Hydraulic jet staged fracturing tool for horizontal well

Abstract

The invention provides a hydraulic jet staged fracturing tool for a horizontal well, and belongs to the technical field of horizontal well fracturing tools. The multiple spraying assemblies are arranged on the peripheral wall of the oil pipe, and the spraying assemblies can be adjusted at any rotation angle around the peripheral wall of the oil pipe; a plurality of packers are fixed to the peripheral wall of the oil pipe, a hydraulic motor is fixed to the right end of the oil pipe, a rubber scraping disc is fixed to an output shaft of the hydraulic motor, and a crushing assembly is arranged on the rubber scraping disc. The device has the advantages of being capable of achieving large-scale perforation operation through a small number of jet holes and the like, and the problem that in the prior art, a device is inconvenient to conduct large-scale perforation operation is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of horizontal well fracturing tools, and in particular to a horizontal well hydraulic jet staged fracturing tool. Background Art

[0002] Hydraulic fracturing is an important technical measure for increasing the production of oil and gas wells and water injection wells. It is not only widely used in low-permeability oil and gas reservoirs, but has also achieved excellent results in the production and transformation of medium- and high-permeability oil and gas reservoirs. It uses a surface high-pressure pump group to inject a highly viscous liquid into the well at a rate that greatly exceeds the absorption capacity of the formation. The high pressure is built up at the bottom of the well. When this pressure exceeds the ground stress near the well wall and the tensile strength of the formation rock, cracks are generated in the formation near the bottom of the well. The sand-carrying fluid with proppant is further injected, and the cracks extend forward and are filled with proppant. After the well is shut in, the cracks close on the proppant, thereby forming sand-filled cracks with certain geometric dimensions and conductivity in the formation near the bottom of the well, which can achieve the purpose of increasing the production of the well. Therefore, providing practical horizontal well hydraulic jet staged fracturing tools has become a research focus for those skilled in the art.

[0003] Chinese patent application document CN111206910A discloses a horizontal well hydraulic jet segmented fracturing tool, which includes a completion string and an oil pipe. The outside of the oil pipe is fixedly installed with evenly distributed sandblasters, and the outside of the oil pipe is fixedly installed with packers located on the left and right sides of the sandblasters. The outside of the oil pipe is fixedly sleeved with a flexible fixing ring, and the outside of the flexible fixing ring is fixedly sleeved with a straightening casing. The horizontal well hydraulic jet segmented fracturing tool is fixedly installed with a straightening casing on the outside of the oil pipe, and evenly distributed pulleys are movably installed on the outside of the straightening casing. When the device is lowered into the completion string, the sliding friction between the device and the inner wall of the completion string is converted into rolling friction through the pulley, thereby reducing the probability of friction between the external components of the device and the inner wall of the completion string, and preventing the external components of the device from getting stuck in the completion string.

[0004] However, the above solution still has some shortcomings. A sandblaster is installed on the oil pipe for perforating operation. However, since the sandblaster is fixed, the number of perforation positions is also fixed. When large-scale perforating operation is required, the device needs to be repeatedly placed in the well for perforating, which is extremely inconvenient and reduces the practicality of the device. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides a horizontal well hydraulic jet staged fracturing tool, which has the advantages of being able to achieve large-scale perforation operations with a small number of jet holes, solving the problem that the devices in the prior art are inconvenient for large-scale perforation operations.

[0006] The present invention provides a horizontal well hydraulic jet staged fracturing tool, wherein a plurality of jet assemblies are provided on the outer peripheral wall of the oil pipe, and the jet assemblies can be adjusted to any rotation angle around the outer peripheral wall of the oil pipe; a plurality of packers are fixed on the outer peripheral wall of the oil pipe, a hydraulic motor is fixed to the right end of the oil pipe, a rubber scraper is fixed to the output shaft of the hydraulic motor, and a crushing assembly is provided on the rubber scraper.

