Downhole gas-water two-phase jet flow drainage and mining device and using method

Abstract

The invention relates to the technical field of oil and gas field and coal bed gas exploitation engineering, in particular to an underground gas-water two-phase jet flow drainage and mining device and a using method. According to the technical scheme, more than one group of leather cups are arranged on the outer wall of the lower side of a hydraulic pump body, and the upper end of the hydraulic pump body is connected with the lower end of a pneumatic pump body through an upper connector of the hydraulic pump; an air distributing and collecting umbrella pipe is installed on the outer side of the pneumatic pump body, a pneumatic throat pipe, a liquid drop micronizer and a pneumatic nozzle are arranged in the pneumatic pump body, a pneumatic diffusion cavity is formed in the upper portion of the pneumatic throat pipe, the pneumatic nozzle is arranged on the lower portion of the pneumatic throat pipe, the liquid drop micronizer is arranged on the upper side of the pneumatic throat pipe, and the lower end of the pneumatic nozzle is connected with an air inlet. The upper end of the pneumatic nozzle is communicated with the mixed liquid channel. The hydraulic pump has the advantages that the hydraulic pump body and the pneumatic pump body are designed to be integrated into an organic whole, the structure is compact and novel, high-pressure water jet speed-increasing atomized liquid flow and high-pressure gas jet flow are integrated to achieve jet flow drainage and mining, the lifting lift is greatly improved, and the negative-pressure suction and plug removal effects are also achieved on other blockages in a production layer.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas fields and coalbed methane mining engineering, and in particular to an underground gas-water two-phase jet drainage device and a use method thereof. Background Art

[0002] During the exploitation of medium-deep natural gas wells, deep shale gas wells and coalbed methane wells, as the formation pressure gradually decreases, water accumulation at the bottom of the well intensifies, resulting in water blockage, low production and even shutdown of the gas well. Existing drainage processes and devices such as bubble drainage, plunger drainage, gas lift, mechanical pumping and hydraulic pumping all have good initial effects. However, as the formation pressure continues to drop and the output gas-water ratio decreases, they are restricted by the lifting head and the large difference in gas-water density, which makes separation and slippage very easy. As a result, they show low efficiency, long time, high cost and even no effect. Some gas wells will also experience the phenomenon of construction fluid backflowing into the production layer, especially in wells with low gas production and large water production. It is more prominent and more difficult to meet the needs of low liquid level, deep wells and ultra-deep wells.

[0003] Therefore, it is necessary to invent a new, more efficient and practical drainage and gas production device with a lifting head greater than 3500 meters. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned defects of the prior art and provide an underground gas-water two-phase jet production device and a method of use. By designing the hydraulic pump body and the pneumatic pump body into an organic whole, the structure is compact and novel. The high-pressure water jet speed-increasing atomized liquid flow is integrated with the high-pressure gas jet to achieve jet production, which greatly improves the lifting head and also has a negative pressure suction and unblocking effect on other blockages in the production layer.

[0005] The present invention mentions an underground gas-water two-phase jet production device, and its technical solution is: including a hydraulic pump body, a diffuser, a hydraulic throat, a hydraulic nozzle, a power water inlet, and a formation fluid channel. The hydraulic pump body is provided with a diffuser, a hydraulic throat and a hydraulic nozzle, the upper end of the hydraulic throat is provided with a diffuser, the lower end of the hydraulic throat is provided with a hydraulic nozzle, the lower end of the hydraulic nozzle is connected to the power water inlet, and the upper end of the hydraulic nozzle is connected to the formation fluid channel, wherein, it also includes a pneumatic pump body, an air distribution and air collection umbrella tube, a pneumatic throat, a droplet micronizer, a pneumatic nozzle, an air inlet, a mixing A liquid combining channel, a leather cup, and an upper joint of a hydraulic pump. The lower outer wall of the hydraulic pump body is provided with more than one group of leather cups. The upper end of the hydraulic pump body is connected to the lower end of the pneumatic pump body through the upper joint of the hydraulic pump. An air separation and air collecting umbrella tube is installed on the outer side of the pneumatic pump body. A pneumatic throat, a droplet micronizer and a pneumatic nozzle are provided inside the pneumatic pump body. A pneumatic diffusion chamber is provided at the upper part of the pneumatic throat, and a pneumatic nozzle is provided at the lower part of the pneumatic throat. A droplet micronizer is installed on the upper side of the pneumatic nozzle. The lower end of the pneumatic nozzle is connected to the air inlet, and the upper end of the pneumatic nozzle is connected to the mixed liquid channel.

