Hydraulic control layered multi-channel injection-production pipe column, using method thereof and injection-production tool string

Abstract

The invention discloses a hydraulic control layered multi-channel injection-production pipe column and a using method thereof and an injection-production tool string, the hydraulic control layered multi-channel injection-production pipe column comprises an oil pipe, a sleeve and a suspension layered screen pipe column, the suspension layered screen pipe column is arranged in the sleeve, at least two sand filtering units are arranged in the suspension layered screen pipe column, and the hydraulic control layered multi-channel injection-production pipe column further comprises the injection-production tool string, the upper end of the injection-production tool string is connected with an oil pipe, and the injection-production tool string comprises hydraulic control units and injection-production units which are the same in number. The injection-production units are arranged below the lowest hydraulic control unit and arranged in the suspended layered screen pipe column, and one sand filtering unit corresponds to one injection-production unit. A plurality of hydraulic control switch devices, a plurality of short sections and a plurality of layered dense plugs are designed to form a plurality of channels which can enable fluid to flow in one direction and can be cut off through hydraulic pressure at any time. Compared with a traditional packer and sliding sleeve switch layered pipe column, the layered pipe column is more suitable for multi-layer oil reservoir development.

Description

Technical Field

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

[0002] At present, as old oil fields enter the late stage of exploitation, the fine development of oil reservoirs has entered the critical stage. In the stage of replenishing energy, water and polymer injection to the oil reservoir, the reservoir is stratified through a combination of pipe strings such as packers and water distributors; in the field of oil field production, the well fluid is lifted to the ground by the oil pump through the downhole stratified pipe string. However, due to structural reasons, the existing pipe string cannot inject energy or stratify the multi-layer thin layer oil reservoir, which directly affects the oil production efficiency of such oil reservoirs.

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

[0004] The prior art realizes stratified injection and production by lowering two pipe strings, which wastes underground space and has the technical problem of being prone to failure.

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

[0006] This prior art uses a constant pressure switch for starting, 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) number: CN105443092B, discloses a four-tube layered water injection process string, including casing and wellhead, wherein an upper bridge plug, a middle bridge plug and a lower bridge plug are sequentially arranged in the casing from top to bottom, wherein the upper bridge plug, the middle bridge plug and the lower bridge plug divide the inside of the casing into four sections along the axial direction, each section corresponds to a water injection layer section, and the water injection pipe is composed of a coaxial outer oil pipe, a middle oil pipe and an inner oil pipe, wherein the outer oil pipe, the middle oil pipe and the inner oil pipe divide 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 along the radial direction, wherein each layer section of the four-tube layered water injection process string has an independent water injection channel, and no water distribution device is required to be arranged underground, so that quantitative water distribution can be completed by ground operation, and the water distribution volume control is more accurate and the adjustment is more convenient, and the four-tube layered water injection process string has the advantages of simple structure, reliable operation, convenient operation and easy maintenance.

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

[0009] In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the beneficial effects produced 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-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 of using the same, and an injection and production tool string. A tool string is formed by combining a hydraulically controlled switch device, layered close-insertion, and a porous short section, and 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 layered multi-channel injection and production string comprises an oil pipe, a casing, and a suspended layered screen pipe string, wherein the suspended layered screen pipe string is arranged in the casing, wherein at least two sand filter units are arranged in the suspended layered screen pipe string, and further comprises an injection and production tool string, wherein the upper end of the injection and production tool string is connected to the oil pipe, wherein the injection and production tool string comprises the same number of hydraulically controlled units and injection and production units; wherein the injection and production unit is arranged below the lowest hydraulically controlled unit, wherein 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.

[0013] Furthermore, the suspended layered screen pipe string also includes a suspended layered packer, and the suspended packer is arranged at the top of the sand filter unit;

[0014] Specifically, a layered packer is arranged 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 layered screen pipe string includes a hanging packer, a first sealing cylinder, a first sand filter pipe, a first layered packer, a second sealing cylinder, a second sand filter pipe, a second layered packer, a third sealing cylinder, and a third sand filter pipe connected in sequence 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, a first short section, a second layered close-fitting, a second short section, a third layered close-fitting, and a third short section.

