Coal bed gas horizontal well self-powered gas-liquid multistage separation device

Abstract

The present application relates to the technical field of coal bed gas development, and more particularly to a self-powered gas-liquid multistage separation device for coal bed gas horizontal well. The device uses the kinetic energy of high-speed airflow during gas production of the coal bed gas well, and relies on a magnetic power supply channel to provide power for fluid flow in the separator, thereby reducing the working strength of the extraction pump. Moreover, the device uses the characteristics of the Tesla valve, which restricts high-speed fluid and allows low-speed fluid to pass, to achieve the effect of blocking high-speed airflow and allowing water to enter slowly. Meanwhile, the device further discharges gas by relying on a one-way discharge plate. The device further separates gas and liquid again in the plunger type liquid storage separation bin by using the pushing effect of the magnetic power supply channel on the fluid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coalbed methane development, and particularly relates to a self-powered gas-liquid multistage separation device for a coalbed methane horizontal well. TECHNICAL BACKGROUND

[0002] The fluid state in the gas production stage of a coalbed methane well can be approximated to gas-liquid two-phase flow, and reliable gas-water separation equipment is necessary to ensure normal operation of a drainage pump (screw pump and plunger pump). Existing downhole gas-water separation equipment mainly includes a spiral type and a gravity type, both of which rely on fluid density difference and gravity for gas-water separation, and both of which need to be arranged in a straight well section and a build-up section, and cannot complete gas-water separation in a horizontal section. This leads to the fact that the drainage pump is arranged at a position with a maximum well inclination of about 70°. However, the position is 30-50 m away from the coal seam in the vertical direction, which leads to the fact that the drainage work cannot reduce the coal seam fluid pressure to the maximum extent, and affects the coal seam desorption effect and the gas well yield. Meanwhile, due to the fact that the horizontal well has a very large gas production capacity, the fluid state in the wellbore is unstable, the gas flow rate is fast, and the liquid flow rate is slow, and especially when the gas production capacity is large, the plug flow in the wellbore leads to the fact that the separation effect of the separation equipment is reduced, and the coalbed methane horizontal well is affected. SUMMARY

[0003] In view of the defects and deficiencies in the prior art, the present application provides a self-powered gas-liquid multistage separation device for a coalbed methane horizontal well, which solves the problem that when the gas-water separation equipment is arranged at a position with a large well inclination, the effective working length is insufficient, the gas-water separation cannot be effectively performed, and when the equipment is arranged at a position with a small well inclination, the coal seam pressure relief amplitude is insufficient due to the fact that the drainage equipment is arranged at a position far away from the coal seam in the vertical direction, which seriously affects the gas production capacity.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A self-powered gas-liquid multistage separation device for a coalbed methane horizontal well, comprising a flow-limiting gas-water separator, wherein the flow-limiting gas-water separator comprises:

[0006] an outer sleeve, at least part of which is provided with a screen for fluid inlet and outlet;

[0007] an inner separation cylinder installed in the inner part of the outer sleeve, wherein the inner part of the inner separation cylinder is provided with a one-way flow inlet plate and a one-way flow discharge plate, and the fluid flow direction of the one-way flow inlet plate is arranged to be non-parallel to the fluid flow direction of the one-way flow discharge plate.

[0008] Preferably, in the self-powered gas-liquid multistage separation device for a coalbed methane horizontal well, the fluid flow direction of the one-way flow inlet plate is arranged to be non-parallel to the fluid flow direction of the one-way flow discharge plate.

[0009] Preferably, the one-way flow plate and / or the one-way discharge plate of the coal bed methane horizontal well self-powered gas-liquid multi-stage separation device is a Tesla valve structure.

[0010] A coal bed methane horizontal well self-powered gas-liquid multi-stage separation device includes a magnetic power supply channel, which includes: inner and outer spiral vanes arranged inside and outside the cylinder, respectively, an inner magnetic strip connected to the inner spiral vane, and an outer magnetic strip connected to the outer spiral vane, the inner magnetic strip and the outer magnetic strip being arranged opposite to each other inside and outside the cylinder and having opposite polarities.

[0011] Preferably, the inner spiral and the outer spiral of the coal bed methane horizontal well self-powered gas-liquid multi-stage separation device have opposite fluid directions.