[0006] Preferably, the above-mentioned gas-distributing and gas-collecting umbrella pipe includes an umbrella pipe connector, a separation cover, annular blades, air flow holes, internal threads, and an umbrella pipe lower joint. The lower part of the umbrella pipe connector forms an integral body with the separation cover. Internal threads are provided on the inner wall of the umbrella pipe connector for connecting and fixing to the pneumatic pump body. The separation cover is of a cylindrical structure. Multiple groups of air flow holes are provided on the outer wall of the separation cover. Annular blades are fixed above each group of air flow holes for collecting gas and enabling the gas to enter the interior of the separation cover along the air flow holes. The lower part of the separation cover is provided with an umbrella pipe lower joint.

[0007] Preferably, the above-mentioned annular blades are fixed obliquely downward along the outer wall of the separation cover. The inner diameter of the separation cover is larger than the outer diameter of the pneumatic pump body, and an annular cavity is formed between the separation cover and the pneumatic pump body.

[0008] Preferably, the above-mentioned droplet atomizer includes a skeleton support column, atomizing ring plates, jet ring slots, mounting holes, and fixing rings. Multiple groups of atomizing ring plates are penetrated through the skeleton support column, and jet ring slots are formed between adjacent atomizing ring plates. Fixing rings are fixed at both ends of the skeleton support column, and mounting holes are formed at the centers of the fixing rings and the atomizing ring plates for mounting on the outer side of the outlet end of the pneumatic nozzle.

[0009] Preferably, the above-mentioned atomizing ring plates are circular rings with a thick center and gradually thinning outer edges, and the above-mentioned skeleton support column is composed of four groups.

[0010] Preferably, the above-mentioned upper joint of the hydraulic pump is connected to the lower end of the pneumatic pump body by threads, and the outer diameter of the upper joint of the hydraulic pump is smaller than the inner diameter of the separation cover.

[0011] Preferably, a protruding fixing seat is provided at the lower part of the above-mentioned hydraulic pump body, and a guiding inclined surface is provided at the lower end of the protruding fixing seat. Multiple groups of leather cups are distributed on the protruding fixing seat.

[0012] Preferably, reinforcing ribs are provided in the inner cavity of the above-mentioned leather cup, and the leather cup is of an obliquely upward structure.

