Underground axis jet flow reinforced oil-gas-water three-phase separation device for gas recovery well

Abstract

The invention relates to a gas recovery downhole axis jet reinforced oil-gas-water three-phase separation device which comprises a degassing structure and an oil-water separation structure, the oil-water separation structure is arranged in the middle in the axial direction, the degassing structure surrounds the oil-water separation structure, and gas-containing mixed liquid firstly enters the degassing structure to be degassed and then enters the oil-water separation structure; the degassed oil-water mixed liquid enters an oil-water separation structure for oil-water separation; the degassing structure comprises a shell formed by sequentially connecting an upper sleeve, a bridge type channel, a middle sleeve, a connector and a lower sleeve, a gas chamber is arranged in the middle sleeve, the gas chamber is in threaded connection with a connector of a gas separation cavity, the gas separation cavity is located in a three-phase mixing cavity, and the three-phase mixing cavity is connected with a settling bin; an ascending channel is arranged on the inner wall of the lower sleeve, the ascending channel, the three-phase mixing cavity, the gas separation cavity, the gas chamber and the middle sleeve are sequentially communicated, the middle sleeve is communicated with the upper sleeve through a bridge type channel, and the upper sleeve is provided with a gas outlet. According to the invention, oil-water separation is carried out after gas phase separation, so that the service life of equipment is prolonged, and the exploitation cost is reduced.

Description

Technical Field

[0001] The present invention relates to a device which can realize the efficient separation of oil, water and gas three-phase media in a small underground space for the special working condition of oil-containing gas wells, recover the gas phase and oil phase, and complete the water reinjection at the same time. Specifically, it relates to an axial jet enhanced oil, gas and water three-phase separation device in a gas well. Background Art

[0002] As the exploitation of natural gas wells continues to deepen, the exploitation situation becomes more and more complicated, and the cost of extraction becomes higher. At present, many areas in my country have gas wells containing oil. The oil-water mixture in the gas wells will hinder the transportation of natural gas, thereby affecting the efficiency of natural gas extraction; in addition, after the gas-liquid separation, another device is required to separate the oil-water mixture, thereby increasing the cost of extraction and reducing the economic benefits; therefore, the special working condition of gas wells containing oil has higher requirements for the extraction equipment.

[0003] In response to the above problems, technicians have proposed some solutions. For example, Patent Document 1, CN202321884837.8, is to separate the oil, water and gas three-phases after the gas-containing mixed liquid is produced. It is impossible to achieve three-phase separation underground, and the structure is complex and the operating cost is high; For example, Patent Document 2, CN201610045581.X, can perform gas-liquid separation underground, but cannot perform oil-water separation at the same time. Oil-water separation also depends on other equipment, and oil, water and gas three-phase separation cannot be performed in the same device structure; For example, Patent Document 3, CN202411028596.6, the gas phase is not separated in advance, and the harm of the gas phase to the equipment still exists. Summary of the invention