[0012] A coal bed methane horizontal well self-powered gas-liquid multi-stage separation device includes a plunger type liquid storage separation bin, which includes:

[0013] An inner cylinder is provided with a plunger, and the two ends of the plunger are respectively provided with a plurality of first magnetic force blocks; the plunger separates the inner cylinder into two independent liquid storage bins; liquid inlet and outlet are respectively arranged on the two liquid storage bins;

[0014] A liquid inlet valve can move along the outer wall of the plunger cavity to make the liquid inlet on the two liquid storage bins in different states, and a second magnetic force block matched with the first magnetic force block is arranged thereon;

[0015] A liquid outlet valve can move along the outer wall of the plunger cavity to make the liquid inlet and outlet on the same liquid storage bin in different states; a third magnetic force block matched with the first magnetic force block is arranged thereon;

[0016] Among them, the magnetic relationship between the second magnetic force block and the first magnetic force block matched therewith is different from the magnetic relationship between the third magnetic force block and the first magnetic force block matched therewith.

[0017] Preferably, the coal bed methane horizontal well self-powered gas-liquid multi-stage separation device further includes:

[0018] An outer cylinder is sleeved outside the inner cylinder, and a liquid inlet channel and a liquid outlet channel are arranged between the inner cylinder and the outer cylinder, the liquid inlet channel is connected with the liquid inlet, and the liquid outlet channel is connected with the liquid outlet; the inner cylinder and the outer cylinder are respectively provided with exhaust holes.

[0019] Preferably, the coal bed methane horizontal well self-powered gas-liquid multi-stage separation device, the inner part of the two ends of the inner cylinder is respectively provided with a compression spring, and the plunger changes the direction of movement after compressing the compression spring.

[0020] The application discloses a self-powered gas-liquid multistage separation device for a coal bed gas horizontal well.

[0021] The flow-limiting gas-water separator comprises an outer sleeve and an inner separating cylinder, the outer sleeve is provided with a screen for fluid inlet and outlet at least in part, the inner separating cylinder is installed in the inner part of the outer sleeve, and the inner part of the inner separating cylinder is provided with a one-way fluid inlet plate and a one-way fluid discharge plate, wherein the fluid flow directions of the one-way fluid inlet plate and the one-way fluid discharge plate are arranged in a non-parallel manner.

[0022] The magnetic power supply channel comprises inner and outer spiral blades arranged in the inner and outer parts of the cylinder respectively, the inner and outer spiral blades are connected with inner and outer magnetic strips respectively, and the inner and outer magnetic strips are arranged oppositely in the inner and outer parts of the cylinder and are attracted to each other in polarity.

[0023] The plunger type liquid storage separation bin comprises an inner cylinder provided with a plunger, the two ends of the plunger are provided with a plurality of first magnetic blocks respectively, the plunger divides the inner cylinder into two independent liquid storage bins, and liquid inlet and outlet are arranged on the two liquid storage bins respectively.

[0024] The liquid inlet valve can be moved along the outer wall of the plunger cavity to make the liquid inlets on the two liquid storage bins in different states, and the second magnetic block matched with the first magnetic block is arranged on the liquid inlet valve.

[0025] The liquid outlet valve can be moved along the outer wall of the plunger cavity to make the liquid inlets and outlets on the same liquid storage bin in different states, and the third magnetic block matched with the first magnetic block is arranged on the liquid outlet valve.

[0026] The magnetic relationship between the second magnetic block and the matched first magnetic block is different from the magnetic relationship between the third magnetic block and the matched first magnetic block.

[0027] Preferably, the flow-limiting gas-water separator, the magnetic power supply channel and the plunger type liquid storage separation bin are connected through threads.

[0028] Compared with the prior art, the application has the beneficial technical effects that:

[0029] (1) The device can be used in the horizontal section. The existing gas-water separation device cannot be used in a large well, so that the liquid level cannot be lowered to the vicinity of the coal bed, and the pressure reduction range of the reservoir is affected. The device can be arranged in the horizontal section of the horizontal well by means of the internal directional device, so that the pressure reduction range of the extraction work is improved, and the gas production effect of the coal bed gas well is improved.

[0030] (2) improve the pump efficiency. The flow limiting device can reduce the influence of high-speed fluid on the stable operation of the separation equipment, reduce the influence of gas on the separation equipment during the gas production stage, and reduce the gas content of the fluid in the separation equipment through multiple separation, thereby improving the pump efficiency of the extraction pump.

