Multi-section fracturing tubular column structure of oil field horizontal well

Abstract

The multi-section fracturing tubular column structure comprises an oil outlet pipe located in a horizontal well, and a partition mechanism, a fracturing mechanism and a communicating pipe are sequentially arranged in the oil outlet pipe; the partition mechanism comprises a partition block, a first magnetic attraction piece is fixed to the side, facing the fracturing mechanism, of the partition block, a sealing ring is fixed to the outer side of the partition block, and a stabilizing assembly is arranged in the partition block. The fracturing mechanism comprises a fracturing device fixed to the outer side of the communicating pipe, the outer side of the fracturing device communicates with a fracturing pipeline, the end, facing the partition block, of the communicating pipe communicates with a guide pipe, the outer side of the guide pipe communicates with a spray pipe, and a second magnetic attraction piece is fixed to the side, facing the partition block, of the guide pipe. The horizontal well multi-section fracturing device has the advantage that multi-section fracturing can be conveniently carried out in a horizontal well, and the problems that multi-section fracturing is not conveniently carried out on the horizontal well, the fracturing efficiency is low, and the mining cost is increased are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of geomechanics, and in particular to a multi-stage fracturing string structure for a horizontal well in an oil field. Background Art

[0002] Petroleum exploration refers to the process of using various exploration methods to understand the underground geological conditions in order to find and identify oil and gas resources, recognize the conditions of oil generation, oil storage, oil and gas migration, accumulation, and preservation, comprehensively evaluate the oil and gas prospects, determine favorable areas for oil and gas accumulation, find oil and gas storage closures, and explore the area of ​​oil and gas fields, and clarify the conditions of oil and gas strata and production capacity.

[0003] For example, a horizontal well segmented fracturing string is disclosed in China Invention Patent Publication No. (CN214697810U), which comprises a fracturing string body and a fixed adjustment device, wherein the fracturing string body comprises an oil pipeline, a plug-in fixed head, a water column ejector, a packer, a check valve, a screen tube and a guide wire plug, the plug-in fixed head is arranged at one end of the oil pipeline, the plug-in fixed head is engaged with the adapter tube, the water column ejector is arranged on the oil pipeline, the water column ejector comprises a first water column ejector and a second water column ejector, the second water column ejector is located on one side of the first water column ejector, the packer is arranged on the oil pipeline and on one side of the second water column ejector, the check valve is arranged on one side of the packer, the screen tube is arranged at the lower end of the check valve, the guide wire plug is arranged on one side of the screen tube, two groups of perforating tubes are provided on the upper and lower sides of the first water column ejector and the second water column ejector, the fixed adjustment device is arranged on the plug-in fixed head, the fixed adjustment device comprises a clamping adjustment component, the clamping adjustment component The cam is fixedly mounted on one side of the fixing plate, the fixing plate being fixedly mounted on one side of the fixing plate, the fixing plate being fixedly mounted on one side of the fixing plate and the fixing plate being fixedly mounted on the other side of the fixing plate. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a multi-stage fracturing string structure for horizontal wells in oil fields, which has the advantage of facilitating multi-stage fracturing in horizontal wells, solving the problem that it is inconvenient to perform multi-stage fracturing on horizontal wells, resulting in low fracturing efficiency and increased mining costs.

[0005] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0006] A multi-stage fracturing string structure for a horizontal well in an oil field comprises an oil flow pipe located in a horizontal wellbore, wherein a partition mechanism, a fracturing mechanism and a connecting pipe are sequentially arranged inside the oil flow pipe; the partition mechanism comprises a partition block, a first magnetic component is fixed to the side of the partition block facing the fracturing mechanism, a sealing ring is fixed to the outside of the partition block, and a stabilizing component is arranged inside the partition block; the fracturing mechanism comprises a fracturing device fixed to the outside of the connecting pipe, a fracturing pipeline is connected to the outside of the fracturing device, a guide pipe is connected to one end of the connecting pipe facing the partition block, a nozzle is connected to the outside of the guide pipe, and a second magnetic component is fixed to the side of the guide pipe facing the partition block.

[0007] Furthermore, a limiting plate is fixed to an inner side wall of the partition block, a fixing block is fixed to the side surface of the limiting plate, and a sliding rod is fixed to the lower surface of the fixing block;

[0008] The stabilizing assembly includes a motor fixed to an inner wall of the partition block, a turntable is fixed to the output shaft of the motor, a rotation groove is opened on the right side of the turntable, a slider is slidably connected to the outer side of the slide rod, a connecting rod is fixed to the left side of the slider, the other end of the connecting rod passes through and extends to the left side of the turntable, a support rod is fixed to the outer side of the connecting rod, the other end of the support rod passes through and extends to the outer side of the partition block, and is fixed to a stabilizing block.

