WO2024074158A1

WO2024074158A1 - Deep coal seam slotting and fracturing permeability-enhancing device

Info

Publication number: WO2024074158A1
Application number: PCT/CN2023/136243
Authority: WO
Inventors: 王登科; 陈旭; 翟成; 聂百胜; 鞠杨; 孙海涛; 朱建波; 高明忠; 柳先锋; 王刚
Original assignee: 河南理工大学
Priority date: 2022-12-13
Filing date: 2023-12-04
Publication date: 2024-04-11
Also published as: CN115749720A

Abstract

A deep coal seam slotting and fracturing permeability-enhancing device, comprising a fracturing agent supplying device (1); flow guide pipes (2), which are arranged in a drill hole formed in a deep coal seam and are in communication with an input end of the fracturing agent supplying device (1); and a fracturing and slotting device (3), which is fitted and arranged on the ends of adjacent flow guide pipes (2) and used for connecting the adjacent flow guide pipes (2).

Description

A deep coal seam cutting and fracturing permeability enhancement device

Technical Field

The invention relates to the technical field of coal mining, in particular to a deep coal seam cutting, fracturing and permeability enhancement device.

Background technique

In the process of coal mining, in order to improve the mining efficiency, the coal seam is generally cut to improve the permeability of the coal seam, so as to improve the efficiency and amount of gas extraction. At present, in the process of cutting the deep coal seam area, due to the deep coal seam area is located at a deep depth, resulting in low installation efficiency of general coal seam cutting equipment, and the fracturing cutting treatment in each coal seam area is not convenient enough.

Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art.

Summary of the invention

To achieve the above object, the present invention provides the following technical solution: a deep coal seam slit fracturing and permeability enhancement device, comprising:

Fracturing agent supply device;

The flow guide pipe is arranged in a borehole opened in a deep coal seam and is connected to an input end of a fracturing agent supply device;

A fracturing and slitting device, which is cooperatively arranged on the ends of the adjacent flow guide pipes and is used to connect the adjacent flow guide pipes;

The fracturing and cutting device comprises:

An energy boosting assembly is arranged on one end of the flow guide tube;

A accommodating limiter assembly is arranged on the other end of the flow guide pipe; and

The two ends of the slitting assembly are respectively rotatably assembled with the energy boosting assembly and the accommodating and limiting assembly through a rotating ring 1;

The slitting assembly comprises:

The second installation cylinder has a circumferentially distributed accommodating cavity on its annular wall close to one end of the energy boosting assembly. A plugging seat is provided in the outer diameter opening, a rotating disk is installed in the plugging seat, a connecting pipe is provided in the rotating disk to connect the outside of the outer diameter opening of the accommodating cavity with the inner diameter opening of the accommodating cavity, and the outer pipe opening of the connecting pipe is connected with a fracturing slit pipe, the wall of the fracturing slit pipe is provided with a jet penetration enhancement hole, and a telescopic mandrel frame is fixed to the inner pipe opening of the connecting pipe;

A slide rail, axially arranged on the side wall of the inner diameter opening of the accommodating cavity; and

The toothed slide plate slides in the slide rail, the teeth on its upper plate surface are engaged and inlaid with the telescopic top rod frame, and the lower plate surface is provided with a telescopic trapezoidal top head fixed vertically therewith;

The jet permeability enhancement hole is arranged in a side area of the second cylinder wall facing away from the mounting cylinder.

Beneficial effects:

In the present invention, during the laying process of the guide pipe, the fracturing and cutting device is laid and installed to flexibly position the deep layers of various areas of the coal seam. Among them, through the energy enhancement component, the cutting component and the accommodating and limiting component, there are diverse options for the shape and angle of the coal seam cutting, and it is possible to flexibly provide more specific and appropriate coal seam cutting surface position options according to the coal seam texture structure, and further improve the stability, smoothness and cutting efficiency during the cutting process.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a deep coal seam slit fracturing and permeability enhancement device according to the present invention;

FIG2 is a schematic diagram of the structure of the fracturing and slitting device of the present invention;

