Wax removal and blockage removal device and method for petroleum and natural gas throttle valve

Abstract

The invention provides a paraffin removal and plug removal device and method for a petroleum and natural gas throttling valve, the paraffin removal and plug removal device comprises a throttling valve body, a high-temperature heating device is arranged at an inlet of the valve body and used for heating and removing solid paraffin in a throttling device at an outlet of the valve body, and a hydrogen storage device is arranged at the tail of the valve body; an outlet of the hydrogen storage device is arranged right opposite to the throttling device at the outlet of the valve body and used for melting solid paraffin in the throttling device through hydrogen throttling and heating. According to the invention, the hydrogen storage device and the high-temperature heating device are redesigned in the throttle valve, so that the paraffin in the wellhead throttle valve can be removed and the blockage of the throttle device blocked by the paraffin can be removed under the conditions that the internal pressure is not damaged and the production operation is not stopped; meanwhile, hydrogenation work is realized under the condition of not shutting in a well and stopping production operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas wellhead equipment, and particularly relates to a wax removal and plugging removal device and method for an oil and gas throttle valve. Background Art

[0002] As an indispensable key equipment at the oil and gas wellhead, the throttle valve plays a crucial role in throttling and reducing the pressure of oil and gas, by reducing the pressure of the wellhead natural gas to a value that can be tolerated by downstream equipment or pipelines. A large amount of solid paraffin discharged from the bottom of the well will cause serious blockage to the throttling components of the throttle valve. In the mild case, it reduces the working efficiency of the throttle valve and is not conducive to the normal and orderly production of natural gas. In the severe case, it directly blocks the throttling components of the throttle valve, bringing serious safety hazards to on-site workers.

[0003] The existing methods for wax removal of throttle valves at well sites are divided into two types. One is to wrap heat preservation tapes at the throttle valve inlet pipeline and the throttle valve body, and increase the temperature inside the throttle valve through the heat preservation tapes, so that the solid paraffin melts into a liquid state to achieve the purpose of wax removal. The problem with this method is that it has a certain effect on well sites with a small amount of paraffin discharge. Once the paraffin discharge is large and dense, relying solely on heating and melting paraffin with heat preservation tapes seems insignificant. The other wax removal method is to stop the production operation of oil and gas. After shutting down the well, the throttle valve is disassembled, the paraffin accumulated in the throttle valve cavity is manually removed, and then the paraffin blocked in the throttling components is mainly removed. This wax removal method can handle the situation of a large amount of paraffin discharge. The problem it has is that it has to shut down the well for operation, seriously affecting the normal production order, reducing the natural gas production efficiency. At the same time, it not only brings great work intensity to on-site workers, but also has certain safety hazards. Therefore, it is necessary to find a new solution that can overcome the above problems, achieve the effect of wax removal and plugging removal without affecting the construction effect, and ensure the working efficiency. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a wax removal and plugging removal device and method for an oil and gas throttle valve. By redesigning the hydrogen storage device and high-temperature heating device inside the throttle valve, it can achieve the removal of paraffin in the wellhead throttle valve and the plugging removal of the throttling device blocked by paraffin without destroying the internal pressure and stopping the production operation, and at the same time achieve the hydrogen addition work without shutting down the well and stopping the production operation.

[0005] To achieve the above object, the present invention provides the following technical solution: A paraffin removal and plugging removal device for an oil and gas throttle valve, comprising a throttle valve body. A high-temperature heating device is provided at the inlet of the valve body for heating and removing solid paraffin in the throttling device at the outlet of the valve body. A hydrogen storage device is provided at the tail of the valve body, and the outlet of the hydrogen storage device is disposed opposite to the throttling device at the outlet of the valve body for using hydrogen throttling to increase the temperature and melt the solid paraffin in the throttling device.

[0006] Further, the pipeline at the inlet of the valve body is connected to the outlet pipeline of the gas production tree, the outlet of the valve body is connected to the pipeline after throttling, and a union is provided at the tail of the valve body for installing the hydrogen storage device.

[0007] Further, the hydrogen storage device includes a throttle valve plug. The throttle valve plug is hermetically connected and disposed at the tail of the valve body. The interior of the throttle valve plug is a hollow structure, and the hollow structure includes an intermediate cavity and an end cavity. The intermediate cavity is communicated with the end cavity. A hydrogen storage tank is installed in the intermediate cavity, and a hydrogen gas communication device and a hydrogen gas opening device are provided in the end cavity. The hydrogen storage tank is communicated with the hydrogen gas communication device, the hydrogen gas communication device is communicated with the hydrogen gas opening device, and the hydrogen gas opening device is hermetically connected to the valve body cavity.

