Horizontal well same-well synchronous one-injection two-production pipe column

Abstract

The horizontal well same-well synchronous one-injection and two-production pipe column comprises an oil well pump, an upper bridge type packer, an oil production bridge type working barrel, a lower bridge type packer, a hydraulic packer and a soluble bottom plug, a first center channel and a first bridge type channel which are independent of each other are arranged in the upper bridge type packer, and a first rubber barrel structure is arranged outside the upper bridge type packer. A second center channel and a second bridge type channel which are independent of each other are arranged in the oil extraction bridge type working barrel, a lateral opening which can be communicated with the second center channel and the outer portion of the oil extraction bridge type working barrel is further formed in the oil extraction bridge type working barrel, and a temporary pipe which can seal and block the lateral opening is connected to the lateral opening through a temporary shear pin. A third center channel and a third bridge type channel which are independent of each other are arranged in the lower bridge type packer, and a second rubber sleeve structure is arranged outside the lower bridge type packer. The tubular column can achieve water injection in the middle section of the horizontal well and oil extraction in the two end sections of the horizontal well, and injected water and produced liquid flowing channels do not interfere with each other.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield water injection development, and in particular to a horizontal well synchronous one-injection and two-production tubing string. Background Art

[0002] At present, the development of horizontal wells in unconventional oil reservoirs has the problems of unclear formation energy replenishment effect, difficulty in establishing an effective displacement system, large decline, and easy water breakthrough in fractures in some wells. As a new technology for oil production and water injection in the same well, the same-well injection and production is an effective means to establish lateral displacement of the wellbore. None of the existing patents can realize the same-well injection and production replenishment of water injection in the middle section of the horizontal well and oil production at both ends. The existing technology discloses a horizontal well intelligent stratified water injection and stratified oil production string (invention patent with publication number CN109751020A), which can only realize finger-end oil production by water injection at the root of the horizontal well, through casing water injection and oil production by tubing, and can only realize one injection and one production for the horizontal well. The process is difficult, there is no research and development of related key tools, and the process string has a low degree of utilization of lateral residual oil, and there is no effective solution after water breakthrough. The prior art also discloses a horizontal well throughput intelligent segmented water injection process string (utility model patent with authorization number CN205936555U), which can only realize horizontal well segmented well holding and holding. During the production process of this string, water is first injected to supplement energy, and then the well is shut down and held. The crude oil is displaced by imbibition and then the well is opened for production. However, this process string has problems such as gradually poor production effect after multiple rounds, and it is difficult to determine a reasonable holding time.

[0003] Therefore, the inventors, relying on their many years of experience and practice in related industries, have proposed a horizontal well with simultaneous injection and production of two pipe strings to overcome the defects of the existing technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a horizontal well with one injection and two production pipe strings in the same well, which can realize water injection in the middle section and oil production at both end sections of the horizontal well, and the flow channels of the injected water and the produced fluid do not interfere with each other.

[0005] The object of the present invention is achieved in this way: a horizontal well with one injection and two production pipes in the same well synchronously includes a pumping pump, an upper bridge type packer, an oil production bridge type working cylinder, a lower bridge type packer, a hydraulic packer and a soluble bottom plug connected in sequence; the upper bridge type packer has a first central channel and a first bridge type channel that are independent of each other, and the upper bridge type packer has a first rubber cylinder structure that can be sealed when pressurized in the first central channel; the oil production bridge type working cylinder has a second central channel and a second bridge type channel that are independent of each other, and the oil production bridge working cylinder is also provided with a lateral opening that can connect the second central channel and the outside of the oil production bridge working cylinder, and the lateral opening is provided. A temporary pipe that can seal and block the lateral opening is connected to the mouth of the lower bridge packer through temporary shear nails; the lower bridge packer is provided with a third central channel and a third bridge channel that are independent of each other, and the outside of the lower bridge packer is provided with a second rubber tube structure that can be sealed when pressurized in the third central channel; wherein the shearing pressure of the temporary shear nails is greater than the sealing pressure of the first rubber tube structure, the second rubber tube structure and the hydraulic packer; the two ends of the first bridge channel can be connected with the outside of the upper bridge packer and the upper end of the second bridge channel respectively, the lower end of the second bridge channel can be connected with the upper end of the third bridge channel, and the lower end of the third bridge channel can be connected with the outside of the lower bridge packer.

[0006] In a preferred embodiment of the present invention, the upper bridge type seal comprises a first diverter pipe, a first outer pipe sleeved and fixed outside the first diverter pipe, and a first rubber tube structure and a first piston sleeved on the first outer pipe; the inner cavity of the first diverter pipe constitutes a first central channel, and a gap is left between the first outer pipe and the first diverter pipe to form a first bridge type channel with a closed upper end and an open lower end, a lateral water injection hole is provided on the first outer pipe and above the first rubber tube structure, and the lateral water injection hole is connected to the first bridge channel and the outside of the upper bridge seal; the outer wall of the first outer pipe has a first limiting portion, and the first The upper end of the rubber cylinder structure can abut against the first limiting portion, and the upper end of the first piston can abut against the lower end of the first rubber cylinder structure. The first piston is connected to the first outer tube through a first sealing shear pin; a first sealing cavity is formed between the first piston and the first outer tube, and a first liquid inlet hole is provided on the first diverter pipe. The first liquid inlet hole is connected to the first central channel and the first sealing cavity and is isolated from the first bridge channel; a first stop ring is also provided between the first piston and the first outer tube and between the first sealing cavity and the first sealing shear pin, and the first piston can be connected to the first stop ring in an axially upward unidirectional movement.

[0007] In a preferred embodiment of the present invention, a first stop portion is provided on the outer wall of the first outer tube and below the first sealing cavity, and a first unsealing retaining ring is also provided between the first outer tube and the first piston. The two ends of the first stop ring are respectively pressed against the first stop portion and the first unsealing retaining ring, and the first unsealing retaining ring is connected to the first outer tube through a first unsealing shear pin.

[0008] In a preferred embodiment of the present invention, the first outer tube includes a first upper joint, a first sealing sleeve, a first connecting sleeve, a first sealing sleeve and a first lower joint connected in sequence from top to bottom, the middle inner wall of the first upper joint is threadedly sealed with the upper outer wall of the first diversion pipe, the lower inner wall of the first upper joint is threadedly sealed with the upper outer wall of the first sealing sleeve, the lower outer wall of the first sealing sleeve is threadedly connected with the upper inner wall of the first connecting sleeve, the lower outer wall of the first connecting sleeve is threadedly connected with the upper inner wall of the first sealing sleeve, and the lower outer wall of the first sealing sleeve is threadedly connected with the upper inner wall of the first lower joint; the inner cavity diameters of the first sealing sleeve, the first connecting sleeve, the first sealing sleeve and the first lower joint are similar in diameter. The same, and there is a gap between the inner walls of the four and the outer wall of the first diversion pipe to form a first bridge channel; a first limit stop ring is also threadedly connected to the outside of the first sealing sleeve, and a gap is left between the first limit stop ring and the lower end of the first upper joint. The lateral water injection hole is opened on the first sealing sleeve and arranged corresponding to the gap, and the lower end of the first limit stop ring constitutes a first limiting part; the first stop ring and the first unsealing stop ring are both sleeved on the first seating sleeve, and the first unsealing stop ring is connected to the first seating sleeve through the first unsealing shear pin; a first shear stop ring is threadedly sleeved on the lower part of the first seating sleeve and between the first unsealing stop ring and the first lower joint, and the lower end of the first piston is connected to the first shear stop ring through the first seating shear pin.

[0009] In a preferred embodiment of the present invention, the first piston includes a first upper piston tube, a first lower piston tube and a first locking sleeve which are arranged in sequence, and the upper inner wall of the first upper piston tube is provided with a first upper convex ring protruding inwardly, and the inner wall of the first upper convex ring can be in sealing contact with the outer wall of the first sealing sleeve; the lower inner wall of the first upper piston tube is threadedly connected to the upper outer wall of the first lower piston tube, and the upper inner wall of the first lower piston tube is provided with a first lower convex ring protruding inwardly, and the inner wall of the first lower convex ring can be in sealing contact with the outer wall of the first connecting sleeve; a first upper ring cavity is formed between the middle inner wall of the first upper piston tube and the outer wall of the first outer tube, and the upper outer wall of the first connecting sleeve is provided with a first annular upper flange protruding outwardly, the first upper flange is located in the first upper ring cavity, and the outer wall of the first upper flange can be in sealing contact with the inner wall of the first upper piston tube. The cam is in contact with the piston rod, and a first upper sealing cavity is formed between the upper end surface of the first upper flange and the lower end surface of the first upper convex ring; the upper outer wall of the first seating sleeve is provided with an annular first lower flange protruding outward, and the first lower flange can be in sealing contact with the inner wall of the first lower piston tube, and a first lower sealing cavity is formed between the upper end surface of the first lower flange and the lower end surface of the first lower convex ring, and the first upper sealing cavity and the first lower sealing cavity constitute the first sealing cavity; the lower end outer wall of the first lower piston tube is connected to the internal thread of the upper end of the first locking sleeve, and the lower end surface of the first lower flange constitutes a first stop portion, and the lower end of the first locking sleeve is connected to the first shear retaining ring through the first seating shear pin; a first lower ring cavity is formed between the middle inner wall of the first locking sleeve and the outer wall of the first seating sleeve, and the first stop ring and the first unsealing retaining ring are both located in the first lower ring cavity.

[0010] In a preferred embodiment of the present invention, a plurality of first upper through holes are circumferentially spaced apart on the first sealing sleeve at a position corresponding to the first upper sealing cavity, a plurality of first upper arc blocks are circumferentially spaced apart on the outer wall of the first diverter tube, each of the first upper arc blocks is provided with a first upper radial hole, and the first upper radial hole can connect the first central channel and the corresponding first upper through hole; a plurality of first lower through holes are circumferentially spaced apart on the first connecting sleeve at a position corresponding to the first lower sealing cavity, a plurality of first lower arc blocks are circumferentially spaced apart on the outer wall of the first diverter tube, each of the first lower arc blocks is provided with a first lower radial hole, and the first lower radial hole can connect the first central channel and the corresponding first lower through hole; the first upper radial hole and the first lower radial hole constitute the first liquid inlet hole.

