Downhole separate recovery intelligent control double-flow valve

Abstract

The application relates to the technical field of oilfield downhole separate layer production, in particular to a downhole separate production intelligent control double-flow valve, which comprises an upper joint, an upper annular cavity, an intelligent control main body, a lower annular cavity, a screen pipe, a lower joint, a thin steel pipe, a liquid inlet valve body and an upper power cable; an inner through pipe penetrating through the annular sealing cavity of the intelligent control main body connects the upper annular cavity and the lower annular cavity; the inner upper end head at the two ends of the intelligent control main body and the valve main body are provided with penetrating pipe holes and cable holes, the valve main body is provided with a liquid inlet flow channel for single medium flow, the liquid inlet flow channel is provided with a switch valve and a single-flow valve; the screen pipe is connected with the valve main body to form a fluid filtering mechanism; the liquid inlet valve body arranged in the central hole of the intelligent control main body and the liquid inlet flow channel of the valve main body form double liquid inlet channels; the upper joint and the liquid inlet valve body with different structures can be replaced to form another novel intelligent control switch, and the novel intelligent control switch is combined with the same well to form a downhole intelligent control separate production structure with two layers or three layers or more than three layers; when the application is used for separate layer production, the problem of interlayer interference can be avoided.

Description

Technical Field

[0001] This application relates to the field of downhole stratified production technology in oilfields, specifically to a downhole intelligent control dual-flow valve for stratified production. Background Technology

[0002] In the early stages of oilfield development, the main reservoirs are extracted independently from bottom to top. Once these main reservoirs reach the medium to high water-cut stages, integrated well production is implemented, typically using large pumps to increase single-well crude oil production. However, due to inter-layer heterogeneity, this method is not very effective. Furthermore, prolonged water injection exacerbates pressure imbalances between reservoirs, increasing vertical inter-layer conflicts. In integrated well production, high-pressure reservoirs suppress the production capacity of low-pressure reservoirs, impacting crude oil output. Subdivided layer production technology can address inter-layer interference in high-water-cut, heterogeneous reservoir development, fully leveraging the potential of each oil-bearing layer and further tapping untapped reserves in the original main reservoirs. However, this technology has not been widely adopted in oilfields due to technical bottlenecks such as layered metering, layered pressure measurement, and short lifespan of the separate production system.

[0003] Domestic oilfields employ a combination of tubular pumps, rod pumps, and intelligent control switches (or intelligent production control devices) to achieve multi-layer production through downhole switching, thus obtaining information on the oil production of each layer and overcoming the technical bottlenecks of layered metering and pressure measurement. However, the increased oil production effect when two or more layers are produced simultaneously does not reach the sum of the oil production when each layer is produced independently, failing to achieve the expected results of separate production. The production capacity of each layer is not fully released because the inter-layer interference problem has not been effectively resolved. Existing intelligent switches (or intelligent production control devices) have structural issues: Patent application CN202210187881.7 discloses an intelligent downhole water distribution and production device based on a hollow torque motor. It includes a motor housing, a valve seat, and a valve port, a hollow lead screw, and a valve core on the valve seat. Essentially, the hollow lead screw, driven by the rotor of the hollow torque motor, achieves linear motion, which in turn drives the valve core to move linearly to open and close the valve port. The valve port is a double-opening elongated hole. Problem: When multiple units are activated simultaneously, the different partition layers are interconnected, leading to high-pressure layer backflow into the low-pressure layer.

[0004] Patent application number CN202223043650.3 discloses a single-stage dual-control type oil well layered production intelligent production distribution device with wavecode communication. It includes a lower connector, a lower split nut, a valve seat, a motor mounting base, a motor cavity shell, a central liquid passage pipe, an upper split nut, an upper connector, a pressure wave detection system, and a linear switching valve mechanism. Liquid inlet channels are provided on both the upper and lower sides of the lower connector. There are two linear switching valve mechanisms, and their positions correspond to the valve seats. Problems exist: because the two valves share the central liquid passage pipe for liquid discharge, the two formations are in a connected state when they are opened at the same time, causing the high-pressure layer to backflow into the low-pressure layer; the valves open linearly, the switching time is long, the power consumption is high, and the service life is short under the same power conditions.