[0013] The usage method of the downhole gas-water two-phase jet drainage device mentioned in the present invention has a technical solution including the following processes: 1. Inject high-pressure water and high-pressure gas into the annulus between the tubing and the casing from the ground. The high-pressure water and high-pressure gas injected into the well undergo gas-water gravity separation at the gas-distributing and gas-collecting umbrella pipe. The separated high-pressure gas ascends and enters the air inlet of the pneumatic pump body along multiple annular blades and air flow holes on the gas-distributing and gas-collecting umbrella pipe. The high-pressure gas continues to spray upward along the pneumatic nozzle, thereby ejecting the mixed liquid pumped by the hydraulic pump body. 2. The high-pressure water separated by gas-water gravity then enters the power water inlet of the lower hydraulic pump body downward, and then sprays out along the hydraulic nozzle, thereby ejecting and sucking the accumulated water from the well in the formation liquid channel. The formed gas-containing mixed liquid ascends along the diffusion pipe and enters the mixed liquid channel of the upper pneumatic pump body. III. The gas-containing mixed liquid enters the droplet atomizer in the pneumatic pump body. After passing through the jet annulus gap between the atomizing ring plates, it is sheared, mixed, and finely atomized with the high-pressure air flow ejected from the pneumatic nozzle. The mist-like gas-water mixture enters the pneumatic throat pipe for deep mixing, energy conversion, and atomization, forming a micro-droplet gas suspension fluid with gas as the continuous phase and water as the dispersed phase. Part of the water film adhering to the wall is also dispersed and carried upward by the high-speed air flow, and reaches the ground along the oil pipe under the push of the high-pressure gas. During the upward process, as the pressure decreases, the gas expansion effect causes the mixed fluid to flow at high speed towards the ground; IV. After the mixed fluid reaches the ground, it is separated from gas and water and recycled through a gas-liquid separator; after separation, part of the gas is output to the gas collection system, and the other part of the gas is transported to the gas compressor and used as the driving power medium for the pneumatic pump body of this well. In addition, the separated water is sent into the water tank and recycled through the water pump, thus realizing continuous gas production by drainage.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: I. The present invention uses high-pressure gas and water as the driving power media for sucking the pneumatic pump body and the hydraulic pump body, and adopts a gas-water two-phase integrated jet to lift the accumulated water at the bottom of the well to the ground in the form of a gas suspension mist flow. Its process principle is unique, advanced, practical, simple to operate, environmentally friendly, and safe. After mixing the high-pressure gas and high-pressure water transmitted from the surface equipment to the bottom of the well, gas-water gravity separation is carried out through a gas distribution and collection umbrella pipe. The separated high-pressure gas ascends and enters the pneumatic pump body through multiple annular blades and air flow holes on the gas distribution and collection umbrella pipe. The high-pressure gas continues to eject upward along the pneumatic nozzle, thereby ejecting the mixed liquid pumped by the hydraulic pump body. Then, the water is lifted out of the ground by using the gas expansion energy, which greatly increases the lifting head, and also has a negative pressure suction and plugging removal effect on other blockages in the production layer, and is more suitable for gas production by drainage in deep gas wells and low-pressure gas wells; II. The gas-water two-phase jet drainage and production device of the present invention integrates the gas-water two-phase power media to drive the two-stage integrated relay jet into an organic whole, with a compact and novel structure. It combines the high-pressure water jet to increase the speed and atomize the liquid flow with the high-pressure gas jet to achieve jet drainage and production, effectively increasing the upward kinetic energy of the gas-liquid mixture. Its gas-liquid mixing and atomization effect is good, the drainage and production head is high, the efficiency is high, the energy consumption is low, the structure is novel, and the operation is simple and reliable. By optimizing and adjusting the ratio, pressure, and flow parameters of the injected water and gas, it can meet the drainage and production requirements of gas wells with different gas-water ratios. This device has a wide range of applications, is simple to operate, and does not require adding too many construction equipment and additional construction media. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the gas distribution and collection umbrella pipe; Figure 3It is a schematic structural diagram of a droplet atomizer; Figure 4 It is a schematic diagram of the droplet atomizer in a top view direction; Figure 5 It is a schematic diagram of the application principle of the present invention; Figure 6 It is a schematic structural diagram of the second embodiment of the pneumatic pump body part; Figure 7 It is a schematic structural diagram of the second embodiment of the droplet atomizer; Figure 8 It is a schematic structural diagram of the second embodiment of the droplet atomizer in a top view direction; In the figure: pneumatic pump body 1, air distribution and gas collecting umbrella pipe 2, pneumatic throat pipe 3, droplet atomizer 4, pneumatic nozzle 5, air inlet 6, mixed liquid channel 7, hydraulic pump body 8, diffuser pipe 9, hydraulic throat pipe 10, hydraulic nozzle 11, power water inlet 12, formation liquid channel 13, leather cup 14, upper joint of hydraulic pump 15, casing 16, tubing 17, downhole gas-water two-phase jet drainage and production device 18, check valve 19, gas compressor 20, wellhead device 21, water pump 22, water tank 23, gas-liquid separator 24, gas collecting system 25; Umbrella pipe connector 2.1, separation cover 2.2, annular blade 2.3, air flow hole 2.4, internal thread 2.5, lower joint of umbrella pipe 2.6, skeleton support column 4.1, atomization ring piece 4.2, jet ring gap 4.3, mounting hole 4.4, fixing ring 4.5, protruding fixing seat 8.1, guiding inclined surface 8.2. Specific embodiments

