A low-temperature freshwater-based fracturing diversion fluid for coalbed methane and its application

Abstract

The invention relates to a low-temperature fresh-water-based fracturing diverting liquid used for coalbed gas and applications thereof. The content of a fluff agent is 0.2-0.5 g per 100 g of water. The content of a nucleating agent is 0.05-0.1 g per 100 g of water. The content of a film forming agent is 0.1-0.3 g per 100 g of water. The content of a ball layer agent is 1.5-1.7 g per 100 g of water. The content of a nucleating agent is 0.03-0.05 g per 100 g of water. The content of an inhibitor is 0.1-0.15 g per 100 g of water. The content of potassium chloride is 2-3 g per 100 g of water. The content of PAC is 0.3 g per 100 g of water. According to the fracturing diverting liquid, the density is 0.85-1.00 g / cm<3>, the pH value is 7-9, plastic viscosity is 45-60 mPa*s, the static seepage loss amount is not more than 10 mL / 30 min, the dynamic seepage loss amount is not more than 10 mL / 30 min, and the core return permeability is not less than 85%. The fracturing diverting liquid is suitable for well completion of coalbed gas stratums in the Qinshui area.

Description

technical field [0001] The invention relates to a fracturing diverting fluid, in particular to a low-temperature fresh water-based fracturing diverting fluid suitable for coalbed methane in the Qinshui area and its application. Background technique [0002] Fracturing diversion fluid is one of the necessary materials used to increase formation porosity and production during well completion. Investigated more than 20 documents, compared the special fracturing technology at home and abroad and the current situation of the existing diversion fracturing technology. At present, the diversion fracturing fluid in China is mainly composed of solid particles. In 2000, Yan Jingen and others developed a water-soluble temporary plugging agent YJDII, the main components of which are inorganic salts and organic acids. In 2000, Hu Yongquan et al. proposed the refracturing technology of plugging old fractures and pressing new ones. For this reason, they developed an old fracture plugging a...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a coal seam suitable for the Qinshui area in view of the deficiencies of the existing fracturing steering temporary plugging materials that are difficult to match with the leakage channel and the gas-type fluid on-site producing equipment in the existing coalbed methane layer well completion process. Low-temperature freshwater-based fracturing diversion fluid for gas and its preparation and application, to solve the problems of leakage and uncontrollable diversion in the process of coalbed methane well completion

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