An intelligent downhole separate recovery system and a separate recovery method

Abstract

The application discloses a downhole intelligent separate production system and a separate production 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. Each intelligent control switch is used for opening and closing a channel between the outer side of the oil pipe and the inner side of the oil pipe. An inner pipe pressure gauge for detecting the pressure of the inner side of the oil pipe and an outer pipe pressure gauge for detecting the pressure of the outer side of the oil pipe are arranged on the intelligent control switch. The through-tubing packer is used for separating the outer side of the oil pipe and the inner side of the casing into a plurality of independent cavities. Each intelligent control switch is located between two corresponding through-tubing packers. The separate production method is implemented based on the downhole intelligent separate production system. The inner pipe pressure gauge for detecting the pressure of the inner side of the oil pipe and the outer pipe pressure gauge for detecting the pressure of the outer side of the oil pipe are arranged on each intelligent control switch, so that the corresponding real-time oil layer pressure is obtained, reasonable working parameters can be formulated, and the best oil production capacity can be obtained.

Description

Technical Field

[0001] This invention relates to the field of oil extraction, and specifically to an intelligent downhole extraction system and extraction 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 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] With breakthroughs in intelligent stratified oil production technology, domestic oilfields have adopted intelligent switching tools to solve the technical bottlenecks of stratified metering and pressure measurement in oil wells. In the process tubing, a combination of tubular pumps, rod pumps and intelligent control switches is used to obtain the oil production of each layer by switching between multiple oil layers downhole. However, the problem of inter-layer interference when two or more layers are produced simultaneously has not been effectively solved.

[0004] The invention patent, "Intelligent Oil Well Production System and Implementation Method Based on Post-Pump Pressure Pulse Control", application number CN202311009033.8, features a production tool string consisting of a single-flow valve, a central liquid-passing screen (22), a packer (29), a plug seal (28), an outer cylinder (18), and a release handle (17), all connected sequentially from bottom to top via tubing. The production tool string also includes an inner cylinder (16), a production divider (26), and a pressure transmission sub (24), all connected sequentially from bottom to top via tubing. 5) The splitter (26) and the pressure transmission sub (25) are connected through the hydraulic line (27) to realize the oil circuit for pressure transmission; the invention has problems: the method and structure of oil tubing pressure being transmitted from the pump to the pump is immature, the hydraulic line is easily damaged, and the difficulty of going down into the well is increased; two tubing strings are required to achieve separation, the process is complicated and the operation is difficult; two switches are set on the splitter (26), which only realizes the production of two oil layers in the well, and the design drawings and instructions do not involve the structure, measures and process schemes to solve the interference between layers.

[0005] The patent "A Separable Subdivided Layer Oil Production Device", patent number ZL201020022611.3, is characterized by the following: the seated layering system mainly consists of an upper connector, a sealing shell, a sealing section, an upper packer, an upper pump shell, an upper pump lower connector, a lower packer, a lower pump shell connector, and a lower pump connector arranged from top to bottom; the separate production and pumping system mainly consists of an upstream moving valve, a downstream moving valve, an upper hollow rod, a lower hollow rod, an upper pump cylinder, a lower pump cylinder, an upper dual-flow moving valve, a lower dual-flow moving valve, a hollow upper pump plunger, and a hollow lower pump plunger. This technology enables independent production of three downhole layers and effectively solves the problem of inter-layer interference, but the issues of layered metering and pressure measurement still need to be addressed.

[0006] The invention patent "A Separate Production Process String and Its Usage Method", application number CN202310155466.8; is characterized in that the inlet of the radial channel of the three pumps is equipped with an intelligent switch assembly (15). Before the intelligent switch is lowered into the well, an automatic control cycle command is input, namely the opening date and closing date, which solves the problem of layered metering well. The invention has the following problems: it does not address the problem of layered pressure measurement; the packer needs to be set twice, and the layered string needs to be lowered into the well and docked twice. The process is complicated and the operation is complex, which brings uncertainty to the one-time success of the process and increases the operating cost; the design drawings and instructions do not include the idea of ​​re-communication between the ground and the intelligent switch assembly (15) or the explanation of the layered production process scheme.