[0007] Preferably, the injection assembly includes an annular groove provided on the outer peripheral wall of the oil pipe, an annular bin is rotatably connected on the outer peripheral wall of the oil pipe and located in the annular groove, an annular notch is provided on the inner peripheral wall of the annular bin, a connecting hole connected to the annular notch is provided on the inner peripheral wall of the oil pipe, a plurality of nozzles are fixed on the outer peripheral wall of the annular bin, a first motor is fixed on the inner top wall of the oil pipe, a rectangular groove connected to the annular groove is provided in the inner peripheral wall of the oil pipe and located on the left side of the annular groove, an annular rack is fixed on the left side of the annular bin, a gear meshing with the annular rack is fixed on the top of the output shaft of the first motor, annular sealing plates are fixed on the left and right sides of the annular bin, sealing fillers are filled in the annular groove and located on the left and right sides of the annular bin, and two annular pressure plates are fixed on the outer peripheral wall of the oil pipe.

[0008] Preferably, the plurality of packers and the plurality of injection assemblies are distributed in sequence and at equal intervals along the outer circumferential wall of the oil pipe.

[0009] Preferably, the annular bin is a circular bin, and the plurality of nozzles are distributed at equal angles in a circle with the central axis of the annular bin as the center.

[0010] Preferably, there are four nozzles.

[0011] Preferably, the first motor is a waterproof motor, and the tooth surface of the annular rack is located on the left side of the annular rack.

[0012] Preferably, the sealing filler is located on the outside of the annular sealing plate, and the two annular pressure plates are respectively located on the left and right sides of the annular sliding groove and extend to the top of the annular sealing plate.

[0013] Preferably, the crushing assembly includes a receiving groove opened on the right side of the rubber scraper, a hydraulic cylinder is fixed to the left side of the inner cavity of the receiving groove, a mounting plate is fixed to the right end of the hydraulic cylinder, a second motor is fixed to the right side of the mounting plate, a screw is fixed to the right end of the output shaft of the second motor, a threaded block is threadedly connected to the outer peripheral wall of the screw, a baffle is rotatably connected to the right end of the screw, two crushing knives are hinged to the left side of the baffle, a hinged rod with one end hinged to the outer peripheral wall of the crushing knife is hinged to the outer peripheral wall of the threaded block, and a plurality of support rods are fixed between the mounting plate and the baffle.

[0014] Preferably, the mounting plate is clearance-matched with the receiving groove, the baffle is clearance-matched with the receiving groove, and a rubber ring is fixed on the outer peripheral wall of the mounting plate.

[0015] Preferably, a threaded hole is provided on the left side of the threaded block for the screw to pass through horizontally and to be matched with the screw.

[0016] Preferably, the right side of the crushing knife is a blade portion, and when the crushing knife is vertically penetrated, the right blade portion extends to the right side of the baffle.

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

[0018] (1) The horizontal well hydraulic jet staged fracturing tool provided by the present invention, when in use, the perforation operation is completed by the jet assembly, and the jet assembly can be rotated and adjusted around the outer peripheral wall of the oil pipe, so that the jet assembly can more conveniently complete large-scale perforation operations, which is more convenient to use. At the same time, the rotation adjustment of the jet assembly is not limited by the angle and can be rotated at will without the problem of pipeline entanglement and twisting, which is more practical.

[0019] (2) The horizontal well hydraulic jet segmented fracturing tool provided by the present invention, when in use, drives the rubber scraper to rotate by a hydraulic motor, so that the fracturing sand adhering to the inner wall of the completion string falls off. At the same time, a foldable crushing component is provided inside the rubber scraper so that when encountering harder materials, they can be crushed by the crushing component, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A longitudinal cross-sectional schematic diagram of an embodiment of the present invention;

[0021] Figure 2 1 is a front longitudinal sectional schematic diagram of an annular bin portion according to an embodiment of the present invention;

[0022] Figure 3 A schematic longitudinal cross-sectional view of a portion of a spray assembly according to an embodiment of the present invention;

[0023] Figure 4 A schematic side longitudinal cross-sectional view of an annular bin portion according to an embodiment of the present invention;

[0024] Figure 5 For the present invention Figure 1 Enlarged schematic diagram of point A in the middle.

