Applicable to the downhole oil-gas-water three-phase efficient separation device for ultra-high liquid production oil wells

Abstract

The present invention relates to an oil-gas-water three-phase efficient separation device suitable for an ultra-high liquid production oil well. It includes a combined shell and a multi-stage separation structure. The upper end of the combined shell is connected to an upper connection, the lower end of the combined shell is connected to a lower connection, and the lower end of the lower connection is connected to a bridge channel. The multi-stage separation structure is arranged in the combined shell. An oil discharge channel, an exhaust channel, and a drainage channel are arranged in the wall of the combined shell. The multi-stage separation structure is composed of various separation structures connected in series from top to bottom in the combined shell; each separation structure has a graded shell and a graded three-phase separator group. The graded three-phase separator group includes a plurality of parallel three-phase separators, an oil phase deposition plate, a degassing combined plate, a gas-liquid separation cylinder, a combined orifice plate, and an underflow cover. The degassing combined plate is composed of an upper plate and a lower plate arranged on the outer edge of a central column. The present invention applies a multi-stage series-connected single-stage parallel cyclone separator to an offshore oil field. The three-stage separation structure works independently, which greatly improves the separation efficiency.

Description

Technical Field

[0001] The present invention relates to a device capable of efficiently treating a large displacement of oil-water mixture on an offshore platform to efficiently separate oil, water and gas three-phase media, and in particular to a downhole oil-gas-water three-phase efficient separation device suitable for ultra-high liquid production oil wells. Background Art

[0002] With the development of the global economy and the growth of population, the demand for energy continues to increase. As the main energy resources, oil and natural gas play a vital role in meeting energy demand. Since the exploitation of terrestrial oil fields has been relatively saturated, offshore oil fields have become an important supplementary source, and offshore oil field exploitation technology has been continuously improved, including drilling equipment, submarine pipelines, oil field development engineering and other aspects of the technology have been greatly improved and developed, and offshore oil fields have great resource potential and are of great value to future energy supply. For the treatment of produced fluids, Chinese patent document CN201910245011.9, the pipeline oil, gas and water separation system completely adopts pipeline separation technology, and realizes the complete separation of oil, gas and water through dynamic gravity separation and shallow pool separation. However, under this scheme, the device uses gravity and shallow pool separation, and the separation time is long, and the medium cannot be separated quickly. The device described in Chinese patent document CN202223137095.0 improves the separation of oil, gas and water by setting up cyclone separation and adding electromagnetic coils. However, when the inlet liquid flow rate is small, when the mixed liquid is separated from the gas-liquid to the oil-water separation stage, the mixed liquid flow rate will be too small, thereby reducing the oil-water separation efficiency. In addition, when dealing with large processing volumes underground, the equipment processing capacity may be insufficient. Moreover, the device is generally a tank body that occupies a large space and cannot be used for narrow space operations underground. Summary of the invention

[0003] The purpose of the present invention is to provide an efficient downhole oil-gas-water three-phase separation device suitable for ultra-high liquid production oil wells. This efficient downhole oil-gas-water three-phase separation device suitable for ultra-high liquid production oil wells is used to solve the problems of long separation time of the oil-gas-water three-phase separation device in the prior art or insufficient equipment processing capacity when dealing with large downhole processing volumes.

[0004] The technical solution adopted by the present invention to solve its technical problems is: this downhole oil-gas-water three-phase efficient separation device suitable for ultra-high liquid production oil wells includes a combined shell and a multi-stage separation structure. The upper end of the combined shell is connected to an upper connection, the lower end of the combined shell is connected to a lower connection, and the lower end of the lower connection is connected to a bridge channel. The multi-stage separation structure is arranged in the combined shell. The combined shell is formed by sequentially connecting graded shells. An oil discharge channel, an exhaust channel, and a water discharge channel are arranged in the wall of the combined shell. The multi-stage separation structure is composed of each stage of the separation structure connected in series in the combined shell from top to bottom. Each stage of the separation structure is connected to the oil discharge channel, the exhaust channel, and the water discharge channel. The oil phase is discharged through the upper and lower ends of the combined shells. The water phase is discharged through the bridge channel. There is an outlet at the upper end of the exhaust channel, and the outlet is arranged on the combined shell. The gas phase is discharged from the outlet. Each level of separation structure has a graded shell and a graded three-phase separator group. The graded shell is composed of an upper shell and a lower shell threaded together. The lower shell is provided with a graded first inlet. The graded three-phase separator group includes a plurality of parallel three-phase separators, an oil phase deposition plate, a degassing combination plate, a gas-liquid separation cylinder, a combined orifice plate, and an underflow cover. The degassing combination plate is composed of an upper plate and a lower plate arranged on the outer edge of the central column. The upper plate and the lower plate are respectively threadedly connected to the upper shell, and the lower plate is evenly arranged around the central column. There are multiple air outlets, an annular cavity is formed between the upper plate and the lower plate, the annular cavity is communicated with the air outlet and the air outlet respectively, the upper surface of the upper plate and the central column form an annular liquid tank, the upper plate also has multiple third inlets evenly arranged around the central column, the third inlet is communicated with the annular liquid tank, the center of the central column is arranged from top to bottom with the third inlet, the middle cavity, and the air outlet are communicated with each other, the middle cavity is communicated with the annular cavity, the central column is also evenly arranged with multiple liquid outlets, an oil phase deposition plate is arranged above the degassing combination plate, the degassing combination plate and the oil phase deposition plate are arranged at intervals, the combination orifice plate is threadedly connected to the upper part of the lower shell, the combination orifice plate is arranged with multiple through holes, and the lower inner wall of each through hole They all have steps, and a second inlet is evenly arranged on each step. A gas-liquid separation cylinder is threadedly connected to the upper end of each through hole to form a separator cylinder. A three-phase separator is arranged in each separator cylinder. The outer spiral flow channel of the three-phase separator is above the second inlet. The upper overflow port of each three-phase separator is connected to an overflow connection port of the oil phase deposition plate, the air outlet of each three-phase separator is connected to the air outlet hole of the degassing combination plate, the oil-water inlet of each three-phase separator is connected to the third inlet of the degassing combination plate, and the bottom flow port at the lower end of each three-phase separator is connected to one of the through holes in the bottom flow cover; the cavity between the oil and gas deposition plate and the upper shell is connected to the oil discharge channel.

[0005] The three-phase separator in the above scheme includes a separation chamber, a degassing hood, an inner spiral flow channel, and a connecting cover. The upper part of the separation chamber is provided with an outer spiral flow channel. The separation chamber below the outer spiral flow channel is a conical cylinder, and the lower port of the conical cylinder is a bottom flow port. The inner spiral flow channel is located in the separation chamber and on the top of the conical cylinder, and an overflow pipe is provided at the center of the inner spiral flow channel; the connecting cover is clamped on the upper port of the separation chamber, the degassing hood is clamped on the connecting cover, the lower end of the degassing hood is a conical cylinder with holes, and the top of the conical cylinder is an air outlet cylinder, the upper end air outlet of the air outlet cylinder is threadedly connected with the air outlet hole of the degassing combination plate, the oil-water pipe of the connecting cover passes through the degassing hood and is threadedly connected with the third inlet of the degassing combination plate, and the overflow pipe of the inner spiral flow channel passes through the oil-water pipe and is threadedly connected with the overflow connection port of the oil phase deposition plate; the annulus between the overflow pipe and the oil-water pipe is an oil-water channel, and the annulus between the oil-water pipe and the air outlet cylinder is an air outlet channel.