[0007] Currently, when conducting mixed oil extraction, it is impossible to conduct pressure tests on each oil layer, thus preventing the study of the characteristics of each layer and the understanding of the production dynamics of the oil wells. This makes it impossible to formulate reasonable operating parameters and obtain the optimal oil production. Summary of the Invention

[0008] The technical problem this invention aims to solve is that, in current multi-layer independent mining operations, it is impossible to conduct pressure tests on each oil layer, leading to the inability to formulate reasonable operating parameters and obtain optimal production results. The purpose is to provide a downhole intelligent production system and method, in which each intelligent control switch is equipped with an internal pressure gauge for detecting the pressure inside the tubing and an external pressure gauge for detecting the pressure outside the tubing, thereby obtaining the corresponding real-time oil layer pressure. This facilitates the study of the characteristics of each oil layer and the understanding of the production dynamics of the oil well, enabling the formulation of reasonable operating parameters and the achievement of optimal oil production.

[0009] This invention is achieved through the following technical solution: A downhole 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. Each intelligent switch is equipped with an internal pressure gauge for detecting the pressure inside the tubing and an external pressure gauge for detecting the pressure outside the 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.

[0010] The beneficial effects of this invention are that a through-tube packer is used 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 in its corresponding cavity. Several intelligent control switches are also installed to connect adjacent tubing sections, controlling the entry of each layer of oil into the tubing cavity. Each intelligent control switch is positioned between two corresponding through-tube packers. Furthermore, each intelligent control switch is equipped with an internal pressure gauge for detecting the pressure inside the tubing and an external pressure gauge for detecting the pressure outside the tubing, thereby obtaining the real-time pressure of the corresponding oil layer. This facilitates the study of the characteristics of each oil layer and the understanding of the well's production dynamics, enabling the formulation of reasonable operating parameters to achieve optimal oil production.

[0011] In some embodiments, 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 an intelligent valve body, an intelligent valve housing, and an upper end. The intelligent valve body, intelligent valve housing, and upper end 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 internal pressure testing chamber of the intelligent control switch includes a liquid guiding hole, a pressure guiding hole, and a through-pipe hole disposed on the chamber; the liquid guiding hole is connected to a thermometer, the pressure guiding hole is connected to an internal pressure gauge, and a thin steel tube is inserted into the through-pipe hole and connected to the internal pressure testing chambers of multiple intelligent control switches. This enables the acquisition of the temperature and pressure inside the oil pipe corresponding to each intelligent control switch.

[0013] 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 via a ball valve. During operation, the rotary switch is opened, 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.

[0014] In some embodiments, the first, second, and third intelligent control switches all include a drive motor, 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, and a one-way valve is provided at the inlet end of the outlet hole. 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 ball 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, and its service life is consistent with that of conventional pumps. 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. In some embodiments, the first intelligent control switch is equipped with a first circuit board and a power supply system, and the second and third intelligent control switches are each equipped with a second control circuit board and a power supply system. The first circuit board and power supply system are electrically connected to the second control circuit board and power supply system, and the built-in integrated circuit board and power supply system are electrically connected to the corresponding drive motor. Each built-in integrated circuit board and power supply system is connected via a bottom-out cable. Connecting the first circuit board and power supply system to the second control circuit board and power supply system means that a set of microprocessors, control software, and storage components are installed in the three intelligent control switches, realizing centralized control, test data, and power sharing. The control software presets the working state of the three switches. Before entering the well, the communication interface of the first intelligent control switch is used to connect to the computer to test whether each switch is normal.

[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, drain valve, and 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 outer diameter of the upper plunger is larger than the outer diameter of the lower plunger, and the length of the lower plunger is more than 3.8 times the length of the upper plunger. The upper pump is a combination of a long pump barrel and a short plunger, and the lower pump is a combination of a short pump barrel, a lower pump housing, and a long plunger. The outer diameter of the upper plunger is larger than the outer diameter of the lower plunger, and the length of the lower plunger is greater than the length of the upper plunger. The two pumps adopt a structure matching with the larger pump on top and the smaller pump on the bottom, which reduces the downward resistance of the combined plunger and improves the ability to adapt to complex well conditions.

[0017] 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.

[0018] In some embodiments, a pipe-fixing valve is further included. The lower end of the pipe-fixing valve is connected to the oil pipe, 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 passage between the inner cavity of the oil pipe and the lower pump cavity. The pump is connected to the inside of the oil pipe by setting the pipe-fixing valve.

