Electrolysis-assisted drainage gas recovery device and method

Abstract

The invention discloses an electrolysis-assisted drainage gas production device and method, and relates to the technical field of oil and gas development engineering, the electrolysis-assisted drainage gas production device comprises a hydrogen electrode, an oxygen electrode, a foam maker and an oxygen discharge pipe, the foam maker is detachably arranged in an oil pipe and comprises a throttling cover provided with a plurality of groups of throttling holes, and the hydrogen electrode is detachably arranged at the position below the foam maker in the oil pipe. The hydrogen electrode is insulated from an oil pipe, the hydrogen electrode can make contact with a liquid accumulation layer, the oxygen discharging pipe vertically stretches into the well and makes contact with the liquid accumulation layer, the oxygen electrode is arranged in the oxygen discharging pipe and makes contact with the liquid accumulation layer through a bottom opening of the oxygen discharging pipe, the hydrogen electrode and the oxygen electrode can be connected to an external power source to form an electrolysis loop, the hydrogen electrode is a cathode, and the oxygen electrode is an anode. The oxygen electrode is an anode; according to the invention, hydrogen generated by electrolyzing underground accumulated liquid is used for supplementing energy for produced gas, and meanwhile, the foam generation equipment is arranged for generating foam, so that the removal effect of the underground formation water accumulated liquid is obviously improved, the smoothness in the well is effectively kept, and the gas production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas development engineering, and in particular to an electrolysis-assisted drainage and gas production device and method. Background Art

[0002] In the development process of gas wells, affected by water production and formation energy, there is often a problem of liquid accumulation at the bottom of the well. The existence of liquid accumulation at the bottom of the well will seriously affect the production efficiency of the gas well. Therefore, in response to the problem of liquid accumulation, the industry has also developed a variety of methods for drainage and gas production, such as foam drainage gas production method, gas lift drainage gas production method, and continuous tubing drainage gas production method. Among them, the foam drainage gas production method is to add corresponding foaming agents to the liquid accumulation layer. The accumulated liquid is stirred by the produced gas and converted into foam that is easily carried by the airflow, so that it is carried out of the well together with the produced gas during the gas production process. This method has the characteristics of simple structure and low construction cost, and has been widely used in this field. However, this method has very limited effect on low-pressure and low-yield gas wells with insufficient formation energy. The amount of foam produced is small, and the amount of liquid carried by the produced gas is also low, which affects the effect of the foam drainage method. Obviously, it is necessary to set up foaming equipment specifically for increasing foam production. However, some sand particles in the liquid accumulation layer can also be carried out by the foam formed by the liquid accumulation layer, which may clog the relevant foaming equipment and affect the normal discharge of the foam. These sand particles also need to be processed. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide an electrolysis-assisted drainage and gas production device and method, which synergizes the two methods of electrolysis of formation water to produce gas and energy and generate foam, and processes the sand particles carried in the foam, thereby effectively improving the efficiency of drainage and gas production and ensuring the normal operation of the foam drainage method.

[0004] In order to solve at least one of the above technical problems, the technical solution provided by the present invention is:

[0005] An electrolysis-assisted water drainage and gas production device comprises a hydrogen electrode, a foamer, and an oxygen exhaust pipe, wherein the foamer is detachably arranged inside an oil pipe and above a liquid accumulation layer at the bottom of a well, and the foamer comprises at least one throttle cover capable of completely dividing the oil pipe into two parts, an upper part and an lower part, and a plurality of throttle holes are vertically arranged on the throttle cover, which can allow gas entering the oil pipe to pass through the throttle cover from bottom to top;

[0006] The hydrogen electrode is detachably arranged in the hydrogen electrode short section, the hydrogen electrode short section has the same diameter as the oil pipe, and is detachably arranged at the bottom of the oil pipe, and the hydrogen electrode is immersed in the liquid accumulation layer, and its position is higher than the perforation layer;