[0016] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0017] Example 1, refer to Figures 1 - 5, a downhole gas-liquid two-phase jet drainage device mentioned in the present invention includes a hydraulic pump body 8, a diffuser tube 9, a hydraulic throat tube 10, a hydraulic nozzle 11, a motive water inlet 12, and a formation fluid passage 13. The hydraulic pump body 8 is provided with a diffuser tube 9, a hydraulic throat tube 10, and a hydraulic nozzle 11. The diffuser tube 9 is provided at the upper end of the hydraulic throat tube 10, and the hydraulic nozzle 11 is provided below the hydraulic throat tube 10. The lower end of the hydraulic nozzle 11 is connected to the motive water inlet 12, and the upper end of the hydraulic nozzle 11 communicates with the formation fluid passage 13. Among them, it further includes a pneumatic pump body 1, a gas distribution and collection umbrella tube 2, a pneumatic throat tube 3, a droplet atomizer 4, a pneumatic nozzle 5, an air inlet 6, a mixed liquid passage 7, a leather cup 14, and a hydraulic pump upper joint 15. A group or more of leather cups 14 are provided on the outer wall of the lower side of the hydraulic pump body 8, and the upper end of the hydraulic pump body 8 is connected to the lower end of the pneumatic pump body 1 through the hydraulic pump upper joint 15; the gas distribution and collection umbrella tube 2 is installed on the outside of the pneumatic pump body 1. The pneumatic pump body 1 is internally provided with a pneumatic throat tube 3, a droplet atomizer 4, and a pneumatic nozzle 5. A pneumatic diffusion cavity is provided in the upper part of the pneumatic throat tube 3, and a pneumatic nozzle 5 is provided in the lower part of the pneumatic throat tube 3. The droplet atomizer 4 is installed on the upper side of the pneumatic nozzle 5, the lower end of the pneumatic nozzle 5 is connected to the air inlet 6, and the upper end of the pneumatic nozzle 5 communicates with the mixed liquid passage 7.

[0018] Refer to Figure 2 , the gas distribution and collection umbrella tube 2 mentioned in the present invention includes an umbrella tube connector 2.1, a separation cover 2.2, a ring vane 2.3, an air flow hole 2.4, an internal thread 2.5, and an umbrella tube lower joint 2.6. The lower part of the umbrella tube connector 2.1 forms an integral body with the separation cover 2.2. An internal thread 2.5 is provided on the inner wall of the umbrella tube connector 2.1 for connecting and fixing with the pneumatic pump body 1; the separation cover 2.2 is of a cylindrical structure. A plurality of groups of air flow holes 2.4 are provided on the outer wall of the separation cover 2.2, and a ring vane 2.3 is fixed on the upper side of each group of air flow holes 2.4 for collecting gas and enabling the gas to enter the inside of the separation cover 2.2 along the air flow holes 2.4. The lower part of the separation cover 2.2 is provided with an umbrella tube lower joint 2.6.

[0019] Among them, the above-mentioned ring vane 2.3 is fixed obliquely downward along the outer wall of the separation cover 2.2. The inner diameter of the separation cover 2.2 is larger than the outer diameter of the pneumatic pump body 1, and an annular cavity is formed between the separation cover 2.2 and the pneumatic pump body 1.

[0020] Refer to Figures 3 - 4, the droplet atomizer 4 mentioned in the present invention includes a skeleton support column 4.1, an atomizing ring plate 4.2, a jet ring gap 4.3, a mounting hole 4.4 and a fixing ring 4.5. A plurality of groups of atomizing ring plates 4.2 are penetrated on the skeleton support column 4.1, and a jet ring gap 4.3 is formed between adjacent atomizing ring plates 4.2. Fixing rings 4.5 are fixed at both ends of the skeleton support column 4.1, and the center of the fixing ring 4.5 and the center of the atomizing ring plate 4.2 form a mounting hole 4.4 for mounting on the outer side of the outlet end of the pneumatic nozzle 5.