[0011] In a preferred embodiment of the present invention, the oil production bridge working cylinder includes a second diversion pipe and a second outer pipe spaced apart outside the second diversion pipe, the inner cavity of the second diversion pipe constitutes a second central channel, and the interval between the second outer pipe and the second diversion pipe constitutes a second bridge channel open at both ends; a plurality of second through holes are circumferentially spaced apart on the second outer pipe, and a plurality of second arc blocks are circumferentially spaced apart on the outer wall of the second diversion pipe, each second arc block is provided with a second radial hole, the second radial hole can connect the second central channel and the corresponding second through hole, and the second radial hole and the corresponding second through hole constitute a lateral opening; the temporary pipe is connected to the second outer pipe by a temporary shear nail, and can seal and block each second through hole; the lower end of the first outer pipe and the upper end of the second outer pipe are connected by a first outer oil pipe, and the lower end of the first diversion pipe and the upper end of the second diversion pipe are connected by a first inner oil pipe, and the first oil pipe annulus formed between the first outer oil pipe and the first inner oil pipe can be connected to both the first bridge channel and the second bridge channel.

[0012] In a preferred embodiment of the present invention, the second diverter tube includes a first inner tube sealing tube and a diverter inner tube, the lower end inner wall of the first inner tube sealing tube is threadedly sealed with the upper end outer wall of the diverter inner tube, the first inner oil tube can be sealedly inserted in the first inner tube sealing tube and rest against the upper end surface of the diverter inner tube; the second arc block is formed on the diverter inner tube.

[0013] In a preferred embodiment of the present invention, the second outer tube includes a second upper joint, a diversion outer tube and a second lower joint arranged in sequence, the lower end inner wall of the second upper joint is threadedly sealed with the upper end outer wall of the diversion outer tube, the diversion outer tube is welded and fixed to each second arc block, and the lower end outer wall of the diversion outer tube is threadedly sealed with the upper end inner wall of the second lower joint; a gap is left between the inner walls of the second upper joint, the diversion outer tube and the second lower joint and the outer wall of the diversion inner tube to form a second bridge channel, a second through hole is opened on the diversion outer tube, a temporary pipe sleeve is arranged outside the diversion outer tube, and its upper end is in sealing contact with the outer wall of the second upper joint and is connected to the second upper joint through temporary shear nails, and its lower end is in sealing contact with the diversion outer tube and is located below the second through hole.

[0014] In a preferred embodiment of the present invention, the lower bridge seal includes a third diverter tube, a third outer tube sleeved and fixed outside the third diverter tube, and a second rubber tube structure and a second piston sleeved on the third outer tube; the inner cavity of the third diverter tube constitutes a third central channel, and a gap is left between the third outer tube and the third diverter tube to form a third bridge channel with an open upper end and a closed lower end, and a lateral water outlet hole is provided on the third outer tube and near the lower end of the third bridge channel, and the lateral water outlet hole is connected to the third bridge channel; the outer wall of the third outer tube has a second limiting part, the upper end of the second rubber tube structure can abut against the second limiting part, the upper end of the second piston can abut against the lower end of the second rubber tube structure, and the second piston is connected to the third bridge channel through the second sealing shear pin. The third outer tube is connected; a second sealed chamber is formed between the second piston and the third outer tube, and a second liquid inlet hole is opened on the third diverter tube, the second liquid inlet hole is connected with the third central channel and the second sealed chamber and is isolated from the third bridge channel; a second stop ring is also provided between the second piston and the third outer tube and between the second sealing chamber and the second sealing shear pin, and the second piston can be connected to the second stop ring in an axially upward unidirectional movement; the lower end of the second outer tube and the upper end of the third outer tube are connected by a second outer oil pipe, and the lower end of the second diverter tube and the upper end of the third diverter tube are connected by a second inner oil pipe, and the second oil pipe annulus formed between the second outer oil pipe and the second inner oil pipe can be connected with both the second bridge channel and the third bridge channel.

[0015] In a preferred embodiment of the present invention, a second stop portion is provided on the outer wall of the third outer tube and below the second sealing cavity, and a second unsealing retaining ring is also provided between the third outer tube and the second piston. The two ends of the second stop ring are respectively pressed against the second stop portion and the second unsealing retaining ring, and the second unsealing retaining ring is connected to the third outer tube through a second unsealing shear pin.

[0016] In a preferred embodiment of the present invention, the upper outer wall of the third diverter tube is threadedly sealed with the lower inner wall of the second inner tube sealing cylinder, and the second inner oil pipe can be sealed and inserted into the second inner tube sealing cylinder and rest against the upper end surface of the third diverter tube.

[0017] In a preferred embodiment of the present invention, the third outer pipe includes a third upper joint, a second sealing sleeve, a second connecting sleeve, a second sealing sleeve, a water injection screen and a third lower joint connected in sequence from top to bottom, the upper inner wall of the third upper joint is threadedly connected to the second outer oil pipe, the lower inner wall of the third upper joint is threadedly sealed with the upper outer wall of the second sealing sleeve, the lower outer wall of the second sealing sleeve is threadedly connected to the upper inner wall of the second connecting sleeve, the lower outer wall of the second connecting sleeve is threadedly connected to the upper inner wall of the second sealing sleeve, the lower outer wall of the second sealing sleeve is threadedly connected to the upper inner wall of the water injection screen, the lower inner wall of the water injection screen is threadedly connected to the upper outer wall of the third lower joint, and the upper inner wall of the third lower joint is threadedly connected to the lower outer wall of the third diversion pipe. The wall is threaded and sealed; a gap is left between the inner wall of the third upper joint, the second sealing sleeve, the second connecting sleeve, the second sealing sleeve and the water injection screen pipe and the outer wall of the third diversion pipe to form a third bridge channel; a second limit ring is also threadedly connected to the lower end position of the third upper joint close to the outside of the second sealing sleeve, the lower end of the second limit ring constitutes a second limiting part, and the screen hole of the water injection screen pipe constitutes a lateral water outlet hole; the second stop ring and the second unsealing ring are both sleeved on the second sealing sleeve, and the second unsealing ring is connected to the second sealing sleeve by a second unsealing shear pin; a second shear ring is threadedly sleeved on the lower part of the second sealing sleeve and between the second unsealing ring and the water injection screen pipe, and the lower end of the second piston is connected to the second shear ring by a second sealing pin.

[0018] In a preferred embodiment of the present invention, the second piston includes a second upper piston tube, a second lower piston tube and a second locking sleeve arranged in sequence, the upper inner wall of the second upper piston tube is provided with a second upper raised ring protruding inward, and the inner wall of the second upper raised ring can be in sealing contact with the outer wall of the second sealing sleeve; the lower inner wall of the second upper piston tube is threadedly connected to the upper outer wall of the second lower piston tube, and the upper inner wall of the second lower piston tube is provided with a second lower raised ring protruding inward, and the inner wall of the second lower raised ring can be in sealing contact with the outer wall of the second connecting sleeve; a second upper ring cavity is formed between the middle inner wall of the second upper piston tube and the outer wall of the third outer tube, and the upper outer wall of the second connecting sleeve is provided with an annular second upper flange protruding outward, the second upper flange is located in the second upper ring cavity, and the outer wall of the second upper flange can be in sealing contact with the inner wall of the second upper piston tube. The second lower sealing chamber is formed between the upper end surface of the second upper flange and the lower end surface of the second upper convex ring; the upper outer wall of the first seating sleeve is provided with an annular second lower flange protruding outward, and the second lower flange can be in sealing contact with the inner wall of the second lower piston tube, and a second lower sealing chamber is formed between the upper end surface of the second lower flange and the lower end surface of the second lower convex ring, and the second upper sealing chamber and the second lower sealing chamber constitute the second sealing chamber; the lower end outer wall of the second lower piston tube is connected to the internal thread of the upper end of the second locking sleeve, and the lower end surface of the second lower flange constitutes a second stop portion, and the lower end of the second locking sleeve is connected to the second shear retaining ring through the second seating shear pin; a second lower ring chamber is formed between the middle inner wall of the second locking ring sleeve and the outer wall of the second seating sleeve, and the second stop ring and the second unsealing retaining ring are both located in the second lower ring chamber.

[0019] In a preferred embodiment of the present invention, a plurality of third upper through holes are circumferentially spaced apart at positions corresponding to the second upper sealing cavity on the second sealing sleeve, a plurality of third upper arc blocks are circumferentially spaced apart on the outer wall of the third manifold, each of the third upper arc blocks is provided with a third upper radial hole, and the third upper radial hole can connect the third central channel and the corresponding third upper through hole; a plurality of third lower through holes are circumferentially spaced apart at positions corresponding to the second lower sealing cavity on the second connecting sleeve, a plurality of third lower arc blocks are circumferentially spaced apart on the outer wall of the third manifold, each of the third lower arc blocks is provided with a third lower radial hole, and the third lower radial hole can connect the third central channel and the corresponding third lower through hole; the third upper radial hole and the third lower radial hole constitute the second liquid inlet.

[0020] In a preferred embodiment of the present invention, the portion of the first outer tube located above the first rubber cylinder structure and the portion of the third outer tube located above the second rubber cylinder structure are both made of non-metallic drillable material.

[0021] In a preferred embodiment of the present invention, a first safety release joint is connected above the upper bridge packer, a second safety release joint is connected above the lower bridge packer, and a third safety release joint is connected above the hydraulic packer.

[0022] In a preferred embodiment of the present invention, an oil production screen and a wire plug are sequentially connected below the soluble bottom plug.

[0023] In a preferred embodiment of the present invention, a cannula hanger is further connected between the oil well pump and the upper bridge packer, and the lower end of the oil well pump can be sealably inserted into the cannula hanger.

[0024] In a preferred embodiment of the present invention, a first soluble centralizer is connected above or below the upper bridge packer, a second soluble centralizer is connected above or below the lower bridge packer, and a third soluble centralizer is connected below the hydraulic packer.