[0005] In summary, all the intelligent switches (production controllers) currently used in the oilfield suffer from interlayer interference problems. Summary of the Invention

[0006] This application provides a downhole intelligent control dual-flow valve for solving the problem of inter-layer interference caused by different oil pressures in different layers.

[0007] This application is achieved through the following technical solution: A downhole intelligent control dual-flow valve includes: an upper connector, wherein the upper connector is internally threaded to seal and connect to a pump cylinder and internally threaded to connect to an oil pipe; the upper connector end face is provided with at least two small holes for passing through steel pipes along the circumferential direction.

[0008] The rotating sleeve is threadedly sealed to the valve outer sleeve and the sealing sleeve is provided on the upper connector. The upper connector is also threadedly connected to a limit ring to restrict the axial movement of the rotating sleeve on the upper connector. The rotating sleeve is used to push the upper connector to move in a straight line, and the steel pipe slides along the axial small hole of the upper connector. The rotating sleeve and the upper connector are connected as one unit by connecting strips and screws.

[0009] The intelligent control body includes a valve outer sleeve and a central tube located inside the valve outer sleeve. The upper connector is connected to one end of the valve outer sleeve. An inner upper end and a valve body are spaced apart between the central tube and the valve outer sleeve to form an annular sealing cavity. The inner upper end is located inside the annular sealing cavity near the upper connector. The valve body and the inner upper end are respectively provided with coaxially arranged cable holes. An inner through pipe is provided inside the annular sealing cavity. The inner through pipe connects the upper annular cavity and the lower annular cavity at both ends of the inner upper end and the valve body through a through hole and an oblique channel, respectively. The valve body has a liquid inlet channel that connects the outside of the valve outer sleeve and the inside of the central tube. A switch valve and a check valve are provided in the liquid inlet channel. A screen tube, which is connected to the valve body to filter the fluid entering the inlet channel; The lower connector is sleeved with the screen tube with a gap, and the lower connector is axially spaced from the valve body and connected through the lower outer tube; A thin steel pipe extends from the outer groove of the lower connector and passes through the small hole at the lower end of the pipe hole of the valve body, and is sealed and connected by a conical rubber plug and a rubber plug cap. The inlet valve body is sealed to the inner hole of the valve body and sealed to the lower outer tube; the inlet valve body is provided with a cap-shaped valve cover, a valve ball and a valve seat.

[0010] The upper cable passes through the upper connector and the inner upper end in sequence to connect with the control circuit board, and extends out through the cable hole of the valve body.

[0011] In some optional embodiments, the valve body has a first receiving hole and a second receiving hole, the first receiving hole communicating with the outside of the valve body, the second receiving hole communicating with the inside of the central tube, and the first receiving hole and the second receiving hole communicating with each other. The one-way valve is disposed in the second receiving hole, the switching valve is disposed in the first receiving hole, the switching valve is configured to control fluid to enter the second receiving hole from the first receiving hole, and the one-way valve is configured to restrict fluid in the central tube from entering the first receiving hole through the second receiving hole.

[0012] In some optional embodiments, one end of the first receiving hole is connected to one end of the second receiving hole through a fan-shaped flow channel. When the screen tube is connected to the valve body, one end of the screen tube forms a closure on the annular groove at the outer end of the fan-shaped flow channel.

[0013] In some optional embodiments, there is a gap between the screen tube and the lower outer tube, and the liquid inlet of the screen tube is a round hole and / or an axial narrow slit.

[0014] In some alternative embodiments, the outer wall of the screen tube is wound with steel wire.

[0015] In some alternative embodiments, the inner upper end is equipped with an internal pressure gauge and a thermometer.

[0016] In some optional embodiments, the end of the upper connector is provided with an annular groove, which together with the inner upper end forms an upper annular cavity, wherein the measuring channels of the pressure gauge and thermometer inside the tube are connected to the upper annular cavity.

[0017] In some optional embodiments, the valve body is equipped with a low-speed motor, a formation pressure gauge, and a pump chamber pressure gauge, wherein the low-speed motor is connected to the switching valve to drive the switching valve to operate.

[0018] In some alternative embodiments, the switching valve is configured to control the flow channel size and / or shut off the flow channel via a mechanical actuation.

