鄂7井上马家沟组气层酸化工作液性能研究

STUDIES ON ACIDIZING FLUID FOR LOW PERMEABILITY AND LOW PRESSUER GAS RESERVOIR OF EXPLORATORY WELL E-7 IN NORTH SHAAXI

针对鄂７井储集层的地质特征，提出了适合该井酸化作业的工作液配方，全面评价了酸液的性能。实验结果表明，该酸液与地层岩石的反应速度慢，腐蚀性小，滤失量低，易于返排，在较高浓度Ｆｅ^（３＋）存在时不沉淀，能满足现场施工的要求。

To stimulate the gas reservoir in well E-7 in North Shaanxi, which is of very low permeability(10￣(-6)- 10￣(-5) μm￣2),low pressure coefficient(0. 929 MPa/100 m) and ralatively high shaliness.a 20%-hydrochloric acidizing fluid of complex composition is worked out and its properties are comprehensively investigated in relation to the functions of every its component: corrosion inhibitor XA-190. ferric stabilizer, antiemulsificator/demulsifier. clay stabilizer TD-15, back flow improver Cheangqing Al, and friction reducer XA-198. Low friction, enhanced retardation of acid-rock reaction(owing, in particular,to the introduction of the friction reducer), low filtrate loss. and themal stability at 90℃ are some of the significant features of this acidizing fluid.