A liquid-controlled layered multi-channel injection-production pipe string and its use method and injection-production tool string

Abstract

The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical field of oil exploitation. The application discloses a liquid-controlled layered multi-channel injection-production pipe column and a use method and injection-production tool string thereof, and relates to the technical

Description

Technical Field

[0001] The present invention relates to the technical field of oil production, in particular to a liquid-controlled layered multi-channel injection and production string, a use method thereof, and an injection and production tool string. Background Art

[0002] As mature oil fields enter the late stages of production, the refined development of these reservoirs is entering a critical phase. During the energy and water injection phase, reservoir stratification is achieved through a combination of pipe strings, including packers and water distributors. In oilfield production, well fluid is pumped to the surface via downhole stratified pipe strings. However, due to structural limitations, existing pipe strings are unable to inject energy or perform stratified production in multi-layered, thin reservoirs, directly impacting recovery efficiency.

[0003] Publication (Announcement) No.: CN109322648A discloses a distribution string for oil well water injection, its use method, and injection and production tool string. The distribution string for oil well water injection includes a first packer connected to the wellhead through a first outer tube and a second outer tube arranged in parallel; a first dispenser connected to the lower end of the first packer through a third outer tube, a second packer connected to the lower end of the first dispenser through a fourth outer tube, a second packer connected to the lower end of the first packer through a fifth outer tube, and a third packer connected to the lower end of the second packer through a sixth outer tube; a second dispenser connected to the lower end of the third packer through a seventh outer tube, and a fourth packer connected to the lower end of the second dispenser through an eighth outer tube; and a first inner tube and a second inner tube. The first to fourth packers divide the strata, and the above-mentioned string and the first and second dispensers provide independent water injection channels for the four strata. The distribution string provided by the present invention effectively simplifies the stratified water injection operation and improves the efficiency of the water injection operation.

[0004] This prior art realizes stratified injection and production by running two tubing strings, which wastes downhole space and also has the technical problem of being prone to failure.

[0005] Publication (Announcement) No.: CN107165603B discloses an oilfield stratified liquid injection device, whose technical solution is: the upper joint and the lower joint are connected by a central tube, and a sealing piston, a constant pressure switch, a single flow slide body, a swivel pressure cap, and a swivel form a moving body. A constant pressure switch is provided between the sealing piston and the central tube, the lower part of the constant pressure switch is connected to the single flow slide body, the lower part of the single flow slide body is a swivel, the upper part of the swivel is connected through the swivel pressure cap, and the swivel rotates around the central tube, and an energy storage mechanism is provided at the lower part of the moving body, the bottom of the energy storage mechanism is connected to an energy storage pad, and the lower part of the energy storage pad is connected to a pressure regulating ring, the pressure regulating ring is connected to the sealing cylinder sleeve by a positioning pin, and a track is provided in the middle of the central tube; the beneficial effects of the present invention are: simple process, no need to lower multiple layers of tubing, clear injection, pressure is applied from top to bottom, down to the required water injection layer, multi-layer connected water injection is realized, the downhole water injection operation is adjustable and can be closed to realize stratified water injection, and can be combined at the same time.

[0006] This prior art uses a constant pressure switch for startup, but when the reservoir has more layers, there is a problem that the oil layers cannot be opened or closed at will.

[0007] Publication (Announcement) No.: CN105443092B discloses a four-tube stratified water injection process string, including casing and wellhead, with an upper bridge plug, a middle bridge plug and a lower bridge plug arranged in sequence from top to bottom in the casing, the upper bridge plug, the middle bridge plug and the lower bridge plug axially dividing the inside of the casing into four sections, each section corresponding to a water injection layer section, the water injection pipe is composed of a coaxial outer oil pipe, a middle oil pipe and an inner oil pipe, the outer oil pipe, the middle oil pipe and the inner oil pipe radially dividing the inside of the casing into an outer annular water injection channel, an outer middle annular water injection channel, a middle inner annular water injection channel and a central water injection channel, each layer section of the four-tube stratified water injection process string has an independent water injection channel, no water distribution device is required underground, and quantitative water distribution is completed by ground operation, the water distribution volume control is more precise and the adjustment is more convenient, the four-tube stratified water injection process string has the advantages of simple structure, reliable operation, easy operation and easy maintenance.

[0008] This prior art uses concentric tubes to complete the layering. In order to prevent the inner tube from shaking, a large number of internal supports are required, which will create resistance to the internal fluid, affect production efficiency, and be prone to failure.

[0009] In short, the technical solutions, technical problems to be solved and beneficial effects produced by the above-mentioned disclosed technologies are all different from the present invention. Regarding more technical features, technical problems to be solved and beneficial effects of the present invention, the above-mentioned disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0010] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a hydraulically controlled layered multi-channel injection and production string, a method for using the same, and an injection and production tool string. The tool string is composed of a hydraulically controlled switch device, a layered close-fitting device, and a porous short section. The tool string is assembled with a hanging packer, a sealing tube, and a sand filter tube to form an injection and production string for multi-layer oil reservoir development. The string can be used to effectively inject energy or produce oil in multi-layer oil reservoirs as needed.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] A hydraulically controlled stratified multi-channel injection and production string comprises an oil pipe, a casing, and a suspended stratified screen pipe string, wherein the suspended stratified screen pipe string is arranged in the casing, and at least two sand filter units are arranged in the suspended stratified screen pipe string. The string also comprises an injection and production tool string, wherein the upper end of the injection and production tool string is connected to the oil pipe, and the injection and production tool string comprises the same number of hydraulic control units and injection and production units; the injection and production units are arranged below the lowest hydraulic control unit, and the injection and production units are arranged in the suspended stratified screen pipe string, and one sand filter unit corresponds to one injection and production unit.

[0013] Furthermore, the suspended stratified screen string further comprises a suspended stratified packer, which is arranged at the top of the sand filter unit;

[0014] Specifically, a layered packer is set between every two sand filter units;

[0015] Specifically, the sand filter unit includes a sealing cylinder and a sand filter tube connected together;

[0016] Specifically, the injection and production unit includes closely connected plug-in and short sections;

[0017] Specifically, after the injection and production tool string is lowered into the suspended layered screen pipe string, the short sections correspond to the sand filter pipes one by one.

[0018] Furthermore, three sand filtering units are provided, three injection and production units are provided, and three liquid control units are provided;

[0019] Specifically, the hanging stratified screen string includes a hanging packer, a first sealing cylinder, a first sand filter, a first stratified packer, a second sealing cylinder, a second sand filter, a second stratified packer, a third sealing cylinder, and a third sand filter, which are sequentially connected from top to bottom.

