Ultrahigh pressure natural gas intelligent mining complete equipment

Abstract

The invention relates to the technical field of natural gas extraction, in particular to ultrahigh pressure natural gas intelligent extraction complete equipment which comprises a casing head body, an oil pipe head body, a four-way body and a plurality of valves, a flow meter is arranged on a pipeline, a second shut-off valve and a sixth shut-off valve are hydraulic flat safety valves, and a first throttling valve and a second throttling valve are consistent in structure. A displacement sensor is arranged, and a plurality of rows of through holes are evenly distributed in the first valve seat along the circumferential face of the first valve seat, and through linkage control of the multiple rows of staggered through holes with simple and convenient hole diameters of the safety throttle valve, the pressure transmitter, the flowmeter, the displacement sensor and the oil cylinder, real-time, rapid and accurate adjustment of the natural gas flow is achieved; the problem that in the prior art, the response of a throttle valve lags behind frequent pressure fluctuation is fundamentally solved, the yield loss and the safety risk caused by the response are effectively avoided, and the stability and the safety of the mining process are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas extraction, and in particular to a complete set of ultra-high pressure natural gas intelligent extraction equipment. Background Art

[0002] Ultra-high-pressure gas production wellheads are a key piece of equipment used in the oil and gas industry, particularly in the extraction of deep and ultra-deep oil and gas resources. They primarily consist of a Christmas tree and tubing. The Christmas tree is the core component, with a flange at its base that connects to other components via bolt holes.

[0003] In the prior art, a combination valve is provided on the gas production tree, including a safety valve. When the pressure fluctuates violently, the safety valve needs to be closed to prevent the occurrence of well control accidents. In daily use, the gas flow rate will change under normal pressure fluctuations. At this time, the throttle valve needs to be adjusted to control the production. However, when the fluctuation is more frequent, the opening of the throttle valve often cannot keep up with the changes in pressure fluctuations, resulting in reduced production or excessive flow, posing a safety hazard. Summary of the Invention

[0004] The problem solved by the present invention is that the opening of the throttle valve often cannot keep up with the changes in pressure fluctuations, resulting in reduced production or excessive flow, which poses a safety hazard. The present invention provides an ultra-high-pressure natural gas intelligent production equipment set that can accurately control the throttle valve opening, increase production, and reduce safety hazards.

[0005] The present invention is achieved through the following technical solutions: a complete set of ultra-high pressure natural gas intelligent extraction equipment, including a casing head body, a tubing head body, a first shut-off valve, a second shut-off valve, and a four-way body;

[0006] The spool, second shut-off valve, first shut-off valve, tubing head body, and casing head body are arranged in sequence from top to bottom, and are all connected by flange sealing. Both ends of the spool are connected to gas outlets, and both ends of the tubing head body are connected to nitrogen injection ports. The spool serves as a fluid distribution hub, connecting the main channel and the outlet channels on both sides. The flange connection provides high-pressure sealing, and the nitrogen injection port is used to inject nitrogen (such as for well control, pigging, or testing).

[0007] A third shut-off valve is connected to the upper end of the four-way body, and a pressure transmitter is connected to the third shut-off valve; the third shut-off valve is used to isolate or connect the pressure monitoring point, and the pressure transmitter monitors the pressure in the four-way body (i.e., the main production channel) in real time.

[0008] The left and right ends of the four-way body are divided into two gas production routes, both of which can be opened, or one can be used and the other reserved. The left end is connected to the fourth shut-off valve, the fifth shut-off valve, and the first throttle valve in sequence from the flange. It is the valve configuration of the left production branch. Natural gas flows out of the four-way body and flows through the fourth shut-off valve, the fifth shut-off valve, and the first throttle valve in sequence. The shut-off valve is used to fully open or cut off the branch, and the first throttle valve is used to fine-tune the flow and pressure of the branch.

[0009] The right end of the spool is connected outward from the flange to the sixth, seventh, and second throttle valves, sequentially. These valves serve the right production branch, and their structure is symmetrical to the left: fluid flows through the sixth, seventh, and second throttle valves in sequence. Their functions are the same as those of the left branch: the shutoff valves fully open or shut off the branch, while the second throttle valve finely adjusts the flow and pressure within the branch.