[0019] In some embodiments, the system further includes a collector and thin steel pipes. The thin steel pipes comprise a plurality of 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 and first pipe-fixing packers, and to connect the inner pressure cavities of the second and third intelligent control switches. This facilitates installation and inspection at the wellhead. After injecting mechanical oil into the thin steel pipes and passing the pressure test, the pipes are 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 switches to test whether each switch operates normally. The present invention also provides a method for the production of a downhole intelligent production system, implemented based on the downhole intelligent production 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 central collector, the third intelligent control switch, the oil pipe and the plug; including the steel pipe cable passing through and connected to the third intelligent control switch, the thin steel pipe passing through and connected to the central collector, and the thin steel pipe connecting the central collector to the second through-pipe packer and the third intelligent control switch; S2, the lower part of the first conduit packer is connected to the central collector and the second intelligent switch in sequence; including the steel pipe cable connecting the two ends of the second intelligent switch, and the thin steel pipe connecting the central collector to the first conduit packer and the second intelligent switch; 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, and use the communication interface of the intelligent control switch to connect to the computer to test whether each switch is normal. 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 to 12MPa-15MPa and sequentially set the anchor unloader and all the through-tube 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.

[0020] In some embodiments, tiered metering is also included, which includes the following steps: F1: Set all three intelligent control switches to full open for 3-5 days of production; drain residual fluid from the well to restore the well to its original production state. F2 activates any one of the first, second, and third smart control switches. Each activated smart control switch will produce oil independently for 3-5 days, and oil production data for the three layers will be obtained respectively. F3, based on the oil production data obtained in step S12, produces the oil layer corresponding to the first intelligent control switch, and simultaneously produces the oil layer with the highest production data among the oil layers corresponding to the second and third intelligent control switches, achieving independent production of the two oil layers. This solves the inter-layer interference problem in the simultaneous exploitation of two oil layers in existing technologies, while improving oil well development efficiency and oil well production.

[0021] Specifically, the detailed steps for implementation are as follows: S11, the lower part of the second through-pipe packer is sequentially connected to the tubing short section, the middle 3 collector, 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 outlet of the third intelligent control switch, and the lowered thin steel pipe is connected to the middle 3 collector, the second through-pipe packer and the third intelligent control switch respectively; S12, the lower part of the first through-pipe packer is sequentially connected to the oil pipe short section, the central collector 1, the through-pipe short section, the second intelligent control switch, the through-pipe short section, and the central collector 2; the steel pipe cable passing through it is connected to the cable outlet on the second intelligent control switch, and the cable outlet on the second intelligent control switch is connected to the steel pipe cable from the upper end of the third intelligent control switch; the thin steel pipe passing through the first through-pipe packer 1 is connected to the central collector 1, the first through-pipe packer, and the second intelligent control switch; the thin steel pipe passing through the second intelligent control switch is connected to the central collector 2, and the central collector 2 is connected to the thin steel pipe passing through the second through-pipe packer; S13, Hydraulic manifold pressure test: After injecting mechanical oil into the thin steel pipe passing through the first manifold packer and passing the pressure test, connect it to the manifold fixing valve. S14, Communication Test: Connect the steel pipe cable passing under the first conduit packer to the lower cable outlet of the first intelligent control switch, and connect the communication interface of the first intelligent control switch to the computer to test whether each switch is normal. S15, 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.

[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. A hydraulic manifold running parallel to the tubing below the pump; connecting the annular cavities of multiple intelligent control switches to simultaneously receive hydraulic commands transmitted from the wellhead and tubing; connecting the hydraulic cylinder cavities of multiple packers to improve the packers' ability to withstand bidirectional pressure differentials.

[0025] 4. The hydraulic commands transmitted from the wellhead and tubing avoid the formation contamination caused by the construction medium when commands are transmitted from the annulus, reducing the amount of downhole tools used and simplifying the tubing string structure.

[0026] 5. Multiple intelligent control switches are connected together by communication cables to form a centralized control and resource sharing system, which extends the service life of the underground equipment.

[0027] 6. A rotary switch with low driving resistance and simple structure is set at the front end of the inlet channel, and a fixed valve, i.e. a ball 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 conventional pumps. The rotary switch is set at the front end of the single-flow ball valve, i.e., at the inlet of the inlet channel. The switch has a simple structure and low driving resistance. Since the rotary switch only operates when layered 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 surface of the switch valve body is solved, the service life of the intelligent control switch can be improved.

[0028] 7. This invention can open or close the fluid inlet channel using either program settings or wellhead pressure pulse waves, reducing the frequency of wellhead operations, saving production costs, and enabling two pumps to automatically correspond to their respective oil layers for independent extraction. When extracting more than three oil layers, the corresponding production oil layer for the next pump can be selected automatically or manually, thereby improving oil well development efficiency and increasing oil well production.

[0029] 8. 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

[0030] 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 structural diagram of the sampling section of the present invention; Figure 3 This is a structural diagram of the pump lower tubing section 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 Structural diagram of CC.