[0020] Specifically, the injection and production tool string includes, from top to bottom, a first hydraulically controlled switch device, a second hydraulically controlled switch device, a third hydraulically controlled switch device, a total short section, a first layered close-fitting insert, a first short section, a second layered close-fitting insert, a second short section, a third layered close-fitting insert, and a third short section.

[0021] Furthermore, the first liquid-controlled switch device includes a first liquid inlet pipe, the upper end of the first liquid inlet pipe is closed, the lower end is provided with a first liquid inlet countersunk hole, and the side wall of the first liquid inlet pipe is provided with a first liquid inlet side hole connected to the first liquid inlet countersunk hole; the first liquid inlet pipe is provided with a first liquid inlet control device above the first liquid inlet side hole;

[0022] Specifically, the second liquid-controlled switch device includes a second liquid inlet pipe, a second liquid inlet counterbore is provided at the lower end of the second liquid inlet pipe, a second liquid inlet side hole is provided on the side wall of the second liquid inlet pipe and is connected to the second liquid inlet counterbore, and the second liquid inlet pipe is provided with a second first flow passage; the second liquid inlet pipe is provided with a second liquid inlet control device above the second liquid inlet side hole;

[0023] Specifically, the third liquid-controlled switch device includes a third liquid inlet pipe, a third liquid inlet countersunk hole is provided at the lower end of the third liquid inlet pipe, a third liquid inlet side hole is provided on the side wall of the third liquid inlet pipe and is connected to the third liquid inlet countersunk hole, and the third liquid inlet pipe is provided with a third flow channel No. 1 and a third flow channel No. 2 that are connected to each other; the third liquid inlet pipe is provided with a third liquid inlet control device above the third liquid inlet side hole.

[0024] Furthermore, the first liquid inlet control device, the second liquid inlet control device, and the third liquid inlet control device have the same structure, and all include a hydraulic plunger, a guide plug, a spring sleeve, a piston, and a spring;

[0025] Specifically, the first liquid inlet pipe, the second liquid inlet pipe, or the third liquid inlet pipe is provided with an annular piston seat, and the annular piston seat is provided with a pressure transmission hole and a guide hole;

[0026] Specifically, the upper end of the spring sleeve is connected to the outer wall of the annular piston seat, the piston is sleeved in the spring sleeve, and the spring fixes the spring sleeve and pushes up the piston so that the piston sits on the lower end surface of the annular piston seat;

[0027] Specifically, the inner cylindrical surface of the lower end of the spring sleeve is provided with a limit step, which is the limit position surface for the downward movement of the lower end surface of the piston;

[0028] Specifically, the spring sleeve is provided with a lateral hole above the limiting step, and the lateral hole is communicated with the first liquid inlet side hole, the second liquid inlet side hole, or the third liquid inlet side hole;

[0029] Specifically, the hydraulic plunger is arranged in the pressure transmission hole, the guide plug is arranged in the guide hole, and the lower end of the guide plug is connected to the upper end of the piston.

[0030] Furthermore, the main short section is provided with a fourth flow channel No. 1, a fourth flow channel No. 2, and a fourth flow channel No. 3;

[0031] Specifically, the first layered close-fitting includes a first base tube, in which a fifth flow channel No. 1, a fifth flow channel No. 2, and a fifth flow channel No. 3 are provided; and a first sealing device is sleeved on an outer wall of the first base tube;

[0032] Specifically, the first short section is provided with a first liquid outlet sink hole, a sixth flow channel No. 2, and a sixth flow channel No. 1, and a side wall of the first short section is provided with a first liquid outlet side hole connected to the first liquid outlet sink hole;

[0033] Specifically, the second layered close-insertion includes a second base tube, a seventh flow channel No. 1 and a seventh flow channel No. 2 are provided in the second base tube; and a second sealing device is sleeved on the outer wall of the second base tube;

[0034] Specifically, the second short section is provided with a second liquid outlet counterbore and an eighth flow channel No. 2, and the side wall of the second short section is provided with a second liquid outlet side hole communicating with the second liquid outlet counterbore;

[0035] Specifically, the third layered close-insertion includes a third base tube, a ninth second flow passage is provided in the third base tube; and a third sealing device is sleeved on the outer wall of the third base tube;

[0036] Specifically, a third liquid outlet is provided in the third short section.

[0037] Furthermore, the first sealing device, the second sealing device and the third sealing device have the same structure, and all include an adjustment sleeve, a sealing assembly, a spacer ring and a sealing assembly positioning sleeve;

[0038] Specifically, the adjusting sleeve is threadedly connected to the outer wall of the first base pipe, the second base pipe, or the third base pipe, the positioning sleeve is threadedly connected to the outer wall of the first base pipe, the second base pipe, or the third base pipe, and is arranged below the adjusting sleeve, and at least two sealing assemblies are arranged between the adjusting sleeve and the positioning sleeve, and a spacer ring is arranged between every two sealing assemblies.

[0039] Furthermore, the first liquid inlet pipe, the second liquid inlet pipe, and the third liquid inlet pipe are connected in sequence through a pipe connection kit;

[0040] Specifically, the third liquid inlet pipe is connected to the main short section via a pipeline connection kit;

[0041] Specifically, the short section is connected to the base pipe through an upper connecting piece and a lower connecting piece.

[0042] Furthermore, after the injection-production tool string is connected, the first liquid inlet counterbore, the second flow channel No. 1, the third flow channel No. 1, the fourth flow channel No. 1, the fifth flow channel No. 1, the sixth flow channel No. 1, the seventh flow channel No. 1, and the second liquid outlet counterbore overlap, so that the first liquid inlet side hole is connected to the second liquid outlet side hole;

[0043] Specifically, the second liquid inlet counterbore, the third flow channel No. 2, the fourth flow channel No. 2, the fifth flow channel No. 2, the sixth flow channel No. 2, the seventh flow channel No. 2, the eighth flow channel No. 2, the ninth flow channel No. 2, and the third liquid outlet hole overlap, so that the second liquid inlet side hole is connected to the third liquid outlet hole;

[0044] Specifically, the third liquid inlet counterbore, the fourth flow channel No. 3, the fifth flow channel No. 3, and the first liquid outlet counterbore overlap, so that the third liquid inlet side hole is connected to the first liquid outlet side hole.

[0045] Furthermore, the two components connected by the connection kit are referred to as an upper component to be connected and a lower component to be connected;

[0046] Specifically, the pipe connection kit includes a porous sealing gasket, a first positioning pin, a ferrule and a connecting sleeve; the lower end of the upper part to be connected and the upper end of the lower part to be connected are both provided with positioning holes;

[0047] Specifically, the positioning hole is connected by plugging in a first positioning pin, the porous sealing gasket is arranged between the two parts to be connected, the porous sealing gasket is provided with holes corresponding to the two liquid inlet pipes, the clamping sleeve is arranged on the upper outer wall of the lower part to be connected, the lower end of the connecting sleeve is provided with an inner cylindrical step clamped under the clamping sleeve, and the upper end of the connecting sleeve is connected to the lower outer wall of the spring sleeve of the upper part to be connected.