[0006] In the above scheme, the multi-stage separation structure has three stages, namely, a primary separation structure, a secondary separator structure, and a tertiary separation structure; the primary upper shell of the primary separation structure is threadedly connected to the upper connection through a connecting head at the upper end of the shell top, and the upper connection is also provided with an oil drainage channel, and the oil phase is discharged through the oil drainage channel of the upper connection.

[0007] In the above scheme, the lower end of the separation lower shell of the three-stage separation structure is threadedly connected to the upper end of the lower connection, the lower end of the lower connection is threadedly connected to the bridge channel, a plurality of drainage holes are distributed in the lower connection, the upper end of each drainage hole is connected to the bottom flow outlet, the lower end of each drainage outlet is communicated with the drainage cavity in the lower connection, the lower end of the drainage cavity is threadedly connected to the bridge channel, the bridge channel has a drainage outlet, and the separated water is discharged through the drainage outlet.

[0008] In the above scheme, the primary separation structure, the secondary separator structure, and the tertiary separation structure all have five parallel three-phase separators, one of which is a small three-phase separator arranged in the center, and the other four are large three-phase separators, and the four large three-phase separators are evenly arranged around the small three-phase separator.

[0009] In the above scheme, a Tesla valve is arranged in the oil discharge channel arranged in the wall of the combined shell, a Tesla valve is arranged in the exhaust channel arranged in the wall of the combined shell, and a Tesla valve is arranged in the drainage channel arranged in the wall of the combined shell. Beneficial Effects

[0010] 1. The present invention applies multi-stage series-connected single-stage parallel cyclone separators to offshore oil fields. The three-stage separation structure works independently. According to the change of downhole processing volume, the secondary separation structure can be increased or decreased to cope with the change of processing volume, which greatly enhances the processing capacity and working range of the equipment, greatly improves the separation efficiency, and greatly improves the applicability. The present invention enables the gas-liquid separation and oil-water separation of the gas-containing mixed medium while occupying a small space. The gas phase after separation is discharged to the external space of the equipment, which increases the service life of other operating equipment. At the same time, the pre-separation of the produced liquid is completed, which indirectly improves the oil field recovery rate and reduces the energy consumption of the subsequent separation system.

[0011] 2. The present invention avoids the corrosion of the gas phase on the subsequent equipment, thereby increasing the service life of the equipment. Meanwhile, it avoids the influence of the gas phase on the oil-water separation, thereby increasing the oil-water separation efficiency and maximizing the economic benefits.

[0012] 3. In the three-phase separation part of the present invention, after the gas-liquid separation, an oil-water separator layout that does not take up too much space is designed through the use of internal combination plates and degassing combination plates and other structures. The space occupied by only one cyclone separator is used to achieve efficient separation of the three phases of oil, water and gas, further reducing the space occupied by the device and making the device more widely applicable.

[0013] 4. The present invention can be connected to the narrow space of the wellbore, and realizes the efficient separation of the three-phase medium of oil, water and gas. The layout of multi-stage series connection and single-stage parallel connection can cope with the large-scale processing of offshore oil fields and the complex working conditions of narrow underground space. In addition, the device can flexibly respond to the changes in the processing volume of offshore oil fields by adding or reducing the secondary separation structure, so that the device is in the optimal processing condition, making the applicability of the device wider and further improving the economic efficiency of oil field exploitation.

[0014] 5. The present invention applies a cyclone separator to separate the oil, water and gas three-phases, with high separation efficiency and short separation time. A plurality of cyclone separators are installed through structural design. When the gas-liquid separation and the oil-water separation are performed separately, only the space occupied by one cyclone is used, thereby realizing efficient separation of oil, water and gas under the working condition of occupying a small space.

[0015] 6. The present invention occupies a small space and can be directly applied to narrow underground spaces. There is no need to lift the produced fluid to the ground for separation, which reduces energy waste and saves economic costs. The use of multiple cyclone separators allows the equipment to better cope with large-volume working conditions in offshore oil fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall appearance diagram of the present invention.

[0017] Figure 2The figures are cross-sectional views of the present invention, wherein (a) is a cross-sectional view of the gas circulation pipeline of the present invention; and (b) is a cross-sectional view of the oil-water circulation pipeline of the present invention.

[0018] Figure 3 Schematic diagram of the primary separation structure, where (a) is the appearance diagram of the primary separation structure; (b) is the cross-sectional view of the primary separation structure.

[0019] Figure 4 This is the exploded diagram of the first-level separation structure.

[0020] Figure 5 Schematic diagram of the secondary separation structure, where (a) is the appearance diagram of the secondary separation structure; (b) is the cross-sectional view of the secondary separation structure.

[0021] Figure 6 This is the exploded diagram of the secondary separation structure.

[0022] Figure 7 Schematic diagram of the three-stage separation structure, where (a) is the appearance diagram of the three-stage separation structure; (b) is the cross-sectional view of the three-stage separation structure.

[0023] Figure 8 This is an exploded diagram of the three-level separation structure.

[0024] Fig. 9 This is the appearance diagram of the combined orifice plate.

[0025] Fig.10 Figure 2 is an upper connection diagram, where (a) is an appearance diagram of the upper connection; (b) is a cross-sectional view of the upper connection oil drain channel.

[0026] Fig.11 Figure 2 is a diagram of a degassing combination plate, wherein (a) is a view of the upper half of the degassing combination plate; (b) is a view of the lower half of the degassing combination plate; (c) is a vertical cross-sectional view of the degassing combination plate; and (d) is a horizontal cross-sectional view of the degassing combination plate.

[0027] Fig.12 This is a diagram showing the parts of a three-phase separator.

[0028] In the figure, 101-a first-level upper shell, 1011-a first-level upper exhaust channel, 1012-a first-level upper oil discharge channel, 1013-air outlet, 102-a first-level lower shell, 1021-a first-level inlet, 1022-a first-level lower exhaust channel, 1023-a first-level lower oil discharge channel, 103-a first-level combination orifice plate, 1031-a first-level second inlet, 1032-a first-level small second inlet, 104-a degassing combination plate, 1041-a first-level air outlet, 1042-a first-level third inlet, 1043-a first-level liquid outlet, 1044-a first-level small third inlet, 1045-a first-level small air outlet, 1046-a degassing port, 105-an oil phase deposition plate, 1051-a first-level Overflow connection port, 1052-first-level small overflow connection port, 106-first-level underflow cover, 1061-first-level underflow connection port, 1062-first-level small underflow connection port, 107-first-level three-phase separator, 1071-first-level separation chamber, 1072-first-level spiral flow channel, 1073-first-level degassing hood, 1074-first-level connection cover, 1075-first-level gas outlet, 1076-first-level oil-water inlet, 1077-first-level overflow port, 1078-first-level underflow port, 108-first-level gas-liquid separation cylinder, 109-Tesla valve, 110-upper connection, 1101-upper connection oil discharge channel, 111-first-level three-phase small separator, 112-first-level gas-liquid small separation cylinder;

