A downhole intelligent cable-assisted separate recovery system and method

Abstract

The application discloses a downhole cable intelligent separate production system and method. The system comprises a plurality of oil pipes and a plurality of through-tubing packers. The oil pipes are arranged on the inner side of a casing. Adjacent two oil pipes are connected through intelligent control switches. The opening size of the intelligent control switch is adjustable to adjust the flow rate of the oil outside the corresponding oil pipe into the oil pipe. The through-tubing packer is used to separate the space between the oil pipe outside and the casing inside into a plurality of independent cavities. Each intelligent control switch is located between corresponding two through-tubing packers. The method is based on the above-mentioned downhole cable intelligent separate production system. The beneficial effect of the application is that the flow rate of the oil outside the corresponding oil pipe into the oil pipe is controlled through each intelligent control switch, thereby realizing the optimization of the liquid distribution ratio of each oil production layer, making the pressure of each oil layer in a suitable range, reducing the interlayer interference during commingled production, and improving the crude oil production.

Description

Technical Field

[0001] This invention relates to the field of oil extraction, and specifically to a downhole wired intelligent extraction system and method. 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 process is not very effective. Furthermore, prolonged water injection exacerbates pressure imbalances between reservoirs, increasing vertical inter-layer interference. 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 reservoirs, 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] With the breakthrough in cabled intelligent stratified oil production technology, domestic oilfields have adopted intelligent switching tools to solve the technical bottlenecks of well stratified metering and pressure measurement. The process tubing uses a combination of tubular pumps, rod pumps and intelligent control switches to obtain the oil production of each layer by switching between multiple oil layers downhole. However, problems such as inter-layer interference when two layers are produced independently at the same time or multiple layers are produced at the same time have not been effectively solved.

[0004] The invention patent "Intelligent Separate Production Tubing String," application number CN201811121627.7, employs an integrated cable-operated separate production tubing string. The separate production switch is located below the pumping unit. The tubing string features at least two separate control switches and at least two packers. Each pair of separate control switches is connected to a packer, and the topmost separate control switch is connected to a packer. All separate control switches are electrically connected to control cables in parallel to form an integrated structure. This invention enables all processes to be completed in a single tubing run, with single-layer water nozzles opening and closing in real time. However, the design drawings and process drawings do not address the structure, measures, and process solutions for inter-layer interference. Problems exist: the two layers cannot be extracted independently and simultaneously; when both switches are opened at the same time, high-pressure layer fluid may enter the low-pressure layer.

[0005] The patent "A Cable-Connected Pipeline Pump Separate Production Testing System" (application number CN202121611539.2) comprises: a bottom plug connected by tubing from bottom to top, an intelligent separate production unit, a line packer, a differential pressure sleeve, an oil draining mechanism, a tubular pump, sucker rod, wiring, and a wellhead sealing mechanism. This system enables intelligent layered production with a single tubing string run, is simple to construct, and has a stable structure, solving the technical challenges of layered metering and real-time uploading of layered pressure tests. However, it has drawbacks: the design drawings and specifications do not address the principle of the switch structure; there are no solutions or preventative measures for inter-layer interference when three intelligent separate production units simultaneously inject fluid; and high-pressure fluid may enter low-pressure oil layers. Furthermore, the three intelligent separate production units are all mounted on the tubing string below the tubular pump, only achieving alternating production of three layers, not simultaneous independent production of at least two layers, and the technical challenge of inter-layer interference remains to be solved.

[0006] "A Tubing String and Construction Method for a Tubing Pump Well," application number CN202311453514.8, is characterized by comprising: a surface control system, a tubing pump, a differential pressure sliding sleeve, a safety joint, multiple packers, and a production distributor connected in a top-to-bottom sequence via tubing to form a tubing string; through the cooperation of the differential pressure sliding sleeve and the tubing pump, bidirectional flow is achieved in the tubing string before triggering, and the one-way valve function of the tubing pump is restored after triggering, thus enabling the tubing pump well to complete construction with a single well run. This invention effectively solves the problems of tubing pump wells only being able to produce fluid in one direction, unable to achieve surface injection fluid passage, packer pressure setting, and selective layer production; however, it does not address the technical bottlenecks of simultaneous independent production of at least two layers and inter-layer interference during simultaneous production of multiple layers. Summary of the Invention

[0007] The technical problem to be solved by this invention is that inter-layer interference occurs during multi-layer mixed oil extraction, affecting crude oil production. The purpose is to provide a downhole wired intelligent extraction system and method, which controls the flow rate from the outside of the tubing to the inside of the tubing in the corresponding oil layer through intelligent control switches, thereby optimizing the fluid ratio of each oil layer, keeping the pressure of each oil layer within a suitable range, reducing inter-layer interference during mixed extraction, and increasing crude oil production.

[0008] This invention is achieved through the following technical solution: A downhole wireline intelligent production system includes several tubings and several through-tube packers. The tubings are located inside the casing, and adjacent tubings are connected by intelligent switches. Each intelligent switch is used to open and close the channel connecting the outside and inside of the tubing. The opening size of the intelligent switch is adjustable to regulate the flow rate from the outside to the inside of the corresponding tubing. The through-tube packers are used to divide the space between the outside of the tubing and the inside of the casing into several independent cavities, and each independent cavity is equipped with a corresponding intelligent switch.

[0009] The beneficial effects of this invention are that a pipe packer is provided to separate the outer side of the tubing from the inner side of the casing into several independent cavities, facilitating the placement of each layer of oil fluid in its corresponding cavity. Several intelligent control switches are also provided to connect adjacent tubing sections, and to control the flow rate of each layer of oil fluid into the tubing cavity, as well as the flow rate from the outer side of the corresponding oil layer to the inner side of the tubing. This optimizes the fluid ratio for each oil layer, ensuring that the pressure of each oil layer remains within a suitable range, reducing inter-layer interference during mixed production, and increasing crude oil production.

