Countermeasure Study For The Interference Of Argillaceous Cave-sedimental Fillings In Reservoir With The Stimulation Result

Mud aciding is the most common stimulation method for sandstone reservoir,but the clay mineral of Da Bei and Ke Shen in Tarium reservoir is high.Sensitive minerals of Bentonite?Illite and chlorite can severely affect the stimulation result.Focusing on this phenomena,this paper conducted a series of experiments for well 208 of Ke Shen.By conducting core damage experiments?analyzing the flowing back fluid?conducting experiments of clay dissolving ?clay anti-swelling?CST testing and velocity sensitive and core flooding experiments,the damage degree of cores and the main damage ion was screened out.The damage mechanism of clay minerals in reservoir stimulation were clarified Getting the type and optimal concentration of the clay stabilizer and chelating GLDA aims at bentonite and illite and illite and chlorite,respectively.Research results are as follows: Getting the optimal clay stabilizer is 3% KCl that aims at expansion of bentonite;Getting the optimal liquid ratio is 20wt%GLDA+1.2wt%HF that aims the fine migration of illite and chlorite By analyzing the content of calcite in cores,the injection sequence of fluid is determined.Based on this experiments,The optimal liquid is very effective for reservoirs with high clay content in Tarium reservoir.