FIG3 is an enlarged schematic diagram of a local structure of a slitting assembly of the present invention;

FIG4 is an enlarged schematic diagram of a local structure of a fracturing slotted pipe according to the present invention;

FIG5 is an enlarged schematic diagram of a local structure of an energy boosting component of the present invention;

FIG6 is an enlarged schematic diagram of a local structure of a flow control frame of the present invention;

FIG7 is a schematic diagram of a flow control frame deformation implementation of the present invention;

In the figure: 1, fracturing agent supply device; 2, flow guide pipe; 3, fracturing slit device; 4, accommodation limit assembly; 5, slit assembly; 6, energy enhancement assembly; 7, rotating ring one; 8, wire rope; 41, installation cylinder one; 42, accommodation groove; 43, limit stop frame; 44, docking ring one; 51, installation cylinder two; 52, accommodation cavity; 53, rotating disk; 54, connecting pipe; 55, fracturing slit pipe; 56, telescopic top rod frame; 57, slide rail; 58, blocking seat; 59, toothed slide plate; 510, telescopic trapezoidal top head; 511, jet penetration hole; 61, installation cylinder three; 62, telescopic slide; 63, installation shaft rod; 64, guide cone cylinder one; 65, guide cone cylinder two; 66, energy enhancement flow blocking frame; 67, docking ring two; 68, flow control frame; 661, rotating ring two; 662. Guide rod; 663. Connecting spring; 664. Baffle plate; 665. Inverted trapezoidal retaining ring; 666. Shrinking ring; 667. Telescopic joint; 668. Baffle blade; 681. Mounting ring; 682. Hinge joint; 683. Short rotating shaft; 684. Fan-shaped plate; 685. Reinforcement rib; 686. Tension elastic member.

Detailed ways

1-7, the present invention provides a technical solution: a deep coal seam slit fracturing and permeability enhancement device, comprising:

Fracturing agent supply device 1;

The flow guide pipe 2 is arranged in a borehole opened in a deep coal seam and is connected to the input end of the fracturing agent supply device 1;

The fracturing and cutting device 3 is cooperatively arranged on the ends of the adjacent flow guiding pipes 2 and is used for connecting the adjacent flow guiding pipes 2 .

The fracturing and cutting device 3 comprises:

The energy boosting assembly 6 is arranged on one end of the flow guide tube 2;

A accommodating limiter assembly 4 is arranged on the other end of the flow guide tube 2; and

The two ends of the slit assembly 5 are respectively rotatably assembled with the energy boosting assembly 6 and the accommodating and limiting assembly 4 through a rotating ring 7;

In specific implementation, the energy-enhancing component 6 and the accommodation and limiting component 4 are pre-fixed and assembled at the pipe openings at both ends of the guide pipe 2. When the guide pipe 2 is butt-jointed and installed, the slit component 5 is installed, and the slit component 5 is installed and connected to the energy-enhancing component 6 and the accommodation and limiting component 4 at the corresponding ends by rotating the ring 1 7.

The slotting assembly 5 comprises: a mounting cylinder 51, whose end facing the energy boosting assembly 6 is provided with a circumferentially distributed accommodation cavity 52 on its annular wall, and a blocking seat 58 is provided in the outer diameter opening of the accommodation cavity 52. Referring to FIG. 3, the blocking seat 58 seals and intercepts the outer diameter opening of the accommodation cavity 52 transversely, and a rotating disk 53 is installed in the blocking seat 58. The rotating disk 53 is provided with a connecting pipe 54 that connects the outer diameter opening of the accommodation cavity 52 with the inner diameter opening of the accommodation cavity 52, and the outer pipe opening of the connecting pipe 54 is connected with a fracturing slotting pipe 55. The wall of the fracturing slotted pipe 55 is provided with a jet permeability enhancement hole 511, and a telescopic mandrel frame 56 is fixed to the inner pipe opening of the connecting pipe 54; a slide rail 57 is axially arranged on the side wall of the inner diameter opening of the accommodating cavity 52; and a latching slide plate 59 slides in the slide rail 57, the upper plate surface of which is engaged and embedded with the telescopic mandrel frame 56, and the lower plate surface is provided with a telescopic trapezoidal head 510 fixed vertically thereto; the trapezoidal end of the telescopic trapezoidal head 510 is provided with a concave hole; the jet permeability enhancement hole 511 is arranged on the back of the mounting tube 2. One side area of the cylinder wall;