[0010] In some embodiments, an upper-in cable and a lower-out cable are also included. The intelligent control switch includes a first intelligent control switch, a second intelligent control switch, and a third intelligent control switch. Each of the first, second, and third intelligent control switches includes a control circuit board. The upper-in cable is connected to the control circuit board of the first intelligent control switch, and the control circuit boards of the first, second, and third intelligent control switches are all connected through the lower-out cable. By setting up the upper-in and lower-out cables, the speed and signal quality of data transmission are ensured, enabling information from inside the well to be successfully transmitted to the control terminal located on the ground. This facilitates the control terminal in obtaining information from inside the well and controlling the corresponding intelligent control switch to perform corresponding operations based on the information. Furthermore, the integrated circuit board and power system of the first control switch are connected to the control circuit boards and power systems of the second and third intelligent control switches. This means that a single microprocessor, control software, and storage components are installed within the three intelligent control switches, achieving centralized control, shared test data, and shared power. The control software pre-sets the operating modes of the three switches.

[0011] In some embodiments, the first, second, and third intelligent control switches each include an intelligent valve body, an intelligent valve housing, and an upper end, which are connected to form a closed annular cavity. This seals the intelligent control switch as a single unit, preventing oil from arbitrarily entering the inner side of the intelligent control switch and ensuring its normal operation. It also facilitates the transmission of hydraulic commands from the tubing, eliminates the possibility of formation contamination by the working medium, reduces the amount of downhole tools used, and simplifies the tubing string structure.

[0012] In some embodiments, the first, second, and third intelligent control switches are each provided with an inlet hole on their outer side and an outlet hole and a fan-shaped flow channel on their inner side. The inlet hole and the outlet hole are connected to the fan-shaped flow channel. The outlet hole and the inlet hole are respectively connected to the outer side and the inner cavity of the oil pipe. A rotary switch is installed inside the inlet hole, and a screen tube with fine slits is provided on the outer side of the inlet hole. By providing a fan-shaped flow channel to connect the inlet hole and the outlet hole, and installing a rotary switch inside the inlet hole, it is convenient to control the oil located outside the oil pipe to enter the inner side of the oil pipe through the rotary switch. During operation, the rotary switch is turned on, and the oil outside the oil pipe enters from the inlet hole into the fan-shaped flow channel, then from the fan-shaped flow channel into the outlet hole, and finally into the inner cavity of the oil pipe.

[0013] In some embodiments, the first, second, and third intelligent control switches all include drive motors, and each rotary switch includes a valve core, a valve sleeve, and a connecting shaft. The drive motor is installed in the annular cavity and located above the inlet hole. The output shaft of the drive motor is connected to the connecting shaft, and the connecting shaft is connected to the valve core. The valve core and the valve sleeve constitute a rotary switch. A check valve is provided at the inlet end of the outlet hole. The control circuit board and power system are electrically connected to the corresponding drive motor. A rotary switch with low driving resistance and simple structure is provided at the front end of the inlet hole, and a fixed valve, i.e., a check valve, with a special structure for oil pumps is configured 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 a conventional pump. Since the rotary switch only operates during layer metering and production layer adjustment, its operating frequency is extremely low. As long as the corrosion and scale prevention of the switch surface is solved, the service life of the intelligent control switch can be improved.

[0014] In some embodiments, the system further includes a surface cable, a wellhead control cabinet, a wireless transmitter, and a computer. The surface cable is connected to the up-entry cable, and the other end of the surface cable is connected to the wellhead control cabinet. The wireless transmitter is connected to the wellhead control cabinet and is communicatively connected to the computer. This facilitates the collection of well-hole information through the control cabinet and the transmission of this information to the computer via the wireless transmitter. The computer then controls the corresponding intelligent control switches to perform corresponding operations based on the well-hole information.

[0015] In some embodiments, the system further includes a lower pump and an upper pump, the pump housings of which are located at the upper and lower ends of the first intelligent control unit, respectively. The lower pump includes a lower plunger, and the upper pump includes an upper plunger. The upper and lower plungers are connected as a single unit. The upper plunger is provided with a traveling valve and an upper pump discharge valve, and the lower plunger is provided with a lower pump discharge valve. The upper pump discharge valve is used to open and close the channel between the upper pump chamber and the inner cavity of the upper plunger, and the lower pump discharge valve is used to open and close the channel between the lower pump chamber and the inner cavity of the lower plunger. The traveling valve is used to open and close the channel between the inner cavity of the upper plunger and the inner cavity of the lower plunger. When the combined plunger, formed by the upper and lower plungers, moves upward from the lower starting point, the traveling valve, the drain valve, and the lower pump drain valve are simultaneously closed. The liquid in the upper part of the combined plunger is lifted out of the upper pump barrel and discharged from the wellhead through the tubing. The pressure in the upper pump chamber and the lower pump chamber gradually increases, reducing the valve ball opening. The two layers of liquid enter the upper and lower pump chambers respectively. When the combined plunger reaches the upper starting point, the oil gradually fills both pump chambers. When the sucker rod drives the combined plunger downward from the upper starting point, the upper pump chamber and the lower pump chamber gradually become smaller, and the pressure inside the chambers increases. Then, the drain valve and the lower pump drain valve are opened, and the oil in the two pump chambers is discharged to the upper part of the combined plunger through the traveling valve, thus completing one working cycle.

[0016] In some embodiments, the first, second, and third intelligent control switches are each provided with an inner pressure guiding hole and an outer pressure guiding hole. The outer pressure guiding hole communicates with the outside of the oil pipe, and the inner pressure guiding hole communicates with the inside of the oil pipe. An external pressure gauge is provided on the outer pressure guiding hole, and an internal pressure gauge is provided on the inner pressure guiding hole. This facilitates the acquisition of the pressure of the corresponding oil layer outside the oil pipe and the pressure inside the oil pipe using the external and internal pressure gauges, respectively.

[0017] In some embodiments, the device further includes a collector and a thin steel pipe. The thin steel pipe comprises several thin steel pipes, which are used to connect the annular cavity of the pipe-fixing valve to the inner cavity of the collector, to connect the inner cavity of the collector to the hydraulic cylinder cavities of the second pipe-fixing packer and the first pipe-fixing packer, and to connect the inner pressure cavities of the second intelligent control switch and the third intelligent control switch. This facilitates the installation and inspection at the wellhead. After injecting mechanical oil into the thin steel pipe and passing the pressure test, the pipe is inserted into the annular cavity of the pipe-fixing valve, sealed with a sealing cap, and connected to a computer via the communication interface of the intelligent control switch to test whether each switch is operating normally.

[0018] In some embodiments, the upper end of the first intelligent control switch is connected to the upper pump cylinder and the upper pump outer tube, and the lower end is connected to the lower pump cylinder and the lower pump outer tube, respectively. The inner cavity of the connecting pipe in the annular cavity of the first intelligent control switch is connected to the annular space of the upper pump and the annular space of the lower pump.