[0025] In the figure: 1-completion string, 2-oil pipe, 3-injection assembly, 301-annular slide, 302-annular chamber, 303-annular notch, 304-connecting hole, 305-nozzle, 306-first motor, 307-rectangular groove, 308-annular rack, 309-gear, 310-annular sealing plate, 311-sealing packing, 312-annular pressure plate, 4-packer, 5-hydraulic motor, 6-rubber scraper, 7-crushing assembly, 701-receiving groove, 702-hydraulic cylinder, 703-mounting plate, 704-second motor, 705-screw, 706-threaded block, 707-baffle, 708-crushing knife, 709-hinged rod, 710-support rod. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-5 , the specific implementation methods of the present invention are described in detail.

[0027] The present invention provides a horizontal well hydraulic jet staged fracturing tool, comprising a completion string 1 and an oil pipe 2 located inside the completion string 1, a plurality of jet assemblies 3 are provided on the outer peripheral wall of the oil pipe 2, and when in use, the jet assembly 3 completes the perforation operation, and the jet assembly 3 can be rotated and adjusted around the outer peripheral wall of the oil pipe 2, thereby enabling the jet assembly 3 to more conveniently complete large-scale perforation operations, making it more convenient to use. At the same time, the rotation adjustment of the jet assembly 3 is not limited by the angle and can be rotated at will, without the problem of pipeline entanglement and twisting, making it more practical and easy to use. 2 is fixed with a plurality of packers 4 on the peripheral wall, and the plurality of packers 4 and the plurality of injection assemblies 3 are distributed at equal intervals along the peripheral wall of the oil pipe 2. A hydraulic motor 5 is fixed to the right end of the oil pipe 2, and a rubber scraper 6 is fixed to the output shaft of the hydraulic motor 5. The rubber scraper 6 is provided with a crushing assembly 7. When in use, the hydraulic motor 5 drives the rubber scraper 6 to rotate, so that the fracturing sand adhering to the inner wall of the completion string 1 falls off. At the same time, a foldable crushing assembly 7 is provided inside the rubber scraper 6 so that when encountering harder materials, they can be crushed by the crushing assembly 7, which is more practical.

[0028] In certain specific embodiments of the present invention, the injection assembly 3 includes an annular groove 301 provided on the outer peripheral wall of the oil pipe 2, an annular bin 302 is rotatably connected on the outer peripheral wall of the oil pipe 2 and located in the annular groove 301, an annular notch 303 is provided on the inner peripheral wall of the annular bin 302, a connecting hole 304 connected to the annular notch 303 is provided on the inner peripheral wall of the oil pipe 2, and a plurality of nozzles 305 are fixed on the outer peripheral wall of the annular bin 302. When in use, sand is added to the oil pipe 2, and the injection liquid enters the annular bin 302 through the connecting hole 304 and the annular notch 303 on the oil pipe 2, and is further ejected through the nozzle 305 to complete the perforation operation.

[0029] In some specific embodiments of the present invention, a first motor 306 is fixed on the inner top wall of the oil pipe 2, a rectangular groove 307 connected to the annular groove 301 is opened in the peripheral wall of the oil pipe 2 and on the left side of the annular groove 301, an annular rack 308 is fixed to the left side of the annular bin 302, and a gear 309 meshing with the annular rack 308 is fixed to the top end of the output shaft of the first motor 306. When adjustment is needed, the first motor 306 is started, the first motor 306 drives the gear 309 to rotate, the gear 309 drives the annular rack 308 to rotate, and the annular rack 308 drives the annular bin 302 to rotate along the annular groove 301 on the outer peripheral wall of the oil pipe 2, further driving the nozzle 305 to rotate for adjustment, so as to facilitate large-scale perforating operations without pulling out the oil pipe 2 Reinstall the position of the nozzle 305, annular sealing plates 310 are fixed on the left and right sides of the annular bin 302, and sealing fillers 311 are filled in the annular groove 301 and on the left and right sides of the annular bin 302. Two annular pressure plates 312 are fixed on the outer peripheral wall of the oil pipe 2, and the sealing filler 311 is located on the outside of the annular sealing plate 310. The two annular pressure plates 312 are respectively located on the left and right sides of the annular groove 301 and extend to the top of the annular sealing plate 310. When assembling the injection assembly 3, the annular pressure plate 312 is fixed after filling the sealing filler 311. The sealing filler 311 between the annular pressure plate 312 and the annular sealing plate 310 can better play a sealing role, thereby preventing liquid leakage inside the annular groove 301.