[0007] The oxygen exhaust pipe connected to the ground extends vertically into the well and is immersed in the liquid accumulation layer, wherein a short section of an oxygen electrode with an expanded diameter is detachably provided at the bottom of the oxygen exhaust pipe and immersed in the liquid accumulation layer, and a cylindrical separation sleeve is detachably sleeved at the bottom of the oxygen electrode short section, and a through hole at the top of the separation sleeve is sleeved on the outer surface of the oxygen electrode short section so that the interior of the oxygen exhaust pipe is connected with the interior of the separation sleeve, and a gas-liquid separator that only allows liquid to enter the interior of the separation sleeve is provided at the bottom of the separation sleeve, and the oxygen electrode is arranged in the oxygen electrode short section and immersed in the liquid accumulation layer, and the hydrogen electrode and the oxygen electrode can be connected to an external power supply to form an electrolysis circuit, wherein the hydrogen electrode is the cathode and the oxygen electrode is the anode.

[0008] One embodiment of the present invention is that a fixing ring is detachably provided inside the hydrogen electrode short section, and the fixing ring can completely separate the inside of the hydrogen electrode short section into two parts, an upper part and an lower part, wherein the fixing ring is provided with a plurality of groups of air guide holes connecting the upper and lower parts, and the hydrogen electrode is arranged at the center of the fixing ring and connected to the ground through a cable.

[0009] Furthermore, the fixing ring is made of insulating ceramic material and is fixed inside the hydrogen electrode short section by means of threaded connection.

[0010] Furthermore, a fixing ring is detachably provided inside the oxygen electrode short section, and the oxygen electrode is arranged through the center of the fixing ring and is connected to the ground through a cable.

[0011] In one embodiment of the present invention, the foamer comprises a separation cylinder and a throttle cover, wherein the throttle cover is a dome structure with an arc surface facing upward, which is detachably arranged inside the oil pipe to completely separate the oil pipe into an upper and lower part, and the dome part is vertically provided with a plurality of groups of throttle holes connecting the upper and lower parts separated by the throttle cover;

[0012] The separation cylinder is detachably coaxially arranged on the inner surface of the oil pipe and connected to the edge of the throttle cover. A sand control plate is also horizontally arranged inside the separation cylinder to completely separate the separation cylinder into two parts, the upper and lower parts. The sand control plate is vertically penetrated by a plurality of groups of sand control holes. Sand control covers are arranged one by one below the sand control holes. The sand control covers are vertical tubes with continuously reduced diameters from top to bottom, and the uppermost end of the sand control covers is connected to the sand control holes with equal diameters.

[0013] The upper surface of the sand control plate is provided with an atomizing power supply and a plurality of atomizing sheets. The atomizing sheets are arranged above the sand control holes one by one, and the atomizing holes on the atomizing sheets are all connected with the sand control holes.

[0014] In addition, the present invention also discloses a method for electrolysis-assisted drainage gas recovery using the above device, comprising the following steps:

[0015] Step S1: according to the device structure, an oxygen discharge pipe immersed in the bottom hole liquid layer is arranged in the wellbore annulus, an oxygen electrode immersed in the bottom hole liquid layer and connected to the ground is arranged inside the oxygen discharge pipe, a bubbler and a hydrogen electrode connected to the ground are arranged in sequence from top to bottom in the oil pipe, wherein the hydrogen electrode is immersed in the liquid layer and located above the perforation layer;

[0016] Step S2: Power is supplied to the hydrogen electrode and the oxygen electrode to form an electrolysis circuit to electrolyze the liquid accumulation layer, so that the gas generated at the oxygen electrode is discharged from the wellbore along the oxygen exhaust pipe, and the gas generated at the hydrogen electrode enters the oil pipe together with the produced gas and passes through the bubbler to be produced.

[0017] In some embodiments, the oxygen exhaust pipe is connected to a negative pressure source on the ground.

[0018] In some embodiments, the oxygen exhaust pipe is connected to a ground chlorine separation device.