[0019] In some embodiments, a pipe fixing valve is also included, the lower end of which is connected to the lower pump column, and the upper end is connected to the lower pump housing and the lower pump outer pipe, respectively. The pipe fixing valve is used to open and close the channel between the inner cavity of the lower pump column and the lower pump cavity.

[0020] The present invention also provides a downhole wired intelligent mining method, implemented based on the downhole wired intelligent mining system according to any one of claims 1-10, comprising the following steps: S1, the lower part of the second through-pipe packer is sequentially connected to the collector, the third intelligent control switch, the oil pipe and the plug; including the connection of the collector through the lower thin steel pipe, and the connection of the thin steel pipe between the collector and the second through-pipe packer; S2, the lower part of the first through-pipe packer is connected to the central collector and the second intelligent control switch in sequence; including the connection between the lower thin steel pipe and the central collector, and the connection between the central collector and the first through-pipe packer; S3, Wellhead Installation Inspection: After injecting mechanical oil into the thin steel pipe and passing the pressure test, connect it to the pipe fixing valve, connect it using the upper cable of the first intelligent control switch, test whether each switch is normal, until the wellhead; S4, Production string enters the well: The upper pump outer pipe is connected to the anchor unloader, the anchor unloader is connected to the tubing and moved down to the designed locking point position; S5, Formation Separation: Pressurize the tubing and sequentially seat the cable-anchored unloader and all the through-pipe packers to separate the outside of the tubing from the inside of the casing into several independent cavities; S6, Lowering the plunger into the production pump and opening the well: Connect the upper plunger with the sucker rod, lower it into the production pump, install the wellhead and pumping equipment, and start oil production.

[0021] S7 can perform stratified metering of each oil layer by controlling the corresponding intelligent control switch to open or close; The stratified metering includes the following steps: S71: Set all 3 intelligent control switches to full open for 3-5 days of production; drain residual fluid from the well and restore the well to its original production status. S72, turn on any one of the first, second and third intelligent control switches, and each intelligent control switch will produce independently for 3-5 days, and obtain oil production data for the three layers respectively; S73, based on the oil production data obtained in step S7, produce the oil layer corresponding to the first intelligent control switch, and simultaneously produce the oil layer with the highest oil production among the oil layers corresponding to the second and third intelligent control switches, so as to achieve independent production of the two oil layers. This solves the problem of inter-layer interference in the simultaneous exploitation of two oil layers in the existing technology, and at the same time improves the oil well development efficiency and increases the oil well production.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. It solved the problem of inter-layer interference when multiple oil layers are mixed in the same well, while increasing the oil production of a single well and improving the overall development efficiency of the oilfield.

[0023] 2. The dual-pipe intelligent control pump structure overcomes the problem of small-diameter pumps being prone to bending under directional loads, enhancing the ability to adapt to different well conditions; and solves the problem of hydraulic transmission channels through the pump.

[0024] 3. The thin steel pipe branching off from the collector in the pump run connects the hydraulic cylinder chambers of multiple packers, improving the packers' ability to withstand bidirectional differential pressure, reducing the amount of downhole tools used, and simplifying the run structure.

[0025] 4. A rotary switch with low driving resistance and simple structure is set at the front end of the liquid inlet channel, and a fixed valve with a special structure for oil pumps, namely a check valve, is configured 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 rotary switch only operates when metering and adjusting the production layer, its working frequency is extremely low. As long as the problem of corrosion prevention and scale prevention on the switch surface is solved, the service life of the intelligent control switch can be improved.

[0026] 5. A pump chamber pressure gauge that can be set on the first intelligent control switch enables pump chamber pressure monitoring and allows for understanding of pressure change characteristics during pump chamber suction and discharge.

[0027] 6. The present invention adds a filter screen tube at the front end of the liquid inlet of the first intelligent control switch to prevent mechanical residue from entering the liquid inlet channel of the switch, thus cleaning the flowing medium and further improving the working environment of its two moving parts, thereby further improving the service life of the intelligent control switch. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, 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 the present invention 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 central sectional view of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 For the present invention Figure 1 Cross-sectional view of DD; Figure 5 For the present invention Figure 1 Cross-sectional view of D1-D1; Figure 6 For the present invention Figure 4 Cross-sectional view of BB; Figure 7 For the present invention Figure 4 Cross-sectional view of CC.

[0029] The markings and corresponding component names in the accompanying drawings of the instruction manual: Third intelligent control switch 6, second intelligent control switch 13, lower pump housing 16, connecting pipe 11, second through-pipe packer 9, first through-pipe packer 14, through-pipe fixing valve 15, lower pump outer pipe 17, lower pump barrel 18, lower pump annulus 28, upper pump annulus 27, sucker rod 25, cable anchoring unloader 24, combined plunger 22, upper pump outer pipe 21, upper pump barrel 20, oil pipe 26, straightening connector 23, first intelligent control switch 19, valve sleeve 6-3, coupling shaft 6-4, Drive motor; 6-5, Housing; 6-6, Internal pressure gauge; 6-7, Upper end; 6-8, External pressure gauge; 6-9, Fan-shaped flow channel; 6-10, Internal pressure measuring chamber; 6-11, Thermometer; 6-12, Circuit board and power supply system; 6-13, External pressure guide hole; 6-17, One-way valve; 6-16, Intelligent valve body; 19-1, Intelligent valve housing; 19-2, Internal pressure guide hole; 19-3, Connecting pipe; 19-4, Internal connecting hole; 19-5, Floating valve; 22 -1, Upper pump plunger 22-2, Upper pump drain valve 22-3, Parallel channel 22-4, Lower pump plunger 22-5, Upper pump chamber 22-6, Lower outlet cable 29, Lower pump drain valve 22-7, Outlet hole 6-21, Inlet hole 6-22, Guide hole 6-23, Annular cavity 15-1, Valve ball 15-2, Lower pump inner cavity 16-1, Cylinder cavity 14-1, Cylinder cavity 9-1, Sleeve 2, Oil pipe short section 4, Oil pipe plug 3, Screen pipe 5, Intelligent control switch 6-1, valve core 6-2, fan-shaped flow channel 19-6, cable outlet 19-7, external pressure guide hole 19-8, liquid inlet hole 19-10, liquid outlet hole 19-9, circuit board 19-11, communication interface 19-12, sealing plug 19-13, upper inlet cable 30, surface cable 31, wellhead control cabinet 32, wireless transmitter 33, computer 34, central collector 8, first through-pipe packer 14, second through-pipe packer 9. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0031] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] In the description of this invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0033] The terms "first," "second," etc., used in this invention are merely for clarity of description and are not intended to limit any order or emphasize importance. Furthermore, the term "connection" as used herein, unless otherwise specified, can refer to a direct connection or an indirect connection via other components. Example