[0025] As described above, in the tubing string of the present application, the upper bridge-type packer, the oil production bridge-type mandrel, and the lower bridge-type packer all have independent central channels and bridge-type channels, which can achieve the purpose of injection and production of injected water and produced fluid through their own independent flow channels. Through the coordination of various components, the entire tubing string can effectively solve the problem of interference between injected water and produced fluid during the process of synchronous injection and production of horizontal wells, which exists in the middle injection and production at both ends. It realizes the synchronous injection and production of horizontal wells in the middle section of the horizontal well and the production of oil at both ends, further broadening the applicability of the synchronous injection and production process of horizontal wells. It is simple in design and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0027] in:

[0028] Figure 1 : A schematic structural diagram of a horizontal well synchronous one injection and two production string provided by the present invention.

[0029] Figure 2 : A cross-sectional view of the upper bridge type packer provided by the present invention.

[0030] Figure 3 :for Figure 2 A magnified view of part of the structure.

[0031] Figure 4 : A sectional view of an oil production bridge type working cylinder provided by the present invention.

[0032] Figure 5 : A cross-sectional view of the lower bridge packer provided by the present invention.

[0033] Figure 6 :for Figure 5 A magnified view of part of the structure.

[0034] Description of Figure Numbers:

[0035] 100. Oil pump;

[0036] 200, intubation hanger;

[0037] 300, upper bridge packer;

[0038] 301, first central channel; 302, first bridge channel;

[0039] 303, first shunt pipe; 3031, first upper arc block; 30311, first upper radial hole; 3032, first lower arc block; 30321, first lower radial hole;

[0040] 304, first outer tube; 3041, first upper joint; 3042, first sealing sleeve; 30421, first limit retaining ring; 30422, lateral water injection hole; 30423, first upper through hole; 3043, first connecting sleeve; 30431, first upper flange; 30432, first lower through hole; 3044, first setting sleeve; 30441, first stop ring; 30442, first unsealing retaining ring; 30443, first unsealing shear pin; 30444, first shear retaining ring; 30445, first lower flange; 3045, first lower joint;

[0041] 305, first rubber cartridge structure;

[0042] 306, first piston; 3061, first upper piston tube; 30611, first upper raised ring; 30612, first upper annular cavity; 30613, first upper sealing cavity; 3062, first lower piston tube; 30621, first lower raised ring; 30622, first lower sealing cavity; 3063, first locking sleeve; 30631, first lower annular cavity; 3064, first setting shear pin;

[0043] 400, oil production bridge mandrel;

[0044] 401, second central channel; 402, second bridge channel; 403, side opening; 404, temporary pipe; 4041, temporary shear nail;

[0045] 405, second shunt pipe; 4051, first inner tube sealing cylinder; 4052, shunt inner tube; 40521, second arc block; 405211, second radial hole;

[0046] 406, second outer tube; 4061, second upper joint; 4062, diversion outer tube; 40621, second through hole; 4063, second lower joint;

[0047] 500, lower bridge packer;

[0048] 501, the third central channel; 502, the third bridge channel;

[0049] 503, third shunt pipe; 5031, third upper arc block; 50311, third upper radial hole; 5032, third lower arc block; 50321, third lower radial hole; 5033, second inner tube sealing cylinder;

[0050] 504, third outer tube; 5041, third upper joint; 5042, second sealing sleeve; 50421, second limit retaining ring; 50422, third upper through hole; 5043, second connecting sleeve; 50431, second upper flange; 50432, third lower through hole; 5044, second setting sleeve; 50441, second retaining ring; 50442, second unsealing retaining ring; 50443, second unsealing shear pin; 50444, second shear retaining ring; 50445, second lower flange; 5045, water injection screen; 5046, third lower joint;

[0051] 505, second rubber cylinder structure;

[0052] 506, second piston; 5061, second upper piston tube; 50611, second upper raised ring; 50612, second upper annular cavity; 50613, second upper sealing cavity; 5062, second lower piston tube; 50621, second lower raised ring; 50622, second lower sealing cavity; 5063, second locking sleeve; 50631, second lower annular cavity; 5064, second setting shear pin;

[0053] 600, hydraulic packer;

[0054] 700, soluble bottom plug; 701, oil production screen; 702, wire plug; 703, ball seat;

[0055] 801, first soluble centralizer; 802, second soluble centralizer; 803, third soluble centralizer;

[0056] 901, first safety release connector; 902, second safety release connector; 903, third safety release connector. DETAILED DESCRIPTION

[0057] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0058] like Figures 1 to 6As shown, the present application provides a horizontal well with a synchronous injection and two-production string, comprising a pumping pump 100, an upper bridge packer 300, an oil production bridge mandrel 400, a lower bridge packer 500, a hydraulic packer 600 and a soluble bottom plug 700 connected in sequence; the upper bridge packer 300 has a first central channel 301 and a first bridge channel 302 that are independent of each other, and the upper bridge packer 300 has a first rubber tube structure 305 that can be set when pressurized in the first central channel 301; the oil production bridge mandrel 400 has a second central channel 301 and a second bridge channel 302 that are independent of each other. The oil production bridge working cylinder 400 is provided with a side opening 403 which can connect the second center channel 401 and the outside of the oil production bridge working cylinder 400, and a temporary pipe 404 which can seal the side opening 403 is connected at the side opening 403 through a temporary shear nail 4041; the lower bridge packer 500 has a third center channel 501 and a third bridge channel 502 which are independent of each other, and the outside of the lower bridge packer 500 has a second rubber cylinder structure 505 which can be sealed when pressurized in the third center channel 501.

[0059] Among them, the shear pressure of the temporary shear pin 4041 is greater than the setting pressure of the first rubber tube structure 305, the second rubber tube structure 505 and the hydraulic packer 600; the two ends of the first bridge channel 302 can be connected with the outside of the upper bridge packer 300 and the upper end of the second bridge channel 402 respectively, the lower end of the second bridge channel 402 can be connected with the upper end of the third bridge channel 502, and the lower end of the third bridge channel 502 can be connected with the outside of the lower bridge packer 500.

[0060] Specifically, the soluble bottom plug 700 can automatically dissolve after a certain period of use. The setting pressures of the upper bridge packer 300, the lower bridge packer 500 and the hydraulic packer 600 are basically close. The hydraulic packer 600 here can adopt any type of hydraulic packer. For example, the Y341 packer is used in this embodiment, and the Y453 intubation packer can also be used as needed. After the entire tubing string is lowered to the designated location, a soluble bottom plug 700 seals the bottom end of the string. Pressure is then applied to the string, with the pressure fluid flowing through the first, second, and third central passages 301, 401, and 501. Under the pressure, the first and second rubber seals 305, 505, and hydraulic packer 600 are all set against the inner wall of the casing, separating the upper production zone, the intermediate water injection zone, and the lower production zone. Specifically, the area between the first and second rubber seals 305, 505 faces the upper production zone, the area between the second rubber seal 505 and the hydraulic packer 600 faces the intermediate water injection zone, and the area below the hydraulic packer 600 faces the lower production zone. Continued pressure application continues until the pressure reaches a predetermined value, causing the temporary shear pins 4041 to shear, allowing the second central passage 401 to communicate with the casing annulus through the lateral opening 403. After a certain period of time, the soluble bottom plug 700 automatically dissolves, and the bottom end of the entire pipe string can be connected with the annulus of the oil casing.

[0061] During simultaneous injection and production, the injected water enters the casing annulus, enters the first bridge channel 302 through the upper end of the first bridge channel 302 of the upper bridge packer 300, then passes through the second bridge channel 402 of the production bridge mandrel 400 and the third central channel 501 of the lower bridge packer 500, and then enters the casing annulus through the lower end of the third central channel 501, finally entering the intermediate water injection section formation, achieving intermediate water injection. At the same time, under the action of the oil pump 100, the oil in the upper production section formation enters the second central channel 401 through the lateral opening 403 of the production bridge mandrel 400, and the oil in the lower production section formation enters the tubing string through the bottom of the tubing string, and then moves upward into the third central channel 501 and the second central channel 401 in sequence, and continues upward into the first central channel 301 together with the oil in the upper production section formation, and is finally pumped out of the wellhead, achieving oil production at both ends.

[0062] Therefore, in the tubing string of the present application, the upper bridge packer 300, the oil production bridge mandrel 400, and the lower bridge packer 500 all have independent central channels and bridge channels, which can achieve the purpose of injection and production of injected water and produced fluid through their own independent flow channels. Through the coordination of various components, the entire tubing string can effectively solve the problem of interference between injected water and produced fluid during the middle injection and two-end production process of horizontal wells, and realize the same-well synchronous injection and production of horizontal wells with water injection in the middle section and oil production at both ends, further broadening the applicability of the same-well synchronous injection and production process of horizontal wells, and has a simple design and easy operation.

[0063] Specifically, refer to Figure 2 and Figure 3 The upper bridge-type seal 300 includes a first diversion tube 303, a first outer tube 304 fixed on the outside of the first diversion tube 303, and a first rubber tube structure 305 and a first piston 306 mounted on the first outer tube 304; the inner cavity of the first diversion tube 303 constitutes a first central channel 301, and a gap is left between the first outer tube 304 and the first diversion tube 303 to form a first bridge-type channel 302 with a closed upper end and an open lower end. A lateral water injection hole 30422 is opened on the first outer tube 304 and above the first rubber tube structure 305. The lateral water injection hole 30422 is connected to the first bridge channel 302 and the outside of the upper bridge-type seal 300.

[0064] The outer wall of the first outer tube 304 has a first limiting portion, the upper end of the first rubber cylinder structure 305 can abut against the first limiting portion, the upper end of the first piston 306 can abut against the lower end of the first rubber cylinder structure 305, and the first piston 306 is connected to the first outer tube 304 through the first sealing shear pin 3064; a first sealing cavity is formed between the first piston 306 and the first outer tube 304, and a first liquid inlet hole is opened on the first diversion pipe 303. The first liquid inlet hole is connected to the first central channel 301 and the first sealing cavity and is isolated from the first bridge channel 302; a first stop ring 30441 is also provided between the first piston 306 and the first outer tube 304 and between the first sealing cavity and the first sealing shear pin 3064, and the first piston 306 can be connected to the first stop ring 30441 so as to move axially upward in one direction.