[0019] The technical effects of the present invention are:

[0020] 1. The present invention generates hydrogen to replenish the produced gas by electrolyzing formation water underground, and is provided with a foam generating device for generating foam, so that the carrying efficiency is improved. Meanwhile, the electrolysis itself can also consume formation water, thereby significantly improving the removal effect of formation water accumulation at the bottom of the well, effectively maintaining the well unobstructed, improving the gas production rate, and expanding the scope of application of the foam drainage method.

[0021] 2. The present invention is provided with a sand removal device to remove the sand particles carried into the throttle cover along with the foam, so as to prevent the sand particles from clogging the throttle cover, ensure that the foam can be normally generated in the foamer, and ensure the normal construction of the foam drainage.

[0022] 3. The present invention can effectively separate the anode product and the cathode product to avoid the risk of combustion and explosion caused by mixing the two, thereby effectively ensuring construction safety.

[0023] 4. Compared with other drainage methods, the electrolysis method adopted in the present invention has a simple equipment structure and low construction and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a top view of the fixing ring of the present invention;

[0027] Figure 3 is a cross-sectional view of the foamer in the oil pipe of the present invention;

[0028] Figure 4 is an axonometric view of the foamer of the present invention;

[0029] Figure 5 is a cross-sectional view of the sand control plate of the present invention;

[0030] Figure 6 is a cross-sectional view of the short section of the oxygen electrode in the present invention;

[0031] In the figure, 1-oil pipe, 2-hydrogen electrode short section, 3-hydrogen electrode, 4-fixing ring, 5-foamer, 6-oxygen electrode, 7-oxygen electrode short section, 8-oxygen exhaust pipe, 9-casing, 10-liquid accumulation layer, 11-perforation layer, 12-separation sleeve, 13-gas-liquid separator, 41-gas guide hole, 51-separation cylinder, 52-throttle cover, 53-throttle hole, 54-sand control plate, 541-sand control hole, 542-atomization sheet, 543-sand control cover, 544-atomization power supply. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the embodiments and drawings.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0034] Example:

[0035] See also Figure 1An electrolysis-assisted drainage and gas production device includes a hydrogen electrode 3, a foamer 5, and an electrolysis tube 12, wherein the foamer 5 is detachably arranged inside the oil pipe 1 and located above the liquid accumulation layer 10, and the foamer 5 includes at least one throttle cover 52 that can completely separate the oil pipe 1 into two parts, the upper and lower parts, and the throttle cover 52 is vertically provided with multiple groups of throttle holes 53, which can allow the gas entering the oil pipe 1 to pass through the throttle cover 52 from bottom to top. In actual production, the formation produced water gathers at the bottom of the well to form the liquid accumulation layer 10 , covering the perforated layer 11 from which natural gas is produced. In the prior art, a foaming agent is usually injected through the annulus of the oil pipe 1. The natural gas produced from the perforated layer 11 is stirred in the liquid accumulation layer 10 to which the foaming agent is added to generate foam, and is carried by the natural gas flow up along the oil pipe 1 to the ground. Therefore, in this embodiment, after the natural gas carries the foam to the throttling cover 52 with a porous structure, the accumulated liquid entrained by the foam can generate more stable foam in the throttling hole 53, thereby effectively improving the carrying efficiency of the natural gas for the foam.

[0036] In this embodiment, the foamer 5 includes a separation cylinder 51 and a throttling cover 52. Figure 3 , Figure 4 It can be seen that the throttle cover 52 is a dome structure with an arc surface facing upward, which is detachably arranged inside the oil pipe 1 to completely separate the oil pipe 1 into two parts, the upper and lower parts. The dome part is vertically provided with multiple groups of throttle holes 53 connecting the upper and lower parts separated by the throttle cover 52, and the separation cylinder 51 is detachably coaxially arranged inside the oil pipe 1 and connected to the contact part between the throttle cover 52 and the oil pipe 1, see Figure 5 A sand-proof plate 54 is also horizontally arranged inside the separation cylinder 51 to completely separate the separation cylinder 51 into two parts, the upper and lower parts. A plurality of groups of sand-proof holes 541 are vertically arranged on the sand-proof plate 54 to connect the upper and lower surfaces of the sand-proof plate 54. Sand-proof covers 543 are arranged one by one below the sand-proof holes 541. The sand-proof covers 543 are vertical tubes with a continuously reduced diameter from top to bottom, and the upper end of the sand-proof covers 543 is connected to the sand-proof holes 541 with equal diameters.