[0029] 201-secondary upper shell, 2011-secondary upper exhaust channel, 2012-secondary upper drain port, 2013-secondary upper drain channel, 2014-secondary upper oil drain channel, 202-secondary lower shell, 2021-secondary first inlet, 2022-secondary lower exhaust channel, 2023-secondary lower drain channel, 2024-secondary lower oil drain channel, 203-secondary combination orifice plate, 2031-secondary second inlet, 2032-secondary small second inlet, 204-secondary degassing group Composite plate, 2041-secondary gas outlet, 205-secondary oil phase deposition plate, 2051-secondary overflow connection port, 206-secondary underflow cover, 2061-secondary underflow connection port, 207-secondary three-phase separator, 2071-secondary separation chamber, 2072-secondary spiral flow channel, 2073-secondary degassing hood, 2074-secondary connection cover, 208-secondary gas-liquid separation cylinder, 209-secondary Tesla valve, 210-secondary three-phase small separator, 211-secondary gas-liquid small separation cylinder;

[0030] 301-three-stage upper shell, 3011-three-stage upper exhaust channel, 3012-three-stage upper drain port, 3013-three-stage upper drain channel, 3014-three-stage upper oil drain port, 302-three-stage lower shell, 3021-three-stage first inlet, 3022-three-stage lower drain channel, 303-three-stage combination orifice plate, 304-three-stage degassing combination plate, 305-three-stage oil phase deposition plate, 3051-three-stage overflow connection port, 306-three-stage bottom flow cover, 307-three-stage bottom flow cover, 308-three-stage bottom flow cover, 309-three-stage bottom flow cover, 301-three-stage upper shell, 3011-three-stage upper exhaust channel, 3012-three-stage upper drain port, 3013-three-stage upper drain port, 3014-three-stage lower oil drain port, 302-three-stage lower shell, 3021-three-stage first inlet, 3022-three-stage bottom drain channel, 303-three-stage combination orifice plate, 304-three-stage degassing combination plate, 305-three-stage oil phase deposition plate, 3051-three-stage overflow connection port, 306-three-stage bottom flow cover ... 061-three-stage bottom flow connection port, 307-three-stage three-phase separator, 3071-three-stage separation chamber, 3072-three-stage spiral flow channel, 3073-three-stage degassing hood, 3074-three-stage connection cover, 308-three-stage gas-liquid separation cylinder, 309-secondary Tesla valve, 310-lower connection, 3101-drain port, 311-bridge channel, 3111-drain outlet, 312-three-stage three-phase small separator, 313-three-stage gas-liquid small separation cylinder. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings:

[0032] See also Figure 1-Figure 12The downhole oil-gas-water three-phase high-efficiency separation device suitable for ultra-high liquid production oil wells includes a combined shell and a multi-stage separation structure. The upper end of the combined shell is connected to the upper connection, the lower end of the combined shell is connected to the lower connection, and the lower end of the lower connection is connected to the bridge channel. The multi-stage separation structure is arranged in the combined shell. The combined shell is formed by sequentially connecting the graded shells. An oil discharge channel, an exhaust channel, and a water discharge channel are arranged in the wall of the combined shell. The multi-stage separation structure is composed of the separation structures of each stage connected in series from top to bottom in the combined shell. The separation structures of each stage are connected to the oil discharge channel, the exhaust channel, and the water discharge channel. The oil phase is discharged through the upper connection, and the water phase is discharged through the bridge channel. , an air outlet is provided at the upper end of the exhaust channel, the air outlet is arranged on the combined shell, and the gas phase is discharged from the air outlet; each level of separation structure has a graded shell and a graded three-phase separator group, the graded shell is composed of an upper shell and a lower shell threadedly connected, the lower shell is provided with a graded first inlet, the graded three-phase separator group includes a plurality of parallel three-phase separators, an oil phase deposition plate, a degassing combination plate, a gas-liquid separation cylinder, a combined orifice plate, and an underflow cover, the degassing combination plate is composed of an upper plate and a lower plate arranged on the outer edge of the central column, the upper plate and the lower plate are respectively threadedly connected to the upper shell, the lower plate is evenly arranged with a plurality of air outlets around the central column, the upper plate There is an annular cavity between the upper and lower plates, which are communicated with the gas outlet and the gas outlet hole respectively. The upper surface of the upper plate and the central column form an annular liquid groove. The upper plate also evenly arranges a plurality of third inlets around the central column, which are communicated with the annular liquid groove. The center of the central column is provided with a third inlet, an intermediate cavity, and a gas outlet hole which are communicated with each other from top to bottom. The intermediate cavity is communicated with the annular cavity. The central column is also evenly provided with a plurality of liquid outlet holes. An oil phase deposition plate is arranged above the degassing combination plate, and the degassing combination plate and the oil phase deposition plate are arranged at intervals. The combination orifice plate is threadedly connected to the upper part of the lower shell, and the combination orifice plate is provided with a plurality of through holes, and the lower inner wall of each through hole has a step. A second inlet is evenly arranged on each step, and a gas-liquid separation cylinder is threadedly connected to the upper end of each through hole to form a separator cylinder. A three-phase separator is arranged in each separator cylinder, and the outer spiral flow channel of the three-phase separator is above the second inlet. The upper overflow port of each three-phase separator is connected to an overflow connection port of the oil phase deposition plate, the air outlet of each three-phase separator is connected to the air outlet hole of the degassing combination plate, the oil-water inlet of each three-phase separator is connected to the third inlet of the degassing combination plate, and the bottom flow port at the lower end of each three-phase separator is connected to one of the through holes of the bottom flow cover; the cavity between the oil and gas deposition plate and the upper shell is connected to the oil discharge channel.

[0033] The multi-stage separation structure of the present invention has three stages, namely, a primary separation structure, a secondary separator structure, and a tertiary separation structure; the primary upper shell of the primary separation structure is threadedly connected to the upper connection through the upper end connector of the shell top, and the upper connection is also provided with an oil discharge channel, and the oil phase is discharged through the oil discharge channel of the upper connection. The gas-containing oil-water mixture enters the primary separation structure, the secondary separation structure, and the tertiary separation structure at the same time for separation, and the gas phase after separation is discharged to the outside of the device along the exhaust channel in the device, and after the oil and water are separated, the separated oil phase is discharged to the upper connection together, and is lifted to the ground through the pump structure connected to the upper connection; the separated water phase is injected back into the well from the lower connection through the ground pump structure connected to the lower connection.

