Underground cable intelligent separate mining system and method

Abstract

The system comprises a plurality of oil pipes and a plurality of pipe penetrating packers, the oil pipes are arranged on the inner side of a casing pipe, every two adjacent oil pipes are connected through an intelligent control switch, and the size of an opening of each intelligent control switch can be adjusted so as to adjust the flow entering the inner side of the corresponding oil pipe from the outer side of the corresponding oil pipe; the pipe penetrating packers are used for dividing the space between the outer side of the oil pipe and the inner side of the sleeve into a plurality of independent cavities, and each intelligent control switch is located between the two corresponding pipe penetrating packers. The method is implemented based on the underground cable intelligent separate mining system. The device has the beneficial effects that the flow entering the inner side of the oil pipe from the outer side of the oil pipe of the corresponding oil layer is controlled through each intelligent control switch, so that the liquid inlet ratio of each oil production layer is optimized, the pressure of each oil layer is in a proper range, interlayer interference during mixed production is reduced, and the crude oil yield is improved.

Description

Technical Field

[0001] The present invention relates to the field of oil extraction, and particularly to a downhole cable-connected intelligent separate production system and method. Background Art

[0002] In the initial stage of oilfield exploitation, the main layer sections are independently exploited from bottom to top. After each main oil layer enters the medium and high water cut stage, whole-well combined layer mixing exploitation is implemented, and generally large pump liquid lifting means are used to increase the crude oil production of a single well. Due to the interlayer heterogeneity, the process stimulation effect is not ideal. At the same time, with long-term water injection development, the pressure imbalance of each oil layer is aggravated, and the interlayer interference in the longitudinal direction of the oil layer is increased. When mixing exploitation in the same well, the oil layer with high pressure inhibits the productivity of the oil layer with low pressure, affecting the crude oil production. The separate layer oil production process can solve the interlayer interference in the exploitation of heterogeneous oil reservoirs when the oil well enters the high water cut stage, give full play to the potential of each oil-bearing layer series, and can also further tap the reserves that have not been exploited in the original main oil layer, fully excavating the potential of remaining oil. Due to technical bottlenecks such as short life of separate layer metering, separate layer pressure measurement, and separate production systems, this technology has not been widely promoted and applied in oilfields.

[0003] With the breakthrough of cable-connected intelligent separate layer oil production technology in domestic oilfields, intelligent switching tools are adopted to solve the technical bottlenecks of separate layer metering and separate layer pressure measurement in oil wells. In the process string, a combination of a tubular pump, a rod pump, and an intelligent control switch is used, and by switching production layers of multiple downhole oil layers, the oil production of each layer can be known. However, problems such as interlayer interference when two layers are independently exploited simultaneously and when multiple layers are exploited simultaneously have not been effectively solved.

[0004] For the invention patent "Intelligent Separate Production String", application number CN201811121627.7, this invention adopts an integral cable-connected separate production tubing string, and the separate production switch is arranged under the sucker rod pump. The string features: the separate layer production string includes at least two separate layer control switches and at least two packers. Between two separate layer control switches, one packer is connected. Above the uppermost separate layer control switch, one packer is connected. All the separate layer control switches are electrically connected to form an integral structure through a parallel connection mode with a control cable. This invention realizes all processes with one trip of the string, and the single-layer water nozzle can be opened and closed in real time. The design drawings do not involve structures, measures, and process schemes for solving interlayer interference. Existing problems: two layers cannot be independently exploited simultaneously. When the two-layer switches are opened simultaneously, the liquid in the high-pressure layer will pour into the low-pressure oil layer.

[0005] Patent "A tubular pump cable separation and testing system", application number CN202121611539.2, the tubular pump cable separation and testing system includes: a bottom plug connected by an oil pipe from bottom to top, an intelligent separation device, a line seal, a pressure differential sleeve, an oil drain mechanism, a tubular pump, a sucker rod, a line and a wellhead sealing mechanism; the tubular pump cable separation and testing system realizes intelligent stratified mining with a single trip down the tubing string, with simple construction and stable structure, solving the technical difficulties of stratified metering and real-time uploading of stratified pressure tests; there are problems, the design drawings and instructions do not involve the switch structure principle, how to solve the inter-layer interference when the three intelligent separation devices are simultaneously filled with liquid, there are no preventive measures and process solutions, and the high-pressure layer liquid will be injected into the low-pressure oil layer; the three intelligent separation devices of the invention are all arranged on the tubing string under the tubular pump, which only realizes the production of three layers in turn, and does not realize the synchronous and independent mining of at least two layers, and the technical problem of inter-layer interference needs to be solved.

[0006] Invention patent 1 "A tubular pump oil well construction string and construction method", application number N202311453514.8, is characterized by including: a ground control system, a tubular pump, a differential pressure sleeve, a safety joint, multiple groups of packers and production distributors connected by oil pipes in order from top to bottom to form a tubular string; through the cooperation of the differential pressure sleeve and the tubular pump, two-way flow in the tubular string is achieved before triggering, and the function of the tubular pump's one-way valve is restored after triggering, thereby achieving the construction of the tubular pump oil well by going down the well once. This invention has better solved the problem that tubular pump oil wells can only produce fluid in one direction, and cannot realize the passage of ground injection fluid, the pressure sealing of the packer and the selective layer production; it does not involve the technical bottlenecks that need to be solved for the simultaneous independent production of at least two layers and the interference between layers when multiple layers are produced simultaneously. ‌‌ Summary of the Invention

[0007] The technical problem to be solved by the present invention is that the current multi-layer mixed production of oil will cause inter-layer interference, which affects the crude oil production. The purpose is to provide a downhole cable intelligent production system and method, which controls the flow from the outside of the oil pipe to the inside of the oil pipe of the corresponding oil layer through each intelligent control switch, thereby optimizing the liquid inlet ratio of each oil production layer, so that the pressure of each oil layer is within an appropriate range, reducing the inter-layer interference during mixed production, and increasing crude oil production.

[0008] The present invention is achieved through the following technical solutions: A downhole intelligent cable production system comprises several oil pipes and several through-the-tube packers, wherein the oil pipes are arranged on the inner side of the casing, and adjacent oil pipes are connected by intelligent control switches, and each intelligent control switch is used to open and close the channel connecting the outer side of the oil pipe and the inner side of the oil pipe. The opening size of the intelligent control switch is adjustable to adjust the flow rate from the outer side of the corresponding oil pipe to the inner side of the oil pipe; the through-the-tube packers are used to separate the space between the outer side of the oil pipe and the inner side of the casing into several independent cavities, and a corresponding intelligent control switch is provided in each independent cavity.

