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低渗油田在开发过程中储层容易产生各类污染伤害,导致储层渗流能力下降,从而影响开发效果。对已产生伤害的储层,需要进行有效的解堵来提高储层渗流能力。经过岩心分析,研究区延长组储层内粘土矿物含量较高,在酸化作业时,由于注酸体系及规模控制不当,容易造成二次污染,使得酸化作业失败。通过室内实验研究分析延长组储层岩心与常用低渗储层酸液体系酸蚀作用效果,从而判断出不同酸液作用于岩心的最佳酸液反应浓度,以及酸岩反应速率。通过实验研究,优选出最佳的酸化液体系及酸化工艺流程,并给出了酸液用量的计算方法。研究成果可有效的指导现场酸化工艺的实施,也为同类低渗油田酸化工艺酸液体系优选提供参考。
In the development of low-permeability oilfield, reservoirs are prone to various types of pollution damage, leading to the decline of reservoir seepage ability, thus affecting the development effect. Damage to the reservoir has been generated, the need for effective plugging to improve reservoir seepage capacity. After core analysis, the content of clay minerals in the Yanchang Formation reservoir in the study area is relatively high. During the acidification operation, due to improper control of the acid injection system and scale, secondary pollution is easily caused and the acidification operation fails. The effect of acid etching on the acid system of Yanchang Formation reservoir and the commonly used low permeability reservoir was analyzed through laboratory experiments to determine the optimum acid solution concentration and acid rock reaction rate of different acid solution acting on the core. Through experimental research, the optimum acidification liquid system and acidification process are optimized, and the calculation method of acid dosage is given. The research results can effectively guide the implementation of on-site acidification process, but also provide a reference for the optimization of the acid-liquid system of acidification process for similar low-permeability oilfields.