End hydraulic fracturing top cutting method and device and medium

Abstract

The invention relates to the technical field of fracturing top cutting, and discloses an end hydraulic fracturing top cutting method and device and a medium, and the method comprises the steps that a top plate of a coal mine tunnel is drilled according to the preset depth, angle and distance between drill holes, and a top plate drill hole is obtained; fracturing parameters are set according to the top plate drill hole, a working face hydraulic system is used for conducting drill hole fracturing according to the fracturing parameters, and drill hole environment parameters during drill hole fracturing are detected; and based on the drilling environment parameters, drilling fracturing control is conducted on the top plate drilling holes till fracturing of all the top plate drilling holes of the top plate is completed. According to the method, additional allocation, carrying and debugging of the special high-pressure pump station can be avoided, and the end hydraulic fracturing top cutting efficiency is improved. And drilling and fracturing control is carried out through drilling environment parameters during drilling and fracturing, so that the safety of hydrofracture top cutting of the end is improved.

Description

Technical Field

[0001] This invention relates to the field of fracturing and top cutting technology, specifically to a method, equipment, and medium for end-point hydraulic fracturing and top cutting. Background Technology

[0002] During the longwall mining process in coal mines, the overlying strata at the face end and the stop line area form a suspended roof structure, which is the core problem that causes strong mine pressure, severe roadway deformation, and even threatens the safe withdrawal of equipment. Hydraulic fracturing at the face end is a targeted and efficient solution.

[0003] While existing hydraulic fracturing methods, such as blasting pre-fracturing or conventional hydraulic fracturing, have some effectiveness, they also have significant limitations. For example, blasting pre-fracturing is highly dangerous and has poor controllability under complex geological conditions; while conventional hydraulic fracturing typically relies on dedicated high-pressure water pump station systems, requiring additional dedicated high-pressure pump station equipment. This necessitates frequent on-site equipment handling, installation, and commissioning, increasing not only the complexity and time cost of the operation but also introducing significant safety risks due to the need to lay extremely long high-pressure pipelines.

[0004] Therefore, improving the efficiency and safety of hydraulic fracturing at the top of the vessel has become an urgent problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to perform hydraulic fracturing and top cutting at the end of the shaft efficiently and safely.

[0006] The present invention solves the above-mentioned technical problems through the following technical means: This invention provides a method for cutting the top of hydraulic fracturing at the end of the shaft, characterized in that it includes: Drill holes in the roof of the coal mine roadway according to the preset depth, angle and spacing between the holes to obtain roof boreholes; The fracturing parameters are set according to the top plate borehole, and the working face hydraulic system is used to perform drilling fracturing on the top plate borehole according to the fracturing parameters, and the drilling environment parameters during drilling fracturing are detected. Based on the drilling environment parameters, the drilling fracturing of the top plate holes is controlled until the fracturing of all the top plate holes is completed.

[0007] The present invention also provides a processing device, characterized in that it includes at least one processor and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor can execute the above-described method of hydraulic fracturing and cutting the top by calling the program instructions.

[0008] The present invention also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, the computer instructions causing the computer to execute the above-described end-head hydraulic fracturing and top-cutting method.

[0009] The advantages of this invention are: This invention utilizes the hydraulic system at the working face as the high-pressure water source for hydraulic fracturing at the end point. This achieves "local sourcing" of the fracturing power system, completely avoiding the separate allocation, transportation, and commissioning of dedicated high-pressure pump stations, and improving the efficiency of hydraulic fracturing at the end point. Furthermore, by controlling the drilling fracturing through drilling environment parameters, it avoids safety hazards such as leakage and pipe bursts caused by using ultra-long high-pressure pipelines, thus improving the safety of hydraulic fracturing at the end point. Attached Figure Description

[0010] Figure 1 This is a schematic flowchart of a hydraulic fracturing and top-cutting method for the end of an embodiment of the present invention; Figure 2 This is a schematic diagram of the arrangement of the end hydraulic fracturing control borehole in one embodiment of the present invention. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] Reference Figure 1 The diagram shown is a schematic flowchart of a hydraulic fracturing top-cutting method according to an embodiment of the present invention. In this embodiment, the hydraulic fracturing top-cutting method includes: S1. Drill holes in the roof of the coal mine roadway according to the preset depth, angle and spacing between holes to obtain roof boreholes.

[0013] In this embodiment of the invention, for example, the preset drilling depth is 12m, the drilling angle is vertically upward, and the hole spacing is 5-10m. Drilling is performed on the roof of a coal mine roadway to generate multiple roof holes with a diameter of 42mm. Figure 2 As shown.

[0014] S1. Set the fracturing parameters according to the top plate drilling, use the working face hydraulic system to perform drilling fracturing on the top plate drilling according to the fracturing parameters, and detect the drilling environment parameters during drilling fracturing.

[0015] In this embodiment of the invention, the fracturing parameters are as follows: the fracturing range is from 5m from the borehole opening to the designed borehole depth; the hydraulic system pressure at the working face is, for example, a working face emulsification pump hydraulic system, 26MPa-30MPa; fracturing is performed after drilling is completed, every 5-10m; the length of the fracturing section is adjusted according to the hardness of the sandstone. In detail, the borehole environment parameters include pressure gauge readings and water inflow from nearby boreholes. These parameters may also include: using hydraulic fracturing to measure geostress and assess the stress field; using borehole imaging to observe fracture development; using a cross-shaped sampling method to monitor roadway surface displacement; using anchor cable stress gauges to monitor anchor cable axial force; and monitoring the working resistance of hydraulic supports within the roof cutting and depressurization range to determine the periodic pressure step distance and dynamic load coefficient.

[0016] S3. Based on the drilling environment parameters, perform drilling fracturing control on the top plate boreholes until fracturing of all top plate boreholes is completed.

[0017] In this embodiment of the invention, borehole fracturing control involves stopping the fracturing operation if the water flow from an adjacent borehole is very high and the pressure gauge reading suddenly drops. Furthermore, during a fracturing operation, if water flows out from a nearby anchor cable, fracturing in that borehole must be stopped. Simultaneously, safety monitoring is conducted based on borehole environmental parameters until fracturing is completed at all borehole locations in the roof, thereby cutting off the roof and causing it to collapse.

[0018] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for hydraulic fracturing and top cutting at the end of a hydraulic fracturing vessel, characterized in that, include: Drill holes in the roof of the coal mine roadway according to the preset depth, angle and spacing between the holes to obtain roof boreholes; The fracturing parameters are set according to the top plate borehole, and the working face hydraulic system is used to perform drilling fracturing on the top plate borehole according to the fracturing parameters, and the drilling environment parameters during drilling fracturing are detected. Based on the drilling environment parameters, the drilling fracturing of the top plate holes is controlled until the fracturing of all the top plate holes is completed.

2. A processing device, characterized in that, It includes at least one processor and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor can execute the method as described in claim 1 by invoking the program instructions.

3. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause the computer to perform the method as described in claim 1.

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