[0021] Among them, the above-mentioned atomizing ring plate 4.2 adopts a circular ring with a thick center and gradually thinning outer edge, and the above-mentioned skeleton support column 4.1 adopts four groups.

[0022] The above-mentioned upper joint 15 of the hydraulic pump is connected to the lower end of the pneumatic pump body 1 by thread, and the outer diameter of the upper joint 15 of the hydraulic pump is smaller than the inner diameter of the separation cover 2.2.

[0023] The lower part of the above-mentioned hydraulic pump body 8 is provided with a protruding fixed seat 8.1, and a guiding inclined surface 8.2 is provided at the lower end of the protruding fixed seat 8.1. A plurality of groups of leather cups 14 are distributed on the protruding fixed seat 8.1.

[0024] The inner cavity of the above-mentioned leather cup 14 is provided with reinforcing ribs, and the leather cup is of an obliquely upward structure.

[0025] The usage method of the downhole gas-water two-phase jet drainage device mentioned in the present invention, its technical solution includes the following processes: One, referring to Figure 5 , at the ground wellhead, the downhole gas-water two-phase jet drainage device 18 is sent into the well through the oil pipe 17. A check valve 19 is provided at the lower end of the downhole gas-water two-phase jet drainage device 18. On one side of the wellhead device 21 on the ground, there are a gas compressor 20, a water pump 22, a water tank 23, a gas-liquid separator 24, and a gas collection system 25. The output end of the gas compressor 20 is connected to the wellhead device 21, the input end of the gas compressor 20 is connected to the gas separation outlet of the gas-liquid separator 24, the liquid separation outlet of the gas-liquid separator 24 is connected to the water tank 23, the lower side of the water tank 23 is connected to the water pump 22, and the output end of the water pump 22 is connected to the wellhead device 21; Two, inject high-pressure water and high-pressure gas into the annulus between the oil pipe 17 and the casing 16 from the ground. The high-pressure water and high-pressure gas injected into the well are subjected to gas-water gravity separation at the gas distribution and collection umbrella pipe 2. The separated high-pressure gas ascends and enters the air inlet 6 of the pneumatic pump body 1 along the multiple annular blades 2.3 and air flow holes 2.4 on the gas distribution and collection umbrella pipe 2. The high-pressure gas continues to spray upward along the pneumatic nozzle 5, thereby ejecting the mixed liquid pumped by the hydraulic pump body 8; 3. The high-pressure water separated by gas-water gravity separation then enters the power water inlet 12 of the lower hydraulic pump body 8 downward, and is ejected along the hydraulic nozzle 11, thereby ejecting and sucking the accumulated water from the well in the formation fluid channel 13. The gas-containing mixed liquid formed flows upward along the diffuser pipe 9 into the mixed liquid channel 7 of the upper pneumatic pump body 1; 4. The gas-containing mixed liquid enters the droplet atomizer 4 in the pneumatic pump body 1. After passing through the jet ring gap 4.3 between the atomizing ring pieces 4.2, it is sheared, mixed, and finely atomized with the high-pressure gas ejected from the pneumatic nozzle 5. The misty gas-water mixed liquid enters the pneumatic throat pipe 3 for deep mixing, energy conversion, and atomization, forming a micro-droplet gas suspension fluid with gas as the continuous phase and water as the dispersed phase. Part of the water film hanging on the wall is also washed away and carried upward by the high-speed gas flow, and reaches the ground along the oil pipe 17 under the push of the high-pressure gas. During the upward process, as the pressure decreases, the gas expansion effect causes the mixed fluid to flow to the ground at high speed; 5. After the mixed fluid reaches the ground, it is separated from gas and water and recycled through the gas-liquid separator 24; after separation, part of the gas is output to the gas collection system 25, and another part of the gas is transported to the gas compressor 20 and used as the driving power medium for the pneumatic pump body 1 of this well; in addition, the separated water is sent into the water tank 23 and recycled through the water pump 22, thereby realizing continuous drainage and gas production.