[0008] Further, the hydrogen storage tank includes a middle annular cavity and an end annular cavity. One end of the middle annular cavity is sealed, and the other end is communicated with one end of the end annular cavity. The other end of the end annular cavity is communicated with the hydrogen gas communication device. The middle annular cavity is used for storing hydrogen gas, and the end annular cavity is used for installing a hydrogen gas filling device. The hydrogen gas filling device is used for realizing the sealing, release and injection of hydrogen gas.

[0009] Further, the hydrogen gas filling device includes a first one-way valve housing, a first one-way valve spring, and a first one-way valve ball. The first one-way valve spring and the first one-way valve ball are disposed in the first one-way valve housing. One end of the first one-way valve spring is fixedly abutted against the inner part of the first one-way valve housing, and the other end abuts against the first one-way valve ball. When the first one-way valve spring extends, the first one-way valve ball contacts the inner wall of the first one-way valve housing to realize sealing at one end;

[0010] Further, it further includes a one-way valve head. A plurality of through air channels are provided on the connecting end of the one-way valve head, and the connecting end is connected to the other end of the end annular cavity; a abutting column is further provided on the connecting end, and the abutting column is connected to the hydrogen gas communication device.

[0011] Further, the hydrogen gas connection device includes a second check valve housing, a second check valve spring, and a second check valve ball. The second check valve spring and the second check valve ball are arranged in the second check valve housing. One end of the second check valve spring abuts and is fixed against one side of the second check valve housing, and the other end abuts against one side of the second check valve ball. When the second check valve spring extends, the other side of the second check valve ball contacts the inner wall of the second check valve housing to achieve sealing at one end, and the other side of the second check valve ball abuts against the abutting column of the check valve head.

[0012] Further, the hydrogen gas opening device includes a third check valve housing, a third check valve spring, a third check valve ball, and a third check valve plug. Among them, the third check valve spring and the third check valve ball are arranged in the third check valve housing. One end of the third check valve spring abuts and is fixed against the third check valve housing, and the other end abuts against the third check valve ball. When the third check valve spring extends, the third check valve ball contacts the inner wall of the third check valve housing to achieve sealing at one end; the third check valve plug is hollow inside, and the third check valve plug is fixed in the end cavity of the throttle valve plug and is arranged close to the valve body cavity, and the third check valve plug is connected to one end of the third check valve housing.

[0013] Further, the pre-tightening force of the third check valve spring is greater than the pre-tightening force of the first check valve spring.

[0014] The present invention also provides a method for removing blockages using the above-mentioned paraffin removal and blockage removal device for oil and gas throttle valves. The specific steps are as follows:

[0015] S1 When a blockage occurs, set the temperature reached by the high-temperature heating device according to the pressure value of the pressure gauge, turn on the high-temperature heating device for heating, and stop heating if the pressure gauge value at the throttle valve outlet is the normal production pressure value;

[0016] S2 If the pressure gauge value at the throttle valve outlet cannot be reduced to the normal production pressure value and the pressure in the throttle valve cavity reaches the set value, the hydrogen storage device is opened, and the hydrogen gas in the hydrogen storage device enters the valve body cavity, and the temperature rise caused by hydrogen throttling is used to melt the solid paraffin blocking the throttling device.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The present invention provides a paraffin removal and plugging removal device for an oil and gas throttle valve. By arranging a high-temperature heating device at the inlet of the throttle valve, the solid paraffin entering the throttle valve can be quickly melted, which is beneficial to reducing the probability of the throttle valve being blocked. Since a large amount of paraffin blocks the flow channel of the tungsten carbide valve core, it will be difficult to quickly remove the paraffin only by the high-temperature heating device to resume normal production. Therefore, the present invention also arranges a hydrogen storage device in the valve body, and the hydrogen storage device is arranged opposite to the throttling device at the outlet of the valve body. When the throttling device is severely blocked by paraffin, hydrogen is released, and the paraffin is melted by using the principle of temperature rise during hydrogen throttling. Compared with the throttle valve heating device of the prior art, the present invention provides sufficient heat to melt the paraffin for the removal of paraffin in the throttle valve, can effectively remove the paraffin blockage inside the throttle valve, has a higher paraffin removal efficiency, and can remove the paraffin blockage without shutting down the well during continuous production operation. Compared with the prior art for removing paraffin blockage in the throttle valve, the present invention greatly reduces the paraffin removal intensity of on-site workers and solves the problem that the throttle valve cannot work properly due to paraffin blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Internal structure sectional view of the present invention;