[0010] The second and sixth shutoff valves are hydraulically operated flat-plate safety valves, which are interlocked with pressure transmitters and receive signals from them. When the monitored pressure exceeds a safety threshold (severe fluctuations or excessive pressure), the interlocking control automatically drives these hydraulically operated flat-plate safety valves to close rapidly.

[0011] The first and second throttle valves have the same structure and are both safety throttle valves. They include a first valve body, a first valve seat, a first valve stem, a first valve cover, a first cylinder, and a displacement sensor. The first valve seat is cylindrical, with its upper and lower ports sealed to the first valve body. Multiple rows of through-holes are arranged along its circumference, connecting the outer and inner cylindrical surfaces of the first valve seat. The first valve stem is sleeved within the first valve seat and can slide up and down. As it slides up and down, it gradually moves away from or blocks the multiple rows of through-holes. The upper end of the first valve stem passes through the first valve cover and is connected to the first cylinder. The first cylinder is equipped with a displacement sensor, which is connected to the piston of the first cylinder. The first valve stem is driven by the first cylinder to move axially up and down. When the first valve stem rises, the area blocking the through-holes in the first valve seat decreases, increasing the flow area and increasing the flow rate (increasing the opening). When the first valve stem descends, the area blocking the through-holes increases, decreasing the flow area and decreasing the flow rate (decreasing the opening). The displacement sensor monitors the precise position of the first valve stem (i.e., the throttle valve opening) in real time for fine-tuning the flow rate.

[0012] Flowmeters are connected to the outlet pipes of the first and second throttle valves. The first hydraulic cylinder, displacement sensor, and flowmeter are controlled in a linked manner. Flowmeters are installed at the outlets of the first and second throttle valves to measure the actual output flow in real time. The control system compares the actual flow rate measured by the flowmeters with the target flow rate. Combined with the current valve opening feedback from the displacement sensor, an algorithm (such as PID) is used to calculate a control signal, which actuates the first hydraulic cylinder and adjusts the position of the first valve stem to achieve valve opening adjustment, ultimately ensuring that the actual flow rate accurately and quickly tracks the target flow rate. This forms a closed-loop control loop: "target setting -> actuator actuation -> flow rate / opening measurement -> feedback comparison -> actuator adjustment." By leveraging real-time flow feedback and fast hydraulic actuators, the system can automatically, quickly, and accurately adjust the throttle valve opening to accommodate pressure fluctuations.

[0013] Furthermore, the first oil cylinder is connected to a manual pump. When the first oil cylinder is equipped with a manual pump, in emergency situations such as failure of the automatic control system or power source failure, the operator can operate the manual pump to provide hydraulic oil to the oil cylinder and manually drive the first valve stem to move, thereby adjusting or closing the throttle valve opening.

[0014] Furthermore, the multiple rows of through holes increase in diameter from bottom to top. The multiple rows of through holes on the valve seat are not of uniform diameter. Instead, they are arranged along the direction of movement of the first valve stem, with holes located lower down having smaller diameters and holes located higher up having larger diameters. At small openings, the small holes provide more precise flow control and higher adjustment sensitivity. At wide openings, the large holes provide greater flow capacity, preventing excessive pressure drop. This helps achieve a more linear flow control curve across the entire opening range, better suited to process requirements.

[0015] Furthermore, the directions of two adjacent rows of through holes in the plurality of rows of through holes are staggered. This staggered arrangement disrupts the symmetry of the through hole distribution, helps disperse the fluid, makes the fluid flowing through the first valve seat more evenly distributed, reduces eddy currents and valve vibration that may be caused by symmetrical jets, and improves the stability and life of the valve.

[0016] Furthermore, the first cylinder is a single-acting cylinder, equipped with a first return spring. When hydraulic oil is injected into the cylinder, the pressure overcomes the spring force, pushing the piston to move. When the valve needs to be opened, the hydraulic oil is released, and the elastic force of the first return spring inside the cylinder pushes the piston in the opposite direction, opening the throttle valve.