[0009] The beneficial effect of the present invention is that a through-the-tube seal is provided to separate the outer side of the oil pipe and the inner side of the casing into several independent cavities, so that each layer of oil is set in the corresponding cavity, and several intelligent control switches are provided to connect the two adjacent oil pipes through the intelligent control switches. The intelligent control switches are also used to control the channel for each layer of oil to enter the inner cavity of the oil pipe, and the flow rate from the outer side of the oil pipe to the inner side of the oil pipe of the corresponding oil layer is controlled, thereby optimizing the liquid inlet ratio of each oil production layer, making the pressure of each oil layer within an appropriate range, reducing the interference between layers during mixed production, and increasing crude oil production.

[0010] In some embodiments, the system further 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 which includes a control circuit board. The upper inlet cable is connected to the control circuit board of the first intelligent switch, and the control circuit boards of the first, second, and third intelligent switches are all connected via the lower outlet cable. The upper inlet and lower outlet cables ensure data transmission speed and signal quality, allowing smooth transmission of in-well information to a control terminal located on the surface. This facilitates the control terminal to obtain in-well information and control the corresponding intelligent switches to perform corresponding operations based on the in-well information. The integrated circuit board and power supply system of the first control switch are also connected to the control circuit boards and power supply systems of the second and third intelligent switches. This means that the three intelligent switches are equipped with a single microprocessor, control software, and storage components, enabling centralized control, test data sharing, and power supply sharing. The control software has preset operating modes for the three switches.

[0011] In some embodiments, the first, second, and third intelligent switches each include an intelligent valve body, an intelligent valve housing, and an upper end cap. These valve bodies, housings, and upper end caps are connected to form a closed annular cavity. This seals the intelligent switches as a single unit, preventing fluid from entering the switch and ensuring proper operation. This facilitates the transmission of hydraulic commands from within the oil pipe, preventing formation contamination from the construction medium, reducing downhole tool usage, and simplifying the tubing string structure.

[0012] In some embodiments, liquid inlet holes are provided on the outer sides of the first intelligent control switch, the second intelligent control switch, and the third intelligent control switch, and liquid outlet holes and fan-shaped flow channels are provided on the inner sides. The liquid inlet holes communicate with the fan-shaped flow channels, and the liquid outlet holes and the liquid inlet holes communicate with the outer side and the inner cavity of the oil pipe respectively. A rotary switch is installed in the liquid inlet hole, and a screen pipe is provided on the outer side of the inlet of the liquid inlet hole, and thin slits are provided on the screen pipe. By providing a fan-shaped flow channel to communicate the liquid inlet hole with the external liquid outlet hole and installing a rotary switch in the liquid inlet hole, it is convenient to control the oil liquid located outside the oil pipe to enter the inner side of the oil pipe through the rotary switch. During operation, when the rotary switch is opened, the oil liquid outside the oil pipe enters the fan-shaped flow channel from the liquid inlet hole, then enters the liquid outlet hole from the fan-shaped flow channel, and then enters the inner cavity of the oil pipe.

[0013] In some embodiments, the first intelligent control switch, the second intelligent control switch, and the third intelligent control switch each include a drive motor. The rotary switches each include a valve core, a valve sleeve, and a connecting shaft. The drive motor is installed in the annular cavity and above the liquid inlet hole. The output shaft of the drive motor is connected to the connecting shaft, the connecting shaft is connected to the valve core, and the valve core and the valve sleeve form a rotary switch. A check valve is provided at the inlet end of the liquid outlet hole, and the control circuit board and the power supply 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 liquid inlet hole, and a fixed valve dedicated to the oil production pump, i.e., a check valve, is configured at the rear end to withstand the high pressure difference environment and frequent actions of the pump, and its service life is maintained consistent with that of a conventional pump; since the rotary switch only operates during stratified metering and adjusting the production layer, its working frequency is extremely low, and as long as the anti-corrosion and anti-scaling problems on the surface of the switch are solved, the service life of the intelligent control switch can be improved.

[0014] In some embodiments, it further includes a surface cable, a wellhead control cabinet, a wireless transmitter, and a computer. The surface cable is connected to the upper cable, 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 the wireless transmitter is communicatively connected to the computer. It is convenient to collect well information through the control cabinet and send the well information to the computer through the wireless transmitter, and the computer controls the corresponding intelligent control switch to perform corresponding operations according to the well information.

[0015] In some embodiments, a lower pump and an upper pump are further included. The pump casings of the lower pump and the upper pump are respectively located at the upper end and the lower end of the first intelligent control. 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 whole. A traveling valve and an upper pump drain valve are arranged on the upper plunger, and a lower pump drain valve is arranged on the lower plunger. The upper pump drain valve is used to open and close the channel between the upper pump chamber and the inner cavity of the upper plunger. The lower pump drain 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 cavities of the upper plunger and the lower plunger. When the combined plunger formed integrally by the upper plunger and the lower plunger runs upward from the lower starting point, the traveling valve, the drain valve, and the lower pump drain valve are simultaneously closed. The liquid above the combined plunger is lifted out of the upper pump barrel and discharged out of the wellhead through the tubing. The pressures in the upper pump chamber and the inner cavity of the lower pump gradually increase, reducing the opening degree of the valve ball. The two layers of liquid respectively enter the upper and lower pump chambers. When the combined plunger reaches the upper starting point, the oil chamber is gradually filled with oil. When the sucker rod drives the combined plunger to run downward from the upper starting point, the upper pump chamber and the inner cavity of the lower pump gradually become smaller, and the pressure in the cavity increases. Then the drain valve and the lower pump drain valve are pushed open, and the oil in the two pump chambers is discharged to the upper part of the combined plunger through the traveling valve, completing a working cycle.

[0016] In some embodiments, inner pressure guiding holes and outer pressure guiding holes are provided on the first intelligent control switch, the second intelligent control switch, and the third intelligent control switch. The outer pressure guiding holes communicate with the outside of the tubing, and the inner pressure guiding holes communicate with the inner cavity of the tubing. A tubing outer pressure gauge is arranged on the outer pressure guiding hole, and a tubing inner pressure gauge is arranged on the inner pressure guiding hole. It is convenient to respectively obtain the pressure outside the tubing and the pressure in the inner cavity of the tubing of the corresponding oil layer through the tubing outer pressure gauge and the tubing inner pressure gauge.