[0019] In some alternative embodiments, the switching valve is configured as a cylindrical valve, a ball valve, a cone valve, or a gate valve.

[0020] In some alternative embodiments, the one-way valve is configured as a one-way flow valve that opens by liquid actuation and closes by its own weight and liquid backflow.

[0021] In some alternative embodiments, the one-way valve is configured as a ball valve or annular valve with a low inlet and a high outlet.

[0022] In some alternative embodiments, the number of the inner tubes is at least one.

[0023] In some alternative embodiments, the thin steel tube and rubber stopper cap are replaced with a channel plug, wherein the channel plug is used to seal the through-holes on the upper connector and valve body.

[0024] In some alternative embodiments, the upper connector is replaced with a single upper connector, and the liquid inlet valve body is replaced with a liquid-sealed short pipe; the channel plug of the single upper connector is removed, or a thin steel pipe is inserted inside and sealed with a conical rubber plug and a rubber plug cap.

[0025] Compared with the prior art, this application has the following advantages and beneficial effects: 1. This application integrates the lateral fluid inlet function of the existing intelligent control switch (production distribution device) with the center fluid inlet function of the fixed valve of the oil pump into one unit, which is placed at the lower end of the lower pump as the intelligent control dual-flow valve (single-flow valve, fixed valve) for the separate production, realizing that one switch controls the fluid inlet of two formations respectively; in addition, after simple adjustment of the functional parts, it is placed between the two pumps to form the intelligent control single-flow valve of the upper production pump. The combination of the upper and lower pumps and the two intelligent control single-flow valves forms the main structure of the three-layer intelligent control production pump; after adjusting the functional parts, it is placed on the tubing at the lower end of the lower pump to form the three-layer intelligent control production process tubing.

[0026] 2. This application sets a rotary switch with low driving resistance and simple structure at the front end of the switch fluid inlet channel, and a fixed valve, namely a ball valve, with a special structure for oil production pumps at the rear end to withstand the high pressure differential environment and frequent operation of the pump. Its service life is consistent with that of conventional pumps. Since the front switch only operates when layered metering and adjusting the production layer, its working frequency is extremely low. Solving the problems of corrosion prevention and scale prevention on the switch surface can enable it to work for a long time downhole.

[0027] 3. This application adds a screen tube to the front end of the inlet of the switch to prevent mechanical residue from entering, ensure the cleanliness of the flowing medium, and further improve the working environment of the two moving parts and the pump; its filtration area is much larger than the valve port cross-section, which reduces the medium flow rate and extends the service life; the size of the filter particles of the screen tube can be set into the structure of fine slits, round holes and wire winding according to the needs of the oil layer, which can effectively prevent mechanical impurities from entering the pump.

[0028] 4. This application, together with the pump barrel and the outer pipe, forms a dual-pipe intelligent control and production pump structure, which enhances the pump body strength, overcomes the phenomenon of easy bending of small-diameter pump bearings under axial load, and enhances the ability to adapt to different well conditions.

[0029] 5. When the single-flow valve in this application is used in the pump-down distribution pipe string, it prevents the high-pressure layer from backflowing into the low-pressure layer.

[0030] 6. The work instructions of this application are issued in real time at the wellhead or control room. Combined with the daily sampling and analysis data of the oil well, the oil production data and stratified measurement results of each production layer can be obtained, reducing the frequency of surface operations and saving operating costs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the exemplary embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the cross-sectional structure of the intelligent control dual-flow valve for downhole mining provided in an embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point DD; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point D1-D1; Figure 4 for Figure 2 Schematic diagram of a partial cross-sectional structure at point BB; Figure 5 for Figure 2 Schematic diagram of the partial cross-sectional structure at the CC section; Figure 6 This is a schematic diagram of the cross-sectional structure of the liquid-sealed short pipe provided in an embodiment of this application; Figure 7 This is a partial structural diagram of the embodiment of this application after replacing the upper connector with a single upper connector.

