Gas-liquid cyclone separation device and separation method

Abstract

The application discloses a downhole gas-liquid ring vortex separation device, which comprises a nozzle connector in the shape of a cylinder, the nozzle connector is sequentially connected with a lower connecting pipe, a gas distribution connector in the shape of a cylinder, an upper connecting pipe and an exhaust connecting assembly in the shape of a cylinder; a flow control nozzle in the shape of a cone is arranged in the nozzle connector and the lower connecting pipe, the outer wall of the port with a large diameter of the flow control nozzle is buckled with the inner wall of the nozzle connector, a gas-liquid separation assembly in the shape of an inverted cone is arranged in the gas distribution connector and the upper connecting pipe, a gas guide pipe is connected with the port away from the gas distribution connector, and the gas guide pipe is arranged in the upper connecting pipe and the exhaust connecting assembly, and a downhole gas-liquid ring vortex separation method is also disclosed.

Description

Technical Field

[0001] This invention belongs to the technical field of oil well gas-liquid separation devices, specifically relating to downhole gas-liquid vortex separation devices, and also to downhole gas-liquid vortex separation methods. Background Technology

[0002] In oilfield mechanized wells, the fluid flowing from the formation into the wellbore is a mixture of oil, gas, and water. Gas entering the pump affects the efficiency of the mechanized production system, and in severe cases, can lead to gas lock-in and dry pumping. To improve the efficiency of mechanized production systems, various types of "gas anchors," or downhole degassing and gas prevention devices, are installed at the inlet of the downhole pump in mechanized wells, and different casing gas release technologies are used at the wellhead to minimize the amount of gas entering the pump. However, in different oilfields at different development stages, the oil-gas ratio, water cut ratio, and production rate of oil wells vary, resulting in differences in downhole gas-liquid separation technology and wellbore venting and casing gas release technologies.

[0003] Currently, downhole degassing and gas prevention devices and technologies in oilfields are mainly provided by suppliers, lacking specificity. Particularly in high-gas-oil-ratio wells, problems such as gas entering the pump, gas interference, dry pumping, and impacts on well production and the efficiency of mechanical pumping systems remain prominent.

[0004] The project was established with mechanical production efficiency as its core focus. It investigates the downhole gas-liquid flow patterns, the impact of liquid-gas mixing on pump efficiency and mechanical production system efficiency, downhole gas-liquid separation, wellbore venting and wellhead gas release technologies and their adaptability in high oil-gas ratio mechanical production wells. Through research, it further designs downhole gas prevention tools suitable for high oil and gas ratio wells in Qinghai Oilfield, and refines them through field tests to form a gas prevention technology suitable for high oil-gas ratio wells in Qinghai Oilfield.

[0005] Analysis of the current domestic and international technological status: Gas prevention technology in mechanically operated wells is one of the fundamental process technologies. It relies on the optimization of downhole tooling and tubing design, as well as wellhead gas release processes, to address the impact of gas in mechanically operated wells. The key is the "gas anchor," i.e., downhole gas-liquid separation technology and its adaptability to mechanically operated wells. Currently, the "gas anchors" used in oilfields can be mainly classified into three types based on their principles: Gravity-driven gas-liquid separation: The principle is gravity separation technology. The pump is designed with a core tube and an outer tube. Oil and gas first enter the annulus of the core tube and outer tube. The gas rises through the gas shroud, through the oil casing annulus, and is released at the wellhead; the liquid flows downwards by gravity and returns to the pump through the core tube. This reduces the gas content of the fluid entering the pump and minimizes the impact of gas on deep well pumps. Main problems: To improve efficiency or adapt to high-gas-volume oil wells, a larger cross-section is needed, which is limited by the casing diameter. Therefore, it is more suitable for low-oil-gas ratio, low-production wells.

[0006] Spiral gas-liquid separation: The principle is based on cyclone separation technology. The pump design still uses a core tube and outer tube, or may be further designed with an outer tube, liner, and core tube. Spiral blades are designed between the core tube or liner and the outer tube. Oil and gas first enter the annulus of the core tube or liner and outer tube, swirling. Gas enters the annulus of the core tube and liner and rises upwards, or rises in a reverse spiral upwards inside the annulus of the core tube and outer tube, passing through the gas shroud and the oil casing annulus to the wellhead for venting. Liquid swirles downwards in the annulus of the liner and outer tube, or swirles downwards outside the core tube and outer tube, and then returns to the pump through the core tube. The separation efficiency is higher than that of ordinary types, and with proper design, it can adapt to wells with high oil-to-gas ratios and can separate most of the gas.

[0007] A combination of gravity reflux separation and spiral separation: Based on spiral gas-liquid separation, the tail tube and core tube are lengthened, i.e., the upper section is spiral separation; the lower section is gravity reflux separation. It has strong adaptability, but increases the resistance of liquid flow into the pump and increases the submersion requirement.

[0008] In addition, there are air pumps and internal shielding devices, but their application is rudimentary and the results are not ideal. Summary of the Invention

[0009] The purpose of this invention is to provide a downhole gas-liquid vortex separator, which solves the problem in the prior art where the gas-liquid separation effect is reduced due to the limitations of downhole pipeline diameter and structure.

