0013] Preferably, the end of the auxiliary strip is convex, the auxiliary groove can engage the auxiliary strip, and the end of the auxiliary strip is made of magnetic material that can magnetically attract the guide block.
[0014] Preferably, when using the throttle valve, the base plate is first driven to move downward by rotating the rotating shaft. The downward movement of the base plate drives the positioning frames on its lower surface to engage with the fixing slots one by one. Then, the conical plates are squeezed to move to both sides, thereby opening the channel and allowing crude oil to flow. When a large flow rate is required, the rotating shaft is driven to continue rotating, opening the flow between multiple positioning frames and fixing slots, thereby achieving a throttling effect. During the oil extraction process, the tips of both conical plates abut against the outer wall of the positioning frames. After the oil extraction work is completed, the rotating shaft is driven to retract the positioning frames. During the retraction process, the tips of the conical plates scrape the outer wall of the positioning frames.
[0015] Preferably, during the process of the cone plates being squeezed open, one cone plate will simultaneously drive the sealing block on its side, and the other cone plate will drive the sealing frame on its side. The sealing block and the sealing frame are initially in an inserted state. The movement of the cone plates causes the sealing block and the sealing frame to slide and insert, simultaneously maintaining the sealing operation of the positioning groove.
[0016] Preferably, after the oil extraction work is completed, the rotating shaft drives the bottom plate to retract, causing the positioning frame to reset. At this time, the cone plate is released from compression, and the two cone plates reset under the reset force of the positioning spring, so that the positioning plate seals the main pipeline. Then, the motor at the top of the fixed plate is started. The motor drives the first gear to rotate, the first gear drives the second gear to rotate, and the second gear drives the rack ring to rotate. The rotation of the rack ring drives the shuttle block fixed to its inner wall. The shuttle block rotates and cleans the crude oil on the bottom surface of the cone plate. When the positioning frame is retracted, the cone plate will scrape the crude oil on the side of the positioning frame. Therefore, the shuttle block completes the processing of the cone plate. At the same time, the rotating shaft can be removed. The removal of the rotating shaft is the disassembly of the positioning frame. After the oil extraction work is completed, crude oil will be attached to the inner wall of the positioning frame. By pulling down the positioning frame, the guide block at the top of the positioning frame is disengaged from the auxiliary strip, releasing the auxiliary strip from the positioning frame. Then, the positioning frame is replaced.
[0017] The beneficial effects of this invention are as follows: 1. The wellhead production tree throttling valve of the present invention drives the base plate and positioning frame to rise and fall through a rotating shaft, which can control the number of insertions between the positioning frame and the fixing slot, and adjust the number of openings of the fixing slot step by step to achieve graded throttling control of crude oil flow. The adjustment is more stable and more accurate. During the oil production process, the tip of the cone plate is always pressed against the outer wall of the positioning frame. When the positioning frame is retracted at the end of the oil production, the tip of the cone plate can simultaneously form a scraping action on the outer wall of the positioning frame, automatically removing the attached crude oil, gum and condensate, preventing the crude oil from cooling and solidifying and blocking the channel, ensuring smooth operation of the throttling valve. At the same time, this structure can be adjusted and maintained without closing the main valve, simplifying the operation process, reducing downtime, and significantly improving the efficiency of oil production operations and equipment reliability.
[0018] 2. The wellhead production tree throttle valve of this invention achieves multi-stage automatic cleaning and convenient maintenance after oil production. When the positioning frame resets, the cone plate closes and seals the main pipeline under the action of the positioning spring. At the same time, the cone plate pre-scrapes the crude oil on the outer wall of the positioning frame, reducing adhesion residue. Then, the motor drives the gear and rack ring to rotate the shuttle block, which can scrape off the crude oil and gum adhering to the bottom surface of the cone plate, preventing the two cone plates from sticking together and making subsequent opening difficult. In addition, the positioning frame is assembled by a guide block and auxiliary strip snap-fit, which eliminates the need to close the main valve or drain the pipeline residual oil. It can be quickly disassembled and replaced by simply pulling down, greatly simplifying the disassembly and assembly process. The overall structure realizes the integration of scraping, rotation cleaning, and quick replacement, effectively avoiding residual oil leakage and pipeline blockage, reducing downtime and labor costs, improving the service life of the throttle valve and the continuity of oil production operations, and significantly improving safety and work efficiency. Attached Figure Description
[0019] The invention will now be further described with reference to the accompanying drawings.