[0020] Figure 2 Internal sectional view of the valve body;

[0021] Figure 3 Enlarged internal sectional view of the hydrogen storage device;

[0022] Figure 4 Enlarged internal sectional view of the high-temperature heating device;

[0023] Figure 5 Schematic three-dimensional structure of the union;

[0024] Figure 6 Internal detailed sectional view of the throttle valve plug;

[0025] Figure 7 Schematic three-dimensional structure of the hydrogen storage tank locking nut;

[0026] Figure 8 Internal detailed sectional view of the hydrogen storage tank;

[0027] Figure 9 Schematic three-dimensional structure of the check valve head;

[0028] Figure 10 Schematic three-dimensional structure of the check valve plug;

[0029] Figure 11 Schematic three-dimensional structure of the outer ceramic insulating sleeve near the outlet side;

[0030] Figure 12 Schematic three-dimensional structure of the outer ceramic insulating sleeve near the inlet side;

[0031] In the attached drawings:

[0032] 1 Union, 1-1 boss, 1-2 internal thread;

[0033] 2 Throttle valve plug, 2-1 circlip groove, 2-2 tapered step, 2-3 tail circlip groove, 2-4 tail internal thread, 2-5 intermediate cavity, 2-6 middle step, 2-7 end cavity, 2-8 end outer surface seal groove, 2-9 end internal thread, 2-10 end circlip groove;

[0034] 3 Hydrogen storage tank lock nut, 3-1 hexagon socket head bolt hole, 3-2 external thread;

[0035] 4 Hydrogen storage tank, 4-1 hexagon socket head bolt hole, 4-2 middle annular cavity, 4-3 middle step, 4-4 end outer surface seal groove, 4-5 end annular cavity, 4-6 end step, 4-7 end internal thread, 4-8 end circlip groove;

[0036] 5 First check valve housing, 6 First check valve spring, 7 First check valve ball, 501, Second check valve housing, 601, Second check valve spring, 701 Second check valve ball;

[0037] 8 Check valve head, 8-1 circular concave surface, 8-2 air flow channel, 8-3 external thread;

[0038] 9 Third check valve housing, 10 Third check valve spring, 11 Third check valve ball, 12 Third check valve plug, 12-1 hexagon internal thread, 12-2 through hole, 12-3 external thread;

[0039] 13 Valve body, 13-1 hydrogen storage device installation cavity, 13-2 high-temperature heating device installation cavity, 13-3 throttling device installation cavity, 13-4 valve body thread;

[0040] 14 Tungsten carbide valve core, 15 Valve core sleeve, 16 Valve core sleeve support seat, 17 Outlet impact-resistant part;

[0041] 18 High-temperature heating wire, 19 Tapered graphite bushing, 20 Inner ceramic insulating sleeve; 21 Outer ceramic insulating sleeve, 21-1 hexagon socket head bolt hole, 21-2 center hole, 21-3 external thread, 21-4 chamfer, 21-5 step; 22 Graphite conducting rod. Detailed implementation mode

[0042] The present invention will be further described below in conjunction with the attached drawings and specific implementation modes.

[0043] As Figures 1 to 12As shown in the figure, a paraffin removal and plugging removal device for an oil and gas throttle valve includes a union 1, a throttle valve plug 2, a hydrogen storage device, a valve body 13, a throttling device, and a high-temperature heating device that are connected in sequence. The hydrogen storage device, the valve body 13, and the throttling device are all hollow or have flow channels. The throttling device is arranged at the outlet of the throttle valve, and its function is to throttle and reduce pressure, which belongs to the existing device of the throttle valve. A hydrogen storage device installation cavity 13-1, a high-temperature heating device installation cavity 13-2, and a throttling device installation cavity 13-3 are arranged in the valve body 13. The hydrogen storage device installation cavity 13-1 is arranged at the tail of the valve body 13, and the high-temperature heating device installation cavity 13-2 is arranged at the inlet of the valve body 13, which can quickly melt the solid paraffin entering the throttle valve and is beneficial to reducing the probability of the throttle valve being blocked. The throttling device installation cavity 13-3 is arranged at the outlet of the valve body 13, and its function is to throttle and reduce pressure, which belongs to the existing device of the throttle valve. The hydrogen storage device installation cavity 13-1 is used to install the hydrogen storage device, and the hydrogen storage device is arranged opposite to the throttling device. Such an arrangement can enable the hydrogen released by the hydrogen storage device to quickly enter the throttling device, realize throttling and temperature increase, which is not only beneficial to paraffin removal and plugging removal, but also beneficial to regularly replacing the hydrogen in the hydrogen storage cylinder. The high-temperature heating device installation cavity 13-2 is used to install the high-temperature heating device, and the throttling device installation cavity 13-3 is used to install the throttling device;