[0017] Furthermore, the hydraulic flat safety valve includes a second valve body, a second valve cover, a second valve seat, a second valve plate, a second valve stem, a second oil cylinder, a sensing ring, and an indicator frame. The indicator frame is equipped with a first position sensor and a second position sensor. The Zhishijia is mounted on the second oil cylinder. The second oil cylinder is a double-ended oil cylinder. The lower end of the second oil cylinder's piston shaft is connected to the second valve stem. The upper end of the second oil cylinder's piston shaft is connected to the sensing ring, which extends into the indicator frame. When the second oil cylinder is at its upper and lower extreme travel limits, the sensing ring is located at the first and second position sensors, respectively. The second valve plate moves on the second valve seat to open and close the valve. This movement is driven by the second oil cylinder via the second valve stem. The sensing ring is fixed to the upper end of the piston shaft and moves with the piston. The indicator frame is equipped with two position sensors (the first position sensor corresponds to the fully open position, and the second position sensor corresponds to the fully closed position). When the piston reaches its extreme position (fully open or fully closed), the sensing ring moves to the sensing area of the corresponding position sensor. The induction ring cooperates with the first position sensor and the second position sensor to detect in real time and contactlessly whether the hydraulic flat safety valve is fully open or fully closed (in-position state), and feeds this status signal back to the control system to confirm that the valve has executed the in-position command, which is crucial for safety interlocking.

[0018] Furthermore, the indicator frame is also equipped with a handwheel, a handwheel rod, a bearing box, and a thrust bearing. The handwheel rod and the indicator frame are connected by threads, and the lower end of the handwheel rod is rotatably connected to the bearing box via a thrust bearing. The lower surface of the bearing box is flat and can be abutted against the induction ring. In the event of a hydraulic system failure, the operator can rotate the handwheel. The handwheel rod engages with the indicator frame via threads. Rotating the handwheel causes the handwheel rod to move axially. The thrust bearing ensures that when the handwheel rotates, the bearing box does not rotate with it and only moves axially. The flat surface at the bottom of the bearing box eventually presses against the induction ring, thereby manually pushing the piston shaft to open or close the valve. In the event of a complete failure of the hydraulic system (such as a power source failure or oil line rupture), a reliable manual operation method is provided to ensure that the valve can still be operated, thereby improving safety redundancy.

[0019] Furthermore, the first position sensor and the second position sensor are both proximity switches, which have no mechanical friction, high reliability, long service life, and are suitable for frequent operations.

[0020] Furthermore, the second hydraulic cylinder is a single-acting cylinder equipped with a second return spring. If the hydraulic power / control system fails, the return spring automatically pushes the safety valve toward the opening direction. This ensures that the safety valve will not accidentally close and block the wellhead in the event of a system failure. The emergency shutdown function relies on actively applied hydraulic pressure, preventing accidental closure of the wellhead due to control failure and mitigating potential risks.

[0021] Furthermore, a locking screw is threadedly connected to the indicator frame, and the locking screw can abut against the second valve stem, and use friction to lock the second valve stem in this position to prevent it from moving accidentally, thereby improving safety.

[0022] The beneficial effects of the present invention are:

[0023] 1. The invention realizes real-time, rapid and precise regulation of natural gas flow through the safety throttle valve's multiple rows of staggered holes with simple apertures and interlocking control with the pressure transmitter, flow meter, displacement sensor and oil cylinder. This fundamentally solves the problem in the prior art that the throttle valve response lags behind frequent pressure fluctuations, effectively avoids the resulting production losses and safety risks, and significantly improves the stability and safety of the mining process.

[0024] 2. The present invention constructs multiple active and passive safety assurance systems. The equipment integrates multiple safety mechanisms. The hydraulic flat-plate safety valve and the pressure transmitter are interlocked to achieve rapid automatic emergency shutdown in case of overpressure; the safety throttle valve and the hydraulic flat-plate safety valve adopt a single-acting oil cylinder + reset spring design to ensure that they automatically enter a fail-open safety state when power / control fails to prevent accidental blockage. The production branch adopts a double-off valve design to ensure maintenance safety; the hydraulic flat-plate safety valve is equipped with a position sensor to achieve precise position feedback, and all hydraulic valves are equipped with a manual override function to improve production safety.

[0025] 3. The through-hole aperture gradient and staggered arrangement design of the safety throttle valve of the present invention optimize the flow regulation characteristics (more linear and precise) and reduce erosion wear, thereby extending the service life.