[0031] The markings and corresponding component names in the accompanying drawings of the instruction manual: Central collector 8, third intelligent control switch 6, second intelligent control switch 13, lower pump housing 16, thin steel 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, anchor drain 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 6-4, drive motor 6-5, housing 6-6 6-7 Internal pressure gauge, 6-8 Upper end, 6-9 External pressure gauge, 6-10 Fan-shaped flow channel, 6-11 Internal pressure measuring chamber, 6-12 Thermometer, 6-13 Second circuit board and power supply system, 6-17 External pressure guiding hole, 6-16 One-way valve, 19-1 Intelligent valve body, 19-2 Intelligent valve shell, 19-3 Internal pressure guiding hole, 19-4 Connecting pipe, 19-5 Internal connecting hole, 19-5 First circuit board and power supply system System 19-6, 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 port 6-21, Inlet port 6-22, Guide port 6-23, Through-pipe hole 6-24, Annular cavity 15-1, Valve ball 15-2, Lower pump inner cavity 16-1, Cylinder chamber 14-1, cylinder cavity 9-1, sleeve 2, oil pipe short section 4, oil pipe plug 3, screen pipe 5, first 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, communication interface 19-12, sealing plug 19-13, collector 8, first through-pipe packer 14, second through-pipe packer 9. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Example 1 This invention provides a downhole intelligent production system with the following technical effects: First, the upper and lower ends of the first intelligent control switch are integrated with two double-layer tubing pumps, and the annulus formed between the double-layer tubing of the two pumps and the inner cavity of the connecting pipe 19-4 of the first intelligent control switch constitute a hydraulic passage for pumps; Second, a thin steel pipe extending from the through-tube fixing valve is connected to the collector, and a thin steel pipe extending from the collector is connected to the internal pressure testing chambers of the first and second intelligent control switches and the hydraulic cylinder chambers of the two through-tube packers, thus forming a hydraulic manifold parallel to the tubing string, realizing well... The system features six key features: 1) Three intelligent switches that synchronously receive commands and the sealing of the pump's under-pipe packer; 2) The circuit boards and power systems of the three intelligent switches are connected to the control circuits and power systems via the upper inlet and lower outlet cables passing through the packer, enabling data and power sharing; 3) The system implements the filtration function for the pump's liquid inlet, improving the pump's service life; 4) The system uses a program to set the sequential opening and closing of the three intelligent switches, solving the problem of stratified metering; and 5) The system adopts a unidirectional liquid inlet structure with a pre-positioned switch and a post-positioned flow valve, extending the switch's service life.

[0037] See Figures 1-7 The downhole intelligent production system 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 the system. Figure 1 As shown; the downhole intelligent production system is installed inside the casing 2. Each intelligent control switch is used to open and close the channel connecting the outside and inside of the tubing 26. Each intelligent control switch is equipped with an internal pressure gauge 6-7 for detecting the pressure inside the tubing 26 and an external pressure gauge 6-9 for detecting the pressure outside the tubing 26. The through-tube packer is used to separate the outside of the tubing 26 from the inside of the casing 2 into several independent cavities, each with a corresponding intelligent control switch. Specifically, the casing 2 has through holes corresponding to the oil layer locations, allowing oil from each oil layer to enter the corresponding outside of the tubing. The 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 second (third) intelligent control switch. The intelligent control switch controls the entry of each layer of oil into the tubing cavity and the upper and lower pump cavities. The in-tube pressure gauge on each intelligent control switch is used to receive the pressure wave command transmitted from the tubing at the wellhead. By working in sequence with the switches, the produced fluid of each oil layer is collected, i.e., stratified metering, thereby obtaining the oil production of each production layer of the well. Then, oil layers 2, 3, 4, etc., can be selected to be independently produced simultaneously with oil layer 1, which completely solves the inter-layer contradictions when producing layers in the same well, so that the well obtains the best oil production and improves the production efficiency of the well. The external pressure gauge is used to monitor the formation pressure changes, thereby obtaining the flowing pressure and oil layer pressure recovery of each oil layer.

[0038] The upper pump of the intelligent sampling system includes an upper pump outer pipe 21, a straightening 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 in which the upper and lower pump plungers are integrated. 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 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 lower outer port of the intelligent valve housing 19-1 of the intelligent control switch is threaded to the screen pipe 5, and the lower inner hole is connected to the lower pump cylinder 18. The upper outer end is sealed and connected, the lower large inner hole is sealed and threaded to 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 barrel 18 is sealed and threaded to the upper end of the lower pump housing 16, and 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 barrel 18, the lower pump housing 16 and the lower pump outer tube 17 form the 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 the pump hydraulic channel; the through-pipe fixing valve 15 is provided with a hydraulic transmission connection port. The first, second, and third intelligent control switches are all equipped with an internal pressure gauge, a formation pressure gauge, and a thermometer. The first intelligent control switch can be equipped with a pump chamber pressure gauge and a communication interface. Pressure guide holes and liquid guide holes leading to the target test are provided in 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.