[0026] Embodiment 2. A downhole gas-water two-phase jet drainage and production device mentioned in the present invention includes a hydraulic pump body 8, a diffuser pipe 9, a hydraulic throat pipe 10, a hydraulic nozzle 11, a power water inlet 12, and a formation fluid channel 13. The hydraulic pump body 8 is provided with a diffuser pipe 9, a hydraulic throat pipe 10, and a hydraulic nozzle 11. The upper end of the hydraulic throat pipe 10 is provided with a diffuser pipe 9, the lower side of the hydraulic throat pipe 10 is provided with a hydraulic nozzle 11, the lower end of the hydraulic nozzle 11 is connected to the power water inlet 12, and the upper end of the hydraulic nozzle 11 is communicated with the formation fluid channel 13. Among them, it further includes a pneumatic pump body 1, a gas distribution and collection umbrella pipe 2, a pneumatic throat pipe 3, a droplet atomizer 4, a pneumatic nozzle 5, an air inlet 6, a mixed liquid channel 7, a leather cup 14, and a hydraulic pump upper joint 15. One or more groups of leather cups 14 are provided on the outer wall of the lower side of the hydraulic pump body 8, and the upper end of the hydraulic pump body 8 is connected to the lower end of the pneumatic pump body 1 through the hydraulic pump upper joint 15; the gas distribution and collection umbrella pipe 2 is installed outside the pneumatic pump body 1, and the pneumatic throat pipe 3, the droplet atomizer 4, and the pneumatic nozzle 5 are provided inside the pneumatic pump body 1. A pneumatic diffusion cavity is provided above the pneumatic throat pipe 3, a pneumatic nozzle 5 is provided below the pneumatic throat pipe 3, the droplet atomizer 4 is installed on the upper side of the pneumatic nozzle 5, the lower end of the pneumatic nozzle 5 is connected to the air inlet 6, and the upper end of the pneumatic nozzle 5 is communicated with the mixed liquid channel 7.

[0027] The difference from Embodiment 1 is: Refer to Figures 6 - 8, the droplet atomizer 4 mentioned in this embodiment is installed outside the pneumatic nozzle 5, and the droplet atomizer 4 includes a skeleton support column 4.1, an atomizing ring plate 4.2, a jet ring gap 4.3, and a mounting hole 4.4. A plurality of groups of atomizing ring plates 4.2 are penetrated on the skeleton support column 4.1. The plurality of groups of atomizing ring plates 4.2 are in an inclined stacked sheet shape, and a jet ring gap 4.3 is formed between adjacent atomizing ring plates 4.2. A mounting hole 4.4 is formed at the center of the atomizing ring plate 4.2 for sleeving outside the pneumatic nozzle 5. Among them, the inner diameter of the mounting hole 4.4 at the center of the atomizing ring plate 4.2 increases from bottom to top, so that the mounting hole 4.4 forms a frustum-shaped cavity. In addition, the atomizing ring plate 4.2 gradually becomes smaller from bottom to top, and the atomizing ring plate 4.2 is a smooth annular structure, and the formed jet ring gap 4.3 is an equidiameter gap; In addition, eight skeleton support columns 4.1 are adopted, four are arranged in the inner circle and four are arranged in the outer circle, and they are all inclined. This structure can also achieve the function of droplet atomization.

