CN-121993204-A - High-pressure hydraulic cutting and pressing integrated roof pressure relief method for coal mine

CN121993204ACN 121993204 ACN121993204 ACN 121993204ACN-121993204-A

Abstract

The invention provides a high-pressure hydraulic cutting and pressing integrated roof pressure relief method for a coal mine. A high-pressure hydraulic cutting and pressing integrated roof pressure relief method for a coal mine comprises the following steps of S1, determining a key layer position of a roof stratum according to lithology characteristics of a roof and a floor of a working face, S2, determining drilling construction parameters according to the key layer position arrangement of the roof stratum, S3, determining hydraulic cutting and pressing specific technical parameters according to physical mechanical parameters of the roof and the floor, S4, carrying out equipment selection according to the technical parameters, and carrying out cutting and pressing integrated process, and S5, adopting monitoring equipment to monitor cutting and pressing effects. The invention provides a high-pressure hydraulic cutting-pressing integrated roof pressure relief method for a coal mine, which is characterized in that a slotting process and a fracturing process are connected in series, the slotting process is performed firstly, then the fracturing process is performed, a jet slotting process generates cracks in advance, the fracturing expands the cracks, the accurate pressure relief control of a hard roof of the coal mine is improved, the occurrence of coupling disasters such as rock burst, fire, gas and the like is prevented, the repeated cutting-pressing process of one-time drilling is realized, and the complex degree of the process is reduced.

Inventors

WANG YUHAO
Ai biao
WU PANFEI
LU YANGQIAN
FAN QILONG
LI HAOCHENG
LV WEIWEI
ZHOU MENGYING

Assignees

陕西太合智能钻探有限公司

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (10)

1. The high-pressure hydraulic cutting and pressing integrated roof pressure relief method for the coal mine is characterized by comprising the following steps of: S1, determining a key layer position of a roof stratum according to lithology characteristics of a top plate and a bottom plate of a working surface; And S2, determining drilling construction parameters according to the key layer laminated arrangement of the top plate. S3, according to physical and mechanical parameters of the top plate and the bottom plate, hydraulic slotting and fracturing specific technical parameters; S4, performing equipment selection according to technical parameters, and implementing a cutting and pressing integrated process; And S5, monitoring the cutting pressure effect by adopting monitoring equipment.
2. The method for relieving pressure of a high-pressure hydraulic cutting and pressing integrated roof for a coal mine is characterized in that in the step S1, roof rock core sampling is carried out, a roof lithology specific physical and mechanical parameter test is carried out, the roof lithology characteristics of a working face are determined, a main key layer and a secondary key layer are divided, and the positions of key layers needing to be cut and pressed are judged.
3. The method for pressure relief of a high-pressure hydraulic cutting and pressing integrated roof for a coal mine according to claim 1, wherein in the step S2, drilling construction parameters including drilling angle and drilling depth are determined according to the key layer position of the roof stratum and the actual condition of a down-hole roadway.
4. The method for pressure relief of a high-pressure hydraulic cutting and pressing integrated roof for a coal mine according to claim 1, wherein in the step S3, the technical parameters of hydraulic cutting and hydraulic fracturing are determined according to the test result of the physical and mechanical parameters of the roof lithology.
5. The method for relieving pressure of a high-pressure hydraulic cutting and pressing integrated roof for a coal mine according to claim 1, wherein in the step S5, the cutting and pressing effect is monitored according to monitoring equipment, and the specific application effects of hydraulic cutting and pressing are determined.
6. The high-pressure hydraulic cutting and pressing integrated roof pressure relief method for the coal mine, which is disclosed in claim 1, is characterized in that a construction device is needed in the cutting and pressing integrated roof pressure relief process in the step S4 of the high-pressure hydraulic cutting and pressing integrated roof pressure relief method for the coal mine, and the construction device comprises a high-pressure water injection pump, a drilling machine, a mechanical ball injector, a hydraulic slotting device, a packer and a drill hole; The water tank, one side of water tank is provided with water inlet pipeline, water inlet pipeline's one end fixed connection in one side of high-pressure water injection pump, one side of high-pressure water injection pump is provided with water outlet pipeline, water outlet pipeline's one end set up in the surface of rig.
7. The method for pressure relief of the high-pressure hydraulic cutting and pressing integrated roof for the coal mine according to claim 6, wherein the hydraulic cutting device is arranged on one side of the surface of the water outlet pipeline, a high-pressure sealing drill rod is arranged on one side of the surface of the drilling machine, the mechanical ball throwing device is arranged on one side of the high-pressure sealing drill rod, and the packer is arranged at one end of the high-pressure sealing drill rod.
8. The method for relieving pressure of the high-pressure hydraulic cutting and pressing integrated roof for the coal mine as claimed in claim 6, wherein the two sides of the inside of the drill hole are provided with slots, and one side of each slot is provided with a fracturing fracture.
9. The method for pressure relief of a high-pressure hydraulic cutting and pressing integrated roof for a coal mine according to claim 6, wherein the mechanical ball injector comprises a fracturing ball, a movable slide block, a cutting nozzle, cutting springs and a shell, wherein the two cutting springs are respectively arranged on two sides of an inner cavity wall of the shell, the movable slide block is arranged at one end of the cutting springs, the fracturing ball is arranged between the two movable slide blocks, and the two cutting nozzles are respectively arranged on two sides of the outer surface of the shell.
10. The method for pressure relief of a high-pressure hydraulic cutting and pressing integrated roof for a coal mine according to claim 6, wherein the hydraulic cutting and pressing integrated roof for a coal mine comprises a sliding rod, a pressure spring, a pressure relief port, a clamping spring and an installation shell, the sliding rod is slidably installed in the middle of the inside of the installation shell, the pressure spring is sleeved on one side of the outer surface of the sliding rod, the two pressure relief ports are respectively formed in two sides of the outer surface of the installation shell, and the two clamping springs are respectively arranged on the other two sides of the outer surface of the installation shell.