[0010] Another objective of this invention is to provide a downhole gas-liquid vortex separation method, which solves the problem of reduced gas-liquid separation efficiency caused by unreasonable pipe size and structure settings in the prior art.

[0011] The technical solution adopted in this invention is a downhole gas-liquid vortex separator, including a cylindrical nozzle joint. The nozzle joint is sequentially connected to a lower connecting pipe, a cylindrical gas distributor, an upper connecting pipe, and a cylindrical exhaust connection assembly. A conical flow control nozzle is provided in both the nozzle joint and the lower connecting pipe. The outer wall of the larger diameter port of the flow control nozzle is fastened to the inner wall of the nozzle joint. An inverted conical gas-liquid separation assembly is provided in both the gas distributor and the upper connecting pipe. A gas guide pipe is connected to the gas separation assembly at the port away from the gas distributor. The gas guide pipe is located inside the upper connecting pipe and the exhaust connection assembly.

[0012] The invention is further characterized by: The axis of the nozzle connector coincides with the axis of the flow control nozzle, the gas-liquid separation assembly, and the air guide pipe, respectively.

[0013] The gas-liquid separation assembly includes a cylindrical delivery pipe connected to a conical air passage pipe. The delivery pipe is connected to the large-diameter port of the air passage pipe. A first air intake assembly is located between the delivery pipe near the control nozzle port and the inner wall of the gas distributor. An outer conical sleeve is fitted over the air passage pipe, and the length of the air passage pipe is no greater than the length of the outer conical sleeve. There is a gap between the air guide pipe and the upper connecting pipe. A second air intake assembly is located between the air passage pipe and the outer conical sleeve, near the delivery pipe port of the air passage pipe. Several first liquid passage holes are opened on the side wall of the air passage pipe, and several second liquid passage holes are opened on the side wall of the outer conical sleeve. The first liquid passage holes and the second liquid passage holes are all located on the same radius line on the end face of the air passage pipe. A connecting plate connects the first liquid passage holes and the second liquid passage holes located on the same radius line. The first liquid passage holes, the second liquid passage holes, and the connecting plate form a channel. The air guide pipe is connected to the outer conical sleeve.

[0014] The first air intake assembly includes a first annular plate, which is sleeved with a delivery pipe. The side wall of the first annular plate has a plurality of first vent holes along the axial direction of the first annular plate, and the side wall of the first annular plate has a first annular groove along the circumferential direction of the first annular plate. The second air intake assembly includes a second annular plate, which is sleeved with an air passage pipe. The side wall of the second annular plate has a plurality of second vent holes along the axial direction of the second annular plate, and the side wall of the second annular plate has a second annular groove along the circumferential direction of the second annular plate.

[0015] A number of first vent holes are set at equal intervals, and a number of second vent holes are set at equal intervals, with the first vent holes and the second vent holes being set opposite to each other.

[0016] A first rubber ring is fitted inside the first annular groove, and the first rubber ring is in contact with the inner wall of the gas distributor. A second rubber ring is fitted inside the second annular groove, and the second rubber ring is in contact with the inner wall of the upper connecting pipe.

[0017] The exhaust connection assembly includes a solid connecting pipe that communicates with the upper connecting pipe. Inside the connecting pipe are two oil supply pipes positioned opposite each other about the axis of the connecting pipe. Both oil supply pipes are in contact with the inner wall of the connecting pipe. An adapter is provided on the two oil supply pipes away from the port of the air guide pipe. A space is formed between the center of the connecting pipe and the two oil supply pipes. A steel ball is placed in the space and mates with the port of the air guide pipe. An exhaust hole is opened on the side wall of the connecting pipe and mates with the steel ball.

[0018] Another technical solution adopted in this invention is a downhole gas-liquid vortex separation method, which uses a downhole gas-liquid vortex separation device and specifically includes the following operating steps: Step 1: Deliver the gas-liquid mixture into the nozzle connector; Step 2: The gas-liquid mixture forms an annular vortex at the flow control nozzle, and the gas separated from the gas-liquid mixture is transported to the first air intake assembly, while the liquid is transported to the delivery pipe; Step 3: After the liquid is delivered to the gas pipe, it flows through the second liquid passage to the oil pipe for collection. After the gas is delivered to the gas guide pipe, it is collected at the exhaust port.

[0019] The beneficial effects of this invention are: In the downhole gas-liquid vortex separator of the present invention, the flow control nozzle is configured such that gas and liquid form an annular vortex at the small-diameter port of the flow control nozzle, separating the gas and liquid and allowing them to be transported through different pathways. The gas-liquid separation component further precisely separates the gas and liquid components after the initial separation. The separated gas and liquid are collected through the exhaust connection component. This device is not affected by the pipe diameter and utilizes the physical properties of gas and liquid and the structural design of the pipe to improve the gas-liquid separation effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the downhole gas-liquid vortex separation device of the present invention; Figure 2 This is a schematic diagram of the gas-liquid separation component in the downhole gas-liquid vortex separator of the present invention; Figure 3 This is a schematic diagram of the first air intake component in the downhole gas-liquid vortex separator of the present invention; Figure 4 This is a schematic diagram of the second air intake component in the downhole gas-liquid vortex separator of the present invention; Figure 5 This is a schematic diagram of the exhaust connection component in the downhole gas-liquid vortex separator of the present invention.