[0032] The attached diagram shows the markings and corresponding component names: 1-Pump barrel, 2-Combination plunger, 3-Upper inlet cable, 4-Upper connector, 5-Screw, 6-Connecting strip, 7-Rotating sleeve, 8-Sealing ring, 9-Limiting ring, 10-Valve outer sleeve, 11-Cable connector, 12-Conical rubber plug, 13-Inner upper end, 14-Inner pressure gauge, 15-Thermometer, 16-Inner through pipe, 17-Control circuit board, 18-Center tube, 19-Valve body, 191-Inlet flow channel, 192-Pump chamber side port, 193-Fan-shaped channel, 194-Valve external pressure port, 195-Pump chamber pressure port, 196-Through hole, 197-Angled channel, 198-Cable 20-One-way valve, 21-Screw tube, 211-Slit or small round hole, 22-Inlet valve body, 221-Cap-shaped valve cover, 222-Valve ball, 223-Valve seat, 23-Lower connector, 24-Slim steel pipe, 25-Low speed motor, 26-Limit block, 27-Limit body, 28-Spring, 29-Drive shaft, 30-Switch valve, 301-Radial hole, 31-Formwork pressure gauge, 32-Pump chamber pressure gauge, 33-Cable seal connector, 34-Rubber plug cap, 35-Lower outer tube, 36-Channel plug, 37-Liquid seal short tube, 38-Single upper connector, 39-Upper annular cavity, 40-Lower annular cavity. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0034] Please refer to them together. Figures 1-7This application provides a downhole intelligent control dual-flow valve, which includes an upper connector 4, an intelligent control body, a lower connector 23, a screen pipe 21, a thin steel pipe 24, an inlet valve body 22, and an upper inlet cable 3. A pump cylinder 1 is connected inside the upper connector 4. The intelligent control body includes a valve outer sleeve 10 and a central pipe 18 located inside the valve outer sleeve 10. The upper connector 4 is connected to one end of the valve outer sleeve 10. An inner upper end 13 and a valve body 19 are spaced apart between the central pipe 18 and the valve outer sleeve 10 to form an annular sealing cavity. The inner upper end 13 is located within the annular sealing cavity near the upper connector 4. At the valve body 19 and the inner upper port, there are coaxially arranged through-holes 196 and coaxially arranged cable holes 198, respectively. An inner through-hole 16 is provided in the annular sealing cavity. The two ends of the inner through-hole 16 are connected to the inner upper end 13 and the through-holes 196 of the valve body 19, respectively. The valve body 19 has a liquid inlet channel 191 that connects the outside of the valve outer sleeve 10 and the inner hole of the central tube 18. A switch valve 30 and a check valve 20 are provided in the liquid inlet channel 191. A screen tube 21 is connected to the valve body 19 to filter the fluid entering the liquid inlet channel 191. A lower connector 23 is connected to the screen tube 21. A thin steel pipe 24 is axially spaced from the valve body 19 and connected via a lower outer pipe 35; the thin steel pipe 24 passes through the lower connector 23 and is installed in the through-hole 196 of the valve body 19. A conical rubber plug 12 and a sealing cap are arranged between the thin steel pipe 24 and the through-hole 196 to ensure the sealing of the connection between the two. The thin steel pipe 24 is connected to the hydraulic tool at the lower end, thus forming a hydraulic passage for pumping. This passage is parallel to the oil pipe and can at least add a smart switch to form a 3-layer sampling pipe column; the inlet valve body 22 is sealed to the inner hole of the valve body 19 and to the lower outer pipe 35. The inner hole of the valve body 19... An annular groove is also provided, and the inlet valve body 22 and the annular groove form a lower annular cavity 40. The lower annular cavity 40 is connected to the through hole 196 on the valve body 19 through an inclined channel 197. The upper inlet cable 3 passes through the inner upper end 13 and the cable hole 198 of the valve body 19 in sequence. A cable connector 11 is provided in the upper annular cavity 39 to connect the cable at the upper end of the upper connector 4 and the upper inlet cable 3. A cable seal connector 33 and a rubber plug cap 34 are arranged between the upper inlet cable 3 in the annular sealing cavity and the valve body 19 to ensure the sealing of the upper inlet cable 3 in the through hole 196 of the valve body 19.