[0030] In certain specific embodiments of the present invention, the annular warehouse 302 is a circular annular warehouse, and multiple nozzles 305 are distributed at equal angles in a circle with the central axis of the annular warehouse 302 as the center. The first motor 306 is a waterproof motor, and the tooth surface of the annular rack 308 is located on the left side of the annular rack 308.

[0031] Reference Attachment Figure 5In some specific embodiments of the present invention, the crushing assembly 7 includes a receiving groove 701 provided on the right side of the rubber scraper 6. A hydraulic cylinder 702 is fixed to the left side of the inner cavity of the receiving groove 701, and a mounting plate 703 is fixed to the right end of the hydraulic cylinder 702. When in use, the rubber scraper 6 is driven to rotate by the hydraulic motor 5 to cause the fracturing sand adhering to the inner wall of the completion string 1 to fall off. When the crushing assembly 7 is needed to crush harder materials, the hydraulic cylinder 702 is started, and the hydraulic cylinder 702 pushes the mounting plate 703 to slide rightward along the receiving groove 701. A second motor 704 is fixed to the right side of the mounting plate 703, and a screw 705 is fixed to the right end of the output shaft of the second motor 704. When the mounting plate 703 approaches the right side of the receiving groove 701, the hydraulic cylinder 702 is stopped and the second motor 704 is started. The second motor 704 drives the screw 705 to rotate, and the screw 705 The outer wall of the block 706 is threadedly connected, and the right end of the screw 705 is rotatably connected to the baffle 707. The left side of the baffle 707 is hinged with two crushing knives 708. The outer wall of the crushing knife 708 is hinged with a hinged rod 709 with one end hinged on the outer wall of the threaded block 706. The screw 705 drives the threaded block 706 to move to the right, and the threaded block 706 drives the hinged rod 709 to flip. When the hinged rod 709 unfolds the crushing knife 708 to a vertical state, the rubber scraper 6 can rotate to drive the crushing knife 708 to rotate, thereby crushing the hard objects on the front side of the rubber scraper 6. A plurality of support rods 710 are fixed between the mounting plate 703 and the baffle 707. The support rods 710 increase the stability of the connection between the mounting plate 703 and the baffle 707, and at the same time prevent the baffle 707 from affecting the expansion and contraction of the crushing knife 708 as the screw 705 rotates.

[0032] In certain specific embodiments of the present invention, the mounting plate 703 is loosely fitted with the receiving groove 701, the baffle 707 is loosely fitted with the receiving groove 701, a rubber ring is fixed on the outer peripheral wall of the mounting plate 703, a threaded hole is provided on the left side of the threaded block 706 for the screw 705 to pass horizontally through and be compatible with it, the right side of the crushing knife 708 is the blade part, and when the crushing knife 708 is vertically penetrated, its right side blade part extends to the right side of the baffle 707.

[0033] The working process of one embodiment of the present invention is as follows:

[0034] During use, sand is added to the oil pipe 2, and the injection liquid enters the annular bin 302 through the connecting hole 304 and the annular groove 303 on the oil pipe 2, and is further sprayed out through the nozzle 305 to complete the perforation operation. When adjustment is needed, the first motor 306 is started, and the first motor 306 drives the gear 309 to rotate, and the gear 309 drives the annular rack 308 to rotate, and the annular rack 308 drives the annular bin 302 to rotate along the annular groove 301 on the outer peripheral wall of the oil pipe 2, and further drives the nozzle 305 to rotate for adjustment, which facilitates large-scale perforation operations without pulling out the oil pipe 2 and reinstalling the nozzle 305.