[0021] In the diagram, 1. Nozzle connector, 2. Lower connecting pipe, 3. Flow control nozzle, 4. Gas distributor connector, 5. Upper connecting pipe, 6. Exhaust connection assembly, 601. Connecting pipe, 602. Oil supply pipe, 603. Adapter, 604. Exhaust port, 605. Steel ball, 7. Gas-liquid separation assembly, 701. Delivery pipe, 702. Air passage pipe, 703. First air intake assembly, 7031. First annular plate, 7032. First vent hole, 7033. First annular groove, 7034. First rubber ring, 704. Outer cone sleeve, 705. Second air intake assembly, 7051. Second annular plate, 7052. Second vent hole, 7053. Second annular groove, 7054. Second rubber ring, 706. First liquid passage hole, 707. Connecting plate, 708. Second liquid passage hole, 8. Air guide pipe. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] The downhole gas-liquid vortex separator of the present invention, such as Figure 1As shown, the technical solution adopted in this invention is a downhole gas-liquid vortex separator, including a cylindrical nozzle connector 1. The nozzle connector 1 is sequentially connected to a lower connecting pipe 2, a cylindrical gas distributor 4, an upper connecting pipe 5, and a cylindrical exhaust connection assembly 6. A conical flow control nozzle 3 is provided in both the nozzle connector 1 and the lower connecting pipe 2. The outer wall of the larger diameter port of the flow control nozzle 3 is fastened to the inner wall of the nozzle connector 1. An inverted conical gas-liquid separation assembly 7 is provided in both the gas distributor 4 and the upper connecting pipe 5. A gas guide pipe 8 is connected to the port of the gas separator 7 away from the gas distributor 4. The gas guide pipe 8 is located within the upper connecting pipe 5 and the exhaust connection assembly 6.

[0024] The axis of nozzle connector 1 coincides with the axes of flow control nozzle 3, gas-liquid separation component 7 and air guide pipe 8, respectively.

[0025] like Figure 2 As shown, the gas-liquid separation assembly 7 includes a cylindrical delivery pipe 701, which is connected to a conical air passage pipe 702. The delivery pipe 701 is connected to the large-diameter port of the air passage pipe 702. A first air intake assembly 703 is provided between the port of the delivery pipe 701 near the flow control nozzle 3 and the inner wall of the air distribution connector 4. An outer conical sleeve 704 is fitted over the air passage pipe 702. The length of the air passage pipe 702 is not greater than the length of the outer conical sleeve 704. There is a gap between the air guide pipe 8 and the upper connecting pipe 5. A second air intake assembly 705 is provided between the air passage pipe 702 and the outer conical sleeve 704. Component 705 is installed at the port of the air passage pipe 702 near the delivery pipe 701. The side wall of the air passage pipe 702 has several first liquid passage holes 706, and the side wall of the outer conical sleeve 704 has several second liquid passage holes 708. The first liquid passage holes 706 and the second liquid passage holes 708 are all located on the same radius line on the end face of the air passage pipe 702. A connecting plate 707 connects the first liquid passage holes 706 and the second liquid passage holes 708 located on the same radius line. The first liquid passage holes 706, the second liquid passage holes 708 and the connecting plate 707 form a channel, and the air guide pipe 8 is connected to the outer conical sleeve 704.

[0026] The first air intake assembly 703 includes a first annular plate 7031, which is sleeved with a delivery pipe 701. The sidewall of the first annular plate 7031 has a plurality of first vent holes 7032 along the axial direction of the first annular plate 7031, and the sidewall of the first annular plate 7031 has a first annular groove 7033 along the circumferential direction of the first annular plate 7031. The second air intake assembly 705 includes a second annular plate 7051, which is sleeved with an air passage pipe 702. The sidewall of the second annular plate 7051 has a plurality of second vent holes 7052 along the axial direction of the second annular plate 7051, and the sidewall of the second annular plate 7051 has a second annular groove 7053 along the circumferential direction of the second annular plate 7051.

[0027] A plurality of first vent holes 7032 are arranged at equal intervals, and a plurality of second vent holes 7052 are arranged at equal intervals, with the first vent holes 7032 and the second vent holes 7052 being arranged opposite to each other.

[0028] A first rubber ring 7034 is fitted inside the first annular groove 7033. The first rubber ring 7034 is in contact with the inner wall of the air distribution connector 4, such as... Figure 3 As shown; a second rubber ring 7054 is fitted inside the second annular groove 7053, and the second rubber ring 7054 is in contact with the inner wall of the upper connecting pipe 5, as shown. Figure 4 As shown.