[0035] In this embodiment, the upper connector 4 is typically designed as an annular tube. The inner hole of the upper connector 4 is threaded to facilitate connection with other components. A connecting strip 6 is fitted onto the outer wall of the upper connector 4, and the connecting strip 6 is fixed by screws 5. The pump cylinder 1 passes through the inner hole of the upper connector 4 and is sealed to the inner hole of the upper connector 4 by a sealing ring 8. The upper connector 4 is connected to the valve outer sleeve 10 via a shaft-hole fit. For example, a rotating sleeve 7 is fitted onto one end of the upper connector 4. The rotating sleeve 7 is circumferentially positioned by the connecting strip 6. The rotating sleeve 7 passes through the valve outer sleeve 10 and is threaded to it. The rotating sleeve 7 is sealed to the inner hole of the valve outer sleeve 10 by a sealing ring 8. A limiting sleeve is also provided between the rotating sleeve 7 and the inner upper end 13 to achieve axial positioning of the inner upper end 13.

[0036] In this embodiment, the inner upper end 13 is generally shaped as an annular cylinder. The inner upper end 13 is fitted onto the central tube 18 and also passes through the valve outer sleeve 10, engaging with the shaft hole of the valve outer sleeve 10. Sealing rings 8 are provided between the inner upper end 13, the valve outer sleeve 10, and the central tube 18 to ensure sealing. The axes of the through hole 196 and the cable hole 198 of the inner upper end 13 are parallel to the axis of the inner upper end 13.

[0037] In this embodiment, the valve body 19 is generally cylindrical. The valve body 19 mates with the end shaft hole of the valve sleeve 10. Specifically, the valve body 19 passes through one end of the valve sleeve 10. The inner cylinder of the valve body 19 mates with the central tube 18. A sealing ring 8 is disposed between the central tube 18 and the valve body 19 to ensure sealing. Thus, the central tube 18, the valve sleeve 10, the valve body 19, and the inner upper end 13 together form an annular sealing cavity. A pump chamber side port 192 is radially opened from the inner hole of the valve body 19. The pump chamber side port 192 communicates with the liquid outlet of the check valve 20 and also communicates with the central tube 18, thereby allowing fluid outside the valve to enter the central tube 18.

[0038] In some optional embodiments, the valve body 19 has a first receiving hole and a second receiving hole, which are axially formed from the ends of the valve body 19 away from the lower connector 23. The first receiving hole communicates with the outside of the valve body 19, and the second receiving hole communicates with the inside of the central tube 18. In actual implementation, a pump chamber side port 192 can be radially opened from the inner hole of the valve body 19, and the first and second receiving holes can communicate with each other. Specifically, an annular groove can be opened on the outer wall of the valve body 19 to form a fan-shaped channel 193, and the end of the first and second receiving holes near the lower connector 23 is the screen tube. At the connection point 21, a fan-shaped channel 193 is connected. When the screen tube 21 is threadedly connected to the valve body 19, the end of the screen tube 21 forms a closure on the outer groove of the fan-shaped channel 193. The one-way valve 20 is located in the second receiving hole and is connected to the central tube 18 through the pump chamber side port 192. The switch valve 30 is located in the first receiving hole and is connected to the outside of the valve through the liquid inlet channel 191. The switch valve 30 is configured to control the fluid to enter the second receiving hole from the first receiving hole, and the one-way valve 20 is configured to restrict the fluid in the central tube 18 from entering the first receiving hole through the second receiving hole.

[0039] In some optional embodiments, there is a gap between the screen pipe 21 and the lower outer pipe 35. A groove for a thin steel pipe 24 (usually a steel cable) is provided between the screen pipe 21 and the lower connector 23. The inlet hole of the screen pipe 21 is a round hole and / or an axial thin slit. Steel wire can be wound on the outer wall of the screen pipe 21. Preferably, the inlet hole on the screen pipe 21 is a plurality of axial thin slits of different lengths. The width of the thin slits and the axial length of the screen pipe 21 can be determined according to the pump displacement and the properties of the oil layer fluid. In this way, mechanical impurities in the oil can be filtered during normal oil well production, effectively preventing impurities in the oil from damaging the switching valve 30 and the check valve 20, improving the working environment, avoiding jamming of the switching valve 30, and extending the service life of the check valve 20.