[0020] Figure 1 This is a perspective view of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the valve body of the present invention; Figure 3 This is a cross-sectional view of the valve body of the present invention; Figure 4 This is a cross-sectional view of the adjustment component of the present invention; Figure 5 This is a cross-sectional view of the base plate and positioning plate of the present invention; Figure 6 This is a schematic diagram of the disassembly component of the present invention; Figure 7 This is a schematic diagram of the disassembly structure of the disassembly component of the present invention; Figure 8 This is a schematic diagram of the structure of the processing component of the present invention; Figure 9 This is a bottom view of the processing component of the present invention; In the diagram: 1. Valve body; 11. Rotating shaft; 12. Valve chamber; 13. Base plate; 14. Guide frame; 15. Fixing plate; 16. Positioning plate; 17. Fixing groove; 18. Conical plate; 19. Positioning groove; 110. Positioning spring; 111. Spindle-shaped block; 112. Sealing block; 113. Sealing frame; 114. Auxiliary block; 2. Positioning frame; 21. Guide groove; 22. Guide block; 23. Auxiliary groove; 24. Auxiliary strip; 25. Auxiliary spring; 26. Limiting groove; 3. Motor; 31. First gear; 32. Second gear; 33. Rack and pinion ring. Detailed Implementation
[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.
[0022] Example 1: As Figures 1 to 9 As shown in the embodiment of the present invention, a wellhead production tree throttle valve has a rotating shaft 11 rotatably mounted on the top of the valve body 1. A base plate 13 is fixedly connected to the bottom end of the rotating shaft 11. A valve cavity 12 is formed inside the valve body 1. A guide frame 14 is fixedly connected inside the valve cavity 12. A positioning plate 16 is fixedly connected to the top of the guide frame 14. A fixing groove 17 is formed on the surface of the positioning plate 16. A sealing element is provided on the lower surface of the positioning plate 16 to seal the fixing groove 17. A plurality of guide grooves 21 are formed on the lower surface of the base plate 13, and a plurality of positioning frames 21 are fixedly connected to the lower surface of the base plate 13. The positioning frame 2 grows in a stepped manner; a disassembly assembly is provided on the upper surface of the positioning frame 2, which is used to disassemble and replace the positioning frame 2; the sealing element includes several positioning grooves 19 formed on the lower surface of the positioning plate 16, and a positioning spring 110 is fixedly connected in each positioning groove 19. One end of the positioning spring 110 is fixedly connected to a conical plate 18. The cross section of the conical plate 18 is a right trapezoid. Two conical plates 18 are combined to form a sealing element to seal the fixing groove 17; the tips of the two conical plates 18 abut in an arc shape, and the tips of the two conical plates 18 can scrape the positioning frame 2.
[0023] Specifically, in practical applications, existing throttle valves for wellheads typically adjust and control oil production by changing the cross-sectional area of the main channel through relative movement of the throttle valve core. However, during long-term use, a large amount of crude oil tends to adhere to the surface of the throttle valve core. Due to the high viscosity of crude oil, after the oil production operation is completed, the crude oil on the valve core surface is prone to condensation, waxing, or adhesion and solidification. This results in a lag in the opening control and a decrease in the throttle adjustment accuracy when the throttle valve is restarted, which in turn causes deviations in the flow control of the wellhead and affects the accuracy and stability of the oil production operation. In addition, the existing replacement and maintenance process of the throttle valve core is cumbersome. The conventional operation requires first closing the main pipeline valve and then disassembling and replacing the valve core. After the main valve is closed, crude oil will remain inside the valve and pipeline. If it is not cleaned in time, it can easily cause pipeline blockage or subsequent abnormal start-up. The entire maintenance process is not only time-consuming and labor-intensive with high labor costs, but it can also lead to the interruption of oil production operations, greatly reduce extraction efficiency, and cause great inconvenience to the oil extraction site. Therefore, the present invention sets up the above structure according to the above problems. First, when using the throttle valve, the base plate 13 is driven to move down by rotating the rotating shaft 11. The downward movement of the base plate 13 drives the positioning frames 2 on its lower surface to be inserted into the fixing grooves 17 one by one. Then, the extrusion cone plate 18 is moved to both sides, thereby opening the channel and allowing crude oil to flow. When a large flow rate is required, the rotating shaft 11 is driven to rotate, opening the flow between multiple positioning frames 2 and fixing grooves 17, thereby achieving the throttling effect. During the oil extraction process, the tips of the two cone plates 18 are in contact with the outer wall of the positioning frame 2. When the oil extraction work is completed, the rotating shaft is driven to retract the positioning frame 2. During the retraction process, the tips of the cone plates 18 scrape the outer wall of the positioning frame 2. The base plate 13 and the positioning frame 2 are raised and lowered by rotating the shaft 11, which can control the number of insertions between the positioning frame 2 and the fixed groove 17 and adjust the number of openings of the fixed groove 17 step by step to achieve graded throttling control of crude oil flow. The adjustment is more stable and more accurate. During the oil production process, the tip of the cone plate 18 is always pressed against the outer wall of the positioning frame 2. When the positioning frame 2 is retracted at the end of the oil production, the tip of the cone plate 18 can simultaneously form a scraping action on the outer wall of the positioning frame 2, automatically removing the attached crude oil, gum and condensate, preventing the crude oil from cooling and solidifying and blocking the channel, ensuring the smooth operation of the throttling valve. At the same time, this structure can be adjusted and maintained without closing the main valve, simplifying the operation process, reducing downtime, and significantly improving the efficiency of oil production and the reliability of equipment.