[0017] In some embodiments, a centralizer and a thin steel pipe are further included. The thin steel pipe includes several thin steel pipes, which are used to connect the annular cavity of the pipe-through fixed valve with the inner cavity of the centralizer, to connect the inner cavity of the centralizer with the liquid cylinder cavities of the second pipe-through packer and the first pipe-through packer, and to connect the inner side pressure cavities of the second intelligent control switch and the third intelligent control switch. It is convenient to inject mechanical oil into the thin steel pipe for pressure testing during wellhead installation and inspection. After passing the pressure test, insert it into the annulus of the pipe-through fixed valve and lock and seal it with a sealing compression cap. Connect it to a computer through 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 respectively connected to the upper pump barrel and the outer pipe of the upper pump, and the lower end is respectively connected to the lower pump barrel and the outer pipe of the lower pump. The inner cavity of the connecting pipe in the annular cavity of the first intelligent control switch communicates with the annulus of the upper pump and the annulus of the lower pump.

[0019] In some embodiments, it further includes a pipe-passing fixed valve. The lower end of the pipe-passing fixed valve is connected to the lower pipe string of the pump, and the upper end is respectively connected to the lower pump housing and the outer pipe of the lower pump. The pipe-passing fixed valve is used to open and close the channel between the inner cavity of the lower pipe string of the pump and the lower pump chamber.

[0020] The present invention also provides an intelligent cable-downhole separate production method, which is implemented based on the intelligent cable-downhole separate production system described in any one of claims 1-10, and includes the following steps: S1. A middle collector, a third intelligent control switch, a tubing, and a plug are sequentially connected to the lower part of the second pipe-passing packer; it includes the connection of the middle collector through a thin steel pipe below, and the connection of the thin steel pipe between the middle collector and the second pipe-passing packer; S2. A middle collector and a second intelligent control switch are sequentially connected to the lower part of the first pipe-passing packer; it includes the connection of the middle collector through a thin steel pipe below, and the connection of the thin steel pipe between the middle collector and the first pipe-passing packer; S3. Wellhead installation inspection: After injecting mechanical oil into the thin steel pipe for pressure testing and passing, it is connected to the pipe-passing fixed valve, and is connected to the upward cable of the first intelligent control switch to test whether each switch is normal until the wellhead; S4. Lowering the separate production string into the well: The outer pipe of the upper pump is connected to the anchor unloading oil device, and the anchor unloading oil device is connected to the tubing and moved down to the designed setting point position; S5. Separating the formation: Pressurize from the tubing, and sequentially set the cable-passing anchor unloading oil device and all pipe-passing packers, and separate the outside of the tubing from the inside of the casing into several independent cavities; S6. Lowering the plunger of the separate production pump and opening the well: Connect the upper plunger with a sucker rod, lower it into the separate production pump, install the wellhead and the pumping equipment, and start pumping production.

[0021] S7. By controlling the opening or closing of the corresponding intelligent control switch, perform stratified metering on each oil layer; The stratified metering includes the following steps: S71. Set the 3 intelligent control switches to fully open and produce for 3 to 5 days; Drain the residual liquid in the well during the operation, and restore the original production state of the well; S72. Open any one of the first intelligent control switch, the second intelligent control switch, and the third intelligent control switch. Each time an intelligent control switch is opened, produce independently for 3 to 5 days to obtain the oil production data of 3 intervals respectively; S73. According to the oil production data of the oil layers obtained in step S7, 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 intelligent control switch and the third intelligent control switch to achieve independent production of the two oil layers. It solves the problem of interlayer interference in the simultaneous exploitation of two oil layers in the prior art, and at the same time improves the development efficiency of the oil well and increases the oil well production.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. It solves the problem of interlayer interference during the mixed exploitation of multiple oil layers in the same well, and at the same time increases the oil production per well and improves the overall development efficiency of the oilfield.

[0023] 2. It adopts the structure of a double-tube intelligent control separate production pump, overcomes the phenomenon that the bearing of a small-diameter pump is prone to bending under axial load, enhances the ability to adapt to different well conditions, and solves the hydraulic transmission channel through the pump.

[0024] 3. The thin steel pipe separated from the centralizer in the pipe string below the pump connects the hydraulic cylinder chambers of multiple packers, improves the ability of the packer to withstand bidirectional pressure differences, reduces the usage of downhole tools, and simplifies the pipe string structure.

[0025] 4. A rotary switch with small driving resistance and simple structure is set at the front end of the liquid inlet channel, and a fixed valve, namely a check valve, with a special structure for an oil production pump is configured at the rear end to withstand the high-pressure difference environment and frequent actions of the pump. Its service life is kept consistent with that of a conventional pump; since the rotary switch only operates during stratified metering and adjusting production layers, its operating frequency is extremely low. As long as the anti-corrosion and anti-scaling problems on the switch surface are solved, the service life of the intelligent control switch can be further improved.

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

[0027] 6. A filter screen pipe is added at the front end of the liquid inlet of the first intelligent control switch of the present invention to prevent mechanical slag from entering the liquid inlet channel of the switch, clean the flowing medium, further improve the working environment of its two moving parts, and further improve the service life of the intelligent control switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings: Figure 1 is the central cross-sectional view of the present invention; Figure 2 is the partial structure diagram of the present invention; Figure 3 is the partial structure diagram of the present invention; Figure 4 is the present invention Figure 1 the cross-sectional view of D-D in; Figure 5 is the present invention Figure 1 the cross-sectional view of D1-D1 in; Figure 6 is the present inventionFigure 4 Cross-sectional view along B-B; Figure 7 For the present invention Figure 4 Cross-sectional view along C-C.

[0029] Markings in the attached drawings of the specification and corresponding names of components: Third intelligent control switch 6, second intelligent control switch 13, lower pump housing 16, connecting pipe 11, second pipe string packer 9, first pipe string packer 14, pipe string fixed valve 15, lower pump outer pipe 17, lower pump barrel 18, lower pump annulus 28, upper pump annulus 27, sucker rod 25, cable through anchor unloading device 24, combined plunger 22, upper pump outer pipe 21, upper pump barrel 20, tubing 26, centralizer joint 23, first intelligent control switch 19, valve sleeve 6-3, coupling shaft 6-4, drive motor 6-5, housing 6-6, in-pipe pressure gauge 6-7, upper end head 6-8, out-of-pipe pressure gauge 6-9, sector flow channel 6-10, internal pressure measurement cavity 6-11, thermometer 6-12, circuit board and power supply system 6-13, external pressure guiding hole 6-17, check valve 6-16, intelligent valve main body 19-1, intelligent valve housing 19-2, internal pressure guiding hole 19-3, connecting pipe 19-4, internal communication hole 19-5, traveling valve 22-1, upper pump plunger 22-2, upper pump liquid discharge valve 22-3, parallel channel 22-4, lower pump plunger 22-5, upper pump chamber 22-6, lower cable 29, lower pump liquid discharge valve 22-7, liquid outlet hole 6-21, liquid inlet hole 6-22, liquid guiding hole 6-23, annular cavity 15-1, valve ball 15-2, lower pump inner cavity 16-1, liquid cylinder cavity 14-1, liquid cylinder cavity 9-1, casing 2, tubing nipple 4, tubing plug 3, screen pipe 5, first intelligent control switch 6-1, valve core 6-2, sector flow channel 19-6, cable outlet 19-7, external pressure guiding 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 cable 30, surface cable 31, wellhead control cabinet 32, wireless transmitter 33, computer 34, centralizer 8, first pipe string packer 14, second pipe string packer 9. Detailed implementation manners