[0034] The primary separation structure includes a primary upper shell 101, a primary lower shell 102, a combined orifice plate 103, a degassing combined plate 104, an oil phase deposition plate 105, a primary underflow cover 106, a primary three-phase separator 107, a primary gas-liquid separation cylinder 108, a primary Tesla valve 109, an upper connection 110, a primary three-phase small separator 111, and a primary gas-liquid small separation cylinder 112; the primary upper shell 101, the primary lower shell 102, the primary gas-liquid separation cylinder 108, and the primary gas-liquid small separation cylinder 112 are all hollow structures, and there are a primary upper exhaust channel 1011, a primary upper oil discharge channel 1012, and an air outlet 1013 on the primary upper shell 101; The first lower shell 102 is provided with four circumferentially distributed first inlets 1021, a first lower exhaust channel 1022, and a first lower oil discharge channel 1023; the combination orifice plate 103 is provided with a first second inlet 1031; four first-level gas outlets 1041 and a first-level small gas outlet 1045 are evenly distributed on the lower plate of the degassing combination plate 104, and the gas phase after gas-liquid separation is discharged from the first-level gas outlet; four first-level third inlets 1042 and a first-level small third inlet 1044 are evenly distributed on the upper plate, and the oil-water mixture after degassing enters the first three-phase separator 1031 through the first-level third inlet 1042 and the first-level small third inlet 1044. 7 and the first-level three-phase small separator 111 for oil-water separation; four first-level overflow connection ports 1051 and one first-level small overflow connection port 1052 are evenly distributed on the oil phase deposition plate 105; four first-level underflow connection ports 1061 and one first-level small underflow connection port 1062 are evenly distributed on the first-level underflow cover 106, which are connected to the first-level three-phase separator 107 and the first-level three-phase small separator 111; the first-level three-phase separator 107 is specifically divided into a first-level separation chamber 1071, a first-level spiral flow channel 1072, a first-level degassing cover 1073, and a first-level connection cover 1074, the first-level separation chamber 1071 has an outer spiral flow channel, and the first-level spiral flow channel 1072 has an outer spiral flow channel. 72 is an inner spiral flow channel; the first-stage three-phase small separator 111 is specifically divided into a first-stage separation chamber, a first-stage spiral flow channel (inner spiral flow channel), a first-stage degassing cover, and a first-stage connection cover; the upper end of the first-stage upper shell 101 is connected to the lower end of the upper connection 110 by threading, and the lower end is connected to the upper end of the first-stage lower shell 102 by threading, and at the same time, there is a section of threaded structure inside, the oil phase deposition plate 105 is fixed to the uppermost end of the threaded structure, and the degassing combination plate 105 is threadedly fixed to the lower half; the lower end of the first-stage lower shell 102 is connected to the upper end of the second-stage upper shell 201 by threading; the first-stage underflow cover 106 is threadedly connected to the inner side of the upper end of the second-stage upper shell 201 by internal threads;The first-level gas outlet 1075 at the upper end of the first-level three-phase separator 107 is connected to the gas outlet 1041 on the degassing combination plate 104 by threads, the first-level oil-water inlet 1076 is connected to the third inlet 1042 on the degassing combination plate 104 by threads, the first-level overflow port 1077 is connected to the first-level overflow connection port 1051 on the oil phase deposition plate 105, and the first-level underflow port 1078 at the lower end is connected to the first-level underflow connection port 1061 on the first-level underflow cover 106; the first-level gas outlet 1045 at the upper end of the first-level three-phase small separator 111 is connected to the gas outlet 1045 on the degassing combination plate 104 by threads, the first-level oil-water inlet is connected to the third inlet 1042 on the degassing combination plate 104 by threads, the first-level overflow port 1077 is connected to the first-level overflow connection port 1051 on the oil phase deposition plate 105, and the first-level underflow port 1078 at the lower end is connected to the first-level underflow connection port 1061 on the first-level underflow cover 106; The third inlet 1044 is connected by thread, the first-level overflow port is connected to the first-level overflow connection port 1052 on the oil phase deposition plate 105, and the lower first-level underflow port is connected to the first-level underflow connection port 1062 on the first-level underflow cover 106; the first-level gas-liquid separation cylinder 108 and the first-level gas-liquid small separation cylinder 112 are connected to the upper thread of the combined orifice plate through the lower thread structure; the first-level Tesla valve 109 is placed in the first-level lower exhaust channel 1022 and the first-level lower oil discharge channel 1023 of the first-level lower shell 102; the upper end of the upper connection 110 is connected to the corresponding pump and motor housing, and after the connection, the pump and motor parts are connected through the corresponding shaft connection device to work. ;

[0035] During operation, the gas-containing oil-water mixture enters the device through the primary inlet 1021, enters the primary three-phase separator 107 along the primary second inlet 1031 for gas-liquid separation, and enters the primary three-phase small separator 111 along the primary second inlet 1032 for gas-liquid separation. After flowing through the primary separation chamber 1071 of the primary three-phase separator 107 and the flow channel structure on the outer wall of the primary separation chamber of the primary three-phase small separator 111, it obtains a sufficient speed for gas-liquid separation. After separation, the gas phase is located in the inner layer close to the primary degassing cover 1073, enters the interior along the small holes on the primary degassing cover 1073, and is finally discharged from the middle degassing port 1046 of the degassing combination plate 104 along the gas outlet 1013. The oil-water mixture is located in the outer layer close to the primary gas-liquid separation cylinder 108 and the primary gas-liquid small separator 111. Inside the separation cylinder 112, it flows into the upper half of the degassing combination plate 104 along the first-level liquid outlet 1043, enters the first-level separation chamber 1071 along the first-level oil-water inlet 1076, flows through the spiral flow channel 1072 for oil-water separation, and after separation, the oil phase is located in the center and flows into the lower end opening of the first-level spiral flow channel 1072, and finally flows out from the first-level overflow port to the oil phase deposition plate 105 and then flows into the first-level upper oil discharge channel 1012, and then flows into the upper connecting oil discharge channel 1101, and is lifted to the ground after being sucked by the pump; the water phase is located in the outer layer close to the inner wall of the first-level separation chamber 1071, flows downward along the first-level bottom flow port 1078 into the space formed by the first-level bottom flow cover 106 and the second-level upper shell 201, and flows into the second-level upper drainage channel 2013 along the second-level upper drainage port 2012.