[0044] As Figure 2 shown, the inlet of the valve body 13 is connected to the pipeline at the outlet of the gas production tree, and the outlet of the valve body 13 is connected to the pipeline after throttling;

[0045] As Figure 3 shown, the hydrogen storage device includes a hollow element for storing hydrogen, a hydrogen filling device, a hydrogen connection device, and a hydrogen opening device, which is used to release hydrogen when the throttling device is severely blocked by paraffin, and melts the paraffin by using the principle of throttling and temperature increase of hydrogen to achieve the function of paraffin removal and plugging removal;

[0046] Preferably, as Figure 5 shown, the union 1 is a hollow structure for installing the hydrogen storage device. The inner wall is designed with threads and is connected to the valve body 13. The outer wall is designed with three bosses with a circumferential spacing angle of 120 degrees, which is convenient for the installation and disassembly of the union 1 and the valve body 13, and at the same time ensures a tight connection;

[0047] Specifically, the hydrogen storage device includes a throttle valve plug 2, a hydrogen storage tank lock nut 3, a hydrogen storage tank 4, a hydrogen filling device, a hydrogen connection device, and a hydrogen opening device. On the outer wall of the throttle valve plug 2, there are a snap ring groove 2-1 for clamping and removing the entire hydrogen storage device when disassembling the union 1, a tapered step 2-2 for mating with the union 1, and an outer surface sealing groove 2-8 at the end for sealing with the valve body 13; the inside of the throttle valve plug 2 is a hollow structure, which includes an intermediate cavity 2-5 and an end cavity 2-7. The intermediate cavity 2-5 is connected to the end cavity 2-7 through a step 2-6. At one end of the intermediate cavity 2-5 away from the end cavity 2-7, there are a tail snap ring groove 2-3 and a tail internal thread 2-4 for installing the hydrogen storage tank 4 in the intermediate cavity 2-5 with the hydrogen storage tank lock nut 3; at one end of the end cavity 2-7 away from the intermediate cavity 2-5, there are an end internal thread 2-9 and an end snap ring groove 2-10 for installing the hydrogen connection device and the hydrogen opening device in the end cavity 2-7. According to the attachment Figure 3 , the hydrogen filling device, the hydrogen connection device, and the hydrogen opening device are connected in sequence from left to right, and their connection relationship has a flow path. When the hydrogen storage device needs to work to achieve the effect of wax removal and blockage removal, the flow paths of the three change and open.

[0048] The hydrogen storage tank 4 is a cylindrical component with a sealed tail, hollow in the middle and at the ends, and is installed in the middle cavity of the throttle valve plug 2. Specifically, one end of the hydrogen storage tank 4 is sealed, and there are hexagon socket head cap screw holes 4-1 on the outer wall of the sealed end for matching with the hydrogen storage tank lock nut 3 to fix the hydrogen storage tank 4 in the throttle valve plug 2; on the outer wall of the other end of the hydrogen storage tank 4, there are a plurality of outer surface sealing grooves 4-4 for sealing the hydrogen storage tank 4 and the throttle valve plug 2;

[0049] The inside of the hydrogen storage tank 4 includes a middle annular cavity 4-2 and an end annular cavity 4-5. The middle annular cavity 4-2 is used for storing hydrogen, and the end annular cavity 4-5 is used for installing the hydrogen filling device. One end of the middle annular cavity 4-2 is sealed, and the other end is connected to one end of the end annular cavity 4-5 through a middle step 4-3. At the other end of the end annular cavity 4-5, there is an end step 4-6. The inner wall of the end step 4-6 is provided with an end internal thread 4-7, and the outer wall of the end step 4-6 is provided with an end snap ring groove 4-8;