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

[0031] Throughout the specification, references to "an embodiment", "embodiments", "an example", or "examples" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Thus, the phrases "an embodiment", "embodiments", "an example", or "examples" that appear throughout the specification do not necessarily all refer to the same embodiment or example. In addition, the specific features, structures, or characteristics may be combined in any suitable combination and / or sub-combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the diagrams provided herein are for illustrative purposes only and are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] In the description of the present invention, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention.

[0033] The terms "first", "second", etc. used in the present invention are only used to distinguish the corresponding components for the sake of clear description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connected" used herein, without special explanation, may be directly connected or indirectly connected through other components.

[0034] Embodiment 1 A downhole cable-connected intelligent separate production system, see Figures 1 - 7 , mainly including: tubing and tubing nipples, an anchor unloading oil device 24, an upper pump, a first intelligent control switch, a lower pump, a combined plunger, a screen pipe, a through fixed valve, a thin steel pipe, a middle collector, second and third intelligent control switches, and first and second pipe string packers; several tubing 26 and tubing nipples are used to connect the above components to form Figure 1 as shown; the downhole cable-connected intelligent separate production system is arranged inside the casing 2, and each intelligent control switch is used to open and close the channel communicating the outside of the tubing 26 with the inside of the tubing 26, and the opening size of the intelligent control switch can be adjusted to adjust the flow rate from the outside of the tubing 26 into the inside of the tubing 26. The pipe string packer is used to separate the outside of the tubing 26 from the inside of the casing 2 into several independent cavities, and each independent cavity is provided with a corresponding intelligent control switch.

[0035] Specifically, through holes are provided at the positions of the casing 2 corresponding to the oil layers, so that the oil liquids of each oil layer enter the outside of the corresponding tubing. See Figure 1, the downhole cable-connected intelligent separate production string is lowered into the oil well; the clamping positions of the first and second pipe-piercing packers are set in the interlayers between oil layers 1, 2 and oil layers 2, 3, separating the space between the outer side of the tubing and the inner side of the casing into 3 independent cavities, and each of the 3 intelligent control switches is correspondingly connected to an independent cavity; the thin steel pipe and the middle collector hydraulically transmit the liquid in the annulus between the upper pump, the first intelligent control switch and the lower pump into the hydraulic cylinders of the first and second pipe-piercing packers; the adjustment instructions on the ground are transmitted to the 3 intelligent control switches through the cable, and the opening size of the intelligent control switches can be adjusted; the upper pump and the lower pump respectively correspond to their respective oil layers to achieve two-layer independent production. N pipe-piercing packers can be set on the cable-connected intelligent separate production string to separate the outer side of the tubing and the inner side of the casing into N + 1 independent cavities, each independent cavity corresponds to an oil layer and an intelligent control switch, and the intelligent control switch controls the oil liquid of each layer to enter the inner cavity of the tubing and the cavities of the upper pump and the lower pump; the external pipe pressure gauges set on each intelligent control switch are used to monitor the formation pressure changes, and then obtain the flowing pressure and the oil layer pressure recovery situation of each oil layer; by sequentially operating the switches to collect the produced liquid of each oil layer, that is, layer-by-layer metering, the oil production of each production layer of the oil well can be obtained, and then, from oil layers 2, 3, 4, etc., preferably one layer can be independently produced simultaneously with oil layer 1, completely solving the interlayer contradiction problem in commingled production in the same well, enabling the well to obtain the best oil production, and improving the oil recovery efficiency of the oil well; the internal pipe pressure gauge can be used to monitor the pressure change in the pump cavity.

[0036] See Figure 1 , the upper pump of the downhole cable-connected intelligent separate production system includes an upper pump outer pipe 21, a centralizer joint 23, an upper pump barrel 20, a first intelligent control switch 19 and a screen pipe 5, and the lower pump includes a lower pump barrel 18, a lower pump housing 16, a lower pump outer pipe 17, a pipe-piercing fixed valve 15, and a combined plunger 22 with the upper pump plunger and the lower pump plunger connected as a whole, etc.; the upper outer port of the intelligent valve housing 19-2 of the first intelligent control switch is threadedly connected to the pump outer pipe 21, and the inner port is threadedly and hermetically connected to the upper pump barrel 20. The outer circle of the upper pump barrel 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 1 switch is threadedly connected to the screen pipe 5, the lower inner small hole is hermetically connected to the upper outer end of the lower pump barrel 18, the lower large inner hole is hermetically and threadedly connected to the lower pump outer pipe 17, the lower pump outer pipe 17 is hermetically threadedly connected to the upper end of the pipe-piercing fixed valve 15, the lower end of the lower pump barrel 18 is hermetically threadedly connected to the upper end of the lower pump housing 16, and the lower end of the lower pump housing 16 is hermetically threadedly connected to the upper inner end of the pipe-piercing fixed 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 penetrated by the communication pipe 19-4 of the first intelligent control switch 19 and are simultaneously connected to the annulus 15-1 of the pipe-piercing fixed valve 15 to form a hydraulic channel through the pump; the pipe-piercing fixed valve 15 is provided with a connection port for hydraulic downward transmission.

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

[0038] See Figure 1 , the pipe-through packer includes a second pipe-through packer 9 and a first pipe-through packer 14. The second pipe-through packer 9 and the first pipe-through packer 14 are respectively used to separate the oil layers 3, 2, and 1 from bottom to top by the oil pipe. At least two pipe-through channels are provided on the pipe-through packer. One is for passing a thin steel pipe, and the other is for passing a steel pipe cable. The channel holes at both ends are locked and sealed with a sealing compression cap 10 between the steel pipes; the pipe-through channels can be in two ways: from the packer steel body and borrowing the central hole. The structure given in the present invention is passing through the packer steel body.

