EXPERIMENTAL STUDY ON HIGH ENERGY GAS FRACTURING TECHNIQUE OF DEEP WELL

High energy gas fracturing is a new and developing well stimulation technique. It involves many scientific spheres such as mechanics, gunpowder detonation and petroleum engineering etc.,has a theory and applicabillty. From the respect of applying study,this paper expounds the laboratatortal tests and field tests of medium deep well and ultra deep well. The test results show that high energy gas fracturing may produce between 3 and 5 radiai fractures,which has obvious well increasing production effect, in different confined pressure and loading rate. The three-axis test results indicate that the pressure produced by high energy gas fracturing is higher than that by hydraulic fracturing,even exceeds elastic limit of rock, which maybe produce permanent deformation and some remnant fractures after unloading,the remnant fractures do not close even though no prop agent. The feasibility and success ratio of this technology are verified in field tests,results show that it has high success ratio and different degree increasing production effect.