[0024] Example 2: Figures 1 to 9 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a sealing block 112 is fixedly connected to one side of one conical plate 18, and a sealing frame 113 is fixedly connected to one side of the other conical plate 18. The sealing block 112 can be inserted into the sealing frame 113, and the sealing block 112 and the sealing frame 113 simultaneously seal the positioning groove 19. An auxiliary block 114 is fixedly connected to each of the conical plates 18 on both sides of the positioning plate 16, and the auxiliary block 114 seals its corresponding positioning groove 19. Specifically, during the process of the cone plate 18 being squeezed open, one cone plate 18 will simultaneously drive the sealing block 112 on its side, and the other cone plate 18 will drive the sealing frame 113 on its side. The sealing block 112 and the sealing frame 113 are initially in an inserted state. The movement of the cone plate 18 causes the sealing block 112 and the sealing frame 113 to slide and insert, simultaneously maintaining the sealing operation of the positioning groove 19. During the process of the cone plate 18 being squeezed open, the sealing block 112 and the sealing frame 113 can move synchronously. The two always maintain a sliding insertion fit and can adaptively adjust in real time according to the change of the opening of the cone plate 18, always forming a seal on the positioning groove 19, effectively preventing crude oil from leaking from the gap. The sealing block 112 and the sealing frame 113 are initially in the insertion state, and there is no misalignment or gap during the movement process. The sealing performance is stable and reliable, which improves the overall sealing performance and service life of the throttle valve and ensures the safe and stable operation of oil production.
[0025] like Figure 8 and Figure 9 As shown, in this embodiment, a rack ring 33 is rotatably arranged inside the guide frame 14. A fixing plate 15 is fixedly connected to one side of the guide frame 14, and a motor 3 is fixedly connected to the top of the fixing plate 15. A first gear 31 is fixedly connected to the output end of the motor 3. The first gear 31 meshes with a second gear 32, and the second gear 32 meshes with the rack ring 33. Two shuttle-shaped blocks 111 are fixedly connected to the inner wall of the rack ring 33. The two shuttle-shaped blocks 111 are staggered and mirror-symmetrical. The two shuttle-shaped blocks 111 can process the bottom surface of the cone plate 18; disassembly component package. The bottom plate 13 has several limiting grooves 26 on its lower surface. Each limiting groove 26 has several auxiliary springs 25 fixed inside it. One end of each auxiliary spring 25 is fixed to the same auxiliary strip 24. The top of the positioning frame 2 has two sets of guide blocks 22 fixed to it. Each guide block 22 has an auxiliary groove 23 on one side. The auxiliary strip 24 can be inserted into the auxiliary groove 23. The end of the auxiliary strip 24 is convex and the auxiliary groove 23 can engage the auxiliary strip 24. The end of the auxiliary strip 24 is made of magnetic material and can magnetically attract the guide block 22.