[0039] See Figure 1 , the upper outer port of the intelligent valve housing 19-2 of the first intelligent control switch is threadedly connected to the outer pump pipe 21, and the inner port is threadedly and sealedly connected to the upper pump barrel 20. The outer circle of the upper pump barrel 20 and the inner hole of the outer pump pipe 21 form an upper pump annulus 27. The upper pump barrel 20 stands upright inside the upper outer pump pipe 21, and the centralizing joint 23 at the upper end of the upper pump barrel 20 is in clearance contact with the inner wall of the upper outer pump pipe 21; the lower outer port of the intelligent valve housing 19-1 of the first intelligent control switch is threadedly connected to the screen pipe 5, the lower inner small hole is sealedly connected to the upper outer end of the lower pump barrel 18, the lower large inner hole is threadedly sealedly connected to the lower outer pump pipe 17, the lower outer pump pipe 17 is threadedly and sealedly connected to the upper end of the pipe-through fixed valve 15, the lower end of the lower pump barrel 18 is threadedly and sealedly connected to the upper end of the lower pump housing 16, and the lower end of the lower pump housing 16 is sealedly connected to the upper inner end of the pipe-through fixed valve 15; the lower pump barrel 18, the lower pump housing 16 and the lower outer pump pipe 17 form a lower pump annulus 28; the upper pump annulus 27 and the lower pump annulus 28 are penetrated by the communication pipe 19-4 of the first intelligent control switch 19 and are simultaneously connected to the annulus 15-1 of the pipe-through fixed valve 15 to form a hydraulic channel passing through the pump; the pipe-through fixed valve 15 is provided with a connection port for hydraulic downward transmission.

[0040] See Figure 1 and Figure 2 , it further includes an upper incoming cable 30 and a lower outgoing 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 a circuit board. The upper incoming cable 30 is connected to the circuit board 19-11 of the first intelligent control switch 19, and 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 outgoing cable 29.

[0041] See Figure 1and Figure 2 , further comprising 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 upward 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 the wireless transmitter 33 can send information to the remote computer 34. The downward output cable 29 extends along the length direction of the oil pipe and is arranged vertically along the side wall of the oil pipe. The upward cable 30 and the downward output cable 29 connect the circuit boards of multiple intelligent switches into one body, and control actions can be sent from the wellhead control cabinet or the remote computer. Several intelligent control switches can act 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. The first intelligent control switch 19, the second intelligent control switch 13 and the third intelligent control switch 6 all include an intelligent valve body 19-1, an intelligent valve housing 19-2 and an upper end head 6-8. The intelligent valve body 19-1, the intelligent valve housing 19-2 and the upper end head 6-8 are connected to form a closed annular cavity. The built-in control circuit and power supply system are electrically connected to the drive motor 6-5 and are located in the annular cavity. Each built-in control circuit and power supply system is connected through the downward output cable 29. The annular cavity of each intelligent control switch is sealed as a whole to prevent oil from entering the inner side of the annular cavity and ensure the normal operation of the intelligent control switch.

[0043] See Figures 1 - 3 , on the outer sides of the first intelligent control switch 19, the second intelligent control switch 13 and the third intelligent control switch 6, liquid inlet holes (6-22, 19-10) are provided, and on the inner sides, liquid outlet holes (6-21, 19-9) and fan-shaped flow channels (6-10, 19-6) are provided. The liquid inlet holes (6-22, 19-10) and the liquid outlet holes (6-21, 19-9) are in series communication with the fan-shaped flow channels (6-10, 19-6). The liquid inlet holes (6-22, 19-10) and the liquid outlet holes (6-21, 19-9) are respectively communicated with the outer side and the inner cavity of the oil pipe. A rotary switch is installed in the liquid inlet holes (6-22, 19-10), and a screen pipe 5 is provided on the outer side of the inlet of the liquid inlet holes (6-22, 19-10); a rotary switch is installed in the liquid inlet holes (6-22, 19-10) to facilitate controlling the oil outside the oil pipe to enter the inner side of the oil pipe through the rotary switch. When the rotary switch is opened, the oil outside the oil pipe enters the fan-shaped flow channels (6-10, 19-6) from the liquid inlet holes (6-22, 19-10), then enters the liquid outlet holes (6-22, 19-10) from the fan-shaped flow channels (6-10, 19-6), and then enters the inner cavity of the oil pipe. When the rotary switch is closed, the oil flow stops.

[0044] See Figures 1 to 3 In the annular cavities of the first intelligent control switch 19, the second intelligent control switch 13 and the third intelligent control switch 6, there are liquid guide holes 6-23, upper end heads 6-8 and thermometers 6-12. The upper end head 6-8 is connected to the inner side of the intelligent valve housing 19-2 and is 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 in the upper end head 6-8. The thermometer 6-12 is arranged on the liquid guide hole 6-23. Thus, the temperature of the inner cavity of the oil pipe 26 corresponding to each intelligent control switch can be obtained.

[0045] See Figures 1 to 7 On the first intelligent control switch 19, the second intelligent control switch 13 and the third intelligent control switch 6, there are inner pressure guide holes 19-3 and outer pressure guide holes 6-17. The outer pressure guide hole 6-17 communicates with the outside of the oil pipe, the inner pressure guide hole 19-3 communicates with the inner cavity of the oil pipe. A pipe external pressure gauge 6-9 is arranged on the outer pressure guide hole 6-17, and a pipe internal pressure gauge 6-7 is arranged on the inner pressure guide hole 19-3. It is convenient to obtain the pressure outside the oil pipe of the corresponding oil layer and the pressure inside the oil pipe through the pipe external pressure gauge 6-9 and the pipe internal pressure gauge 19-3 respectively. A pump cavity pressure guide hole can be additionally arranged on the first intelligent control switch 19, and a pump cavity pressure gauge is arranged on the pump cavity pressure guide 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 coupling shaft 6-4. The drive motor 6-5 is installed in the annular cavity and is located above the liquid inlet holes (6-22, 19-10). The output shaft of the drive motor 6-5 is connected to the coupling shaft 6-4, the coupling shaft 6-4 is connected to the valve core 6-2, and a check valve is arranged at the inlet end of the liquid outlet holes (6-21, 19-9). A rotary switch with small driving resistance and simple structure is arranged at the rear end of the liquid inlet holes (6-22, 19-10), and a fixed valve with a special structure for an oil production pump, that is, a valve seat 6-16 and a valve ball 6-15 are sequentially placed in a round hole and locked and sealed with a valve cover 6-14, is configured at the front end of the liquid outlet holes (6-21, 19-9) to withstand the high pressure difference environment and frequent actions of the pump, and its service life is kept consistent with that of a conventional pump; since the rotary switch only acts during stratified metering and adjusting production layers, its working frequency is extremely low, as long as the anti-corrosion and anti-scaling problems on the switch surface are solved, thus improving the service life of the intelligent control switch.