[0026] 4. The present invention adopts modular flange connection, which is easy to manufacture, install and maintain. The symmetrical dual outlet / dual production branch design provides operational flexibility and system redundancy reliability. The structural optimization enhances the long-term operation reliability and maintenance convenience in ultra-high pressure and high erosion environment, bringing significant full life cycle benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a complete set of ultra-high pressure natural gas intelligent extraction equipment according to the present invention;

[0028] Figure 2 This is a P&ID flow chart of a complete set of ultra-high pressure natural gas intelligent extraction equipment according to the present invention;

[0029] Figure 3 This is a schematic structural diagram of the safety throttle valve of the present invention;

[0030] Figure 4 for Figure 3 A partial enlarged view of

[0031] Figure 5 This is a schematic diagram of the expansion of the first valve seat of the safety throttle valve.

[0032] Figure 6 This is a schematic diagram of the closed state of the hydraulic flat safety valve according to the present invention;

[0033] Figure 7 This is a schematic diagram of the hydraulic flat safety valve of the present invention in an open state;

[0034] Figure 8 for Figure 6 A partial enlarged view of .

[0035] In the figure: 1 casing head body; 2 tubing head body; 3 first shut-off valve; 4 second shut-off valve; 5 quadrilateral; 6 third shut-off valve; 7 pressure transmitter; 8 fourth shut-off valve; 9 fifth shut-off valve; 10 first throttle valve; 11 sixth shut-off valve; 12 seventh shut-off valve; 13 second throttle valve; 14 flow meter;

[0036] 100 safety throttle valve; 101 first valve body; 102 first valve seat; 103 first valve stem; 104 first valve cover; 105 first oil cylinder; 106 displacement sensor; 107 through hole; 108 manual pump;

[0037] 200 hydraulic flat safety valve; 201 second valve body; 202 second valve cover; 203 second valve seat; 204 second valve plate; 205 second valve stem; 206 second oil cylinder; 207 induction ring; 208 indicator rack; 209 first position sensor; 210 second position sensor; 211 handwheel; 212 handwheel rod; 213 bearing box; 214 thrust bearing; 215 locking screw. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] like Figure 1-8 As shown, a set of ultra-high pressure natural gas intelligent extraction equipment includes a casing head body 1, a tubing head body 2, a first shut-off valve 3, a second shut-off valve 4, and a spool 5;

[0040] The spool 5, second shut-off valve 4, first shut-off valve 3, tubing head body 2, and casing head body 1 are arranged in sequence from top to bottom, and are all sealed and connected by flanges. Both ends of the spool 5 are connected to gas outlets, and both ends of the tubing head body 2 are connected to nitrogen injection ports. The spool 5 serves as a fluid distribution hub, connecting the main channel and the outlet channels on both sides. The flange connection provides a high-pressure seal, and the nitrogen injection port is used to inject nitrogen (such as for well control, pigging, or testing).

[0041] The upper end of the four-way body 5 is connected to a third shut-off valve 6, and the third shut-off valve 6 is connected to a pressure transmitter 7; the third shut-off valve 6 is used to isolate or connect the pressure monitoring point, and the pressure transmitter 7 monitors the pressure in the four-way body 5 (i.e., the main production channel) in real time.

[0042] The left and right ends of the four-way body 5 are divided into two gas production routes, both of which can be opened, or one can be used and the other reserved. The left end is connected to the fourth shut-off valve 8, the fifth shut-off valve 9, and the first throttle valve 10 in sequence from the flange. It is the valve configuration of the left production branch. Natural gas flows out of the four-way body 5 and flows through the fourth shut-off valve 8, the fifth shut-off valve 9, and the first throttle valve 10 in sequence. The shut-off valve is used to fully open or cut off the branch, and the first throttle valve 10 is used to fine-tune the flow and pressure of the branch.

[0043] The right end of the spool 5 is connected outward from the flange to a sixth shutoff valve 11, a seventh shutoff valve 12, and a second throttle valve 13. This is the valve configuration for the right production branch, and its structure is symmetrical to that of the left: fluid flows through the sixth shutoff valve 11, the seventh shutoff valve 12, and the second throttle valve 13 in sequence. Their functions are the same as those of the left branch: the shutoff valves fully open or shut off the branch, and the second throttle valve 13 finely adjusts the flow and pressure of the branch.

[0044] The second shutoff valve 4 and the sixth shutoff valve 11 are hydraulically operated flat-plate safety valves 200. These hydraulically operated flat-plate safety valves 200 are interlocked with the pressure transmitter 7 and receive signals from the pressure transmitter 7. When the monitored pressure exceeds a safety threshold (severe fluctuations or excessive pressure), the interlocking control automatically drives these hydraulically operated flat-plate safety valves 200 to close rapidly.