[0048] Furthermore, the upper end of the upper connecting member is connected to the short section, and the lower end is connected to the base pipe; the upper end of the lower connecting member is connected to the base pipe, and the lower end is connected to the short section;

[0049] Specifically, the short section connected by the upper connector and the layered close insertion are called the upper short section and the lower base pipe;

[0050] Specifically, the upper connecting piece includes a close-fitting connection sleeve, a close-fitting ferrule, and a second porous sealing gasket. The close-fitting ferrule is threadedly connected to the outer wall of the upper end of the lower base pipe. The lower end of the close-fitting connection sleeve is provided with an inner cylindrical step that is clamped below the close-fitting ferrule, and the upper end is threadedly connected to the outer wall of the upper short section. The second porous sealing gasket is provided between the upper short section and the lower base pipe.

[0051] Specifically, the short section and the base pipe connected by the lower connector are referred to as the lower short section and the upper base pipe;

[0052] Specifically, the lower connecting piece includes a third porous sealing gasket, a short section connecting sleeve, and a short section ferrule; the short section ferrule is threadedly connected to the outer wall of the upper end of the lower short section, the lower end of the short section connecting sleeve is provided with an inner cylindrical step clamped below the short section ferrule, and the upper end is threadedly connected to the outer wall of the upper base pipe, and the third porous sealing gasket is provided between the lower short section and the upper base pipe;

[0053] Specifically, the short section and the base pipe are positioned by a second positioning pin.

[0054] In order to achieve the above object, the present invention adopts the following technical solutions:

[0055] A method for using a liquid-controlled layered multi-channel injection and production string comprises the following steps:

[0056] S1. Arrange the suspended layered screen string. Set the same number of sand filter units according to the number of reservoir development layers. Set a layered packer between every two sand filter units, and set a suspended packer on the top. After assembly, lower the suspended layered screen string into the well, with one sand filter unit corresponding to one reservoir development layer. Complete the hanging and release.

[0057] S2. Prepare the injection-production tool string. Install the same number of hydraulic control units and injection-production units as the number of sand filter units. Connect all the hydraulic control units together to form a hydraulic control pipe string. Connect all the injection-production units together to form an injection-production pipe string. Use a main nipple to connect the lower end of the hydraulic control pipe string to the upper end of the injection-production pipe string. Connect all the hydraulic control pipelines to the pressure transmission holes of each hydraulic control unit.

[0058] S3. Lower the injection and production tool string into the well, so that the injection and production units correspond to the sand filter units one by one, and the sealing assembly in the injection and production unit is sealed with the sealing cylinder of the sand filter unit;

[0059] S4. Layered polymer injection: The liquid inlet side holes are controlled by the hydraulic control pipeline. According to the construction requirements, the hydraulic control pipeline is used to control the hydraulic switch to open the liquid inlet side holes corresponding to the oil layer to be constructed; water or polymer is injected, and the water or polymer enters the injection and production tool string through the casing annulus to reach the designated oil layer.

[0060] Furthermore, the working process of the hydraulically controlled switch device is to pressurize the hydraulic control pipeline to make the guide plug move downward, and then make the piston move downward, blocking the liquid inlet side hole, stop pressurizing, and reset the piston under the action of the spring, and the liquid inlet side hole is connected.

[0061] Furthermore, an oil production pump adapted to the well depth and reservoir characteristics is connected to the oil pipe above the upper hydraulic control switch device to form an oil production pipe string.

[0062] The opening and closing degree of the liquid outlet side holes is controlled by the hydraulic control pipeline to achieve the regulation of the production volume of each oil layer.

[0063] In order to achieve the above object, the present invention adopts the following technical solutions:

[0064] A hydraulically controlled layered multi-channel injection and production tool string comprises a hydraulically controlled pipe string and an injection and production pipe string; the hydraulically controlled pipe string and the injection and production pipe string are connected via a main short section; at least two hydraulically controlled units are provided in the hydraulically controlled tool; at least two injection and production units are provided in the injection and production pipe string; the number of the injection and production units is the same as that of the hydraulically controlled units; the injection and production units comprise closely connected short sections.

[0065] Furthermore, the liquid control unit and the injection and production unit are both provided with N;

[0066] Specifically, the Nth liquid inlet pipe in the Nth liquid-controlled switch device has an Nth liquid inlet counterbore at its lower end, an Nth liquid inlet side hole communicating with the Nth liquid inlet counterbore at its side wall, and an Nth flow passage N-1, Nth flow passage N-1, ..., and Nth flow passage No. 1, all of which are connected thereto. Furthermore, an Nth liquid inlet control device is provided above the Nth liquid inlet side hole. ...; the first liquid inlet pipe in the first liquid control unit has a closed upper end, a first liquid inlet counterbore at its lower end, a first liquid inlet side hole communicating with the first liquid inlet counterbore at its side wall, and a first liquid inlet control device provided above the first liquid inlet side hole.

[0067] Specifically, the main short section is provided with a 1+Nth flow channel No. 1, a 1+Nth flow channel No. 2, ..., a 1+Nth flow channel No. N;

[0068] Specifically, the first base tube in the first layered close-insertion is provided with the 1+N+1 flow channel No. 1, the 1+N+1 flow channel No. 2, ..., the 1+N+N flow channel No. N; the outer wall of the first base tube is provided with a first sealing device; the first short section is provided with a first liquid outlet counterbore, and the side wall is provided with a first liquid outlet side hole connected to the first liquid outlet counterbore; the 1+N+1 flow channel No. 2, ..., the 1+N+N flow channel No. N; ...; the Nth base tube in the Nth layered close-insertion is provided with the 1+N+N flow channel No. N; the outer wall of the third base tube is provided with a third sealing device; the Nth short section is provided with the Nth liquid outlet.

[0069] Furthermore, the liquid inlet pipes are connected in sequence via a pipe connection kit;

[0070] Specifically, the Nth liquid inlet pipe is connected to the main nipple through a pipe connection kit;

[0071] Specifically, the short section and the base pipe are connected through an upper connecting piece and a lower connecting piece;

[0072] Make the first liquid inlet sink hole, the first flow channel No. 1, ..., the Nth flow channel No. 1, ..., the 1+N+1th flow channel No. 1, and the first liquid outlet sink hole overlap; ...; make the Nth liquid inlet sink hole, the 1+Nth flow channel No. N, ..., the 1+N+Nth flow channel No. N, and the Nth liquid outlet hole overlap.

