ANALYSIS OF THE ACID STIMULATION EFFECT FOR EXTRA-LOW PERMEABILITY,POROUS FRACTURED RESERVOIR

Gongshan Field locates in Middle North of Sichuan Basin,it belongs to extra-low permeability,porous fractured reservoir,oil and gas enriched zone is controlled by high energy facies limestone and fracture.The fracture is essential to get productivity.For the field adopts expendable production and annual natural decline rate is high up to 16%,acid stimulation is very important measure to make production stability.The paper analyzed the effect of acid stimulation and studied the factors that affected the acid stimulation effect.The research result has very important guidance significance for the reservoir renovation and sustained production in the future.