[0035] During use, the rubber scraper 6 is driven by the hydraulic motor 5 to rotate, so that the fracturing sand adhering to the inner wall of the completion string 1 falls off. When the crushing assembly 7 is needed to crush harder materials, the hydraulic cylinder 702 is started, and the hydraulic cylinder 702 pushes the mounting plate 703 to slide to the right along the receiving groove 701. When the mounting plate 703 is close to the right side of the receiving groove 701, the hydraulic cylinder 702 is stopped to start the second motor 704. The second motor 704 drives the screw 705 to rotate, and the screw 705 drives the threaded block 706 to move to the right. The threaded block 706 drives the hinged rod 709 to flip, and the hinged rod 709 unfolds the crushing knife 708 to a vertical state. At this time, the rotation of the rubber scraper 6 can drive the crushing knife 708 to rotate, thereby crushing the hard objects on the front side of the rubber scraper 6.

[0036] The present invention controls the first motor, hydraulic motor, hydraulic cylinder, and second electrode through a controller connected thereto. The control logic of the controller can be designed by a person skilled in the art based on the above requirements and can be implemented through simple programming. The provision of power is also common knowledge in the art and is not the focus of the present invention. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0037] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A horizontal well hydraulic jet staged fracturing tool, characterized in that: A plurality of injection assemblies are provided on the outer peripheral wall of the oil pipe, and the injection assemblies can be adjusted to any rotation angle around the outer peripheral wall of the oil pipe; a plurality of packers are fixed on the outer peripheral wall of the oil pipe, a hydraulic motor is fixed on the right end of the oil pipe, a rubber scraper is fixed on the output shaft of the hydraulic motor, and a crushing assembly is provided on the rubber scraper.

2. The horizontal well hydraulic jet staged fracturing tool according to claim 1, characterized in that: The nozzle is provided on the inner wall of the annular groove, and a connecting hole is provided on the inner wall of the annular groove to connect the nozzle. The nozzle is provided on the inner wall of the annular groove to connect the nozzle. The nozzle is provided on the outer wall of the annular groove to connect the nozzle.

3. The horizontal well hydraulic jet staged fracturing tool according to claim 2, characterized in that: The annular bin is a circular bin, and the plurality of nozzles are distributed in a circular pattern with equal angles around the central axis of the annular bin as the center.

4. The horizontal well hydraulic jet staged fracturing tool according to claim 3, characterized in that: There are four nozzles.

5. The horizontal well hydraulic jet staged fracturing tool according to claim 1, characterized in that: The plurality of packers and the plurality of injection assemblies are distributed in sequence and at equal intervals along the outer peripheral wall of the oil pipe.

6. The horizontal well hydraulic jet staged fracturing tool according to claim 1, characterized in that: The first motor is a waterproof motor, and the tooth surface of the annular rack is located on the left side of the annular rack.

7. The horizontal well hydraulic jet staged fracturing tool according to claim 2, characterized in that: The sealing filler is located on the outside of the annular sealing plate, and the two annular pressure plates are respectively located on the left and right sides of the annular sliding groove and extend to the top of the annular sealing plate.

8. The horizontal well hydraulic jet staged fracturing tool according to claim 1, characterized in that: The crushing assembly includes a receiving groove opened on the right side of the rubber scraper, a hydraulic cylinder is fixed to the left side of the inner cavity of the receiving groove, a mounting plate is fixed to the right end of the hydraulic cylinder, a second motor is fixed to the right side of the mounting plate, a screw is fixed to the right end of the output shaft of the second motor, a threaded block is threadedly connected to the outer peripheral wall of the screw, a baffle is rotatably connected to the right end of the screw, two crushing knives are hinged to the left side of the baffle, a hinged rod with one end hinged to the outer peripheral wall of the crushing knife is hinged to the outer peripheral wall of the threaded block, and a plurality of support rods are fixed between the mounting plate and the baffle.

9. The horizontal well hydraulic jet staged fracturing tool according to claim 8, characterized in that: The mounting plate is in clearance fit with the receiving groove, the baffle is in clearance fit with the receiving groove, and a rubber ring is fixed on the outer peripheral wall of the mounting plate.

10. The horizontal well hydraulic jet staged fracturing tool according to claim 8, characterized in that: A threaded hole for the screw rod to pass through horizontally and to match the screw rod is provided on the left side of the threaded block.

11. The horizontal well hydraulic jet staged fracturing tool according to claim 8, characterized in that: The right side of the crushing knife is a blade portion. When the crushing knife is vertically penetrated, the right blade portion extends to the right side of the baffle.

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