[0047] See Figures 1 to 7The first, second, and third intelligent switches 19, 13, and 6 all have liquid inlet holes 6-22 located on the lower exterior of the intelligent valve bodies. Screen tubes 5 are located outside the entrances of these inlet holes 6-22. Adding filter screens 5 to the front of the intelligent switch inlets prevents machine debris from entering the switch flow channels, cleansing the fluid flow and further improving the working environment of the two operating components, thereby extending the lifespan of the intelligent switches.

[0048] See also Figures 1 to 7 , also includes a lower pump and an upper pump, the pump casings of the lower pump and the upper pump are respectively located at the lower end and the upper end of the first intelligent control, the lower pump includes a lower plunger, the upper pump includes an upper plunger, the upper plunger and the lower plunger are connected as one to form a combined plunger 22, a floating valve 22-1 and an upper pump discharge valve 22-3 are provided in the upper plunger, a lower pump discharge valve 22-7 is provided in the lower plunger, the upper pump discharge valve 22-3 is used to open and close the channel between the upper pump chamber 22-6 and the upper plunger inner cavity, the lower pump discharge valve 22-7 is used to open and close the channel between the lower pump chamber and the lower plunger inner cavity, the floating valve 22-1 is used to open and close the common channel for the combined oil of the upper plunger inner cavity and the lower plunger inner cavity to enter the inner cavity of the upper pump barrel 20. When the combined plunger 22 formed of an upper plunger and a lower plunger moves upward from the lower starting point, the traveling valve 22-1, the discharge valve and the lower pump discharge valve 22-7 are closed at the same time, and the liquid above the combined plunger 22 is lifted out of the upper pump barrel 20 and discharged to 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, the pressure is reduced, and the valve ball 15-2 opens, and the liquid of 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, the pressure in the chamber increases, and then the upper pump discharge valve 22-3 and the lower pump discharge valve 22-7 are pushed open, 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, completing one working cycle.

[0049] See also Figures 1 to 7 The upper plunger has a larger outer diameter than the lower plunger. A parallel channel 22-4 is provided axially along the upper pump discharge valve 22-3. Two sets of lower pump discharge valves 22-7 are housed within the lower pump plunger. The lower plunger is over 3.8 times the length of the upper plunger. The two pumps are matched in a structure with the larger pump on top and the smaller pump on the bottom. This facilitates the lowering of the combined plunger 22 from the wellhead, reduces downward resistance, and improves its ability to adapt to complex well conditions.

[0050] See also Figures 1 to 7, further comprising a pipe-passing fixed valve 15, the lower end of the pipe-passing fixed valve 15 is connected to the oil pipe 26, and the upper end is respectively connected to the lower pump housing 16 and the lower pump outer pipe 17. The pipe-passing fixed 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 and hermetically connected to the upper end of the pipe-passing fixed valve 15, the lower end of the lower pump barrel 18 is threadedly and hermetically connected to the upper end of the lower pump housing 16, the lower end of the lower pump housing 16 is threadedly and hermetically connected to the inner upper end of the pipe-passing fixed valve 15. After a thin steel pipe 11 is inserted into the connection port of the annular cavity 15-1 of the pipe-passing fixed valve 15 and locked and hermetically connected, the hydraulic pressure above the pump can be introduced below the pump.

[0051] See Figures 1 to 7 , further comprising a centralizer 8, a pipe-passing short joint 12, a sealing gland 10, several thin steel pipes 11, etc. One end of the thin steel pipe 11 communicates with the annular cavity 15-1 of the pipe-passing fixed valve 15, and the other end communicates with the inner cavity of the centralizer 8. The thin steel pipe 11 led out from the lower end of the centralizer 8 is respectively connected to the hydraulic cylinder cavities 9-1 and 14-1 of the second pipe-passing packer 9 and the first pipe-passing packer 14. The thin steel pipe 11 is inserted into the pipe-passing holes of each cavity and locked and sealed with the sealing gland 10. Before the thin steel pipe 11 communicates with the annular cavity 15-1 of the pipe-passing fixed valve 15, mechanical oil can be injected into the thin steel pipe 11. After being qualified by pressure test, it is inserted into the annular cavity 15-1 of the pipe-passing fixed valve 15 and locked and sealed with the sealing gland 10. [[ID=~]]

[0052] See Figures 1 - 7 , a pipe-in pressure gauge, a formation pressure gauge and a thermometer are installed in the body of the intelligent control switch. A pump cavity pressure gauge can be additionally installed in the first intelligent control switch; pressure guiding holes and liquid guiding holes leading to the target test are arranged in the switch body, realizing the measurement of pressure and temperature parameters inside and outside the pump cavity and the oil pipe corresponding to each intelligent control switch. It includes an intelligent control main body 6-1. An external pipe pressure gauge 6-9 is installed on the intelligent control main body 6-1 and connected to the external pressure guiding hole 6-17. A pipe-in pressure gauge 6-7 installed on the upper end head 6-8 is connected to the pressure guiding hole 6-11, and a thermometer 6-12 is connected to the liquid guiding hole 6-23.

[0053] See Figures 1 - 7 , the upper pump annulus 27 and the lower pump annulus 28 are penetrated by the communicating pipe 19-4 of the first intelligent control switch 19 and are integrally connected with the annulus 15-1 of the pipe-passing fixed valve 15 at the same time. The upper small inner hole of the intelligent valve housing 19-2 is hermetically and threadedly connected to the upper pump barrel 20, and the upper large inner (or outer) hole is hermetically and threadedly connected to the upper pump outer pipe 21. The outer cylindrical surface of the upper pump barrel 20 and the inner cylindrical surface of the upper pump outer pipe 21 form the upper pump annulus 27. The upper pump barrel 20 stands upright inside the upper pump outer pipe 21. The centralizing joint 23 at the upper end of the upper pump barrel 20 is in clearance contact with the inner wall of the upper pump outer pipe 21. The lower outer port of the intelligent valve main body 19-1 is threadedly connected to the screen pipe 5. The outer cylinder of the lower pump plunger 22-5 at the lower part of the combined plunger 22 and the inner hole of the upper pump barrel 20 form the upper pump cavity 22-6.