[0050] The hydrogen filling device includes a first one-way valve housing 5, a first one-way valve spring 6, a first one-way valve ball 7, and a one-way valve head 8. The first one-way valve spring 6 and the first one-way valve ball 7 are arranged in the first one-way valve housing 5. One end of the first one-way valve spring 6 is fixedly abutted against the inner top of the first one-way valve housing 5, and the other end abuts against the first one-way valve ball 7. When the first one-way valve spring 6 extends, the first one-way valve ball 7 contacts the inner wall of the first one-way valve housing 5 to achieve sealing at one end; multiple air flow channels 8-2 are provided on the connecting end of the one-way valve head 8, and an external thread 8-3 is provided on the outer wall of the connecting end. The external thread 8-3 is matched with the internal thread 4-7 at the end of the hydrogen storage tank 4 to fix the one-way valve head 8, so that the end face of the connecting end of the one-way valve head 8 and the end face of the end step 4-6 of the hydrogen storage tank 4 are located on the same plane; a top column is arranged in the middle of the connecting end of the one-way valve head 8. The top column is a cylinder, and a circular concave surface 8-1 is provided on the end face of the cylinder.

[0051] The installation direction of the hydrogen filling device is such that the end with the small one-way valve ball 7 is close to the end step 4-6 of the hydrogen storage tank 4.

[0052] The hydrogen connection device has the same structure as the hydrogen filling device, but the installation direction is opposite. It includes a second one-way valve housing 501, a second one-way valve spring 601, and a second one-way valve ball 701. The second one-way valve spring 601 and the second one-way valve ball 701 are arranged in the second one-way valve housing 501. One end of the second one-way valve spring 601 is fixedly abutted against one side of the second one-way valve housing 501, and the other end abuts against one side of the second one-way valve ball 701. When the second one-way valve spring 601 extends, the other side of the second one-way valve ball 701 contacts the inner wall of the second one-way valve housing 501 to achieve sealing at one end, and the other side of the second one-way valve ball 701 also abuts against the circular concave surface of the one-way valve head 8.

[0053] That is, the end with the second one-way valve ball 701 is arranged close to the middle step 2-6 of the throttle plug. The second one-way valve ball 701 abuts against the circular concave surface 8-1 of the one-way valve head 8. After the hydrogen filling device is installed in the designed position, the one-way valve head 8 will abut against the second one-way valve ball 701, the second one-way valve spring 601 will be compressed, and the second one-way valve ball 701 will move in the direction away from the middle step 2-6 to open the hydrogen connection device to form a connected flow channel.

[0054] The hydrogen gas opening device includes a third check valve housing 9, a third check valve spring 10, a third check valve ball 11, and a third check valve plug 12. The third check valve plug 12 is a cylinder, and a through hole 12-2 is provided inside the cylinder for the flow of gas. An external thread 12-3 is provided on the outer surface of one end of the third check valve plug 12 for mating with the internal thread of the throttle valve plug 2 to achieve the fixation and installation of the hydrogen gas opening device. An internal hexagon thread 12-1 is provided at the other end of the third check valve plug 12 for threaded connection with the third check valve housing 9. The third check valve spring 10 and the third check valve ball 11 are arranged in the third check valve housing 9. One end of the third check valve spring 10 is fixedly abutted against the third check valve housing 9, and the other end of the third check valve spring 10 is abutted against the third check valve ball 11. When the third check valve spring 10 extends, the third check valve ball 11 contacts the inner wall of the third check valve housing 9 to achieve sealing at one end. Its installation direction is that the end with the third check valve ball 11 is close to the inner thread 2-9 at the end of the throttle valve plug 2;

[0055] Preferably, the pre-tightening force of the third check valve spring 10 is greater than the pre-tightening force of the first check valve spring 6;

[0056] Preferably, the hydrogen storage tank locking nut 3 is provided with an external thread 3-2 that mates with the internal thread 2-4 at the tail of the throttle valve plug 2 in an internal hexagon bolt hole 3-1;

[0057] As Figure 4 shown, the high-temperature heating device belongs to a conductive device that converts electrical energy into heat energy and is used to melt solid paraffin into liquid paraffin in the case of a large amount of solid paraffin appearing at the wellhead to prevent it from blocking the throttling device.

