CN113356849B - A device for controlling mining roadway retention based on hydraulic fracturing pressure relief - Google Patents

Abstract

The invention discloses a device for controlling backing roadway retention based on hydraulic fracturing pressure relief, which relates to the technical field of coal mine roadway retention, including high-pressure pumps, fracturing pipes, packing components and drilling holes, wherein a plurality of the drilling Holes are opened obliquely in the coal seam and rock formation through the drill bit, and a plurality of the drill holes are distributed along the length direction of the mining roadway, and a plurality of fracturing grooves are opened at equal intervals in the plurality of drill holes. A plurality of pack-off assemblies are arranged at equal intervals, and the plurality of pack-off assemblies are spaced apart from the plurality of fracturing tanks, and fracturing pipes are coaxially sleeved in the plurality of pack-off assemblies, and the Both ends of the fracturing pipe are sleeved with plugs, and the plugs are located in the borehole, one end of the fracturing pipe extends out of the borehole and is connected with a high-pressure pump, and the high-pressure pump is arranged in the mining roadway Inside. The invention can provide a sealed environment for hydraulic fracturing pressure relief through the packing component, and effectively prevent water pressure from leaking.

Description

A device for controlling mining roadway retention based on hydraulic fracturing pressure relief

technical field

The invention relates to the technical field of coal mine roadway retention, in particular to a device for controlling mining roadway retention based on hydraulic fracturing pressure relief.

Background technique

Coal mines are generally divided into underground coal mines and open-pit coal mines. When the coal seam is far away from the surface, it is generally selected to dig underground roadways to mine coal. In order to make the mining roadway more stable, blasting and hydraulic fracturing pressure relief are generally used to reduce the stress on the mining roadway, thereby improving the safety of the mining roadway.

The existing hydraulic fracturing pressure relief cannot accurately distribute the fracturing intervals equidistantly during fracturing, so that the fracturing of the rock formation is uneven, resulting in the inability to effectively reduce the stress on the mining roadway, and through sealing When the packer separates the fracturing interval, it cannot adjust the pressure of the packer on the inner wall of the borehole, resulting in damage to the borehole and reducing the service life of the packer.

In view of the above problems, the present invention provides a device for controlling mining roadway retention based on hydraulic fracturing pressure relief, so as to solve the above problems.

Contents of the invention

In order to achieve the above object, the present invention provides the following technical solution: a device for controlling recovery roadway retention based on hydraulic fracturing pressure relief, including a high-pressure pump, a fracturing pipe, a packing assembly and a drill hole, wherein a plurality of said The drill holes are obliquely opened in the coal seam and the rock formation through the drill bit, and a plurality of the drill holes are distributed along the length direction of the mining roadway;

A plurality of fracturing grooves are arranged at equal intervals in the plurality of boreholes, and a plurality of pack-off assemblies are arranged at equal intervals in the boreholes, and the plurality of pack-off assemblies and the plurality of fracturing Slot interval setting;

A fracturing tube is coaxially sleeved in the plurality of pack-off components, and both ends of the fracturing tube are sleeved with plugs, and the plugs are located in the borehole, and the fracturing tube One end of the drill protrudes from the borehole and is connected with a high-pressure pump, which is set in the recovery roadway.

Further, preferably, a positioning groove is provided between the plurality of fracturing grooves, and the depth of the positioning groove is smaller than the depth of the fracturing groove, and the plurality of packing components are connected to the positioning groove. correspond.

Further, preferably, the fracturing pipe is provided with a plurality of fracturing openings at equal intervals, and the plurality of fracturing openings correspond to the fracturing grooves, and filter screens are fixed on the plurality of fracturing openings, Used to prevent rock from entering the frac tubing.

Further, preferably, the isolation assembly includes a sealing cylinder, a rubber member, a stopper assembly and a rubber hose, wherein the sealing cylinder is sleeved on the fracturing pipe, and both ends of the sealing cylinder are circumferentially arranged There are multiple limiting components, rubber parts are fixed between the multiple limiting components, and a sealed pressure chamber is formed between the rubber parts, the sealing cylinder and the limiting components;

A rubber hose is provided through one side of the sealing cylinder, and the rubber hose is arranged to avoid a plurality of the limiting components, and the end of the rubber hose close to the high-pressure pump is connected with a pressure control device.

