A downhole jetting displacement pump suitable for gas-liquid two-phase driving and a use method thereof

Abstract

The present application relates to the technical fields of downhole jet flow drainage pump, and particularly relates to a downhole jet flow drainage pump suitable for gas-liquid two-phase driving and a use method. The upper end of a pump barrel assembly is provided with an upper joint, the lower end of the upper joint is provided with a pump core support seat, and the pump core support seat is provided with an upper pump core installation channel; a central cavity is arranged in the middle part of the pump barrel assembly, a lower pump core installation channel, a formation liquid inlet channel and a mixed liquid outlet are arranged in the lower part of the pump barrel assembly, and the mixed liquid outlet is communicated with the lower pump core installation channel; a gas-driven jet flow pump core is installed in the upper pump core installation channel, the central cavity and the lower pump core installation channel. The beneficial effects are that the present application does not need to use a production pipe column, and the switching between liquid driving and gas driving can be realized by putting a liquid-driven jet flow pump core or a gas-driven jet flow pump core, so that the needs of early high-speed liquid drainage and later low-speed gas drainage production are flexibly met, and the downhole jet flow drainage system is in a better low-energy-consumption operation state.

Description

Technical Field

[0001] This invention relates to the field of downhole jet drainage pump technology, and particularly to a downhole jet drainage pump suitable for gas-liquid two-phase drive and its usage method. Background Technology

[0002] Currently, downhole jet pumps used in oil and gas wells, coalbed methane wells, and in-situ leaching oil wells are generally suitable for a single phase of driving medium, either water or gas. However, as the gas-liquid ratio, pressure, and production parameters of the downhole products change, the initial driving medium and method become unsuitable and uneconomical. This necessitates retrieving the well tubing to replace the new downhole jet pump and its associated downhole tools when the driving medium needs to be changed. This is not only time-consuming but also increases production costs. This is especially true for natural gas wells, shale gas wells, and coalbed methane wells. During the drainage phase, the well produces a large amount of water but produces relatively little gas, requiring water as the driving fluid to discharge large volumes of water accumulated in the formation. After a period of production, the formation pressure decreases, the water production decreases, and the water-to-gas ratio also decreases. If water-driven jet drainage is still used, energy consumption increases and economic efficiency decreases. If produced gas is used as the driving medium, energy consumption is lower, and surface treatment costs are also lower, making it more suitable for drainage in the mid-to-late stages of low pressure and low production. For coalbed methane wells, in the early production stage, water production is relatively high and gas production is relatively low, i.e., the water-to-gas ratio is high. At this time, the gas's water-carrying capacity is weak, and water-driven jets are efficient, convenient, and effective in removing sand and coal dust. In the later stages of extraction, the production of water, pulverized coal, and sand is lower, the water-to-gas ratio of the gas well is even lower, and the gas's ability to carry water becomes stronger, making gas-driven extraction more economical and feasible. However, for offshore oil and gas wells, and oil and gas wells whose products contain hazardous gases such as hydrogen sulfide, replacing the tubing string is risky and costly.

[0003] Our company applied for Chinese patent number 2025109134688 on July 3, 2025, entitled "Downhole Gas-Water Two-Phase Jet Drainage Device and Usage Method". The technical solution is as follows: the lower outer wall of the hydraulic pump body is provided with one or more rubber cups, and the upper end of the hydraulic pump body is connected to the lower end of the pneumatic pump body through the hydraulic pump upper connector; the outer side of the pneumatic pump body is equipped with a gas distribution and gas collection umbrella pipe, and the inside of the pneumatic pump body is provided with a pneumatic throat, a droplet micronizer and a pneumatic nozzle. A pneumatic diffusion chamber is provided in the upper part of the pneumatic throat, and a pneumatic nozzle is provided in the lower part of the pneumatic throat. A droplet micronizer is provided on the upper side, 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. The aforementioned invention integrates a hydraulic pump body and a pneumatic pump body into a compact and novel structure. It combines high-pressure water jet to accelerate atomized liquid flow with high-pressure gas jet to achieve jet drainage, significantly increasing the lifting head. It also provides negative pressure suction to remove blockages within the production layer. Its drawback is that it does not employ a pump core suitable for two-phase gas-liquid drive, thus preventing flexible switching between hydraulic and pneumatic drives. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a downhole jet pump and its usage method suitable for gas-liquid two-phase drive. This eliminates the need for downhole pump casing and production tubing, allowing for switching between liquid-driven and gas-driven operation simply by deploying a liquid-driven or gas-driven jet pump core. This flexibly meets the needs of high-speed liquid drainage production and low-speed gas drainage production, enabling the downhole jet pump system to operate in an optimal low-energy consumption state.