[0065] During pressure setting, the pressure fluid enters the first central channel 301 and then flows into the first sealing chamber through the first liquid inlet. When the pressure reaches a certain value, the first setting shear pin 3064 shears, the first piston 306 moves upward, and pushes the first rubber sleeve structure 305 upward to achieve setting. During simultaneous injection and production, the injection water enters the oil casing annulus through the lateral water injection hole 30422 and enters the first bridge channel 302, then continues downward through the open bottom end of the first bridge channel 302. The provision of the first stop ring 30441 effectively ensures that the first rubber sleeve structure 305 will not move backward after moving upward and setting, preventing unsealing.

[0066] In order to facilitate the subsequent unsealing of the upper bridge type seal 300, a first stop portion is provided on the outer wall of the first outer tube 304 and below the first sealing cavity, and a first unsealing retaining ring 30442 is also provided between the first outer tube 304 and the first piston 306. The two ends of the first stop ring 30441 are respectively pressed against the first stop portion and the first unsealing retaining ring 30442. The first unsealing retaining ring 30442 is connected to the first outer tube 304 through the first unsealing shear pin 30443.

[0067] When unsealing is required, the pipe column is lifted, and the first outer tube 304 and the first diversion tube 303 are pulled upward together. When the pulling reaches a certain value, the first unsealing shear pin 30443 is disconnected, and the first rubber sleeve structure 305 is unsealed.

[0068] Generally, in order to facilitate the processing and installation of the first outer tube 304, the first outer tube 304 includes a first upper joint 3041, a first sealing sleeve 3042, a first connecting sleeve 3043, a first seating sleeve 3044 and a first lower joint 3045 connected in sequence from top to bottom. The middle inner wall of the first upper joint 3041 is threadedly sealed with the upper outer wall of the first diversion pipe 303, the lower inner wall of the first upper joint 3041 is threadedly sealed with the upper outer wall of the first sealing sleeve 3042, the lower outer wall of the first sealing sleeve 3042 is threadedly connected with the upper inner wall of the first connecting sleeve 3043, the lower outer wall of the first connecting sleeve 3043 is threadedly connected with the upper inner wall of the first seating sleeve 3044, and the lower outer wall of the first seating sleeve 3044 is threadedly connected with the upper inner wall of the first lower joint 3045.

[0069] The inner diameters of the first sealing sleeve 3042, the first connecting sleeve 3043, the first setting sleeve 3044 and the first lower joint 3045 are the same, and there is a gap between the inner walls of the four and the outer wall of the first diversion pipe 303 to form a first bridge channel 302; a first limit ring 30421 is also threadedly connected to the outside of the first sealing sleeve 3042, and a gap is left between the first limit ring 30421 and the lower end of the first upper joint 3041, and a lateral water injection hole 30422 is opened on the first sealing sleeve 3042 and is set corresponding to the gap, and the first limit ring 30421 is threadedly connected to the outside of the first sealing sleeve 3042. The lower end of 0421 constitutes the first limiting portion; the first stop ring 30441 and the first unsealing retaining ring 30442 are both mounted on the first seating sleeve 3044, and the first unsealing retaining ring 30442 is connected to the first seating sleeve 3044 through the first unsealing shear pin 30443; the first shear retaining ring 30444 is threadedly mounted at the lower part of the first seating sleeve 3044 and between the first unsealing retaining ring 30442 and the first lower joint 3045, and the lower end of the first piston 306 is connected to the first shear retaining ring 30444 through the first seating shear pin 3064.

[0070] In order to facilitate the first piston 306 to push the first rubber cylinder structure 305 to achieve sealing when pressurizing, refer to Figure 2 and Figure 3The first piston 306 includes a first upper piston tube 3061, a first lower piston tube 3062 and a first locking sleeve 3063 arranged in sequence. The inner wall of the upper end of the first upper piston tube 3061 is provided with a first upper raised ring 30611 protruding inward, and the inner wall of the first upper raised ring 30611 can be in sealing contact with the outer wall of the first sealing sleeve 3042; the lower inner wall of the first upper piston tube 3061 is threadedly connected to the upper outer wall of the first lower piston tube 3062, and the inner wall of the upper end of the first lower piston tube 3062 is provided with a first lower raised ring 30621 protruding inward, and the inner wall of the first lower raised ring 30621 can be in sealing contact with the outer wall of the first connecting sleeve 3043.

[0071] A first upper annular cavity 30612 is formed between the middle inner wall of the first upper piston tube 3061 and the outer wall of the first outer tube 304. The outer wall of the upper end of the first connecting sleeve 3043 is provided with an annular first upper flange 30431 protruding outward. The first upper flange 30431 is located in the first upper annular cavity 30612, and the outer wall of the first upper flange 30431 can be in sealing contact with the inner wall of the first upper piston tube 3061. The upper end surface of the first upper flange 30431 is in sealing contact with the lower end surface of the first upper convex ring 30611. A first upper sealing chamber 30613 is formed between the end faces; a first annular lower flange 30445 is protruding outward from the upper outer wall of the first seating sleeve 3044, and the first lower flange 30445 can be in sealing contact with the inner wall of the first lower piston tube 3062, and a first lower sealing chamber 30622 is formed between the upper end face of the first lower flange 30445 and the lower end face of the first lower convex ring 30621, and the first upper sealing chamber 30613 and the first lower sealing chamber 30622 constitute a first sealing chamber.

[0072] The outer wall of the lower end of the first lower piston tube 3062 is connected to the internal thread of the upper end of the first locking sleeve 3063, the lower end surface of the first lower flange 30445 constitutes a first stop portion, and the lower end of the first locking sleeve 3063 is connected to the first shear retaining ring 30444 through the first sealing shear pin 3064; a first lower annular cavity 30631 is formed between the middle inner wall of the first locking sleeve 3063 and the outer wall of the first sealing sleeve 3044, and the first stop ring 30441 and the first unsealing retaining ring 30442 are both located in the first lower annular cavity 30631.

[0073] In order to facilitate the connection between the first liquid inlet and the first central channel 301 and the isolation from the first bridge channel 302, a plurality of first upper through holes 30423 are circumferentially spaced apart at positions corresponding to the first upper sealed cavity 30613 on the first sealing sleeve 3042, and a plurality of first upper arc blocks 3031 are circumferentially spaced apart on the outer wall of the first diverter pipe 303, each of which is provided with a first upper radial hole 30311, which can connect the first central channel 301 and the corresponding first upper through hole 30423. 0423; A plurality of first lower through holes 30432 are circumferentially spaced apart at positions corresponding to the first lower sealing cavity 30622 on the first connecting sleeve 3043, and a plurality of first lower arc blocks 3032 are circumferentially spaced apart on the outer wall of the first diversion pipe 303, each of the first lower arc blocks 3032 is provided with a first lower radial hole 30321, and the first lower radial hole 30321 can connect the first central channel 301 and the corresponding first lower through hole 30432; the first upper radial hole 30311 and the first lower radial hole 30321 constitute a first liquid inlet hole.

[0074] In a feasible embodiment, a first upper axial channel running through both ends of the first upper arc block 3031 can be opened, and a first lower axial channel running through both ends of the first lower arc block 3032 can be opened, and both the first upper axial channel and the first lower axial channel are connected to the first bridge channel 302, and the first upper axial channel is isolated from the first upper radial hole 30311, and the first lower axial channel is isolated from the first lower radial hole 30321.

[0075] Further, refer to Figure 4 The oil production bridge mandrel 400 includes a second diversion tube 405 and a second outer tube 406 that is spaced apart outside the second diversion tube 405. The inner cavity of the second diversion tube 405 constitutes a second central channel 401, and the interval between the second outer tube 406 and the second diversion tube 405 constitutes a second bridge channel 402 with both ends open; a plurality of second through holes 40621 are circumferentially spaced apart on the second outer tube 406, and a plurality of second arc blocks 40521 are circumferentially spaced apart on the outer wall of the second diversion tube 405, each of the second arc blocks 40521 is formed with a second radial hole 405211, and the second radial hole 405211 can connect the second central channel 401 and the corresponding second through hole 40621, and the second radial hole 405211 and the corresponding second through hole 40621 constitute a lateral opening 403; the temporary tube 404 is connected to the second outer tube 406 by a temporary shear nail 4041, and can seal and block each second through hole 40621.

[0076] The lower end of the first outer tube 304 and the upper end of the second outer tube 406 are connected by a first outer oil pipe, and the lower end of the first diversion tube 303 and the upper end of the second diversion tube 405 are connected by a first inner oil pipe. The first oil pipe annulus formed between the first outer oil pipe and the first inner oil pipe can be connected to both the first bridge channel 302 and the second bridge channel 402.

[0077] To facilitate processing and installation, the second diverter tube 405 includes a first inner tube sealing tube 4051 and a diverter inner tube 4052. The lower end inner wall of the first inner tube sealing tube 4051 is threadedly sealed with the upper end outer wall of the diverter inner tube 4052. The first inner oil tube can be sealed and inserted (fixed) in the first inner tube sealing tube 4051 and rest against the upper end surface of the diverter inner tube 4052; the second arc block 40521 is formed on the diverter inner tube 4052.

[0078] The second outer tube 406 includes a second upper joint 4061, a shunt outer tube 4062, and a second lower joint 4063, which are arranged in sequence. The inner wall of the lower end of the second upper joint 4061 is threadedly sealed with the outer wall of the upper end of the shunt outer tube 4062. The shunt outer tube 4062 is welded and fixed to each second arc block 40521. The outer wall of the lower end of the shunt outer tube 4062 is threadedly sealed with the inner wall of the upper end of the second lower joint 4063. There is a gap between the inner wall of the joint 4063 and the outer wall of the shunt inner tube 4052 to form a second bridge channel 402. The second through hole 40621 is opened on the shunt outer tube 4062. The temporary tube 404 is sleeved on the outside of the shunt outer tube 4062, and its upper end is in sealing contact with the outer wall of the second upper joint 4061 and is connected to the second upper joint 4061 through a temporary shear nail 4041. Its lower end is in sealing contact with the shunt outer tube 4062 and is located below the second through hole 40621.

[0079] Further, refer to Figure 5 and Figure 6 The lower bridge-type sealer 500 includes a third diversion tube 503, a third outer tube 504 fixed on the outside of the third diversion tube 503, and a second rubber tube structure 505 and a second piston 506 mounted on the third outer tube 504; the inner cavity of the third diversion tube 503 constitutes a third central channel 501, and a gap is left between the third outer tube 504 and the third diversion tube 503 to form a third bridge-type channel 502 with an open upper end and a closed lower end. A lateral water outlet is opened on the third outer tube 504 and near the lower end of the third bridge channel 502, and the lateral water outlet is connected to the third bridge channel 502.