[0026] Specifically, after the oil extraction work is completed, the rotating shaft 11 drives the bottom plate 13 to retract, causing the positioning frame 2 to reset. At this time, the cone plate 18 is released from compression, and the two cone plates 18 are reset under the reset force of the positioning spring 110, so that the positioning plate 16 seals the main pipeline. Then, the motor 3 at the top of the fixed plate 15 is started. The motor 3 drives the first gear 31 to rotate, the first gear 31 drives the second gear 32 to rotate, and the second gear 32 drives the rack ring 33 to rotate. The rotation of the rack ring 33 drives the spindle block 111 fixed to its inner wall to rotate. The cone plate 18 is moved to clean the crude oil on the bottom surface of the cone plate 18. When the positioning frame 2 is retracted, the cone plate 18 will scrape the crude oil on the side of the positioning frame 2. Therefore, the shuttle block 111 completes the processing of the cone plate 18. At the same time, the rotating shaft 11 can be removed. The removal of the rotating shaft 11 is the disassembly of the positioning frame 2. After the oil extraction work is completed, crude oil will be attached to the inner wall of the positioning frame 2. By pulling the positioning frame 2 down, the guide block 22 at the top of the positioning frame 2 is disengaged from the auxiliary strip 24, the auxiliary strip 24 is released from the locking of the positioning frame 2, and then the positioning frame 2 is replaced. By achieving multi-stage automatic cleaning and convenient maintenance after oil extraction, when the positioning frame 2 is reset, the cone plate 18 closes and seals the main pipeline under the action of the positioning spring 110. At the same time, the cone plate 18 pre-scrapes the crude oil on the outer wall of the positioning frame 2 to reduce adhesion residue. Then, the motor 3 drives the gear and rack ring 33 to drive the shuttle block 111 to rotate, which can scrape off the crude oil and gum attached to the bottom surface of the cone plate 18, preventing the two cone plates 18 from sticking together and making it difficult to open later. In addition, the positioning frame 2 is assembled by snapping together with the guide block 22 and the auxiliary strip 24. There is no need to close the main valve or drain the residual oil in the pipeline. The snapping can be quickly released and the replacement can be done simply by pulling it down. This greatly simplifies the disassembly and assembly process. The overall structure realizes the integration of scraping, rotation cleaning and quick replacement, effectively avoiding residual oil leakage and pipeline blockage, reducing downtime and labor costs, improving the service life of the throttle valve and the continuity of oil production operations, and significantly improving safety and work efficiency.
[0027] Working principle: When using the throttle valve, the base plate 13 is driven to move downward by rotating the rotating shaft 11. The downward movement of the base plate 13 drives the positioning frames 2 on its lower surface to insert into the fixing grooves 17 one by one. Then, the cone plates 18 are squeezed to move to both sides, thereby opening the channel and allowing crude oil to flow. When a large flow rate is required, the rotating shaft 11 is driven to rotate, opening the flow between multiple positioning frames 2 and fixing grooves 17, thereby achieving the throttling effect. During the oil extraction process, the tips of the two cone plates 18 abut against the outer wall of the positioning frames 2. After the oil extraction work is completed, the rotating shaft is driven to retract the positioning frames 2. During the retraction process, the tips of the cone plates 18 scrape the outer wall of the positioning frames 2. The base plate 13 and the positioning frame 2 are raised and lowered by rotating the shaft 11, which can control the number of insertions between the positioning frame 2 and the fixing groove 17 and adjust the number of openings of the fixing groove 17 step by step to achieve graded throttling control of crude oil flow. The adjustment is more stable and more accurate. During the oil production process, the tip of the cone plate 18 is always pressed against the outer wall of the positioning frame 2. When the positioning frame 2 is retracted at the end of the oil production, the tip of the cone plate 18 can simultaneously form a scraping action on the outer wall of the positioning frame 2, automatically removing the attached crude oil, gum and condensate, preventing the crude oil from cooling and solidifying and blocking the channel, ensuring the smooth operation of the throttling valve. At the same time, this structure can be adjusted and maintained without closing the main valve, simplifying the operation process, reducing downtime, and significantly improving the efficiency of oil production and equipment reliability. During the process of the cone plate 18 being squeezed open, one cone plate 18 will simultaneously drive the sealing block 112 on its side, and the other cone plate 18 will drive the sealing frame 113 on its side. The sealing block 112 and the sealing frame 113 are initially in the insertion state. The movement of the cone plate 18 causes the sealing block 112 and the sealing frame 113 to slide and insert, simultaneously maintaining the sealing work of the positioning groove 19. During the process of the cone plate 18 being squeezed open, the sealing block 112 and the sealing frame 113 can move synchronously. The