[0005] The present invention discloses a downhole jet pump suitable for gas-liquid two-phase drive, the technical solution of which includes a pump barrel assembly, comprising an upper connector, a formation fluid inlet channel, a mixed fluid outlet, a liquid-driven jet pump core, a gas-driven jet pump core, an upper pump core mounting channel, a central cavity, a pump core support, and a lower pump core mounting channel. The upper connector is located at the upper end of the pump barrel assembly, and the pump core support is located at the lower end of the upper connector. The pump core support contains the upper pump core mounting channel. A central cavity is located in the middle of the pump barrel assembly, and a lower pump core mounting channel is located at the lower part of the pump barrel assembly. The system includes an upper pump core installation channel, a formation fluid inlet pump channel, and a mixed liquid outlet, with the mixed liquid outlet connected to the lower pump core installation channel. When drainage is required, the liquid-driven jet pump core is installed in the upper pump core installation channel, the central cavity, and the lower pump core installation channel, and sits on the pump core support seat. Power fluid is injected for positive circulation hydraulic jet drainage production. When venting is required, the gas-driven jet pump core is installed in the upper pump core installation channel, the central cavity, and the lower pump core installation channel, and sits on the pump core support seat. Power gas is injected for positive circulation pneumatic jet drainage production. The pneumatic jet pump core includes a pneumatic pump core assembly, a pneumatic center rod, a pneumatic nozzle, a second formation fluid intake port, a pneumatic atomizing throat, a pneumatic diffuser, a second flow-converting hole, a second retrieval head, a second pump core fixing protrusion, a power gas channel, and a power gas inlet. A second retrieval head is installed on the top of the pneumatic pump core assembly. A power gas inlet is located on the lower side of the second retrieval head, and a second pump core fixing protrusion is located on the lower side of the power gas inlet. A power gas channel is provided within the inner cavity of the pneumatic pump core assembly, and the lower end of the power gas channel is connected to the pneumatic nozzle. A pneumatic center rod is installed at the center of the pneumatic nozzle, and the pneumatic center rod extends towards the center of the lower pneumatic atomizing throat. A pneumatic diffuser is located below the pneumatic atomizing throat, and a second flow-converting hole is located on the lower outer wall of the pneumatic diffuser. The second flow-converting hole communicates with the mixed liquid outlet. A second formation fluid intake port is located on one side of the pneumatic nozzle on the pneumatic pump core assembly.

[0006] Preferably, an atomizer is installed on the outside of the pneumatic nozzle and below the second formation fluid intake hole. The atomizer has an annular body and evenly distributed inwardly inclined atomizing holes.

[0007] Preferably, the pneumatic center rod includes a fixed tail end and a center rod body. The lower end of the fixed tail end is connected to the center rod body, and the center rod body is located at the center of the pneumatic nozzle. The fixed tail end has a cylindrical structure with an outer diameter smaller than the inner diameter of the power gas channel. Gas passage holes are evenly distributed on the fixed tail end. The power gas flows downward along the gas passage holes and then passes through the annular space formed by the center rod body and the inner cavity of the pneumatic nozzle to spray downward to form a negative pressure area.

[0008] Preferably, a second pump cup is installed on the upper side of the pneumatic pump core assembly and is located above the second pump core fixing protrusion; the bottom end of the pneumatic pump core assembly is a cap structure, and multiple second flow holes are distributed on the lower side wall of the pneumatic pump core assembly, and second sealing rings are installed on the lower side wall and the upper side wall of the pneumatic pump core assembly respectively.

[0009] Preferably, the aforementioned liquid-driven jet pump core includes a liquid-driven pump core assembly, a liquid-driven nozzle, a first formation fluid intake port, a first throat, a first diffuser, a first diversion port, a first retrieval device, a first pump core fixing protrusion, a power fluid channel, and a power fluid inlet. The first retrieval device is mounted on the top of the liquid-driven pump core assembly, and a power fluid inlet is provided on the lower side of the first retrieval device. The first pump core fixing protrusion is provided on the lower side of the power fluid inlet, and is fixed to the pump core support seat through the first pump core fixing protrusion. The inner cavity of the liquid-driven pump core assembly is provided with a power fluid channel, and the lower end of the power fluid channel is connected to the liquid... The hydraulic nozzle is provided with a first throat and a first diffuser below it. A first flow-switching hole is provided below the first diffuser and is connected to the mixed liquid outlet. The hydraulic pump core assembly is provided with a first formation fluid suction hole on one side of the hydraulic nozzle. The formation fluid enters the annulus formed by the inner wall of the hydraulic pump core assembly and the pump barrel assembly along the formation fluid inlet channel, and then enters the mixing zone below the hydraulic nozzle along the first formation fluid suction hole. Finally, it is discharged into the annulus of the tubing and casing along the first throat, the first diffuser, the first flow-switching hole and the mixed liquid outlet.

[0010] Preferably, a first pump cup is installed on the upper side of the above-mentioned liquid-driven pump core assembly, and is located above the first pump core fixing protrusion; the bottom end of the liquid-driven pump core assembly is a cap structure, and multiple first flow holes are distributed on the lower side wall of the liquid-driven pump core assembly, and first sealing rings are respectively installed on the lower side wall and the upper side wall of the liquid-driven pump core assembly.