[0036] The secondary separation structure comprises: a secondary upper shell 201, a secondary lower shell 202, a secondary combination plate 203, a secondary degassing combination plate 204, an oil phase deposition plate 205, a secondary underflow cover 206, a secondary three-phase separator 207, a secondary gas-liquid separation cylinder 208, a secondary Tesla valve 209, a secondary three-phase small separator 210, and a secondary gas-liquid small separation cylinder 211; the secondary lower shell 202, the secondary gas-liquid separation cylinder 208, and the secondary gas-liquid small separation cylinder 211 are hollow structures, and there are a secondary upper exhaust channel 2011, a secondary upper drain port 2012, a secondary upper drain channel 2013, and a secondary upper oil drain channel 2014 on the secondary upper shell 201; the secondary lower shell 20 2 is provided with four circumferentially distributed secondary first inlets 2021, and also has a secondary lower exhaust channel 2022, a secondary lower drainage channel 2023, and a secondary lower oil drainage channel 2024; the secondary combination orifice plate 203 is provided with a secondary second inlet 2031 and a secondary small second inlet 2032; five secondary gas outlets 2041 are evenly distributed on the lower part of the secondary degassing combination plate 204, and the gas phase after gas-liquid separation is discharged from the secondary gas outlet 2041, and five secondary third inlets 2042 are evenly distributed on the upper part of the plate, and the oil-water mixture after degassing enters the secondary three-phase separator 207 from the secondary third inlet 2042 for oil-water separation; the oil phase deposition plate 205 is evenly distributed on the lower part of the plate Five secondary overflow connection ports 2051; five secondary underflow connection ports 2061 are distributed circumferentially on the secondary underflow cover 206, which are connected to the secondary three-phase separator 207 and the secondary three-phase small separator 210; the secondary three-phase separator 207 is specifically divided into a secondary separation chamber 2071, a secondary spiral flow channel 2072, a secondary degassing cover 2073, and a secondary connection cover 2074; the secondary three-phase small separator 210 is specifically divided into a secondary separation chamber, a secondary spiral flow channel, a secondary degassing cover, and a secondary connection cover; the lower end of the secondary upper shell 201 is connected to the upper end of the secondary lower shell 202 by a thread, and at the same time, there is a thread structure inside, and the secondary oil phase deposition plate 205 is fixed at the end of the thread structure. At the upper end, the secondary degassing combined plate 205 is threadedly fixed to the lower half; the lower end of the secondary lower shell 202 is threadedly connected to the upper end of the tertiary upper shell 301; the secondary underflow cover 206 is threadedly connected to the inner side of the upper end of the tertiary upper shell 301 through internal threads; the secondary air outlet at the upper end of the secondary three-phase separator 207 is threadedly connected to the secondary air outlet 2041 on the secondary degassing combined plate 204, the secondary oil-water inlet is threadedly connected to the secondary third inlet 2042 on the secondary degassing combined plate 204, the secondary overflow port is connected to the secondary overflow connection port 2051 on the secondary oil phase deposition plate 205, and the secondary underflow port at the lower end is connected to the secondary underflow connection port 2061 on the secondary underflow cover 206;The secondary gas outlet at the upper end of the secondary three-phase small separator 210 is connected to the gas outlet 2045 on the degassing assembly plate 204 through a threaded connection, the secondary oil-water inlet is connected to the secondary third inlet on the degassing assembly plate 204 through a threaded connection, the secondary overflow port is connected to the secondary overflow connection port on the oil phase deposition plate 205, and the lower primary underflow port is connected to the secondary underflow connection port 2062 on the secondary underflow cover 206; the secondary gas-liquid separation cylinder 208 and the secondary gas-liquid small separation cylinder 211 are connected to the upper thread of the secondary assembly plate 204 through the lower thread structure; the secondary Tesla valve 209 is placed in the secondary lower exhaust channel 2022, the secondary lower drainage channel 2023, and the secondary lower oil drainage channel 2024 of the secondary lower shell 202. ;

[0037] During operation, the gas-containing oil-water mixture enters the device through the secondary inlet 2021, enters the secondary three-phase separator 207 and the secondary three-phase small separator 210 along the secondary second inlet 2031 for gas-liquid separation, and obtains a sufficient speed for gas-liquid separation after flowing through the flow channel structure on the outer wall of the secondary separation chamber 2071 of the secondary three-phase separator 207 and the secondary three-phase small separator 210. After separation, the gas phase is located in the inner layer close to the secondary degassing hood 2073, enters the interior along the small holes on the secondary degassing hood 2073, and finally is discharged into the secondary upper exhaust channel 2011 from the degassing port between the upper and lower parts of the secondary degassing combination plate 204. Due to the one-way check effect of the secondary Tesla valve 209, the gas phase can only flow upward, and flows into the primary upper exhaust channel 1011 along the primary lower exhaust channel 1022, and then the gas phase separated from the secondary separation part is discharged from the device from the gas outlet 1013. The oil-water mixture is located in the outer layer close to the secondary gas-liquid separation cylinder 208 and the secondary gas-liquid small separation cylinder 211. , flows into the upper part of the secondary degassing assembly plate 204 along the secondary liquid outlet, enters the secondary separation chamber 2071 along the secondary oil-water inlet, flows through the secondary spiral flow channel 2072 for oil-water separation, and after separation, the oil phase is in the center, flows into the lower opening of the secondary spiral flow channel 2072, and finally flows out from the secondary overflow port to the secondary oil phase deposition plate 205 and then flows into the secondary upper oil discharge channel 2014, flows into the primary lower oil discharge channel 1023 along the flow channel, and then flows into the secondary upper oil discharge channel 1 012, and flows into the upper connected oil drainage channel 1101 together with the oil phase separated from the first-level separation part for collection, the water phase stays in the outer layer and flows along the second-level bottom flow port into the space formed by the second-level bottom flow cover 206 and the third-level upper outer shell 301, flows along the third-level upper drainage port 3012 to the third-level upper drainage channel 3013, and converges with the water phase separated from the first-level separation part that flows from the second-level upper drainage channel 2013 to the second-level lower drainage channel 2023, and then flows downward into the third-level upper drainage channel 3013.

[0038] The three-stage separation structure parts include: a three-stage upper shell 301, a three-stage lower shell 302, a three-stage combined orifice plate 303, a three-stage degassing combined plate 304, a three-stage oil phase deposition plate 305, a three-stage underflow cover 306, a three-stage three-phase separator 307, a three-stage gas-liquid separation cylinder 308, a three-stage Tesla valve 309, a lower connection 310, a bridge channel 311, a three-stage three-phase small separator 312, and a three-stage gas-liquid small separation cylinder 313; the three-stage upper shell 301, the three-stage lower shell 302, the three-stage gas-liquid separation cylinder 308, and the three-stage gas-liquid small separation cylinder 312 are hollow structures, and there are three-stage upper exhaust channels 3011, three-stage upper drain ports 3012, and three-stage upper drain channels 3013 on the three-stage upper shell 301. , three-stage upper oil discharge port 3014; the three-stage lower shell 302 is provided with four circumferentially distributed three-stage first inlets 3021, and also has a three-stage lower exhaust channel 3022; the three-stage combination orifice plate 303 is provided with a three-stage second inlet 3031; five three-stage gas outlets are evenly distributed on the lower plate of the three-stage degassing combination plate 304, and the gas phase after gas-liquid separation is discharged from the three-stage gas outlet, and five three-stage third inlets are evenly distributed on the upper plate, and the oil-water mixture after degassing enters the three-stage three-phase separator 307 and the three-stage three-phase small separator from the three-stage third inlet for oil-water separation; five three-stage overflow connection ports are evenly distributed on the three-stage oil phase deposition plate 305; the three-stage bottom flow cover 306 is evenly distributed The five parts include a three-stage bottom flow connection port, which is connected to a three-stage three-phase separator 307 and a three-stage three-phase small separator 312; the three-stage three-phase separator 307 is specifically divided into a three-stage separation chamber 3071, a three-stage spiral flow channel 3072, a three-stage degassing hood 3073, and a three-stage connection cover 3074; the three-stage three-phase small separator 312 is specifically divided into a three-stage separation chamber, a three-stage spiral flow channel, a three-stage degassing hood, and a three-stage connection cover; the lower end of the three-stage upper shell 301 is connected to the upper end of the three-stage lower shell 302 by a thread, and at the same time, there is a thread structure inside, the three-stage oil phase deposition plate 305 is fixed at the uppermost end of the thread structure, and the three-stage degassing combination plate 305 is threadedly fixed to the lower half; the lower end of the three-stage lower shell 302 The third-stage underflow cover 306 is connected to the inner thread of the upper end of the lower connection 310 through an internal thread; the third-stage outlet of the third-stage three-phase separator 307 and the third-stage three-phase small separator 312 are connected to the third-stage outlet of the third-stage degassing combination plate 304 through a thread, the third-stage oil-water inlet is connected to the third-stage third inlet of the third-stage degassing combination plate 304 through a thread, the third-stage overflow port is connected to the third-stage overflow connection port on the third-stage oil phase deposition plate 305, and the third-stage underflow port at the lower end is connected to the third-stage underflow connection port on the third-stage underflow cover 306; the third-stage gas-liquid separation cylinder 308 and the third-stage gas-liquid small separation cylinder 313 are connected to the upper thread of the third-stage combination plate 304 through a lower thread structure;The three-stage Tesla valve 309 is placed in the three-stage lower exhaust channel 3022 and the three-stage lower oil discharge channel 3023 of the three-stage lower shell 302, and the bridge channel 311 is connected to the upper end of the lower connection 310 through the upper end threaded structure; the first-stage three-phase separator 107, the second-stage three-phase separator 207, the third-stage three-phase separator 307 and the first-stage gas-liquid separation cylinder 108, the second-stage gas-liquid separation cylinder 208, and the third-stage gas-liquid small separation cylinder 308 are all four distributed on the circumference, the first-stage three-phase small separator 111, the second-stage three-phase small separator 210, and the third-stage three-phase small separator 312 are all arranged in the middle, and the first-stage gas-liquid small separation cylinder 112, the second-stage three-phase small separation cylinder 211, and the third-stage three-phase small separation cylinder 313 are all arranged in the middle. Therefore, the five separation devices work simultaneously to meet the large displacement working conditions of the equipment. ;