[0037] An atomizing power source 544 and a plurality of atomizing sheets 542 are provided on the upper surface of the sand-proof plate 54. The atomizing sheets 542 are arranged one by one above the sand-proof holes 541, and the atomizing holes on the atomizing sheets 542 are all connected to the sand-proof holes 541. It can be seen that a group of sand-proof plates 54 are actually provided below the throttling cover 52. Since the accumulated liquid layer also contains a large amount of sand particles, when the natural gas carries the foam upward, the foam surface will carry a certain amount of sand particles in addition to the accumulated liquid. These sand particles may block the throttling holes 53 widely present on the foamer 5 when passing through the foamer 5. Therefore, a sand-proof plate 54 with an atomizing sheet 542 is used to reduce and control the amount of sand particles entering the foamer 5. Among them, the sand-proof cover 543 is a positive funnel-shaped structure. To ensure the effect, the reduced diameter portion at the bottom can reduce the possibility of sand particles entering the sand-proof holes 541. On the one hand, it can generate swirling turbulence outside the sand control cover 543, disturbing the flow direction of the gas-liquid flow at the bottom of the sand control cover 543, so that most of the sand particles carried in the gas-liquid flow escape from the gas-liquid flow, effectively reducing the amount of sand carried in the fluid, and the atomizing holes on the atomizing sheet 542 are all connected with the sand control hole 541. The basic structure of the atomizing sheet 542 is a vibrating sheet with an atomizing hole, and its vibration energy is provided by the atomizing power supply 544. When the fluid passes through the atomizing hole, the vibration generated by it breaks up the fluid into smaller droplets, thereby producing an atomization effect. Therefore, when the atomizing hole of the atomizing sheet 542 in this embodiment is connected with the sand control hole 541, the liquid in the gas-liquid flow entering the sand control hole 541 can pass through the atomizing hole smoothly, while a small amount of solid as sand particles is difficult to pass through the atomizing hole, thereby achieving full removal of sand particles in the gas-liquid flow.

[0038] The hydrogen electrode 3 and the oxygen electrode 6 constitute the electrolysis auxiliary part of the present invention, which is composed of Figure 1 As shown, the hydrogen electrode 3 is detachably arranged in the hydrogen electrode short section 2 and connected to the ground through a cable. The hydrogen electrode short section 2 has the same diameter as the oil pipe 1 and is detachably arranged at the bottom of the oil pipe 1. Figure 2 A fixing ring 4 capable of completely separating the hydrogen electrode short section 2 is detachably provided inside the fixing ring 4, and a plurality of gas guide holes 41 are provided through the fixing ring 4 to allow gas to pass through the fixing ring 4. The hydrogen electrode 3 is provided through the fixing ring 4 and is immersed as a whole at a position where the bottom hole liquid accumulation layer 10 is higher than the perforation layer 11.

[0039] See also Figure 1, corresponding to the hydrogen electrode 3, the present invention uses an oxygen electrode 6 as the anode of electrolysis, and the oxygen discharge pipe 8 where the oxygen electrode 6 is located extends vertically into the well and is immersed in the liquid accumulation layer 10. It can be directly set in the annulus, and in some well groups developed with double oil pipes, the oxygen discharge pipe 8 can also be set inside another group of oil pipes 1 outside the oil pipes 1 where the hydrogen electrode 3 is located, so as to facilitate gas discharge. The bottom of the oxygen discharge pipe 8 is also detachably provided with an oxygen electrode short section 7 with an expanded diameter immersed in the liquid accumulation layer 10, and the oxygen electrode 6 is set in the oxygen electrode short section 7. Similar to the hydrogen electrode short section 2, the oxygen electrode short section 7 is also detachably provided with a fixing ring 4. The oxygen electrode 6 is set through the center of the fixing ring 4 and is connected to the ground through the cable inside the oxygen discharge pipe 8.