[0039] The intelligent valve body of the three intelligent control switches has two parallel channel holes parallel to the axis. A drive motor is installed at the end of one channel hole. The output shaft of the drive motor is connected to the coupling shaft and the valve core in sequence. The valve core and the valve sleeve form a rotary switch. At least one of the other channel holes is equipped with a dedicated one-way valve. The one-way valve is used to control the oil outside the oil pipe to enter the oil pipe inside. When the rotary switch is open, the oil outside the oil pipe enters the fan-shaped flow channel from the inlet hole, then enters the outlet hole from the fan-shaped flow channel, and then enters the inner cavity of the oil pipe. When the rotary switch is closed, it prevents the oil outside the oil pipe from entering.

[0040] The three intelligent control switches have two parallel circular channels that are parallel to the axis inside the intelligent valve body. The lower end of the circular channels is connected by a fan-shaped channel to form the liquid inlet channel of the intelligent control switch.

[0041] In some embodiments, the outer side of the circular hole of the smart valve body of the first smart switch, the second smart switch and the third smart switch is provided with a liquid inlet hole, and a screen tube is provided on the outer side of the inlet of the liquid inlet hole. The channel shape on the screen tube body can be a hole, a thin slit and a wire.

[0042] In some embodiments, the first, second, and third intelligent control switches are equipped with rotary switches at the front end of their inlet ports, which have low driving resistance, rapid switching, and simple structure. The valve core and valve sleeve constitute the rotary switch. Since the rotary switch only operates during layered metering and production layer adjustment, its operating frequency is extremely low. As long as the corrosion and scale prevention issues on the switch surface are properly addressed, the service life of the intelligent control switch can be improved. A one-way valve is provided at the inlet end of the outlet port. The one-way valve is the same as the fixed valve in the oil pump's dedicated structure, namely a ball valve, to withstand the high pressure differential environment and frequent operation of the pump. Its service life remains consistent with that of a conventional pump.

[0043] 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.

[0044] 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 internal pressure measuring chamber and an annular cavity. The built-in integrated circuit and power supply system are electrically connected to the drive motor 6-5 and located within the annular cavity. Each built-in integrated circuit and power supply system is connected via a downward-facing 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.

[0045] See Figures 1 to 3The 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 holes (6-22, 19-10) are equipped with screen tubes 5 on the outer side of their inlets. A rotary switch is installed inside the inlet holes (6-22, 19-10) to control the flow of oil from the outside of the oil pipe to the inside of the oil pipe. When the rotary switch is turned on, the oil from the outside of the oil pipe enters the fan-shaped flow channel (6-10, 19-6) from the inlet holes (6-22, 19-10), and then enters the outlet holes (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.

[0046] See Figure 2 , Figure 3 Each intelligent control switch has multiple testing components mounted on its internal pressure measuring chamber. The second and third intelligent control switches each have a thermometer 6-12, which connects to the central channel of the oil pipe 26 via a liquid guide hole 6-23 on the upper end 6-8. 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. This allows the temperature of the flowing liquid at the location of the second and third intelligent control switches to be obtained.

[0047] See Figures 1 to 7 Each of the three intelligent control switches is equipped with an internal pressure gauge 6-7 and an external pressure gauge 6-9. The internal pressure gauge 6-7 of the first intelligent control switch is connected to the lower pump annulus 28 through the internal pressure guide hole 19-3, and the internal and external pressure gauges 6-9 are connected to the outside of the intelligent control sampling pump through the external pressure guide hole 19-8. The internal pressure gauges 6-7 of the second and third intelligent control switches are connected to the internal pressure measuring chamber 6-11, and the external pressure gauges 6-9 are connected to their respective oil layer annulus through the external pressure guide hole 6-17.