[0040] In some optional embodiments, a control circuit board 17 and a low-speed motor 25 are disposed within the annular sealing cavity. The low-speed motor 25 is connected to the switching valve 30 to respond to the commands of the control circuit board 17, thereby driving the switching valve 30 to change the circumferential angle of the radial hole 301 on the switching valve 30, thus controlling the opening and closing of the liquid inlet channel 191. Specifically, the low-speed motor 25 can be driven by the valve core of the switching valve 30 via a drive shaft 29. During assembly, the valve core of the switching valve 30 is first placed into the first receiving hole, and then the spring 28, the annular limiting body 27, and the annular limiting block 26 are placed in sequence. Then, the drive shaft 29 is passed through the limiting block 26, the limiting body 27, and the spring 28 in sequence. The drive shaft 29 is connected to the valve core of the switching valve 30 via a coupling. When the drive shaft 29 is assembled, the coupling is embedded in the first receiving hole and abuts against the limiting block 26 to achieve axial positioning of the limiting block 26. The spring 28 is used to provide axial force to the valve core of the switching valve 30, which can avoid the influence of the assembly of the drive shaft 29, the valve core of the switching valve 30, the limiting body 27, the low-speed motor 25, and the machining depth and dimensional accuracy of the first receiving hole. Necessary sealing rings 8 are provided between the coupling and the hole wall of the first receiving hole, between the coupling and the outer wall of the drive shaft 29, and between the coupling and the output shaft of the low-speed motor 25 to ensure sealing performance.

[0041] In some optional embodiments, the inner upper end 13 is provided with an internal pressure gauge 14 and a thermometer 15. The internal pressure gauge 14 and the thermometer 15 are respectively installed inside the inner upper end 13, wherein the inner upper end 13 is provided with a measuring flow channel adapted to the internal pressure gauge 14 and the thermometer 15.

[0042] In some optional embodiments, the end of the upper connector 4 is provided with an annular groove, which together with the valve outer sleeve 10 and the inner upper end 13 forms an upper annular cavity 39, wherein the measuring channels of the pressure gauge 14 and the thermometer 15 inside the pipe are connected to the upper annular cavity 39.

[0043] In some optional embodiments, the valve body 19 is equipped with a formation pressure gauge 31 and a pump chamber pressure gauge 32, wherein a low-speed motor 25 is connected to the switching valve 30 to drive the switching valve 30 to operate. The formation pressure gauge 31 and the pump chamber pressure gauge 32 are sealed and connected to the valve body 19 from the end near the low-speed motor 25. The valve body 19 has an external pressure port 194 and a pump chamber pressure port 195. The external pressure port 194 communicates with the outside, and the pump chamber pressure port 195 communicates with the inner hole of the valve body 19.

[0044] In some alternative embodiments, the switching valve 30 is configured as a cylindrical valve, a ball valve, a cone valve, or a gate valve.

[0045] In some alternative embodiments, the check valve 20 is configured as a one-way flow valve that opens by liquid actuation and closes by its own weight and liquid backflow. In practice, the check valve 20 may be configured as a ball valve or annular valve with a low inlet and high outlet.

[0046] In some optional embodiments, the number of inner tubes 16 is at least one, and the upper inner end 13 and the valve body 19 are provided with a corresponding number of through holes 196. When there are multiple inner tubes 16, the multiple inner tubes 16 can be evenly distributed around the circumference.

[0047] In some alternative embodiments, the inlet valve body 22 is replaced with a liquid seal short pipe 37 (lower pump barrel), and the thin steel pipe 24 and rubber plug cap 34 at the lower end of the valve body 19 are replaced with a channel plug 36, thus forming a separate pump intelligent control inlet valve that can be installed between the upper and lower pumps.

[0048] In some optional embodiments, the valve seat in the inlet valve body 22 is replaced with a solid valve seat, and the thin steel pipe 24, the upper inlet cable 3, and the rubber plug cap 34 at the lower end of the valve body 19 are replaced with a channel plug 36. This constitutes the intelligent control inlet valve of the sub-production pump. The communication cable extending from the upper end is connected to the communication cable extending from the intelligent control inlet valve of the upper pump, thus forming a two-layer pump body structure with cable intelligent control of the sub-production.

[0049] In some optional embodiments, the upper connector 4 is replaced with a single upper connector 38, and the inlet valve body 22 is replaced with a liquid-sealed short pipe 37; thus, an intelligent inlet valve for the pump lower tubing is formed; this valve can be used with ordinary tubular pumps and rod pumps with a hydraulic passage for pumping. When multiple units are connected in series: when the thin steel pipe 24 and the upper cable 3 are inserted into the through holes 196 at both ends of the valve, they are sealed with conical rubber plugs 12 and rubber plug caps 34; when the through holes 196 at both ends of the valve are empty, they are sealed with conical rubber plugs 12 and channel plugs 36.

