The Development and Application of Inverse Emulsified Friction Reducer and Slickwater System

Due to low friction reduction and high formation damage caused by conventional fracturing fluids as well as the high cost of imported slickwater systems, a low-cost, low-damage inverse emulsified friction reducer and slickwater system were developed which would significantly reduce resistance and treatment pressure in field operations and greatly improve stimulation effect.The inverse emulsified friction reducer was synthesized by inverse emulsion polymerization method, which was used as main agent in new a slickwater system comprised of optimal clay stabilizer and a cleanup agent with good compatibility and synergy.Lab experiments showed that the resistance reduction rate of inverse emulsified friction reducer solution with concentration of 0.10%—0.15% reached 65% or higher and the resistance reduction rate of the new slickwater system reached 65%.In addition, the new slickwater system displayed superior anti-swelling, cleanup, temperature-resistance, and brine tolerance characteristics.The new slickwater system has been applied in staged fracturing in thin tight reservoirs and shale oil and gas reservoirs in Qinghai, Jianghan, Huabei and so on, displaying good characteristics and application results, which indicate that the new slickwater system could meet the requirements for fracturing shale and tight gas and oil reservoirs.