[0031] (3) The power source for the operation of the equipment is partly from the spiral energy supply channel, which reduces the load of the extraction pump.

[0032] (4) There is no valve type moving part in the flow limiting gas-water separator, which greatly reduces the influence of coal powder and sand on the operation of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Position and arrangement of the equipment in the well

[0034] Figure 2 Structure diagram of the one-way flow unloading plate of the flow limiting gas-water separator

[0035] Figure 3 Structure diagram of the one-way flow inlet plate of the flow limiting gas-water separator

[0036] Figure 4 Structure diagram of the flow limiting gas-water separator

[0037] Figure 5 Cross-sectional view of the magnetic energy supply channel

[0038] Figure 6 Side view of the magnetic energy supply channel

[0039] Figure 7 Structure diagram of the plunger type liquid storage separation bin

[0040] Figure 8 Structure diagram of the equipment EMBODIMENT

[0041] As shown in the accompanying Figure 8 , it is a coal seam gas horizontal well self-powered gas-liquid multi-stage separation device, which comprises: a flow limiting gas-water separator, a magnetic energy supply channel, and a plunger type liquid storage separation bin connected in sequence.

[0042] The coal seam gas horizontal well self-powered gas-liquid multi-stage separation device will be described below. Figures 1-7 The coal seam gas horizontal well self-powered gas-liquid multi-stage separation device will be described below.

[0043] 1 Flow limiting gas-water separator

[0044] As shown in the accompanying Figures 1-4 , it is the structure of the flow limiting gas-water separator of the coal seam gas horizontal well self-powered gas-liquid multi-stage separation device.

[0045] The flow-limiting gas-water separator comprises an outer sleeve provided with a screen for fluid inlet and outlet; an inner separation cylinder installed in the outer sleeve, the inner separation cylinder being provided with a one-way inlet plate and a one-way discharge plate, wherein the fluid flow directions of the one-way inlet plate and the one-way discharge plate are not parallel.

[0046] The outer sleeve of the flow-limiting gas-water separator in the embodiment is provided with a punching or screen structure, and fluid can enter and flow out more smoothly. The inner separation cylinder is installed in the outer sleeve through bearings fixed on the outer sleeve, and the inner separation cylinder is internally provided with a one-way inlet plate and a one-way discharge plate. The thickness and weight of the one-way inlet plate are greater than those of the one-way discharge plate, so that the center of gravity of the inner separation cylinder is located at the lower part. When the inner separation cylinder is lowered into the well and reaches the horizontal section, the gravity of the inner separation cylinder can be used to direct the inner separation cylinder, so that the water inlet of the one-way inlet plate is located at the lower part of the inner separation cylinder, the one-way discharge plate is located at the upper part of the inner separation cylinder, and the flow channel bends downward by a certain length after passing through the flow bearing. An installation groove is reserved on the inner separation cylinder, and the number of the one-way inlet plates can be adjusted. The one-way discharge plate is installed at the top, and gas can flow out of the inner separation cylinder from the top.

[0047] The one-way inlet plate in the embodiment is arranged in the inner separation cylinder in a radial manner. The one-way discharge plate is arranged in a circular arc shape and closely contacts the inner separation cylinder wall. The number of the one-way discharge plates can be adjusted as needed. According to the one-way flow-limiting principle of the Tesla valve, when fluid flows in at a high speed, the flow resistance of the fluid is extremely large due to the special hole structure inside. When the fluid flows upward at a slow speed, the flow resistance of the fluid is relatively small. Thus, the effect of preventing high-speed gas flow from entering and allowing slow water flow to enter is achieved, and the influence of the change in the fluid state in the wellbore on the inner separation cylinder is reduced. The plate is arranged in a radial manner in the inner separation cylinder and is matched with the water inlet of the inner separation cylinder through a buckle device.

[0048] The one-way discharge plate in the embodiment adopts the same working principle as the one-way inlet plate, is arranged at the inner top of the inner separation cylinder in an arc shape, and preliminarily separates gas and water in the inner separation cylinder. After the gas bubbles entering from the one-way inlet plate gather at the top of the inner separation cylinder, the gas enters the one-way discharge plate due to the density effect, and is discharged from the inner separation cylinder. Since the one-way discharge plate only allows one-way flow, when the fluid in the wellbore is high-speed gas, the special structure of the one-way discharge plate also prevents high-speed gas from entering.