[0009] Furthermore, there are three sliding rods, which are symmetrically distributed around the central axis of the limiting plate, and a fixing block is fixed at both ends of each sliding rod.

[0010] Furthermore, the number of the rotating grooves is equal to the number of the connecting rods, and the positions correspond one to one. The connecting rods are located inside the rotating grooves, and the width of the rotating grooves is adapted to the outer diameter of the connecting rods.

[0011] Furthermore, the number of the fracturing pipes is no less than two and is evenly distributed on the outside of the fracturing device.

[0012] Furthermore, the number of the nozzles is no less than two, and two form a group, and are symmetrically distributed around the central axis of the guide tube.

[0013] Furthermore, the length and width of the partition block are both smaller than the inner diameter of the oil outlet pipe.

[0014] Furthermore, the outer diameter of the sealing ring is equal to the inner diameter of the oil outlet pipe.

[0015] Furthermore, the inner diameter of the horizontal well is adapted to the inner diameter of the oil outlet pipe, and the right side of the horizontal well is in a closed state.

[0016] Furthermore, the first magnetic attraction member is a magnetic material, and the second magnetic attraction member is an electromagnet.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The present invention provides a multi-stage fracturing pipe string structure for horizontal wells in an oil field. The oil outlet pipe can be isolated by the cooperation of the sealing ring provided on the partition block and the oil outlet pipe, thereby facilitating multi-stage fracturing of the horizontal well. The pressure can be transmitted to the fracturing pipe by the cooperation of the fracturing device, so that the pressure is released by the fracturing pipe, causing cracks in the oil outlet pipe and the oil field body. The fracturing agent can be introduced into the guide pipe by the cooperation of the connecting pipe, so that the fracturing agent is sprayed out by the nozzle, causing more cracks to be generated in the depth of the crack, facilitating the outflow of oil. The partition block can be adsorbed by the cooperation of the first magnetic component and the second magnetic component, thereby facilitating the movement of the partition block. It can be seen that the present invention effectively solves the problem that it is inconvenient to perform multi-stage fracturing on horizontal wells, resulting in low fracturing efficiency and increased mining costs.

[0019] Furthermore, through the cooperation of the motor, the turntable can be driven to rotate, thereby driving the rotating groove to rotate. Through the rotation of the rotating groove, the connecting rod can be driven to move, thereby driving the support rod to move. Through the movement of the support rod, the stabilizing block can be driven to move, thereby fixing the partition block to avoid the position of the partition block from shifting and affecting the partition effect.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of a multi-stage fracturing string structure for a horizontal well in an oil field according to the present invention;

[0023] Figure 2 This is a schematic diagram of a partition mechanism in a multi-stage fracturing string structure for a horizontal well in an oil field according to the present invention;

[0024] Figure 3This is a partial schematic diagram of a partition mechanism in a multi-stage fracturing string structure for a horizontal well in an oil field according to the present invention;

[0025] Figure 4 This is a schematic diagram of a fracturing mechanism in a multi-stage fracturing string structure for a horizontal well in an oil field according to the present invention.

[0026] In the figure: 1 oilfield body, 2 horizontal well, 3 oil flow pipe, 4 partition mechanism, 401 partition block, 402 first magnetic member, 403 sealing ring, 404 limit plate, 405 motor, 406 turntable, 407 rotating groove, 408 connecting rod, 409 support rod, 410 stabilizing block, 5 fracturing mechanism, 501 fracturing device, 502 fracturing pipe, 503 guide pipe, 504 nozzle, 505 second magnetic member, 6 connecting pipe. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] See also Figure 1 In this embodiment, a multi-stage fracturing string structure for a horizontal well in an oil field includes an oil field body 1, a horizontal wellbore 2 is opened inside the oil field body 1, an oil flow pipe 3 is fixed on the inner side of the horizontal wellbore 2, the drill bit is taken out and the oil flow pipe 3 is extended into the horizontal wellbore 2, and proppant is injected into the oil flow pipe 3. The proppant will flow out from the other end of the oil flow pipe 3 and flow to the connection between the oil flow pipe 3 and the horizontal wellbore 2, thereby preventing the horizontal wellbore 2 from collapsing. A partition mechanism 4 is provided inside the oil flow pipe 3 to separate the fracturing positions so as to perform multi-stage fracturing. A fracturing mechanism 5 is provided inside the oil flow pipe 3 to improve the efficiency of oil production. A connecting pipe 6 is provided inside the oil flow pipe 3.

[0029] The inner diameter of the horizontal well 2 is matched with the inner diameter of the oil outlet pipe 3, and the right side of the horizontal well 2 is closed to prevent leakage during oil production.