[0029] like Figure 5 As shown, the exhaust connection assembly 6 includes a solid connecting pipe 601, which is connected to the upper connecting pipe 5. Two oil supply pipes 602 are provided inside the connecting pipe 601, which are positioned opposite each other about the axis of the connecting pipe 601. Both oil supply pipes 602 are in contact with the inner wall of the connecting pipe 601. An adapter 603 is provided at the port of the two oil supply pipes 602 away from the air guide pipe 8. A space is formed between the center of the connecting pipe 601 and the two oil supply pipes 602. A steel ball 605 is provided in the space. The steel ball 605 is engaged with the port of the air guide pipe 8. An exhaust hole 604 is opened on the side wall of the connecting pipe 601, which is engaged with the steel ball 605.

[0030] The downhole gas-liquid vortex separation method, using a downhole gas-liquid vortex separator, specifically includes the following operating steps: Step 1: Deliver the gas-liquid mixture into nozzle connector 1; Step 2: The gas-liquid mixture forms an annular vortex at the flow control nozzle 3 and transports the gas separated from the gas-liquid mixture to the first air intake assembly 703, and the liquid to the delivery pipe 701; Step 3: After the liquid is delivered to the gas pipe 702, it flows through the second liquid passage hole 708 to the oil pipe 602 for collection. After the gas is delivered to the gas guide pipe 8, it is collected at the exhaust hole 604.

[0031] The flow control nozzle 3 is cone-shaped. After the gas-liquid mixture passes through the flow control nozzle 3, a local longitudinal annular vortex is formed, which separates the gas from the gas-liquid mixture. A low-pressure zone is formed at the small-diameter port of the flow control nozzle 3 under the longitudinal annular vortex. The gas enters the space formed by the delivery pipe 701, the air passage pipe 702 and the first annular plate 7031 through the first vent hole 7032. The liquid flows in the delivery pipe 701. The gas flows through the second vent hole 7052 and enters the air guide pipe 8. When the gas pressure is sufficient, the blowing steel ball 605 does not contact the port of the air guide pipe 8. At this time, the gas is collected or discharged through the exhaust hole 604. The liquid flows through the first liquid passage hole 706 and the second liquid passage hole 708 and flows in the space between the air guide pipe 8 and the connecting pipe 601. After flowing to the oil delivery pipe 602, the liquid is collected through the adapter 603.

[0032] In the gas-liquid separation component 7, the first liquid passage hole 706, the second liquid passage hole 708, and the connecting plate 707 form a channel to facilitate the flow of liquid. The first liquid passage hole 706 is located on the side wall of the gas passage pipe 702, and the second liquid passage hole 708 is located on the side wall of the outer conical sleeve 704. The remaining space between the gas passage pipe 702 and the outer conical sleeve 704 is filled with gas. The first rubber ring 7034 and the second rubber ring 7054 ensure the airtightness during gas transmission. After the gas passes through the flow control nozzle 3, gas separation is performed, which improves the gas-liquid separation effect.

[0033] The oil pipeline 602 and adapter 603 are designed in a crescent shape, which increases the transport area and fits snugly with the connecting pipe 601, increasing stability during liquid collection. The downhole gas-liquid vortex separator can be stacked for use, further enhancing the separation effect under suitable operating conditions. This downhole gas-liquid vortex separator can be used in mechanically operated wells with low submersion and high oil-gas ratios.

[0034] Example 1 The present invention relates to a downhole gas-liquid vortex separation device, comprising the technical solution adopted herein, a downhole gas-liquid vortex separation device, including a cylindrical nozzle joint 1, the nozzle joint 1 being sequentially connected to a lower connecting pipe 2, a cylindrical gas distribution joint 4, an upper connecting pipe 5, and a cylindrical exhaust connection assembly 6; a conical flow control nozzle 3 is provided in both the nozzle joint 1 and the lower connecting pipe 2, the outer wall of the larger diameter port of the flow control nozzle 3 being fastened to the inner wall of the nozzle joint 1; an inverted conical gas-liquid separation assembly 7 is provided in both the gas distribution joint 4 and the upper connecting pipe 5, the port of the gas-liquid separation assembly 7 away from the gas distribution joint 4 being connected to a gas guide pipe 8, the gas guide pipe 8 being located within the upper connecting pipe 5 and the exhaust connection assembly 6.

[0035] Example 2 The present invention relates to a downhole gas-liquid vortex separation device, comprising the technical solution adopted herein, a downhole gas-liquid vortex separation device, including a cylindrical nozzle joint 1, the nozzle joint 1 being sequentially connected to a lower connecting pipe 2, a cylindrical gas distribution joint 4, an upper connecting pipe 5, and a cylindrical exhaust connection assembly 6; a conical flow control nozzle 3 is provided in both the nozzle joint 1 and the lower connecting pipe 2, the outer wall of the larger diameter port of the flow control nozzle 3 being fastened to the inner wall of the nozzle joint 1; an inverted conical gas-liquid separation assembly 7 is provided in both the gas distribution joint 4 and the upper connecting pipe 5, the port of the gas-liquid separation assembly 7 away from the gas distribution joint 4 being connected to a gas guide pipe 8, the gas guide pipe 8 being located within the upper connecting pipe 5 and the exhaust connection assembly 6.

[0036] The axis of nozzle connector 1 coincides with the axes of flow control nozzle 3, gas-liquid separation component 7 and air guide pipe 8, respectively.

