Coal reservoir permeability increasing agent based on aqueous solution of sodium hypochlorite

Abstract

The invention belongs to the technical field of coal mine safety production. In order to solve the problems of difficulty in field large-scale popularization and application, ultralow oxidation rate on coal at the normal temperature of an existing permeability increasing agent, the invention provides a coal reservoir permeability increasing agent based on aqueous solution of sodium hypochlorite. The coal reservoir permeability increasing agent consists of a component A, a component B and water; the component A is sodium hypochlorite solid or sodium hypochlorite solution; the component B is a pH regulator and is hydrochloric acid or sulfuric acid of which concentration is smaller than 10%; concentration of effective chloridion in the coal reservoir permeability increasing agent based on the aqueous solution of sodium hypochlorite is 1% to 6%; a pH value of the coal reservoir permeability increasing agent based on the aqueous solution of sodium hypochlorite is 9 to 13. Gas permeability of a coal seam is improved, and an actual working surface is subjected to pre-drainage rapidly and regionally. When the coal reservoir permeability increasing agent is adopted to carry out permeability increasing on coal, gas drainage time is greatly shortened; a drilling work amount is reduced; high-gas low-gas-permeability coal seam permeability increasing and efficient gas drainage are implemented, regional gas pre-drainage efficiency of a coalface and a coal road strip is improved, drainage time is shortened, a drainage radius is enlarged, the drilling work amount is reduced, and gas disasters are eliminated to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a coal reservoir anti-permeability agent based on a sodium hypochlorite aqueous solution. Background technique [0002] On October 16, 2011, the State Administration of Work Safety, the National Development and Reform Commission, the National Energy Administration, and the State Coal Mine Safety Supervision Bureau issued the "Provisional Provisions on Coal Mine Gas Drainage Standards" with Ann Jian Zongmei [2011] No. 163 Mine with one of the following situations must conduct gas drainage and achieve drainage standards: (1) Mining dangerous coal seams with coal and gas outbursts; (2) The absolute gas emission of a coal mining face is greater than 5m / min or The absolute gas emission of a tunneling face is greater than 3m / min; (3) the absolute gas emission of a mine is greater than or equal to 40m / min; (4) the absolute gas emission of the mine is 1.0-...

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Problems solved by technology

[0008] Downhole hydraulic fracturing: The principle of downhole hydraulic fracturing is the same as that of surface hydraulic fracturing, but limited by the space in the well, only small-scale equipment can be used for fracturing, and the power is small, so it is difficult to add sand into the water as a proppant and send it into the coal seam in the opened crack

It also relies on physical effects to increase permeability, and is mainly used in coal reservoirs with hard coal and good air permeability. The project cost is not high, but the effect is usually not as significant as ground fracturing

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