[0028] In this embodiment, the plurality of groups of atomizing ring plates 4.2 adopted are in an inclined stacked sheet shape. The formation water separated by the atomizing ring plates 4.2 is sheared and atomized under the entrainment suction action of the high-pressure gas, and then is entrained into the pneumatic throat 3. Then, it is sheared, mixed, and finely atomized with the high-pressure gas jet ejected from the pneumatic nozzle 5. The misty gas-liquid mixture enters the pneumatic throat 3 for deep mixing, energy conversion, and atomization, forming a micro-droplet gas suspension fluid with gas as the continuous phase and water as the dispersed phase. Part of the water film hanging on the wall is also washed away and lifted by the high-speed gas flow, and reaches the ground along the oil pipe 17 under the push of the high-pressure gas. During the upward process, as the pressure decreases, the gas expansion effect makes the mixed fluid flow to the ground at a high speed; As mentioned above, only some preferred embodiments of the present invention are described. Any person skilled in the art may modify the above-described technical solution or modify it into an equivalent technical solution. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solution of the present invention all fall within the scope of protection required by the present invention.

Claims

1. An underground gas-water two-phase jet drainage device, comprising a hydraulic pump body (8), a diffuser tube (9), a hydraulic throat tube (10), a hydraulic nozzle (11), a motive water inlet (12), and a formation fluid channel (13). The diffuser tube (9), the hydraulic throat tube (10), and the hydraulic nozzle (11) are arranged inside the hydraulic pump body (8). The diffuser tube (9) is provided at the upper end of the hydraulic throat tube (10), and the hydraulic nozzle (11) is provided below the hydraulic throat tube (10). The lower end of the hydraulic nozzle (11) is connected to the motive water inlet (12), and the upper end of the hydraulic nozzle (11) communicates with the formation fluid channel (13). It is characterized in that: It also includes a pneumatic pump body (1), an air distribution and gas collection umbrella tube (2), a pneumatic throat tube (3), a droplet atomizer (4), a pneumatic nozzle (5), an air inlet (6), a mixed liquid channel (7), a leather cup (14), and a hydraulic pump upper joint (15). One or more leather cups (14) are provided on the lower outer wall of the hydraulic pump body (8). The upper end of the hydraulic pump body (8) is connected to the lower end of the pneumatic pump body (1) through the hydraulic pump upper joint (15). The air distribution and gas collection umbrella tube (2) is installed outside the pneumatic pump body (1). The pneumatic throat tube (3), the droplet atomizer (4), and the pneumatic nozzle (5) are provided inside the pneumatic pump body (1). An air diffusion chamber is provided in the upper part of the pneumatic throat tube (3), and a pneumatic nozzle (5) is provided in the lower part of the pneumatic throat tube (3). The droplet atomizer (4) is installed on the upper side of the pneumatic nozzle (5). The lower end of the pneumatic nozzle (5) is connected to the air inlet (6), and the upper end of the pneumatic nozzle (5) communicates with the mixed liquid channel (7).

2. The downhole gas-water two-phase jet drainage device according to claim 1, wherein: The air distribution and gas collection umbrella tube (2) includes an umbrella tube connector (2.1), a separation cover (2.2), an annular blade (2.3), an air flow hole (2.4), an internal thread (2.5), and an umbrella tube lower joint (2.6). The lower part of the umbrella tube connector (2.1) forms an integral body with the separation cover (2.2). An internal thread (2.5) is provided on the inner wall of the umbrella tube connector (2.1) for connecting and fixing with the pneumatic pump body (1). The separation cover (2.2) is of a cylindrical structure. A plurality of groups of air flow holes (2.4) are provided on the outer wall of the separation cover (2.2). An annular blade (2.3) is fixed on the upper side of each group of air flow holes (2.4) for collecting gas and enabling the gas to enter the inside of the separation cover (2.2) along the air flow holes (2.4). The lower part of the separation cover (2.2) is provided with an umbrella tube lower joint (2.6).

3. The downhole gas-water two-phase jet drainage device according to claim 2, wherein: The annular blade (2.3) is fixed obliquely downward along the outer wall of the separation cover (2.2). The inner diameter of the separation cover (2.2) is larger than the outer diameter of the pneumatic pump body (1), and an annular cavity is formed between the separation cover (2.2) and the pneumatic pump body (1).