[0037] Example 3 The present invention relates to a downhole gas-liquid vortex separation device, comprising the technical solution adopted herein, a downhole gas-liquid vortex separation device, including a cylindrical nozzle joint 1, the nozzle joint 1 being sequentially connected to a lower connecting pipe 2, a cylindrical gas distribution joint 4, an upper connecting pipe 5, and a cylindrical exhaust connection assembly 6; a conical flow control nozzle 3 is provided in both the nozzle joint 1 and the lower connecting pipe 2, the outer wall of the larger diameter port of the flow control nozzle 3 being fastened to the inner wall of the nozzle joint 1; an inverted conical gas-liquid separation assembly 7 is provided in both the gas distribution joint 4 and the upper connecting pipe 5, the port of the gas-liquid separation assembly 7 away from the gas distribution joint 4 being connected to a gas guide pipe 8, the gas guide pipe 8 being located within the upper connecting pipe 5 and the exhaust connection assembly 6.

[0038] The axis of nozzle connector 1 coincides with the axes of flow control nozzle 3, gas-liquid separation component 7 and air guide pipe 8, respectively.

[0039] The gas-liquid separation component 7 includes a cylindrical delivery pipe 701, which is connected to a conical air passage pipe 702. The delivery pipe 701 is connected to the large-diameter port of the air passage pipe 702. A first air intake component 703 is provided between the port of the delivery pipe 701 near the flow control nozzle 3 and the inner wall of the air distributor 4. An outer conical sleeve 704 is fitted over the air passage pipe 702. The length of the air passage pipe 702 is not greater than the length of the outer conical sleeve 704. There is a gap between the air guide pipe 8 and the upper connecting pipe 5. A second air intake component 705 is provided between the air passage pipe 702 and the outer conical sleeve 704. 05 is installed near the port of the conveying pipe 701 in the air passage pipe 702. Several first liquid passage holes 706 are opened on the side wall of the air passage pipe 702, and several second liquid passage holes 708 are opened on the side wall of the outer conical sleeve 704. The first liquid passage holes 706 and the second liquid passage holes 708 are all located on the same radius line on the end face of the air passage pipe 702. A connecting plate 707 connects the first liquid passage holes 706 and the second liquid passage holes 708 located on the same radius line. The first liquid passage holes 706, the second liquid passage holes 708 and the connecting plate 707 form a channel, and the air guide pipe 8 is connected to the outer conical sleeve 704.

[0040] Example 4 The present invention relates to a downhole gas-liquid vortex separation device, comprising the technical solution adopted herein, a downhole gas-liquid vortex separation device, including a cylindrical nozzle joint 1, the nozzle joint 1 being sequentially connected to a lower connecting pipe 2, a cylindrical gas distribution joint 4, an upper connecting pipe 5, and a cylindrical exhaust connection assembly 6; a conical flow control nozzle 3 is provided in both the nozzle joint 1 and the lower connecting pipe 2, the outer wall of the larger diameter port of the flow control nozzle 3 being fastened to the inner wall of the nozzle joint 1; an inverted conical gas-liquid separation assembly 7 is provided in both the gas distribution joint 4 and the upper connecting pipe 5, the port of the gas-liquid separation assembly 7 away from the gas distribution joint 4 being connected to a gas guide pipe 8, the gas guide pipe 8 being located within the upper connecting pipe 5 and the exhaust connection assembly 6.

[0041] The axis of nozzle connector 1 coincides with the axes of flow control nozzle 3, gas-liquid separation component 7 and air guide pipe 8, respectively.

[0042] The gas-liquid separation component 7 includes a cylindrical delivery pipe 701, which is connected to a conical air passage pipe 702. The delivery pipe 701 is connected to the large-diameter port of the air passage pipe 702. A first air intake component 703 is provided between the port of the delivery pipe 701 near the flow control nozzle 3 and the inner wall of the air distributor 4. An outer conical sleeve 704 is fitted over the air passage pipe 702. The length of the air passage pipe 702 is not greater than the length of the outer conical sleeve 704. There is a gap between the air guide pipe 8 and the upper connecting pipe 5. A second air intake component 705 is provided between the air passage pipe 702 and the outer conical sleeve 704. 05 is installed near the port of the conveying pipe 701 in the air passage pipe 702. Several first liquid passage holes 706 are opened on the side wall of the air passage pipe 702, and several second liquid passage holes 708 are opened on the side wall of the outer conical sleeve 704. The first liquid passage holes 706 and the second liquid passage holes 708 are all located on the same radius line on the end face of the air passage pipe 702. A connecting plate 707 connects the first liquid passage holes 706 and the second liquid passage holes 708 located on the same radius line. The first liquid passage holes 706, the second liquid passage holes 708 and the connecting plate 707 form a channel, and the air guide pipe 8 is connected to the outer conical sleeve 704.