[0021] Further, the first liquid-controlled switch device comprises 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, the side wall of the first liquid inlet pipe is provided with a first liquid inlet side hole connected with 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 connected to the second liquid inlet counterbore is provided on the side wall of the second liquid inlet pipe, and the second liquid inlet pipe is provided with a second first flow passage that passes through; 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 arranged at the lower end of the third liquid inlet pipe, a third liquid inlet side hole connected to the third liquid inlet countersunk hole is arranged on the side wall of the third liquid inlet pipe, 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, the spring is fixed on the spring sleeve, and the piston is pushed up 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 connected with the first liquid inlet side hole or 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-insertion includes a first base tube, in which a fifth flow passage No. 1, a fifth flow passage No. 2, and a fifth flow passage No. 3 are arranged; 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 passage No. 2, and a sixth flow passage No. 1, and 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;

[0033] Specifically, the second layered close-insertion includes a second base tube, a seventh flow passage No. 1 and a seventh flow passage No. 2 are arranged 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 passage 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 arranged 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 pipeline 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 and 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] Further, the two parts connected by the connection kit are called the upper part to be connected and the lower part to be connected;

[0046] Specifically, the pipeline 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 through 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 clamped under 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 arranged between the upper short section and the lower base pipe.

[0051] Specifically, the short section and the base pipe connected by the lower connecting piece 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 joint connecting sleeve, and a short joint ferrule; the short joint ferrule is threadedly connected to the outer wall of the upper end of the lower short joint, the lower end of the short joint connecting sleeve is provided with an inner cylindrical step clamped under the short joint ferrule, and the upper end is threadedly connected to the outer wall of the upper base pipe, and the third porous sealing gasket is arranged between the lower short joint 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 column comprises the following steps:

[0056] S1. Arrange the suspended layered screen pipe 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 pipe string into the well, one sand filter unit corresponds to one reservoir development layer, and the suspension and release are completed.

[0057] S2. Prepare an injection-production tool string, set the same number of hydraulic control units and injection-production units as the 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 total nipple to connect the lower end of the hydraulic control pipe string with the upper end of the injection-production pipe string, and connect all the hydraulic control pipelines to the pressure transmission holes of each hydraulic control unit respectively;

[0058] S3, lowering 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, control the on / off of the liquid inlet side holes through the hydraulic control pipeline, use the hydraulic control pipeline to control the hydraulic switch according to the construction requirements, open the liquid inlet side holes corresponding to the oil layer to be constructed; inject water or polymer, 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, so that the liquid inlet side hole is conductive.

[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 side holes for liquid outlet is controlled by hydraulic control pipelines to achieve 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 tube string and an injection and production tube string; the hydraulically controlled tube string is connected to the injection and production tube string via a total short section; at least two hydraulically controlled units are arranged in the hydraulically controlled tool; at least two injection and production units are arranged in the injection and production tube 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 lower end of the Nth liquid inlet pipe in the Nth liquid-controlled switch device is provided with an Nth liquid inlet counterbore, the side wall is provided with an Nth liquid inlet side hole connected with the Nth liquid inlet counterbore, the interior is provided with an Nth flow passage No. N-1, Nth flow passage No. N-1, ..., Nth flow passage No. 1, and 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 is closed at the upper end, the lower end is provided with a first liquid inlet counterbore, the side wall is provided with a first liquid inlet side hole connected with the first liquid inlet counterbore, and a first liquid inlet control device is 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 covered with a first sealing device; the first liquid outlet counterbore is provided in the first short section, 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 covered with a third sealing device; the Nth liquid outlet is provided in the Nth short section.

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

[0070] Specifically, the Nth liquid inlet pipe is connected to the main short section through a pipeline 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 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 overlap; ...; make the Nth liquid inlet counterbore, 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. The present invention designs multiple hydraulically controlled switch devices, multiple short sections, and multiple layered close-insertion, forming multiple channels that can allow fluid to flow in one direction and can be hydraulically cut off at any time. Compared with the traditional packer with sliding sleeve switch layered string, the present invention is more suitable for multi-layer reservoir development.