[0073] Compared with the prior art, the present invention has the following beneficial effects:

[0074] 1. This invention incorporates multiple hydraulically controlled switch devices, multiple pup joints, and multiple layers of closely spaced inserts, creating multiple channels that allow fluid to flow in one direction and can be hydraulically shut off at any time. Compared to traditional packer-and-sleeve-based stratified string systems, this invention is more suitable for multi-layer reservoir development.

[0075] 2. Compared with the traditional underground stratified mining process, the present invention has densely inserted isolation between stratified pipe strings and mechanical hard isolation inside the pipe, which makes underground stratification highly reliable and simple to maintain later;

[0076] 3. When the present invention is used on site, water or polymer is injected into the annulus of the oil casing, and the upper, middle and lower hydraulic control switch devices are operated by hydraulic control to replenish energy to the oil layer and reservoir that need water injection or polymer injection.

[0077] 4. When the present invention is in use, an oil pump is installed in the oil pipe above the hydraulic control pipe string to form a layered production string, and the oil layer to be produced is hydraulically controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 This is a schematic diagram of the structure of a liquid-controlled layered multi-channel injection and production string of the present invention;

[0079] Figure 2 This is a structural schematic diagram of a hydraulically controlled switch device for a hydraulically controlled layered multi-channel injection and production string according to the present invention;

[0080] Figure 3 This is a schematic structural diagram of the third layer of close-insertion of a liquid-controlled layered multi-channel injection and production string of the present invention;

[0081] Figure 4 This is a bottom-up schematic diagram of a liquid inlet pipe of a liquid-controlled layered multi-channel injection and production string according to the present invention;

[0082] Figure 5 It is a top view schematic diagram of a short section of a liquid-controlled layered multi-channel injection and production string according to the present invention;

[0083] In the figure: 1, casing; 2, oil pipe; 201, first hydraulic control pipeline; 202, second hydraulic control pipeline; 203, third hydraulic control pipeline;

[0084] 3. First hydraulically controlled switch device; 301. First liquid inlet pipe; 302. Hydraulic plunger; 303. Guide plug; 304. Spring sleeve; 305. Piston; 306. Spring; 307. Connecting sleeve; 308. Porous sealing gasket; 309. Positioning pin; 310. Adapter sleeve; 311. First liquid inlet counterbore; 314. First positioning hole; 315. First liquid inlet side hole; 316. Spring sleeve side hole; 317. Spring sleeve inner step;

[0085] 4. Second hydraulically controlled switch device; 401. Second liquid inlet pipe; 411. Second overflow channel No. 1; 412. Second liquid inlet counterbore; 414. Second liquid inlet side hole;

[0086] 5. Lower liquid-controlled switch device; 501. Third liquid inlet pipe; 511. Third overflow channel No. 1; 512. Third overflow channel No. 2; 513. Third liquid inlet countersunk hole; 514. Third liquid inlet side hole;

[0087] 6. Suspension packer; 601. First layer packer; 602. Second layer packer;

[0088] 701, fourth flow channel No. 3; 702, fourth flow channel No. 1; 703, fourth flow channel No. 2; 704, sixth flow channel No. 2; 705, first liquid outlet countersunk hole; 706, sixth flow channel No. 1; 707, second liquid outlet countersunk hole; 708, eighth flow channel No. 2; 709, third liquid outlet hole; 711, main sub; 712, first sub; 713, second sub; 714, third sub; 7051, first liquid outlet side hole; 7071, second liquid outlet side hole;

[0089] 811. The first sealing cylinder; 812. The second sealing cylinder; 813. The third sealing cylinder;

[0090] 901, tight-fitting connection sleeve; 902, tight-fitting ferrule; 903, third base tube; 904, adjustment sleeve; 905, sealing assembly; 906, spacer ring; 907, positioning sleeve; 908, third porous sealing gasket; 909, second positioning pin; 911, first layer tight-fitting; 912, second layer tight-fitting; 913, third layer tight-fitting;

[0091] 1011, first sand filter tube; 1012, second sand filter tube; 1013, third sand filter tube. DETAILED DESCRIPTION

[0092] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0093] Example 1:

[0094] See also Figures 1 to 5 The present invention provides a liquid-controlled layered multi-channel injection and production string and its injection and production tool string, including an injection and production tool string and a suspended layered screen tube string; the suspended layered screen tube string is arranged in the casing 1, and the injection and production tool string is arranged at the lower end of the oil pipe 1.

[0095] The suspended stratified screen string includes a suspended packer 6, a sand filter unit, and a stratified packer. At least two sand filter units are provided below the suspended packer 6, and a stratified packer is provided between every two sand filter units. The sand filter unit includes a sealing cylinder and a sand filter tube connected together.

[0096] The injection and production tool string includes a hydraulic control unit and an injection and production unit. The injection and production unit is arranged below the lowest hydraulic control unit. The number of the injection and production units is consistent with that of the sand filter units. The injection and production units include closely connected short sections. After the injection and production tool string is lowered into the suspended layered screen pipe string, the short sections correspond one-to-one to the sand filter pipes.

[0097] This embodiment is described with three sand filter units, three liquid control units, and three injection and production units. However, in actual application, the number of sand filter units is not limited to three. At the same time, the liquid control units and the injection and production units can correspond to each other in order or not. Figures 1 to 5 To correspond out of order;

[0098] Specifically, the first liquid control unit corresponds to the second injection and production unit, the second liquid control unit corresponds to the third injection and production unit, and the third liquid control unit corresponds to the first injection and production unit.

[0099] The suspended stratified screen string includes a suspended packer 6, a first sealing cylinder 811, a first sand filter tube 1011, a first stratified packer 601, a second sealing cylinder 812, a second sand filter tube 1012, a second stratified packer 602, a third sealing cylinder 813, and a third sand filter tube 1013, which are sequentially connected from top to bottom.

[0100] The injection and production tool string includes, from top to bottom, the first hydraulically controlled switch device 3, the second hydraulically controlled switch device 4, the third hydraulically controlled switch device 5, the main short section 711, the first layered close-fitting insert 811, the first short section 712, the second layered close-fitting insert 912, the second short section 713, the third layered close-fitting insert 913, and the third short section 714.

[0101] Please refer to Figure 1 、 Figure 2 、 Figure 4 As shown, the first liquid-controlled switch device 3 includes a first liquid inlet pipe 301, the upper end of the first liquid inlet pipe 301 is closed, and the lower end is provided with a first liquid inlet countersunk hole 311, and the side wall of the first liquid inlet pipe 301 is provided with a first liquid inlet side hole 315 connected to the first liquid inlet countersunk hole 311; the first liquid inlet pipe 301 is provided with a first liquid inlet control device above the first liquid inlet side hole 315.

