Same-well jet flow production and injection device and using method

Abstract

The invention relates to the technical field of oil and gas field development injection and production engineering, in particular to a same-well jet flow production and injection device and a using method. According to the technical scheme, a jet oil-well pump is connected to a ground wellhead through an oil pipe and a small-diameter oil pipe, a throwing and fishing pump core is arranged in the jet oil-well pump, the lower portion of the jet oil-well pump is connected with a jet water injection pump through an oil blocking water filter, and a mixed liquid outlet pipe is located on a water injection layer below a packer; one part of high-pressure power liquid pumped into the ground enters the jet flow oil well pump and ejects and pumps low-water-content crude oil to the ground; and the residual high-pressure power liquid passes through a throwing and fishing pump core in the jet flow oil well pump to enter the jet flow water injection pump, and injects and sucks the formation water which is deoiled and filtered by the oil blocking water filter to be injected into a water injection layer. The device has the advantages of being simple in structure, low in failure rate, reliable in operation, long in pump inspection period, convenient to wash wells and inspect pumps, capable of saving investment and operation cost, more suitable for highly-deviated wells, dense wells in the middle and later periods of exploitation, and capable of meeting the essential requirements of multi-layer layered injection-production development in the high water cut period and energy conservation and consumption reduction.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development injection and production engineering, and in particular to a same-well jet production and injection device and a use method thereof. Background Art

[0002] For multi-layer reservoirs, in order to improve the production speed and efficiency, the same-well production and injection string is used, which can realize the simultaneous injection and production of one well, effectively reduce the injection and production costs and improve the production efficiency. The existing same-well injection and production process strings, especially the upper injection and lower strings of the same-well production, are mostly injection and production systems composed of downhole two-stage submersible electric pumps and downhole separators. It is necessary to set up a special downhole oil-water separation device to separate the water in the production fluid by cyclone and then inject it into the water injection layer of the same well. The separation effect is difficult to be stable due to the restriction of the cyclone speed. The downhole device structure is complex and the coordination of the two sets of electric pump injection and production systems is difficult. In addition, the two-stage submersible electric pumps in the same well also have complex string structures, high investment, high pump inspection operation costs, and are difficult to apply to downhole corrosion, scaling, sand production, high gas-oil ratio, and high-angle well conditions. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned defects in the prior art and to provide a same-well jet production and injection device and a method of use. By adopting a two-stage jet pump consisting of a jet oil pump and a jet water injection pump, oil production in the upper layer and water injection in the lower layer of the same well are achieved. The device has a simple structure, a low failure rate, reliable operation, a long pump inspection cycle, is easy to clean the well and inspect the pump, reduces the workload of production liquid lifting and ground processing, and saves investment and operating costs.

[0004] The present invention mentions a same-well jet production and injection device, whose technical solution is: including a packer, which is installed between the oil-producing layer and the water injection layer in the well, and also includes a small-diameter oil pipe, a jet oil pump, a jet water injection pump and an oil-blocking water filter. The jet oil pump is connected to the wellhead on the ground through the oil pipe and the small-diameter oil pipe, and a pump core that can be cast and salvaged is installed in the jet oil pump. The oil-blocking water filter is connected to the jet oil pump through the oil pipe below, and the oil-blocking water filter is connected to the jet water injection pump through the oil pipe below. The mixed liquid outlet pipe of the jet water injection pump is located in the packer. The water injection layer below; the high-pressure power fluid injected from the ground goes down through the small-diameter oil pipe, and a part of it enters the jet oil pump and draws out the low-water-content crude oil in the annular space between the oil pipe and the casing, and then rises to the ground along the annular space between the oil pipe and the small-diameter oil pipe; the remaining high-pressure power fluid passes through the castable pump core in the jet oil pump and the oil pipe connected below and continues to go down into the jet water injection pump, draws out and draws out the formation water that has been filtered and deoiled by the oil-blocking water filter, and the formed mixed water is injected into the water injection layer through the mixed liquid outlet pipe and the oil pipe below, realizing injection and production in the same well.

[0005] Preferably, the above-mentioned jet oil pump adopts a double-tube positive circulation jet oil pump, including a pump barrel, a nozzle section, a formation fluid inlet, a throat section, a salvageable pump core, a diffusion section, and a pump core seat. The middle part of the pump barrel is provided with a formation fluid inlet connected to the throat section, and above the throat section is the nozzle section. The nozzle section is an annular structure formed by the salvageable pump core and the inner wall of the pump barrel, the lower part of the throat section is the diffusion section, and the lower end outlet of the diffusion section is connected to the mixed liquid outlet cavity; a pump core seat is installed in the lower part of the inner cavity of the pump barrel, and the salvageable pump core is supported by the pump core seat, and a lateral liquid inlet is provided on the top of the salvageable pump core.