[0054] In this embodiment, the upper pump and the lower pump can be disassembled into two single-pump intelligent separate production systems. The upper-pump intelligent separate production system includes: an upper-pump outer pipe 21, a centralizer joint 23, an upper-pump barrel 20, an upper-pump plunger, a pipe-piercing fixed valve 15, etc.; the upper-pump outer pipe 21 is in sealed threaded connection with the upper end of the pipe-piercing fixed valve 15, and the lower end of the upper-pump barrel 20 is in sealed threaded connection with the inner upper end of the pipe-piercing fixed valve 15; the lower part of the pipe-piercing fixed valve 15 is connected to the second intelligent control switch, the second pipe-piercing packer, and the third intelligent control switch of the present invention.

[0055] Similarly, the lower-pump intelligent separate production system includes: a lower-pump outer pipe 17, a centralizer joint 23, a lower-pump barrel 18, a lower-pump housing 16, a lower-pump outer pipe 17, a lower-pump plunger, a pipe-piercing fixed valve 15, etc.; the lower-pump outer pipe 17 is in sealed threaded connection with the upper end of the pipe-piercing fixed valve 15, the lower end of the lower-pump barrel 18 is in sealed threaded connection with the upper end of the lower-pump housing 16, and the lower end of the lower-pump housing 16 is in sealed threaded connection with the inner upper end of the pipe-piercing fixed valve 15; the lower part of the pipe-piercing fixed valve 15 is connected to the second intelligent control switch, the second pipe-piercing packer, and the third intelligent control switch of the present invention.

[0056] In this embodiment, the outer pipe of the tubing pump can also be replaced with the outer working barrel of the rod pump. The outer working barrel is in sealed threaded connection with the upper end of the pipe-piercing fixed valve 15; the lower locking sleeve of the rod pump is in sealed threaded connection with the inner upper end of the pipe-piercing fixed valve 15; the rod pump is connected and lowered by a sucker rod, and the locking head at the lower end of the rod pump is matched with the locking sleeve for sealing, thus forming an intelligent separate production system with cable downhole.

[0057] Embodiment 2 The present invention also provides an intelligent separate production method with cable downhole, which is implemented based on the intelligent separate production system with cable downhole according to any one of claims 1-10, and includes the following steps: S1. The lower part of the second pipe-piercing packer is successively connected with a tubing nipple, a centralizer 8, a tubing nipple, a third intelligent control switch, a tubing and a plug, etc., and is lowered into the well (inside the casing); the downward-piercing steel pipe cable is connected to the upward cable of the third intelligent control switch, and the downward-piercing thin steel pipes are respectively connected to the centralizer 8 and the cylinder of the second pipe-piercing packer; S2. The lower part of the first pipe-piercing packer is successively connected with a tubing nipple, a centralizer 8, a pipe-piercing short joint, a second intelligent control switch, a pipe-piercing short joint, and a centralizer 8; the downward-piercing steel pipe cable is connected to the upward cable of the second intelligent control switch, and the downward cable of the second intelligent control switch is connected to the upward cable of the third intelligent control switch; the downward-piercing thin steel pipes are connected to the centralizer 8 and the cylinder of the first pipe-piercing packer; S3. Hydraulic manifold pressure test: Inject mechanical oil into the downward-piercing thin steel pipe of the first pipe-piercing packer, and after passing the pressure test, connect it to the pipe-piercing fixed valve; S4, communication test, using the first intelligent control switch up cable connected to the computer to test whether each switch is normal, every 10 to 15 oil pipes to communicate once until the wellhead; S5, the production string is lowered into the well: the upper pump outer tube 21 is connected to the cable anchored oil unloader 24, which is then connected to the oil pipe and moved down to the designed oil layer stuck point in the wellbore; S6, separation of formations: pressurize the tubing to 12MPa-15MPa, and set the cable anchor unloader 24 and all through-the-tube packers in sequence to separate the tubing outside and the casing inside into several independent cavities; S7, lowering the combined 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, hierarchical metering is further included, and the hierarchical metering includes the following steps: F1: Set the three intelligent control switches to fully open and produce for 3-5 days; drain the residual fluid entering the well and restore the well to its original production state; F2: Turn on any one of the first intelligent control switch 19, the second intelligent control switch 13, and the third intelligent control switch 6. Each intelligent control switch is turned on for independent production for 3-5 days to obtain oil production data for the three intervals respectively; F3, according to the oil layer production data 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 layers corresponding to the third intelligent control switch 6, so as to realize independent production of the two layers of oil.

[0059] It is convenient to control and open any intelligent control switch when performing stratified metering to obtain corresponding oil production data. Then, during production, the intelligent control switch closest to the ground and the intelligent control switch with the highest oil production among the remaining intelligent control switches can be turned on to realize simultaneous exploitation of two layers of oil, solving the problem of inter-layer interference in the simultaneous exploitation of two oil layers, and at the same time improving the efficiency of oil well development and increasing oil well production.

[0060] It also includes: installation inspection: the thin steel pipe 11 is injected with mechanical oil and the pressure test is passed, and then it is inserted into the annulus 15-1 of the pipe-through fixed valve 15, and the sealing cap 10 is used to lock the seal, and the communication test is passed; the sub-production pipe string is put into the well: the outer pipe of the upper pump is connected to the cable anchor oil unloader 24, and the cable anchor oil unloader 24 is connected to the oil pipe 26 and lowered, and the upper feed cable 30 is fixed on the outside of the oil pipe. Communication is carried out every 10 to 15 oil pipes until the designed position; separation of formations: pressurize 12 to 15 MPa from the oil pipe, and the cable anchor oil unloader 24, the multi-channel first pipe-through packer 14 and the second pipe-through packer 9 are sealed in turn, and the oil pipe is hung; lowering the sub-production pump plunger and opening the well: use the sucker rod 25 to connect the combined plunger 22 and lower it into the well, touch the pump, prevent the impact distance, install the wellhead and pumping equipment, and start oil production.

[0061] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent cable-downhole separate production system, characterized in that, Including: Several tubing strings, which are arranged inside the casing. Adjacent tubing strings are connected by intelligent control switches, and the opening size of the intelligent control switches can be adjusted to regulate the flow rate from the outside of the corresponding tubing string into the inside of the tubing string. Several pipe-through packers, which are used to divide the space between the outside of the tubing string and the inside of the casing into several independent cavities, and each independent cavity is provided with a corresponding intelligent control switch.