[0030] See also Figure 2 In order to separate the fracturing positions so as to perform multi-stage fracturing, the partition mechanism 4 in this embodiment includes a partition block 401 provided inside the oil outlet pipe 3, a first magnetic member 402 is fixed to the left side of the partition block 401, and a sealing ring 403 is fixed to the outside of the partition block 401 to improve the sealing of the partition, a limiting plate 404 is fixed to the right inner wall of the partition block 401, and a stabilizing component is provided inside the partition block 401.

[0031] In this example, the length and width of the partition block 401 are both smaller than the inner diameter of the oil outlet pipe 3, and the outer diameter of the sealing ring 403 is equal to the inner diameter of the oil outlet pipe 3, which improves the sealing performance. A fixed block is fixed to the left side of the limit plate 404, and a sliding rod is fixed to the lower surface of the fixed block. There are three sliding rods, which are symmetrically distributed around the center axis of the limit plate 404. Fixed blocks are fixed at both ends of each sliding rod.

[0032] It should be noted that the stabilizing component includes a motor 405 fixed to the inner wall of the left side of the partition block 401, and the output shaft of the motor 405 is fixed with a turntable 406, and the output shaft of the motor 405 drives the turntable 406 to rotate, and a rotation groove 407 is provided on the right side of the turntable 406, and the turntable 406 drives the rotation groove 407 to rotate, and the outer side of the slide rod is slidably connected to the slider, and a connecting rod 408 is fixed to the left side of the slider, and the other end of the connecting rod 408 passes through and extends to the left side of the turntable 406, and the rotation of the rotation groove 407 drives the connecting rod 408 to move outward, and a support rod 409 is fixed to the outer side of the connecting rod 408, and the connecting rod 408 drives the support rod 409 to move, and the other end of the support rod 409 passes through and extends to the outside of the partition block 401, and is fixed with a stabilizing block 410, and the support rod 409 carries The dynamic stabilizing block 410 moves to support the partition block 401 and the oil outlet pipe 3, thereby preventing the partition block 401 from moving and fixing the partition block 401 in this position. Two support rods 409 are fixed to the outside of each connecting rod 408, and are symmetrically distributed on the left and right sides of the central axis of the stabilizing block 410. The two support rods 409 are respectively located on the left and right sides of the turntable 406. The number of rotating grooves 407 is equal to the number of connecting rods 408, and the positions correspond one to one. The connecting rod 408 is located inside the rotating groove 407, and the width of the rotating groove 407 is adapted to the outer diameter of the connecting rod 408. When the connecting rod 408 moves, it drives the slider to move, and the slider slides on the outside of the slide rod, thereby limiting and supporting the moving trajectory of the connecting rod 408, so that the connecting rod 408 maintains the specified moving trajectory.

[0033] See also Figure 3To improve the efficiency of oil production, the fracturing mechanism 5 in this embodiment includes a fracturing device 501 fixed to the outside of the connecting pipe 6. The outside of the fracturing device 501 is connected to a fracturing pipe 502. The fracturing device 501 releases pressure through the fracturing pipe 502, thereby creating cracks in the oil flow pipe 3 and the oilfield body 1. The right side of the connecting pipe 6 is connected to a guide pipe 503. The outside of the guide pipe 503 is connected to a nozzle 504. A fracturing agent is injected into the connecting pipe 6. After the fracturing agent enters the guide pipe 503, the nozzle 504 discharges the fracturing agent, allowing the fracturing agent to enter the crack, creating cracks deep in the crack to facilitate oil production. A second magnetic member 505 is fixed to the right side of the guide pipe 503. When the second magnetic member 505 is energized, it attracts the first magnetic member 402 to drive the partition block 401 to move. For example, the first magnetic member 402 is an iron sheet, and the second magnetic member 505 is an electromagnet.

[0034] In this example, the number of fracturing pipes 502 is no less than two, and they are evenly distributed on the outside of the fracturing device 501. The number of nozzles 504 is no less than two, and two are grouped together, and are symmetrically distributed around the central axis of the guide tube 503, so as to evenly fracture the inner side of the horizontal well 2.

[0035] The working principle of the above embodiment is:

[0036] (1) First, the exploration drill bit is drilled into the oil field body 1, and a horizontal well 2 is drilled inside the oil field body 1. Then, the drill bit is taken out and the oil outlet pipe 3 is extended into the horizontal well 2. Proppant is injected into the oil outlet pipe 3. The proppant will flow out from the other end of the oil outlet pipe 3 and flow to the connection between the oil outlet pipe 3 and the horizontal well 2, thereby preventing the horizontal well 2 from collapsing. At this time, the fracturing equipment is passed into the oil outlet pipe 3, and after the partition block 401 is moved to a position, the second magnetic attraction member 505 is powered off. After the second magnetic attraction member 505 is powered off, the magnetic force is lost, so that the partition block 401 and the guide pipe 503 are disconnected.