Description

High-pressure hydraulic cutting and pressing integrated roof pressure relief method for coal mine Technical Field The invention relates to the field of hydraulic slotting, in particular to a high-pressure hydraulic cutting and pressing integrated roof pressure relief method for a coal mine. Background In recent years, along with the deep mining of shallow coal resources, the technical maturity is improved, and further the deep mining of coal mines is turned to, but the working conditions faced in the mining process are more and more complicated, especially the life safety of mine workers is seriously threatened by combining deep rock burst with multiple coupling disasters, often the occurrence of rock burst is not only a disaster, such as fire disaster, coal seam protrusion and gas emission accompanied with rock burst, a composite disaster is formed, serious deformation of a roadway is caused, equipment damage and rapid increase of gas concentration are caused, fire explosion is caused, a large number of casualties are caused, and the control of only one disaster aiming at the rock burst is not feasible, and a technical method for jointly controlling the rock burst composite disaster by combining multiple disasters is needed. In order to solve a series of problems caused by rock burst, a large number of researches on rock burst and composite disaster prevention and control are developed, and the researches mainly comprise hydraulic slotting, hydraulic fracturing, water injection weakening and the like. The high-pressure water jet slotting technology and the hydraulic fracturing technology are used as main technical means for preventing and controlling the rock burst of the current gas extraction and roof, but have certain limitations in the field practical application process, and aiming at the high-pressure hydraulic slotting, the coal pressure relief is sufficient in the cutting range, the permeability increasing effect is obvious, but the influence radius is small, meanwhile, the slotting effect is not obvious for high-gas low-permeability coal seams and rock strata, the control range of hydraulic fracturing is large, the influence radius can reach tens of meters, but the problems in the crack expanding direction and the like are difficult to ensure. Therefore, it is necessary to provide a high-pressure hydraulic cutting and pressing integrated roof pressure relief method for coal mines, which solves the technical problems. Disclosure of Invention The invention provides a high-pressure hydraulic cutting and pressing integrated roof pressure relief method for a coal mine, which solves the problems that only one disaster of rock burst is prevented and treated and the composite disaster of the rock burst cannot be solved in the prior art. In order to solve the technical problems, the invention provides a high-pressure hydraulic cutting and pressing integrated roof pressure relief method for a coal mine, which comprises the following steps: S1, determining a key layer position of a roof stratum according to lithology characteristics of a top plate and a bottom plate of a working surface; S2, determining drilling construction parameters according to the key layer laminated arrangement of the top plate; S3, according to physical and mechanical parameters of the top plate and the bottom plate, hydraulic slotting and fracturing specific technical parameters; S4, performing equipment selection according to technical parameters, and implementing a cutting and pressing integrated process; And S5, monitoring the cutting pressure effect by adopting monitoring equipment. Preferably, in the step S1, a roof rock core sampling is performed, a roof lithology specific physical and mechanical parameter test is performed, a roof lithology characteristic of the working face is determined, a main key layer and a secondary key layer are divided, and a key layer position requiring slotting and fracturing is judged. Preferably, in the step S2, drilling construction parameters including a drilling angle and a drilling depth are determined according to the key layer position of the roof strata and the actual situation of the underground roadway. Preferably, in the step S3, the technical parameters of hydraulic slotting and hydraulic fracturing are determined according to the test result of the physical and mechanical parameters of the roof lithology. Preferably, in the step S5, the cutting pressure effect is monitored according to the monitoring device, and the specific application effects of the hydraulic cutting and hydraulic fracturing are determined. Preferably, a construction device is needed to be used in the cutting and pressing integrated process in the S4 step of the high-pressure hydraulic cutting and pressing integrated roof pressure relief method for the coal mine, and the construction device comprises a high-pressure water injection pump, a drilling machine, a mechanical ball injector, a hydraulic slotting device, a pa