[0004] The purpose of the present invention is to provide an axial jet enhanced oil, gas and water three-phase separation device for a gas well. This axial jet enhanced oil, gas and water three-phase separation device for a gas well is used to solve the problem that the separation devices in the prior art cannot perform oil, water and gas three-phase separation in the same device structure or the unseparated gas-containing mixed liquid causes harm to equipment and pipelines.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: the axial jet enhanced oil-gas-water three-phase separation device for gas production wells comprises a degassing structure and an oil-water separation structure, the oil-water separation structure is centrally arranged along the axial direction, the degassing structure surrounds the oil-water separation structure, the gas-containing mixed liquid first enters the degassing structure for degassing, and the degassed oil-water mixed liquid enters the oil-water separation structure for oil-water separation; the degassing structure comprises a shell composed of an upper sleeve, a bridge channel, a middle sleeve, a connection, and a lower sleeve connected in sequence, the air chamber is arranged in the middle sleeve, the lower port of the air chamber is threadedly connected to the joint of the gas separation chamber, and the gas separation chamber is located in the three-phase mixing The gas separation chamber is threadedly connected to the upper port of the three-phase mixing chamber through its joint, and the lower end of the three-phase mixing chamber is threadedly connected to the sedimentation bin of the oil-water separation structure; the gas separation chamber is a cylinder, the upper end of the cylinder is a joint, the middle outer wall is provided with a spiral channel, the lower part of the cylinder is provided with a plurality of vents, and the lower end of the cylinder has an inner folding plate structure; the lower sleeve is provided with an initial inlet of the mixed phase, the inner wall of the lower sleeve is an annular ascending channel, the ascending channel is communicated with the three-phase mixing chamber, the three-phase mixing chamber is communicated with the gas separation chamber, the gas separation chamber is communicated with the air chamber, the air chamber is communicated with the middle sleeve, the middle sleeve is communicated with the upper sleeve through a bridge channel, and the upper sleeve is provided with an air outlet; The oil-water separation structure includes an overflow pipe extension pipe, a water chamber, an underflow pipe, an overflow pipe, an oil-water separation cyclone channel, a sedimentation chamber, and a screw pump. The connector of the overflow pipe extension pipe sits on the upper port of the water chamber. The water chamber is arranged in the bridge channel. The lower end of the water chamber is threadedly connected to the connector of the underflow pipe. The lower end of the overflow pipe extension pipe is threadedly connected to the overflow pipe. The overflow pipe, the oil-water separation cyclone channel, the reducer, and the screw pump are connected in sequence. The overflow pipe and the oil-water separation cyclone channel are located in the underflow pipe. The connector of the underflow pipe sits on the upper port of the gas chamber. The underflow pipe extends downward into the gas separation cavity. The lower port of the underflow pipe is threadedly connected to the reducer. The sedimentation chamber surrounds the upper part of the screw pump.

[0006] In the above scheme, the bridge channel has a gas phase outlet in the axial direction and a water phase outlet in the radial direction, and its upper end is connected to the upper sleeve by threads, and its lower end is connected to the middle sleeve by threads.

[0007] In the above scheme, the air chamber is a cylinder with uniform air outlet holes, the upper end of the air chamber is connected to the bottom flow pipe through threads, and the lower end of the air chamber is connected to the gas separation chamber through threads.

[0008] In the above scheme, the three-phase mixing chamber is a cylinder, with threads at both ends, threads on the inner wall of the middle section, and a mixed phase inlet near the upper port.

[0009] In the above scheme, a threaded structure is arranged at the lower end of the upper sleeve and is connected to the bridge channel through a thread; threaded structures are arranged at the upper and lower ends of the middle sleeve, the upper end is connected to the bridge channel through a thread, and the lower end is connected to the connection through a thread; threads are arranged at the upper and lower ends of the connection, the upper end is connected to the middle sleeve through a thread, and the lower end is connected to the lower sleeve through a thread; the upper end of the lower sleeve is connected to the connection through a thread, and an initial inlet for the mixed phase is opened at the lower end.

[0010] In the above scheme, threads are arranged at the upper and lower ends of the water chamber, and uniform water outlets are opened. The upper end is connected to the overflow pipe extension pipe by threads, and the lower end is connected to the underflow pipe by threads.

[0011] In the above scheme, the underflow pipe connector is provided with two sections of threads, and a section of threads is provided at the lower end of the underflow pipe. The underflow pipe connector is connected to the water chamber and the air chamber threads respectively through the two sections of threads, and the threads at the lower end of the underflow pipe are connected to the reducer thread.

[0012] In the above scheme, threads are arranged at the upper and lower ends of the overflow pipe, the lower end of the overflow pipe is connected to the oil-water separation cyclone channel by threads, and the lower end of the overflow pipe is evenly arranged with oil phase inlets along the circumference, and the oil phase inlets are strip-shaped openings.

[0013] In the above scheme, the upper end of the oil-water separation cyclone channel is a spiral flow channel, and below the spiral flow channel is a reducing pipe. The reducing pipe has vertical oil-water mixed liquid outlets evenly opened along the circumference. The lower end of the reducing pipe is connected to an annular disk, and below the annular disk is a joint, which is connected to the reducer by threads; the spiral flow channel has a center hole, and the upper end of the center hole has an internal thread, which is connected to the overflow pipe by threads.

