Abstract
Air is a source of gas that is widely and easily obtained. Air fracturing is an ideal technology for reservoir stimulation in the future, and is also the best way to solve the pollution problem of oil and natural gas exploitation. The technology of air foam flooding and air drilling has achieved good results in oil fields at home and abroad. The feasibility of air foam fracturing technology is explored through studying the safety conditions for deflagration of air medium in gas reservoirs and the requirements of air foam fracturing technology. The results of preliminary laboratory study: at 100°C and 1MPa, the mixture of methane and air is safe when oxygen concentration is not higher than 11% in air, while the safety boundary is 5% for oxygen reduction requirement in air foam flooding. The viscoelastic properties of the developed air foam fracturing fluid can meet the requirements of conventional fracturing construction.
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