[0006] Preferably, the mixed liquid outlet chamber is an arc-shaped cavity structure, located on the inner wall of the pump barrel, and is not connected to the formation fluid inlet. The mixed liquid outlet chamber is connected upward along the outer wall of the pump barrel with the annulus formed by the inner pipe and the outer pipe, so that the mixed liquid continues to ascend along the annulus of the oil pipe and the small-diameter oil pipe to be produced on the ground.

[0007] Preferably, the above-mentioned salvageable pump core includes a pump core body, a salvaging head, a conical socket head, an oblique liquid inlet, and a lateral liquid inlet. The top of the pump core body is provided with a salvaging head, and the lower end is provided with a conical socket head, which is connected to the pump core seat through the conical socket head; the upper part of the pump core body is provided with a plurality of lateral liquid inlets, and the lower side of the salvaging head is provided with a plurality of oblique liquid inlets, so that the high-pressure power fluid is divided into two parts, one part is sprayed out along the annular structure formed by the salvageable pump core and the inner wall of the pump barrel, and the other part enters the inner cavity of the pump core body along the oblique liquid inlet and the lateral liquid inlet.

[0008] Preferably, the above-mentioned jet water injection pump adopts a downhole jet water injection pump, which includes a pump body, a pump body upper joint, a salvageable nozzle, a throat, a power fluid pump inlet, a water suction port, and a mixed liquid outlet. The upper end of the pump body is connected to the pump body upper joint, and the top of the pump body upper joint is provided with a power fluid pump inlet, and the salvageable nozzle is installed in the inner cavity of the pump body upper joint; the upper side of the pump body is provided with a water suction port, and the inner cavity of the pump body is provided with a throat, the lower side of the throat is a diffusion chamber, and the lower end of the pump body is provided with a mixed liquid outlet.

[0009] Preferably, a sealing ring is installed at the lower end of the pump body upper joint, and a set screw is installed on the upper wall of the pump body, and the pump body and the pump body upper joint are connected and locked by the set screw.

[0010] Preferably, the above-mentioned salvageable nozzle includes a salvageable nozzle body, a nozzle salvaging head, a nozzle liquid inlet, a nozzle body support part, and a nozzle. The top of the salvageable nozzle body is provided with a nozzle salvaging head, the inner cavity of the salvageable nozzle body is a hollow structure, and the nozzle liquid inlet is provided on the lower side of the nozzle salvaging head. The middle and lower part of the salvageable nozzle body is a nozzle body support part with a conical structure, which is used to support the salvageable nozzle body through the nozzle body support part contacting the conical inner wall of the middle and lower part of the upper joint of the pump body; the lower end of the salvageable nozzle body is provided with a nozzle.

[0011] Preferably, the above-mentioned oil-blocking water filter includes a central tube, a central screen tube, an upper protective ring, an upper fixed ring, a multi-layer water-filtering and oil-blocking elastic screen, an oil-blocking and water-blocking filter material, a lower fixed ring, a leather cup seal, and a guide hole. The central tube is installed in the inner cavity of the central screen tube, and the oil-blocking and water-blocking filter material is installed on the outer wall of the central screen tube. The outer side of the oil-blocking and water-blocking filter material is provided with a multi-layer water-filtering and oil-blocking elastic screen, and the lower ends of the oil-blocking and water-blocking filter material and the multi-layer water-filtering and oil-blocking elastic screen are fixed by the lower fixed ring, and the upper ends are fixed by the upper protective ring and the upper fixed ring. A leather cup seal is provided on the lower side of the central screen tube, and a guide hole is provided at the lower part of the central screen tube.

[0012] Preferably, the outer diameter of the above-mentioned central pipe is smaller than the inner diameter of the central screen pipe, and an annulus is formed between the central pipe and the central screen pipe. The oil-water mixture passes through multiple layers of water-filtering and oil-blocking elastic screens and oil-blocking and water-filtering filter materials and enters the annulus between the central pipe and the central screen pipe, then flows out through the guide holes, and is then injected into the water injection layer through a jet water injection pump.