[0080] The outer wall of the third outer tube 504 has a second limiting portion, the upper end of the second rubber cylinder structure 505 can abut against the second limiting portion, the upper end of the second rubber cylinder structure 505 can abut against the lower end of the second rubber cylinder structure 505, and the second piston 506 is connected to the third outer tube 504 through the second sealing shear pin 5064; a second sealed chamber is formed between the second piston 506 and the third outer tube 504, and a second liquid inlet hole is opened on the third manifold 503, the second liquid inlet hole is connected to the third central channel 501 and the second sealed chamber and is isolated from the third bridge channel 502; a second stop ring 50441 is also provided between the second piston 506 and the third outer tube 504 and between the second sealing chamber and the second sealing shear pin 5064, and the second piston 506 can be connected to the second stop ring 50441 by axial upward unidirectional movement.

[0081] The lower end of the second outer tube 406 is connected to the upper end of the third outer tube 504 via a second outer oil tube, and the lower end of the second diversion tube 405 is connected to the upper end of the third diversion tube 503 via a second inner oil tube. The second oil tube annulus formed between the second outer oil tube and the second inner oil tube can be connected to both the second bridge channel 402 and the third bridge channel 502.

[0082] In order to facilitate the subsequent unsealing of the lower bridge type sealer 500, a second stop portion is provided on the outer wall of the third outer tube 504 and below the second sealing cavity, and a second unsealing retaining ring 50442 is also provided between the third outer tube 504 and the second piston 506. The two ends of the second stop ring 50441 are respectively pressed against the second stop portion and the second unsealing retaining ring 50442. The second unsealing retaining ring 50442 is connected to the third outer tube 504 through a second unsealing shear pin 50443.

[0083] When unsealing is required, the pipe column is lifted, and the third outer tube 504 and the third diversion tube 503 are pulled upward together. When the pulling reaches a certain value, the second unsealing shear pin 50443 is disconnected, and the second rubber sleeve structure 505 is unsealed.

[0084] In order to facilitate the connection between the lower bridge type seal 500 and the oil production bridge type working cylinder 400, the upper end outer wall of the third diversion pipe 503 is threadedly sealed with the lower end inner wall of the second inner tube sealing cylinder 5033, and the second inner oil pipe can be sealed and inserted (fixed) in the second inner tube sealing cylinder 5033 and abut against the upper end surface of the third diversion pipe 503.

[0085] Generally, in order to facilitate the processing and installation of the third outer tube 504, the third outer tube 504 includes a third upper joint 5041, a second sealing sleeve 5042, a second connecting sleeve 5043, a second setting sleeve 5044, a water injection screen 5045 and a third lower joint 5046 connected in sequence from top to bottom. The inner wall of the upper end of the third upper joint 5041 is threadedly connected to the second outer oil pipe, the inner wall of the lower end of the third upper joint 5041 is threadedly sealed with the outer wall of the upper end of the second sealing sleeve 5042, and the second sealing sleeve The lower end outer wall of 5042 is threadedly connected to the upper end inner wall of the second connecting sleeve 5043, the lower end outer wall of the second connecting sleeve 5043 is threadedly connected to the upper end inner wall of the second seating sleeve 5044, the lower end outer wall of the second seating sleeve 5044 is threadedly connected to the upper end inner wall of the water injection screen pipe 5045, the lower end inner wall of the water injection screen pipe 5045 is threadedly connected to the upper end outer wall of the third lower joint 5046, and the upper end inner wall of the third lower joint 5046 is threadedly and sealedly connected to the lower end outer wall of the third diversion pipe 503.

[0086] A gap is left between the inner wall of the third upper joint 5041, the second sealing sleeve 5042, the second connecting sleeve 5043, the second setting sleeve 5044 and the water injection screen pipe 5045 and the outer wall of the third diversion pipe 503 to form a third bridge channel 502; a second limit ring 50421 is also threadedly connected to the lower end of the third upper joint 5041 outside the second sealing sleeve 5042, and the lower end of the second limit ring 50421 constitutes a second limit portion, and the sieve hole of the water injection screen pipe 5045 constitutes a lateral outlet. Water hole; the second stop ring 50441 and the second unsealing retaining ring 50442 are both mounted on the second seating sleeve 5044, and the second unsealing retaining ring 50442 is connected to the second seating sleeve 5044 through a second unsealing shear pin 50443; a second shear retaining ring 50444 is threadedly mounted at the lower part of the second seating sleeve 5044 and between the second unsealing retaining ring 50442 and the water injection screen 5045, and the lower end of the second piston 506 is connected to the second shear retaining ring 50444 through a second seating pin.

[0087] In order to facilitate the second piston 506 to push the second rubber cylinder structure 505 to achieve sealing when pressing, refer to Figure 5 and Figure 6 The second piston 506 includes a second upper piston tube 5061, a second lower piston tube 5062 and a second locking sleeve 5063 arranged in sequence. The inner wall of the upper end of the second upper piston tube 5061 is provided with a second upper raised ring 50611 protruding inward, and the inner wall of the second upper raised ring 50611 can be in sealing contact with the outer wall of the second sealing sleeve 5042; the lower inner wall of the second upper piston tube 5061 is threadedly connected to the upper outer wall of the second lower piston tube 5062, and the inner wall of the upper end of the second lower piston tube 5062 is provided with a second lower raised ring 50621 protruding inward, and the inner wall of the second lower raised ring 50621 can be in sealing contact with the outer wall of the second connecting sleeve 5043.

[0088] A second upper annular cavity 50612 is formed between the middle inner wall of the second upper piston tube 5061 and the outer wall of the third outer tube 504. The outer wall of the upper end of the second connecting sleeve 5043 is provided with an annular second upper flange 50431 protruding outward. The second upper flange 50431 is located in the second upper annular cavity 50612, and the outer wall of the second upper flange 50431 can be in sealing contact with the inner wall of the second upper piston tube 5061. The upper end surface of the second upper flange 50431 is in sealing contact with the lower end surface of the second upper convex ring 50611. A second upper sealing chamber 50613 is formed between the end faces; a second lower annular flange 50445 is protruding outward from the upper outer wall of the first seating sleeve 3044, and the second lower flange 50445 can be in sealing contact with the inner wall of the second lower piston tube 5062, and a second lower sealing chamber 50622 is formed between the upper end face of the second lower flange 50445 and the lower end face of the second lower convex ring 50621. The second upper sealing chamber 50613 and the second lower sealing chamber 50622 constitute a second sealing chamber.

[0089] The outer wall of the lower end of the second lower piston tube 5062 is connected to the internal thread of the upper end of the second locking sleeve 5063, the lower end face of the second lower flange 50445 constitutes a second stop portion, and the lower end of the second locking sleeve 5063 is connected to the second shear retaining ring 50444 through the second sealing shear pin 5064; a second lower annular cavity 50631 is formed between the middle inner wall of the second locking ring sleeve and the outer wall of the second sealing sleeve 5044, and the second stop ring 50441 and the second unsealing retaining ring 50442 are both located in the second lower annular cavity 50631.

[0090] In order to facilitate the connection between the second liquid inlet and the third central channel 501 and the isolation from the third bridge channel 502, a plurality of third upper through holes 50422 are circumferentially spaced apart at positions corresponding to the second upper sealed cavity 50613 on the second sealing sleeve 5042, and a plurality of third upper arc blocks 5031 are circumferentially spaced apart on the outer wall of the third manifold 503, each of which is provided with a third upper radial hole 50311, which can connect the third central channel 501 and the corresponding third upper through hole 50422. 0422; A plurality of third lower through holes 50432 are circumferentially spaced apart at positions corresponding to the second lower sealing cavity 50622 on the second connecting sleeve 5043, and a plurality of third lower arc blocks 5032 are circumferentially spaced apart on the outer wall of the third diverter 503, each of the third lower arc blocks 5032 is provided with a third lower radial hole 50321, and the third lower radial hole 50321 can connect the third central channel 501 and the corresponding third lower through hole 50432; the third upper radial hole 50311 and the third lower radial hole 50321 constitute a second liquid inlet hole.

[0091] In a feasible embodiment, a second upper axial channel running through both ends of the third upper arc block 5031 can be opened, and a second lower axial channel running through both ends of the third lower arc block 5032 can be opened, and both the second upper axial channel and the second lower axial channel are connected to the third bridge channel 502, and the second upper axial channel is isolated from the third upper radial hole 50311, and the second lower axial channel is isolated from the third lower radial hole 50321.

[0092] Furthermore, the portion of the first outer tube 304 located above the first rubber sleeve structure 305 (specifically, the first upper joint 3041 and the first retaining ring 30421) and the portion of the third outer tube 504 located above the second rubber sleeve structure 505 (specifically, the third upper joint 5041 and the second retaining ring 50421) are both made of a non-metallic, drillable material, such as a resin fiber. In this embodiment, the first upper joint 3041 and the first retaining ring 30421 are both made of 35CrMo, the second upper joint 4061 is made of 42CrMo, and the second retaining ring 50421 is made of a carbon-composite composite material.

[0093] When the pipe string cannot be successfully unsealed, drilling away the corresponding non-metallic drillable material can help the pipe string be successfully unsealed.

[0094] Reference Figure 1 Generally, a first safety release joint 901 is connected above the upper bridge packer 300, a second safety release joint 902 is connected above the lower bridge packer 500, and a third safety release joint 903 is connected above the hydraulic packer 600.

[0095] The specific structure of the safety release joint is the existing structure. When release is required or normal release operation is impossible, a certain lifting force can be applied to the pipe string to release the safety release joint. The above-mentioned non-metallic drillable material combined with each safety release joint can assist in releasing and lifting the pipe string when it cannot be successfully pulled out.

[0096] During a normal wellbore trip, the hand-release tool docks with the hydraulic packer 600. If the tool can be raised normally, the hydraulic packer 600 and the bridge packers are sequentially released. If the tool fails to release the packer, the rubber sleeve can be drilled through non-metallic drillable materials, losing its support and retracting inward, releasing the packer. After the packer is released, the well can be cleaned and operated. After the operation is completed, the tubing string is lowered into the well according to the wellbore procedure.