[0049] After the drainage equipment with the above structure is installed to the predetermined position (in the horizontal section), the flow-limiting gas-water separator completes the orientation work by itself under the action of gravity. The water inlet of the one-way flow plate is located at the lower part of the inner separation cylinder, and the one-way flow discharge plate is located at the upper part of the inner separation cylinder. During operation, the fluid passes through the outer sleeve screen, the one-way flow plate, and enters the inner separation cylinder. The internal fluid of the inner separation cylinder is protected by the one-way flow plate and the one-way flow discharge plate, and the internal fluid is stable, so that the gravity separation of gas and water can be realized, and the fluid after preliminary separation enters the magnetic energy supply channel through the flow passage.

[0050] After the above structure is adopted, the one-way flow plate enters the outer sleeve by the one-way flow limiting principle of the Tesla valve. After the mixed fluid of gas and liquid enters the outer sleeve, due to the flow limiting effect of the one-way flow plate (the Tesla valve allows the fluid to pass through in one direction quickly, and when reversed, the resistance is large, and only slow through), the mixed fluid can only slowly pass through the one-way flow plate into the inner separation cylinder. The fluid entering the inner separation cylinder is preliminarily separated under the action of gravity, and the gas flows out of the inner separation cylinder through the upper one-way flow discharge plate and flows out of the flow-limiting gas-water separator through the screen on the outer sleeve. The liquid enters the magnetic energy supply channel through the flow passage.

[0051] 2. The magnetic energy supply channel.

[0052] As shown in Figures 5-6 , it is the magnetic energy supply channel structure of the coalbed methane horizontal well self-energy gas-liquid multistage separation device of the embodiment.

[0053] The magnetic energy supply channel comprises: inner and outer spiral blades arranged in the inner and outer parts of the cylinder, an inner magnetic strip connected with the inner spiral blade, and an outer magnetic strip connected with the outer spiral blade. The inner magnetic strip and the outer magnetic strip are oppositely arranged in the inner and outer parts of the cylinder and are attracted to each other in polarity. The fluid directions of the inner spiral and the outer spiral are opposite.

[0054] The magnetic energy supply channel structure of the embodiment provides additional energy for the entire gas-liquid multistage separation device during the gas production stage, which is used to push the liquid flow in the channel and reduce the working pressure of the drainage pump. Working mechanism: The magnetic energy supply channel is installed with two corresponding spiral blades of inner and outer spirals, and the inner and outer spiral blades are synchronously operated through the inner and outer magnetic strips. During the gas production stage of the coalbed methane well, the fluid state in the wellbore is two-phase flow (liquid and gas), and the gas flow rate is relatively fast. When the outer spiral blade is rotated by the airflow outside the energy supply channel, the outer magnetic strip installed at the root of the outer spiral blade starts the inner spiral blade in the channel through the inner magnetic strip inside the channel. The inner and outer spiral blades are arranged to be opposite and the same to the fluid motion direction. Under the condition that the downhole condition allows, the acceleration effect on the fluid in the channel can be improved by increasing the length of the magnetic energy supply channel.

[0055] After the magnetic energy supply channel reaches the predetermined position, the outer diameter of the centralizer is larger than the outer diameter of the outer spiral. With the help of the outer spiral and the inner spiral, the kinetic energy of the fluid in the annulus (the annulus between the wellbore and the cylinder of the magnetic energy supply channel) can be transferred to the fluid in the cylinder, thereby promoting the movement of the fluid and reducing the workload of the production pump.

[0056] After adopting the above structure, when the gas-liquid mixed fluid passes through the outside of the cylinder, it pushes the outer spiral to rotate, and through the interaction between the outer magnetic strips and the inner magnetic strips, it drives the internal spiral to rotate, so as to achieve the effect of promoting the movement of the fluid in the channel with the help of the external gas-liquid mixture flow, thereby achieving the effect of supplying energy to the fluid inside the separator. It is also the main power source for the operation of the movable raft plate of the plunger-type liquid storage separation chamber, and the separation of gas and liquid.

[0057] 3 plunger type liquid storage separation tank

[0058] like Figure 7 The figure shows the plunger-type liquid storage and separation chamber structure of the self-powered gas-liquid multi-stage separation device for coalbed methane horizontal wells, including: an inner tube, an outer tube, a liquid inlet valve, and a liquid outlet valve.