[0013] The method for using the same-well jet injection device mentioned in the present invention comprises the following steps: (I) Lower the same-well jet injection and production device into the well, start the surface high-pressure water injection pump, first wash the well forward to clean out the stored liquid in the wellbore, and then introduce the same-well jet injection and production process. The high-pressure power fluid goes down through the small-diameter oil pipe into the jet pump and draws and sucks the low-water-content crude oil in the annular space between the oil pipe and the casing, and then rises to the ground along the annular space between the oil pipe and the small-diameter oil pipe; the remaining high-pressure power fluid passes through the salvageable pump core in the jet pump and the oil pipe connected below and continues to go down into the jet injection pump, draws and sucks the formation water that has been deoiled and filtered by the oil-blocking water filter, and the formed mixed water is injected into the water injection layer through the mixed liquid outlet pipe and the oil pipe below, so as to realize the same-well oil production and water injection functions; (ii) When the jet pump needs to be inspected and replaced, a salvage device connected by a steel wire is lowered into the small-diameter oil pipe to pull out the salvageable pump core. After inspection, the repaired salvageable pump core is lowered into the well through the small-diameter oil pipe to resume injection and production without the need for well repair equipment; When it is necessary to replace and overhaul the retrievable nozzle in the lower jet water injection pump, firstly remove the retrievable pump core in the jet oil pump, then lower the retrievable nozzle of the jet water injection pump into the well for overhaul and replacement, and then put it into the well from the small-diameter oil pipe after overhaul. The outer diameter of the retrievable pump core of the upper jet oil pump is larger than the outer diameter of the retrievable nozzle of the lower jet water injection pump to ensure the smooth lifting and lowering of the retrievable nozzle; (III) Well washing operation: After a period of injection and production in the same well, when the annular space of the oil pipe and casing at the bottom of the wellbore and the outer wall of the oil-blocking water filter need to be cleaned of oil and the cleanliness of the injected water is increased, first stop injecting high-pressure power fluid and close the annular wellhead gates of the small-diameter oil pipe and the ground wellhead, open the casing gate, and use the high-pressure return water of the injection layer to flush the oil-blocking water filter and the oil on the inner wall of the annular space of the oil pipe and casing to perform backwashing operations to wash the blockages and oil out of the ground.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention utilizes a two-stage jet pump of a jet oil pump and a jet water injection pump to realize upper layer oil production and lower layer water injection in the same well. Compared with the existing submersible electric pump and other pumping and injection systems, the present invention has a simple structure, no relatively moving parts, low failure rate, reliable operation, long pump inspection cycle, convenient well washing and pump inspection, reduced production liquid lifting and ground processing workload, saved investment and operation costs, realized dual-use of injection and production in one well, and is more suitable for high-angle wells, wells with dense wells in the middle and late stages of mining, multi-layered injection and production development in the high water content period, and energy saving and consumption reduction. Second, the present invention utilizes the relatively long annular space of the oil casing between the oil-producing layer and the water-injection layer and its high temperature conditions as an oil-water gravity separator, and uses a water filter and oil stopper as a fine oil remover for the injected water to assist in purifying the water quality. Compared with other types of downhole oil-water separators, the present invention has a simple structure, good oil-water separation effect, reliable operation, energy saving, environmental protection, and economical applicability; 3. The ring-jet oil pump and the jet water injection pump with a salvageable nozzle of the present invention have novel and convenient structures. The double pumps can be inspected and the nozzles can be replaced without moving the pipe column, and the operation and management are convenient. The streamlined flow channel fluid inside greatly reduces the hydraulic friction resistance, ensuring a higher pump efficiency and good anti-scaling effect. The pipe column structure of the present invention has the functions of backwashing wells and self-cleaning oil-blocking water filter, and it is easy to operate and reliable in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the jet oil pump; Figure 3 yes Figure 2 AA cross-section diagram of ; Figure 4 It is a schematic diagram of the structure of a pump core that can be cast and salvaged; Figure 5 It is a schematic diagram of the structure of the jet water injection pump; Figure 6 It is a schematic diagram of the structure of the nozzle that can be cast and fished; Figure 7 It is a structural schematic diagram of the oil-blocking water filter; In the figure above: small diameter oil pipe 1, oil pipe 2, jet oil pump 3, jet water injection pump 4, oil blocking water filter 5, packer 6, oil production layer 7, water injection layer 8, casing 9, pump barrel 3.1, nozzle section 3.2, formation fluid inlet 3.3, throat section 3.4, salvageable pump core 3.5, diffusion section 3.6, pump core seat 3.7, inner pipe 3.8, outer pipe 3.9, mixed liquid outlet cavity 3.10, pump core body 3.5.1, salvage head 3.5.2, tapered socket 3.5.3, oblique liquid inlet 3.5.4, lateral liquid inlet 3.5.5, pump body 4.1, pump body upper joint 4.2, The salvageable nozzle 4.3, the throat 4.4, the power fluid inlet 4.5, the water suction port 4.6, the mixed liquid outlet 4.7, the set screw 4.8, the sealing ring 4.9, the salvageable nozzle body 4.3.1, the nozzle salvaging head 4.3.2, the nozzle liquid inlet 4.3.3, the nozzle body support part 4.3.4, the nozzle 4.3.5, the center pipe 5.1, the center screen pipe 5.2, the oil pipe coupling 5.3, the upper guard ring 5.4, the upper fixing ring 5.5, the multi-layer water filtering and oil blocking elastic screen 5.6, the oil blocking and water filtering filter material 5.7, the lower fixing ring 5.8, the leather cup seal 5.9, and the diversion hole 5.10. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0017] Example 1, reference Figure 1-Figure 7 The present invention mentions a same-well jet production and injection device, including a packer 6, which is installed between the oil-producing layer 7 and the water injection layer 8 in the well, and also includes a small-diameter oil pipe 1, a jet oil pump 3, a jet water injection pump 4 and an oil-blocking water filter 5. The jet oil pump 3 is connected to the wellhead on the ground through the oil pipe 2 and the small-diameter oil pipe 1, and a pump core 3.5 that can be cast and salvaged is installed in the jet oil pump 3. The oil-blocking water filter 5 is connected to the jet oil pump 3 through the oil pipe 2 below, and the oil-blocking water filter 5 is connected to the jet water injection pump 4 through the oil pipe 2 below. The mixed liquid outlet pipe of the jet water injection pump 4 is located in the packer. 6 below the water injection layer 8; the high-pressure power fluid pumped into the ground goes down through the small-diameter oil pipe 1, and a part of it enters the jet oil pump 3 and draws and sucks the low-water-content crude oil in the annular space between the oil pipe 2 and the casing 9, and then rises to the ground along the annular space of the oil pipe 2 and the small-diameter oil pipe 1; the remaining high-pressure power fluid passes through the salvageable pump core 3.5 in the jet oil pump 3 and the oil pipe 2 connected below and continues to go down into the jet water injection pump 4, draws and sucks the formation water that has been deoiled and filtered by the oil-blocking water filter 5, and the formed mixed water is injected into the water injection layer 8 through the mixed liquid outlet pipe and the oil pipe 2 below, so as to realize injection and production in the same well.

