from mechanics which will affect rock properties, and explains how the mechanism of acid-pretreatment was used to decrease fracture pressure from micro-structure. Also the paper explains how acid-pretreatment can reduce fracturing pressure on the basis of the results of cast thin slice after acid pretreatment, microscopic observation of microcosmic experiments, and macroscopic mechanical test before and after acid pretreatment. The results of rock mechanical test and fracture pressure before and after pre-acid in DINA district show that acid-pretreatment can change mechanical property of rocks and can decrease fracture pressure effectively. The conclusions can provides a new technical solution for exploitation of this kind reservoirs

low permeability, acid-pretreatment, rock mechanical property, micromechanism, decrease fracture pressure

CLC Number: 

• TE357.2