[0075] 2. Compared with the traditional underground stratified mining process, the layered pipe strings of the present invention are closely inserted and isolated between layers, and the pipes are mechanically hard-separated, so the underground stratification is highly reliable and the later maintenance is simple;

[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 for the oil layer reservoir that needs 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 pipe string to hydraulically control the oil layer to be produced. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0080] Figure 3 It 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 It is a bottom view schematic diagram of a liquid inlet pipe of a liquid-controlled layered multi-channel injection and production string of 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 hydraulic switch device; 301. First liquid inlet pipe; 302. Hydraulic plunger; 303. Guide plug; 304. Spring sleeve; 305. Piston; 306. Spring; 307. Connecting sleeve; 308. Multi-porous sealing pad; 309. Positioning pin; 310. Card 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 flow channel No. 1; 412. Second liquid inlet counterbore; 414. Second liquid inlet side hole;

[0086] 5. Lower liquid control switch device; 501. Third liquid inlet pipe; 511. Third flow channel No. 1; 512. Third flow 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, total short section; 712, first short section; 713, second short section; 714, third short section; 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, close-fitting connection sleeve; 902, close-fitting card sleeve; 903, third base tube; 904, adjusting sleeve; 905, sealing assembly; 906, spacer ring; 907, positioning sleeve; 908, third porous sealing gasket; 909, second positioning pin; 911, first layer close-fitting; 912, second layer close-fitting; 913, third layer close-fitting;

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

[0092] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0093] Embodiment 1:

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

[0095] The suspended layered screen pipe string includes a suspended packer 6, a sand filter unit, and a layered packer. At least two sand filter units are arranged below the suspended packer 6, and a layered packer is arranged between every two sand filter units. The sand filter unit includes a sealing cylinder and a sand filter pipe 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 number of the hydraulic control units is consistent with that of the injection and production 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 hydraulic 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 hydraulic 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 hydraulic control unit corresponds to the second injection and production unit, the second hydraulic control unit corresponds to the third injection and production unit, and the third hydraulic control unit corresponds to the first injection and production unit.

[0099] The hanging layered screen pipe string includes a hanging packer 6, a first sealing cylinder 811, a first sand filter tube 1011, a first layered packer 601, a second sealing cylinder 812, a second sand filter tube 1012, a second layered packer 602, a third sealing cylinder 813, and a third sand filter tube 1013 connected in sequence from top to bottom;

[0100] The injection and production tool string includes, from top to bottom, a first hydraulically controlled switch device 3, a second hydraulically controlled switch device 4, a third hydraulically controlled switch device 5, a total short section 711, a first layered close-fitting insert 811, a first short section 712, a second layered close-fitting insert 912, a second short section 713, a third layered close-fitting insert 913, and a 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 which is closed and the lower end is provided with a first liquid inlet counterbore 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 counterbore 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 counterbore 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 counterbore 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 counterbore 513 is arranged at the lower end of the third liquid inlet pipe 501, a third liquid inlet side hole 514 connected to the third liquid inlet counterbore 513 is arranged on the side wall of the third liquid inlet pipe 501, 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 is provided with an annular piston seat, and a pressure transmission hole and a guide hole are provided in the annular piston seat; 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 limit 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 pipeline 201; the second pressure transmission hole of the second liquid inlet control device is connected to the second hydraulic control pipeline 202; the third pressure transmission hole of the third liquid inlet control device is connected to the third hydraulic control pipeline 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, and the first guide plug is moved downward by pressing the first hydraulic control pipeline 201, thereby moving the first piston downward to block the first liquid inlet side hole 315, and stopping pressing. Under the action of the first spring, the first piston is reset, 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, and the two connected liquid inlet pipes are called an upper part to be connected and a 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 plug-connected by the first positioning pin 309, the porous sealing gasket 308 is arranged between the two parts to be connected, the porous sealing gasket 308 is opened 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, the lower end of the connecting sleeve 307 is provided with an inner cylindrical step clamped under 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-insertion 911 comprises a first base tube, in which a fifth flow passage No. 1, a fifth flow passage No. 2, and a fifth flow passage No. 3 are arranged; 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-insertion 912 comprises a second base tube, in which a seventh flow passage No. 1 and a seventh flow passage No. 2 are arranged; 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 second flow passage 708, and 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 913 comprises a third base tube 903, wherein a ninth second flow passage is arranged in the third base tube 903; 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 tube or the second base tube or the third base tube 903, the positioning sleeve 907 is threadedly connected to the outer wall of the first base tube or the second base tube or the third base tube 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] Connecting the short section 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 short section 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 short section;