[0048] See Figures 1 to 7The 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. Each rotary switch includes a valve core 6-2, a valve sleeve 6-3, and a connecting shaft 6-4 placed inside a channel circular hole. The drive motor 6-5 is installed in the annular cavity and located above the channel circular hole. The inlet hole (6-22, 19-10) is located below the channel circular hole and communicates with the outside of the oil pipe. The output shaft of the drive motor 6-5 is connected to the connecting shaft 6-4, and the connecting shaft 6-4 is connected to the valve core 6-2. The outlet hole (6-21, 19-9) is located inside the upper end of another channel circular hole and communicates with the inside of the oil pipe (pump cavity). A one-way valve is provided at the inlet end. A rotary switch with low driving resistance and simple structure is set at the rear end of the inlet port (6-22, 19-10). The outlet port (6-21, 19-9) is equipped with a fixed valve with a special structure for oil pumps. The valve seat 6-16 and valve ball 6-15 are placed in sequence in the circular hole of the channel 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.

[0049] The three intelligent control switches have two parallel channel holes that are parallel to the axis inside the intelligent valve body. The lower ends of the channel holes are connected by fan-shaped channels 6-10 and 19-6, forming the liquid inlet channel of the intelligent control switch series structure.

[0050] The three intelligent control switches are equipped with screen tubes on the outside of the inlet holes below the circular holes in the main body of the intelligent valve. The channel shape on the screen tube body can be preferably selected according to the properties of the oil in the oil layer, such as holes, narrow slits, and wires.

[0051] See Figures 1-3Specifically, the upper outer port of the smart valve housing 19-2 of the first smart control switch is threadedly connected to the pump outer pipe 21, and the inner port is threadedly 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 clearance contact with the inner wall of the upper pump outer pipe 21. The lower outer port of the smart valve body 19-1 of the first smart control switch is threadedly connected 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 cavity 15-1 of the through-pipe fixing valve 15 to form a hydraulic passage for pumping. The annulus cavity 15-1 of the through-pipe fixing valve 15 is provided with a hydraulic transmission connection port.

[0052] See Figures 1 to 7 The first intelligent control switch 19 is equipped with a first circuit board and power system 19-6, while the second intelligent control switch 13 and the third intelligent control switch 6 are each equipped with a second control circuit board and power system 6-13. The first circuit board and power system 19-6 are connected to the second control circuit board and power system 6-13 by cable. The built-in integrated circuit board and power system (19-6, 6-13) are electrically connected to the corresponding drive motor 6-5. Each built-in integrated circuit board and power system (19-6, 19-6) is connected via a down-out cable 29. Connecting the first circuit board and power system 19-6 to the second control circuit board and power system 19-6 means that a set of microprocessors, control software, and storage components are installed in the three intelligent control switches, realizing centralized control, test data, and power sharing. The control software presets the working system of the three switches. Before entering the well, the communication interface of the first intelligent control switch 19 is used to connect to a computer to test whether each switch is normal. Each electrical component of the intelligent control switch collects and stores parameters such as pressure and temperature according to the set time. When the oil well is brought to the surface, the communication interface 19-12 of the intelligent control switch is connected to the computer, and the stored parameters can be played back into the computer software and displayed in the form of charts, data and curves.

[0053] See Figures 1 to 7It also includes an upper pump and a lower pump, located at the upper and lower ends of the first intelligent control switch, respectively. The upper pump includes an upper plunger, and the lower pump includes a lower plunger. The upper and lower plungers are connected as a single unit, namely a combined plunger 22. The upper plunger is provided with a traveling valve 22-1 and an upper pump drain valve 22-3, and 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 moves upward from the lower starting point, the traveling valve 22-1, the upper pump discharge valve 22-3, and the lower pump discharge valve 22-7 are simultaneously closed. 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 oil pipe 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 discharge valve 22-3 and the lower pump discharge 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.

[0054] 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. The lower pump plunger is equipped with two sets of lower pump discharge valves 22-7. The length of the lower plunger is more than 3.8 times that of the upper plunger. The two pumps adopt a structure matching with the larger pump on top and the smaller pump on the bottom, which is conducive to the combined plunger 22 being lowered from the wellhead. At the same time, it reduces the downward resistance of the combined plunger 22 and improves the ability to adapt to complex well conditions.

[0055] See Figures 1 to 7 It 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. 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 and sealing it, the hydraulic pressure on the pump can be introduced into the pump.

[0056] See Figures 1 to 7It also includes a collector 8, a pipe section 12, a sealing cap 10, and several thin steel pipes 11, which constitute a hydraulic manifold under the pump. One end of one of the thin steel pipes 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. Three thin steel pipes 11 are led out from the upper and lower ends of the collector 8. One of the thin steel pipes 11 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 remaining thin steel pipes 11 are connected to the inner pressure cavities 6-11 corresponding to the second intelligent control switch 13 and the third intelligent control switch 6, respectively. The thin steel pipes 11 are inserted into the pipe holes of each cavity and locked and sealed with the sealing caps 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. After the hydraulic manifold is tested and qualified, it can be inserted into the annular cavity 15-1 of the pipe fixing valve 15 and locked with the sealing cap 10.

