Laboratory experiment and concentration optimization of autogenetic energy fracturing fluid

An autogenetic Energy fracturing fluid is developed to overcome the difficulties of incomplete gel breaking, lower capability of flow back, and serious formation damage when the hydroxypropyl guar gum gelling fracturing fluid was used in low temperature, low pressure and low permeability reservoirs. The influence of heat generation agents and catalysts contents on reaction rates and heat-generation peaks of autogenetic energy fracturing fluid was analyzed and evaluated systemically. The optimized contents of heat-generation agent and catalysts are respectively 2.0 mol/L and 0.4% when used for fracturing treatment in low temperature formation. Reaction heat peaks under different conditions and the time reached the peaks were further investigated. And then, the viscosity of gel breaking fluid was measured, which was smaller than 5 MPa·s. at the same time, the volume of nitrogen and its influence on density of gel breaking fluid and cleanup effect were analyzed. These results provide important testing data and technical support for application of autogenetic energy fracturing fluid in low temperature and low pressure formations.