Further, preferably, the rubber hose is provided with a plurality of pressure holes, and the plurality of pressure holes are all located in the pressure chamber for providing pressure to the pressure chamber so as to deform the rubber parts.

Further, preferably, a plurality of positioning columns are arranged around the middle position of the outer wall of the rubber member, and the plurality of positioning columns have a trapezoidal structure, and the plurality of positioning columns can position the packing assembly through the positioning grooves.

Further, preferably, the limiting assembly includes a pressure limiting member, a pressure spring, a limiting plate, a side wall and an anchor fluke assembly, wherein the pressure limiting member is slidably arranged on a side of the sealing cylinder close to the fracturing tube. Inside the side, a pressure spring is arranged between the pressure limiting member and the sealing cylinder;

A plurality of side walls are arranged around the side of the sealing cylinder away from the fracturing tube, and a limiting plate is slidably arranged in the plurality of side walls through a sliding column, and the limiting plate is close to the side of the pressure limiting member The connecting piece is connected with the pressure limiting piece, and the top ends of the multiple side walls are slidably provided with anchor fluke assemblies.

Further, preferably, a contact sensor is arranged coaxially at the middle position of the pressure spring, and the contact sensor is fixed on the sealing cylinder.

Further, preferably, the fluke assembly includes a fluke and a tension spring, wherein the fluke is slidably arranged in the side wall, and a plurality of tension springs are arranged between the fluke and the side wall, Used to reset the fluke.

Further, preferably, the fluke is provided with a guide surface on a side close to the limiting plate, and the fluke can push the guiding surface through the sliding of the limiting plate, so that the fluke slides upwards, and the fluke The top end is an arc-shaped surface, which can make it fit the inner wall of the borehole, and the arc-shaped surface is fixed with a plurality of anti-slip recesses.

Compared with the prior art, the present invention provides a device for controlling mining roadway retention based on hydraulic fracturing pressure relief, which has the following beneficial effects:

In the present invention, positioning grooves are provided between the fracturing grooves in the borehole, so that the position of the packing assembly can be accurately positioned, thereby ensuring that the lengths between each fracturing groove are the same, so that each fracturing groove The pressure on the grooves is the same, which improves the effect of fracturing, so that the pressure can be relieved better. The rubber part of the packing component is provided with a positioning column, which can position the packing component. The injection pressure can deform the rubber part so that it can be in contact with the drill hole for sealing and preliminary fixing. The fracturing tank is fractured by the fracturing liquid in the fracturing tube. During fracturing, the pressure limiting part passes through The fracturing fluid slides, thereby driving the limiting plate to slide, and the anchor fluke slides to the drilling hole through the limiting plate, further fixing the packing assembly, and when the pressure of the fracturing fluid increases, the anchor fluke will The greater the pressure of the drill hole, so that it can change with the pressure of the fracturing fluid, which improves the isolation effect of the isolation component. When the pressure limiting member contacts the contact sensor, the fracturing fluid in the drill hole will When the pressure reaches the threshold value, it enters the pressure maintaining stage, which prevents the sealing components from being damaged due to excessive pressure.

Description of drawings

Fig. 1 is a kind of overall schematic diagram of the device for controlling mining roadway retention based on hydraulic fracturing pressure relief;

Fig. 2 is an enlarged schematic diagram at A of a device for controlling recovery roadway retention based on hydraulic fracturing pressure relief;

Fig. 3 is a schematic diagram of a pack-off component of a device for controlling recovery roadway retaining based on hydraulic fracturing pressure relief;

Fig. 4 is a schematic diagram of a limit assembly of a device for controlling mining roadway retaining based on hydraulic fracturing pressure relief;

In the figure: 1. mining roadway; 2. high-pressure pump; 3. fracturing pipe; 31. fracturing opening; 4. coal seam; 5. rock formation; 51. positioning groove; 52. fracturing groove; 6. packing assembly; 61. Sealing cylinder; 62. Rubber parts; 63. Positioning column; 64. Pressure chamber; 65. Limit component; 651. Pressure limiting member; 652. Pressure spring; 653. Contact sensor; 654. Connector; 655 656, anchor claw; 6561, guide surface; 6562, anti-skid boss; 657, tension spring; 658, side wall; 659, sliding post; 66, rubber hose; 7, drilling.

