滨南油田低渗欠注井酸化增注技术研究与应用

APPLICATION OF ACIDIZING AND AUGMENTED INJECTION TECHNOLOGY TO INJECTION WELLS IN LOW-PERMEABILITY RESERVOIR OF BINNAN OIL FIELD

提出了一种针对滨南低渗油田欠注井酸化增注的系统实验研究方法。根据储层特征分析了注污水和重复酸化对地层的损害及对酸化液的选取原则。根据长岩心酸化流动模拟实验进行了酸化工艺参数优选及其评估分析。现场施工证明该酸化液体系适应性较好 ,工艺参数合理 ,能够较好地解除地层中有机物和无机物堵塞 ,提高注水量 ,降低泵注压力 ,在低渗油田注水井中具有推广价值。

A systematical experimental method of acid treatment for increasing injection of injection wells and well stimulation in the low permeability reservoir of Binnan oil field was proposed. The reservoir performance before acid treatment, the formation damage resulted from injection of polluted water and acidization for many times, as well as the selection principles for different types of acids were discussed. The simulation experiments on the long core flow were carried out. The acidizing parameters on the spot were optimized and evaluated. The practice demonstrated that the acid system obtained from the laboratory test and the parameters adopted on the oil field are suitable for removing plugging and increase the injection of water in the low permeability wells. This method can be generalized in the water injection wells with low\|permeability.