In specific implementation, referring to FIG. 3 , when the telescopic trapezoidal mandrel 510 is subjected to force and has a tendency to move rightward, the toothed slide plate 59 clamps the trapezoidal end of the telescopic mandrel frame 56 and has a tendency to move rightward, and the telescopic mandrel frame 56 has an automatic contraction tendency, so that the rotating disk 53 has a counterclockwise rotation tendency, and as the fracturing slit pipe 55 continuously cuts the coal seam surface, the telescopic trapezoidal mandrel 510 synchronously moves to the right, and then transmits to the fracturing slit pipe 55 to synchronously rotate and open along the axial surface, thereby cutting the coal seam in the direction of the guide pipe 2;

The telescopic trapezoidal top head 510 is configured into multiple specifications, that is, when subjected to the same pressure, the contraction amounts of the telescopic trapezoidal top heads 510 of multiple specifications are different. Therefore, before the inverted trapezoidal clamping ring 665 is engaged and fixed with the telescopic trapezoidal top head 510, different axial movement amounts of the inverted trapezoidal clamping ring 665 can be obtained, and the rotation and opening angle of the fracturing slit tube 55 along the axial plane can be controlled. Therefore, when selecting the slit of the coal seam, the fracturing slit tube 55 has a variety of selectivity around the rotary slit surface and the axial slit surface, and can flexibly provide more specific and appropriate selection of the coal seam slit surface position according to the coal seam texture structure.

The accommodating and limiting component 4 includes a mounting tube 41, whose outer tube wall close to one end of the slitting component 5 is provided with a accommodating groove 42, and its inner tube wall close to one end of the slitting component 5 is provided with a docking ring 44, and the inner side of the docking ring 44 is also provided with a limiting stop frame 43 fixed on the inner tube wall of the mounting tube 41.

The energy boosting assembly 6 comprises: a mounting tube 3 61, on the inner wall of which the end close to the slotting assembly 5 is fixed with a docking ring 2 67; a telescopic slide 62, one end of which is connected to the inner wall of the mounting tube 3 61 located inside the docking ring 2 67, and the other end of which is coaxially fixed with a mounting shaft rod 63, and the two ends of the mounting shaft rod 63 are respectively fixed with a guide cone 1 64 and a guide cone 2 65 with openings facing each other, and the cone walls of the guide cone 1 64 and the guide cone 2 65 are respectively provided with a guide port 1 and a guide port 2, so as to reduce the resistance of the fracturing agent to flow in the guide pipe 2 when the fracturing agent is not completely filled into the entire laid guide pipe 2. That is, the kinetic energy of the fracturing agent initially supplied by the fracturing agent supply device 1 in the guide pipe 2 needs to satisfy the requirement that the impact energy received by the telescopic slide 62 is not enough to make the telescopic slide 62 move completely to the right, so as to reduce the impact of the fracturing agent on the fracturing and slitting device 3 at this time. When the fracturing agent is completely filled into the entire laid guide pipe 2, the supply kinetic energy of the fracturing agent is increased again, so that all the fracturing and slitting devices 3 can operate relatively synchronously, thereby enhancing the controllability of the coal seam slitting; and the energy-enhancing flow-blocking frame 66 installed in conjunction with the installation of the shaft rod 63, the guide cone 1 64 and the guide cone 2 65.