[0040] like Figure 6 As shown, a cylindrical separation sleeve 12 is detachably sleeved on the oxygen electrode short section 7, and a through hole at the top of the separation sleeve 12 is sleeved on the outer surface of the oxygen electrode short section 7, so that the interior of the oxygen discharge pipe 8 is connected with the interior of the separation sleeve 12, and a gas-liquid separator 13 is provided at the bottom of the separation sleeve 12, which only allows liquid to enter the interior of the separation sleeve 12 and discharges gas to the outside of the separation sleeve 12, such as the gas anchor used in the prior art. Under such a structure, the liquid in the bottom hole accumulating liquid can pass through the gas-liquid separator 13 to enter the interior of the separation sleeve 12 and contact the oxygen electrode 6, and is electrolyzed by the oxygen electrode 6 to produce oxygen and discharged to the ground along the oxygen discharge pipe 8, while the natural gas, hydrogen and other gases that may be carried in the accumulating liquid cannot pass through the gas-liquid separator 13 and can only be sent to the ground along the oil pipe 1, thereby ensuring that the oxygen produced by the oxygen electrode 6 will not contact the gas, and minimizing the risk of explosion caused by gas mixing, wherein the depth of the oxygen electrode 6 and the oxygen electrode short section 7 below the bottom hole liquid level can also be arbitrarily determined according to actual needs, and is not limited to the accumulating layer 10 or the perforated layer 11.

[0041] During construction, the hydrogen electrode 3 will be energized as the cathode, and the oxygen electrode 4 will be energized as the anode. The density of oxygen produced by anode electrolysis is lower than that of water. Under the action of the water seal, it can be automatically discharged to the ground along the oxygen discharge pipe 8, generating oxygen at the oxygen electrode and hydrogen at the cathode. The water in the liquid accumulation layer 10 at the bottom of the well is electrolyzed, and the hydrogen obtained after cathode electrolysis will be mixed with the produced natural gas in the formation to supplement the energy of the natural gas. At the same time, this process also consumes the accumulated liquid, which achieves the effect of replenishing energy for the bubble-carrying gas on the one hand and reducing the total amount of accumulated liquid on the other.

[0042] In addition, in some embodiments, the diameter of the portion of the oxygen exhaust pipe 6 below the oxygen electrode 4 is larger than the portion above the oxygen electrode 4, that is, Figure 1 As shown, the lower part is larger than the upper part. This can save materials for making the oxygen exhaust pipe 6, reduce the space it occupies in the annulus, and reduce the construction difficulty of arranging the oxygen exhaust pipe 6. On the other hand, the thinner upper part of the oxygen exhaust pipe 6 can also produce a certain capillary effect, which is convenient for conducting the bubbles formed by oxygen to the ground.

[0043] Furthermore, the method for electrolysis-assisted drainage and gas production based on the electrolysis-assisted drainage and gas production method device mainly includes the following steps:

[0044] Step S1: according to the device structure, an oxygen discharge pipe immersed in the bottom liquid layer is arranged in the wellbore, an oxygen electrode immersed in the bottom liquid layer and connected to the ground is arranged inside the oxygen discharge pipe, a bubbler and a hydrogen electrode connected to the ground are arranged in sequence from top to bottom in the oil pipe, wherein the hydrogen electrode is immersed in the liquid layer and located above the perforation layer;

[0045] Step S2: Power is supplied to the hydrogen electrode and the oxygen electrode to form an electrolysis circuit to electrolyze the liquid accumulation layer, so that the gas generated at the oxygen electrode is discharged from the wellbore along the oxygen exhaust pipe, and the gas generated at the hydrogen electrode enters the oil pipe together with the produced gas and passes through the bubbler to be produced.

