Safety release convenient for recycling staged hydraulic fracturing equipment

Abstract

The utility model provides a safety release convenient for recovering segmented hydraulic fracturing equipment, and particularly relates to the technical field of hydraulic fracturing. The safety release is arranged on one side, close to a drilling hole opening, of a fracturing equipment string on a fracturing pipeline and comprises a first release part and a second release part. One end of the first releasing part is in threaded connection with the fracturing pipeline; the other end of the first releasing piece is connected with one end of the second releasing piece in a clamped mode, and the other end of the second releasing piece is connected with a packer in a screwed mode. The device is simple in structure and convenient to mount and dismount; when collapse occurs in a drill hole, the pressure building ball can be pushed to the safety release reducing position through high-pressure water, the first release part and the second release part are separated through pressure building, then a thin fracturing pipe column is pulled out of the drill hole to be recycled, the working efficiency is improved, meanwhile, the engineering construction cost can be reduced, and hidden dangers of follow-up caving work are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic fracturing, in particular to a safe release device for facilitating the recovery of segmented hydraulic fracturing equipment. Background Art

[0002] To address rock bursts, dust, and roof erosion, mines currently employ hydraulic fracturing technology. Hydraulic fracturing utilizes high-pressure pumps to cut grooves and inject water. The high pressure generated by the water injection creates cracks at the ends of the cuts, which then expand and extend within the coal and rock formations. This significantly increases the size of the cracks, fracturing the roof strata or coal, disrupting their integrity and reducing their overall strength.

[0003] Long-beam hydraulic fracturing, developed based on hydraulic fracturing, is a top-coal caving technology used in top-coal caving. It can completely replace blasting in top-coal caving operations, enabling top-coal caving to be accomplished using a single long-beam hydraulic fracturing technique. This eliminates the risks associated with blasting, such as flammability and high costs, while also being applicable in a wider range of applications.

[0004] The fracturing components of hydraulic fracturing operations include incline guides, one-way valves, packers, throttles, fracturing strings, high-pressure hoses and other equipment. Due to the collapse of the holes and displacement of the coal seams after hydraulic fracturing operations, the equipment cannot be recovered, resulting in waste of resources. In addition, due to the large number of fracturing strings used under the corresponding working conditions of long-seam drilling, the waste of resources caused by the inability to recover the equipment will greatly increase the cost. Utility Model Content

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a safe release device for facilitating the recovery of staged hydraulic fracturing equipment. The specific technical solution is as follows:

[0006] A safety release for facilitating the recovery of staged hydraulic fracturing equipment is used to be arranged on a fracturing pipe on one side of the fracturing equipment string near the borehole orifice, and includes a first release member and a second release member, both of which are hollow tubular structures; one end of the first release member is threadedly connected to the fracturing pipe, and the other end is clamped to one end of the second release member; the other end of the second release member is threadedly connected to a packer.

[0007] Preferably, a plurality of cross-shaped clamping blocks are provided at equal intervals along the circumferential direction on the end surface of the first releasing member close to the second releasing member; a clamping groove matching the plurality of clamping blocks is provided on the end surface of the second releasing member close to the first releasing member; and the first releasing member is clamped with the plurality of clamping grooves of the second releasing member through the plurality of clamping blocks.

[0008] Preferably, the inner cavity of the first release member close to the second release member is provided with a first diameter-reducing opening; the inner cavity of the second release member close to the first release member is provided with a second diameter-reducing opening; the first diameter-reducing opening and the second diameter-reducing opening are connected.

[0009] Also preferably, the outer diameter of the first reducing opening is the same as the inner diameter of the second reducing opening, and the inner cavity at the connection between the first releasing member and the second releasing member has a stepped reducing structure.

[0010] Further preferably, the maximum pressure-bearing range of the connection between the first release member and the second release member is 20 MPa.

[0011] It is further preferred that the safety release also includes a pressure-holding ball; when the borehole collapses, a pressure-holding ball is placed at one end of the water inlet of the fracturing pipe, and the pressure-holding ball is transported with the water flow to the first reducing port for pressure holding until the pressure at the connection between the first release piece and the second release piece exceeds the pressure threshold and separates, and then the fracturing pipe string on the side of the collapsed part close to the borehole mouth is pulled out.

[0012] More preferably, the diameter of the pressure-holding ball is equal to the inner diameter of the first reducing port.

[0013] The beneficial effects of the utility model are:

[0014] The utility model has a simple structure and is easy to install. It uses a pressure-holding ball to hold the pressure at the safety release diameter change point to complete the separation of the first release part and the second release part, and then the thinner fracturing pipe string is pulled out of the borehole for recovery, which reduces the construction cost and avoids the hidden dangers of subsequent top caving work. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings that constitute the specification of this application are used to provide further understanding of this application and do not constitute improper limitations on this application.

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the combination of the present invention and a partial enlarged diagram of the connection;

[0018] Figure 3 It is a schematic diagram of the utility model during application;

[0019] In the figure, 1-first release piece; 11-first reducing port; 2-second release piece; 21-second reducing port; 3-pressure holding ball; 4-safety release; 5-fracturing pipe. DETAILED DESCRIPTION

[0020] The specific implementation method of a safe release method for facilitating the recovery of a staged hydraulic fracturing device provided by the present invention will be further described with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, a safety release for facilitating the recovery of staged hydraulic fracturing equipment is installed on the side of the fracturing equipment string near the borehole on the fracturing pipe 5. It includes a first release member 1 and a second release member 2, both of which are hollow tubular structures, and a pressure-holding ball 3. One end of the first release member 1 is threadedly connected to the fracturing pipe 5, and the other end is clamped to one end of the second release member 2. The other end of the second release member 2 is threadedly connected to the packer.