The energy-boosting spoiler 66 comprises: a second rotating ring 661, which is rotatably mounted on both ends of the mounting shaft 63, and a guide rod 662 is fixed between the facing annular surfaces of the two sets of second rotating rings 661; a spoiler plate 664, which is sleeved on the Installed on the shaft rod 63 and the guide rod 662 and slidably connected, the two side ends of the axial middle part are respectively connected with the connecting spring 663, and the outer ring surface is provided with an inverted trapezoidal clamping ring 665 that can be engaged with the end of the telescopic trapezoidal head 510, and the other ends of the connecting springs 663 on both sides are respectively connected with the ring surfaces of the rotating ring 2 661 on both sides, and the two side ends of the middle part of the baffle plate 664 are also respectively fixed with long tube rings; the flow control frame 68 is installed on the inner tube wall of the guide cone 1 64; the shrinking ring 666 is installed on the outer tube wall of the guide cone 2 65, and a groove is opened inside it, and a telescopic butt joint 667 is provided in the groove;

In specific implementation, when the guide cone 64 is matched with the docking ring 67, the telescopic docking joint 667 and the docking ring 44, the fracturing agent is restricted to flow in from the guide port 1 at an accelerated speed, and after being energized by the flow control frame 68, it impacts the baffle plate 664, and then cooperates with the action of the connecting spring 663. At this time, the fracturing agent in the local chamber where the connecting pipe 54 is located will be filled into the connecting pipe 54, enter the fracturing slot pipe 55, and be ejected through the jet permeability enhancement hole 511 to slot the coal seam; the inverted trapezoidal clamp ring 6 65 is also provided with a convex column that can cooperate with the concave hole so that the inverted trapezoidal clamping ring 665 can be embedded and fixed with the telescopic trapezoidal top head 510; in addition, the setting structure of the telescopic butt joint 667 and the shrinking ring 666 makes the diameter of the guide cone 65 smaller so as to preserve the energy of the fracturing agent in the chamber where the baffle plate 664 is located, and the initial position of the telescopic butt joint 667 is inside the installation tube 3 61, so that when it moves to the right, it can pass through the telescopic trapezoidal top head 510 more smoothly.

The baffle plate 664 is fixed with baffle blades 668 on the outer wall of the long cylindrical ring on one side of the guide cone 65, which can convert the kinetic energy of the fracturing agent into energy for driving the slit assembly 5 to rotate, and is also beneficial to the smoothness of the flow of the fracturing agent, avoiding the accumulation of some substances in the fracturing agent in the slit assembly 5 area.

The flow control frame 68 includes a mounting ring 681, on the inner ring wall of which a hinge head 682 that can swing along the axial plane is rotatably mounted, and multiple groups are evenly distributed on the circumference. A short rotating shaft 683 is rotatably mounted on the lower end of the hinge head 682, and the lower end of the short rotating shaft 683 is fixedly connected to the outer arc surface end of the fan-shaped patch 684. Reinforcement ribs 685 are fixed on both sides of the fan-shaped patch 684. The two groups of reinforcement ribs 685 are respectively offset from the center line of the fan-shaped patch 684 and are arranged in reverse. In addition, both sides of the hinge head 682 are also provided with pulling elastic members 686 connected to the inner wall of the mounting ring 681, and the other ends of the pulling elastic members 686 on both sides are respectively connected to the reinforcement ribs 685 on both sides; the end of the mounting shaft rod 63 close to one end of the telescopic slide 62 is also connected to the wire rope 8 that penetrates and is introduced into the guide tube 2;

In specific implementation, as the flow intensity of the fracturing agent increases, as shown in FIG. 7 , the flow control frame 68 in this structure, under the action of the fracturing agent, especially in the area where it is located, the caliber of the fracturing agent flow can be changed to a certain extent, that is, when the flow control frame 68 is in the change of the left part, The fracturing agent in the area where the fracturing slit pipe 55 is located will be further energized as the energy of the fracturing agent increases. At this time, the fracturing slit pipe 55 has not yet rotated, so as to control the energy increment required for the fracturing slit pipe 55 to cut the coal seam. When the flow control frame 68 is in the change of the right part, the flow control frame 68 reduces the energy increase of the fracturing agent, so as to ensure the safe use of the fracturing slit device 3.