two always maintain a sliding insertion fit and can adaptively adjust in real time according to the change of the opening of the cone plate 18, always forming a seal on the positioning groove 19, effectively preventing crude oil from leaking from the gap. The sealing block 112 and the sealing frame 113 are initially in the insertion state, and there is no misalignment or gap during the movement process. The sealing performance is stable and reliable, which improves the overall sealing performance and service life of the throttle valve and ensures the safe and stable operation of oil production. Finally, after the oil extraction work is completed, the rotating shaft 11 drives the bottom plate 13 to retract, causing the positioning frame 2 to reset. At this time, the cone plate 18 is released from compression, and the two cone plates 18 are reset under the reset force of the positioning spring 110, so that the positioning plate 16 seals the main pipeline. Then, the motor 3 at the top of the fixed plate 15 is started again. The motor 3 drives the first gear 31 to rotate, the first gear 31 drives the second gear 32 to rotate, and the second gear 32 drives the rack ring 33 to rotate. The rotation of the rack ring 33 drives the spindle block 111 fixed to its inner wall to rotate. The crude oil on the bottom surface of the cone plate 18 is cleaned. When the positioning frame 2 is retracted, the cone plate 18 will scrape off the crude oil on the side of the positioning frame 2. Therefore, the shuttle block 111 completes the processing of the cone plate 18. At the same time, the rotating shaft 11 can be removed. The removal of the rotating shaft 11 is the disassembly of the positioning frame 2. After the oil extraction work is completed, crude oil will be attached to the inner wall of the positioning frame 2. By pulling the positioning frame 2 down, the guide block 22 at the top of the positioning frame 2 is disengaged from the auxiliary strip 24, the auxiliary strip 24 is released from the locking of the positioning frame 2, and then the positioning frame 2 is replaced. By achieving multi-stage automatic cleaning and convenient maintenance after oil extraction, when the positioning frame 2 is reset, the cone plate 18 closes and seals the main pipeline under the action of the positioning spring 110. At the same time, the cone plate 18 pre-scrapes the crude oil on the outer wall of the positioning frame 2 to reduce adhesion residue. Then, the motor 3 drives the gear and rack ring 33 to drive the shuttle block 111 to rotate, which can scrape off the crude oil and gum attached to the bottom surface of the cone plate 18, preventing the two cone plates 18 from sticking together and making it difficult to open later. In addition, the positioning frame 2 is assembled by snapping together with the guide block 22 and the auxiliary strip 24. There is no need to close the main valve or drain the residual oil in the pipeline. The snapping can be quickly released and the replacement can be done simply by pulling it down. This greatly simplifies the disassembly and assembly process. The overall structure realizes the integration of scraping, rotation cleaning and quick replacement, effectively avoiding residual oil leakage and pipeline blockage, reducing downtime and labor costs, improving the service life of the throttle valve and the continuity of oil production operations, and significantly improving safety and work efficiency.
[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A wellhead tree throttling valve, comprising a valve body (1), a rotating shaft (11) rotatably disposed above the valve body (1), a base plate (13) fixedly connected to the bottom end of the rotating shaft (11), a valve cavity (12) formed inside the valve body (1), a guide frame (14) fixedly connected inside the valve cavity (12), and a positioning plate (16) fixedly connected to the top of the guide frame (14), characterized in that: The positioning plate (16) has a fixing groove (17) on its surface. The lower surface of the positioning plate (16) is provided with a sealing element for sealing the fixing groove (17). The lower surface of the base plate (13) has several guide grooves (21). The lower surface of the base plate (13) is fixed with several positioning frames (2), which increase in a stepped manner. The upper surface of the positioning frame (2) is provided with a disassembly component, which is used to disassemble and replace the positioning frame (2). The sealing element includes a plurality of positioning grooves (19) formed on the lower surface of the positioning plate (16). Each positioning groove (19) is fixedly connected to a positioning spring (110). One end of the positioning spring (110) is fixedly connected to a cone plate (18). The cross section of the cone plate (18) is a right trapezoid. Two cone plates (18) are combined to form a sealing element to seal the fixing groove (17). The tips of the two cone plates (18) abut in an arc shape, and the tips of the two cone plates (18) can scrape the positioning frame (2); A sealing block (112) is fixed to one side of one of the cone plates (18), and a sealing frame (113) is fixed to one side of the other cone plate (18). The sealing block (112) can be inserted into the sealing frame (113), and the sealing block (112) and the sealing frame (113) simultaneously seal the positioning groove (19). An auxiliary block (114) is fixed to both sides of the cone plates (18) of the positioning plate (16), and the auxiliary block (114) seals its corresponding positioning groove (19).