Detailed ways

Referring to Figures 1 to 4, the present invention provides a technical solution: a device for controlling recovery roadway retention based on hydraulic fracturing pressure relief, including a high-pressure pump 2, a fracturing pipe 3, a packing assembly 6 and a drill hole 7, wherein A plurality of boreholes 7 are obliquely opened in the coal seam 4 and rock formation 5 through the drill bit, and the plurality of boreholes 7 are distributed along the length direction of the mining roadway 1;

A plurality of fracturing grooves 52 are arranged at equal intervals in the plurality of boreholes 7, and a plurality of packing assemblies 6 are also arranged at equal intervals in the boreholes 7, and the plurality of packing assemblies 6 and the multiple The fracturing grooves 52 are arranged at intervals;

A fracturing tube 3 is coaxially sleeved in the multiple pack-off components 6, and both ends of the fracturing tube 3 are sleeved with plugs, and the plugs are located in the borehole 7, so that One end of the above-mentioned fracturing pipe 3 protrudes from the borehole 7 and is connected with the high-pressure pump 2 , and the high-pressure pump 2 is arranged in the mining roadway 1 .

In this embodiment, a positioning groove 51 is provided between the multiple fracturing grooves 52, and the depth of the positioning groove 51 is smaller than the depth of the fracturing grooves 52, and the plurality of the packing The component 6 corresponds to the positioning groove 51, that is to say, the packing component 6 can be precisely positioned through the positioning groove 51, thereby ensuring that the length between each fracturing groove 52 is the same, so that each fracturing groove 52 The received pressure is the same, which improves the pressure relief effect.

In this embodiment, the fracturing tube 3 is equidistantly provided with a plurality of fracturing openings 31, and the plurality of fracturing openings 31 correspond to the fracturing grooves 52, and the plurality of fracturing openings 31 correspond to the fracturing grooves 52. 31 is fixed with a filter screen to prevent rocks from entering the fracturing pipe 3, that is to say, when the fracturing fluid is discharged from the fracturing port 31, the entry of rocks can be restricted through the filter screen, thereby preventing the fracturing Blockage of tube 3.

As a preferred embodiment, the packing assembly 6 includes a sealing cylinder 61, a rubber member 62, a limiting assembly 65 and a rubber hose 66, wherein the sealing cylinder 61 is sleeved on the fracturing tube 3, and the Both ends of the sealing cylinder 61 are provided with a plurality of limiting components 65 on the circumference, rubber parts 62 are fixed between the plurality of limiting components 65, and the rubber parts 62, the sealing cylinder 61 and the limiting components 65 to form a sealed pressure chamber 64;

One side of the sealing cylinder 61 is penetrated with a rubber tube 66 , and the rubber tube 66 is set away from the plurality of limit assemblies 65 , and the end of the rubber tube 66 close to the high-pressure pump 2 is connected with a pressure control device.

As a preferred embodiment, the rubber hose 66 is provided with a plurality of pressure holes, and the plurality of pressure holes are all located in the pressure chamber 64 to provide pressure for the pressure chamber 64, so that the rubber part 62 It should be noted that the pressure inside the hose 66 gradually increases with the injection of fracturing fluid, so that the rubber part 62 is always in contact with the borehole 7, and the sealing effect is improved.

As a preferred embodiment, the middle position of the outer wall of the rubber member 62 is provided with a plurality of positioning columns 63 around the circumference, and the plurality of positioning columns 63 is a trapezoidal structure, and the plurality of positioning columns 63 can pass through the positioning groove 51 To position the packing assembly 6, that is to say, the trapezoidal positioning column 63 can slightly guide the packing assembly 6, so that the position of the packing assembly 6 can be more precise.