[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, 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, the lower end of the close-insertion connecting sleeve 901 is provided with an inner cylindrical step which is clamped under the close-insertion ferrule 902, and the upper end is threadedly connected to the outer wall of the upper short section, and 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, 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, the lower end of the short section connecting sleeve is provided with an inner cylindrical step which is clamped 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 and production tool string is connected, 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, and the second liquid outlet sink hole 707 overlap, so that the first liquid inlet side hole 315 is connected with the second liquid outlet side hole 7071;

[0122] The second liquid inlet sink hole 412, the third flow channel No. 2 512, the fourth flow channel No. 2 703, the fifth flow channel No. 2, the sixth flow channel No. 2 704, the seventh flow channel No. 2, the eighth flow channel No. 2 708, the ninth flow channel No. 2, and the third liquid outlet hole 709 overlap, so that the second liquid inlet side hole 414 is connected to the third liquid outlet hole 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] Embodiment 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 pipe 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 6 on the top. After assembly, lower the suspended layered screen pipe string into the well, one sand filter unit corresponds to one reservoir development layer, and the suspension and release are completed;

[0127] S2. Prepare an injection-production tool string, set the same number of hydraulic control units and injection-production units as the 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 total nipple to connect the lower end of the hydraulic control pipe string with the upper end of the injection-production pipe string, and connect all the hydraulic control pipelines to the pressure transmission holes of each hydraulic control unit respectively;

[0128] S3, lowering 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 hole through the hydraulic control pipeline, and open the liquid inlet side hole corresponding to the oil layer to be constructed according to the construction requirements;

[0130] Taking the oil reservoir divided into three layers 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 from the first liquid inlet side hole 315, reaches the second liquid outlet side hole 7071, and enters the second oil layer through the second sand filter pipe 1012.

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

[0132] Embodiment 3:

[0133] The present embodiment provides an injection and production tool string in which the hydraulic control units and the injection and production units can correspond to each other in order, an injection and production tool string for a hydraulically controlled layered multi-channel injection and production pipe column, comprising 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 total short section; at least two hydraulic control units are arranged in the hydraulic control tool; at least two injection and production units are arranged 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; 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, the side wall is provided with an Nth liquid inlet side hole connected with the Nth liquid inlet counterbore, the interior is provided with an Nth flow passage No. N-1, an Nth flow passage No. N-1, ..., an Nth flow passage No. 1, 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 closed at the upper end, is provided with a first liquid inlet counterbore at the lower end, is provided with a first liquid inlet side hole connected to the first liquid inlet counterbore on the side wall, and is provided with a first liquid inlet control device 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-insertion is provided with a 1+N+1 flow channel No. 1, a 1+N+1 flow channel No. 2, ..., a 1+N+N flow channel No. N; the first base tube is sleeved with a first sealing device on its outer wall; 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, ..., a 1+N+N flow channel No. N;

[0140] ……;

[0141] The Nth base tube with Nth layers and close insertion is provided with the Nth flow passage No. 1+N+N; the outer wall of the third base tube is sleeved with the third sealing device; the Nth liquid outlet is provided in the Nth short section.

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

[0143] Specifically, the Nth liquid inlet pipe is connected to the main short section through a pipeline 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 counterbore, the 1+Nth flow channel N, ..., the 1+N+Nth flow channel N, and the Nth liquid outlet hole overlap.

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

[0149] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0150] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “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 orientation, and therefore, cannot be understood as a limitation on the present invention.