[0045] The first throttle valve 10 and the second throttle valve 13 have the same structure and are both safety throttle valves 100. The safety throttle valve 100 includes a first valve body 101, a first valve seat 102, a first valve stem 103, a first valve cover 104, a first oil cylinder 105, and a displacement sensor 106. The first valve seat 102 is cylindrical, and the upper and lower ports of the first valve seat 102 are sealed and connected to the first valve body 101. The first valve seat 102 is evenly distributed along its circumferential surface with multiple rows of through holes 107, and the through holes 107 are connected to the outer cylindrical portion of the first valve seat 102. The first valve stem 103 is sleeved within the first valve seat 102 and is able to slide up and down. As it slides, it gradually moves away from or blocks the multiple rows of through-holes 107. The upper end of the first valve stem 103 passes through the first valve cover 104 and is connected to the first cylinder 105. A displacement sensor 106 is mounted on the first cylinder 105 and connected to the piston of the first cylinder 105. Driven by the first cylinder 105, the first valve stem 103 moves axially up and down. When the first valve stem 103 rises, the area blocking the through-holes 107 in the first valve seat 102 decreases, increasing the flow area and increasing the flow rate (increasing the opening). When the first valve stem 103 descends, the area blocking the through-holes 107 increases, decreasing the flow area and decreasing the flow rate (decreasing the opening). The displacement sensor 106 monitors the precise position of the first valve stem 103 (i.e., the throttle valve opening) in real time, enabling fine-tuning of the flow rate.

[0046] In actual application, the outlet pipelines of the first and second throttle valves 10 and 13 are connected to flowmeters 14. The first hydraulic cylinder 105, displacement sensor 106, and flowmeter 14 are controlled in a linked manner. Flowmeters 14 are installed at the outlets of the first and second throttle valves 10 and 13 to measure the actual output flow in real time. The control system compares the actual flow rate measured by the flowmeters 14 with the target flow rate. Combined with the current valve opening feedback from the displacement sensor 106, an algorithm (such as PID) is used to calculate a control signal, which actuates the first hydraulic cylinder 105 and adjusts the position of the first valve stem 103 to achieve valve opening adjustment, ultimately ensuring that the actual flow rate accurately and quickly tracks the target flow rate. This forms a closed-loop control circuit: "target setting -> actuator actuation -> flow rate / opening measurement -> feedback comparison -> actuator adjustment." Through real-time flow feedback and fast hydraulic actuators, the system can automatically, quickly, and accurately adjust the throttle valve opening to adapt to pressure fluctuations.

[0047] In actual application, the first oil cylinder 105 is connected to a manual pump 108. The first oil cylinder 105 is equipped with a manual pump 108. In emergency situations such as failure of the automatic control system or power source failure, the operator can operate the manual pump 108 to provide hydraulic oil to the oil cylinder, manually drive the first valve stem 103 to move, and adjust or close the throttle valve opening.

[0048] In practice, the multiple rows of through holes 107 increase in diameter from bottom to top. The multiple rows of through holes 107 on the valve seat are not of uniform diameter. Instead, they are arranged along the direction of movement of the first valve stem 103, with holes located lower down having smaller diameters and holes located higher up having larger diameters. At small openings, the small holes provide more precise flow control and higher adjustment sensitivity. At wide openings, the large holes provide greater flow capacity, avoiding excessive pressure drop. This helps achieve a more linear flow control curve that better meets process requirements across the entire opening range.

[0049] In actual applications, the directions of two adjacent rows of through holes 107 in the plurality of rows of through holes 107 are staggered. The staggered arrangement destroys the symmetry of the distribution of the through holes 107, helps disperse the fluid, makes the fluid flowing through the first valve seat 102 more evenly distributed, reduces eddy currents and valve vibration that may be caused by symmetrical jets, and improves the stability and life of the valve.

[0050] In practice, first cylinder 105 is a single-acting cylinder equipped with a first return spring. When hydraulic oil is injected into the cylinder, the pressure overcomes the spring force, pushing the piston to move. To open the valve, the hydraulic oil is released, and the force of the first return spring within the cylinder pushes the piston in the opposite direction, opening the throttle valve.