[0011] The method for using a downhole jet pump suitable for gas-liquid two-phase drive, as mentioned in this invention, includes the following steps: First, a downhole jet pump suitable for gas-liquid two-phase drive, a packer, a check valve, and a tailpipe are connected through tubing and then lowered into the casing. A liquid-driven jet pump core is then inserted into the tubing in the well. The liquid-driven jet pump core is fixed by a first pump core fixing protrusion and a pump core support seat. The lower section of the liquid-driven pump core assembly is inserted into the lower pump core installation channel, the middle section is located in the central cavity, and the upper section is located in the upper pump core installation channel. The lower and upper sections of the liquid-driven pump core assembly are respectively equipped with first sealing rings on their outer walls. At the wellhead on the surface, positive circulation hydraulic jet production is carried out by injecting dynamic fluid into the tubing. Second, after the formation pressure, production capacity, and sand content have been significantly reduced, at the wellhead on the surface, by injecting power fluid into the annulus of the tubing and casing, and through reverse circulation construction, the power fluid pushes the liquid-driven jet pump core upward until it is pulled out to the surface. Third, at the wellhead on the ground, a gas-driven jet pump core is inserted into the tubing. The gas-driven jet pump core is fixed by the second pump core fixing protrusion and the pump core support seat. The lower section of the gas-driven jet pump core is inserted into the lower pump core installation channel, the middle section is located in the central cavity, and the upper section is located in the upper pump core installation channel. The lower and upper sections of the gas-driven jet pump core are respectively equipped with a second sealing ring. At the wellhead on the ground, positive circulation pneumatic jet drainage operation is carried out by injecting power gas into the tubing. In the process of injecting power fluid for positive circulation hydraulic jet drainage production, after the liquid-driven jet pump core is set in the pump assembly, the power fluid from the ground enters the power fluid inlet of the liquid-driven jet pump core along the oil pipe, continues to flow downward through the power fluid channel and is ejected through the liquid-driven nozzle, forming a low pressure at the first formation fluid suction hole, which in turn draws the formation fluid into the first throat tube for energy mixing, then flows downward into the first diffuser tube for deceleration and pressure increase, and then is discharged through the first transfer hole and the mixed liquid outlet to the annulus between the oil pipe and the casing, and then returns to the ground. In addition, during positive circulation gas jet production, after the gas-driven jet pump core is set in the pump assembly, the gas from the ground enters the gas inlet of the gas-driven jet pump core along the oil pipe. It continues downward along the gas channel through the gas through the uniformly distributed gas through hole on the fixed tail end of the pneumatic center rod, and then sprays downward along the annular space formed by the center rod body and the inner cavity of the pneumatic nozzle. A low pressure is formed at the second formation fluid suction hole, which draws the formation gas-liquid mixture into the pneumatic atomizing throat for energy mixing. It then descends into the pneumatic diffuser to decelerate and pressurize, and then is discharged through the second transfer hole and the mixture outlet to the annulus between the oil pipe and the casing, and then returns to the ground.

[0012] Preferably, by installing an atomizer below the second formation fluid intake hole, the gas-liquid mixture of the formation enters along the inwardly inclined atomizing hole, and then mixes and atomizes in the annular pneumatic atomizing throat to form a gas-water mist mixture. The gas is then decelerated and pressurized by the pneumatic diffuser before being discharged.

[0013] Preferably, for medium-deep wells, an air lift valve is added through the tubing, located above the downhole jet pump suitable for gas-liquid two-phase drive, and the inner diameter of the air lift valve is larger than the outer diameter of the liquid-driven jet pump core or the gas-driven jet pump core.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: I. This invention can optimize and change the driving mode of the jet drainage power medium in a timely manner according to the mining needs and the supply of surface power medium under the condition of no moving tubing string. The switching between liquid drive and gas drive can be achieved by simply dropping liquid-driven or gas-driven jet pump cores, which flexibly meets the needs of high-speed liquid drainage production and low-speed gas exhaust production, timely improves drainage efficiency and economic benefits, enhances the adaptability of the jet pump drainage system after changes in well condition parameters, and ensures that the downhole jet drainage system is in a good low-energy consumption operation state. Second, the present invention has a simple structure, reliable use, and easy operation for replacing the pump core. It is not only suitable for gas wells and coalbed methane wells, but also suitable for cost-reducing exploitation of oil wells and shale oil wells with large variations in formation pressure environment. Third, this invention adopts two methods: liquid drive or gas drive, and matches the gas lift valve according to the pump depth. Its tubing structure is novel, suitable for a wide range of well conditions, with large margin for system optimization and dynamic control. It is suitable for a wide range of well conditions, with low energy consumption, good reliability and excellent economy. Fourth, in addition, the air-driven jet pump core of the present invention is equipped with an atomizer. The gas-liquid mixture of the stratum enters along the inwardly inclined atomizing holes and is mixed and atomized in the annular pneumatic atomizing throat, forming a more uniform gas-water mist mixture, which makes the pump efficiency higher. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall application of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the pump barrel assembly suitable for a downhole jet drainage pump driven by gas and liquid two phases; Figure 3 yes Figure 2 Schematic diagram of AA section; Figure 4 This is a schematic diagram of the structure of the present invention with a liquid-driven jet pump core installed; Figure 5 This is a schematic diagram of the structure of the liquid-driven jet pump core of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention with the air-driven jet pump core installed; Figure 7 yes Figure 6 Schematic diagram of the BB cross section; Figure 8 This is a schematic diagram of the structure of the first embodiment of the air-driven jet pump core of the present invention; Figure 9 This is a schematic diagram of the pneumatic center rod of the present invention; Figure 10 This is a schematic diagram of the structure of a second embodiment of the air-driven jet pump core of the present invention; Figure 11 yes Figure 10 Enlarged diagram of part A in the diagram; Figure 12 This is a schematic diagram of the overall application of the gas lift valve added to this invention; In the diagram: 1. Tubing; 2. Casing; 3. Downhole jet pump; 4. Packer; 5. Check valve; 6. Tailpipe; 7. Gas lift valve. 3.1 Upper connector, 3.2 Pump cylinder assembly, 3.3 Formation fluid inlet channel, 3.4 Mixed liquid outlet, 3.5 Liquid-driven jet pump core, 3.6 Gas-driven jet pump core, 3.7 Upper pump core mounting channel, 3.8 Central cavity, 3.9 Pump core support seat, 3.10 Lower pump core mounting channel; 3.5.1 First pump cup, 3.5.2 Liquid drive pump core assembly, 3.5.3 Liquid drive nozzle, 3.5.4 First formation fluid suction hole, 3.5.5 First throat, 3.5.6 First diffuser, 3.5.7 First diversion hole, 3.5.8 First retrieval device, 3.5.9 First pump core fixing protrusion, 3.5.10 Power fluid channel, 3.5.11 Power fluid inlet, 3.5.12 First sealing ring; 3.6.1 Second pump cup, 3.6.2 Pneumatic pump core assembly, 3.6.3 Pneumatic center rod, 3.6.4 Pneumatic nozzle, 3.6.5 Second formation fluid intake port, 3.6.6 Pneumatic atomizing throat, 3.6.7 Pneumatic diffuser, 3.6.8 Second diversion port, 3.6.9 Second retrieval head, 3.6.10 Second pump core fixing protrusion, 3.6.11 Power gas channel, 3.6.12 Power gas inlet, 3.6.13 Atomizer, 3.6.14 Second sealing ring, 3.6.3.1 Fixed tail end, 3.6.3.2 Center rod body, 3.6.3.3 Gas passage hole. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] Example 1, referring to Figures 1-9The present invention discloses a downhole jet pump suitable for gas-liquid two-phase drive, comprising an upper connector 3.1, a pump barrel assembly 3.2, a formation fluid inlet channel 3.3, a mixed fluid outlet 3.4, a liquid-driven jet pump core 3.5, a gas-driven jet pump core 3.6, an upper pump core mounting channel 3.7, a central cavity 3.8, a pump core support 3.9, and a lower pump core mounting channel 3.10. The upper connector 3.1 is located at the upper end of the pump barrel assembly 3.2, and the pump core support 3.9 is located at the lower end of the upper connector 3.1. The pump core support 3.9 contains the upper pump core mounting channel 3.7. A central cavity 3.8 is located in the middle of the pump barrel assembly 3.2, and a lower pump core mounting channel 3.10 is located at the lower part of the pump barrel assembly 3.2. The system includes a channel 3.10, a formation fluid inlet channel 3.3, and a mixed liquid outlet 3.4, with the mixed liquid outlet 3.4 connected to the lower pump core installation channel 3.10. When drainage is required, the liquid-driven jet pump core 3.5 is installed in the upper pump core installation channel 3.7, the central cavity 3.8, and the lower pump core installation channel 3.10, and sits on the pump core support 3.9, injecting motive fluid for positive circulation hydraulic jet drainage production. When venting is required, the gas-driven jet pump core 3.6 is installed in the upper pump core installation channel 3.7, the central cavity 3.8, and the lower pump core installation channel 3.10, and sits on the pump core support 3.9, injecting motive gas for positive circulation pneumatic jet drainage production.