[0151] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0152] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulically controlled layered multi-channel injection and production string, comprising an oil pipe, a casing, and a suspended layered screen pipe string, wherein the suspended layered screen pipe string is arranged in the casing, and at least two sand filter units are arranged in the suspended layered screen pipe 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 column, and one sand filter unit corresponds to one injection and production unit.

2. A hydraulically controlled layered multi-channel injection and production string according to claim 1, characterized in that: The suspended layered screen pipe string also includes a suspended packer layered packer, and 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 filtering unit comprises a sealing cylinder and a sand filtering 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. A hydraulically controlled layered multi-channel injection and production string according to claim 2, characterized in that: The sand filtering units are provided in three pieces, the injection and production units are provided in three pieces, and the liquid control units are provided in three pieces; The hanging layered screen pipe string comprises a hanging packer, a first sealing cylinder, a first sand filter pipe, a first layered packer, a second sealing cylinder, a second sand filter pipe, a second layered packer, a third sealing cylinder, and a third sand filter pipe which are sequentially connected from top to bottom; 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, a first short section, a second layered close-fitting, a second short section, a third layered close-fitting, and a third short section.

4. A hydraulically controlled layered multi-channel injection and production string according to claim 3, characterized in that: The first liquid-controlled switch device comprises 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, the side wall of the first liquid inlet pipe is provided with a first liquid inlet side hole connected with 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 comprises 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 connected to the second liquid inlet counterbore is provided on the side wall of the second liquid inlet pipe, and a second first flow passage is provided through the second liquid inlet pipe; the second liquid inlet pipe is provided with a second liquid inlet control device above the second liquid inlet side hole; The third liquid-controlled switch device includes a third liquid inlet pipe, a third liquid inlet countersunk hole is arranged at the lower end of the third liquid inlet pipe, a third liquid inlet side hole connected to the third liquid inlet countersunk hole is arranged on the side wall of the third liquid inlet pipe, 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; the third liquid inlet pipe is provided with a third liquid inlet control device above the third liquid inlet side hole.

5. A hydraulically controlled layered multi-channel injection and production string according to claim 4, characterized in that: 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, the piston is sleeved in the spring sleeve, the spring is fixed on the spring sleeve, and the piston is pushed up so that the piston sits on the lower end surface of the annular piston seat; The inner cylindrical surface at 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 connected 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.

6. The liquid-controlled layered multi-channel injection and production string according to claim 4, characterized in that: 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-insertion comprises a first base tube, in which a fifth flow passage No. 1, a fifth flow passage No. 2, and a fifth flow passage No. 3 are arranged; and a first sealing device is sleeved on an outer wall of the first base tube; The first short section is provided with a first liquid outlet sink hole, a sixth flow passage No. 2, and a sixth flow passage No. 1, and 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-insertion comprises a second base tube, in which a seventh flow passage No. 1 and a seventh flow passage No. 2 are arranged; 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 passage No. 2, and the side wall of the second short section is provided with a second liquid outlet side hole connected with the second liquid outlet counterbore; The third layered close-insertion comprises a third base tube, in which a ninth second flow passage is arranged; 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.

7. The hydraulically controlled layered multi-channel injection and production string according to claim 6, 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 tube, the second base tube or the third base tube, the positioning sleeve is threadedly connected to the outer wall of the first base tube, the second base tube or the third base tube 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.

8. The liquid-controlled layered multi-channel injection and production string according to claim 6, 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 pipeline connection kit; The third liquid inlet pipe is connected to the main short joint through a pipeline connection kit; The short section is connected to the base pipe through the upper connecting piece and the lower connecting piece.

9. The liquid-controlled layered multi-channel injection and production string according to claim 8, characterized in that: After the injection and 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 with 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 with the first liquid outlet side hole.

10. The liquid-controlled layered multi-channel injection-production string according to claim 8, 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 pipeline 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 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.