As a preferred embodiment, the limiting assembly 65 includes a pressure limiting member 651, a pressure spring 652, a limiting plate 655, a side wall 658 and an anchor fluke assembly, wherein the pressure limiting member 651 is slidably arranged on the seal Inside the cylinder 61 near the side of the fracturing tube 3, a pressure spring 652 is arranged between the pressure limiting member 651 and the sealing cylinder 61;

A plurality of side walls 658 are arranged around the side of the sealing cylinder 61 away from the fracturing tube 3 , and a limiting plate 655 is slidably arranged in the plurality of side walls 658 through a sliding column 659 , and the limiting plate 655 A side close to the pressure limiting member 651 is connected to the pressure limiting member 651 through a connecting member 654 , and the top ends of the multiple side walls 658 are slidably provided with anchor fluke assemblies.

As a preferred embodiment, the middle position of the pressure spring 652 is coaxially provided with a contact sensor 653, and the contact sensor 653 is fixed on the sealing cylinder 61. It should be noted that when the pressure limiting member 651 is in contact with When the sensor 653 is in contact, the pressure of the fracturing fluid in the borehole 7 reaches the threshold and enters the pressure maintaining stage, which prevents the damage of the packing assembly 6 .

As a preferred embodiment, the fluke assembly includes a fluke 656 and a tension spring 657, wherein the fluke 656 is slidably arranged in the side wall 658, and between the fluke 656 and the side wall 658 A plurality of tension springs 657 are provided for resetting the fluke 656 .

As a preferred embodiment, the fluke 656 is provided with a guide surface 6561 on the side close to the limiting plate 655, and the fluke 656 can push the guiding surface 6561 through the sliding of the limiting plate 655, so that the fluke 656 Sliding upwards, and the top end of the anchor fluke 656 is an arc surface, which can make it fit the inner wall of the borehole, and a plurality of anti-skid recesses 6562 are fixed on the arc surface.

Specifically, positioning grooves 51 are provided between the fracturing grooves 52 in the borehole 7 by the drill bit, so that the position of the packing assembly 6 can be accurately positioned, thereby ensuring that the lengths between each fracturing groove 52 are the same, So that the pressure on the fracturing tank 52 is the same, the fracturing tube 3 and a plurality of pack-off assemblies 6 are sequentially sent into the borehole 7, and the pack-off assembly is sealed by the positioning column 63 provided on the rubber part 62 of the pack-off assembly 6 6 for positioning, and then inject pressure into the pressure chamber 64 through the rubber hose 66 to deform the rubber part 62 so that it contacts the borehole 7 for sealing and preliminary fixing, and then injects pressure into the fracturing tube 3 through the high-pressure pump 2 The fracturing liquid flows into the packing assembly 6 through the fracturing port 31, and fracturing the fracturing groove 52. During the fracturing, the pressure limiting member 651 slides through the fracturing liquid, thereby driving the limiting plate 655 to perform fracturing. sliding, the fluke 656 slides toward the borehole 7 through the limiting plate 655, further fixing the packing assembly 6, and, when the pressure of the fracturing fluid increases, the pressure of the fluke 656 on the borehole 7 increases , so that it can change with the pressure of the fracturing fluid, improving the sealing degree of the packing assembly 6. When the pressure limiting member 651 is in contact with the contact sensor 653, the pressure of the fracturing fluid in the borehole 7 reaches The threshold value enters the pressure maintaining stage, which prevents the packer assembly 6 from being damaged due to excessive pressure. Finally, after the fracturing is completed, the fracturing liquid is discharged through the fracturing port 31 to complete the pressure relief of the mining roadway.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technology of the present invention Any equivalent replacement or change of the scheme and its inventive concepts shall fall within the protection scope of the present invention.

Claims (6)

1. The utility model provides a device based on hydraulic fracturing release control stope drift, includes high-pressure pump (2), fracturing pipe (3), seals and separates subassembly (6) and drilling (7), wherein, a plurality of drilling (7) are seted up in coal seam (4) and stratum (5) through the drill bit slope, and, a plurality of drilling (7) are along the length direction distribution of stope drift (1), its characterized in that:

a plurality of fracturing grooves (52) are formed in the plurality of drilling holes (7) at equal intervals, a plurality of packing assemblies (6) are also arranged in the drilling holes (7) at equal intervals, and the plurality of packing assemblies (6) are arranged at intervals with the plurality of fracturing grooves (52);