[0097] In order to filter the produced oil, refer to Figure 1 , an oil production screen 701 and a wire plug 702 are sequentially connected below the soluble bottom plug 700. In an optional embodiment, a ball seat 703 can be connected above the soluble bottom plug 700, and a ball is first dropped before pressure setting, and then the pressure setting is performed.

[0098] In order to facilitate the hanging of the tubing and to facilitate the maintenance of the oil pump 100 in the later stage without lifting the entire tubing, a tubing hanger 200 is connected between the oil pump 100 and the upper bridge packer 300, and the lower end of the oil pump 100 can be sealed and inserted (fixed) in the tubing hanger 200.

[0099] In order to straighten the tubing when it is lowered into the well, a first soluble straightener 801 is connected above or below the upper bridge packer 300, a second soluble straightener 802 is connected above or below the lower bridge packer 500, and a third soluble straightener 803 is connected below the hydraulic packer 600.

[0100] It should be noted that the upper and lower positions and similar expressions mentioned herein are for illustrative purposes only and do not represent the only implementation method. It is understood that a horizontal well comprises a vertical section and a horizontal section that are connected vertically. When the tubing is lowered by a workover rig, the oil well pump 100 and the tubing hanger 200 are located within the vertical section of the horizontal well, while the first safety joint and the following components are lowered and positioned within the horizontal section of the horizontal well. The threaded sealing connection between the two components mentioned above specifically refers to the components being fixed by a threaded connection, with a sealing ring sandwiched between the two components to ensure sealing.

[0101] In more detail, the construction steps of the entire pipe string are as follows:

[0102] Step 1: Assemble the wire plug 702, the production screen 701, the soluble bottom plug 700, the third soluble centralizer 803, the hydraulic packer 600, the third safety release joint 903, the second soluble centralizer 802, the lower bridge packer 500 and the second outer oil pipe into a tool string at the wellhead and lower it into the well. The second safety release joint 902 is serially connected to the second outer oil pipe. When the lower bridge packer 500 is lowered to the wellhead, the upper end of the second outer oil pipe is seated at the wellhead and the second inner oil pipe is lowered. The lower end of the second inner oil pipe is passed through the inner cavity of the second safety release joint 902 and then sealed and inserted into the second inner pipe sealing cylinder 5033 of the lower bridge packer 500 and abuts against the upper end surface of the third manifold 503. After the second inner oil pipe is lowered into place, the second inner oil pipe is lifted up a certain distance so that the upper end of the second inner oil pipe is exposed to the wellhead. The second inner oil pipe can now move up and down and rotate.

[0103] Next, the upper end of the second inner oil pipe is threadedly connected to the outer wall of the lower end of the diversion inner pipe 4052 of the oil production bridge working cylinder 400, and then the oil production bridge working cylinder 400 is moved downward so that the lower end thread of the second lower joint 4063 is aligned with the thread of the second outer oil pipe. While screwing the second lower joint 4063, the second inner oil pipe is also moved downward at the same time until the lower end of the second inner oil pipe rests against the upper end surface of the third diversion pipe 503. At this time, the threaded connection between the second lower joint 4063 and the second outer oil pipe is completed.

[0104] The first outer oil pipe is threadedly connected to the upper end of the second upper joint 4061, and the first soluble stabilizer 801 is serially connected to the first outer oil pipe. The pipe string is continued to be lowered, and the upper end of the first outer oil pipe is seated at the wellhead. Then the first inner oil pipe is lowered, and the first inner oil pipe is sealed and inserted into the first inner pipe sealing tube 4051 of the oil production bridge working cylinder 400 and rests on the upper end surface of the diversion inner pipe 4052; after the first inner oil pipe is lowered into place, the first inner oil pipe is lifted up a certain distance so that the upper end of the first inner oil pipe is exposed to the wellhead. At this time, the first inner oil pipe can move up and down and rotate.

[0105] The upper end of the first inner tubing is then threadedly connected to the lower outer wall of the first shunt tube 303 of the upper bridge packer 300. The upper bridge packer 300 is then moved downward so that the lower thread of the first lower joint 3045 aligns with the thread of the first outer tubing. As the first lower joint 3045 is screwed in, the first inner tubing is simultaneously moved downward until the lower end of the first inner tubing abuts against the upper end surface of the shunt inner tube 4052, completing the threaded connection between the first lower joint 3045 and the first outer tubing. The first release joint 901 is then connected to the upper end of the first upper joint 3041 of the upper bridge packer 300.

[0106] Continue to lower the tool string and connect the tubing. After reaching the designated location, connect the tubing hanger 200 and connect it to the upper tubing through multiple upper shear nails above the tubing hanger 200.

[0107] Step 2: After the tubing string is lowered, the tubing is pressurized and sealed, and the upper tubing is disconnected from the tubing hanger 200 .

[0108] Step 3: Finally, connect the oil pump 100 above the tubing hanger 200, lower the sucker rod, inject water into the annulus of the oil casing, and start oil production through the oil pipe.

[0109] in, Figure 1 The M in the diagram indicates the flow direction of the injected water, and the N indicates the flow direction of the produced oil.

[0110] In the above step 2, the soluble bottom plug 700 seals the bottom of the pipe string. When the ground-connected pump truck pressurizes the pipe string, the pressurizing fluid enters the first central channel 301, the first inner oil pipe, the second central channel 401, the second inner oil pipe, the third central channel 501 and the inner cavity of the hydraulic packer 600 in sequence. The pressurizing fluid entering the first central channel 301 flows into the first upper sealing chamber 30613 through the first upper radial hole 30311 and the first upper through hole 30423, and enters the first lower sealing chamber 30622 through the first lower radial hole 30321 and the first lower through hole 30432. The pressurizing fluid simultaneously pushes the first upper piston tube 3061 and the first lower piston tube 3062 upwards. When the pressure reaches a certain value, the first sealing shear pin 3064 is cut off, and the first upper piston tube 3061, the first lower piston tube 3062 and the first locking sleeve 3063 move upward together and push the first rubber cylinder structure 305 upward to achieve sealing; the pressurizing fluid entering the third central channel 501 flows into the second upper sealing chamber 50613 through the third upper radial hole 50311 and the third upper through hole 50422, and enters the second lower sealing chamber 50622 through the third lower radial hole 50321 and the third lower through hole 50432. The pressurizing fluid simultaneously pushes the second upper piston tube 5061 and the second lower piston tube 5062 upward. When the pressure reaches a certain value, the second sealing shear pin 5064 is cut off, and the second upper piston tube 5061, the second lower piston tube 5062 and the second locking sleeve 5063 move upward together and push the second rubber cylinder structure 505 upward to achieve sealing.

[0111] The setting pressures of the upper bridge packer 300, lower bridge packer 500, and hydraulic packer 600 are similar, as are the setting pressures of the tubing hanger 200. After the tubing is pressured, the tubing hanger 200, upper bridge packer 300, lower bridge packer 500, and hydraulic packer 600 are all set. The tubing hanger 200 effectively supports and suspends the entire tubing string. Each soluble centralizer stabilizes the tubing string during lowering and pressure setting, ensuring uniform sealing. A plurality of locking teeth are provided on the outer wall of each of the above-mentioned stop rings, and a plurality of inverted teeth are provided on the inner wall of the corresponding locking sleeve. These inverted teeth can cooperate with the locking teeth. When the locking sleeve moves upward, the plurality of inverted teeth of the locking sleeve will be locked with the plurality of locking teeth on the stop ring. These inverted teeth can move upward along the axial direction of the plurality of locking teeth but will not move backward, that is, the locking sleeve can move upward along the stop ring but cannot move downward along the stop ring, so as to effectively prevent the rubber cylinder structure from being unsealed.

[0112] After the pressure is continuously increased to a preset value, the temporary shear pins 4041 are sheared off, and the second central channel 401 can be connected to the casing annulus through the lateral opening 403. In addition, after the pressure reaches a certain value, the upper shear pins between the tubing hanger 200 and the upper tubing are disconnected.

[0113] After a certain period of time, the soluble bottom plug 700 automatically dissolves, and the bottom end of the entire pipe string can be connected with the oil casing annulus; each soluble centralizer will also automatically dissolve, specifically the part of the soluble centralizer that extends outside the pipe string and can rest on the casing will automatically dissolve, so as to facilitate the subsequent lifting of the pipe string.

[0114] In step three above, the outer tubular body of the oil well pump 100 is sealed and fixed in the tubing hanger 200, and then the sucker rod is lowered. During simultaneous injection and production, the injected water enters the oil casing annulus through the lateral water injection hole 30422 and enters the first bridge channel 302. It then continues downward through the bottom open end of the first bridge channel 302, enters the first tubing annulus, and then sequentially enters the second bridge channel 402, the second tubing annulus, and the third bridge channel 502. It then enters the oil casing annulus through the sieve holes on the water injection screen 5045, and finally enters the intermediate water injection section formation, achieving intermediate water injection.

[0115] At the same time, under the action of the oil pump 100, the oil in the upper oil production section enters the second central channel 401 through the lateral opening 403 of the oil production bridge working cylinder 400, and the oil in the lower oil production section enters the tubing string through the side wall holes of the oil production screen 701 at the bottom of the tubing string, and moves upward into the third central channel 501, the second inner oil pipe and the second central channel 401 in turn, and continues upward together with the oil in the upper oil production section into the first inner oil pipe and the first central channel 301, and is finally pumped out of the wellhead, realizing oil production at both ends.

[0116] Furthermore, the quasi-natural energy development of horizontal wells decreases rapidly and the risk of water breakthrough in water injection development is high. The horizontal well same-well injection and production replenishment process in this embodiment can solve the problem of insufficient energy for horizontal well development in low-permeability oil reservoirs, greatly reduce the risk of horizontal well flooding, and is an effective means to establish lateral displacement of horizontal wellbores.