[0014] In the above scheme, the sedimentation bin includes an upper sedimentation bin and a lower sedimentation bin. A thread is set at the lower end of the upper sedimentation bin, the upper end of the upper sedimentation bin is tightly attached to the screw pump, and the lower end is connected to the screw pump by a thread; threads are set at the upper and lower ends of the lower sedimentation bin, the upper end is connected to the three-phase mixing chamber by a thread, the lower end is connected to the screw pump by a thread, and the internal cone is set with a thread and connected to the screw pump by a thread.

[0015] The present invention has the following beneficial effects: 1. The present invention enables the gas-containing mixed medium to achieve gas-liquid separation and oil-water separation while occupying a small space. After separation, the gas phase is collected upward along the pipeline. After oil-water separation, the separated oil phase is collected and the water phase is injected back into the formation. The gas phase is separated to increase the service life of other operating equipment and improve the stability of operation. Subsequently, water is injected back to reduce the energy consumption of the lifting process.

[0016] 2. The present invention is provided with a gas separation chamber, and two gas-liquid separations are performed before oil-water separation. After the gas-containing mixed liquid flows out from the spiral flow channel, the gas phase enters the gas separation chamber from the vent hole on the lower end wall of the gas separation chamber, completing the first gas-liquid separation; then the gas-containing mixed liquid continues to flow downward, and the gas and liquid phases are separated in the sedimentation bin, the mixed liquid is deposited below, and the gas phase is located above the liquid surface and enters the gas separation chamber from the gap between the inner folding plate structure and the screw pump.

[0017] 3. After gas-liquid separation, the present invention arranges an axially enhanced oil-water separation, drives the oil-water separation by a screw pump at the axial center of the device, and lifts the separated oil phase, thus solving the problem of insufficient power for oil-water separation.

[0018] 4. The gas separation chamber and the oil-water separation chamber of the present invention do not interfere with each other, and the oil-water separation is performed after the gas phase is separated, thereby avoiding the interference of the gas phase with the oil-water separation process and improving the separation efficiency of the device.

[0019] 5. The present invention innovatively proposes a co-directional oil-water separation structure. Based on a full understanding of the oil-water separation cyclone field, an oil-water separator is designed that collects the oil phase in the center of the oil-water separator and the water phase in the outer layer. This oil-water separator can well adapt to the complex working conditions faced by downhole separation.

[0020] 6. The present invention can be connected to a small space in the wellbore to achieve three-phase separation without interfering with each other, thereby achieving the purpose of collecting the gas phase and the oil phase and discharging the water phase. The cyclone device involved is arranged internally in a very small space, achieving efficient separation, which not only improves the oil-water separation efficiency and stability, but also extends the service life of the equipment and reduces the mining cost.

[0021] 7. The present invention can separate the three phases of oil, water and gas in a small space underground, and can separate and collect the gas phase in advance, thus avoiding the influence of the gas phase on the oil-water separation process and the corrosion of the oil-water separation structure by the gas phase, ensuring the stability of the oil-water separation process and improving the efficiency of oil-water separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 (a) is the overall appearance diagram of the present invention; Figure 1 (b) is a cross-sectional view of the present invention.

[0023] Figure 2 (a) is a cross-sectional view of the degassing structure; Figure 2 (b) is the appearance diagram of the bridge channel.

[0024] Figure 2 (c) is the appearance of the gas separation chamber.

[0025] Figure 3This is an exploded diagram of the degassing structure.

[0026] Figure 4 (a) is a cross-sectional view of the oil-water separation structure.

[0027] Figure 4 (b) is the appearance of the overflow pipe.

[0028] Figure 4 (c) is the appearance of the oil-water separation cyclone channel.

[0029] Figure 5 This is an exploded diagram of the oil-water separation structure.

[0030] Figure 6 (a) is a cross-sectional view of the sedimentation chamber.

[0031] Figure 6 (b) is a cross-sectional view of the upper sedimentation chamber.

[0032] Figure 6 (c) is a cross-sectional view of the sinking chamber.

