Active fracturing reagent for softening coal rock

Abstract

The invention discloses an active fracturing reagent for softening coal rock, which is a series of special active fracturing reagents for softening coal rock through mixing a new compound surfactant, and is formed by mixing anionic surfactant (alkylbenzene sulfonate), nonionic surfactant (alkylphenol ethoxylates or fatty alcohol polyoxyethylene ether), adducts (aliphatic alcohol and ethylene oxide condensate) of nonionic surfactant to form a novel compounded surfactant, and then mixing with potassium chloride, sodium sulphate and water in a definite ratio. The reagent provided by the invention can be applied to improving water-supplying efficiency, preventing the top-board coal layer striking, reducing coal layer hardness coefficient to a large extent, strengthening coal layer caving ability, improving resource mining rate, lowering coal dust, and preventing the spontaneous combustion of machine and the coal layer, etc.

Description

technical field [0001] The invention belongs to the technical field of mine engineering, and in particular relates to a coal rock softening active fracturing agent suitable for preventing hard coal rock from breaking and impacting, water injection fracturing softening, enhancing risk-causing performance, and improving resource recovery rate. Background technique [0002] Impact disaster is a kind of mine earthquake induced by mining process, and it is a natural disaster in mine. The energy released by impact disasters ranges from 10-5J for the rupture of tiny rock cracks to 109J for large-scale coal and rock destruction, which is equivalent to -6 to 5 on the Richter scale. At present, my country has become one of the countries with the most serious rock burst disasters in the world. The number of impact disaster mines in my country has doubled from 1985 to 2003, and more than 1,000 mines are threatened by impact disasters. Every year, impact disasters cause great economic ...

AI Technical Summary

Problems solved by technology

However, in the face of coal seams, rock formations and other types of coal rocks with different types of impact disasters, in production practice, different water-based additives are used, mainly to effectively break the coal seam, prevent gas, and reduce coal dust. The performance of base fracturing materials and the adsorption and wetting characteristics of coal matrix, as well as the softening ability of fracturing fluid and the timing and fixed point control of fracturing aqueous solution driving gas interface, etc., have not been studied enough for various reasons. In the face of industrialization, there are still problems. Issues to be studied in depth