[0117] There are currently no application examples of the synchronous injection and production process of horizontal wells with injection in the middle and production at both ends. The tubing in this embodiment utilizes key tools such as the oil production bridge mandrel 400 and the bridge packer to effectively solve the problem of interference between injected water and produced fluid during the synchronous injection and production process of horizontal wells, and significantly improve the utilization of the remaining oil in the horizontal well, especially in the waist, maintain the formation pressure level, and significantly increase the average formation pressure compared to water drive production. This process has the characteristics of cost reduction and efficiency improvement, measures to increase production, and environmental protection, and can significantly improve the utilization of the remaining oil in horizontal wells, especially in the waist. Horizontal well recharge can be achieved through a single trip of tubing, with high operating efficiency and lower construction costs than traditional horizontal well injection and production recharge processes. Compared with traditional recharge technologies, a long-term and effective lateral displacement system can be established, and the utilization of the remaining oil in the horizontal well, especially in the waist, can be significantly improved. Compared with traditional recharge processes, the construction time can be effectively shortened by more than 15 days.

[0118] Furthermore, downhole intelligent injectors are typically installed at the outlet of the production section and the inlet of the injection section. The lower connector of the downhole intelligent injector connects to the oil pipe. The downhole intelligent injector is designed with an injection-production manifold, which is equipped with a water nozzle. During injection and production, the electronically controlled pressure-balancing water nozzle is controlled by a motor to control the opening angle, thereby achieving liquid volume control. A pressure test assembly is installed on the flowmeter of the downhole intelligent injector.

[0119] After entering the well, the downhole intelligent injector controls the opening time according to the set injection volume of the single section through time control, and automatically adjusts according to the target flow after opening; at the same time, the water nozzle can be remotely controlled to open, and the communication with the ground adopts the form of fluid wave code. The ground establishes flow fluctuations by changing the flow in the wellbore. The downhole intelligent injector detects the flow change, parses the meaning of the instruction, and executes the corresponding action. While detecting the flow fluctuation, the pressure test component synchronously tests the wellbore pressure change, parses the pressure fluctuation instruction, and verifies the flow instruction code.

[0120] During normal production, the produced fluid from both end sections enters the tubing string through the diverter nozzle under the action of the oil pump 100, enters through the produced fluid channel (i.e., the second center channel 401) of the oil production bridge mandrel 400 and the oil production screen 701, and is pumped out of the wellhead. If a sudden influx of injected water occurs at a certain production end, causing the water content to rise too quickly, the digital communication nozzle can be used to close a certain production end to achieve single injection and single production, thereby preventing horizontal well flooding. Among them, the diverter nozzle and the digital communication nozzle both refer to nozzles installed in the downhole intelligent controller. The nozzle can control the size of the opening and thus the amount of water. When there is a risk of flooding, the nozzle can be electrically closed to prevent flooding.

[0121] The above is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention.

Claims

1. A horizontal well with simultaneous injection and production of one pipe string, characterized in that: It includes a sequentially connected oil pump, an upper bridge packer, an oil production bridge mandrel, a lower bridge packer, a hydraulic packer and a soluble bottom plug; The upper bridge-type packer has a first central channel and a first bridge-type channel that are independent of each other, and the upper bridge-type packer has a first rubber tube structure that can be sealed when the first central channel is pressurized; the oil production bridge-type working cylinder has a second central channel and a second bridge-type channel that are independent of each other, and the oil production bridge-type working cylinder is also provided with a lateral opening that can connect the second central channel and the outside of the oil production bridge-type working cylinder, and a temporary pipe that can seal and block the lateral opening is connected to the lateral opening through a temporary shear nail; the lower bridge-type packer has a third central channel and a third bridge-type channel that are independent of each other, and the lower bridge packer has a second rubber tube structure that can be sealed when the third central channel is pressurized; Among them, the shearing pressure of the temporary shear pins is greater than the setting pressure of the first rubber tube structure, the second rubber tube structure and the hydraulic packer; the two ends of the first bridge channel can be connected with the outside of the upper bridge packer and the upper end of the second bridge channel respectively, the lower end of the second bridge channel can be connected with the upper end of the third bridge channel, and the lower end of the third bridge channel can be connected with the outside of the lower bridge packer.

2. The horizontal well synchronous one injection and two production string as claimed in claim 1, characterized in that: The upper bridge packer comprises a first shunt pipe, a first outer pipe sleeved and fixed outside the first shunt pipe, and the first rubber tube structure and a first piston sleeved on the first outer pipe; the inner cavity of the first shunt pipe constitutes the first central channel, a gap is left between the first outer pipe and the first shunt pipe to constitute the first bridge channel with a closed upper end and an open lower end, a lateral water injection hole is opened on the first outer pipe and above the first rubber tube structure, and the lateral water injection hole is connected with the first bridge channel and the outside of the upper bridge packer; The outer wall of the first outer tube has a first limiting portion, the upper end of the first rubber cylinder structure can abut against the first limiting portion, the upper end of the first piston can abut against the lower end of the first rubber cylinder structure, and the first piston is connected to the first outer tube through a first sealing shear pin; a first sealing cavity is formed between the first piston and the first outer tube, and a first liquid inlet hole is provided on the first diverter pipe, the first liquid inlet hole is connected to the first central channel and the first sealing cavity and is isolated from the first bridge channel; a first stop ring is also provided between the first piston and the first outer tube and between the first sealing cavity and the first sealing shear pin, and the first piston can be connected to the first stop ring in an axially upward unidirectional manner.

3. The horizontal well synchronous one injection and two production string as claimed in claim 2, characterized in that: A first stop portion is provided on the outer wall of the first outer tube and below the first sealing cavity, and a first unsealing stop ring is also provided between the first outer tube and the first piston, two ends of the first stop ring respectively abut against the first stop portion and the first unsealing stop ring, and the first unsealing stop ring is connected to the first outer tube through a first unsealing shear pin.

4. The horizontal well synchronous one injection and two production string as claimed in claim 3, characterized in that: The first outer tube comprises a first upper joint, a first sealing sleeve, a first connecting sleeve, a first setting sleeve and a first lower joint which are connected in sequence from top to bottom, the middle inner wall of the first upper joint is threadedly sealed with the upper outer wall of the first shunt pipe, the lower inner wall of the first upper joint is threadedly sealed with the upper outer wall of the first sealing sleeve, the lower outer wall of the first sealing sleeve is threadedly connected with the upper inner wall of the first connecting sleeve, the lower outer wall of the first connecting sleeve is threadedly connected with the upper inner wall of the first setting sleeve, and the lower outer wall of the first setting sleeve is threadedly connected with the upper inner wall of the first lower joint; The inner cavity diameters of the first sealing sleeve, the first connecting sleeve, the first seating sleeve and the first lower joint are the same, and a gap is left between the inner walls of the four and the outer wall of the first shunt pipe to form the first bridge channel; a first limit stop ring is also threadedly connected to the outside of the first sealing sleeve, a gap is left between the first limit stop ring and the lower end of the first upper joint, the lateral water injection hole is opened on the first sealing sleeve and arranged corresponding to the gap, and the lower end of the first limit stop ring constitutes the first limiting portion; the first stop ring and the first unsealing stop ring are both sleeved on the first seating sleeve, and the first unsealing stop ring is connected to the first seating sleeve through the first unsealing shear pin; a first shear stop ring is threadedly sleeved at the lower part of the first seating sleeve and between the first unsealing stop ring and the first lower joint, and the lower end of the first piston is connected to the first shear stop ring through the first seating shear pin.

5. The horizontal well synchronous one injection and two production string as claimed in claim 4, characterized in that: The first piston comprises a first upper piston tube, a first lower piston tube and a first locking sleeve which are arranged in sequence, the upper inner wall of the first upper piston tube is provided with a first upper convex ring which protrudes inwards, and the inner wall of the first upper convex ring can be in sealing contact with the outer wall of the first sealing sleeve; the lower inner wall of the first upper piston tube is threadedly connected with the upper outer wall of the first lower piston tube, and the upper inner wall of the first lower piston tube is provided with a first lower convex ring which protrudes inwards, and the inner wall of the first lower convex ring can be in sealing contact with the outer wall of the first connecting sleeve; A first upper annular cavity is formed between the middle inner wall of the first upper piston tube and the outer wall of the first outer tube, an annular first upper flange is protruded outwardly from the outer wall of the upper end of the first connecting sleeve, the first upper flange is located in the first upper annular cavity, and the outer wall of the first upper flange can be in sealing contact with the inner wall of the first upper piston tube, and a first upper sealed cavity is formed between the upper end surface of the first upper flange and the lower end surface of the first upper convex ring; an annular first lower flange is protruded outwardly from the outer wall of the upper end of the first seating sleeve, the first lower flange can be in sealing contact with the inner wall of the first lower piston tube, and a first lower sealed cavity is formed between the upper end surface of the first lower flange and the lower end surface of the first lower convex ring, and the first upper sealed cavity and the first lower sealed cavity constitute the first sealed cavity; The outer wall of the lower end of the first lower piston tube is connected to the internal thread of the upper end of the first locking sleeve, the lower end surface of the first lower flange constitutes the first stop portion, and the lower end of the first locking sleeve is connected to the first shear stop ring through the first sealing shear pin; a first lower annular cavity is formed between the middle inner wall of the first locking sleeve and the outer wall of the first sealing sleeve, and the first stop ring and the first unsealing stop ring are both located in the first lower annular cavity.

6. The horizontal well synchronous one injection and two production string as claimed in claim 5, characterized in that: A plurality of first upper through holes are circumferentially spaced apart at positions corresponding to the first upper sealing cavity on the first sealing sleeve, a plurality of first upper arc blocks are circumferentially spaced apart on the outer wall of the first diverter tube, each of the first upper arc blocks is provided with a first upper radial hole, and the first upper radial hole can connect the first center channel and the corresponding first upper through hole; a plurality of first lower through holes are circumferentially spaced apart at positions corresponding to the first lower sealing cavity on the first connecting sleeve, a plurality of first lower arc blocks are circumferentially spaced apart on the outer wall of the first diverter tube, each of the first lower arc blocks is provided with a first lower radial hole, and the first lower radial hole can connect the first center channel and the corresponding first lower through hole; the first upper radial hole and the first lower radial hole constitute the first liquid inlet hole.