[0018] Reference Figures 8-9 The pneumatic jet pump core 3.6 mentioned in this invention includes a pneumatic pump core assembly 3.6.2, a pneumatic center rod 3.6.3, a pneumatic nozzle 3.6.4, a second formation fluid suction port 3.6.5, a pneumatic atomizing throat 3.6.6, a pneumatic diffuser 3.6.7, a second flow conversion port 3.6.8, a second retrieval head 3.6.9, a second pump core fixing protrusion 3.6.10, a power gas channel 3.6.11, and a power gas inlet 3.6.12. The second retrieval head 3.6.9 is installed on the top of the pneumatic pump core assembly 3.6.2, and the power gas inlet 3.6.12 is located on the lower side of the second retrieval head 3.6.9. The second pump core fixing protrusion 3.6.10 is located on the lower side of the power gas inlet 3.6.12. The pneumatic pump core assembly 3.6.2 has a power gas channel 3.6.11 in its inner cavity. The lower end of the power gas channel 3.6.11 is connected to a pneumatic nozzle 3.6.4. A pneumatic center rod 3.6.3 is installed at the center of the pneumatic nozzle 3.6.4, and the pneumatic center rod 3.6.3 extends toward the center of the pneumatic atomizing throat 3.6.6 below it. A pneumatic diffuser 3.6.7 is provided below the pneumatic diffuser 3.6.7. A second flow-converting hole 3.6.8 is provided on the lower outer wall of the pneumatic diffuser 3.6.7. The second flow-converting hole 3.6.8 communicates with the mixed liquid outlet 3.4. A second formation fluid suction hole 3.6.5 is provided on one side of the pneumatic nozzle 3.6.4 in the pneumatic pump core assembly 3.6.2.

[0019] Reference Figure 9 The pneumatic center rod 3.6.3 mentioned in this invention includes a fixed tail end 3.6.3.1 and a center rod body 3.6.3.2. The lower end of the fixed tail end 3.6.3.1 is connected to the center rod body 3.6.3.2. The center rod body 3.6.3.2 is located at the center of the pneumatic nozzle 3.6.4. The fixed tail end 3.6.3.1 has a cylindrical structure and its outer diameter is smaller than the inner diameter of the power gas channel 3.6.11. Gas passage holes 3.6.3.3 are evenly distributed on the fixed tail end 3.6.3.1. The power gas flows downward along the gas passage holes 3.6.3.3 and then passes through the annular space formed by the center rod body 3.6.3.2 and the inner cavity of the pneumatic nozzle 3.6.4 before being ejected downward to form a negative pressure area.

[0020] In addition, a second pump cup 3.6.1 is installed on the upper side of the aforementioned pneumatic pump core assembly 3.6.2, and is located above the second pump core fixing protrusion 3.6.10; the bottom end of the pneumatic pump core assembly 3.6.2 is a cap structure, and multiple second flow holes 3.6.8 are distributed on the lower end sidewall of the pneumatic pump core assembly 3.6.2, and second sealing rings 3.6.14 are respectively installed on the lower end sidewall and the upper end sidewall of the pneumatic pump core assembly 3.6.2.