[0058] Preferably, the high-temperature heating device includes a high-temperature heating wire 18, a tapered graphite core 19, an inner ceramic insulating sleeve 20, an outer ceramic insulating sleeve 21, and a graphite conducting rod 22. The high-temperature heating wire 18 is made of a conductive heating material; the tapered graphite core 19 is installed in the cavity of the inner ceramic insulating sleeve 20, and the tapered graphite core 19 and the inner ceramic insulating sleeve 20 are hot-fitted into a whole through a hot-fitting process, which not only ensures the sealing performance but also ensures the conductivity and insulation performance; As Figure 11 、 12As shown in the figure, the outer ceramic insulating sleeve 21 is provided with an inner hexagonal bolt hole 21-1 for easy disassembly and compression of the inner ceramic insulating sleeve 20. The central hole 21-2 of the outer ceramic insulating sleeve 21 is used for installing the graphite conductive rod 22. Its outer surface is provided with an external thread 21-3 that is in threaded fit with the internal thread of the valve body 13. The internal cavity of the outer ceramic insulating sleeve 21 is provided with a chamfer 21-4 for easy installation with the inner ceramic insulating sleeve 20. And the step 21-5 provided on the outer ceramic insulating sleeve 21 is used to wrap the inner ceramic insulating sleeve 20 to ensure insulation. The graphite conductive rod 22 is a solid rod-shaped component. One end of the graphite conductive rod 22 is connected to an external power source, and the other end is connected to the high-temperature heating wire 18 through a tapered graphite adapter 19. The high-temperature heating wire 18 is in an energized and heated working state, thus raising the temperature. The heating temperature is set according to the on-site blockage situation. After wax removal and blockage removal are achieved, the power supply can be disconnected to stop heating.

[0059] As Figure 6 shown, the throttling device is used to throttle the high-pressure natural gas at the wellhead to reach the pressure that the downstream pipeline can withstand for transportation. The throttling device includes a tungsten carbide valve core 14, a valve core sleeve 15, a valve core sleeve support seat 16, and an outlet impact-resistant part 17. The tungsten carbide valve core 14, the valve core sleeve 15, the valve core sleeve support seat 16, and the outlet impact-resistant part 17 are all hollow structures with flow channels.

[0060] Adopting the working method of the above-mentioned paraffin removal and blockage removal device for an oil and gas throttle valve, including a paraffin removal stage, a blockage removal stage, and a continuous production and hydrogenation stage. Specifically:

[0061] In the paraffin removal stage, the steps are as follows:

[0062] S1: After the solid paraffin carried during the natural gas production process enters the cavity of the throttle valve, it will accumulate in the flow channel of the tungsten carbide valve core 14, causing blockage and unable to produce normally.

[0063] S2: After the solid paraffin blocks the tungsten carbide valve core 14, it will directly affect the pressure in the cavity of the valve body 13. By observing the change of the pressure gauge, it can be judged whether the throttle valve is blocked by paraffin. When there is an obvious change in the pressure gauge but the pressure does not rise sharply, it indicates that at this time, the paraffin has started to block the tungsten carbide valve core 14 inside the throttle valve.

[0064] S3: By observing the change of the pressure gauge, the circuit of the high-temperature heating device is connected. The graphite conductive rod 22 inputs electric energy to the contact surface of the tapered graphite adapter 19. The tapered graphite adapter 19 transfers the electric energy to the high-temperature heating wire 18. The high-temperature heating wire 18 continuously heats to melt the solid paraffin, ultimately achieving the purpose of paraffin removal. When the pressure gauge value at the outlet of the throttle valve returns to the normal production value, the heating is stopped.

[0065] In the blockage removal stage, the steps are as follows:

[0066] S1: When a large amount of solid paraffin is generated during the natural gas production process, it will seriously block the flow channel of the tungsten carbide valve core 14 of the throttling device, and even directly block the flow channel, resulting in the throttling valve being unable to produce normally. Only by shutting down the well can it be cleaned;

[0067] S2: Due to a large amount of paraffin blocking the flow channel of the tungsten carbide valve core 14, it will be very difficult to quickly remove the paraffin to resume normal production only by using the high-temperature heating device. At this time, the hydrogen storage device will be activated;

[0068] S3: After the hydrogen filling device is installed in the predetermined position, the check valve head 8 will push open the second check valve ball 701 of the hydrogen connection device. The blockage of a large amount of paraffin will cause the internal pressure of the valve body 13 to rise sharply. When the internal pressure of the valve body 13 is greater than the pre-tightening force of the third check valve spring 10, at this time, the third check valve ball 11 will move to the left, forming a flow channel between the hydrogen opening device and the hydrogen connection device. The high-pressure gas acts on the surface of the first check valve ball 7 through the air flow channel 8-2 on the check valve head 8. The designed pre-tightening force of the first check valve spring 6 is less than the pre-tightening force of the third check valve spring 10. Therefore, the check valve of the hydrogen filling device will surely be opened, and the hydrogen in the hydrogen storage tank 4 will be released into the cavity of the valve body 13;

[0069] Preferably, the requirement for the pre-tightening force of the check valve spring is set according to the throttling pressure difference of different well sites.