[0022] like Figure 2 As shown, the end surface of the first release member 1 close to the second release member 2 is provided with a plurality of cross-shaped clamping blocks at equal intervals along the circumferential direction (for better sealing and stability); the end surface of the second release member 2 close to the first release member 1 is provided with clamping grooves matching the plurality of clamping blocks; the first release member 1 is connected to the plurality of clamping blocks and the plurality of clamping slots of the second release member 2 through the clamping connection between the plurality of clamping blocks.

[0023] It is worth noting that, in order to create a pressure-holding space within the safety release 4, a first reducing opening 11 is provided in the inner cavity of the first release member 1 on the side near the second release member 2; a second reducing opening 21 is provided in the inner cavity of the second release member 2 on the side near the first release member 1; and the first reducing opening 11 and the second reducing opening 21 are butted together. Preferably, the outer diameter of the first reducing opening 11 is the same as the inner diameter of the second reducing opening 21, and the diameter of the pressure-holding ball 3 is equal to the inner diameter of the first reducing opening 11. The stepped reducing structure of the inner cavity at the junction of the first and second release members 1, 2, combined with the pressure-holding ball 3, achieves a pressure-holding effect within the inner cavity of the safety release 4.

[0024] Further preferably, the maximum pressure-bearing range of the connection between the first release member 1 and the second release member 2 is 20 MPa.

[0025] like Figure 3 As shown, when in use, the safety release 4 is set on the side of the fracturing equipment string on the fracturing pipe 5 close to the borehole mouth (the borehole mouth will not collapse due to the initial construction pouring). When the borehole collapses, a pressure-holding ball 3 is placed at one end of the water inlet of the fracturing pipe 5. The pressure-holding ball 3 is pumped to the first reducing port 11 of the first release part 1 with the high-pressure water flow to block the water outlet and hold the pressure until the pressure at the connection between the first release part 1 and the second release part 2 exceeds the pressure threshold. The connection between the ports of the first release part 1 and the second release part 2 is broken and separated, and then the fracturing string 5 on the side of the collapsed part close to the borehole mouth can be pulled out for recycling and reuse, thereby reducing construction costs.

[0026] The utility model has a simple structure and is easy to install, and effectively solves the problem that the collapse recovery equipment often encounters that the pipe column is stuck due to coal rock displacement, which makes it impossible to recover. The utility model can abandon the part with a larger pipe diameter that is difficult to recover and recover the rest, thereby avoiding waste of resources and saving construction costs.

[0027] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to the parts or elements of the present invention and cannot be understood as limitations on the present invention. Terms such as "connected" and "connect" should be understood in a broad sense, indicating that they can be fixedly connected, integrally connected, or detachably connected; they can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances, and they cannot be understood as limitations on the present invention.

[0028] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A safety release device for facilitating the recovery of staged hydraulic fracturing equipment, which is used to be installed on the side of the fracturing equipment string near the borehole on the fracturing pipeline, characterized in that: It includes a first releasing member and a second releasing member, both of which are hollow tubular structures; One end of the first release member is threadedly connected to the fracturing pipe, and the other end is clamped with one end of the second release member, and the other end of the second release member is threadedly connected to the packer.

2. The safe release device for facilitating recovery of staged hydraulic fracturing equipment according to claim 1, characterized in that: The end surface of the first releasing member close to the second releasing member is provided with a plurality of cross-shaped clamping blocks at equal intervals along the circumferential direction; The end surface of the second releasing member close to the first releasing member is provided with a card slot matching with a plurality of card blocks; the first releasing member is engaged with the plurality of card slots of the second releasing member through the plurality of card blocks.

3. The safe release device for facilitating recovery of staged hydraulic fracturing equipment according to claim 2, characterized in that: The inner cavity of the first release member close to the second release member is provided with a first diameter-changing opening; The inner cavity of the second releasing member close to the first releasing member is provided with a second diameter-changing opening; The first reducing port is connected to the second reducing port.

4. The safe release device for facilitating recovery of staged hydraulic fracturing equipment according to claim 3 is characterized in that: The outer diameter of the first reducing opening is the same as the inner diameter of the second reducing opening, and the inner cavity at the connection between the first releasing member and the second releasing member is a stepped reducing structure.

5. The safe release device for facilitating recovery of staged hydraulic fracturing equipment according to claim 1, characterized in that: The maximum pressure-bearing range of the connection between the first release member and the second release member is 20 MPa.

6. The safe release device for facilitating recovery of staged hydraulic fracturing equipment according to claim 5, characterized in that: The safe throwing also includes holding and pressing the ball; When the borehole collapses, a pressure-holding ball is placed at one end of the water inlet of the fracturing pipe. The pressure-holding ball is pumped with the water flow to the first reducer to hold the pressure until the pressure at the connection between the first and second release parts exceeds the pressure threshold and separates, and then the fracturing pipe string on the side of the collapsed part close to the borehole mouth is pulled out.

7. The safe release device for facilitating recovery of staged hydraulic fracturing equipment according to claim 6, characterized in that: The diameter of the pressure-holding ball is equal to the inner diameter of the first reducing port.

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