[0018] Reference Figure 2-Figure 4The jet oil pump 3 mentioned in the present invention adopts a double-tube positive circulation jet oil pump, including a pump barrel 3.1, a nozzle section 3.2, a formation fluid inlet 3.3, a throat section 3.4, a salvageable pump core 3.5, a diffusion section 3.6, and a pump core seat 3.7. The middle part of the pump barrel 3.1 is provided with a formation fluid inlet 3.3 connected to the throat section 3.4, and the nozzle section 3.2 is above the throat section 3.4. The nozzle section 3.2 is an annular structure formed by the salvageable pump core 3.5 and the inner wall of the pump barrel 3.1. The lower part of the throat section 3.4 is the diffusion section 3.6, and the lower end outlet of the diffusion section 3.6 is connected to the mixed liquid outlet chamber 3.10; a pump core seat 3.7 is installed at the lower part of the inner cavity of the pump barrel 3.1, and the salvageable pump core 3.5 is received through the pump core seat 3.7, and a lateral liquid inlet 3.5.5 is provided on the top of the salvageable pump core 3.5.

[0019] Among them, the above-mentioned mixed liquid outlet chamber 3.10 is an arc-shaped cavity structure, located on the inner wall of the pump barrel 3.1, and is not connected with the formation fluid inlet 3.3. The mixed liquid outlet chamber 3.10 is connected with the annulus formed by the inner pipe 3.8 and the outer pipe 3.9 upward along the outer wall of the pump barrel 3.1, so that the mixed liquid continues to go up along the annulus of the oil pipe 2 and the small-diameter oil pipe 1 to be produced on the ground.