[0070] S4: The hydrogen in the hydrogen storage tank 4 is released into the valve body 13. By using the principle of hydrogen throttling and temperature rise, the temperature of the hydrogen rises when it flows through the middle hole flow channel of the tungsten carbide valve core 14. The temperature rise caused by hydrogen throttling is used to melt the solid paraffin blocking the flow channel of the tungsten carbide valve core 14, achieving the effect of unblocking.

[0071] Continuous production and hydrogenation stage, the steps are as follows:

[0072] S1: After the unblocking stage is completed, the hydrogen storage tank 4 needs to be refilled with hydrogen for the next unblocking use. After the unblocking is completed, the pressure in the cavity of the valve body 13 will return to the normal value, and the third check valve ball 11 will move to the right and return to the sealed state. As the hydrogen in the hydrogen storage tank 4 is continuously released, the first check valve ball 7 will also move to the right and return to the sealed state;

[0073] S2: Remove the hydrogen storage tank locking nut 3 through the hexagon socket head bolt hole 3-1 provided on the hydrogen storage tank, and then remove the hydrogen storage tank 4 through the hexagon socket head bolt hole 3-1 provided on the hydrogen storage tank. Due to the end circlip groove 4-8 provided, when the hydrogen storage tank 4 is removed, the entire hydrogen storage and filling device will be removed together. At this time, the check valve head 8 no longer applies pressure to the second check valve ball 701 of the hydrogen connection device, and the second check valve ball of the hydrogen connection device moves to the left to achieve the second seal, ensuring that the gas in the cavity of the valve body 13 will not leak;

[0074] S3: After the entire hydrogen storage device is removed, first remove the check valve head 8, and then use a dedicated hydrogen filling device to push open the first check valve ball 7 to refill hydrogen into the hydrogen storage tank 4. The amount of hydrogen used is set according to the paraffin production degree at the wellhead and the severity of the blockage of the throttling device. After filling with hydrogen, remove the hydrogen filling device, and the first check valve ball 7 will automatically rebound to seal the hydrogen in the hydrogen storage tank 4.

[0075] S4: For the hydrogen storage tank 4 after filling with hydrogen, reinstall the check valve head 8, and then install the hydrogen storage tank 4 and the hydrogen storage tank lock nut 3 into the cavity of the throttle plug 2 in sequence for use in the next deblocking stage.

Claims

1. An apparatus for removing wax and unblocking a throttle valve for oil and gas, characterized in that, it includes a throttle valve body (13). At the inlet of the valve body (13), a high-temperature heating device is provided to heat and remove the solid paraffin in the throttling device at the outlet of the valve body (13). At the tail of the valve body (13), a hydrogen storage device is provided. The outlet of the hydrogen storage device is arranged opposite to the throttling device at the outlet of the valve body (13) to use the temperature rise during hydrogen throttling to melt the solid paraffin in the throttling device.

2. The apparatus for removing wax and unblocking a throttle valve for oil and gas according to claim 1, characterized in that, the pipeline at the inlet of the valve body (13) is connected to the pipeline at the outlet of the gas production tree, the outlet of the valve body (13) is connected to the pipeline after throttling, and a union (1) is provided at the tail of the valve body (13) for installing the hydrogen storage device.

3. The apparatus for removing wax and unblocking a throttle valve for oil and gas according to claim 1, characterized in that, the hydrogen storage device includes a throttle valve plug (2). The throttle valve plug (2) is hermetically connected and arranged at the tail of the valve body (13). The inside of the throttle valve plug (2) is a hollow structure, and this hollow structure includes an intermediate cavity (2-5) and an end cavity (2-7). The intermediate cavity (2-5) communicates with the end cavity (2-7). A hydrogen storage tank (4) is installed in the intermediate cavity (2-5). A hydrogen gas connection device and a hydrogen gas opening device are provided in the end cavity (2-7). The hydrogen storage tank (4) communicates with the hydrogen gas connection device, the hydrogen gas connection device communicates with the hydrogen gas opening device, and the hydrogen gas opening device is hermetically connected to the inner cavity of the valve body (13).