[0039] During operation, the gas-containing oil-water mixture enters the device through the third-stage inlet 3021, enters the third-stage three-phase separator 307 and the third-stage three-phase small separator 312 along the third-stage second inlet 3031 for gas-liquid separation, and obtains a sufficient speed for gas-liquid separation after flowing through the flow channel structure on the outer wall of the third-stage separation chamber 3071 of the third-stage three-phase separator 307 and the third-stage three-phase separator 312. After separation, the gas phase is located in the inner layer close to the third-stage degassing hood, enters the interior along the small holes on the third-stage degassing hood, and finally exits from the third-stage degassing hood. The gas phase flows upward and merges with the gas phase separated by the primary separation structure and the secondary separation structure, and then is discharged from the device along the gas outlet 1013; the oil-water mixed liquid is located in the outer layer close to the third-stage gas-liquid separation cylinder 308 and the third-stage gas-liquid small separation cylinder 313, flows into the upper part of the third-stage degassing combined plate 304 along the third-stage liquid outlet, enters the third-stage separation chamber 3071 along the third-stage oil-water inlet, and flows through the third-stage spiral After the cyclone 3072, the oil phase is separated from the water. After separation, the oil phase is in the center and flows into the lower opening of the third-stage spiral flow channel 3072. Finally, it flows out from the third-stage overflow port to the third-stage oil phase deposition plate 305 and then flows into the third-stage upper oil discharge channel 3014. It flows along the flow channel into the second-stage lower oil discharge channel 2024, and then flows into the second-stage upper oil discharge channel 2014. It flows into the first-stage lower oil discharge channel 1023 together with the oil phase separated from the second-stage separation part, and then flows into the first-stage upper oil discharge channel 1012 and the first-stage separation part. The separated oil phases merge and flow together into the upper connection 110 and the upper connection oil discharge channel 1101 for collection; the water phase is in the outer layer and flows along the third-level bottom flow port into the space formed by the third-level bottom flow cover 306 and the lower connection 310, and together with the water phases separated from the first-level separation part and the second-level separation part flowing along the third-level upper drainage channel 3013, they flow from the drainage port 3101 to the bridge channel 311, and finally are discharged from the drainage outlet 3111 to the lower end connection pump structure, and are sucked back into the well through the pump structure.