[0057] See Figures 1-7 The intelligent control switch includes an intelligent control body 6-1. Two axial channel holes on the intelligent control body 6-1 are connected by a fan-shaped flow channel 6-10. One hole houses a valve core 6-2, a valve sleeve 6-3, and a connecting shaft 6-4. A drive motor 6-5 drives the valve core 6-2 to rotate via the connecting shaft 6-4. The opening and closing of the channel is achieved by connecting and closing the radial holes on the valve core 6-2 and the valve sleeve 6-3. A valve seat 6-16 is placed sequentially from bottom to top in the other channel hole. The valve ball 6-15 is sealed and pressed against the valve seat 6-16 by the valve cover 6-14. When the pump draws liquid, the oil in oil layer 1 enters the upper pump chamber through the narrow slit 5-1 of the first intelligent control switch, the inlet hole 6-22, the radial through hole on the valve core 6-2 and valve sleeve 6-3, the fan-shaped flow channel 6-10, the valve seat 6-16, and the outlet hole 6-21. Similarly, the oil in oil layers 2 and 3 enters the inner side of the oil pipe through the second and third intelligent control switches, and enters the lower pump chamber 16-1 through the fixed valve ball 15-2. The upper pump inner chamber 22-6 is formed by the outer circle of the lower pump plunger 22-5 at the lower part of the combined plunger 22, the inner cavity of the upper pump cylinder 20, and the first intelligent control switch. The lower pump inner chamber 16-1 is formed by the lower pump annulus 28, the lower pump plunger 22-5, and the through-pipe fixed valve 15.

[0058] 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.

[0059] 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.

[0060] 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 intelligent production system.

[0061] Example 2 The present invention also provides a method for the extraction of underground intelligent mining resources, implemented based on the underground intelligent mining resources as described in 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 collector 8, the cylinder of the second through-pipe packer, and the internal pressure chamber of the third intelligent control switch respectively; S2, the lower part of the first through-pipe packer is sequentially connected to the oil pipe short section, the collector 8, the through-pipe short section, the second intelligent control switch, the through-pipe short section, and the collector 8; the steel pipe cable passing through it is connected to the upper inlet cable of the second intelligent control switch, and the lower outlet cable of the second intelligent control switch is connected to the upper inlet cable from the third intelligent control switch; the thin steel pipe passing through the first through-pipe packer is connected to the collector 8, the oil cylinder of the first through-pipe packer, and the inner pressure chamber of the second intelligent control switch; the thin steel pipe passing through the second intelligent control switch is connected to the collector 8; 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 steel pipe cable passing through the first conduit packer to the outgoing cable of the first intelligent control switch, and connect the communication interface of the first intelligent control switch to the computer to test whether each switch is normal. S5, 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 oil layer locking point in the wellbore; S6, Formation Separation: Pressurize the tubing to 12MPa-15MPa, anchor the unloader and all the through-tube packers in sequence, 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, lower it into the upper and lower pumps, install the wellhead and pumping equipment, and start oil production.

[0062] In some embodiments, tiered metering is also included, which includes the following steps: F1: Set all 3 smart control switches to full open, produce for 3-5 days, drain the residual fluid from the well, and restore the well to its original production state. F2 activates any one of the first, second, and third smart control switches. Each activated smart control switch will produce oil independently for 3-5 days, and oil production data for the three layers will be obtained respectively. F3, based on the oil production data of the oil layer obtained in step F2, produces the oil layer corresponding to the first intelligent control switch, and at the same time produces the oil layer with the most oil production data among the oil layers corresponding to the second and third intelligent control switches, so as to achieve independent production of the two oil layers.