[0051] In practice, the hydraulic flat safety valve 200 comprises a second valve body 201, a second valve cover 202, a second valve seat 203, a second valve plate 204, a second valve stem 205, a second oil cylinder 206, a sensing ring 207, and an indicator frame 208. The indicator frame 208 is equipped with a first position sensor 209 and a second position sensor 210. The Zhishijia is mounted on the second oil cylinder 206. The second oil cylinder 206 is a double-ended oil cylinder. The lower end of the piston shaft of the second oil cylinder 206 is connected to the second valve stem 205. The upper end of the piston shaft of the second oil cylinder 206 is connected to the sensing ring 207 and extends into the indicator frame 208. When the second oil cylinder 206 is at its upper and lower limit travel, the sensing ring 207 is located at the first position sensor 209 and the second position sensor 210, respectively. The second valve plate 204 moves on the second valve seat 203 to open and close the valve. This movement is driven by the second oil cylinder 206 via the second valve stem 205. Sensing ring 207 is fixed to the upper end of the piston shaft and moves with the piston. Two position sensors are mounted on indicator bracket 208 (first position sensor 209 corresponds to the fully open position, and second position sensor 210 corresponds to the fully closed position). When the piston reaches its extreme position (fully open or fully closed), sensing ring 207 moves to the sensing area of the corresponding position sensor. Sensing ring 207, in conjunction with first and second position sensors 209 and 210, provides real-time, contactless detection of whether the hydraulic flat safety valve 200 is fully open or fully closed (in-position state). This status signal is fed back to the control system, confirming that the valve has executed the in-position command, which is crucial for safety interlocks.

[0052] In practice, the indicator frame 208 is also provided with a handwheel 211, a handwheel rod 212, a bearing box 213, and a thrust bearing 214. The handwheel rod 212 and the indicator frame 208 are connected by threads. The lower end of the handwheel rod 212 is rotatably connected to the bearing box 213 via the thrust bearing 214. The lower surface of the bearing box 213 is flat and can be abutted against the induction ring 207. In the event of a hydraulic system failure, the operator can rotate the handwheel 211. The handwheel rod 212 engages with the indicator frame 208 via threads. Rotating the handwheel 211 causes the handwheel rod 212 to move axially. The thrust bearing 214 ensures that when the handwheel 211 rotates, the bearing box 213 does not rotate with it and only moves axially. The flat bottom surface of the bearing box 213 eventually presses against the induction ring 207, thereby manually pushing the piston shaft to open or close the valve. When the hydraulic system fails completely (such as power source failure, oil circuit rupture), a reliable manual operation method is provided to ensure that the valve can still be operated, thereby improving safety redundancy.

[0053] In practical applications, both the first position sensor 209 and the second position sensor 210 are proximity switches, which have no mechanical friction, high reliability, long life, and are suitable for frequent operations.

[0054] In practice, the second hydraulic cylinder 206 is a single-acting cylinder equipped with a second return spring. If the hydraulic power / control system fails, the return spring automatically pushes the safety valve toward the open position. This ensures that the safety valve will not accidentally close and block the wellhead in the event of a system failure. The emergency shutdown function relies on actively applied hydraulic pressure to prevent accidental closure of the wellhead due to control failure, thus mitigating potential risks.

[0055] In actual application, the indicator frame 208 is threadedly connected with a locking screw 215, and the locking screw 215 can abut against the second valve stem 205, and use friction to lock the second valve stem 205 in this position to prevent it from accidental movement, thereby improving safety.

[0056] In summary, the present invention realizes real-time, rapid and precise regulation of natural gas flow through pressure transmitters, flow meters, displacement sensors and oil cylinder interlocking control, fundamentally solving the problem in the prior art that the throttle valve response lags behind frequent pressure fluctuations, effectively avoiding the resulting production losses and safety risks, and significantly improving the stability and safety of the mining process.