[0020] Reference Figure 4 The salvageable pump core 3.5 mentioned in the present invention comprises a pump core body 3.5.1, a salvage head 3.5.2, a conical socket head 3.5.3, an oblique liquid inlet 3.5.4 and a lateral liquid inlet 3.5.5. The top of the pump core body 3.5.1 is provided with a salvage head 3.5.2, and the lower end is provided with a conical socket head 3.5.3, which is connected with the pump core seat 3.7 through the conical socket head 3.5.3; a plurality of lateral liquid inlets 3.5.5 are provided on the upper part of the pump core body 3.5.1, and a plurality of oblique liquid inlets 3.5.4 are provided on the lower side of the salvage head 3.5.2, so that the high-pressure power fluid is divided into two parts, one part is sprayed out along the annular structure formed by the salvageable pump core 3.5 and the inner wall of the pump barrel 3.1, and the other part enters the inner cavity of the pump core body 3.5.1 along the oblique liquid inlet 3.5.4 and the lateral liquid inlet 3.5.5.

[0021] Reference Figure 5 The jet water injection pump 4 mentioned in the present invention adopts a downhole jet water injection pump, which includes a pump body 4.1, a pump body upper joint 4.2, a scoopable nozzle 4.3, a throat 4.4, a power liquid pump inlet 4.5, a water suction port 4.6, and a mixed liquid outlet 4.7. The upper end of the pump body 4.1 is connected to the pump body upper joint 4.2, and the top of the pump body upper joint 4.2 is provided with a power liquid pump inlet 4.5, and the scoopable nozzle 4.3 is installed in the inner cavity of the pump body upper joint 4.2; the upper side of the pump body 4.1 is provided with a water suction port 4.6, and the inner cavity of the pump body 4.1 is provided with a throat 4.4, the lower side of the throat 4.4 is a diffusion cavity, and the lower end of the pump body 4.1 is provided with a mixed liquid outlet 4.7.

[0022] A sealing ring 4.9 is installed at the lower end of the pump body upper joint 4.2, and a set screw 4.8 is installed on the upper wall of the pump body 4.1, and the pump body 4.1 is connected and locked with the pump body upper joint 4.2 by the set screw 4.8.

[0023] Reference Figure 6 The salvageable nozzle 4.3 mentioned in the present invention comprises a salvageable nozzle body 4.3.1, a nozzle salvaging head 4.3.2, a nozzle liquid inlet 4.3.3, a nozzle body support portion 4.3.4, and a nozzle 4.3.5. The top of the salvageable nozzle body 4.3.1 is provided with a nozzle salvaging head 4.3.2, the inner cavity of the salvageable nozzle body 4.3.1 is a hollow structure, and a nozzle liquid inlet 4.3.3 is provided on the lower side of the nozzle salvaging head 4.3.2, the middle and lower part of the salvageable nozzle body 4.3.1 is a nozzle body support portion 4.3.4 with a conical structure, which is used to support the salvageable nozzle body 4.3.1 through the nozzle body support portion 4.3.4 and the conical inner wall of the middle and lower part of the pump body upper joint 4.2 is contacted; the lower end of the salvageable nozzle body 4.3.1 is provided with a nozzle 4.3.5.

[0024] Reference Figure 7 The oil-blocking water filter 5 mentioned in the present invention comprises a central tube 5.1, a central screen tube 5.2, an oil pipe coupling 5.3, an upper protective ring 5.4, an upper fixing ring 5.5, a multi-layer water-filtering and oil-blocking elastic screen 5.6, an oil-blocking and water-filtering filter material 5.7, a lower fixing ring 5.8, a leather cup seal 5.9, and a flow guide hole 5.10. The central tube 5.1 is installed in the inner cavity of the central screen tube 5.2, and the oil-blocking and water-filtering filter material 5.7 is installed on the outer wall of the central screen tube 5.2. .7 is provided with a multi-layer water-filtering and oil-blocking elastic screen 5.6 on the outside, and the lower ends of the oil-blocking and water-filtering filter material 5.7 and the multi-layer water-filtering and oil-blocking elastic screen 5.6 are fixed by a lower fixing ring 5.8, and the upper ends are fixed by an upper protective ring 5.4 and an upper fixing ring 5.5. A leather cup seal 5.9 is provided on the lower side of the central screen tube 5.2, and a guide hole 5.10 is provided on the lower part of the central screen tube 5.2. The top of the central screen tube 5.2 is connected to the upper oil pipe 2 through an oil pipe coupling 5.3.

[0025] Among them, the outer diameter of the above-mentioned central pipe 5.1 is smaller than the inner diameter of the central screen pipe 5.2, and an annulus is formed between the central pipe 5.1 and the central screen pipe 5.2. The oil-water mixture passes through the multi-layer water-filtering and oil-blocking elastic screen 5.6 and the oil-blocking and water-filtering filter material 5.7 and enters the annulus between the central pipe 5.1 and the central screen pipe 5.2, then flows out through the guide hole 5.10, and is then injected into the water injection layer 8 through the jet water injection pump 4.