[0043] The first air intake assembly 703 includes a first annular plate 7031, which is sleeved with a delivery pipe 701. The sidewall of the first annular plate 7031 has a plurality of first vent holes 7032 along the axial direction of the first annular plate 7031, and the sidewall of the first annular plate 7031 has a first annular groove 7033 along the circumferential direction of the first annular plate 7031. The second air intake assembly 705 includes a second annular plate 7051, which is sleeved with an air passage pipe 702. The sidewall of the second annular plate 7051 has a plurality of second vent holes 7052 along the axial direction of the second annular plate 7051, and the sidewall of the second annular plate 7051 has a second annular groove 7053 along the circumferential direction of the second annular plate 7051.

[0044] A plurality of first vent holes 7032 are arranged at equal intervals, and a plurality of second vent holes 7052 are arranged at equal intervals, with the first vent holes 7032 and the second vent holes 7052 being arranged opposite to each other.

[0045] Example 5 The present invention relates to a downhole gas-liquid vortex separation device, comprising the technical solution adopted herein, a downhole gas-liquid vortex separation device, including a cylindrical nozzle joint 1, the nozzle joint 1 being sequentially connected to a lower connecting pipe 2, a cylindrical gas distribution joint 4, an upper connecting pipe 5, and a cylindrical exhaust connection assembly 6; a conical flow control nozzle 3 is provided in both the nozzle joint 1 and the lower connecting pipe 2, the outer wall of the larger diameter port of the flow control nozzle 3 being fastened to the inner wall of the nozzle joint 1; an inverted conical gas-liquid separation assembly 7 is provided in both the gas distribution joint 4 and the upper connecting pipe 5, the port of the gas-liquid separation assembly 7 away from the gas distribution joint 4 being connected to a gas guide pipe 8, the gas guide pipe 8 being located within the upper connecting pipe 5 and the exhaust connection assembly 6.

[0046] The axis of nozzle connector 1 coincides with the axes of flow control nozzle 3, gas-liquid separation component 7 and air guide pipe 8, respectively.

[0047] The gas-liquid separation component 7 includes a cylindrical delivery pipe 701, which is connected to a conical air passage pipe 702. The delivery pipe 701 is connected to the large-diameter port of the air passage pipe 702. A first air intake component 703 is provided between the port of the delivery pipe 701 near the flow control nozzle 3 and the inner wall of the air distributor 4. An outer conical sleeve 704 is fitted over the air passage pipe 702. The length of the air passage pipe 702 is not greater than the length of the outer conical sleeve 704. There is a gap between the air guide pipe 8 and the upper connecting pipe 5. A second air intake component 705 is provided between the air passage pipe 702 and the outer conical sleeve 704. 05 is installed near the port of the conveying pipe 701 in the air passage pipe 702. Several first liquid passage holes 706 are opened on the side wall of the air passage pipe 702, and several second liquid passage holes 708 are opened on the side wall of the outer conical sleeve 704. The first liquid passage holes 706 and the second liquid passage holes 708 are all located on the same radius line on the end face of the air passage pipe 702. A connecting plate 707 connects the first liquid passage holes 706 and the second liquid passage holes 708 located on the same radius line. The first liquid passage holes 706, the second liquid passage holes 708 and the connecting plate 707 form a channel, and the air guide pipe 8 is connected to the outer conical sleeve 704.

[0048] The first air intake assembly 703 includes a first annular plate 7031, which is sleeved with a delivery pipe 701. The sidewall of the first annular plate 7031 has a plurality of first vent holes 7032 along the axial direction of the first annular plate 7031, and the sidewall of the first annular plate 7031 has a first annular groove 7033 along the circumferential direction of the first annular plate 7031. The second air intake assembly 705 includes a second annular plate 7051, which is sleeved with an air passage pipe 702. The sidewall of the second annular plate 7051 has a plurality of second vent holes 7052 along the axial direction of the second annular plate 7051, and the sidewall of the second annular plate 7051 has a second annular groove 7053 along the circumferential direction of the second annular plate 7051.

[0049] A plurality of first vent holes 7032 are arranged at equal intervals, and a plurality of second vent holes 7052 are arranged at equal intervals, with the first vent holes 7032 and the second vent holes 7052 being arranged opposite to each other.

[0050] A first rubber ring 7034 is fitted inside the first annular groove 7033, and the first rubber ring 7034 is in contact with the inner wall of the gas distributor 4. A second rubber ring 7054 is fitted inside the second annular groove 7053, and the second rubber ring 7054 is in contact with the inner wall of the upper connecting pipe 5.

[0051] The exhaust connection assembly 6 includes a solid connecting pipe 601, which is connected to the upper connecting pipe 5. Two oil supply pipes 602 are provided inside the connecting pipe 601, which are positioned opposite each other about the axis of the connecting pipe 601. Both oil supply pipes 602 are in contact with the inner wall of the connecting pipe 601. The two oil supply pipes 602 are provided with adapters 603 away from the ports of the air guide pipe 8. A space is formed between the center of the connecting pipe 601 and the two oil supply pipes 602. A steel ball 605 is provided in the space. The steel ball 605 is engaged with the port of the air guide pipe 8. An exhaust hole 604 is opened on the side wall of the connecting pipe 601, which is engaged with the steel ball 605.