7. The horizontal well synchronous one injection and two production string as claimed in claim 2, characterized in that: The oil production bridge mandrel comprises a second shunt pipe and a second outer pipe sleeved outside the second shunt pipe at intervals, the inner cavity of the second shunt pipe constitutes the second central channel, and the interval between the second outer pipe and the second shunt pipe constitutes the second bridge channel with both ends open; a plurality of second through holes are circumferentially spaced on the second outer pipe, and a plurality of second arc blocks are circumferentially spaced on the outer wall of the second shunt pipe, each of the second arc blocks is provided with a second radial hole, the second radial hole can connect the second central channel and the corresponding second through hole, and the second radial hole and the corresponding second through hole constitute the lateral opening; the temporary pipe is connected to the second outer pipe by the temporary shear nails, and can seal and block each of the second through holes; The lower end of the first outer pipe is connected to the upper end of the second outer pipe via a first outer oil pipe, the lower end of the first diversion pipe is connected to the upper end of the second diversion pipe via a first inner oil pipe, and a first oil pipe annulus formed between the first outer oil pipe and the first inner oil pipe can be connected to both the first bridge channel and the second bridge channel.

8. The horizontal well synchronous one injection and two production string as claimed in claim 7, characterized in that: The second diverter tube comprises a first inner tube sealing tube and a diverter inner tube, the lower end inner wall of the first inner tube sealing tube is threadedly sealed with the upper end outer wall of the diverter inner tube, the first inner oil tube can be sealably inserted in the first inner tube sealing tube and abut against the upper end surface of the diverter inner tube; the second arc block is formed on the diverter inner tube.

9. The horizontal well synchronous one injection and two production string as claimed in claim 8, characterized in that: The second outer tube includes a second upper joint, a shunt outer tube and a second lower joint which are arranged in sequence, the lower inner wall of the second upper joint is threadedly sealed with the upper outer wall of the shunt outer tube, the shunt outer tube is welded and fixed to each of the second arc blocks, and the lower outer wall of the shunt outer tube is threadedly sealed with the upper inner wall of the second lower joint; a gap is left between the inner walls of the second upper joint, the shunt outer tube and the second lower joint and the outer wall of the shunt inner tube to form the second bridge channel, the second through hole is opened on the shunt outer tube, the temporary pipe sleeve is arranged outside the shunt outer tube, and its upper end is in sealing contact with the outer wall of the second upper joint and is connected to the second upper joint through the temporary shear nails, and its lower end is in sealing contact with the shunt outer tube and at a position below the second through hole.

10. The horizontal well synchronous one injection and two production string as claimed in claim 7, characterized in that: The lower bridge packer comprises a third shunt pipe, a third outer pipe sleeved and fixed outside the third shunt pipe, and the second rubber tube structure and the second piston sleeved on the third outer pipe; the inner cavity of the third shunt pipe constitutes the third central channel, a gap is left between the third outer pipe and the third shunt pipe to form the third bridge channel with an open upper end and a closed lower end, a lateral water outlet hole is opened on the third outer pipe and close to the lower end of the third bridge channel, and the lateral water outlet hole is connected to the third bridge channel; The outer wall of the third outer tube has a second limiting portion, the upper end of the second rubber cylinder structure can abut against the second limiting portion, the upper end of the second piston can abut against the lower end of the second rubber cylinder structure, and the second piston is connected to the third outer tube through a second sealing shear pin; a second sealing cavity is formed between the second piston and the third outer tube, a second liquid inlet hole is provided on the third diverter pipe, the second liquid inlet hole is connected to the third central channel and the second sealing cavity and is isolated from the third bridge channel; a second stop ring is also provided between the second piston and the third outer tube and between the second sealing cavity and the second sealing shear pin, and the second piston can be connected to the second stop ring in an axially upward unidirectional manner; The lower end of the second outer pipe is connected to the upper end of the third outer pipe via a second outer oil pipe, the lower end of the second branch pipe is connected to the upper end of the third branch pipe via a second inner oil pipe, and a second oil pipe annulus formed between the second outer oil pipe and the second inner oil pipe can be connected to both the second bridge channel and the third bridge channel.

11. The horizontal well synchronous one injection and two production string as claimed in claim 10, characterized in that: A second stop portion is provided on the outer wall of the third outer tube and below the second sealing cavity, and a second unsealing stop ring is also provided between the third outer tube and the second piston, two ends of the second stop ring respectively abut against the second stop portion and the second unsealing stop ring, and the second unsealing stop ring is connected to the third outer tube via a second unsealing shear pin.

12. The horizontal well synchronous one injection and two production string according to claim 11, characterized in that: The upper outer wall of the third shunt pipe is threadedly sealed with the lower inner wall of the second inner pipe sealing cylinder, and the second inner oil pipe can be sealably inserted in the second inner pipe sealing cylinder and abut against the upper end surface of the third shunt pipe.

13. The horizontal well synchronous one injection and two production string according to claim 11, characterized in that: The third outer tube comprises a third upper joint, a second sealing sleeve, a second connecting sleeve, a second setting sleeve, a water injection screen and a third lower joint which are connected in sequence from top to bottom, the upper inner wall of the third upper joint is threadedly connected to the second outer oil pipe, the lower inner wall of the third upper joint is threadedly and sealedly connected to the upper outer wall of the second sealing sleeve, the lower outer wall of the second sealing sleeve is threadedly connected to the upper inner wall of the second connecting sleeve, the lower outer wall of the second connecting sleeve is threadedly connected to the upper inner wall of the second setting sleeve, the lower outer wall of the second setting sleeve is threadedly connected to the upper inner wall of the water injection screen, the lower inner wall of the water injection screen is threadedly connected to the upper outer wall of the third lower joint, and the upper inner wall of the third lower joint is threadedly and sealedly connected to the lower outer wall of the third shunt pipe; The inner walls of the third upper joint, the second sealing sleeve, the second connecting sleeve, the second sealing sleeve and the water injection screen pipe are spaced from each other and the outer wall of the third diversion pipe form the third bridge channel; a second limit stop ring is threadedly connected to the lower end of the third upper joint close to the outside of the second sealing sleeve, the lower end of the second limit stop ring forms the second limit portion, and the screen holes of the water injection screen pipe form the lateral water outlet hole; the second stop ring and the second unsealing stop ring are both sleeved on the second sealing sleeve, and the second unsealing stop ring is connected to the second sealing sleeve through the second unsealing shear pin; a second shear stop ring is threadedly sleeved on the lower part of the second sealing sleeve and between the second unsealing stop ring and the water injection screen pipe, and the lower end of the second piston is connected to the second shear stop ring through the second sealing pin.

14. The horizontal well synchronous one injection and two production string as claimed in claim 13, characterized in that: The second piston comprises a second upper piston tube, a second lower piston tube and a second locking sleeve which are arranged in sequence, the inner wall of the upper end of the second upper piston tube is provided with a second upper convex ring which protrudes inwardly, and the inner wall of the second upper convex ring can be in sealing contact with the outer wall of the second sealing sleeve; the lower inner wall of the second upper piston tube is threadedly connected with the upper outer wall of the second lower piston tube, and the inner wall of the upper end of the second lower piston tube is provided with a second lower convex ring which protrudes inwardly, and the inner wall of the second lower convex ring can be in sealing contact with the outer wall of the second connecting sleeve; A second upper ring cavity is formed between the middle inner wall of the second upper piston tube and the outer wall of the third outer tube, an annular second upper flange is protruded outwardly on the outer wall of the upper end of the second connecting sleeve, the second upper flange is located in the second upper ring cavity, and the outer wall of the second upper flange can be in sealing contact with the inner wall of the second upper piston tube, and a second upper sealed cavity is formed between the upper end surface of the second upper flange and the lower end surface of the second upper convex ring; an annular second lower flange is protruded outwardly on the outer wall of the upper end of the first seating sleeve, the second lower flange can be in sealing contact with the inner wall of the second lower piston tube, and a second lower sealed cavity is formed between the upper end surface of the second lower flange and the lower end surface of the second lower convex ring, and the second upper sealed cavity and the second lower sealed cavity constitute the second sealed cavity; The outer wall of the lower end of the second lower piston tube is connected to the internal thread of the upper end of the second locking sleeve, the lower end surface of the second lower flange constitutes the second stop portion, and the lower end of the second locking sleeve is connected to the second shear stop ring through the second sealing shear pin; a second lower ring cavity is formed between the middle inner wall of the second locking ring sleeve and the outer wall of the second sealing sleeve, and the second stop ring and the second unsealing stop ring are both located in the second lower ring cavity.

15. The horizontal well synchronous one injection and two production string as claimed in claim 14, characterized in that: A plurality of third upper through holes are circumferentially spaced apart at positions corresponding to the second upper sealing cavity on the second sealing sleeve, a plurality of third upper arc blocks are circumferentially spaced apart at outer walls of the third diverter tube, a third upper radial hole is formed on each of the third upper arc blocks, and the third upper radial hole can connect the third central channel with the corresponding third upper through hole; a plurality of third lower through holes are circumferentially spaced apart at positions corresponding to the second lower sealing cavity on the second connecting sleeve, a plurality of third lower arc blocks are circumferentially spaced apart at outer walls of the third diverter tube, a third lower radial hole is formed on each of the third lower arc blocks, and the third lower radial hole can connect the third central channel with the corresponding third lower through hole; the third upper radial hole and the third lower radial hole constitute the second liquid inlet hole.

16. The horizontal well synchronous one injection and two production string as claimed in claim 10, characterized in that: The portion of the first outer tube located above the first rubber tube structure and the portion of the third outer tube located above the second rubber tube structure are both made of non-metallic drillable material.

17. The horizontal well synchronous one injection and two production string as claimed in claim 16, characterized in that: A first safety release joint is connected above the upper bridge packer, a second safety release joint is connected above the lower bridge packer, and a third safety release joint is connected above the hydraulic packer.

18. The horizontal well synchronous one injection and two production string as claimed in claim 1, characterized in that: An oil production screen pipe and a wire plug are sequentially connected below the soluble bottom plug.

19. The horizontal well synchronous one injection and two production string as claimed in claim 1, characterized in that: A tubing hanger is also connected between the oil pump and the upper bridge packer, and the lower end of the oil pump can be sealed and inserted in the tubing hanger.

20. The horizontal well synchronous one injection and two production string as claimed in claim 1, characterized in that: A first soluble centralizer is connected above or below the upper bridge packer, a second soluble centralizer is connected above or below the lower bridge packer, and a third soluble centralizer is connected below the hydraulic packer.

Images