[0026] The method for using the same-well jet injection device mentioned in the present invention comprises the following steps: (i) Lower the same-well jet injection and production device into the well, start the surface high-pressure water injection pump, first wash the well forward to clean out the stored liquid in the wellbore, and then introduce the same-well jet injection and production process. The high-pressure power fluid descends through the small-diameter oil pipe 1 into the jet pump 3 and draws and sucks the low-water-content crude oil in the annular space between the oil pipe 2 and the casing 9, and then rises to the ground along the oil pipe 2 and the annular space of the small-diameter oil pipe 1; the remaining high-pressure power fluid passes through the salvageable pump core 3.5 in the jet pump 3 and the oil pipe 2 connected below and continues to descend into the jet injection pump 4, draws and sucks the formation water that has been deoiled and filtered by the oil-blocking water filter 5, and the formed mixed water is injected into the water injection layer 8 through the mixed liquid outlet pipe and the oil pipe 2 below, thereby realizing the same-well oil production and water injection functions; (ii) When the jet oil pump 3 needs to be inspected and replaced, a fishing device connected with a steel wire is lowered into the small-diameter oil pipe 1 to pull out the salvageable pump core 3.5. After inspection, the repaired salvageable pump core 3.5 is lowered into the well from the small-diameter oil pipe 1 to resume injection and production without the need for well repair equipment; When it is necessary to replace and overhaul the retrievable nozzle 4.3 in the lower jet water injection pump 4, firstly remove the retrievable pump core 3.5 in the jet oil pump 3, then lower a salvage device connected with a steel wire to salvage the retrievable nozzle 4.3 of the jet water injection pump 4 into the well for overhaul and replacement, and after overhaul, lower it into the well from the small-diameter oil pipe 1. The outer diameter of the retrievable pump core 3.5 of the upper jet oil pump 3 is larger than the outer diameter of the retrievable nozzle 4.3 of the lower jet water injection pump 4, so as to ensure the smooth lifting and lowering of the retrievable nozzle 4.3; (III) Well washing operation: After a period of injection and production in the same well, when the annular space of the oil pipe 2 and casing 9 at the bottom of the wellbore and the outer wall of the oil-blocking water filter 5 need to be cleaned of oil and the cleanliness of the injected water is increased, the injection of high-pressure power fluid is stopped first, and the annular wellhead gates of the small-diameter oil pipe 1 and the ground wellhead are closed, and the casing gate is opened. The high-pressure return water of the injection layer 8 is then used to wash the oil-blocking water filter 5 and the inner wall of the annular space of the oil pipe 2 and casing 9 to perform backwashing operations, thereby washing the blockages and oil out of the ground.

[0027] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A jet production and injection device in the same well, comprising a packer (6), wherein the packer (6) is installed between an oil production layer (7) and a water injection layer (8) in the well, and wherein: The invention also comprises a small-diameter oil pipe (1), a jet oil pump (3), a jet water injection pump (4) and an oil-blocking water filter (5); the jet oil pump (3) is connected to the wellhead on the ground through the oil pipe (2) and the small-diameter oil pipe (1); a retrievable pump core (3.5) is arranged in the jet oil pump (3); the lower part of the jet oil pump (3) is connected to the oil-blocking water filter (5) through the oil pipe (2); the lower part of the oil-blocking water filter (5) is connected to the jet water injection pump (4) through the oil pipe (2); the mixed liquid outlet pipe of the jet water injection pump (4) is located in the water injection layer (8) below the packer (6); the high-pressure power fluid injected into the ground is discharged through the oil pipe (2) and ... The small-diameter oil pipe (1) moves downward, and a portion of it enters the jet pump (3) and draws and sucks the low-water-content crude oil in the annular space between the oil pipe (2) and the casing (9), and then rises to the ground along the annular space between the oil pipe (2) and the small-diameter oil pipe (1); the remaining high-pressure power fluid passes through the salvageable pump core (3.5) in the jet pump (3) and the oil pipe (2) connected below, and continues to move downward into the jet water injection pump (4), draws and sucks the formation water that has been filtered and deoiled by the oil-blocking water filter (5), and the formed mixed water is injected into the water injection layer (8) through the mixed liquid outlet pipe and the oil pipe (2) below, thereby realizing injection and production in the same well.