[0034] A wired intelligent mining system for underground wells, see [link / reference] Figures 1-7 It mainly includes: tubing and tubing sections, anchor unloader 24, upper pump, first intelligent control switch, lower pump, combined plunger, screen pipe, through-fixed valves, thin steel pipe, collector, second and third intelligent control switches, and first and second through-pipe packers; several tubing sections 26 and tubing sections are used to connect the various components to form a complete system. Figure 1 As shown; the downhole cabled intelligent production system is installed inside the casing 2. Each intelligent control switch is used to open and close the channel connecting the outside of the tubing 26 and the inside of the tubing 26. The opening size of the intelligent control switch is adjustable to regulate the flow rate from the outside of the tubing 26 to the inside of the tubing 26. The through-tube packer is used to divide the outside of the tubing 26 and the inside of the casing 2 into several independent cavities. Each independent cavity is equipped with a corresponding intelligent control switch.

[0035] Specifically, casing 2 has through holes corresponding to the oil layer sections, allowing oil from each oil layer to enter the outer side of the corresponding oil pipe. See also Figure 1The downhole cable-operated intelligent production string is lowered into the oil well; the first and second through-tube packers are positioned in the interlayer between oil layers 1 and 2 and oil layers 2 and 3, dividing the space between the outside of the tubing and the inside of the casing into three independent cavities, with each of the three intelligent control switches connected to one of these independent cavities; the thin steel pipe and the collector transmit the hydraulic power from the annulus of the upper pump, the first intelligent control switch, and the lower pump to the hydraulic cylinders of the first and second through-tube packers; the adjustment commands from the surface are transmitted to the three intelligent control switches via cables, and the opening size of the intelligent control switches is adjustable; the upper pump and the lower pump correspond to their respective oil layers, enabling independent production of the two layers. The cabled intelligent production string can be equipped with N through-tube packers to separate the outside of the tubing from the inside of the casing into N+1 independent cavities. Each independent cavity corresponds to an oil layer and a smart control switch. The smart control switch controls the entry of each layer of oil into the tubing cavity and the cavities of the upper and lower pumps. The external pressure gauge on each smart control switch is used to monitor formation pressure changes, thereby obtaining the flowing pressure and pressure recovery status of each oil layer. By sequentially operating the switches, the produced fluid of each oil layer is collected, i.e., stratified metering, to obtain the oil production of each production layer of the well. Thus, oil layers 2, 3, 4, etc., can be selected and independently produced simultaneously with oil layer 1, completely solving the inter-layer contradictions when producing layers in the same well, enabling the well to obtain the optimal oil production and improving the well's production efficiency. The internal pressure gauge can be used to monitor pump cavity pressure changes.

[0036] See Figure 1 The downhole cable-operated intelligent mining system includes an upper pump with an outer pipe 21, a centralizing connector 23, an upper pump cylinder 20, a first intelligent control switch 19, and a screen pipe 5. The lower pump includes a lower pump cylinder 18, a lower pump housing 16, a lower pump outer pipe 17, a through-pipe fixing valve 15, and a combined plunger 22 integrating the upper and lower pump plungers. The upper outer port of the intelligent valve housing 19-2 of the first intelligent control switch is threaded to the pump outer pipe 21, and its inner port is threaded and sealed to the upper pump cylinder 20. The outer circle of the upper pump cylinder 20 and the inner hole of the pump outer pipe 21 form an upper pump annulus 27. The lower outer port of the intelligent valve housing 19-1 of the first intelligent control switch is threaded to the screen pipe 5, and its lower inner hole is connected to the lower pump cylinder. The upper outer end of the pump cylinder 18 is sealed and connected to the lower inner hole and the lower pump outer tube 17. The lower pump outer tube 17 is sealed and threaded to the upper end of the through-pipe fixing valve 15. The lower end of the lower pump cylinder 18 is sealed and threaded to the upper end of the lower pump housing 16. The lower end of the lower pump housing 16 is sealed and threaded to the upper inner end of the through-pipe fixing valve 15. The lower pump cylinder 18, the lower pump housing 16 and the lower pump outer tube 17 form a lower pump annulus 28. The upper pump annulus 27 and the lower pump annulus 28 are connected by the connecting pipe 19-4 of the first intelligent control switch 19, and at the same time connected to the annulus 15-1 of the through-pipe fixing valve 15 to form a hydraulic passage for pumping. The through-pipe fixing valve 15 is provided with a hydraulic transmission connection port.

[0037] See Figure 1Specifically, the intelligent control switch is equipped with an internal pressure gauge 6-7 for detecting the pressure inside the oil pipe 26 and an external pressure gauge 6-9 for detecting the pressure outside the oil pipe 26, so as to detect the pressure inside and outside of each oil pipe. The pressure data is uploaded to the ground control cabinet and sent to the computer in real time through the steel pipe cable, and the pressure value of each oil layer and the corresponding internal pressure value of the oil pipe can be obtained directly.

[0038] See Figure 1 The packer includes a second packer 9 and a first packer 14, which are used to separate oil layer 3, oil layer 2 and oil layer 1 sequentially from bottom to top. The packer has at least two through-holes: one for a thin steel pipe and the other for a steel cable. The through-holes at both ends are sealed to the steel pipe with sealing caps 10. The through-holes can extend from the packer body or through a central hole; this invention provides a structure where the through-hole extends from the packer body.