[0033] In the figure, 101-upper sleeve, 102-bridge channel, 1021-gas phase outlet, 1022-water phase outlet, 103-middle sleeve, 104-connection, 105-lower sleeve, 1051-mixed phase initial inlet, 106-gas chamber, 1061-gas outlet, 107-three-phase mixing chamber, 1071-mixed phase inlet, 108-gas separation chamber, 1081-external spiral flow channel, 1082-vent, 1083-inner folded plate structure , 201-upper oil pipe coupling, 202-overflow pipe extension pipe, 203-water chamber, 2031-water outlet, 204-bottom flow pipe, 205-overflow pipe, 2051-oil phase inlet, 206-oil-water separation vortex channel, 2061-oil-water mixed liquid outlet, 2062-inner spiral flow channel, 207-diameter changer, 208-upper sedimentation chamber, 209-lower sedimentation chamber, 210-screw pump, 2101-liquid inlet, 211-lower oil pipe coupling. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings: like Figure 1-Figure 6As shown, this axial jet enhanced oil-gas-water three-phase separation device for gas production wells includes a degassing structure and an oil-water separation structure. The oil-water separation structure is centrally arranged along the axial direction, and the degassing structure surrounds the oil-water separation structure. The gas-containing mixed liquid first enters the degassing structure for degassing, and the degassed oil-water mixed liquid enters the oil-water separation structure for oil-water separation; the degassing structure includes a shell composed of an upper sleeve 101, a bridge channel 102, a middle sleeve 103, a connection 104, and a lower sleeve 105 connected in sequence, an air chamber 106 is arranged in the middle sleeve 103, and the lower port of the air chamber is threadedly connected to the joint of the gas separation chamber 108, the gas separation chamber 108 is located in the three-phase mixing chamber 107 and is threadedly connected to the upper port of the three-phase mixing chamber through its joint, and the three-phase mixing The lower end of the chamber is threadedly connected to the sedimentation bin of the oil-water separation structure; the gas separation chamber 108 is a cylinder, the upper end of the cylinder is a joint, the middle outer wall is provided with a spiral channel, the lower part of the cylinder is provided with a plurality of vents 1082, and the lower port of the cylinder has an inner folded plate structure; the lower sleeve 105 is provided with an initial inlet 1051 for the mixed phase, the inner wall of the lower sleeve is an annular ascending channel, the upper end of the ascending channel is closed by a connection 104, the ascending channel is communicated with the three-phase mixing chamber 107, the three-phase mixing chamber 107 is communicated with the gas separation chamber 108, the gas separation chamber 108 is communicated with the air chamber 106, the air chamber 106 is communicated with the middle sleeve 103, the middle sleeve 103 is communicated with the upper sleeve 101 through the bridge channel 102, and the upper sleeve 101 is provided with an outlet.

[0035] The oil-water separation structure includes an overflow pipe extension pipe 202, a water chamber 203, an underflow pipe 204, an overflow pipe 205, an oil-water separation cyclone channel 206, a sedimentation chamber, and a screw pump 210. The connector of the overflow pipe extension pipe 202 is located at the upper end of the water chamber. The water chamber 203 is arranged in the bridge channel 102. The lower end of the water chamber 203 is threadedly connected to the connector of the underflow pipe 204. The lower end of the overflow pipe extension pipe 202 is threadedly connected to the overflow pipe 205. The overflow pipe 205, the oil-water separation cyclone channel 206, the reducer 207, and the screw pump 210 are connected in sequence. The overflow pipe 205 and the oil-water separation cyclone channel 206 are located in the underflow pipe. The connector of the underflow pipe 204 is located at the upper end of the gas chamber. The underflow pipe 204 extends downward into the gas separation chamber 108. The lower end of the underflow pipe 204 is threadedly connected to the reducer 207. The sedimentation chamber surrounds the upper part of the screw pump.