[0057] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments are only for the purpose of illustrating the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A complete set of ultra-high pressure natural gas intelligent extraction equipment, characterized by: It comprises a casing head body (1), a tubing head body (2), a first shut-off valve (3), a second shut-off valve (4), and a four-way body (5); The upper end of the four-way body (5) is connected to a third shut-off valve (6), and the third shut-off valve (6) is connected to a pressure transmitter (7); The left end of the four-way body (5) is connected outwardly from the flange in sequence to the fourth shut-off valve (8), the fifth shut-off valve (9), and the first throttle valve (10); The right end of the four-way body (5) is connected to the first throttle valve (11), the seventh shut-off valve (12), and the second throttle valve (13) in sequence outward from the flange; The second shut-off valve (4) and the first throttle valve (11) are hydraulic flat safety valves (200), and the hydraulic flat safety valve (200) and the pressure transmitter (7) are interlocked and controlled; The first throttle valve (10) and the second throttle valve (13) are both safety throttle valves (100), and the safety throttle valve (100) comprises a first valve body (101), a first valve seat (102), a first valve stem (103), a first valve cover (104), a first oil cylinder (105), and a displacement sensor (106). The first valve seat (102) is cylindrical, and the upper and lower ports of the first valve seat (102) are sealedly connected to the first valve body (101). The first valve seat (102) is uniformly provided with a plurality of rows of through holes (107) along its circumferential surface. The through holes (107) ) is connected to the outer cylindrical surface and the inner cylindrical surface of the first valve seat (102); the first valve stem (103) is sleeved in the first valve seat (102) and can slide up and down. When the first valve stem (103) slides up and down, it can gradually move away from the multiple rows of through holes (107) or gradually block the multiple rows of through holes (107); the upper end of the first valve stem (103) passes through the first valve cover (104) and is connected to the first oil cylinder (105); a displacement sensor (106) is installed on the first oil cylinder (105); the displacement sensor (106) is connected to the piston of the first oil cylinder (105); The outlet pipelines of the first throttle valve (10) and the second throttle valve (13) are connected to a flow meter (14), and the first oil cylinder (105), the displacement sensor (106), and the flow meter (14) are interlocked and controlled.

2. The ultra-high pressure natural gas intelligent extraction equipment according to claim 1, characterized in that: The first oil cylinder (105) is connected to a manual pump (108).

3. The ultra-high pressure natural gas intelligent extraction equipment according to claim 1, characterized in that: The diameters of the multiple rows of through holes (107) gradually increase from bottom to top.

4. The ultra-high pressure natural gas intelligent extraction equipment according to claim 3 is characterized by: Two adjacent rows of through holes (107) in the plurality of rows of through holes (107) are staggered in direction.

5. The ultra-high pressure natural gas intelligent extraction equipment according to claim 1 is characterized in that: The first oil cylinder (105) is a single-acting oil cylinder, and a first return spring is provided in the first oil cylinder (105).

6. The ultra-high pressure natural gas intelligent extraction complete set of equipment according to claim 1, characterized in that: The hydraulic flat safety valve (200) includes a second valve body (201), a second valve cover (202), a second valve seat (203), a second valve plate (204), a second valve stem (205), a second oil cylinder (206), an induction ring (207), and an indicator frame (208). The indicator frame (208) is provided with a first position sensor (209) and a second position sensor (210). The Zhishijia is installed on the second oil cylinder (206). The second oil cylinder (206) is a double-headed oil cylinder. The lower end of the piston shaft of the second oil cylinder (206) is connected to the second valve stem (205). The upper end of the piston shaft of the second oil cylinder (206) is connected to the induction ring (207) and extends into the indicator frame (208). When the second oil cylinder (206) is located at the upper and lower limit strokes, the induction ring (207) is located at the first position sensor (209) and the second position sensor (210), respectively.

7. The ultra-high pressure natural gas intelligent extraction equipment according to claim 6, characterized in that: The indicator frame (208) is further provided with a handwheel (211), a handwheel rod (212), a bearing box (213), and a thrust bearing (214). The handwheel rod (212) and the indicator frame (208) are connected via threads. The lower end of the handwheel rod (212) is rotatably connected to the bearing box (213) via the thrust bearing (214). The lower surface of the bearing box (213) is flat and can be offset against the induction ring (207).

8. The ultra-high pressure natural gas intelligent extraction equipment according to claim 6, characterized in that: The first position sensor (209) and the second position sensor (210) are both proximity switches.

9. The ultra-high pressure natural gas intelligent extraction equipment according to claim 6, characterized in that: The second oil cylinder (206) is a single-acting oil cylinder, and a second return spring is provided in the second oil cylinder (206).

10. The ultra-high pressure natural gas intelligent extraction complete set of equipment according to claim 6, characterized in that: A locking screw (215) is threadedly connected to the indicator frame (208), and the locking screw (215) is capable of abutting against the second valve stem (205).

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