SU1647152A1 - Method and device for preventing gas-dynamic manifestations in driving of development workings - Google Patents

Abstract

The invention relates to the mining industry and m. used when driving development workings. The purpose of the invention is to increase the efficiency of the prevention of gas-dynamic phenomena by deep pre-treatment of the coal mass. Drill wells (C) and determine the amount of minimum advance ahead of the discharge-degassed zone. From C in the soil, excavation and decontamination cavities (RDP) are formed before crossing the layer of weakly degassed rocks to its full thickness, filled with gravel and supplied with degassing pipes connected to the vacuum line, RDP is formed in the direction from the bottom C to the bottom of the working length equal to the difference between the length C and the value of the minimum advance of the discharge-degassed zone. In subsequent cycles, C is arranged in a checkerboard pattern. The method is carried out by a device consisting of a stand of high-pressure pipes and a hydraulic perforator at the end of these pipes with openings for the passage of water and for washing C. Additionally, the hydraulic perforator is equipped with a high-pressure filter and shrizroklespan installed in the washing hole C. 2 C.p.p. ly, 3 il. (Ls

Description

Invented-le relates to the mining industry and can be used in the passage of preparatory workings.

The purpose of the invention is to increase the efficiency of the prevention of gas-dynamic phenomena by deep pre-treatment of the coal mass.

Figures 1 and 2 show diagrams of the implementation of the method for preventing gas-gas-dynamic phenomena when driving development workings, respectively, a section and a top view; FIG. 3 is a device diagram for implementing the method.

The method is carried out as follows.

When preparatory excavation 1 is being drilled through coal bed Stu2 and in the presence of a formation 2 in the soil, a layer 3 hazardous in terms of gas-dynamic phenomena from the stopped preparatory downhole generation 4 is drilling 5 (Figs. 1 and 2). The length of the scale is limited by the capabilities of the drilling equipment; it does not amount to more than the minimum advance value of the processed 6. The minimum minimum advance is 3-5 meters. Next, a device that implements

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method, and perform the discharge-degassing cavity. The cavity is performed by hydro-cutting the mass (formation of a cavity), which is maintained until the distance between the bottom of production 4 and the cavity formed is equal to the minimum advance of the treated zone 6. After that, the hydraulic is stopped, the wellhead is sealed with a plug connect to the vacuum line and capture the gas.

After the discharge-degassing cavity has been formed and the advanced array is degassed for 1-2 days, the excavation of mine 1 is resumed and driven along the treated area until the end of the cavity reaches the minimum advance distance 6, after which the bottom of the development mine is stopped and The next treatment cycle, the well 5 in each subsequent cycle being produced in a staggered order (Fig. 2).

The device comprises becoming high-pressure pipes 7, connected by couplings 8 and having a hydraulic perforator 9 at the end (FIG. 3). As the latter, for example, the AP-6M hydroperforator used in the petroleum industry for cutting steel casing with water can be used. The hydraulic perforator 9 has two holes: a hole 10 and a hole into which a high-pressure die is pressed into with a hole. The device also includes a ball valve 11.

The device works as follows.

When the device is introduced into the well 5, the ball valve 11 is absent, the holes 10 and 12 are open, and the supply of high-pressure pipes 7 to the flushing fluid facilitates the delivery of the hydraulic perforator 9 to the bottom of the well 5. High-pressure nozzles 13 are oriented perpendicularly downwards relative to the soil of the reservoir 2. Further A ball valve 11 is introduced into the stand of high-pressure pipes 7 and the process of hydro-cutting begins to form cavity 14. At the beginning of the process of hydro-cutting, the ball valve 11 is brought to hole 10 under the action of water pressure, In this case, for the exit of the water, one hole 12 is left through which hydro-cutting is performed.

The process of hydro-cutting is a reciprocating movement of the hydraulic perforator 9 from the bottom of the well 5 to its mouth, in which the static

The water pressure (pressure 150–200 atm) is converted into a high-pressure die 13 into a velocity one, due to which the speed of the outflow of the water jet, its range and the impact force sharply increase. When water destroys the rock-coal massif, an unloading-degassing cavity 14 is formed, which is cut into the soil of layer 3 and its height is regulated by changing

pressure (pressure) of water. After hydrocutting the cavity, the wellhead is sealed with a plug 15 and connected to the vacuum line 16.

Formula of invention

1. A method of preventing gas-dynamic phenomena when drilling preparatory workings, including drilling wells, determining the magnitude of the reduced advance of the unloading-degassed zone, forming in the soil the unloading and degassing cavities in the soil until the layer of weakly degassed rocks crosses its entire thickness.

filling them with gravel, setting up in the cavity of the degassing nozzles, sealing the cavities near the soil of the mine, connecting the degassing nozzles to the vacuum line and capturing gas, which is also distinguished by the fact that, in order to increase the effectiveness of the prevention of gas-dynamic effects by deep pre-treatment of the coal array, it is unloading degassing cavities in the first cycle of the excavation form of wells in the direction from the bottom of these wells to the bottom of the generation of length equal to the difference between the length of the well and the minimum the direct-advance degassed unloading zone, while in subsequent cycles wells arranged in staggered.

2. A device for the prevention of gas-dynamic phenomena during the penetration of preparatory workings, including the becoming of high-pressure pipes, a hydroperforator placed at the end of the stand of pipes with an opening for the passage of water during the formation of cavities and an opening for flushing wells, characterized in that, in order to increase the effectiveness of warning gas-dynamic by deep pre-treatment of the coal massif, the hydraulic perforator is equipped with a high-pressure filler, and in the water washing hole n sharikoklapan.

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Claims (2)

Claim 1. A method of preventing gas-dynamic phenomena during the excavation of preparatory workings, including drilling wells, determining the magnitude of the minimum advance of the discharge-degassed zone, the formation of discharge-degassing cavities in the soil until the layer of weakly degassable rocks intersects at its full capacity, filling them with gravel, and introducing them into the degassing cavities nozzles, sealing cavities near the excavation soil, connecting the degassing nozzles to the vacuum line and gas capture, which consists in To increase the efficiency of the prevention of gas-dynamic phenomena through deep advance processing of the coal mass, discharge and degassing cavities in the first extraction cycle are formed from the wells in the direction from the bottom of these wells to the bottom of the working length equal to the difference between the length of the well and the minimum advance of the discharge-degassed zone, in subsequent cycles, the wells are staggered. 2. A device for preventing gas-dynamic phenomena during the excavation of preparatory workings, including becoming a high-pressure pipe, a hydraulic perforator located at the end of the pipe with a hole for water passage during the formation of cavities and a hole for washing wells, characterized in that, in order to increase the prevention of gas-dynamic phenomena by deep advance processing of the coal massif, the hydroperforator is equipped with a high-pressure die, and a hole for washing water is installed arikoklapan.