4. The apparatus for removing wax and unblocking a throttle valve for oil and gas according to claim 3, characterized in that, the hydrogen storage tank (4) includes a middle annular cavity (4-2) and an end annular cavity (4-5). One end of the middle annular cavity (4-2) is sealed, and the other end communicates with one end of the end annular cavity (4-5). The other end of the end annular cavity (4-5) communicates with the hydrogen gas connection device; the middle annular cavity (4-2) is used for storing hydrogen gas, and the end annular cavity (4-5) is used for installing a hydrogen gas filling device, and the hydrogen gas filling device is used to achieve the sealing, release and injection of hydrogen gas.

5. The apparatus for removing wax and unblocking a throttle valve for oil and gas according to claim 4, characterized in that, the hydrogen gas filling device includes a first check valve housing (5), a first check valve spring (6), and a first check valve ball (7). The first check valve spring (6) and the first check valve ball (7) are arranged in the first check valve housing (5). One end of the first check valve spring (6) is fixedly abutted against the inside of the first check valve housing (5), and the other end abuts against the first check valve ball (7). When the first check valve spring (6) extends, the first check valve ball (7) contacts the inner wall of the first check valve housing (5) to achieve sealing at one end.

6. The apparatus for removing wax and unblocking a throttle valve for oil and gas according to claim 5, characterized in that, It further includes a one-way valve head (8). A plurality of through air channels (8-2) are provided on the connecting end of the one-way valve head (8). The connecting end is connected to the other end of the end annular cavity (4-5). A top contact post is further provided on the connecting end, and the top contact post is connected to the hydrogen gas communication device.

7. An apparatus for removing wax and unblocking a petroleum and natural gas throttle valve according to claim 6, characterized in that the hydrogen gas communication device includes a second one-way valve housing (501), a second one-way valve spring (601), and a second one-way valve ball (701). The second one-way valve spring (601) and the second one-way valve ball (701) are arranged in the second one-way valve housing (501). One end of the second one-way valve spring (601) is fixedly abutted against one side of the second one-way valve housing (501), and the other end is abutted against one side of the second one-way valve ball (701). When the second one-way valve spring (601) extends, the other side of the second one-way valve ball (701) contacts the inner wall of the second one-way valve housing (501) to achieve sealing at one end, and the other side of the second one-way valve ball (701) is abutted against the top contact post of the one-way valve head (8).

8. An apparatus for removing wax and unblocking a petroleum and natural gas throttle valve according to claim 7, characterized in that the hydrogen gas opening device includes a third one-way valve housing (9), a third one-way valve spring (10), a third one-way valve ball (11), and a third one-way valve plug (12). Among them, the third one-way valve spring (10) and the large third one-way valve ball (11) are arranged in the third one-way valve housing (9). One end of the third one-way valve spring (10) is fixedly abutted against the third one-way valve housing (9), and the other end is abutted against the third one-way valve ball (11). When the third one-way valve spring (10) extends, the third one-way valve ball (11) contacts the inner wall of the third one-way valve housing (9) to achieve sealing at one end; the third one-way valve plug (12) is hollow inside, and the third one-way valve plug (12) is fixed in the end cavity (2-7) of the throttle valve plug (2) and is arranged close to the inner cavity of the valve body (13), and the third one-way valve plug (12) is connected to one end of the third one-way valve housing (9).

9. An apparatus for removing wax and unblocking a petroleum and natural gas throttle valve according to claim 8, characterized in that the pre-tightening force of the third one-way valve spring (10) is greater than the pre-tightening force of the first one-way valve spring (6).

10. A method for unblocking using the apparatus for removing wax and unblocking a petroleum and natural gas throttle valve according to any one of claims 1 to 9, characterized in that the specific steps are as follows: S1 When a blockage occurs, set the temperature reached by the high-temperature heating device according to the pressure value of the pressure gauge, turn on the high-temperature heating device for heating. If the pressure gauge value at the outlet of the throttle valve is the normal production pressure value, stop heating; S2 If the pressure gauge value at the outlet of the throttle valve cannot be reduced to the normal production pressure value and the pressure in the throttle valve cavity reaches the set value, the hydrogen storage device is opened, and the hydrogen gas in the hydrogen storage device enters the cavity of the valve body (13), and the temperature rise caused by hydrogen throttling is used to melt the solid paraffin blocking in the throttling device.

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