[0102] The second liquid-controlled switch device 4 includes a second liquid inlet pipe 401, a second liquid inlet countersunk hole 412 is provided at the lower end of the second liquid inlet pipe 401, a second liquid inlet side hole 414 connected to the second liquid inlet countersunk hole 412 is provided on the side wall of the second liquid inlet pipe 401, and the second liquid inlet pipe 401 is provided with a through second flow channel No. 1 411; the second liquid inlet pipe 401 is provided with a second liquid inlet control device above the second liquid inlet side hole 414.

[0103] The third liquid-controlled switch device 5 includes a third liquid inlet pipe 501, a third liquid inlet countersunk hole 513 is provided at the lower end of the third liquid inlet pipe 501, a third liquid inlet side hole 514 is provided on the side wall of the third liquid inlet pipe 501 and is connected to the third liquid inlet countersunk hole 513, and the third liquid inlet pipe 501 is provided with a third flow channel No. 1 511 and a third flow channel No. 2 512 that are connected to each other; the third liquid inlet pipe 501 is provided with a third liquid inlet control device above the third liquid inlet side hole 514.

[0104] The first liquid inlet control device, the second liquid inlet control device, and the third liquid inlet control device have the same structure and all include a hydraulic plunger 302, a guide plug 303, a spring sleeve 304, a piston 305, and a spring 306; the first liquid inlet pipe 301 or the second liquid inlet pipe 401 or the third liquid inlet pipe 501 are all provided with an annular piston seat, and the annular piston seat is provided with a pressure transmission hole and a guide hole; the upper end of the spring sleeve 304 is connected to the outer wall of the annular piston seat, and the piston 305 is sleeved in the spring sleeve 304, and the spring 306 fixes the spring sleeve at the bottom and pushes the piston 305 upward. 05, so that the piston 305 sits on the lower end surface of the annular piston seat; the inner cylindrical surface of the lower end of the spring sleeve 304 is provided with a limit step 316, which is the extreme position surface for the downward movement of the lower end surface of the piston 305; the spring sleeve 304 is provided with a lateral hole 317 above the limit step 316, and the lateral hole 317 is connected to the first liquid inlet side hole 315 or the second liquid inlet side hole 414 or the third liquid inlet side hole 514; the hydraulic plunger 302 is arranged in the pressure transmission hole, and the guide plug 303 is arranged in the guide hole, and the lower end of the guide plug 303 is connected to the upper end of the piston 305.

[0105] The first pressure transmission hole of the first liquid inlet control device is connected to the first hydraulic control line 201 ; the second pressure transmission hole of the second liquid inlet control device is connected to the second hydraulic control line 202 ; the third pressure transmission hole of the third liquid inlet control device is connected to the third hydraulic control line 203 .

[0106] The method of using the liquid inlet control device is explained using the first hydraulic switch device 3. When in use, the first pressure transmission hole of the first liquid inlet control device is connected to the first hydraulic control pipeline 201. Pressure is applied through the first hydraulic control pipeline 201 to move the first guide plug downward, thereby moving the first piston downward, blocking the first liquid inlet side hole 315. When pressure is stopped, the first piston returns to its original position under the action of the first spring, and the first liquid inlet side hole 31 is connected.

[0107] The first liquid inlet pipe 301, the second liquid inlet pipe 401, and the third liquid inlet pipe 501 are connected in sequence through a pipeline connection kit. The two connected liquid inlet pipes are called the upper part to be connected and the lower part to be connected. The pipeline connection kit includes a porous sealing gasket 308, a first positioning pin 309, a clamping sleeve 310 and a connecting sleeve 307; the lower end of the upper part to be connected and the upper end of the lower part to be connected are both provided with positioning holes; the positioning holes are plugged and connected by the first positioning pin 309, the porous sealing gasket 308 is arranged between the two parts to be connected, and the porous sealing gasket 308 is provided with holes corresponding to the two liquid inlet pipes, the clamping sleeve 310 is arranged on the outer wall of the upper end of the lower part to be connected, and the lower end of the connecting sleeve 307 is provided with an inner cylindrical step stuck below the clamping sleeve 310, and the upper end of the connecting sleeve 307 is connected to the outer wall of the lower end of the spring sleeve of the upper part to be connected.

[0108] After the first liquid inlet pipe 301, the second liquid inlet pipe 401, and the third liquid inlet pipe 501 are connected, the first liquid inlet counterbore 311, the second flow channel No. 1 411, and the third flow channel No. 1 511 overlap; the second liquid inlet counterbore 412 and the third flow channel No. 2 512 overlap.

[0109] The main short section 711 is provided with a fourth flow channel No. 1 702, a fourth flow channel No. 2 703, and a fourth flow channel No. 3 701;

[0110] The first layered close-fitting insert 911 includes a first base tube, in which a fifth flow channel No. 1, a fifth flow channel No. 2, and a fifth flow channel No. 3 are provided; and a first sealing device is sleeved on the outer wall of the first base tube;

[0111] The first short section 712 is provided with a first liquid outlet sink hole 705, a sixth flow channel No. 2 704, and a sixth flow channel No. 1 706. The side wall of the first short section 712 is provided with a first liquid outlet side hole 7051 connected to the first liquid outlet sink hole 705.

[0112] The second layered close-fitting insert 912 includes a second base tube, in which a seventh flow channel No. 1 and a seventh flow channel No. 2 are provided; and a second sealing device is sleeved on the outer wall of the second base tube;

[0113] The second short section 713 is provided with a second liquid outlet sink hole 707 and an eighth flow channel No. 2 708 . The side wall of the second short section 713 is provided with a second liquid outlet side hole 7071 communicating with the second liquid outlet sink hole 707 .

[0114] The third layered close-fitting insert 913 includes a third base tube 903 , in which a ninth second flow passage is provided; and a third sealing device is sleeved on the outer wall of the third base tube 903 ;

[0115] The third short section 714 is provided with a third liquid outlet 709 .

[0116] The first sealing device, the second sealing device, and the third sealing device have the same structure and all include an adjusting sleeve 904, a sealing assembly 905, a spacer ring 906, and a sealing assembly positioning sleeve 907; the adjusting sleeve 904 is threadedly connected to the outer wall of the first base pipe, the second base pipe, or the third base pipe 903, and the positioning sleeve 907 is threadedly connected to the outer wall of the first base pipe, the second base pipe, or the third base pipe 903 and is arranged below the adjusting sleeve 904; at least two sealing assemblies 905 are arranged between the adjusting sleeve 904 and the positioning sleeve 907, and a spacer ring 906 is arranged between every two sealing assemblies 905.