[0036] The details are as follows: The connection relationship between the various components of the degassing structure and the functions of each component are as follows: The degassing structure includes an upper sleeve 101, a bridge channel 102, a middle sleeve 103, a connection 104, a lower sleeve 105, an air chamber 106, a three-phase mixing chamber 107, and a gas separation chamber 108. The lower end of the upper sleeve 101 is provided with a threaded structure and is connected to the bridge channel 102 by threads; the bridge channel 102 is provided with a gas phase outlet 1021 in the axial direction and a water phase outlet 1022 in the radial direction, and threaded structures are provided at the upper and lower ends, the upper end is connected to the upper sleeve 101 by threads, and the lower end is connected to the middle sleeve 103 by threads; the middle sleeve 103 is provided with threaded structures at the upper and lower ends, the upper end is connected to the bridge channel 102 by threads, and the lower end is connected to the middle sleeve 103 by threads. It is connected to the connection 104 by threads; the connection 104 is provided with threads at the upper and lower ends, the upper end is connected to the middle sleeve 103 by threads, and the lower end is connected to the lower sleeve 105 by threads; the upper end of the lower sleeve 105 is connected to the connection 104 by threads, and the lower end is provided with a mixed phase initial inlet 1051; the air chamber 106 is provided with uniform gas outlet holes 1061, and the upper and lower ends are provided with threaded structures, the upper end is connected to the bottom flow pipe 204 by threads, and the lower end is connected to the gas separation chamber 108 by threads; the three-phase mixing chamber 107 is provided with threads at the upper and lower ends, the middle section is provided with threads, and a mixed phase inlet 1071 is provided near the upper end; the upper end is connected to the gas separation chamber 1 08 is connected by threads, and the lower end is connected to the lower sedimentation chamber 209 by threads; an outer spiral flow channel 1081 is added to the outside of the gas separation chamber 108, and evenly distributed vents 1082 are opened at the lower end, and an inner folding plate structure 1083 is added to the tail, and the upper end is connected to the gas chamber 106 by threads; when working, the gas-containing mixed liquid enters the device from the initial mixed phase inlet 1051, and the gas-containing mixed liquid is continuously accumulated to the mixed phase inlet 1071, and then the gas-containing mixed liquid enters the three-phase mixing chamber 107 from the mixed phase inlet 1071, and the gas-containing mixed liquid flows out along the outer spiral flow channel 1081. After centrifugal acceleration, the gas phase with a smaller density is in the inner layer. The gas phase gathers inward, and the liquid phase with higher density is in the outer layer. The gas phase that gathers inward enters the gas separation chamber 108 in advance through the vent hole 1082 on the gas separation chamber 108. The remaining gas enters the gas separation chamber 108 again when the mixed liquid drops below the inner folding plate structure 1083. After the gas phase enters the gas separation chamber 108, it goes upward along the gas separation chamber 108 into the gas chamber 106, and then is discharged from the gas outlet 1061. The gas phase is discharged into the middle sleeve 103, and then the gas phase enters the upper sleeve 101 from the gas phase outlet 1021 on the bridge channel 102. The upper sleeve 101 is connected to the pipeline to collect the gas phase to complete the gas-liquid separation. The connection relationship between the various components of the oil-water separation structure and the functions of each component are as follows: The oil-water separation structure includes an upper oil pipe coupling 201, an overflow pipe extension pipe 202, a water chamber 203, an underflow pipe 204, an overflow pipe 205, an oil-water separation swirl channel 206, a reducer 207, an upper settling chamber 208, a lower settling chamber 209, a screw pump 210, and a lower oil pipe coupling 211. The upper oil pipe coupling 201 is connected to the overflow pipe extension pipe 202 by threads; the overflow pipe extension pipe 202 is provided with threads at both the upper and lower ends, the upper end is connected to the upper oil pipe coupling 201 by threads, and the lower end is connected to the overflow pipe 205 by threads; the water chamber 203 is provided with threads at both the upper and lower ends, and has a uniform water outlet 2031, the upper end is connected to the overflow pipe extension pipe 202 by threads, and the lower end is connected to the underflow pipe 204 by threads; the underflow pipe 204 is provided with threads at both the upper and lower ends , two sections of threads are set at the upper end, and one section of threads are set at the lower end. The upper end is respectively connected to the water chamber 203 and the air chamber 106 by threads, and the lower end is connected to the reducer 207 by threads; the overflow pipe 205 is threaded at the upper and lower ends, the upper end is connected to the overflow pipe extension pipe 202 by threads, and the lower end is connected to the oil-water separation cyclone channel 206 by threads, and a uniform oil phase inlet 2051 is opened; the oil-water separation cyclone channel 206 is threaded at the upper and lower ends, the upper end is connected to the overflow pipe 205 by threads, and the lower end is connected to the reducer 207 by threads, and a uniform oil-water mixture outlet 2061 is opened at the lower end inlet, and a uniform inner spiral flow channel 2062 is set at the upper part; reducer 207, threads are set at the upper and lower ends, and the upper end is connected to the oil-water separation cyclone channel 206 The lower end of the upper sedimentation chamber 208 is connected by threads, and the lower end is connected to the screw pump 210 by threads; the lower end of the upper sedimentation chamber 208 is provided with threads, the upper end is closely attached to the screw pump 210, and the lower end is connected to the screw pump 210 by threads; the upper and lower ends of the lower sedimentation chamber 209 are provided with threads, the upper end is connected to the three-phase mixing chamber 107 by threads, the lower end is connected to the screw pump 210 by threads, and the internal cone is provided with threads and connected to the screw pump 210 by threads; the screw pump 210 is provided with multiple threads, and threads are provided at the top to connect with the reducer 207, which is connected to the upper sedimentation chamber 208 by threads, and is connected to the lower sedimentation chamber 209 by threads; a uniform liquid inlet hole 2101 is opened at the lower end of the screw; the lower oil pipe coupling 211 is connected to the bottom end of the screw pump by threads; after the gas phase is separated, the oil-water mixture is settled in the lower sedimentation chamber. The oil and water mixture is gathered at the bin 209 and then sucked into the liquid inlet 2101 by the screw pump 210. The screw pump 210 transports the oil-water mixture upward, and the oil-water mixture flows out from the oil-water mixture outlet 2061 of the oil-water separation vortex channel 206 through the reducer 207, and passes through the inner spiral flow channel 2062. After flowing out from the inner spiral flow channel 2062, the oil phase with smaller density is in the inner layer and gathers inward, and the water phase with larger density is in the outer layer and moves outward. Finally, the oil phase enters the overflow pipe 205 from the oil phase inlet 2051 and flows out along the overflow pipe extension pipe 202 to the upper oil pipe coupling 201. The water phase goes up along the bottom flow pipe 204 to the water chamber 203, and is discharged from the water outlet 2031 of the water chamber 203 through the radial water phase outlet 1022 of the bridge channel 202.