[0063] 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 downhole intelligent mining system, characterized in that, include: Several oil pipes are provided inside the casing. Each pair of adjacent oil pipes is connected by a smart switch. The smart switch is used to open and close the channel connecting the outside and inside of the oil pipe. The smart switch is equipped with an internal pressure gauge for detecting the pressure inside the oil pipe and an external pressure gauge for detecting the pressure outside the oil pipe. Several 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. Each independent cavity is equipped with a corresponding intelligent control switch. The intelligent control switches include 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 an intelligent valve body, an intelligent valve housing, and an upper end. The intelligent valve body, intelligent valve housing, and upper end are connected to form a closed internal pressure testing cavity and an annular cavity. The outer side of the intelligent valve body of the first, second, and third intelligent control switches is provided with an inlet... The valve comprises a liquid inlet and a fan-shaped flow channel, with an outlet hole on the inner side. Both the inlet and outlet holes communicate with the fan-shaped flow channel. The inlet and outlet holes communicate with the outer side and inner cavity of the intelligent valve body, respectively. A rotary switch is installed inside the inlet hole, and a screen tube is provided on the outer side of the inlet hole. The first, second, and third intelligent control switches each include a drive motor. Each rotary switch includes a valve core, a valve sleeve, and a connecting shaft. The drive motor is installed inside 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. A one-way valve is provided at the inlet end of the outlet hole; it also includes an upper pump and a lower pump, which are located at the upper and lower 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 one 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 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 inner cavity of the upper plunger, the inner cavity of the lower plunger, and the inner cavity of the pump upper oil pipe. The channel between them; 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. The pump lower pipe column also includes a collector and a thin steel pipe. The thin steel pipe includes several thin steel pipes. The several thin steel pipes are respectively used to connect the annular cavity of the pipe fixing valve with the inner cavity of the collector, connect the inner cavity of the collector with the liquid cylinder cavity of the second pipe packer, connect the inner cavity of the collector with the liquid cylinder cavity of the first pipe packer, and connect the inner pressure measuring cavity of the second intelligent control switch and the third intelligent control switch.

2. The downhole intelligent mining system according to claim 1, characterized in that, The internal pressure testing chamber of the intelligent control switch includes a liquid guiding hole, a pressure guiding hole, and a through-tube hole provided on the chamber; the liquid guiding hole is connected to a thermometer, the pressure guiding hole is connected to a pressure gauge inside the tube, and a thin steel tube is inserted into the through-tube hole and connected to the internal pressure testing chambers of multiple intelligent control switches.

3. The downhole intelligent mining system according to claim 1, characterized in that, The annular cavity of the intelligent control switch houses a drive motor, a pipe pressure gauge, a formation pressure gauge, and a thermometer, and is connected to the circuit board and power system wires; the annular cavity is provided with a power output port, a data communication port, and a cable through hole.

4. The downhole intelligent mining system according to claim 1, characterized in that, The first intelligent control switch is equipped with a first circuit board and a power supply system. The second and third intelligent control switches are each equipped with a second control circuit board and a power supply system. The first circuit board and power supply system and the second control circuit board and power supply system are connected to the corresponding drive motor wires. The first circuit board and power supply system and the second control circuit board and power supply system are connected through an upper inlet cable and a lower outlet cable.

5. The downhole intelligent mining system according to claim 1, characterized in that, The upper pump is a combination of a long pump barrel and a short plunger, and the lower pump is a combination of a short pump barrel, a lower pump housing, and a long plunger. The outer diameter of the upper plunger is larger than the outer diameter of the lower plunger, and the length of the lower plunger is greater than the length of the upper plunger.

6. The downhole intelligent mining system according to claim 1, characterized in that, It also includes a pipe fixing valve, 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.

7. A method for mining in an intelligent downhole mining system, characterized in that, The implementation of the downhole intelligent mining system based on any one of claims 1-6 includes the following steps: S1, the lower part of the second conduit 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 central collector is connected to the thin steel pipe between the second conduit packer and the third intelligent control switch; 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, and the central collector is connected to the thin steel pipe between the first conduit packer and the second intelligent switch; S3, after injecting mechanical oil into the thin steel pipe and passing the pressure test, connect it to the pipe fixing valve, and use the communication interface of the first intelligent control switch to connect to the computer to test whether each switch is normal; S4, the upper pump outer pipe is connected to the anchor unloader, the anchor unloader is connected to the oil pipe and moved down to the designed jamming point position; S5, pressurize from inside the tubing by 12MPa-15MPa, anchor the unloader and all the through-pipe packers in sequence, separating the outside of the tubing from the inside of the casing into several independent cavities; S6, connect the upper plunger with the sucker rod, lower it into the production pump, install the wellhead and pumping equipment, and start oil production.

8. The extraction method of the downhole intelligent extraction system according to claim 7, characterized in that, It also includes stratified metering, which includes the following steps: F1, set all three intelligent control switches to full open, and first drain the residual fluid from the well. F2 activates any one of the first, second, and third smart control switches. Each activated smart control switch will produce oil independently for 3-5 days, and oil production data for the three layers will be obtained separately. F3, based on the oil production data of the oil layer obtained in step F2, produces the oil layer corresponding to the first intelligent control switch, and at the same time produces the oil layer with the most oil production data 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.

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