[0059] In this embodiment, a plunger is provided in the inner cylinder, and a plurality of first magnetic blocks are provided at both ends of the plunger; the plunger divides the inner cylinder into two independent liquid storage compartments; the two liquid storage compartments are provided with a liquid inlet and a liquid outlet respectively;

[0060] The liquid inlet valve can move along the outer wall of the plunger cavity to place the liquid inlets on the two liquid storage bins in different states, and a second magnetic block is provided thereon to cooperate with the first magnetic block;

[0061] The liquid outlet valve can move along the outer wall of the plunger cavity so that the liquid inlet and the liquid outlet on the same liquid storage tank are in different states; a third magnetic block is provided on it to cooperate with the first magnetic block;

[0062] The magnetic relationship between the second magnetic block and the first magnetic block matched therewith is different from the magnetic relationship between the third magnetic block and the first magnetic block matched therewith.

[0063] The outer cylinder is sleeved on the outside of the inner cylinder, and a liquid inlet channel and a liquid outlet channel are provided between the inner cylinder and the outer cylinder. The liquid inlet channel is connected to the liquid inlet, and the liquid outlet channel is connected to the liquid outlet; the inner cylinder and the outer cylinder are respectively provided with exhaust holes.

[0064] The plunger-type liquid storage and separation chamber in this embodiment utilizes an inner and outer cylinder structure. Inside the inner cylinder is a movable, "I"-shaped raft plate that slides left and right. Each raft plate is equipped with magnetic blocks and one-way vents. The magnetic blocks interact with the magnetic blocks on the inlet and outlet valves to open and close the valves when the raft plate moves left and right. Simultaneously, the one-way vents allow gas from the left and right liquid storage chambers to be discharged.

[0065] In this embodiment, the liquid outlet valve and the liquid inlet valve are designed as sliding valves, and magnetic induction blocks are installed at both ends of the valves. The opening and closing of the valves are realized by the interaction between the magnetic induction blocks and the magnetic blocks of the movable raft.

[0066] As a preferred embodiment, the liquid outlet valve is installed with a counterweight, which is heavier than the liquid inlet valve. This makes the weight of the plunger type liquid storage separation bin asymmetric, and the center of gravity is close to the liquid outlet valve. Therefore, the inner cylinder can realize self-rotation orientation by the action of the bearing and gravity.

[0067] As shown in Figure 8 When the coalbed methane horizontal well self-powered gas-liquid multi-stage separation device of this embodiment is working, the drainage equipment starts to operate, and the initial stage is a one-way flow state. (Methane in the coal bed is not desorbed, there is no gas production in the well, and the liquid in the wellbore enters the plunger type liquid storage separation bin through the flow-limiting gas-water separator and the magnetic power supply channel.) The fluid runs under the suction action of the drainage equipment.

[0068] After the coal bed starts to desorb, the gas in the annulus flows through the outer spiral of the magnetic power supply channel, pushing the outer spiral and the inner spiral to rotate, and providing power to the fluid inside the magnetic power supply channel.

[0069] The plunger type liquid storage separation bin, after the column reaches the predetermined position, due to the upper and lower asymmetry of the movable raft, the gravity center is lower, (the upper part of the two vertical plates of the movable raft has a one-way exhaust hole, so the weight of the upper and lower parts is asymmetric, and the gravity center is lower) under the action of gravity, the movable raft automatically completes the adjustment in the up-down direction. The inner cylinder rotates automatically to reach the working position that A1 and A2 are on the top and B1 and B2 are on the bottom. When passing through the vertical section and the build-up section of the wellbore, the movable raft is moved to the lower part of the liquid storage separation bin (the left side in the figure, that is, the position close to the connection of the magnetic force channel) under the action of gravity, at this time A1 is opened, B1 is closed, A2 is closed, and B2 is opened. After the drainage pump starts to operate, under the action of the drainage pump suction and the magnetic force energy supply channel (when there is gas production), the liquid enters the liquid inlet channel through the bearing, enters the left liquid storage bin through A1, and the movable raft moves to the right. The liquid in the right liquid storage bin enters the liquid outlet channel through B2, leaves the plunger type liquid storage separation bin through the right bearing, and enters the drainage pump. When the movable raft moves to the right, the turning spring is compressed, and the liquid inlet valve and the liquid outlet valve are pushed to move to the left, which causes A1 to be closed, A2 to be opened (the magnetic pole direction of the magnetic block is opposite to A2), B1 to be opened, and B2 to be closed (the magnetic pole direction of the magnetic block is the same as B2). At this time, under the action of the magnetic force energy supply channel (in the gas production stage) and the drainage pump suction, the fluid enters the right liquid storage bin and pushes the movable raft to move to the left. At the same time, due to the closing of B2, the fluid in the left liquid outlet bin is sucked away under the action of the drainage pump suction, and due to the closing of A1, the fluid pressure in the left liquid storage bin is reduced, so the movable raft moves to the left. When the movable raft moves to the position of the turning spring, the spring is compressed, and the magnetic block pushes the liquid inlet valve and the liquid outlet valve to move, A1 is opened, A2 is closed, B1 is closed, and B2 is opened. Under the action of the magnetic force energy supply channel and the drainage pump suction, the movable raft moves to the right, the fluid in the right liquid storage bin enters the liquid outlet channel, and enters the drainage pump. The above-mentioned cycle is repeated. Under the action of the drainage pump suction, the fluid moves to the left along with the movable raft, and due to the fact that the liquid inlet valve and the liquid outlet valve are long and integral, A2 is opened and B2 is closed.