the fracturing pipes (3) are coaxially sleeved in the packing assemblies (6), plugs are sleeved at two ends of each fracturing pipe (3), the plugs are located in the drilling holes (7), one ends of the fracturing pipes (3) extend out of the drilling holes (7) and are connected with the high-pressure pumps (2), and the high-pressure pumps (2) are arranged in the stoping roadway (1);

a positioning groove (51) is formed among the plurality of fracturing grooves (52), the depth of the positioning groove (51) is smaller than that of the fracturing grooves (52), and the plurality of packing components (6) correspond to the positioning groove (51);

the packing assembly (6) comprises a sealing cylinder (61), rubber pieces (62), limiting assemblies (65) and a rubber pipe (66), wherein the sealing cylinder (61) is sleeved on a fracturing pipe (3), a plurality of limiting assemblies (65) are circumferentially distributed at two ends of the sealing cylinder (61), the rubber pieces (62) are fixed between the limiting assemblies (65), and a sealed pressure bin (64) is formed among the rubber pieces (62), the sealing cylinder (61) and the limiting assemblies (65);

a rubber tube (66) is arranged in the pressure bin (64) at one side of the sealing cylinder (61) in a penetrating manner, the rubber tube (66) is arranged avoiding a plurality of limiting assemblies (65), and one end, close to the high-pressure pump (2), of the rubber tube (66) is connected with a pressure control device;

the limiting assembly (65) comprises a limiting piece (651), a pressure spring (652), a limiting plate (655), a side wall (658) and a fluke assembly, wherein the limiting piece (651) is slidably arranged inside one side of the sealing cylinder (61) close to the fracturing pipe (3), and the pressure spring (652) is arranged between the limiting piece (651) and the sealing cylinder (61);

a plurality of side walls (658) are circumferentially distributed on one side, far away from the fracturing pipe (3), of the sealing cylinder (61), limiting plates (655) are slidably arranged in the side walls (658) through sliding columns (659), one side, close to the limiting piece (651), of each limiting plate (655) is connected with the limiting piece (651) through a connecting piece (654), and fluke components are slidably arranged in the top ends of the side walls (658);

the fluke assembly comprises a fluke (656) and a tension spring (657), wherein the fluke (656) is slidably arranged in a side wall (658), and a plurality of tension springs (657) are arranged between the fluke (656) and the side wall (658) and used for resetting the fluke (656).

2. The device for controlling the retention of a mining roadway based on hydraulic fracturing pressure relief according to claim 1, wherein the device comprises: a plurality of fracturing openings (31) are formed in the fracturing pipe (3) at equal intervals, the fracturing openings (31) correspond to the fracturing grooves (52), and a plurality of filter screens are fixed on the fracturing openings (31) and used for preventing rocks from entering the fracturing pipe (3).

3. The device for controlling the retention of a mining roadway based on hydraulic fracturing pressure relief according to claim 1, wherein the device comprises: the rubber tube (66) is provided with a plurality of pressure holes, and the pressure holes are all positioned in the pressure bin (64) and used for providing pressure for the pressure bin (64) so as to deform the rubber piece (62).

4. The device for controlling the retention of a mining roadway based on hydraulic fracturing pressure relief according to claim 1, wherein the device comprises: a plurality of positioning columns (63) are circumferentially distributed at the middle position of the outer wall of the rubber piece (62), the positioning columns (63) are of trapezoid structures, and the positioning columns (63) can position the packing assembly (6) through positioning grooves (51).

5. The device for controlling the retention of a mining roadway based on hydraulic fracturing pressure relief according to claim 1, wherein the device comprises: a contact sensor (653) is coaxially arranged in the middle of the pressure spring (652), and the contact sensor (653) is fixed on the sealing cylinder (61).

6. The device for controlling the retention of a mining roadway based on hydraulic fracturing pressure relief according to claim 1, wherein the device comprises: the utility model discloses a drilling device, including anchor claw (656), locating plate (655), guide surface (6561) are equipped with to one side that is close to anchor claw (656), anchor claw (656) can promote guide surface (6561) through the slip of locating plate (655) to make anchor claw (656) upwards slide, and, the top of anchor claw (656) is the arcwall face, can make its laminating drilling inner wall, and be fixed with a plurality of anti-skidding concave stations (6562) on the arcwall face.