[0021] Reference Figures 4-7The liquid-driven jet pump core 3.5 mentioned in this invention includes a liquid-driven pump core assembly 3.5.2, a liquid-driven nozzle 3.5.3, a first formation fluid intake port 3.5.4, a first throat 3.5.5, a first diffuser 3.5.6, a first flow conversion port 3.5.7, a first retrieval device 3.5.8, a first pump core fixing protrusion 3.5.9, a power fluid channel 3.5.10, and a power fluid inlet 3.5.11. The first retrieval device 3.5.8 is mounted on the top of the liquid-driven pump core assembly 3.5.2. A power fluid inlet 3.5.11 is located on the lower side of the first retrieval device 3.5.8. The first pump core fixing protrusion 3.5.9 is located on the lower side of the power fluid inlet 3.5.11, and is fixed to the pump core support base 3.9 through the cooperation of the first pump core fixing protrusion 3.5.9. A power fluid channel 3.5.10 is located within the inner cavity of the liquid-driven pump core assembly 3.5.2. The lower end of .10 is connected to the hydraulic nozzle 3.5.3. Below the hydraulic nozzle 3.5.3, a first throat 3.5.5 and a first diffuser 3.5.6 are arranged in sequence. Below the first diffuser 3.5.6, a first flow-converting hole 3.5.7 is arranged, which is connected to the mixed liquid outlet 3.4. The hydraulic pump core assembly 3.5.2 is located on one side of the hydraulic nozzle 3.5.3 and is provided with a first formation fluid suction hole 3.5.4. The formation fluid enters the annulus formed by the inner wall of the hydraulic pump core assembly 3.5.2 and the pump barrel assembly 3.2 along the formation fluid inlet channel 3.3, and then enters the mixing zone below the hydraulic nozzle 3.5.3 along the first formation fluid suction hole 3.5.4. Then it is discharged into the annulus between the tubing 1 and the casing 2 along the first throat 3.5.5, the first diffuser 3.5.6, the first flow-converting hole 3.5.7 and the mixed liquid outlet 3.4.

[0022] The first pump cup 3.5.1 is installed on the upper side of the aforementioned liquid-driven pump core assembly 3.5.2 and is located above the first pump core fixing protrusion 3.5.9; the bottom end of the liquid-driven pump core assembly 3.5.2 is a cap structure, and multiple first flow holes 3.5.7 are distributed on the lower end sidewall of the liquid-driven pump core assembly 3.5.2, and first sealing rings 3.5.12 are respectively installed on the lower end sidewall and the upper end sidewall of the liquid-driven pump core assembly 3.5.2.

[0023] The method for using a downhole jet pump suitable for gas-liquid two-phase drive, as mentioned in this invention, includes the following steps: First, a downhole jet pump 3 suitable for gas-liquid two-phase drive, a packer 4, a check valve 5, and a tailpipe 6 are connected through tubing 1 and then lowered into casing 2. A liquid-driven jet pump core 3.5 is then inserted into tubing 1 in the well. The liquid-driven jet pump core 3.5 is fixed to the pump core support 3.9 by a first pump core fixing protrusion 3.5.9. The lower section of the liquid-driven pump core assembly 3.5.2 is inserted into the lower pump core installation channel 3.10, the middle section is located in the central cavity 3.8, and the upper section is located in the upper pump core installation channel 3.7. First sealing rings 3.5.12 are installed on the outer walls of the lower and upper sections of the liquid-driven pump core assembly 3.5.2, respectively. At the surface wellhead, positive circulation hydraulic jet production is achieved by injecting kinetic fluid into tubing 1. Second, after the formation pressure, production capacity, and sand content have been significantly reduced, at the wellhead on the surface, by injecting power fluid into the annulus between tubing 1 and casing 2, and through reverse circulation construction, the power fluid pushes the liquid-driven jet pump core 3.5 upward until it is pulled out to the surface. Third, at the wellhead on the ground, a gas-driven jet pump core 3.6 is inserted into tubing 1. The gas-driven jet pump core 3.6 is fixed to the pump core support seat 3.9 by the second pump core fixing protrusion 3.6.10. The lower section of the gas-driven jet pump core 3.6 is inserted into the lower pump core installation channel 3.10, the middle section is located in the central cavity 3.8, and the upper section is located in the upper pump core installation channel 3.7. The lower and upper sections of the gas-driven jet pump core 3.6 are respectively equipped with a second sealing ring 3.6.14 on their outer walls. At the wellhead on the ground, positive circulation pneumatic jet drainage operation is carried out by injecting power gas into tubing 1. In the process of injecting power fluid for positive circulation hydraulic jet drainage production, after the hydraulic jet pump core 3.5 is set in the pump barrel assembly 3.2, the power fluid from the ground enters the power fluid inlet 3.5.11 of the hydraulic jet pump core 3.5 along the oil pipe 1, continues downward along the power fluid channel 3.5.10 and is ejected through the hydraulic nozzle 3.5.3, forming a low pressure at the first formation fluid suction hole 3.5.4, which draws the formation fluid into the first throat 3.5.5 for energy conversion and mixing, and then proceeds downward into the first diffuser 3.5.6 for deceleration and pressure increase, and then is discharged through the first transfer hole 3.5.7 and the mixed liquid discharge outlet 3.4 into the annulus between the oil pipe 1 and the casing 2, and then returns to the ground. In addition, during the positive circulation gas jet drainage production, after the gas-driven jet pump core 3.6 is set in the pump assembly 3.2, the gas from the ground enters the gas inlet 3.6.12 of the gas-driven jet pump core 3.6 along the oil pipe 1. It continues downward along the gas channel 3.6.11, passing through the gas through the uniformly distributed gas through hole 3.6.3.3 on the fixed tail end 3.6.3.1 of the pneumatic center rod 3.6.3, and then sprays downward along the annular space formed by the center rod body 3.6.3.2 and the inner cavity of the pneumatic nozzle 3.6.4. A low pressure is formed at the second formation fluid suction hole 3.6.5, which draws the formation gas-liquid mixture into the pneumatic atomizing throat 3.6.6 for energy conversion and mixing. It then descends into the pneumatic diffuser 3.6.7 for deceleration and pressurization, and is discharged through the second transfer hole 3.6.8 and the mixture discharge outlet 3.4 into the annulus between the oil pipe 1 and the casing 2, and then returns to the ground.