[0117] Connect the pup joint to the base pipe through an upper connecting piece and a lower connecting piece, wherein the upper end of the upper connecting piece is connected to the pup joint and the lower end is connected to the base pipe, and the upper end of the lower connecting piece is connected to the base pipe and the lower end is connected to the pup joint;

[0118] The short section connected by the upper connecting piece and the layered close-insertion are called the upper short section and the lower base pipe, and the upper connecting piece includes a close-insertion connecting sleeve 901, a close-insertion ferrule 902, and a second porous sealing gasket. The close-insertion ferrule 902 is threadedly connected to the outer wall of the upper end of the lower base pipe, and the lower end of the close-insertion connecting sleeve 901 is provided with an inner cylindrical step which is stuck under the close-insertion ferrule 902, and the upper end is threadedly connected to the outer wall of the upper short section. The second porous sealing gasket is arranged between the upper short section and the lower base pipe; the short section and the base pipe connected by the lower connecting piece are called the lower short section and the upper base pipe, and the lower connecting piece includes a third porous sealing gasket 908, a short section connecting sleeve, and a short section ferrule; the short section ferrule is threadedly connected to the outer wall of the upper end of the lower short section, and the lower end of the short section connecting sleeve is provided with an inner cylindrical step which is stuck under the short section ferrule, and the upper end is threadedly connected to the outer wall of the upper base pipe, and the third porous sealing gasket 908 is arranged between the lower short section and the upper base pipe.

[0119] The short section and the base pipe are positioned by a second positioning pin 909 .

[0120] The third liquid inlet pipe 501 is connected to the main short section 711 via a pipeline connection kit.

[0121] After the injection-production tool string is connected, the first liquid inlet countersunk hole 311, the second flow channel No. 1 411, the third flow channel No. 1 511, the fourth flow channel No. 1 702, the fifth flow channel No. 1, the sixth flow channel No. 1 706, the seventh flow channel No. 1, and the second liquid outlet countersunk hole 707 overlap, so that the first liquid inlet side hole 315 is connected to the second liquid outlet side hole 7071;

[0122] The second liquid inlet countersunk hole 412, the third second flow channel 512, the fourth second flow channel 703, the fifth second flow channel, the sixth second flow channel 704, the seventh second flow channel, the eighth second flow channel 708, the ninth second flow channel, and the third liquid outlet 709 overlap, so that the second liquid inlet side hole 414 is connected to the third liquid outlet 709;

[0123] The third liquid inlet sink hole 513 , the fourth flow channel No. 3 701 , the fifth flow channel No. 3 and the first liquid outlet sink hole 705 overlap, so that the third liquid inlet side hole 514 is connected to the first liquid outlet side hole 7051 .

[0124] Example 2:

[0125] This embodiment provides a method for using a liquid-controlled layered multi-channel injection and production string.

[0126] S1. Arrange the suspended layered screen string. Set the same number of sand filter units according to the number of reservoir development layers. Set a layered packer between every two sand filter units. Set the hanging packer 6 on the top. After assembly, lower the suspended layered screen string into the well. One sand filter unit corresponds to one reservoir development layer. Complete the hanging and releasing.

[0127] S2. Prepare the injection-production tool string. Install the same number of hydraulic control units and injection-production units as the number of sand filter units. Connect all the hydraulic control units together to form a hydraulic control pipe string. Connect all the injection-production units together to form an injection-production pipe string. Use a main nipple to connect the lower end of the hydraulic control pipe string to the upper end of the injection-production pipe string. Connect all the hydraulic control pipelines to the pressure transmission holes of each hydraulic control unit.

[0128] S3. Lower the injection and production tool string into the well, so that the injection and production units correspond to the sand filter units one by one, and the sealing assembly in the injection and production unit is sealed with the sealing cylinder of the sand filter unit;

[0129] S4, stratified polymer injection, control the opening and closing of the liquid inlet side holes through the hydraulic control pipeline, and open the liquid inlet side holes corresponding to the oil layer to be constructed according to the construction requirements;

[0130] Taking the oil reservoir as an example, when it is necessary to supplement energy for the second oil layer or inject a polymer suitable for the oil layer and reservoir, the first liquid inlet side hole 315 is opened, the second liquid inlet side hole 414 is closed, and the third liquid inlet side hole 514 is closed through the first hydraulic control pipeline 201, the second hydraulic control pipeline 202, and the third hydraulic control pipeline 203, and water or polymer is injected. The water or polymer flows through the oil casing annulus and enters the first liquid inlet sink hole 311, the second flow channel No. 1 411, the third flow channel No. 1 511, the fourth flow channel No. 1 702, the fifth flow channel No. 1, the sixth flow channel No. 1 706, the seventh flow channel No. 1, the second liquid outlet sink hole 707, reaches the second liquid outlet side hole 7071, and enters the second oil layer through the second sand filter pipe 1012.

[0131] By connecting an oil pump that is adapted to the well depth and reservoir characteristics to the oil pipe 2 above the upper hydraulically controlled switch device, an oil production string can be formed. The opening and closing degree of the liquid outlet side holes can be controlled by the hydraulically controlled pipeline to achieve regulation of the production volume of each oil layer.

[0132] Example 3:

[0133] This embodiment provides an injection and production tool string in which the hydraulic control units and the injection and production units can correspond one to one in order. An injection and production tool string for a hydraulically controlled layered multi-channel injection and production string includes a hydraulic control pipe string and an injection and production pipe string; the hydraulic control pipe string and the injection and production pipe string are connected by a main short section; at least two hydraulic control units are provided in the hydraulic control tool; at least two injection and production units are provided in the injection and production pipe string; the number of the injection and production units is the same as that of the hydraulic control units; and the injection and production units include closely connected short sections.

[0134] Furthermore, the liquid control unit and the injection and production unit are both provided with N;

[0135] Specifically, the lower end of the Nth liquid inlet pipe in the Nth liquid-controlled switch device is provided with an Nth liquid inlet counterbore, a side wall is provided with an Nth liquid inlet side hole connected to the Nth liquid inlet counterbore, an Nth flow passage No. N-1, an Nth flow passage No. N-1, ..., an Nth flow passage No. 1 are provided therein, and an Nth liquid inlet control device is provided above the Nth liquid inlet side hole;

[0136] ...;

[0137] The first liquid inlet pipe in the first liquid control unit is sealed at its upper end, provided with a first liquid inlet countersunk hole at its lower end, and provided with a first liquid inlet side hole in communication with the first liquid inlet countersunk hole on its side wall, and a first liquid inlet control device is provided above the first liquid inlet side hole;

[0138] Specifically, the main short section is provided with a 1+Nth flow channel No. 1, a 1+Nth flow channel No. 2, ..., a 1+Nth flow channel No. N;

[0139] Specifically, the first base tube in the first layered close-fitting arrangement is provided with a 1+N+1 flow channel No. 1, a 1+N+1 flow channel No. 2, ..., and a 1+N+N flow channel No. N; a first sealing device is sleeved on the outer wall of the first base tube; a first liquid outlet counterbore is provided in the first short section, and a first liquid outlet side hole connected to the first liquid outlet counterbore is provided on the side wall; a 1+N+1 flow channel No. 2, ..., and a 1+N+N flow channel No. N;

[0140] ...;

[0141] The Nth base tube tightly inserted in the Nth layer is provided with the 1+N+Nth flow channel N; the outer wall of the third base tube is sleeved with a third sealing device; the Nth short section is provided with the Nth liquid outlet.