[0037] (2) After the partition block 401 is disconnected from the guide tube 503, the motor 405 is turned on, and the output shaft of the motor 405 drives the turntable 406 to rotate, and the turntable 406 drives the rotating groove 407 to rotate, and the rotation of the rotating groove 407 drives the connecting rod 408 to move outward, and the connecting rod 408 drives the supporting rod 409 to move, and the supporting rod 409 drives the stabilizing block 410 to move, thereby supporting the partition block 401 and the oil outlet pipe 3, thereby preventing the partition block 401 from moving and fixing the partition block 401 in this position. At this time, the fracturing device 501 is turned on, The fracturing device 501 releases the pressure through the fracturing pipe 502, thereby causing cracks in the oil flow pipe 3 and the oil field body 1. At this time, a fracturing agent is injected into the connecting pipe 6. After the fracturing agent enters the guide pipe 503, the nozzle 504 passes the fracturing agent out, allowing the fracturing agent to enter the crack, causing cracks to appear deep in the crack to facilitate oil production. After this stage of fracturing is completed, the second magnetic component 505 is energized to attract the first magnetic component 402 and drive the partition block 401 to move to the next fracturing position, thereby completing multi-stage fracturing.

[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] In the present invention, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can mean fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0043] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A multi-stage fracturing string structure for horizontal wells in an oil field, characterized in that: The invention comprises an oil outlet pipe (3) located in a horizontal well (2), wherein a partition mechanism (4), a fracturing mechanism (5) and a connecting pipe (6) are sequentially arranged inside the oil outlet pipe (3); the partition mechanism (4) comprises a partition block (401), a first magnetic attraction member (402) is fixed on a side of the partition block (401) facing the fracturing mechanism (5), a sealing ring (403) is fixed on the outside of the partition block (401), and a stabilizing member (401) is arranged inside the partition block (401). The fracturing mechanism (5) comprises a fracturing device (501) fixed on the outside of the connecting pipe (6); the outside of the fracturing device (501) is connected to a fracturing pipe (502); one end of the connecting pipe (6) facing the partition block (401) is connected to a guide pipe (503); the outside of the guide pipe (503) is connected to a nozzle (504); and a second magnetic attraction device (505) is fixed to the side of the guide pipe (503) facing the partition block (401).

2. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 1, characterized in that: A limiting plate (404) is fixed to an inner side wall of the partition block (401), a fixing block is fixed to the side surface of the limiting plate (404), and a sliding rod is fixed to the lower surface of the fixing block; The stabilizing assembly comprises a motor (405) fixed to an inner wall of the partition block (401); a turntable (406) is fixed to the output shaft of the motor (405); a rotation groove (407) is provided on the right side of the turntable (406); a slider is slidably connected to the outer side of the slide rod; a connecting rod (408) is fixed to the left side of the slider; the other end of the connecting rod (408) passes through and extends to the left side of the turntable (406); a support rod (409) is fixed to the outer side of the connecting rod (408); the other end of the support rod (409) passes through and extends to the outer side of the partition block (401) and is fixed to a stabilizing block (410).

3. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 2, characterized in that: The number of the sliding rods is three and they are symmetrically distributed around the center axis of the limiting plate (404), and a fixing block is fixed at both ends of each sliding rod.

4. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 2, characterized in that: The number of the rotating grooves (407) is equal to the number of the connecting rods (408), and the positions correspond one to one. The connecting rods (408) are located inside the rotating grooves (407), and the width of the rotating grooves (407) is adapted to the outer diameter of the connecting rods (408).

5. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 1, characterized in that: The number of the fracturing pipes (502) is no less than two and they are evenly distributed outside the fracturing device (501).

6. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 1, characterized in that: The number of the nozzles (504) is no less than two, and two form a group, and are symmetrically distributed around the central axis of the guide tube (503).

7. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 1, characterized in that: The length and width of the partition block (401) are both smaller than the inner diameter of the oil outlet pipe (3).

8. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 1, characterized in that: The outer diameter of the sealing ring (403) is equal to the inner diameter of the oil outlet pipe (3).

9. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 1, characterized in that: The inner diameter of the horizontal well (2) is matched with the inner diameter of the oil outlet pipe (3), and the right side of the horizontal well (2) is in a closed state.

10. The multi-stage fracturing string structure for horizontal wells in an oil field according to claim 1, characterized in that: The first magnetic attraction component (402) is made of magnetic material, and the second magnetic attraction component (505) is an electromagnet.

Images