[0052] Example 6 The present invention relates to a downhole gas-liquid vortex separation device, comprising the technical solution adopted herein, a downhole gas-liquid vortex separation device, including a cylindrical nozzle joint 1, the nozzle joint 1 being sequentially connected to a lower connecting pipe 2, a cylindrical gas distribution joint 4, an upper connecting pipe 5, and a cylindrical exhaust connection assembly 6; a conical flow control nozzle 3 is provided in both the nozzle joint 1 and the lower connecting pipe 2, the outer wall of the larger diameter port of the flow control nozzle 3 being fastened to the inner wall of the nozzle joint 1; an inverted conical gas-liquid separation assembly 7 is provided in both the gas distribution joint 4 and the upper connecting pipe 5, the port of the gas-liquid separation assembly 7 away from the gas distribution joint 4 being connected to a gas guide pipe 8, the gas guide pipe 8 being located within the upper connecting pipe 5 and the exhaust connection assembly 6.

[0053] The axis of nozzle connector 1 coincides with the axes of flow control nozzle 3, gas-liquid separation component 7 and air guide pipe 8, respectively.

[0054] The gas-liquid separation component 7 includes a cylindrical delivery pipe 701, which is connected to a conical air passage pipe 702. The delivery pipe 701 is connected to the large-diameter port of the air passage pipe 702. A first air intake component 703 is provided between the port of the delivery pipe 701 near the flow control nozzle 3 and the inner wall of the air distributor 4. An outer conical sleeve 704 is fitted over the air passage pipe 702. The length of the air passage pipe 702 is not greater than the length of the outer conical sleeve 704. There is a gap between the air guide pipe 8 and the upper connecting pipe 5. A second air intake component 705 is provided between the air passage pipe 702 and the outer conical sleeve 704. 05 is installed near the port of the conveying pipe 701 in the air passage pipe 702. Several first liquid passage holes 706 are opened on the side wall of the air passage pipe 702, and several second liquid passage holes 708 are opened on the side wall of the outer conical sleeve 704. The first liquid passage holes 706 and the second liquid passage holes 708 are all located on the same radius line on the end face of the air passage pipe 702. A connecting plate 707 connects the first liquid passage holes 706 and the second liquid passage holes 708 located on the same radius line. The first liquid passage holes 706, the second liquid passage holes 708 and the connecting plate 707 form a channel, and the air guide pipe 8 is connected to the outer conical sleeve 704.

[0055] The first air intake assembly 703 includes a first annular plate 7031, which is sleeved with a delivery pipe 701. The sidewall of the first annular plate 7031 has a plurality of first vent holes 7032 along the axial direction of the first annular plate 7031, and the sidewall of the first annular plate 7031 has a first annular groove 7033 along the circumferential direction of the first annular plate 7031. The second air intake assembly 705 includes a second annular plate 7051, which is sleeved with an air passage pipe 702. The sidewall of the second annular plate 7051 has a plurality of second vent holes 7052 along the axial direction of the second annular plate 7051, and the sidewall of the second annular plate 7051 has a second annular groove 7053 along the circumferential direction of the second annular plate 7051.

[0056] A plurality of first vent holes 7032 are arranged at equal intervals, and a plurality of second vent holes 7052 are arranged at equal intervals, with the first vent holes 7032 and the second vent holes 7052 being arranged opposite to each other.

[0057] A first rubber ring 7034 is fitted inside the first annular groove 7033, and the first rubber ring 7034 is in contact with the inner wall of the gas distributor 4. A second rubber ring 7054 is fitted inside the second annular groove 7053, and the second rubber ring 7054 is in contact with the inner wall of the upper connecting pipe 5.

[0058] The exhaust connection assembly 6 includes a solid connecting pipe 601, which is connected to the upper connecting pipe 5. Two oil supply pipes 602 are provided inside the connecting pipe 601, which are positioned opposite each other about the axis of the connecting pipe 601. Both oil supply pipes 602 are in contact with the inner wall of the connecting pipe 601. The two oil supply pipes 602 are provided with adapters 603 away from the ports of the air guide pipe 8. A space is formed between the center of the connecting pipe 601 and the two oil supply pipes 602. A steel ball 605 is provided in the space. The steel ball 605 is engaged with the port of the air guide pipe 8. An exhaust hole 604 is opened on the side wall of the connecting pipe 601, which is engaged with the steel ball 605.

[0059] The downhole gas-liquid vortex separation method, using a downhole gas-liquid vortex separator, specifically includes the following operating steps: Step 1: Deliver the gas-liquid mixture into nozzle connector 1; Step 2: The gas-liquid mixture forms an annular vortex at the flow control nozzle 3 and transports the gas separated from the gas-liquid mixture to the first air intake assembly 703, and the liquid to the delivery pipe 701; Step 3: After the liquid is delivered to the gas pipe 702, it flows through the second liquid passage hole 708 to the oil pipe 602 for collection. After the gas is delivered to the gas guide pipe 8, it is collected at the exhaust hole 604.