In the specific implementation, a deep coal seam area where slit fracturing and permeability enhancement is required is selected, and then a hole is drilled at the position where the slit fracturing and permeability enhancement is required in this deep coal seam area. After completion, a flow guide pipe 2 is introduced into the borehole, and a fracturing slit device 3 is installed at the connecting end of the adjacent flow guide pipes 2. The initial position of the telescopic joint 667 of the fracturing slit device 3 is located on the inner side of the docking ring 2 67. After the flow guide pipe 2 is laid, the fracturing agent is filled into the flow guide pipe 2 through the fracturing agent supply device 1, and the fracturing agent passes through the area where the fracturing slit device 3 is located. 2, as the high-pressure flow of the fracturing agent is carried out, the telescopic slide 62 is pushed to move rightward, and the right end of the mounting shaft 63 is moved to press against the limit stop frame 43. At this time, the guide cone 1 64 is tightly fitted with the docking ring 2 67, and the telescopic docking joint 667 is tightly fitted with the docking ring 1 44, and the flow channel of the fracturing agent is restricted. At this time, the flow control frame 68 is in the change of the right part shown in FIG. 7, and the fracturing agent flows through the inner contraction of the flow control frame 68 and impacts the baffle plate 664. The inner contraction of the flow control frame 68 and the baffle blades are tightly fitted. 668, the liquid energy in the chamber increases and is ejected from the jet permeability enhancement hole 511 in the fracturing slotted tube 55. Combined with the pushing effect of the inverted trapezoidal clamping ring 665 on the telescopic trapezoidal top 510, the continuous slitting depth of the fracturing slotted tube 55 and the limiting effect of the coal seam, the fracturing slotted tube 55 will gradually open. As shown in FIG. 2, when the telescopic trapezoidal top 510 is compressed and embedded in the inverted trapezoidal clamping ring 665, the telescopic trapezoidal top 510 and the inverted trapezoidal clamping ring 665 are embedded and fixed to form an integral structure, and the flow-blocking blade 668 stops. The rotation is stopped. As the energy of the liquid in the chamber between the constricted opening in the flow control frame 68 and the choke blades 668 increases again, the choke blades 668 provide a certain torque for the slitting assembly 5 as a whole. As the jet permeability enhancement hole 511 impacts the slitting, the slitting assembly 5 rotates around the axis while slitting. That is, during the high-pressure flow of the fracturing agent, the fracturing slit tube 55 will open along the axial plane. When the telescopic trapezoidal head 510 is compressed and embedded in the inverted trapezoidal retaining ring 665, the fracturing slit tube 55 will rotate around the axis to slit.

Claims

A deep coal seam slit fracturing and permeability enhancement device, characterized in that it comprises:

Fracturing agent supply device;

The flow guide pipe is arranged in a borehole opened in a deep coal seam and is connected to an input end of a fracturing agent supply device;

A fracturing and slitting device, which is cooperatively arranged on the ends of the adjacent flow guide pipes and is used to connect the adjacent flow guide pipes;

The fracturing and cutting device comprises:

An energy boosting assembly is arranged on one end of the flow guide tube;

A accommodating limiter assembly is arranged on the other end of the flow guide pipe; and

The two ends of the slitting assembly are respectively rotatably assembled with the energy boosting assembly and the accommodating and limiting assembly through a rotating ring 1;

The slitting assembly comprises:

The second installation cylinder has a circumferentially distributed accommodating cavity on its annular wall close to one end of the energy boosting component, a plugging seat is provided in the outer diameter opening of the accommodating cavity, a rotating disk is installed in the plugging seat, a connecting pipe is provided in the rotating disk to connect the outside of the outer diameter opening of the accommodating cavity with the inner diameter opening of the accommodating cavity, and the outer pipe opening of the connecting pipe is connected with a fracturing slit pipe, the wall of the fracturing slit pipe is provided with a jet penetration enhancement hole, and a telescopic mandrel frame is fixed to the inner pipe opening of the connecting pipe;