[0070] When the well contains gas-liquid two-phase fluid (methane desorption in the coal seam), the small gas bubbles entering the liquid outlet bin realize gravity differentiation in the relatively stable environment of the liquid outlet bin. Since the magnetic force energy supply channel pushes the liquid into the liquid storage bin, the liquid storage bin is in a positive pressure state, and the gas can leave the plunger type liquid storage separation bin through the one-way exhaust hole arranged on the movable raft, the inner cylinder exhaust hole and the outer cylinder exhaust hole. At the same time, the fluid disturbance in the annulus is limited by the one-way exhaust hole and will not affect the normal operation of the entire plunger type liquid storage separation bin.

[0071] As shown in Figures 1-8 After adopting the above structure, the present embodiment has the following differences compared with the prior art:

[0072] (1) Operating mode is different. The fluid flow power of conventional gas-liquid separation device comes from the pumping pump. The device relies on the kinetic energy of high gas flow during the production of coalbed gas well, and relies on the magnetic power supply channel to provide power for the fluid flow in the separator, which reduces the working strength of the pumping pump.

[0073] (2) Unique flow limiting method. The operating mechanism of conventional gas-liquid separation device relies on gravity, and realizes separation by means of the difference in gas-liquid and liquid density. Due to the instability of fluid caused by the fast gas flow and slow liquid flow during the production of coalbed gas well, the high-speed gas flow seriously affects the operation of conventional gravity separation device, and the separation effect is very poor. The device relies on the characteristics of tesla valve to limit high-speed fluid and allow low-speed fluid to pass, to achieve the effect of blocking high-speed gas flow and allowing water flow to enter slowly. At the same time, rely on one-way unloading plate to further discharge gas.

[0074] (3) Unique mechanical structure. The flow-limiting gas-water separator realizes gas-liquid separation by using flow-limiting channel, without mechanical valves, filter screens and other structures, and the influence of coal powder, sand and other factors on the operation of the separator is obviously smaller than that of conventional gas-water separation equipment.

[0075] (4) Multiple gas-liquid separation. With the help of the pushing effect of the magnetic power supply channel on the fluid, the gas-liquid is further separated again in the plunger type liquid storage separation bin.

Claims

1. A self-powered gas-liquid multistage separation device for coalbed methane horizontal well, comprising a flow-restricted gas-water separator, characterized in that, The flow-limiting air-water separator comprises: an outer sleeve, at least a part of which is provided with a screen for fluid inlet and outlet; an inner separation cylinder installed inside the outer sleeve, the inner separation cylinder being provided with a one-way fluid inlet plate and a one-way fluid discharge plate inside; wherein the fluid flow direction of the one-way fluid inlet plate is not parallel to the fluid flow direction of the one-way fluid discharge plate; the one-way fluid inlet plate and / or the one-way fluid discharge plate is a flow structure of Tesla valve structure.

2. The self-powered gas-liquid multistage separation device for coalbed methane horizontal well of claim 1, further comprising a magnetic power supply channel, characterized in that, The magnetic energy supply channel comprises: inner and outer spiral vanes arranged inside and outside the cylinder respectively, an inner magnetic strip connected with the inner spiral vane, and an outer magnetic strip connected with the outer spiral vane, the inner magnetic strip and the outer magnetic strip being oppositely arranged inside and outside the cylinder and having opposite polarities.