[0040] like Figure 1As shown, the device is placed vertically in the downhole pipeline. When working, the gas-containing oil-water mixture enters the separation device through the first inlet 1021 of the first level, the first inlet 2021 of the second level, and the first inlet 3021 of the third level under the downhole high-pressure environment through the pressure difference for separation. After separation, the oil phase after three separations is discharged from the upper connection 110. The upper end of the upper connection 110 is connected to the pump structure for lifting the oil phase. After connection, the oil phase discharged from the upper connection 110 after separation is sucked by the pump organization and lifted to the ground. The lower connection is connected to the bridge channel and the lower end reinjection pump structure. After connection, the water phase separated by the device is discharged to the lower connection 110 and then flows out of the reinjection pump structure along the bridge channel 111, and is reinjected into the downhole through the reinjection pump. It should be noted that the pump structure after the upper and lower ends of the device are connected can work simultaneously through the transmission shaft connection, and can realize the operation of dual motors driving dual pumps, which greatly improves the separation efficiency. It is suitable for the oil-water flow pipeline cross-sectional view and the gas flow pipeline cross-sectional view of the downhole oil-gas-water three-phase high-efficiency separation device for ultra-high liquid production oil wells. Figure 2As shown, the oil-water mixture enters the device through the primary inlet 1021, the secondary first inlet 2021, and the tertiary first inlet 3021. After gas-liquid separation, the gas in the primary separation structure is discharged along the middle of the upper and lower parts of the degassing combined plate 104 through the degassing port 1046 along the gas outlet 1013. In the secondary separation structure, the gas is discharged into the secondary upper exhaust channel 2011 through the degassing port along the middle of the upper and lower parts of the secondary degassing combined plate 204. Due to the one-way check effect of the secondary Tesla valve 209, the gas phase can only flow upward, and after flowing into the primary upper exhaust channel 1011 along the primary lower exhaust channel 1022, the gas phase separated from the primary separation part is discharged from the device from the gas outlet 1013. In the tertiary separation structure, the gas flows along the tertiary degassing combined plate 304. The middle of the upper and lower parts is discharged into the three-stage upper exhaust channel 3011 through the degassing port, and the gas phase flows upward and merges with the gas phase separated by the primary separation part and the secondary separation part, and then is discharged from the device along the gas outlet 1013. In the oil-water circulation pipeline part, the oil phase separated by the primary separation structure flows out along the primary overflow port 1077 to the oil phase deposition plate 105 and then flows into the primary upper oil discharge channel 1012, and then flows into the upper connecting oil discharge channel 1101, and is lifted to the ground after being sucked by the pump. The separated water phase flows along the primary bottom flow port 1078 into the space formed by the primary bottom flow cover 106 and the secondary upper shell 201, and flows into the secondary upper drainage channel 2013 along the secondary upper drainage port 2012. The oil phase separated by the secondary separation structure flows out along the secondary overflow port to the secondary oil phase deposition plate 205 and then flow into the secondary upper oil drainage channel 2012, flow into the primary lower oil drainage channel 1023 along the flow channel, and then flow into the primary upper oil drainage channel 1012, and flow into the upper connection 110 together with the oil phase separated by the primary separation structure for collection. The separated water phase flows along the secondary bottom flow port into the space formed by the secondary bottom flow cover 206 and the tertiary upper shell 301, flows along the tertiary upper drainage port 3012 to the tertiary upper drainage channel 3013, and converges with the water phase separated by the secondary separation structure that flows from the secondary upper drainage channel 2013 to the secondary lower drainage channel 2023, and then flows downward into the tertiary upper drainage channel 3013. The oil phase separated by the tertiary separation structure flows out along the tertiary overflow port to the tertiary oil phase deposition plate 305, and then flows into the tertiary upper oil drainage channel 301. 4, flows into the secondary lower oil discharge channel 2024 along the flow channel, and then flows into the secondary upper oil discharge channel 2014, flows into the primary lower oil discharge channel 1023 together with the oil phase separated from the secondary separation part, and then merges with the oil phase separated from the primary separation part in the primary upper oil discharge channel 1012, and then flows into the upper connection 110 together and is lifted to the ground. The separated water phase flows into the space formed by the third-level bottom flow cover 306 and the lower connection 310 along the third-level bottom flow port, and flows from the drainage port 3101 to the bridge channel 311 together with the water phase separated from the primary separation part and the secondary separation part flowing along the third-level upper drainage channel 3013, and finally is discharged from the drainage outlet 3111 to the lower end connection pump structure, and is sucked back into the well through the pump structure; the appearance and cross-sectional view of the primary separation structure are shown in FIG. Figure 3 As shown, the gas-containing oil-water mixture enters the device through the first-level first inlet 1021, enters the first-level three-phase separator 107 and the first-level three-phase small separator 111 along the first-level second inlet 1031 and the first-level small second inlet 1032 respectively for gas-liquid separation, and obtains a sufficient speed for gas-liquid separation after flowing through the flow channel structure of the outer wall of the first-level separation chamber 1071 of the first-level three-phase separator 107 and the first-level three-phase small separator 111. After separation, the gas phase is located in the inner layer close to the first-level degassing cover 1073, enters the interior along the small holes on the first-level degassing cover 1073, and is finally discharged from the degassing port 1046 in the middle of the upper and lower parts of the degassing combination plate 104 along the gas outlet 1013. The oil-water mixture is located in the outer layer close to the first-level gas-liquid separation cylinder 108 and the first-level gas-liquid separation cylinder 112. It flows into the upper part of the degassing assembly plate 104 along the first-level liquid outlet 1043, enters the first-level separation chamber 1071 along the first-level oil-water inlet 1076, flows through the first-level spiral flow channel 1072 for oil-water separation, and after separation, the oil phase is located in the center and flows into the lower end opening of the first-level spiral flow channel 1072, and finally flows out from the first-level overflow port to the oil phase deposition plate 105 and then flows into the first-level upper oil discharge channel 1012, and then flows into the upper connecting oil discharge channel 1101, and is lifted to the ground after being sucked by the pump; the water phase is located in the outer layer close to the inner wall of the first-level separation chamber 1071, flows downward along the first-level bottom flow port 1078 into the space formed by the first-level bottom flow cover 106 and the second-level upper shell 201, and flows into the second-level upper drainage channel 2013 along the second-level upper drainage port 2012; the first-level separation structure explosion diagram is shown as follows Figure 4 As shown; the appearance and cross-sectional view of the secondary separation structure are as follows Figure 5As shown, the gas-containing oil-water mixture enters the device through the secondary inlet 2021, enters the secondary three-phase separator 207 and the secondary three-phase small separator 210 along the secondary second inlet 2031 for gas-liquid separation, and obtains a sufficient speed for gas-liquid separation after flowing through the flow channel structure of the outer wall of the secondary separation chamber 2071 of the secondary three-phase separator 207 and the secondary three-phase small separator 210. After separation, the gas phase resides in the inner layer close to the secondary degassing cover 2073, enters the interior along the small holes on the secondary degassing cover 2073, and finally is discharged into the secondary upper exhaust channel 211 from the middle degassing port of the upper and lower parts of the secondary degassing combination plate 204. Due to the one-way check effect of the secondary Tesla valve 209, the gas phase can only flow upward, and flows into the primary upper exhaust channel 1011 along the primary lower exhaust channel 1022 and then enters the primary separation. The partially separated gas phase is discharged from the device from the gas outlet 1013, and the oil-water mixture is located in the outer layer near the secondary gas-liquid separation cylinder 208 and the secondary gas-liquid small separation cylinder 211, and flows into the upper half of the secondary degassing combination plate 204 along the secondary liquid outlet 2043, and enters the secondary separation chamber 2071, 2101 along the secondary oil-water inlet, and flows through the secondary spiral flow channel 2072 to separate oil and water. After separation, the oil phase is located in the center and flows into the lower end opening of the secondary spiral flow channel 2072, and finally flows out from the secondary overflow port to the secondary oil phase deposition plate 205 and then flows into the secondary upper oil discharge channel 2012, flows along the flow channel into the first lower oil discharge channel 1023, and then flows into the first upper oil discharge channel 1012, and flows into the upper connection 110 together with the partially separated oil phase of the first separation for collection. The water phase is located in the outer layer and flows along the secondary bottom flow outlet into the space formed by the secondary bottom flow cover 206 and the tertiary upper shell 301, flows along the tertiary upper drainage outlet 3012 to the tertiary upper drainage channel 3013, and converges with the water phase separated from the primary separation part flowing from the secondary upper drainage channel 2013 to the secondary lower drainage channel 2023, and then flows downward into the tertiary upper drainage channel 3013; the secondary separation structure explosion diagram is shown in Figure 6 As shown; the appearance and cross-sectional view of the three-stage separation structure are as follows Figure 7As shown, the gas-containing oil-water mixture enters the device through the third-stage inlet 3021, enters the third-stage three-phase separator 307 and the third-stage three-phase small separator 312 along the third-stage second inlet 3031 for gas-liquid separation, and obtains a sufficient speed for gas-liquid separation after flowing through the flow channel structure of the outer wall of the third-stage separation chamber 3071 of the third-stage three-phase separator 307 and the third-stage three-phase small separator 312. After separation, the gas phase is located in the inner layer close to the third-stage degassing cover 3073, and flows along the small on the third-stage degassing cover 3073. The oil-water mixture is located in the outer layer close to the inside of the three-stage gas-liquid separation cylinder 308, flows into the upper part of the three-stage degassing combination plate 304 along the three-stage liquid outlet, enters the inside of the three-stage separation chamber 3071 along the three-stage oil-water inlet, and flows through the three-stage spiral The oil phase is located in the center after the separation and flows into the lower opening of the third-stage spiral flow channel 3072, and finally flows out from the third-stage overflow port to the third-stage oil phase deposition plate 305, and then flows into the third-stage upper oil discharge channel 3014, flows along the flow channel into the second-stage lower oil discharge channel 2024, and then flows into the second-stage upper oil discharge channel 2014, and flows into the first-stage lower oil discharge channel 1023 together with the oil phase separated from the second-stage separation part, and then flows into the first-stage upper oil discharge channel 1012 and separates from the first-stage separation part. The separated oil phases merge and flow into the upper connection 110 for collection; the water phase is located in the outer layer and flows along the third-level bottom flow port into the space formed by the third-level bottom flow cover 306 and the lower connection 310, and flows from the drainage port 3101 to the bridge channel 311 together with the water phase separated from the first separation part and the second separation part flowing along the third-level upper drainage channel 3013, and finally discharged from the drainage outlet 3111 to the lower end connection pump structure, and is sucked back into the well by the pump structure; the explosion diagram of the three-stage separation structure is shown in Figure 8 As shown; the appearance of the combined plate inlet liquid is as follows Fig. 9 As shown; the appearance of the upper connection structure is as shown Fig.10 As shown in (a); the cross-sectional view of the upper connecting oil discharge channel is as follows Fig.10 As shown in (b); the upper and lower views of the degassing assembly plate are as follows Fig.11 As shown in (a) and (b); the cross-sectional view of the degassing assembly plate is shown in Fig.11 As shown in (c) and (d). The parts of the three-phase separator are shown in Fig.12 shown.