11. The liquid-controlled layered multi-channel injection-production string according to claim 8, 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 with the upper connecting piece and the layered close insertion are called the upper short section and the lower base pipe; The upper connecting piece comprises 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 clamped under 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 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; The lower connecting piece includes a third porous sealing gasket, a short joint connecting sleeve, and a short joint ferrule; the short joint ferrule is threadedly connected to the outer wall of the upper end of the lower short joint, the lower end of the short joint connecting sleeve is provided with an inner cylindrical step clamped under the short joint ferrule, and the upper end is threadedly connected to the outer wall of the upper base pipe, and the third porous sealing gasket is arranged between the lower short joint and the upper base pipe; The short section and the base pipe are positioned by a second positioning pin.

12. A method for using a liquid-controlled layered multi-channel injection and production column, characterized in that: The following steps are included: S1. Arrange the suspended layered screen pipe string and lower the suspended layered screen pipe string so that one sand filter unit corresponds to one reservoir development layer; S2. Prepare an injection-production tool string, set the same number of hydraulic control units and injection-production units as the 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 total nipple to connect the lower end of the hydraulic control pipe string with the upper end of the injection-production pipe string, and connect all the hydraulic control pipelines to the pressure transmission holes of each hydraulic control unit respectively; S3, lowering 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, control the on / off of the liquid inlet side holes through the hydraulic control pipeline, use the hydraulic control pipeline to control the hydraulic switch according to the construction requirements, open the liquid inlet side holes corresponding to the oil layer to be constructed; inject water or polymer, water or polymer enters the injection and production tool string through the casing annulus to reach the designated oil layer.

13. A method for using a liquid-controlled layered multi-channel injection and production string according to claim 12, 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 to block the liquid inlet side hole. When the pressure is stopped, the piston is reset under the action of the spring, and the liquid inlet side hole is connected.

14. The method for using a liquid-controlled layered multi-channel injection and production string according to claim 12, characterized in that: The oil production pipe string can be formed by connecting an oil production pump 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 side holes for liquid outlet is controlled by hydraulic control pipelines to achieve regulation of the production volume of each oil layer.

15. An injection and production tool string for a hydraulically controlled layered multi-channel injection and production string, 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 total short section; At least two hydraulic control units are provided in the hydraulic control tool; At least two injection and production units are arranged in the injection and production pipe string; The number of injection and production units is consistent with that of hydraulic control units; The injection and production unit includes closely connected short sections.

16. The injection and production tool string of the hydraulically controlled layered multi-channel injection and production string according to claim 15, characterized in that: The number of the liquid control unit and the injection and production unit is N; The lower end of the Nth liquid inlet pipe in the Nth liquid-controlled switch device is provided with an Nth liquid inlet counterbore, the side wall is provided with an Nth liquid inlet side hole connected with the Nth liquid inlet counterbore, the interior is provided with an Nth flow passage No. N-1, Nth flow passage No. N-1, ..., Nth flow passage No. 1, and 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 is closed at the upper end, is provided with a first liquid inlet counterbore at the lower end, is provided with a first liquid inlet side hole connected to the first liquid inlet counterbore on the side wall, and is provided with a first liquid inlet control device above the first liquid inlet side hole; 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; The first base tube in the first layered close-insertion is provided with a 1+N+1 flow channel No. 1, a 1+N+1 flow channel No. 2, ..., a 1+N+N flow channel No. N; the first base tube is sleeved with a first sealing device on its outer wall; 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, ..., a 1+N+N flow channel No. N; ……； The Nth base tube with Nth layers and close insertion is provided with the Nth flow passage No. 1+N+N; the outer wall of the third base tube is sleeved with the third sealing device; the Nth liquid outlet is provided in the Nth short section.

17. The injection and production tool string of the hydraulically controlled layered multi-channel injection and production string according to claim 16, characterized in that: The liquid inlet pipes are connected in sequence through a pipe connection kit; The Nth liquid inlet pipe is connected to the main nipple through a pipe connection kit; The short section and the base pipe are connected through an upper connecting piece and a lower connecting piece; 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; ……； Make the Nth liquid inlet counterbore, the 1+Nth flow channel N, ..., the 1+N+Nth flow channel N, and the Nth liquid outlet hole overlap.

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