[0039] See Figure 1 The upper outer port of the smart valve housing 19-2 of the first smart control switch is threaded to the pump outer pipe 21, and the inner port is threaded and sealed to the upper pump cylinder 20. The outer circle of the upper pump cylinder 20 and the inner hole of the pump outer pipe 21 form an upper pump annulus 27. The upper pump cylinder 20 stands upright inside the upper pump outer pipe 21, and the straightening connector 23 at the upper end of the upper pump cylinder 20 is in gap contact with the inner wall of the upper pump outer pipe 21. The lower outer port of the smart valve housing 19-1 of the first smart control switch is threaded to the screen pipe 5, the lower inner small hole is sealed to the upper outer end of the lower pump cylinder 18, and the lower large inner hole is sealed and threaded to the lower pump outer pipe 17. The lower pump outer pipe 17 is sealed and threadedly connected to the upper end of the through-pipe fixing valve 15. The lower end of the lower pump barrel 18 is sealed and threadedly connected to the upper end of the lower pump housing 16. The lower end of the lower pump housing 16 is sealed and threadedly connected to the upper inner end of the through-pipe fixing valve 15. The lower pump barrel 18, the lower pump housing 16 and the lower pump outer pipe 17 form a lower pump annulus 28. The upper pump annulus 27 and the lower pump annulus 28 are connected by the connecting pipe 19-4 of the first intelligent control switch 19, and at the same time connected to the annulus 15-1 of the through-pipe fixing valve 15 to form a hydraulic passage for pumping. The through-pipe fixing valve 15 is provided with a hydraulic transmission connection port.

[0040] See Figure 1 and Figure 2 It also includes an upper inlet cable 30 and a lower outlet cable 29. The intelligent control switch includes a first intelligent control switch 19, a second intelligent control switch 13, and a third intelligent control switch 6. The first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6 all include circuit boards. The upper inlet cable 30 is connected to the circuit board 19-11 of the first intelligent control switch 19. The circuit boards 19-11 of the first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6 are all connected through the lower outlet cable 29.

[0041] See Figure 1and Figure 2 It also includes a surface cable 31, a wellhead control cabinet 32, a wireless transmitter 33, and a computer 34. The surface cable 31 is connected to the upper inlet cable 30, and the other end of the surface cable 31 is connected to the wellhead control cabinet 32. The wireless transmitter 33 is connected to the wellhead control cabinet 32 ​​and can transmit information to the remote computer 34. The lower outlet cable 29 extends along the length of the tubing and is vertically arranged along the side wall of the tubing. The upper inlet cable 30 and the lower outlet cable 29 connect the circuit boards of multiple intelligent switches into one unit, which can send control actions from the wellhead control cabinet or a remote computer. Several intelligent switches can operate independently as working units.

[0042] See Figures 1 to 3 The intelligent control switch includes a first intelligent control switch 19, a second intelligent control switch 13, and a third intelligent control switch 6. Each of these switches includes an intelligent valve body 19-1, an intelligent valve housing 19-2, and an upper end 6-8. The intelligent valve body 19-1, housing 19-2, and upper end 6-8 are connected to form a closed annular cavity. The built-in control circuit and power system are electrically connected to the drive motor 6-5 and located within the annular cavity. Each built-in control circuit and power system is connected via a lower cable 29. The annular cavity of each intelligent control switch is sealed as a single unit to prevent oil from entering the inner side of the annular cavity, ensuring the normal operation of the intelligent control switch.

[0043] See Figures 1-3 The intelligent control switches, including the first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6, are all provided with inlet holes (6-22, 19-10) on their outer sides and outlet holes (6-21, 19-9) and fan-shaped flow channels (6-10, 19-6) on their inner sides. The inlet holes (6-22, 19-10) and the outlet holes (6-21, 19-9) are connected in series with the fan-shaped flow channels (6-10, 19-6). The inlet holes (6-22, 19-10) and the outlet holes (6-21, 19-9) are respectively connected to the outer side and the inner cavity of the oil pipe. The inlet hole (6-22) A rotary switch is installed inside the inlet holes (6-22, 19-10). A screen tube 5 is provided on the outside of the inlet of each inlet hole (6-22, 19-10). The rotary switch is installed inside the inlet holes (6-22, 19-10) to facilitate the control of the oil outside the oil pipe to enter the oil pipe inside. When the rotary switch is turned on, the oil outside the oil pipe enters the fan-shaped flow channel (6-10, 19-6) from the inlet hole (6-22, 19-10), and then enters the outlet hole (6-22, 19-10) from the fan-shaped flow channel (6-10, 19-6), and then enters the inner cavity of the oil pipe. When the rotary switch is turned off, the oil stops flowing.

[0044] See Figures 1 to 3 Each of the first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6 has a liquid guide hole 6-23, an upper end 6-8, and a thermometer 6-12 within its annular cavity. The upper end 6-8 is connected to the inner side of the intelligent valve housing 19-2 and located above the drive motor 6-5. One end of the liquid guide hole 6-23 communicates with the inner side of the corresponding oil pipe 26, and the other end is located inside the upper end 6-8. The thermometer 6-12 is mounted on the liquid guide hole 6-23. This allows the temperature of the inner cavity of the corresponding oil pipe 26 to be obtained for each intelligent control switch.

[0045] See Figures 1 to 7 The first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6 are each equipped with an inner pressure guiding hole 19-3 and an outer pressure guiding hole 6-17. The outer pressure guiding hole 6-17 communicates with the outside of the oil pipe, and the inner pressure guiding hole 19-3 communicates with the inside of the oil pipe. An external pressure gauge 6-9 is installed on the outer pressure guiding hole 6-17, and an internal pressure gauge 6-7 is installed on the inner pressure guiding hole 19-3. This allows for the acquisition of the pressure of the corresponding oil layer outside the oil pipe and the pressure inside the oil pipe, respectively, through the external pressure gauge 6-9 and the internal pressure gauge 19-3. A pump chamber pressure guiding hole can be added to the first intelligent control switch 19, and a pump chamber pressure gauge can be installed on the pump chamber pressure guiding hole.

[0046] See Figures 1 to 7 The first intelligent control switch 19, the second intelligent control switch 13 and the third intelligent control switch 6 all include a drive motor 6-5. The rotary switches all include a valve core 6-2, a valve sleeve 6-3 and a connecting shaft 6-4. The drive motor 6-5 is installed in the annular cavity and located above the liquid inlet (6-22, 19-10). The output shaft of the drive motor 6-5 is connected to the connecting shaft 6-4. The connecting shaft 6-4 is connected to the valve core 6-2. A one-way valve is provided at the inlet end of the liquid outlet (6-21, 19-9). The inlet port (6-22, 19-10) is equipped with a rotary switch with low driving resistance and simple structure at the rear end. The outlet port (6-21, 19-9) is equipped with a fixed valve with a special structure for oil pumps at the front end. That is, valve seat 6-16 and valve ball 6-15 are placed in the round hole in sequence and locked and sealed with valve cover 6-14 to withstand the high pressure differential environment and frequent operation of the pump. Its service life is the same as that of conventional pumps. Since the rotary switch only operates when layer metering and adjusting the production layer, its working frequency is extremely low. As long as the anti-corrosion and anti-scaling problems of the switch surface are solved, the service life of the intelligent control switch can be improved.