[0142] Furthermore, the liquid inlet pipes are connected in sequence via a pipe connection kit;

[0143] Specifically, the Nth liquid inlet pipe is connected to the main nipple through a pipe connection kit;

[0144] Specifically, the short section and the base pipe are connected through an upper connecting piece and a lower connecting piece;

[0145] The first liquid inlet counterbore, the first flow channel No. 1, ..., the Nth flow channel No. 1, ..., the 1+N+1th flow channel No. 1, and the first liquid outlet counterbore are overlapped;

[0146] ...;

[0147] Make the Nth liquid inlet countersunk hole, the 1+Nth flow channel N, ..., the 1+N+Nth flow channel N, and the Nth liquid outlet hole coincide with each other.

[0148] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0149] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0150] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0151] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0152] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A hydraulically controlled stratified multi-channel injection and production string, comprising an oil pipe, a casing, and a suspended stratified screen string, wherein the suspended stratified screen string is arranged in the casing and at least two sand filter units are arranged in the suspended stratified screen string, characterized in that: It also includes an injection and production tool string, the upper end of which is connected to the oil pipe, and the injection and production tool string includes the same number of hydraulic control units and injection and production units; The injection and production unit is arranged below the lowest hydraulic control unit, and the injection and production unit is arranged in the suspended layered screen pipe string, and one sand filter unit corresponds to one injection and production unit; The injection and production tool string includes, from top to bottom, a first hydraulically controlled switch device, a second hydraulically controlled switch device, a third hydraulically controlled switch device, a main short section, a first layered close-fitting insert, a first short section, a second layered close-fitting insert, a second short section, a third layered close-fitting insert, and a third short section; The first liquid-controlled switch device includes a first liquid inlet pipe, the upper end of the first liquid inlet pipe is closed, the lower end is provided with a first liquid inlet countersunk hole, and the side wall of the first liquid inlet pipe is provided with a first liquid inlet side hole connected to the first liquid inlet countersunk hole; the first liquid inlet pipe is provided with a first liquid inlet control device above the first liquid inlet side hole; The second liquid-controlled switch device includes a second liquid inlet pipe, a second liquid inlet counterbore provided at the lower end of the second liquid inlet pipe, a second liquid inlet side hole provided on the side wall of the second liquid inlet pipe and communicating with the second liquid inlet counterbore, and a second first flow passage provided through the second liquid inlet pipe; a second liquid inlet control device is provided above the second liquid inlet side hole of the second liquid inlet pipe; The third liquid-controlled switch device includes a third liquid inlet pipe, a third liquid inlet countersunk hole is provided at the lower end of the third liquid inlet pipe, a third liquid inlet side hole is provided on the side wall of the third liquid inlet pipe and is connected to the third liquid inlet countersunk hole, and the third liquid inlet pipe is provided with a third flow channel No. 1 and a third flow channel No. 2 that are connected to each other; the third liquid inlet pipe is provided with a third liquid inlet control device above the third liquid inlet side hole; The first liquid inlet control device, the second liquid inlet control device, and the third liquid inlet control device have the same structure and all include a hydraulic plunger, a guide plug, a spring sleeve, a piston, and a spring; The first liquid inlet pipe, the second liquid inlet pipe or the third liquid inlet pipe is provided with an annular piston seat, and the annular piston seat is provided with a pressure transmission hole and a guide hole; The upper end of the spring sleeve is connected to the outer wall of the annular piston seat, and the piston is sleeved in the spring sleeve. The spring pushes the spring sleeve from below and pushes up the piston, so that the piston sits on the lower end surface of the annular piston seat; The inner cylindrical surface of the lower end of the spring sleeve is provided with a limit step, which is the limit position surface for the downward movement of the lower end surface of the piston; The spring sleeve is provided with a lateral hole above the limiting step, and the lateral hole is communicated with the first liquid inlet side hole, the second liquid inlet side hole, or the third liquid inlet side hole; The hydraulic plunger is arranged in the pressure transmission hole, the guide plug is arranged in the guide hole, and the lower end of the guide plug is connected to the upper end of the piston; The main short section is provided with a fourth flow channel No. 1, a fourth flow channel No. 2, and a fourth flow channel No. 3; The first layered close-fitting insert includes a first base tube, wherein a fifth flow channel No. 1, a fifth flow channel No. 2, and a fifth flow channel No. 3 are provided in the first base tube; and a first sealing device is sleeved on the outer wall of the first base tube; The first short section is provided with a first liquid outlet sink hole, a sixth flow channel No. 2, and a sixth flow channel No.

1. The side wall of the first short section is provided with a first liquid outlet side hole connected to the first liquid outlet sink hole; The second layered close-fitting comprises a second base tube, wherein a seventh flow channel No. 1 and a seventh flow channel No. 2 are provided in the second base tube; and a second sealing device is sleeved on the outer wall of the second base tube; The second short section is provided with a second liquid outlet counterbore and an eighth flow channel No. 2, and the side wall of the second short section is provided with a second liquid outlet side hole communicating with the second liquid outlet counterbore; The third layered close-fitting insert comprises a third base tube, a ninth second flow passage is provided in the third base tube, and a third sealing device is sleeved on the outer wall of the third base tube; The third short section is provided with a third liquid outlet.

2. The liquid-controlled stratified multi-channel injection and production string according to claim 1, characterized in that: The suspended stratified screen string further comprises a suspended packer and a stratified packer, wherein the suspended packer is arranged at the top of the sand filter unit; A layered packer is set between every two sand filter units; The sand filter unit includes a sealing cylinder and a sand filter tube connected together; The injection and production unit includes closely connected plugs and short sections; After the injection and production tool string is lowered into the suspended layered screen pipe string, the short sections correspond to the sand filter pipes one by one.

3. The liquid-controlled stratified multi-channel injection and production string according to claim 2, characterized in that: Three sand filter units are provided, three injection and production units are provided, and three liquid control units are provided; The hanging layered screen string includes a hanging packer, a first sealing cylinder, a first sand filter tube, a first layered packer, a second sealing cylinder, a second sand filter tube, a second layered packer, a third sealing cylinder, and a third sand filter tube, which are sequentially connected from top to bottom.