[0037] like Figure 1 As shown, the present invention is vertically placed in the downhole pipeline. When working, the gas-containing oil-water mixture enters the device from the initial mixed phase inlet 1051, then enters from the mixed phase inlet 1071, passes through the outer spiral flow channel 1081, and reaches the vent hole 1082. The gas phase enters the gas separation chamber 108 in advance, and the remaining gas enters the gas separation chamber 108 from the gap between the inner folding plate structure 1083 and the reducer 207. The gas phase goes up along the separation chamber to the gas chamber 106, and then is discharged from the gas outlet 1061. The gas phase is discharged into the middle sleeve 103, and then the gas phase is discharged from the bridge channel 102 The gas phase outlet 1021 on the upper sleeve 101 enters the upper sleeve 101, and the upper sleeve 101 is connected to the pipeline to collect the gas phase, completing the separation and collection of the gas phase; at the same time, the oil-water mixture continues to sink to the sinking bin 209 to gather, and enters the screw pump 210 from the liquid inlet 2101. The screw pump 210 lifts the oil-water mixture, and the oil-water mixture flows out from the oil-water mixture outlet 2061 through the reducer 207, and passes through the inner spiral flow channel 2062. The oil phase enters the overflow pipe 205 from the oil phase inlet 2051, and flows out along the overflow pipe extension pipe 202 to the upper oil pipe coupling 201, completing the collection of the oil phase. The water phase goes up along the bottom flow pipe 204 to the water chamber 203, and is discharged from the water outlet 2031 of the water chamber 203 through the radial water phase outlet 1022 of the bridge channel 102, completing the reinjection of the water phase. The cross-sectional view of the degassing structure, the appearance view of the bridge channel, and the appearance view of the gas separation chamber are shown in Figure 2 As shown in (a), (b), and (c), the gas-containing oil-water mixture enters the device from the initial mixed phase inlet 1051. When the incoming liquid accumulates to a certain height, the gas-containing oil-water mixture enters from the mixed phase inlet 1071, passes through the outer spiral flow channel 1081, and after centrifugal acceleration, the gas phase with a smaller density is in the inner layer and gathers inward, and the liquid phase with a larger density is in the outer layer. The gas phase that gathers inward enters the gas separation chamber (108) in advance through the vent hole 1082 on the gas separation chamber 108, and the rest When the gas to be mixed liquid drops below the inner folding plate structure 1083, it enters the gas separation chamber 108 again from the gap between the inner folding plate structure 1083 and the reducer 207. The gas phase goes up along the separation chamber to the gas chamber 106, and then is discharged from the gas outlet 1061. The gas phase is discharged into the middle sleeve 103, and then the gas phase enters the upper sleeve 101 from the gas phase outlet 1021 on the bridge channel 102. The upper sleeve 101 is connected to the pipeline to collect the gas phase, completing the separation and collection of the gas phase. The degassing structure explosion diagram is shown in FIG. Figure 3 The oil-water separation structure cross-sectional view, overflow pipe appearance view and oil-water separation spiral flow channel appearance view are shown in Figure 4As shown in (a), (b), and (c), after the gas-liquid separation, the oil-water mixture continues to sink to the sinking bin 209 and gathers, and enters the screw pump 210 from the oil-water mixture inlet 2101. The screw pump 210 lifts the oil-water mixture, and the oil-water mixture flows out from the oil-water mixture outlet 2061 through the reducer 207. Through the inner spiral flow channel 2062, the axial velocity of the oil-water mixture is converted into a tangential velocity, and the oil phase with lower density gathers inward, and the water phase with higher density moves outward. Finally, the oil phase enters the overflow pipe 205 from the oil phase inlet 2051, and flows out along the overflow pipe extension pipe 202 to the upper oil pipe coupling 201, completing the collection of the oil phase. The water phase goes up along the bottom flow pipe 204 to the water chamber 203, and is discharged from the water outlet 2031 of the water chamber 203 through the radial water phase outlet 1022 of the bridge channel 102, completing the reinjection of the water phase. The exploded diagram of the oil-water separation structure is shown in Figure 5 The cross-sectional view of the sedimentation bin, the cross-sectional view of the upper sedimentation bin and the cross-sectional view of the lower sedimentation bin are shown in Figure 6 As shown in (a), (b) and (c), the upper sedimentation chamber 208 and the lower sedimentation chamber 209 together constitute a sedimentation chamber. After the gas-liquid separation, the oil-water mixture continues to settle downward, gathers between the lower sedimentation chamber 209 and the screw pump 210, and then enters the screw pump from the liquid inlet hole 2101 on the screw pump 210.