[0047] See Figures 1 to 7Each of the first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6 has a liquid inlet 6-22 on the lower outer side of its main body. A screen tube 5 is installed on the outer side of the inlet of each liquid inlet 6-22. By adding a filter screen tube 5 to the front end of the liquid inlet of the intelligent control switch, mechanical residue is prevented from entering the switch flow channel, thus cleaning the flowing medium. This further improves the working environment of the two moving parts and extends the service life of the intelligent control switch.

[0048] See Figures 1 to 7 It also includes a lower pump and an upper pump. The pump housings of the lower pump and the upper pump are located at the lower end and the upper end of the first intelligent control, respectively. The lower pump includes a lower plunger, and the upper pump includes an upper plunger. The upper plunger and the lower plunger are connected as a combined plunger 22. The upper plunger is provided with a traveling valve 22-1 and an upper pump drain valve 22-3. The lower plunger is provided with a lower pump drain valve 22-7. The upper pump drain valve 22-3 is used to open and close the channel between the upper pump chamber 22-6 and the inner cavity of the upper plunger. The lower pump drain valve 22-7 is used to open and close the channel between the lower pump chamber and the inner cavity of the lower plunger. The traveling valve 22-1 is used to open and close the common channel for the converging oil from the inner cavity of the upper plunger and the inner cavity of the lower plunger to enter the inner cavity of the upper pump cylinder 20. When the combined plunger 22, which is formed by the upper and lower plungers, moves upward from the lower starting point, the traveling valve 22-1, the drain valve, and the lower pump drain valve 22-7 are closed simultaneously. The liquid in the upper part of the combined plunger 22 is lifted out of the upper pump barrel 20 and discharged from the wellhead through the tubing 26. The volume of the upper pump chamber 22-6 and the lower pump inner chamber 16-1 gradually increases, and the pressure reduction valve ball 15-2 opens. The liquid in the two oil layers enters the upper and lower pump chambers respectively. When the combined plunger 22 reaches the upper starting point, the oil gradually fills the two pump chambers. When the sucker rod 25 drives the combined plunger 22 to move downward from the upper starting point, the volume of the upper pump chamber 22-6 and the lower pump inner chamber 16-1 gradually decreases, and the pressure in the chambers increases. Then, the upper pump drain valve 22-3 and the lower pump drain valve 22-7 are opened, and the oil in the two pump chambers is discharged to the upper part of the combined plunger 22 through the traveling valve 22-1, thus completing one working cycle.

[0049] See Figures 1 to 7 The outer diameter of the upper plunger is larger than that of the lower plunger. A parallel channel 22-4 is provided axially on the upper pump discharge valve 22-3. Two sets of lower pump discharge valves 22-7 are installed inside the lower pump plunger. The length of the lower plunger is more than 3.8 times that of the upper plunger. The two pumps are matched with a larger pump on top and a smaller pump on the bottom, which facilitates the lowering of the combined plunger 22 from the wellhead, reduces the downward resistance of the combined plunger 22, and improves its adaptability to complex well conditions.

[0050] See Figures 1 to 7It also includes a pipe fixing valve 15, the lower end of which is connected to the oil pipe 26, and the upper end is connected to the lower pump housing 16 and the lower pump outer pipe 17 respectively. The pipe fixing valve 15 is used to open and close the channel between the inner cavity of the oil pipe 26 and the lower pump cavity. Specifically, the lower pump outer pipe 17 is threadedly sealed to the upper end of the pipe fixing valve 15, the lower end of the lower pump cylinder 18 is threadedly sealed to the upper end of the lower pump housing 16, and the lower end of the lower pump housing 16 is threadedly sealed to the upper inner end of the pipe fixing valve 15. After inserting a thin steel pipe 11 into the connection port of the annular cavity 15-1 of the pipe fixing valve 15 and locking it in place, the hydraulic pressure from the pump can be transferred to the pump.

[0051] See Figures 1 to 7 It also includes a collector 8, a pipe section 12, a sealing cap 10, and several thin steel pipes 11. One end of each thin steel pipe 11 is connected to the annular cavity 15-1 of the pipe fixing valve 15, and the other end is connected to the inner cavity of the collector 8. The thin steel pipe 11 extends from the lower end of the collector 8 and is connected to the hydraulic cylinder cavities 9-1 and 14-1 of the second pipe packer 9 and the first pipe packer 14, respectively. The thin steel pipe 11 is inserted into the pipe holes of each cavity and locked and sealed with the sealing cap 10. Before the thin steel pipe 11 is connected to the annular cavity 15-1 of the pipe fixing valve 15, mechanical oil can be injected into the thin steel pipe 11 for pressure testing. After passing the test, it is inserted into the annular cavity 15-1 of the pipe fixing valve 15 and locked and sealed with the sealing cap 10.

[0052] See Figures 1-7 Each of the intelligent control switches is equipped with an internal pressure gauge, a formation pressure gauge, and a thermometer. A pump chamber pressure gauge can be added to the first intelligent control switch. Pressure guiding holes and fluid guiding holes leading to the target test are provided within the switch body. This enables the measurement of pressure and temperature parameters inside and outside the pump chamber and oil pipe corresponding to each intelligent control switch. It includes an intelligent control body 6-1, on which an external pressure gauge 6-9 is installed and connected to an external pressure guiding hole 6-17. An internal pressure gauge 6-7 is installed on the upper end 6-8 and connected to a pressure guiding hole 6-11, and a thermometer 6-12 is installed and connected to a fluid guiding hole 6-23.