[0046] There is a risk of explosion when the oxygen produced by electrolysis is mixed with hydrogen and natural gas. In order to eliminate such risk, in some embodiments, the oxygen exhaust pipe can be connected to a negative pressure source on the ground, and the negative pressure source can directly pump the oxygen produced by electrolysis to the ground to improve the oxygen exhaust efficiency.

[0047] The position of the hydrogen electrode is higher than the perforation layer. Since the density of natural gas and hydrogen is less than that of water, the hydrogen produced by the electrolysis of the hydrogen electrode can be mixed with the natural gas produced in the fracture layer, which not only replenishes the energy of the natural gas, but also decomposes and reduces the accumulated liquid. It improves the foam generation efficiency while reducing the total amount of liquid, thereby comprehensively improving the efficiency of drainage and gas production.

[0048] In addition, during the electrolysis process, the formation fluid usually contains a certain amount of salts, most of whose anion groups are chloride ions. Therefore, a small amount of chlorine is easily produced during electrolysis of the oxygen electrode. Furthermore, the oxygen exhaust pipe is connected to the chlorine separation equipment on the ground, and the small amount of chlorine mixed in the oxygen produced in the oxygen exhaust pipe is separated.

[0049] Among them, the electrolysis voltage and current can be selected according to the characteristics of the bottom hole fluid, the pressure and temperature conditions in the well, so as to achieve precise control of the electrolysis process, avoid excessive gas production and affect the normal drainage process, and the anode and cathode material selection can be selected from the corrosion-resistant and conductive materials commonly used in this field to ensure that long-term operation does not affect the electrolysis efficiency.

[0050] In summary, the present invention combines the physical properties of water seal and gas density, and the designed anode pipeline can ensure that oxygen will not mix with other gases in the wellbore when discharged from the anode. The hydrogen produced at the cathode is used to supplement the production energy and generate foam. On the basis of ensuring the safe separation of the gas, the efficiency of bottom hole drainage is effectively improved. This solution conforms to the natural law of gas flow and can enhance the ability of gas wells to continuously and efficiently produce gas.

[0051] In the description of the present invention, it should be pointed out that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

[0052] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electrolysis-assisted drainage gas production device, characterized in that: The invention comprises a hydrogen electrode (3), a bubbler (5), and an oxygen exhaust pipe (8), wherein the bubbler (5) is detachably arranged inside the oil pipe (1) and above the liquid accumulation layer (10) at the bottom of the well, and the bubbler (5) comprises at least one throttle cover (52) capable of completely dividing the oil pipe (1) into two parts, an upper part and an lower part, and a plurality of groups of throttle holes (53) are vertically arranged on the throttle cover (52) to allow the gas entering the oil pipe (1) to pass through the throttle cover (52) from bottom to top; The hydrogen electrode (3) is detachably arranged in the hydrogen electrode short section (2). The hydrogen electrode short section (2) has the same diameter as the oil pipe (1) and is detachably arranged at the bottom of the oil pipe (1). The hydrogen electrode (3) is immersed in the liquid accumulation layer (10) and is located higher than the perforation layer (11). An oxygen discharge pipe (8) connected to the ground extends vertically into the well and is immersed in the liquid accumulation layer (10), wherein an oxygen electrode short section (7) with an expanded diameter is detachably provided at the bottom of the oxygen discharge pipe (8) and is immersed in the liquid accumulation layer (10), a cylindrical separation sleeve (12) is detachably sleeved at the bottom of the oxygen electrode short section (7), a through hole at the top of the separation sleeve (12) is sleeved on the outer surface of the oxygen electrode short section (7), so that the interior of the oxygen discharge pipe (8) is connected with the interior of the separation sleeve (12), a gas-liquid separator (13) is provided at the bottom of the separation sleeve (12) and only allows liquid to enter the interior of the separation sleeve (12), an oxygen electrode (6) is arranged in the oxygen electrode short section (7) and is immersed in the liquid accumulation layer (10), and a hydrogen electrode (3) and an oxygen electrode (6) can be connected to an external power supply to form an electrolysis circuit, wherein the hydrogen electrode (3) is a cathode and the oxygen electrode (6) is an anode.