[0024] Example 2: A downhole jet pump suitable for gas-liquid two-phase drive, as mentioned in this invention, includes an upper connector 3.1, a pump barrel assembly 3.2, a formation fluid inlet channel 3.3, a mixed fluid outlet 3.4, a liquid-driven jet pump core 3.5, a gas-driven jet pump core 3.6, an upper pump core mounting channel 3.7, a central cavity 3.8, a pump core support 3.9, and a lower pump core mounting channel 3.10. The upper connector 3.1 is located at the upper end of the pump barrel assembly 3.2, and the pump core support 3.9 is located at the lower end of the upper connector 3.1. The pump assembly 3.9 has an upper pump core mounting channel 3.7; a central cavity 3.8 is provided in the middle of the pump barrel assembly 3.2; a lower pump core mounting channel 3.10, a formation fluid inlet channel 3.3, and a mixed liquid outlet 3.4 are provided at the lower part of the pump barrel assembly 3.2, and the mixed liquid outlet 3.4 is connected to the lower pump core mounting channel 3.10; a liquid-driven jet pump core 3.5 or a gas-driven jet pump core 3.6 is installed in the upper pump core mounting channel 3.7, the central cavity 3.8, and the lower pump core mounting channel 3.10, and sits on the pump core support 3.9.

[0025] The difference from Example 1 is: Reference Figures 10-11 An atomizer 3.6.13 is installed on the outside of the pneumatic nozzle 3.6.4 and below the second formation fluid intake port 3.6.5. The atomizer 3.6.13 is an annular body with evenly distributed inwardly inclined atomizing holes. When the power gas is injected for positive circulation gas jet drainage production, the gas-liquid mixture of the formation enters along the inwardly inclined atomizing holes. Then, it is mixed and atomized in the annular pneumatic atomizing throat 3.6.6 to form a gas-water mist mixture. The gas is then decelerated and pressurized through the pneumatic diffuser 3.6.7 for drainage.

[0026] Example 3: A downhole jet pump suitable for gas-liquid two-phase drive, as mentioned in this invention, includes an upper connector 3.1, a pump barrel assembly 3.2, a formation fluid inlet channel 3.3, a mixed fluid outlet 3.4, a liquid-driven jet pump core 3.5, a gas-driven jet pump core 3.6, an upper pump core mounting channel 3.7, a central cavity 3.8, a pump core support 3.9, and a lower pump core mounting channel 3.10. The upper connector 3.1 is located at the upper end of the pump barrel assembly 3.2, and the pump core support 3.9 is located at the lower end of the upper connector 3.1. The pump assembly 3.9 has an upper pump core mounting channel 3.7; a central cavity 3.8 is provided in the middle of the pump barrel assembly 3.2; a lower pump core mounting channel 3.10, a formation fluid inlet channel 3.3, and a mixed liquid outlet 3.4 are provided at the lower part of the pump barrel assembly 3.2, and the mixed liquid outlet 3.4 is connected to the lower pump core mounting channel 3.10; a liquid-driven jet pump core 3.5 or a gas-driven jet pump core 3.6 is installed in the upper pump core mounting channel 3.7, the central cavity 3.8, and the lower pump core mounting channel 3.10, and sits on the pump core support 3.9.

[0027] The difference from Example 2 is: For medium-deep wells, refer to Figure 12 In this invention, an additional 1-3 stage air lift valve 7 is connected to the oil pipe 1 and is located above the downhole jet pump 3 suitable for gas-liquid two-phase drive. The inner diameter of the air lift valve 7 is larger than the outer diameter of the liquid-driven jet pump core 3.5 or the gas-driven jet pump core 3.6.

[0028] In addition, when using this invention, for gas wells with a low liquid-to-gas ratio in the early stage but a high liquid-to-gas ratio in the later stage due to water immersion, a gas-driven jet can be used first, and then converted to a liquid-driven jet.