[0041] This device greatly enhances the processing capacity of the equipment in the large-displacement working environment of offshore oil fields through the internal layout design combined with multi-stage series single-stage parallel cyclone separators. The parts used in the overall device do not have a complex structure, and can achieve efficient separation of oil, water and gas three-phase media in the narrow space underground. It has a wide range of applications. This device uses cyclone separation technology for underground separation, and can realize dual motors driving dual pumps through the device drive shaft, greatly improving the separation efficiency. It can well meet the working conditions of narrow underground space, has extremely high applicability, greatly improves the recovery rate of the oil field, and injects the separated water back into the well, avoiding energy loss caused by lifting water, enhancing the economy of the production system, and reducing the operating pressure of subsequent separation equipment.

Claims

1. A downhole oil-gas-water three-phase efficient separation device suitable for ultra-high liquid production oil wells, characterized by: The device comprises a combined shell and a multi-stage separation structure. The upper end of the combined shell is connected to an upper connection, the lower end of the combined shell is connected to a lower connection, and the lower end of the lower connection is connected to a bridge channel. The multi-stage separation structure is arranged in the combined shell. The combined shell is formed by sequentially connecting graded shells. An oil discharge channel, an exhaust channel, and a water discharge channel are arranged in the wall of the combined shell. The multi-stage separation structure is composed of separation structures of various stages connected in series in the combined shell from top to bottom. Each separation structure of each stage is connected to the oil discharge channel, the exhaust channel, and the water discharge channel. The oil phase is discharged through the upper connection, and the water phase is discharged through the bridge channel. An air outlet is arranged at the upper end of the exhaust channel, and the air outlet is arranged on the combined shell. The gas phase is discharged from the air outlet. Each separation structure of each stage has a graded shell and a graded three-phase separator group. The graded shell is formed by threaded connection of an upper shell and a lower shell. The lower shell is provided with a graded first inlet. The graded three-phase separator group comprises a plurality of parallel three-phase separators, an oil phase deposition plate, a degassing plate, and a degassing plate. A gas combination plate, a gas-liquid separation cylinder, a combination orifice plate, and an underflow cover. An oil phase deposition plate is arranged above the degassing combination plate. The degassing combination plate and the oil phase deposition plate are arranged at intervals. The combination orifice plate is threadedly connected to the upper part of the lower shell. The combination orifice plate is provided with a plurality of through holes. The lower inner wall of each through hole has a step. A second inlet is evenly arranged on each step. A gas-liquid separation cylinder is threadedly connected to the upper end of each through hole to form a separator cylinder. A three-phase separator is arranged in each separator cylinder. The outer spiral flow channel of the three-phase separator is above the second inlet. The upper overflow port of each three-phase separator is connected to an overflow connection port of the oil phase deposition plate. The air outlet of each three-phase separator is connected to the air outlet hole of the degassing combination plate. The oil-water inlet of each three-phase separator is connected to the third inlet of the degassing combination plate. The lower underflow port of each three-phase separator is connected to one of the through holes of the underflow cover. The cavity between the oil and gas deposition plate and the upper shell is connected to the oil discharge channel. The degassing combined plate is composed of an upper plate and a lower plate arranged on the outer edge of the central column, the upper plate and the lower plate are respectively connected to the upper shell with threads, the lower plate is evenly arranged with a plurality of air outlets around the central column, an annular cavity is formed between the upper plate and the lower plate, the annular cavity is respectively communicated with the air outlet and the air outlet, the upper surface of the upper plate and the central column form an annular liquid tank, the upper plate is also evenly arranged with a plurality of third inlets around the central column, the third inlet is communicated with the annular liquid tank, the center of the central column is arranged with a third inlet, an intermediate cavity, and an air outlet that are communicated with each other from top to bottom, the intermediate cavity is communicated with the annular cavity, and the central column is also evenly arranged with a plurality of liquid outlets; The three-phase separator comprises a separation chamber, a degassing hood, an inner spiral flow channel, and a connecting cover. The upper part of the separation chamber is provided with an outer spiral flow channel. The separation chamber below the outer spiral flow channel is a cone cylinder, the lower port of the cone cylinder is a bottom flow port, the inner spiral flow channel is located in the separation chamber and on the cone cylinder, and an overflow pipe is provided at the center of the inner spiral flow channel; the connecting cover is clamped on the upper port of the separation chamber, the degassing hood is clamped on the connecting cover, the lower end of the degassing hood is a cone cylinder with holes, and the cone cylinder is above the air outlet cylinder, the upper end air outlet of the air outlet cylinder is threadedly connected with the air outlet hole of the degassing combination plate, the oil-water pipe of the connecting cover passes through the degassing hood and is threadedly connected with the third inlet of the degassing combination plate, the overflow pipe of the inner spiral flow channel passes through the oil-water pipe and is threadedly connected with the overflow connecting port of the oil phase deposition plate; the annulus between the overflow pipe and the oil-water pipe is an oil-water channel, and the annulus between the oil-water pipe and the air outlet cylinder is an air outlet channel.

2. The downhole oil-gas-water three-phase efficient separation device for ultra-high liquid production oil wells according to claim 1 is characterized in that: The multi-stage separation structure has three stages, namely, a primary separation structure, a secondary separator structure, and a tertiary separation structure; the primary upper shell of the primary separation structure is threadedly connected to the upper connection through a connector at the upper end of the shell top, and the upper connection is also provided with an oil discharge channel, through which the oil phase is discharged.

3. The downhole oil-gas-water three-phase efficient separation device for ultra-high liquid production oil wells according to claim 2 is characterized in that: The lower end of the separation lower shell of the three-stage separation structure is threadedly connected to the upper end of the lower connection, the lower end of the lower connection is threadedly connected to the bridge channel, a plurality of drainage holes are distributed in the lower connection, the upper end of each drainage hole is connected to the bottom flow outlet, the lower end of each drainage outlet is communicated with the drainage cavity in the lower connection, the lower end of the drainage cavity is threadedly connected to the bridge channel, the bridge channel has a drainage outlet, and the separated water is discharged through the drainage outlet.

4. The downhole oil-gas-water three-phase efficient separation device for ultra-high liquid production oil wells according to claim 3 is characterized in that: The primary separation structure, the secondary separator structure, and the tertiary separation structure all have five parallel three-phase separators, one small three-phase separator is centrally arranged, and the other four three-phase separators are large three-phase separators, which are evenly arranged around the small three-phase separator.

5. The downhole oil-gas-water three-phase efficient separation device for ultra-high liquid production oil wells according to claim 4 is characterized in that: A Tesla valve is arranged in the oil discharge channel arranged in the wall of the combined shell, a Tesla valve is arranged in the exhaust channel arranged in the wall of the combined shell, and a Tesla valve is arranged in the drainage channel arranged in the wall of the combined shell.

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