3. The self-powered gas-liquid multi-stage separation device for a coalbed methane horizontal well according to claim 2, characterized in that, The fluid directions of the inner spiral and the outer spiral are opposite.

4. The self-powered gas-liquid multi-stage separation device for coalbed methane horizontal well of claim 3, further comprising a plunger type liquid storage separation bin, characterized in that, The plunger type liquid storage separation bin comprises: an inner cylinder provided with a plunger inside, the two ends of the plunger being provided with a plurality of first magnetic blocks respectively; the plunger separates the inner cylinder into two independent liquid storage bins; the two liquid storage bins are respectively provided with liquid inlet and outlet openings; a liquid inlet valve movable along the outer wall of the plunger cavity to make the liquid inlet openings of the two liquid storage bins in different states, the liquid inlet valve being provided with second magnetic blocks matched with the first magnetic blocks; a liquid outlet valve movable along the outer wall of the plunger cavity to make the liquid inlet and outlet openings of the same liquid storage bin in different states, the liquid outlet valve being provided with third magnetic blocks matched with the first magnetic blocks; wherein the magnetic relationship between the second magnetic blocks and the matched first magnetic blocks is different from the magnetic relationship between the third magnetic blocks and the matched first magnetic blocks.

5. The self-powered gas-liquid multi-stage separation device for a coalbed methane horizontal well according to claim 4, characterized in that, Further comprising: an outer cylinder sleeved outside the inner cylinder, the inner cylinder and the outer cylinder being provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel being connected with the liquid inlet opening, and the liquid outlet channel being connected with the liquid outlet opening; the inner cylinder and the outer cylinder being respectively provided with exhaust holes.

6. The self-powered gas-liquid multi-stage separation device for a coalbed methane horizontal well according to claim 4, characterized in that, The inner part of the two ends of the inner cylinder is respectively provided with a compression spring, and the plunger changes the moving direction after compressing the compression spring.

7. A self-powered gas-liquid multi-stage separation device for coalbed methane horizontal wells, characterized in that, It comprises: a flow-limiting air-water separator, a magnetic energy supply channel, and a plunger type liquid storage separation bin connected in sequence; wherein the flow-limiting air-water separator comprises an outer sleeve and an inner separation cylinder, the outer sleeve being provided with a screen for fluid inlet and outlet at least in part; the inner separation cylinder being installed inside the outer sleeve, the inner separation cylinder being provided with a one-way fluid inlet plate and a one-way fluid discharge plate inside; wherein the fluid flow direction of the one-way fluid inlet plate is not parallel to the fluid flow direction of the one-way fluid discharge plate; the one-way fluid inlet plate and / or the one-way fluid discharge plate is a flow structure of Tesla valve structure; the magnetic energy supply channel comprises: inner and outer spiral vanes arranged inside and outside the cylinder respectively, the inner spiral vane and the outer spiral vane being connected with an inner magnetic strip and an outer magnetic strip respectively, the inner magnetic strip and the outer magnetic strip being oppositely arranged inside and outside the cylinder and having opposite polarities; The plunger type liquid storage separation bin comprises an inner cylinder, a plunger arranged in the inner cylinder, and a plurality of first magnetic force blocks arranged at two ends of the plunger respectively; the plunger separates the inner cylinder into two independent liquid storage bins; a liquid inlet and a liquid outlet are arranged on each of the two liquid storage bins respectively; A liquid inlet valve is movable along the outer wall of the plunger cavity to make the liquid inlets on the two liquid storage bins in different states, and a second magnetic force block matched with the first magnetic force block is arranged on the liquid inlet valve; A liquid outlet valve is movable along the outer wall of the plunger cavity to make the liquid inlet and the liquid outlet on the same liquid storage bin in different states, and a third magnetic force block matched with the first magnetic force block is arranged on the liquid outlet valve; The magnetic relationship between the second magnetic force block and the matched first magnetic force block is different from the magnetic relationship between the third magnetic force block and the matched first magnetic force block.

8. A coalbed methane horizontal well self-powered gas-liquid multistage separation method, using the coalbed methane horizontal well self-powered gas-liquid multistage separation device of claim 7, characterized in that, The flow limiting gas-water separator, the magnetic power supply channel, and the plunger type liquid storage separation bin are connected through a screw thread.

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