[0029] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A downhole jet pump suitable for gas-liquid two-phase drive, comprising a pump barrel assembly (3.2), characterized in that: It also includes an upper connector (3.1), a formation fluid inlet pump channel (3.3), a mixed liquid outlet (3.4), a liquid-driven jet pump core (3.5), a gas-driven jet pump core (3.6), an upper pump core mounting channel (3.7), a central cavity (3.8), a pump core support seat (3.9), and a lower pump core mounting channel (3.10). The upper end of the pump assembly (3.2) is provided with an upper connector (3.1), and the lower end of the upper connector (3.1) is provided with a pump core support seat (3.9). The pump core support seat (3.9) is provided with an upper pump core mounting channel (3.7). A central cavity (3.8) is provided in the middle of the pump assembly (3.2), and a lower pump core mounting channel (3.10) and a formation fluid inlet pump channel are provided in the lower part of the pump assembly (3.2). The system includes a channel (3.3) and a mixed liquid outlet (3.4), the mixed liquid outlet (3.4) being connected to the lower pump core installation channel (3.10); when drainage is required, the liquid-driven jet pump core (3.5) is installed in the upper pump core installation channel (3.7), the central cavity (3.8) and the lower pump core installation channel (3.10), and sits on the pump core support seat (3.9), injecting motive fluid for positive circulation hydraulic jet drainage production; when venting is required, the gas-driven jet pump core (3.6) is installed in the upper pump core installation channel (3.7), the central cavity (3.8) and the lower pump core installation channel (3.10), and sits on the pump core support seat (3.9), injecting motive gas for positive circulation pneumatic jet drainage production; The air-driven jet pump core (3.6) includes a pneumatic pump core assembly (3.6.2), a pneumatic center rod (3.6.3), a pneumatic nozzle (3.6.4), a second formation fluid intake port (3.6.5), a pneumatic atomizing throat (3.6.6), a pneumatic diffuser (3.6.7), a second diversion port (3.6.8), a second retrieval head (3.6.9), a second pump core fixing protrusion (3.6.10), a power gas channel (3.6.11), and a power gas inlet (3.6.12). The second retrieval head (3.6.9) is installed on the top of the pneumatic pump core assembly (3.6.2). A power gas inlet (3.6.12) is located on the lower side of the second retrieval head (3.6.9), and a second pump core fixing protrusion (3.6.10) is located on the lower side of the power gas inlet (3.6.12). The inner cavity of the pump core assembly (3.6.2) is provided with a power gas channel (3.6.11). The lower end of the power gas channel (3.6.11) is connected to a pneumatic nozzle (3.6.4). A pneumatic center rod (3.6.3) is installed at the center of the pneumatic nozzle (3.6.4). The pneumatic center rod (3.6.3) extends to the center of the pneumatic atomizing throat (3.6.6) below. A pneumatic diffuser (3.6.7) is provided below the pneumatic atomizing throat (3.6.6). A second flow-converting hole (3.6.8) is provided on the outer wall below the pneumatic diffuser (3.6.7). The second flow-converting hole (3.6.8) is connected to the mixed liquid outlet (3.4). A second formation fluid suction hole (3.6.5) is provided on one side of the pneumatic nozzle (3.6.4) of the pneumatic pump core assembly (3.6.2).

2. The downhole jet pump suitable for gas-liquid two-phase drive according to claim 1, characterized in that: An atomizer (3.6.13) is installed on the outside of the pneumatic nozzle (3.6.4) and below the second formation fluid intake port (3.6.5). The atomizer (3.6.13) is an annular body with evenly distributed inwardly inclined atomizing holes.

3. The downhole jet pump suitable for gas-liquid two-phase drive according to claim 2, characterized in that: The pneumatic center rod (3.6.3) includes a fixed tail end (3.6.3.1) and a center rod body (3.6.3.2). The lower end of the fixed tail end (3.6.3.1) is connected to the center rod body (3.6.3.2). The center rod body (3.6.3.2) is located at the center of the pneumatic nozzle (3.6.4). The fixed tail end (3.6.3.1) is a cylindrical structure with an outer diameter smaller than the inner diameter of the power gas channel (3.6.11). Gas passage holes (3.6.3.3) are evenly distributed on the fixed tail end (3.6.3.1). The power gas flows downward along the gas passage holes (3.6.3.3) and then passes through the annular space formed by the center rod body (3.6.3.2) and the inner cavity of the pneumatic nozzle (3.6.4) before being ejected downward to form a negative pressure area.

4. The downhole jet pump suitable for gas-liquid two-phase drive according to claim 3, characterized in that: A second pump cup is installed on the upper side of the pneumatic pump core assembly (3.6.2). 3.6.1), and located above the second pump core fixing protrusion (3.6.10); the bottom end of the pneumatic pump core assembly (3.6.2) is a cap structure, and multiple second flow holes (3.6.8) are distributed on the lower side wall of the pneumatic pump core assembly (3.6.2), and second sealing rings (3.6.14) are respectively installed on the lower side wall and the upper side wall of the pneumatic pump core assembly (3.6.2).

5. The downhole jet pump suitable for gas-liquid two-phase drive according to claim 4, characterized in that: The liquid-driven jet pump core (3.5) includes a liquid-driven pump core assembly (3.5.2), a liquid-driven nozzle (3.5.3), a first formation fluid intake port (3.5.4), a first throat (3.5.5), a first diffuser (3.5.6), a first diversion port (3.5.7), a first retrieval device (3.5.8), a first pump core fixing protrusion (3.5.9), a power fluid channel (3.5.10), and a power fluid inlet (3.5.11). The first retrieval device (3.5.8) is installed on the top of the liquid-driven pump core assembly (3.5.2). The power fluid inlet (3.5.11) is located on the lower side of the first retrieval device (3.5.8). The first pump core fixing protrusion (3.5.11) is located on the lower side of the power fluid inlet (3.5.11). 5.9), the first pump core fixing protrusion (3.5.9) is fixed to the pump core support seat (3.9) through cooperation; the inner cavity of the liquid-driven pump core assembly (3.5.2) is provided with a power fluid channel (3.5.10), the lower end of the power fluid channel (3.5.10) is connected to the liquid-driven nozzle (3.5.3), the liquid-driven nozzle (3.5.3) is provided with a first throat (3.5.5) and a first diffuser (3.5.6) in sequence below it, the first diversion hole (3.5.7) is provided below the first diffuser (3.5.6), and the first diversion hole (3.5.7) is connected to the mixed liquid outlet (3.4); the liquid-driven pump core assembly (3.5.2) is provided with a first formation fluid suction hole on one side of the liquid-driven nozzle (3.5.3) ( 3.5.4), the formation fluid enters the annulus formed by the inner wall of the liquid drive pump core assembly (3.5.2) and the pump barrel assembly (3.2) along the formation fluid inlet pump channel (3.3), and then enters the mixing zone below the liquid drive nozzle (3.5.3) along the first formation fluid suction hole (3.5.4), and then is discharged into the annulus of the tubing (1) and casing (2) along the first throat (3.5.5), the first diffuser (3.5.6), the first swirl hole (3.5.7) and the mixed fluid outlet (3.4).