2. The same well jet injection device according to claim 1 is characterized in that: The jet oil pump (3) adopts a double-tube positive circulation jet oil pump, comprising a pump barrel (3.1), a nozzle section (3.2), a formation fluid inlet (3.3), a throat section (3.4), a salvageable pump core (3.5), a diffusion section (3.6), and a pump core seat (3.7). The middle of the pump barrel (3.1) is provided with a formation fluid inlet (3.3) connected to the throat section (3.4). Above the throat section (3.4) is the nozzle section (3.2). The nozzle section (3.2) The invention relates to an annular structure formed by a salvageable pump core (3.5) and the inner wall of a pump barrel (3.1); the lower part of the throat section (3.4) is a diffusion section (3.6); the lower end outlet of the diffusion section (3.6) is connected to a mixed liquid outlet chamber (3.10); a pump core seat (3.7) is installed at the lower part of the inner cavity of the pump barrel (3.1); the salvageable pump core (3.5) is received by the pump core seat (3.7); and a lateral liquid inlet (3.5.5) is provided at the top of the salvageable pump core (3.5).

3. The same well jet injection device according to claim 2 is characterized in that: The mixed liquid outlet chamber (3.10) is an arc-shaped chamber structure, located on the inner wall of the pump barrel (3.1) and not connected to the formation fluid inlet (3.3). The mixed liquid outlet chamber (3.10) is connected upward along the outer wall of the pump barrel (3.1) to the annulus formed by the inner tube (3.8) and the outer tube (3.9), so that the mixed liquid continues to flow upward along the annulus of the oil pipe (2) and the small-diameter oil pipe (1) to be produced on the ground.

4. The same well jet injection device according to claim 3 is characterized in that: The salvageable pump core (3.5) comprises a pump core body (3.5.1), a salvage head (3.5.2), a conical socket head (3.5.3), an oblique liquid inlet (3.5.4), and a lateral liquid inlet (3.5.5); the top of the pump core body (3.5.1) is provided with a salvage head (3.5.2), and the lower end is provided with a conical socket head (3.5.3), which is connected to the pump core seat (3.7) through the conical socket head (3.5.3); the pump core A plurality of lateral liquid inlets (3.5.5) are provided on the upper part of the main body (3.5.1), and a plurality of oblique liquid inlets (3.5.4) are provided on the lower side of the salvaging head (3.5.2), so that the high-pressure power fluid is divided into two parts, one part is sprayed out along the annular structure formed by the salvageable pump core (3.5) and the inner wall of the pump barrel (3.1), and the other part enters the inner cavity of the pump core main body (3.5.1) along the oblique liquid inlet (3.5.4) and the lateral liquid inlet (3.5.5).

5. The same well jet injection device according to claim 4 is characterized in that: The jet water injection pump (4) adopts a downhole jet water injection pump, and the downhole jet water injection pump comprises a pump body (4.1), a pump body upper joint (4.2), a dredgeable nozzle (4.3), a throat (4.4), a power liquid pump inlet (4.5), a water suction port (4.6), and a mixed liquid outlet (4.7). The upper end of the pump body (4.1) is connected to the pump body upper joint (4.2), the top of the pump body upper joint (4.2) is provided with a power liquid pump inlet (4.5), and the dredgeable nozzle (4.3) is installed in the inner cavity of the pump body upper joint (4.2); the upper side of the pump body (4.1) is provided with a water suction port (4.6), the inner cavity of the pump body (4.1) is provided with a throat (4.4), the lower side of the throat (4.4) is a diffusion cavity, and the lower end of the pump body (4.1) is provided with a mixed liquid outlet (4.7).

6. The same well jet injection device according to claim 5 is characterized in that: A sealing ring (4.9) is installed at the lower end of the pump body upper joint (4.2), and a set screw (4.8) is installed on the upper wall of the pump body (4.1), and the pump body (4.1) and the pump body upper joint (4.2) are connected and locked by the set screw (4.8).

7. The same well jet injection device according to claim 6 is characterized in that: The salvageable nozzle (4.3) comprises a salvageable nozzle body (4.3.1), a nozzle salvaging head (4.3.2), a nozzle liquid inlet (4.3.3), a nozzle body support portion (4.3.4), and a nozzle (4.3.5). The top of the salvageable nozzle body (4.3.1) is provided with a nozzle salvaging head (4.3.2). The inner cavity of the salvageable nozzle body (4.3.1) is a hollow structure, and a nozzle liquid inlet (4.3.3) is provided on the lower side of the nozzle salvaging head (4.3.2). The middle and lower part of the salvageable nozzle body (4.3.1) is a nozzle body support portion (4.3.4) with a conical structure, and the nozzle body support portion (4.3.4) contacts the conical inner wall of the middle and lower part of the pump body upper joint (4.2) to support the salvageable nozzle body (4.3.1); the lower end of the salvageable nozzle body (4.3.1) is provided with a nozzle (4.3.5).