2. The downhole cable-connected intelligent separate production system according to claim 1, wherein It also includes an upward cable and a downward cable. The intelligent control switches include a first intelligent control switch, a second intelligent control switch, and a third intelligent control switch. The first intelligent control switch, the second intelligent control switch, and the third intelligent control switch all include a circuit board. The upward cable is connected to the circuit board of the first intelligent control switch, and the circuit boards of the first intelligent control switch, the second intelligent control switch, and the third intelligent control switch are all connected through the downward cable.

3. The downhole cable-connected intelligent separate production system according to claim 2, wherein The first intelligent control switch, the second intelligent control switch, and the third intelligent control switch all include an intelligent valve body, an intelligent valve housing, and an upper end head. The intelligent valve body, the intelligent valve housing, and the upper end head are connected to form a closed annular cavity.

4. The downhole cable-connected intelligent separate production system according to claim 3, wherein, On the outer side of the intelligent valve body of the first intelligent control switch, the second intelligent control switch, and the third intelligent control switch, there are liquid inlet holes and fan-shaped flow channels. On the inner side, there are liquid outlet holes. The liquid inlet holes and the liquid outlet holes are both communicated with the fan-shaped flow channels. The liquid outlet holes and the liquid inlet holes are respectively communicated with the outer side and the inner cavity of the intelligent valve body. A rotary switch is installed in the liquid inlet hole, and a screen pipe is arranged on the outer side of the inlet of the liquid inlet hole.

5. The downhole cable-connected intelligent separate production system according to claim 4, characterized in that The first intelligent control switch, the second intelligent control switch, and the third intelligent control switch all include a driving motor. The rotary switches all include a valve core, a valve sleeve, and a connecting shaft. The driving motor is installed in the annular cavity and above the liquid inlet hole. The output shaft of the driving motor is connected to the connecting shaft, the connecting shaft is connected to the valve core, a check valve is arranged at the inlet end of the liquid outlet hole, and the circuit board and the power supply system are electrically connected to the corresponding driving motor.

6. The downhole wired intelligent separate production system according to claim 2, wherein, It also includes a surface cable, a wellhead control cabinet, a wireless transmitter, and a computer. The surface cable is connected to the upward cable, 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 the wireless transmitter is communicatively connected to the computer.

7. The downhole cable-connected intelligent separate production system according to claims 1-6, characterized in that, It also includes a downhole pump and an uphole pump. The pump casings of the downhole pump and the uphole pump are respectively located at the lower end and the upper end of the first intelligent control switch. The downhole pump includes a lower plunger, the uphole pump includes an upper plunger, the upper plunger and the lower plunger are connected as a whole. A traveling valve and an uphole pump discharge valve are arranged in the upper plunger, a downhole pump discharge valve is arranged in the lower plunger. The uphole pump discharge valve is used to open and close the channel between the uphole pump chamber and the inner cavity of the upper plunger, the downhole pump discharge valve is used to open and close the channel between the downhole pump chamber and the inner cavity of the lower plunger, and the traveling valve is used to open and close the channels among the inner cavity of the upper plunger, the inner cavity of the lower plunger, and the inner cavity of the pump tubing string above.

8. The intelligent cable-connected downhole separate production system according to any one of claims 2-7, characterized in that, The first intelligent control switch, the second intelligent control switch, and the third intelligent control switch are all 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. A pipe outer pressure gauge is arranged on the outer pressure guiding hole, and a pipe inner pressure gauge is arranged on the inner pressure guiding hole.

9. The intelligent cable-downhole separate production system according to claim 7, wherein The upper end of the first intelligent control switch is respectively connected to the upper pump barrel and the upper pump outer pipe, and the lower end is respectively connected to the lower pump barrel and the lower pump outer pipe. The inner cavity of the connecting pipe in the annular cavity of the first intelligent control switch communicates with the upper pump annulus and the lower pump annulus.

10. The intelligent cable-downhole separate production system according to claim 7, wherein It further includes a pipe-passing fixed valve. The lower end of the pipe-passing fixed valve is connected to the lower pump string, and the upper end is respectively connected to the lower pump housing and the lower pump outer pipe. The pipe-passing fixed valve is used to open and close the channel between the inner cavity of the lower pump string and the lower pump cavity.

11. The downhole cable-connected intelligent separate production system according to claims 9-10, characterized in that, It further includes a centralizer and a thin steel pipe. The thin steel pipe includes several thin steel pipes, and the several thin steel pipes are used to communicate the annular cavity of the pipe-passing fixed valve with the inner cavity of the centralizer, and to communicate the inner cavity of the centralizer with the hydraulic cylinder cavities of the second pipe-passing packer and the first pipe-passing packer.

12. An intelligent cable-downhole separate production method, characterized in that, Implementing based on the downhole cable-connected intelligent separate production system according to any one of claims 1-11, includes the following steps: S1. The lower part of the second pipe-passing packer is sequentially connected with a centralizer, a third intelligent control switch, an oil pipe, and a plug. The steel pipe cable passed through is connected to the third intelligent control switch, and the thin steel pipe between the centralizer and the second pipe-passing packer is connected. S2. The lower part of the first pipe-passing packer is sequentially connected with a centralizer and a second intelligent control switch. The steel pipe cables at both ends of the second intelligent control switch are connected to each other, and the thin steel pipe between the centralizer and the first pipe-passing packer is connected. S3. After injecting mechanical oil into the thin steel pipe and passing the pressure test, it is connected to the pipe-passing fixed valve. The upper cable of the first intelligent control switch is connected to a computer to test whether each switch is normal. S4. Pressurize from the oil pipe, and sequentially set the cable-anchoring oil drainer and all pipe-passing packers, separating the outside of the oil pipe and the inside of the casing into several independent cavities. S5. By controlling the corresponding intelligent control switch to open or close, perform layered metering on each oil layer. The layered metering includes the following steps: S51. Set the three intelligent control switches to fully open to drain the residual liquid in the well during operation. S52. Open any one of the first intelligent control switch, the second intelligent control switch, and the third intelligent control switch. Each time an intelligent control switch is opened, independently produce for 3 to 5 days to obtain the oil production data of three intervals respectively. S53. According to the oil production data of the oil layers obtained in step S52, produce the oil layer corresponding to the first intelligent control switch, and at the same time produce the oil layer corresponding to the second intelligent control switch and the oil layer with the most oil production among the oil layers corresponding to the third intelligent control switch, to realize the independent production of two layers of oil liquid, or adjust the openings of the second and third switches with the aim of producing the most crude oil.

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