A Gas Drainage Drilling and Sealing Process

Abstract

The invention discloses a gas drainage borehole sealing process. The gas drainage borehole sealing process comprises the following steps that 1, boring slag is ground to be made into pulp, specifically, the boring slag discharged after construction drilling is collected and smashed into mixtures of granules and powder, water is added into the mixtures of the granules and the powder, and the primary pulp is obtained by uniformly stirring the water and the mixtures; 2, pulp additives are prepared, specifically, acrylate adhesives are used as a matrix, silane coupling agents and admixtures of ethyl alcohol and acetic are added into the matrix and mixed uniformly, and then the pulp additives are obtained; 3, filling pulp is prepared, specifically, the pulp additives are added into the primary pulp, mixed and uniformly stirred, and the filling pulp is obtained; and 4, the filling pulp is poured, specifically, the filling pulp is poured into boreholes, and after the filling pulp is solidified, borehole sealing is completed. According to the gas drainage borehole sealing process, the waste boring slag discharged after construction drilling is recycled, the borehole sealing cost is reduced greatly, in addition, the whole borehole sealing process is easy and convenient to operate, and the labor intensity of workers is relieved.

Description

technical field [0001] The invention relates to the technical field of coal seam drilling and sealing, in particular to a gas drainage drilling and sealing process. Background technique [0002] Coalbed methane is a kind of unconventional natural gas that is born in coal seams and is mainly stored in coal seams in an adsorbed state. It is commonly known as gas, and its main component is methane. The fundamental way to control coal seam gas is drainage. The quality of drainage borehole sealing determines the quality of gas drainage. High-sealed gas drainage boreholes can extract high-concentration gas, shorten the time of gas drainage, and save energy consumption. , improve enterprise efficiency. The existing sealing methods mainly include cement slurry sealing, yellow mud sealing, polyurethane sealing and traditional hole sealing. Among them, the operation of cement slurry sealing and yellow mud sealing is very simple, but the two sealing There are three outstanding proble...

AI Technical Summary

Problems solved by technology

The existing sealing methods mainly include cement slurry sealing, yellow mud sealing, polyurethane sealing and traditional hole sealing. Among them, the operation of cement slurry sealing and yellow mud sealing is very simple, but the two sealing There are three outstanding problems in the hole method: first, the scope of application is small, mainly for upward drilling, and the effect on downward or horizontal drilling is poor; The compressive strength is low, and the sealing effect is difficult to be guaranteed; the third is that the transportation of cement slurry and yellow mud raw materials requires a lot of manpower and material resources, especially in the construction environment of coal seam underground, the construction space is very limited, further increasing the transportation cost

During the polyurethane sealing process, due to the fast reaction speed and short sealing depth, it is difficult to avoid the broken zone and crack development zone formed near the drilling hole, and the solidified body formed by the polyurethane reaction has low strength, so it is difficult to clean the exposed drilled hole. The hole wall forms a certain supporting effect, and cracks or deformation appear in the hole wall during the extraction process, resulting in a sharp drop in the sealing effect, which directly affects the gas extraction rate

The traditional pocket sealer has poor adaptability to the size of the hole and the shape of the hole, and the quality of the hole sealing cannot be guaranteed.

[0003] Moreover, in the above-mentioned existing main hole sealing methods, it is necessary to invest a large amount of manpower and material resources to transport the hole sealing materials before the hole sealing operation. At the same time, the drilling slag brought by the drilling construction takes up a large construction space. Under the environment where the construction space of the underground coal seam is very limited, the drilling slag must be cleaned before the sealing construction, and the cleaning of the drilling slag requires a lot of manpower and material resources for loading, unloading and transportation, which is very cumbersome and costly. The slag can only be piled up as waste and cannot be utilized