A slide rail, axially arranged on the side wall of the inner diameter opening of the accommodating cavity; and

The toothed slide plate slides in the slide rail, the teeth on its upper plate surface are engaged and inlaid with the telescopic top rod frame, and the lower plate surface is provided with a telescopic trapezoidal top head fixed vertically therewith;

The jet permeability enhancement hole is arranged in a side area of the second cylinder wall facing away from the mounting cylinder.
According to a deep coal seam slitting fracturing and permeability enhancement device as described in claim 1, it is characterized in that the accommodating and limiting assembly includes a mounting tube, an outer tube wall of which is close to one end of the slitting assembly and is provided with a accommodating groove, and an inner tube wall of which is close to one end of the slitting assembly and is provided with a docking ring, and a limiting stop frame fixed to the inner tube wall of the mounting tube is also provided on the inner side of the docking ring.
The deep coal seam slit fracturing and permeability enhancement device according to claim 1 is characterized in that the energy enhancement component comprises:

The installation cylinder 3 has a docking ring 2 fixed on the inner cylinder wall of the installation cylinder 3 close to one end of the slotting assembly;

The telescopic slide has one end connected to the inner wall of the mounting tube 3 located inside the docking ring 2, and the other end connected to the inner wall of the mounting tube 3 located inside the docking ring 2. A mounting shaft is coaxially fixed at one end, and two ends of the mounting shaft are respectively fixed with a guide cone cylinder 1 and a guide cone cylinder 2 with openings facing each other, and the cone walls of the guide cone cylinder 1 and the guide cone cylinder 2 are respectively provided with a guide port 1 and a guide port 2; and

An energy-enhancing spoiler frame is installed in cooperation with the installation shaft rod, the first guide cone and the second guide cone.
The deep coal seam slit fracturing and permeability enhancement device according to claim 3 is characterized in that the energy enhancement baffle frame comprises:

The second rotating ring is rotatably mounted on both ends of the mounting shaft, and a guide rod is fixed between the facing ring surfaces of the two sets of the second rotating rings;

The spoiler is sleeved on the mounting shaft rod and the guide rod and is slidably connected. The two side ends of the axial middle part are respectively connected with connecting springs. The outer ring surface is provided with an inverted trapezoidal clamping ring that can be engaged with the end of the telescopic trapezoidal head. The other ends of the connecting springs on both sides are respectively connected with the two ring surfaces of the rotating ring on both sides, and the two side ends of the middle part of the spoiler are also fixed with long cylindrical rings.

A flow control frame is installed on an inner wall of the guide cone;

The shrinking ring is installed on the second outer cylinder wall of the guide cone cylinder, and a groove is opened inside the shrinking ring, and a telescopic butt joint is arranged in the groove.
According to the deep coal seam slitting fracturing and permeability enhancement device described in claim 4, it is characterized in that the baffle plate is fixed with baffle blades on the outer wall of the long cylindrical ring on one side of the guide cone.
According to claim 4, a deep coal seam fracturing and permeability enhancement device is characterized in that the flow control frame includes a mounting ring, on the inner ring wall of which a hinge head that can swing along the axial plane is rotatably mounted, and multiple groups are evenly distributed in a circle, a short rotating shaft is rotatably mounted on the lower end of the hinge head, and the lower end of the short rotating shaft is fixedly connected to the outer arc surface end of the fan-shaped plate, and reinforcing ribs are fixed on both side surfaces of the fan-shaped plate, and the two groups of reinforcing ribs are respectively deviated from the center line of the fan-shaped plate and are arranged back to back, and both sides of the hinge head are also provided with pulling elastic parts connected to the inner wall of the mounting ring, and the other ends of the pulling elastic parts on both sides are respectively connected to the reinforcing ribs on both sides.
According to a deep coal seam fracturing and permeability enhancement device as described in claim 3, it is characterized in that the end of the mounting shaft rod close to one end of the telescopic slide is also connected to a wire rope that penetrates and is introduced into the guide pipe.