[0053] See Figures 1-7 The upper pump annulus 27 and the lower pump annulus 28 are connected by the connecting pipe 19-4 of the first intelligent control switch 19, and are also integrated with the annulus 15-1 of the through-pipe fixed valve 15. The upper small inner hole of the intelligent valve shell 19-2 is sealed and threadedly connected to the upper pump cylinder 20, and the upper large inner (or outer) hole is sealed and threadedly connected to the upper pump outer tube 21. The outer circular surface of the upper pump cylinder 20 and the inner circular surface of the upper pump outer tube 21 form the upper pump annulus 27. The upper pump cylinder 20 stands upright in the upper pump outer tube 21. The straightening connector 23 at the upper end of the upper pump cylinder 20 is in gap contact with the inner wall of the upper pump outer tube 21. The lower outer port of the intelligent valve body 19-1 is threadedly connected to the screen tube 5. The outer circle of the lower pump plunger 22-5 at the lower part of the combined plunger 22 and the inner hole of the upper pump cylinder 20 form the upper pump cavity 22-6.

[0054] In this embodiment, the upper pump and lower pump can be separated into two single-pump intelligent sampling systems. The upper pump intelligent sampling system includes: an upper pump outer pipe 21, a straightening connector 23, an upper pump cylinder 20, an upper pump plunger, and a pipe fixing valve 15, etc. The upper pump outer pipe 21 is connected to the upper end of the pipe fixing valve 15 with a sealing thread, and the lower end of the upper pump cylinder 20 is connected to the upper inner end of the pipe fixing valve 15 with a sealing thread. The lower part of the pipe fixing valve 15 is connected to the second intelligent control switch, the second pipe sealing barrier, and the third intelligent control switch of the present invention.

[0055] Similarly, the lower pump intelligent sampling system includes: a lower pump outer pipe 17, a straightening connector 23, a lower pump cylinder 18, a lower pump housing 16, a lower pump outer pipe 17, a lower pump plunger, and a pipe fixing valve 15, etc.; the lower pump outer pipe 17 is connected to the upper end of the pipe fixing valve 15 with a sealing thread, the lower end of the lower pump cylinder 18 is connected to the upper end of the lower pump housing 16 with a sealing thread, and the lower end of the lower pump housing 16 is connected to the upper inner end of the pipe fixing valve 15 with a sealing thread; the lower part of the pipe fixing valve 15 is connected to the second intelligent control switch, the second pipe sealing barrier, and the third intelligent control switch of the present invention.

[0056] In this embodiment, the outer tube of the tubular pump can be replaced with the outer working cylinder of the rod pump. The outer working cylinder is connected to the upper end of the through-pipe fixing valve 15 with a sealing thread. The lower locking sleeve of the rod pump is connected to the upper inner end of the through-pipe fixing valve 15 with a sealing thread. The rod pump is connected to the sucker rod and lowered. The locking head at the lower end of the rod pump and the locking sleeve cooperate to seal, thus forming a downhole wired intelligent production system. Example

[0057] The present invention also provides a downhole wired intelligent mining method, implemented based on the downhole wired intelligent mining system according to any one of claims 1-10, comprising the following steps: S1, the lower part of the second through-pipe packer is connected in sequence to the tubing short section, the collector 8, the tubing short section, the third intelligent control switch, the tubing and the plug, etc., and is lowered into the well (inside the casing); the lowered steel pipe cable is connected to the upper cable of the third intelligent control switch, and the lowered thin steel pipe is connected to the cylinders of the collector 8 and the second through-pipe packer respectively. S2, the lower part of the first through-pipe packer is sequentially connected to the oil pipe short section, the central collector 8, the through-pipe short section, the second intelligent control switch, the through-pipe short section, and the central collector 8; the steel pipe cable passing through is connected to the upper cable of the second intelligent control switch, and the lower cable of the second intelligent control switch is connected to the upper cable from the third intelligent control switch; the thin steel pipe passing through is connected to the central collector 8 and the cylinder of the first through-pipe packer; S3, Hydraulic manifold pressure test: After injecting mechanical oil into the thin steel pipe that passes through the first pipe packer and passing the pressure test, connect it to the pipe fixing valve. S4, Communication Test: Connect the computer using the upper cable of the first intelligent control switch to test whether each switch is normal. Communicate once every 10 to 15 tubing sections until the wellhead. S5, production string enters the well: the upper pump outer pipe 21 is connected to the cable anchor unloader 24, the cable anchor unloader 24 is connected to the tubing and moved down to the wellbore design oil layer blocking point; S6, Formation Separation: Pressurize the tubing with 12MPa-15MPa, and seal it sequentially through the cable-anchored unloader 24 and all the through-pipe packers, separating the outside of the tubing from the inside of the casing into several independent cavities; S7, Lowering the plunger and opening the well: Connect the upper plunger with the sucker rod 25, lower it into the upper and lower pumps, install the wellhead and pumping equipment, and start oil production.

[0058] In some embodiments, tiered metering is also included, which includes the following steps: F1: Set all 3 smart control switches to full open for 3-5 days of production; drain residual fluid from the well and restore the well to its original production status. F2 activates any one of the first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6. Each activated intelligent control switch produces oil independently for 3-5 days, and oil production data for the three layers are obtained respectively. F3. Based on the oil production data of the oil layer obtained in step F2, produce the oil layer corresponding to the first intelligent control switch 19, and at the same time produce the oil layer with the highest oil production among the oil layers corresponding to the second intelligent control switch 13 and the oil layer corresponding to the third intelligent control switch 6, so as to achieve independent production of the two oil layers.

[0059] This allows for the control of any smart switch to be activated during stratified metering to obtain corresponding oil production data. Furthermore, during production, the smart switch closest to the ground and the smart switch with the highest oil production among the remaining smart switches can be activated to enable simultaneous extraction of two oil layers. This solves the problem of inter-layer interference during simultaneous extraction of two oil layers, while also improving oil well development efficiency and oil well production.