4. The downhole gas-water two-phase jet drainage device according to claim 3, characterized in that: The droplet atomizer (4) includes a skeleton support column (4.1), an atomizing ring plate (4.2), a jet ring slot (4.3), a mounting hole (4.4), and a fixing ring (4.5). A plurality of groups of atomizing ring plates (4.2) are penetrated through the skeleton support column (4.1), and a jet ring slot (4.3) is formed between adjacent atomizing ring plates (4.2). Fixing rings (4.5) are fixed at both ends of the skeleton support column (4.1), and the center of the fixing ring (4.5) and the center of the atomizing ring plate (4.2) form a mounting hole (4.4) for mounting on the outer side of the outlet end of the pneumatic nozzle (5).

5. The downhole gas-water two-phase jet drainage device according to claim 4, characterized in that: The atomizing ring plate (4.2) is a circular ring with a thick center and gradually thinning outer edge. The skeleton support column (4.1) is composed of four groups.

6. The downhole gas-water two-phase jet drainage device according to claim 5, characterized in that: The hydraulic pump upper joint (15) is connected to the lower end of the pneumatic pump body (1) by thread, and the outer diameter of the hydraulic pump upper joint (15) is smaller than the inner diameter of the separation cover (2.2).

7. The downhole gas-water two-phase jet drainage device according to claim 6, characterized in that: The lower part of the hydraulic pump body (8) is provided with a protruding fixing seat (8.1), and the lower end of the protruding fixing seat (8.1) is provided with a guiding inclined surface (8.2). A plurality of leather cups (14) are distributed on the protruding fixing seat (8.1).

8. The downhole gas-water two-phase jet drainage device according to claim 7, characterized in that: The inner cavity of the leather cup (14) is provided with reinforcing ribs, and the leather cup is of an inclined upward structure.

9. The method of using the downhole gas-water two-phase jet drainage device according to claim 8, characterized in that: It includes the following processes: First, high-pressure water and high-pressure gas are injected into the annulus between the tubing (17) and the casing (16) from the ground. The high-pressure water and high-pressure gas injected into the well undergo gas-water gravity separation at the gas-liquid separation umbrella pipe (2). The separated high-pressure gas ascends and enters the air inlet (6) of the pneumatic pump body (1) along a plurality of annular vanes (2.3) and air flow holes (2.4) on the gas-liquid separation umbrella pipe (2). The high-pressure gas continues to spray upward along the pneumatic nozzle (5), thereby ejecting the mixed liquid pumped by the hydraulic pump body (8). Second, the high-pressure water separated by gas-water gravity enters the power water inlet (12) of the lower hydraulic pump body (8), and then sprays out along the hydraulic nozzle (11), thereby ejecting the accumulated water from the well in the formation liquid suction channel (13). The formed gas-containing mixed liquid ascends along the diffuser pipe (9) and enters the mixed liquid channel (7) of the upper pneumatic pump body (1). Third, the gas-containing mixed liquid enters the liquid droplet atomizer (4) in the pneumatic pump body (1). After passing through the jet ring gap (4.3) between the atomizing ring pieces (4.2), it is sheared, mixed, and finely atomized with the high-pressure air flow ejected from the pneumatic nozzle (5). The mist-like gas-water mixed liquid enters the pneumatic throat (3) for deep mixing, energy conversion, and atomization, forming a micro-droplet gas suspension fluid with gas as the continuous phase and water as the dispersed phase. Part of the water film adhering to the wall is also washed away and ascends by the high-speed air flow, and reaches the ground along the tubing (17) under the push of the high-pressure gas. During the ascending process, as the pressure decreases, the gas expansion effect causes the mixed fluid to flow at high speed to the ground. Fourth, after the mixed fluid reaches the ground, it is subjected to gas-water separation and recycling through the gas-liquid separator (24); after separation, a part of the gas is output to the gas collection system (25), and another part of the gas is transported to the gas compressor (20) and used as the driving power medium for the pneumatic pump body (). In addition, the separated water is sent into the water tank (23), and then recycled through the water pump (22), thereby realizing continuous drainage and gas production.

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