2. A choke valve for a Christmas tree for a wellhead according to claim 1, characterized in that: The guide frame (14) is rotatably equipped with a rack ring (33). A fixing plate (15) is fixedly connected to one side of the guide frame (14). A motor (3) is fixedly connected to the top of the fixing plate (15). A first gear (31) is fixedly connected to the output end of the motor (3). The first gear (31) meshes with a second gear (32). The second gear (32) meshes with the rack ring (33). Two spindle blocks (111) are fixedly connected to the inner wall of the rack ring (33). The two spindle blocks (111) are staggered and mirror symmetrical. The two spindle blocks (111) can process the bottom surface of the cone plate (18).
3. The wellhead tree throttle valve according to claim 1, characterized in that: The disassembly assembly includes several limiting grooves (26) on the lower surface of the base plate (13). Several auxiliary springs (25) are fixed inside each limiting groove (26). One end of each auxiliary spring (25) is fixed to the same auxiliary strip (24). Two sets of guide blocks (22) are fixed to the top of the positioning frame (2). An auxiliary groove (23) is opened on one side of each guide block (22). The auxiliary strip (24) can be inserted into the auxiliary groove (23).
4. A wellhead tree throttle valve according to claim 3, characterized in that: The end of the auxiliary strip (24) is convex, and the auxiliary groove (23) can engage the auxiliary strip (24). The end of the auxiliary strip (24) is made of magnetic material and can magnetically attract the guide block (22).
5. A wellhead tree throttle valve according to claim 1, characterized in that: When using the throttle valve, the bottom plate (13) is first driven to move down by rotating the rotating shaft (11). The downward movement of the bottom plate (13) drives the positioning frames (2) on its lower surface to be inserted into the fixed grooves (17) one by one. Then the cone plate (18) is squeezed to move to both sides, thereby opening the channel and allowing crude oil to flow. When a large flow rate is required, the rotating shaft (11) is driven to rotate to open the flow between multiple positioning frames (2) and the fixed grooves (17), thereby achieving the throttling effect. During the oil extraction process, the tips of the two cone plates (18) are in contact with the outer wall of the positioning frame (2). When the oil extraction work is completed, the rotating shaft is driven to move the positioning frame (2) back. During the back-moving process, the tips of the cone plates (18) scrape the outer wall of the positioning frame (2).
6. The wellhead tree throttle valve according to claim 1, characterized in that: During the process of the cone plate (18) being squeezed open, one of the cone plates (18) will simultaneously drive the sealing block (112) on its side, and the other cone plate (18) will drive the sealing frame (113) on its side. The sealing block (112) and the sealing frame (113) are initially in the insertion state. The movement of the cone plate (18) causes the sealing block (112) and the sealing frame (113) to slide and insert, simultaneously maintaining the sealing work of the positioning groove (19).
7. A wellhead tree throttle valve according to claim 4, characterized in that: After the oil extraction work is completed, the rotating shaft (11) drives the bottom plate (13) to retract, which drives the positioning frame (2) to reset. At this time, the cone plate (18) is released from compression, and the two cone plates (18) are reset under the reset force of the positioning spring (110), so that the positioning plate (16) seals the main pipeline. Then, the motor (3) at the top of the fixed plate (15) is started again. The motor (3) drives the first gear (31) to rotate, the first gear (31) drives the second gear (32) to rotate, and the second gear (32) drives the rack ring (33) to rotate. The rotation of the rack ring (33) drives the spindle block (111) fixed to its inner wall to rotate. The crude oil on the bottom surface of the cone plate (18) is cleaned. When the positioning frame (2) is retracted, the cone plate (18) will scrape the crude oil on the side of the positioning frame (2). Therefore, the shuttle block (111) completes the processing of the cone plate (18) and can remove the rotating shaft (11). The removal of the rotating shaft (11) is the disassembly of the positioning frame (2). After the oil extraction work is completed, the inner wall of the positioning frame (2) will be covered with crude oil. By pulling down the positioning frame (2), the guide block (22) at the top of the positioning frame (2) is disengaged from the auxiliary strip (24), the auxiliary strip (24) is released from the locking of the positioning frame (2), and then the positioning frame (2) is replaced.