6. The downhole jet pump suitable for gas-liquid two-phase drive according to claim 5, characterized in that: The upper side of the liquid-driven pump core assembly (3.5.2) is provided with a first pump cup (3.5.1) and is located above the first pump core fixing protrusion (3.5.9); the bottom end of the liquid-driven pump core assembly (3.5.2) is a cap structure, and multiple first flow holes (3.5.7) are distributed on the lower side wall of the liquid-driven pump core assembly (3.5.2), and first sealing rings (3.5.12) are respectively installed on the lower side wall and the upper side wall of the liquid-driven pump core assembly (3.5.2).

7. A method of using a downhole jet pump suitable for gas-liquid two-phase drive as described in claim 6, characterized in that: The process includes the following: First, a downhole jet pump (3), packer (4), check valve (5), and tailpipe (6) suitable for gas-liquid two-phase drive are connected through the tubing (1), and then the tubing is lowered into the casing (2). Then, the liquid-driven jet pump core (3.5) is put into the tubing (1) in the well. The liquid-driven jet pump core (3.5) is fixed with the pump core support seat (3.9) through the first pump core fixing protrusion (3.5.9). The lower section of the liquid-driven pump core assembly (3.5.2) is inserted into the lower pump core installation channel (3.10), the middle section is located in the central cavity (3.8), and the upper section is located in the upper pump core installation channel (3.7). The lower and upper sections of the liquid-driven pump core assembly (3.5.2) are respectively equipped with the first sealing ring (3.5.12). At the wellhead on the surface, positive circulation hydraulic jet production is carried out by injecting dynamic fluid into the tubing (1). Second, after the formation pressure, production capacity and sand content are significantly reduced, at the wellhead on the surface, by injecting power fluid into the annulus between the tubing (1) and the casing (2), through reverse circulation construction, the power fluid pushes the liquid-driven jet pump core (3.5) upward until it is pulled out to the surface; Third, at the wellhead on the ground, a gas-driven jet pump core (3.6) is inserted into the tubing (1). The gas-driven jet pump core (3.6) is fixed to the pump core support seat (3.9) through the second pump core fixing protrusion (3.6.10). The lower section of the gas-driven jet pump core (3.6) is inserted into the lower pump core installation channel (3.10), the middle section is located in the central cavity (3.8), and the upper section is located in the upper pump core installation channel (3.7). The lower and upper sections of the gas-driven jet pump core (3.6) are respectively equipped with a second sealing ring (3.6.14). At the wellhead on the ground, positive circulation pneumatic jet drainage operation is carried out by injecting power gas into the tubing (1). In the process of injecting power fluid for positive circulation hydraulic jet drainage production, after the liquid-driven jet pump core (3.5) is set in the pump barrel assembly (3.2), the power fluid from the ground enters the power fluid inlet (3.5.11) of the liquid-driven jet pump core (3.5) along the oil pipe (1), continues to flow downward through the liquid-driven nozzle (3.5.3) along the power fluid channel (3.5.10), and forms a low pressure at the first formation fluid suction hole (3.5.4), which draws the formation fluid into the first throat pipe (3.5.5) for energy conversion and mixing. Then it flows downward into the first diffuser pipe (3.5.6) for deceleration and pressure increase, and then flows through the first transfer hole (3.5.7) and the mixed liquid outlet (3.4) to the annulus between the oil pipe (1) and the casing (2), and then returns to the ground. In addition, during the positive circulation gas jet drainage production process, after the gas-driven jet pump core (3.6) is set in the pump barrel assembly (3.2), the power gas from the ground enters the power gas inlet (3.6.12) of the gas-driven jet pump core (3.6) along the oil pipe (1), and continues downward along the power gas channel (3.6.11) through the gas through hole (3.6.3.3) evenly distributed on the fixed tail end (3.6.3.1) of the pneumatic center rod (3.6.3), and then... The gas is ejected downwards along the annular space formed by the central rod body (3.6.3.2) and the inner cavity of the pneumatic nozzle (3.6.4), and a low pressure is formed at the second formation fluid intake hole (3.6.5). The formation gas-liquid mixture is then injected into the pneumatic atomizing throat (3.6.6) for energy conversion and mixing. It then descends into the pneumatic diffuser (3.6.7) for deceleration and pressure increase. Finally, it is discharged through the second diversion hole (3.6.8) and the mixture outlet (3.4) into the annulus between the tubing (1) and the casing (2), and then returns to the surface.

8. The method of using the downhole jet pump suitable for gas-liquid two-phase drive according to claim 7, characterized in that: By installing an atomizer (3.6.13) below the second formation fluid intake hole (3.6.5), the gas-liquid mixture of the formation enters along the inwardly inclined atomizing hole, and then mixes and atomizes in the annular pneumatic atomizing throat (3.6.6) to form a gas-water mist mixture. The gas is then decelerated and pressurized by the pneumatic diffuser (3.6.7) for discharge.

9. The method of using the downhole jet pump suitable for gas-liquid two-phase drive according to claim 8, characterized in that: for In medium-deep wells, an air lift valve (7) is added through the tubing (1) and located above the downhole jet pump (3) suitable for gas-liquid two-phase drive. The inner diameter of the air lift valve (7) is larger than the outer diameter of the liquid-driven jet pump core (3.5) or the gas-driven jet pump core (3.6).

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