8. The same well jet injection device according to claim 7 is characterized in that: The oil-blocking water filter (5) comprises a central tube (5.1), a central screen tube (5.2), an upper protective ring (5.4), an upper fixing ring (5.5), a multi-layer water-filtering and oil-blocking elastic screen (5.6), an oil-blocking and water-filtering filter material (5.7), a lower fixing ring (5.8), a leather cup seal (5.9), and a flow guide hole (5.10). The central tube (5.1) is installed in the inner cavity of the central screen tube (5.2), and the oil-blocking and water-filtering filter material (5.7) is installed on the outer wall of the central screen tube (5.2). .7), a multi-layer water-filtering and oil-blocking elastic screen (5.6) is provided on the outer side of the oil-blocking and water-filtering filter material (5.7), and the lower ends of the oil-blocking and water-filtering filter material (5.7) and the multi-layer water-filtering and oil-blocking elastic screen (5.6) are fixed by a lower fixing ring (5.8), and the upper ends are fixed by an upper protective ring (5.4) and an upper fixing ring (5.5), a leather cup seal (5.9) is provided on the lower side of the central screen tube (5.2), and a guide hole (5.10) is provided at the lower part of the central screen tube (5.2).

9. The same well jet injection device according to claim 8, characterized in that: The outer diameter of the central pipe (5.1) is smaller than the inner diameter of the central screen pipe (5.2), and an annulus is formed between the central pipe (5.1) and the central screen pipe (5.2). The oil-water mixture passes through the multiple layers of water-filtering and oil-blocking elastic screens (5.6) and the oil-blocking and water-filtering filter material (5.7), enters the annulus between the central pipe (5.1) and the central screen pipe (5.2), flows out through the guide holes (5.10), and is then injected into the water injection layer (8) through the jet injection pump (4).

10. The method for using the same-well jet injection device according to claim 9, characterized in that: The process includes: (i) A jet injection and production device is lowered into the well, and a high-pressure water injection pump is started on the surface. The well is first flushed forward to clean out the stored liquid in the wellbore, and then the jet injection and production process is introduced into the well. The high-pressure power fluid descends through the small-diameter oil pipe (1) into the jet pump (3) and draws and sucks the low-water-content crude oil in the annular space between the oil pipe (2) and the casing (9), and then rises to the surface along the annular space between the oil pipe (2) and the small-diameter oil pipe (1); the remaining high-pressure power fluid passes through the salvageable pump core (3.5) in the jet pump (3) and the oil pipe (2) connected below, and continues to descend into the jet injection pump (4), draws and sucks the formation water that has been deoiled and filtered by the oil-blocking water filter (5), and the formed mixed water is injected into the water injection layer (8) through the mixed liquid outlet pipe and the oil pipe (2) below, thereby realizing the oil production and water injection functions in the well; (ii) When the jet oil pump (3) needs to be inspected and replaced, a fishing device connected with a steel wire is lowered into the small-diameter oil pipe (1) to pull out the salvageable pump core (3.5). After inspection, the repaired salvageable pump core (3.5) is lowered into the well from the small-diameter oil pipe (1) to resume injection and production without the need for well repair equipment; When it is necessary to replace and overhaul the retrievable nozzle (4.3) in the lower jet water injection pump (4), firstly remove the retrievable pump core (3.5) in the jet oil pump (3), then lower a salvage device connected by a steel wire to retrieve the retrievable nozzle (4.3) of the jet water injection pump (4) from the well for overhaul and replacement, and after the overhaul, re-enter the well from the small-diameter oil pipe (1). The outer diameter of the retrievable pump core (3.5) of the upper jet oil pump (3) is larger than the outer diameter of the retrievable nozzle (4.3) of the lower jet water injection pump (4) to ensure smooth lifting and lowering of the retrievable nozzle (4.3); (III) Well washing operation: After a period of injection and production in the same well, when the annular space of the oil pipe (2) and casing (9) at the bottom of the wellbore and the outer wall of the oil-blocking water filter (5) need to be cleaned of oil and the cleanliness of the injected water is increased, the injection of high-pressure power fluid is first stopped and the annular wellhead gates of the small-diameter oil pipe (1) and the ground wellhead are closed, and the casing gate is opened. The high-pressure return water of the injection layer (8) is then used to wash the oil-blocking water filter (5) and the inner wall of the annular space of the oil pipe (2) and casing (9) to perform a backwash operation to wash the blockage and oil out of the ground.

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