[0038] The overall structure of the present invention is simple and highly applicable to special working conditions of gas wells containing oil. The device utilizes cyclone separation technology to achieve efficient separation of the three-phase medium of oil, water and gas in a small space underground, collect the gas phase and oil phase, and reinject the water phase. Through the innovative structural layout, the various media after separation are reasonably processed, which greatly improves the recovery rate and enhances the economy of the production system.

Claims

1. An axial jet enhanced oil-gas-water three-phase separation device for gas wells, characterized in that: The axial jet enhanced oil-gas-water three-phase separation device for a gas well comprises a degassing structure and an oil-water separation structure. The oil-water separation structure is centrally arranged along the axial direction, and the degassing structure surrounds the oil-water separation structure. The gas-containing mixed liquid first enters the degassing structure for degassing, and the degassed oil-water mixed liquid enters the oil-water separation structure for oil-water separation. The degassing structure comprises a shell composed of an upper sleeve, a bridge channel, a middle sleeve, a connection, and a lower sleeve connected in sequence. The air chamber is arranged in the middle sleeve, and the lower port of the air chamber is threadedly connected to the joint of the gas separation chamber. The gas separation chamber is located in the three-phase mixing chamber and is connected to the three-phase mixing chamber through its joint. The upper port of the phase mixing chamber is threadedly connected, and the lower end of the three-phase mixing chamber is threadedly connected to the sedimentation bin of the oil-water separation structure; the gas separation chamber is a cylinder, the upper end of the cylinder is a joint, the middle outer wall is provided with a spiral channel, the lower part of the cylinder is provided with a plurality of vents, and the lower port of the cylinder has an inner folding plate structure; the lower cylinder sleeve is provided with an initial inlet of the mixed phase, the inner wall of the lower sleeve is an annular ascending channel, the ascending channel is communicated with the three-phase mixing chamber, the three-phase mixing chamber is communicated with the gas separation chamber, the gas separation chamber is communicated with the air chamber, the air chamber is communicated with the middle sleeve, the middle sleeve is communicated with the upper sleeve through a bridge channel, and the upper sleeve is provided with an air outlet; The oil-water separation structure includes an overflow pipe extension pipe, a water chamber, an underflow pipe, an overflow pipe, an oil-water separation cyclone channel, a sedimentation chamber, and a screw pump. The connector of the overflow pipe extension pipe sits on the upper port of the water chamber. The water chamber is arranged in the bridge channel. The lower end of the water chamber is threadedly connected to the connector of the underflow pipe. The lower end of the overflow pipe extension pipe is threadedly connected to the overflow pipe. The overflow pipe, the oil-water separation cyclone channel, the reducer, and the screw pump are connected in sequence. The overflow pipe and the oil-water separation cyclone channel are located in the underflow pipe. The connector of the underflow pipe sits on the upper port of the gas chamber. The underflow pipe extends downward into the gas separation cavity. The lower port of the underflow pipe is threadedly connected to the reducer. The sedimentation chamber surrounds the upper part of the screw pump.

2. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 1 is characterized in that: The bridge channel is provided with a gas phase outlet in the axial direction and a water phase outlet in the radial direction, and its upper end is connected to the upper sleeve through a thread, and its lower end is connected to the middle sleeve through a thread.

3. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 2 is characterized in that: The air chamber is a cylinder with uniform air outlet holes, the upper end of the air chamber is connected to the bottom flow pipe through threads, and the lower end of the air chamber is connected to the gas separation chamber through threads.

4. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 3 is characterized in that: The three-phase mixing chamber is a cylinder, with threads arranged at both the upper and lower ends, threads arranged on the inner wall of the middle section, and a mixed phase inlet arranged near the upper port.

5. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 4 is characterized in that: A threaded structure is arranged at the lower end of the upper sleeve and is connected to the bridge channel through a thread; threaded structures are arranged at the upper and lower ends of the middle sleeve, the upper end is connected to the bridge channel through a thread, and the lower end is connected to the connection through a thread; threads are arranged at the upper and lower ends of the connection, the upper end is connected to the middle sleeve through a thread, and the lower end is connected to the lower sleeve through a thread; the upper end of the lower sleeve is connected to the connection through a thread, and an initial inlet for the mixed phase is opened at the lower end.

6. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 5 is characterized in that: The upper and lower ends of the water chamber are both provided with threads and are provided with uniform water outlets. The upper end is connected with the overflow pipe extension pipe through threads, and the lower end is connected with the underflow pipe through threads.

7. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 6 is characterized in that: The underflow pipe connector is provided with two sections of threads, and a section of threads is provided at the lower end of the underflow pipe. The underflow pipe connector is threadedly connected to the water chamber and the air chamber through the two sections of threads, and the thread at the lower end of the underflow pipe is connected to the reducer thread.

8. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 7 is characterized in that: The upper and lower ends of the overflow pipe are both provided with threads, the lower end of the overflow pipe is connected to the oil-water separation cyclone channel through threads, and the lower end of the overflow pipe is evenly provided with oil phase inlets along the circumference, and the oil phase inlets are strip-shaped openings.

9. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 8, characterized in that: The upper end of the oil-water separation cyclone channel is a spiral flow channel, and below the spiral flow channel is a reducing pipe. The reducing pipe has vertical oil-water mixed liquid outlets evenly opened along the circumference. The lower end of the reducing pipe is connected to an annular disk, and below the annular disk is a joint, which is connected to the reducer by threads; the spiral flow channel has a center hole, and the upper end of the center hole has an internal thread, which is connected to the overflow pipe by threads.

10. The axial jet enhanced oil-gas-water three-phase separation device for gas wells according to claim 9, characterized in that: The sedimentation bin comprises an upper sedimentation bin and a lower sedimentation bin. A thread is arranged at the lower end of the upper sedimentation bin. The upper end of the upper sedimentation bin is in close contact with the screw pump, and the lower end is connected to the screw pump by a thread. Threads are arranged at the upper and lower ends of the lower sedimentation bin. The upper end is connected to the three-phase mixing chamber by a thread, and the lower end is connected to the screw pump by a thread. A thread is arranged at the internal cone and is connected to the screw pump by a thread.

Images