2. The electrolysis-assisted drainage and gas production device according to claim 1, characterized in that: A fixing ring (4) is detachably provided inside the hydrogen electrode short section (2), and the fixing ring (4) can completely separate the interior of the hydrogen electrode short section (2) into an upper and lower part, wherein the fixing ring (4) is provided with a plurality of groups of air guide holes (41) connecting the upper and lower parts, and the hydrogen electrode (3) is provided through the center of the fixing ring (4) and is connected to the ground via a cable.

3. The electrolysis-assisted drainage and gas production device according to claim 2, characterized in that: The fixing ring (4) is made of insulating ceramic material and is fixed inside the hydrogen electrode short section (2) by means of threaded connection.

4. The electrolysis-assisted drainage and gas production device according to claim 2, characterized in that: A fixing ring (4) is also detachably arranged inside the oxygen electrode short section (7), and the oxygen electrode (6) is arranged through the center of the fixing ring (4) and is connected to the ground via a cable.

5. The electrolysis-assisted drainage and gas production device according to claim 1, characterized in that: The foamer (5) comprises a separation cylinder (51) and a throttle cover (52), wherein the throttle cover (52) is a dome structure with an arc surface facing upward, which is detachably arranged inside the oil pipe (1) to completely separate the oil pipe (1) into two upper and lower parts, and the dome part is vertically provided with a plurality of groups of throttle holes (53) to connect the upper and lower parts separated by the throttle cover (52); The separation cylinder (51) is detachably coaxially arranged on the inner surface of the oil pipe (1) and connected to the edge of the throttle cover (52). A sand prevention plate (54) is also horizontally arranged inside the separation cylinder (51) to completely separate the separation cylinder (51) into two upper and lower parts. The sand prevention plate (54) is vertically penetrated by a plurality of groups of sand prevention holes (541). Sand prevention covers (543) are arranged one by one below the sand prevention holes (541). The sand prevention covers (543) are vertical tubes with a continuously reduced diameter from top to bottom, and the uppermost end of the sand prevention cover is connected to the sand prevention hole (541) with equal diameter. An atomizing power source (544) and a plurality of atomizing sheets (542) are arranged on the upper surface of the sand prevention plate (54). The atomizing sheets (542) are arranged one by one above the sand prevention holes (541), and the atomizing holes on the atomizing sheets (542) are all connected to the sand prevention holes (541).

6. An electrolysis-assisted drainage gas production method, characterized in that: Using the device as described in any one of claims 1 to 5 to carry out drainage and gas production, comprising the following steps: Step S1: according to the device structure, an oxygen discharge pipe immersed in the bottom liquid layer is arranged in the wellbore, an oxygen electrode immersed in the bottom liquid layer and connected to the ground is arranged inside the oxygen discharge pipe, a bubbler and a hydrogen electrode connected to the ground are arranged in sequence from top to bottom in the oil pipe, wherein the hydrogen electrode is immersed in the liquid layer and located above the perforation layer; Step S2: Power is supplied to the hydrogen electrode and the oxygen electrode to form an electrolysis circuit to electrolyze the liquid accumulation layer, so that the gas generated at the oxygen electrode is discharged from the wellbore along the oxygen exhaust pipe, and the gas generated at the hydrogen electrode enters the oil pipe together with the produced gas and passes through the bubbler to be produced.

7. The electrolysis-assisted drainage gas production method according to claim 6, characterized in that: The oxygen exhaust pipe (6) is connected to a negative pressure source on the ground.

8. The electrolysis-assisted drainage gas production method according to claim 6, characterized in that: The oxygen exhaust pipe (6) is connected to the chlorine separation equipment on the ground.

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