[0050] In some optional embodiments, the intelligent inlet valve of the downhole production pump, the intelligent dual-flow valve of the downhole production pump, and the intelligent inlet valve of the downhole tubing of the present invention are used in combination to form a three-layer cabled intelligent production structure in the well.

[0051] When using the 3-layer intelligent control and data collection structure: (1) Tool preparation before going downhole: Set the working parameters and switch status of the three intelligent control valves. Set the three intelligent control valves to fully open. Assemble the upper and lower pumps and the intelligent control liquid inlet valve of the sub-production pump into one unit. Connect the upper thread of the sub-production intelligent control dual flow valve to a packer. Connect the lower end of the sub-production intelligent control dual flow valve to the tubing, packer, tubing and pump downhole tubing string intelligent control liquid inlet valve in sequence. (2) Each tool is lowered and inspected in sequence according to the tubing design: the thin steel pipe 24 and the upper inlet cable extend from the upper annular cavity 39 of the intelligent control inlet valve of the pump lower tubing and are connected to the other two intelligent control valves. Mechanical oil is injected into the thin steel pipe 24 and pressure tested. After passing the test, it is sealed and connected to the hydraulic passage of the pump. Communication is performed every 10 to 15 oil pipes. After passing the test, the lowering continues. (3) Production pump and tubing run into the well: The outer tubing of the upper pump is connected to the anchor unloader and lowered into the designed position using tubing; (4) Separating the formation: Pressurize the tubing with 12~15MPa and anchor the unloader, packer, and through-pipe packer in sequence, and then set the tubing hanger; (5) Lowering the production pump plunger and opening the well: Connect the combined plunger 2 with the sucker rod and lower it into the well. Bump the pump, raise the anti-impact distance, install the wellhead and pumping equipment, and start pumping production. (6) Layered metering: The switches of the three intelligent control valves are set to fully open when they are run into the well. At this time, the production is mixed from the three layers. The production lasts for 3 to 5 days. The residual fluid in the well is drained and the production status before the well operation is restored. Work instructions are issued at the wellhead or in the control room. The method of shutting down two layers and producing one layer is adopted. The three layers are left to produce independently for 3 to 5 days. The oil production data of the three layers can be obtained at the wellhead, thus completing the layered metering work. (7) Layered oil production: Based on the production data of the two oil layers corresponding to the lower pump, the layer with higher oil production is prioritized to produce simultaneously with the upper pump. The two layers produce oil independently and do not interfere with each other.

[0052] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0053] It should be noted that in this specification, similar reference numerals and letters in the above figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this application, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A downhole intelligent control dual-flow valve, characterized in that, include: Upper connector (4), the lower inner thread of the upper connector (4) is used to seal and connect the pump cylinder (1) and the upper inner thread is used to connect the oil pipe; the end face of the upper connector (4) is provided with at least two small holes for passing through steel pipes along the circumferential direction; Rotary sleeve (7), the rotary sleeve (7) is threadedly sealed to the valve outer sleeve (10) and the sealing sleeve is provided on the upper connector (4). The upper connector (4) is also threadedly connected to a limit ring (9) to restrict the axial movement of the rotary sleeve (7) on the upper connector (4). The rotary sleeve (7) is used to push the upper connector (4) to move linearly. The steel pipe slides along the axial small hole of the upper connector (4). The rotary sleeve (7) and the upper connector (4) are connected as one unit by a connecting strip (6) and screws (5). The intelligent control body includes a valve sleeve (10) and a central tube (18) located inside the valve sleeve (10). The upper connector (4) is connected to one end of the valve sleeve (10). An inner upper end (13) and a valve body (19) are spaced apart between the central tube (18) and the valve sleeve (10) to form an annular sealing cavity. The inner upper end (13) is located in the annular sealing cavity near the upper connector (4). The valve body (19) and the inner upper end are respectively provided with coaxially arranged through holes (196). The annular sealing cavity is provided with an inner tube (16), which connects the upper annular cavity (39) and the lower annular cavity (40) at both ends of the inner upper end (13) and the valve body (19) through the through hole (196) and the oblique channel (197), respectively. The valve body (19) has a liquid inlet channel (191) that connects the outside of the valve sleeve (10) and the inner hole of the central tube (18). The liquid inlet channel (191) is provided with a switch valve (30) and a check valve (20). A screen tube (21) is connected to the valve body (19) to filter the fluid entering the inlet channel (191); The lower connector (23) is sleeved with the screen tube (21) with a gap, and the lower connector (23) is axially spaced from the valve body (19) and connected through the lower outer tube (35). A thin steel pipe (24) extends from the outer groove of the lower connector (23) and passes through the small hole at the lower end of the through hole (196) of the valve body (19), and is sealed and connected by a conical rubber plug (12) and a rubber plug cap (34); The inlet valve body (22) is sealed to the inner hole of the valve body (19) and sealed to the lower outer tube (35); the inlet valve body (22) is provided with a cap-shaped valve cover (221), a valve ball (222) and a valve seat (223). The upper cable (3) passes through the upper connector (4) and the inner upper end (13) in sequence and connects to the control circuit board (17), and extends out through the cable hole (198) of the valve body (19).

2. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The valve body (19) has a first receiving hole and a second receiving hole. The first receiving hole is connected to the outside of the valve body (19), and the second receiving hole is connected to the inside of the central tube (18). The first receiving hole and the second receiving hole are connected. The one-way valve (20) is disposed in the second receiving hole, and the switching valve (30) is disposed in the first receiving hole. The switching valve (30) is configured to control fluid to enter the second receiving hole from the first receiving hole, and the one-way valve (20) is configured to restrict fluid in the central tube (18) from entering the first receiving hole through the second receiving hole.

3. The downhole intelligent control dual-flow valve according to claim 2, characterized in that, One end of the first receiving hole is connected to one end of the second receiving hole through a fan-shaped channel (193). When the screen tube (21) is connected to the valve body (19), one end of the screen tube (21) forms a closed annular groove at the outer end of the fan-shaped channel (193).

4. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, There is a gap between the screen tube (21) and the lower outer tube (35), and the liquid inlet hole of the screen tube (21) is a round hole and / or an axial fine strip slit.

5. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The outer wall of the screen tube (21) is wrapped with steel wire.

6. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The inner upper end (13) is equipped with an internal pressure gauge (14) and a thermometer (15).

7. The downhole intelligent control dual-flow valve according to claim 6, characterized in that, The end of the upper connector (4) is provided with an annular groove, which together with the inner upper end (13) forms an upper annular cavity (39), wherein the measuring channels of the pressure gauge (14) and the thermometer (15) inside the tube are connected to the upper annular cavity (39).

8. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The valve body (19) is equipped with a low-speed motor (25), a formation pressure gauge (31) and a pump chamber pressure gauge (32), wherein the low-speed motor (25) is connected to the switching valve (30) to drive the switching valve (30) to operate.

9. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The switching valve (30) is configured to control the flow channel size and / or cut off the flow channel by means of mechanical drive.

10. The downhole intelligent control dual-flow valve according to claim 9, characterized in that, The switching valve (30) is configured as a cylindrical valve, ball valve, cone valve, or gate valve.

11. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The one-way valve (20) is configured as a one-way flow valve that is opened by liquid drive and closed by its own weight and liquid backflow.

12. The downhole intelligent control dual-flow valve according to claim 11, characterized in that, The single-flow valve (20) is configured as a ball valve or annular valve with low inlet and high outlet.

13. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The number of the inner tubes (16) is at least one.

14. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The thin steel tube (24) and the rubber plug cap (34) are replaced with a channel plug (36), wherein the channel plug (36) is used to seal the through hole (198) on the upper connector (4) and the valve body (19).

15. The downhole intelligent control dual-flow valve according to claim 1, characterized in that, The upper connector (4) is replaced with a single upper connector (38), and the liquid inlet valve body (22) is replaced with a liquid seal short pipe (37); the channel plug (36) on the single upper connector (38) is removed, or a thin steel pipe (24) is inserted into it and sealed with a conical rubber plug (12) and a rubber plug cap (34).

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