Claims

1. A downhole gas-liquid vortex separator, characterized in that, The nozzle connector (1) includes a cylindrical nozzle, which is connected in sequence to a lower connecting pipe (2), a cylindrical gas distributor (4), an upper connecting pipe (5), and a cylindrical exhaust connection assembly (6). The nozzle connector (1) and the lower connecting pipe (2) are provided with a conical flow control nozzle (3). The outer wall of the larger diameter port of the flow control nozzle (3) is fastened to the inner wall of the nozzle connector (1). The gas distributor (4) and the upper connecting pipe (5) are provided with an inverted conical gas-liquid separation assembly (7). The gas-liquid separation assembly (7) is connected to a guide pipe (8) at the port away from the gas distributor (4). The guide pipe (8) is located inside the upper connecting pipe (5) and the exhaust connection assembly (6).

2. The downhole gas-liquid vortex separator according to claim 1, characterized in that, The axis of the nozzle connector (1) coincides with the axis of the flow control nozzle (3), the gas-liquid separation component (7) and the air guide pipe (8), respectively.

3. The downhole gas-liquid vortex separator according to claim 2, characterized in that, The gas-liquid separation component (7) includes a cylindrical delivery pipe (701), which is connected to a conical air passage pipe (702). The delivery pipe (701) is connected to the large-diameter port of the air passage pipe (702). A first air intake component (703) is provided between the port of the delivery pipe (701) near the flow control nozzle (3) and the inner wall of the gas distributor (4). An outer conical sleeve (704) is fitted over the air passage pipe (702). The length of the air passage pipe (702) is not greater than the length of the outer conical sleeve (704). There is a gap between the air guide pipe (8) and the upper connecting pipe (5). A second air intake component (705) is provided between the air passage pipe (702) and the outer conical sleeve (704). The gas assembly (705) is installed near the port of the delivery pipe (701) on the gas pipe (702). The side wall of the gas pipe (702) is provided with a plurality of first liquid passage holes (706), and the side wall of the outer conical sleeve (704) is provided with a plurality of second liquid passage holes (708). The first liquid passage holes (706) and the second liquid passage holes (708) are both located on the same radius line on the end face of the gas pipe (702). A connecting plate (707) connects the first liquid passage holes (706) and the second liquid passage holes (708) located on the same radius line. The first liquid passage holes (706), the second liquid passage holes (708) and the connecting plate (707) form a channel. The gas guide pipe (8) is connected to the outer conical sleeve (704).

4. The downhole gas-liquid vortex separator according to claim 3, characterized in that, The first air intake assembly (703) includes a first annular plate (7031), which is sleeved with a delivery pipe (701). The sidewall of the first annular plate (7031) has a plurality of first vent holes (7032) along the axial direction of the first annular plate (7031), and the sidewall of the first annular plate (7031) has a first annular groove (7033) along the circumferential direction of the first annular plate (7031). The second air intake assembly (705) includes a second annular plate (7051), which is sleeved with an air pipe (702). The sidewall of the second annular plate (7051) has a plurality of second vent holes (7052) along the axial direction of the second annular plate (7051), and the sidewall of the second annular plate (7051) has a second annular groove (7053) along the circumferential direction of the second annular plate (7051).

5. The downhole gas-liquid vortex separator according to claim 4, characterized in that, A plurality of first vent holes (7032) are arranged at equal intervals, and a plurality of second vent holes (7052) are arranged at equal intervals, with the first vent holes (7032) and the second vent holes (7052) arranged opposite to each other.

6. The downhole gas-liquid vortex separator according to claim 5, characterized in that, A first rubber ring (7034) is fitted inside the first annular groove (7033), and the first rubber ring (7034) is in contact with the inner wall of the gas distributor (4). A second rubber ring (7054) is fitted inside the second annular groove (7053), and the second rubber ring (7054) is in contact with the inner wall of the upper connecting pipe (5).

7. The downhole gas-liquid vortex separator according to claim 5, characterized in that, The exhaust connection assembly (6) includes a solid connecting pipe (601), which is connected to the upper connecting pipe (5). The connecting pipe (601) has two oil supply pipes (602) positioned opposite each other about the axis of the connecting pipe (601). Both oil supply pipes (602) are in contact with the inner wall of the connecting pipe (601). The two oil supply pipes (602) have an adapter (603) at the port away from the air guide pipe (8). The center of the connecting pipe (601) and the two oil supply pipes (602) form a space. A steel ball (605) is provided in the space. The steel ball (605) cooperates with the port of the air guide pipe (8). An exhaust hole (604) is opened on the side wall of the connecting pipe (601). The exhaust hole (604) cooperates with the steel ball (605).

8. A downhole gas-liquid vortex separation method, using the downhole gas-liquid vortex separation device according to claim 7, specifically includes the following operating steps: Step 1: Deliver the gas-liquid mixture into the nozzle connector (1); Step 2: The gas-liquid mixture forms an annular vortex at the flow control nozzle (3) and transports the gas separated from the gas-liquid mixture to the first air intake assembly (703), and the liquid to the delivery pipe (701); Step 3: After the liquid is delivered to the gas pipe (702), it flows through the second liquid hole (708) to the oil pipe (602) for collection. After the gas is delivered to the gas guide pipe (8), it is collected at the exhaust hole (604).

Images