4. The liquid-controlled stratified multi-channel injection and production string according to claim 1, characterized in that: The first sealing device, the second sealing device and the third sealing device have the same structure and all include an adjustment sleeve, a sealing assembly, a spacer ring and a sealing assembly positioning sleeve; The adjusting sleeve is threadedly connected to the outer wall of the first base pipe, the second base pipe, or the third base pipe. The positioning sleeve is threadedly connected to the outer wall of the first base pipe, the second base pipe, or the third base pipe and is arranged below the adjusting sleeve. At least two sealing assemblies are arranged between the adjusting sleeve and the positioning sleeve, and a spacer ring is arranged between every two sealing assemblies.

5. The liquid-controlled layered multi-channel injection and production string according to claim 1, characterized in that: The first liquid inlet pipe, the second liquid inlet pipe, and the third liquid inlet pipe are connected in sequence through a pipe connection kit; The third liquid inlet pipe is connected to the main short section via a pipeline connection kit; The short section is connected to the base pipe through the upper connecting piece and the lower connecting piece.

6. The liquid-controlled layered multi-channel injection and production string according to claim 5, characterized in that: After the injection-production tool string is connected, the first liquid inlet countersunk hole, the second flow channel No. 1, the third flow channel No. 1, the fourth flow channel No. 1, the fifth flow channel No. 1, the sixth flow channel No. 1, the seventh flow channel No. 1, and the second liquid outlet countersunk hole overlap, so that the first liquid inlet side hole is connected to the second liquid outlet side hole; The second liquid inlet counterbore, the third flow channel No. 2, the fourth flow channel No. 2, the fifth flow channel No. 2, the sixth flow channel No. 2, the seventh flow channel No. 2, the eighth flow channel No. 2, the ninth flow channel No. 2, and the third liquid outlet hole overlap, so that the second liquid inlet side hole is connected to the third liquid outlet hole; The third liquid inlet sink hole, the fourth flow channel No. 3, the fifth flow channel No. 3, and the first liquid outlet sink hole overlap, so that the third liquid inlet side hole is connected to the first liquid outlet side hole.

7. The liquid-controlled stratified multi-channel injection and production string according to claim 5, characterized in that: The two parts connected by the connection kit are called the upper part to be connected and the lower part to be connected; The pipe connection kit includes a porous sealing gasket, a first positioning pin, a ferrule and a connecting sleeve; the lower end of the upper part to be connected and the upper end of the lower part to be connected are both provided with positioning holes; The positioning hole is connected by plugging through the first positioning pin, the porous sealing gasket is arranged between the two parts to be connected, the porous sealing gasket is provided with holes corresponding to the two liquid inlet pipes, the clamping sleeve is arranged on the outer wall of the upper end of the lower part to be connected, the lower end of the connecting sleeve is provided with an inner cylindrical step clamped under the clamping sleeve, and the upper end of the connecting sleeve is connected to the outer wall of the lower end of the spring sleeve of the upper part to be connected.

8. The liquid-controlled stratified multi-channel injection-production string according to claim 5, characterized in that: The upper end of the upper connecting piece is connected to the short section, and the lower end is connected to the base pipe; the upper end of the lower connecting piece is connected to the base pipe, and the lower end is connected to the short section; The short section connected by the upper connector and the layered close insertion are called the upper short section and the lower base pipe; The upper connecting piece includes a close-fitting connection sleeve, a close-fitting ferrule, and a second porous sealing gasket. The close-fitting ferrule is threadedly connected to the outer wall of the upper end of the lower base pipe. The lower end of the close-fitting connection sleeve is provided with an inner cylindrical step that is clamped below the close-fitting ferrule, and the upper end is threadedly connected to the outer wall of the upper short section. The second porous sealing gasket is provided between the upper short section and the lower base pipe. The short section and base pipe connected by the lower connector are called the lower short section and the upper base pipe; The lower connecting piece includes a third porous sealing gasket, a short section connecting sleeve, and a short section ferrule; the short section ferrule is threadedly connected to the outer wall of the upper end of the lower short section, the lower end of the short section connecting sleeve is provided with an inner cylindrical step clamped below the short section ferrule, and the upper end is threadedly connected to the outer wall of the upper base pipe, and the third porous sealing gasket is provided between the lower short section and the upper base pipe; The short section and the base pipe are positioned by a second positioning pin.

9. A method for using the liquid-controlled layered multi-channel injection-production string according to any one of claims 1 to 8, characterized in that: The following steps are included: S1. Arrange the suspended layered screen string and run the suspended layered screen string so that one sand filter unit corresponds to one reservoir development layer. S2. Prepare the injection-production tool string. Install the same number of hydraulic control units and injection-production units as the number of sand filter units. Connect all the hydraulic control units together to form a hydraulic control pipe string. Connect all the injection-production units together to form an injection-production pipe string. Use a main nipple to connect the lower end of the hydraulic control pipe string to the upper end of the injection-production pipe string. Connect all the hydraulic control pipelines to the pressure transmission holes of each hydraulic control unit. S3. Lower the injection and production tool string into the well, so that the injection and production units correspond to the sand filter units one by one, and the sealing assembly in the injection and production unit is sealed with the sealing cylinder of the sand filter unit; S4. Layered polymer injection: The liquid inlet side holes are controlled by the hydraulic control pipeline. According to the construction requirements, the hydraulic control pipeline is used to control the hydraulic switch to open the liquid inlet side holes corresponding to the oil layer to be constructed; water or polymer is injected, and the water or polymer enters the injection and production tool string through the casing annulus to reach the designated oil layer.

10. The method for using a liquid-controlled layered multi-channel injection-production string according to claim 9, characterized in that: The working process of the hydraulic control switch device is to pressurize the hydraulic control pipeline to make the guide plug move downward, and then make the piston move downward, blocking the liquid inlet side hole. When the pressure is stopped, the piston returns to its original position under the action of the spring, and the liquid inlet side hole is connected.

11. The method for using a liquid-controlled layered multi-channel injection-production string according to claim 9, characterized in that: The oil production string can be formed by connecting an oil pump that is suitable for the well depth and reservoir characteristics to the oil pipe above the upper hydraulic control switch device. The opening and closing degree of the liquid outlet side holes is controlled by the hydraulic control pipeline to achieve the regulation of the production volume of each oil layer.

12. An injection and production tool string using the liquid-controlled layered multi-channel injection and production string according to any one of claims 1 to 8, characterized in that: It includes a hydraulic control pipe string and an injection and production pipe string; the hydraulic control pipe string and the injection and production pipe string are connected through a main short joint; At least two hydraulic control units are provided in the hydraulic control pipe string; At least two injection and production units are provided in the injection and production pipe string; The number of injection and production units is the same as that of liquid control units; The injection and production unit includes closely connected short sections.

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