[0060] It also includes: Installation and inspection: After the thin steel pipe 11 is injected with mechanical oil and pressure tested and qualified, it is inserted into the annulus 15-1 of the pipe fixing valve 15 and locked with the sealing cap 10. The communication test is qualified; Production tubing string is lowered into the well: The upper pump outer pipe is connected to the cable anchor unloader 24, the cable anchor unloader 24 is connected to the tubing 26 and lowered in, the upper cable 30 is fixed on the outside of the tubing, and communication is carried out every 10 to 15 tubings until the design position is reached; Formation separation: The tubing is pressurized to 12 to 15 MPa and the cable anchor unloader 24, the multi-channel first pipe packer 14 and the second pipe packer 9 are set in sequence and the tubing is hung; Lowering the production pump plunger and opening the well: The combined plunger 22 is connected to the sucker rod 25 and lowered into the well. The pump is touched, the anti-impact distance is raised, the wellhead and pumping equipment are installed, and pumping production begins.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wired intelligent mining system for underground wells, characterized in that, The system includes several oil pipes and several through-tube packers. The oil pipes are located inside the casing, and adjacent oil pipes are connected by intelligent switches. The opening size of the intelligent switches is adjustable to regulate the flow rate from the outside of the corresponding oil pipe to the inside of the oil pipe. The through-tube packers divide the space between the outside of the oil pipe and the inside of the casing into several independent cavities, each with a corresponding intelligent switch. The system also includes an upper inlet cable and a lower outlet cable. The intelligent switches include a first intelligent switch, a second intelligent switch, and a third intelligent switch. Each of the first, second, and third intelligent switches includes a circuit board. The upper inlet cable is connected to the circuit board of the first intelligent switch. The circuit boards of the first, second, and third intelligent switches are all connected via the outgoing cable; each of the first, second, and third intelligent switches includes an intelligent valve body, an intelligent valve housing, and an upper end, which are connected to form a closed annular cavity; the outer side of the intelligent valve body of each of the first, second, and third intelligent switches is provided with an inlet hole and a fan-shaped flow channel, and the inner side is provided with an outlet hole. The inlet hole and the outlet hole are both connected to the fan-shaped flow channel. The outlet hole and the inlet hole are respectively connected to the outer side and the inner cavity of the intelligent valve body. A rotary switch is installed in the inlet hole, and a screen tube is provided on the outer side of the inlet of each inlet hole; the first intelligent switch, Both the second and third intelligent control switches include drive motors. Each rotary switch includes a valve core, a valve sleeve, and a connecting shaft. The drive motor is installed within the annular cavity and located above the inlet port. The output shaft of the drive motor is connected to the connecting shaft, which is connected to the valve core. A check valve is provided at the inlet end of the outlet port. The circuit board and power system are electrically connected to the corresponding drive motor. The system also includes a lower pump and an upper pump. The pump housings of the lower pump and the upper pump are located at the lower and upper ends of the first intelligent control switch, respectively. The lower pump includes a lower plunger, and the upper pump includes an upper plunger. The upper and lower plungers are connected as a single unit. A traveling valve and an upper pump discharge valve are provided inside the upper plunger, and a lower pump discharge valve is provided inside the lower plunger. The upper pump discharge valve is used to open and close the channel between the upper pump chamber and the upper plunger inner cavity; the lower pump discharge valve is used to open and close the channel between the lower pump chamber and the lower plunger inner cavity; the traveling valve is used to open and close the channel between the upper plunger inner cavity, the lower plunger inner cavity and the pump upper oil pipe inner cavity; it also includes a pipe fixing valve, the lower end of which is connected to the pump lower tubing, and the upper end is connected to the lower pump housing and the lower pump outer pipe respectively; the pipe fixing valve is used to open and close the channel between the pump lower tubing inner cavity and the lower pump chamber; it also includes a collector and a thin steel pipe, the thin steel pipe including several thin steel pipes, the several thin steel pipes being used to connect the annular cavity of the pipe fixing valve to the inner cavity of the collector, and to connect the inner cavity of the collector to the liquid cylinder cavities of the second pipe packer and the first pipe packer.

2. The downhole cabled intelligent mining system according to claim 1, characterized in that, It also includes a ground cable, a wellhead control cabinet, a wireless transmitter, and a computer. The ground cable is connected to the up-entry cable, and the other end of the ground cable is connected to the wellhead control cabinet. The wireless transmitter is connected to the wellhead control cabinet and is communicatively connected to the computer.

3. The downhole cabled intelligent mining system according to claim 1, characterized in that, The first, second, and third intelligent control switches are each provided with an inner pressure guiding hole and an outer pressure guiding hole. The outer pressure guiding hole communicates with the outside of the oil pipe, and the inner pressure guiding hole communicates with the inner cavity of the oil pipe. An external pressure gauge is provided on the outer pressure guiding hole, and an internal pressure gauge is provided on the inner pressure guiding hole.

4. The downhole cabled intelligent mining system according to claim 1, characterized in that, The upper end of the first intelligent control switch is connected to the upper pump cylinder and the upper pump outer pipe respectively, and the lower end is connected to the lower pump cylinder and the lower pump outer pipe respectively. The inner cavity of the connecting pipe in the annular cavity of the first intelligent control switch is connected to the annular cavity of the upper pump and the annular cavity of the lower pump.

5. A wired intelligent mining method for underground wells, characterized in that, The implementation of the downhole cabled intelligent mining system according to any one of claims 1-4 includes the following steps: S1, the lower part of the second through-pipe packer is connected in sequence to the central collector, the third intelligent control switch, the oil pipe and the plug, the steel pipe cable passing through is connected to the third intelligent control switch, and the thin steel pipe between the central collector and the second through-pipe packer is connected. S2, the lower part of the first conduit packer is connected to the central collector and the second intelligent switch in sequence. The two ends of the second intelligent switch are connected by steel pipe cables. The thin steel pipe between the central collector and the first conduit packer is connected. S3, after injecting mechanical oil into the thin steel pipe and passing the pressure test, connect it to the pipe-fixed valve, and connect it to the computer using the upper cable of the first intelligent control switch to test whether each switch is normal; S4, pressurize from inside the tubing and sequentially seat the cable-anchored unloader and all the through-pipe packers, separating the outside of the tubing from the inside of the casing into several independent cavities; S5 performs stratified metering of each oil layer by controlling the corresponding intelligent control switch to open or close; The stratified metering includes the following steps: S51, set all three intelligent control switches to full open to drain residual fluid from the well during operation; S52, turn on any one of the first, second and third intelligent control switches, and each intelligent control switch will produce independently for 3-5 days, and obtain oil production data for the three layers respectively; S53, based on the oil production data of the oil layer obtained in step S52, produce the oil layer corresponding to the first intelligent control switch, and at the same time produce the oil layer with the highest oil production among the oil layers corresponding to the second and third intelligent control switches, so as to realize the independent production of the two oil layers, or adjust the opening of the second and third switches to maximize the production of crude oil.

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