注入水对碳酸盐岩储层伤害机理研究

Study on Damage Mechanism of Injection Water to Carbonate Reservoirs

为了揭示注入水对储层的伤害情况,针对中东地区哈法亚油田碳酸盐岩注入水问题,通过对中东地区哈法亚油田MB1层岩心的一系列宏观实验,对碳酸盐岩储层伤害机理进行分析。最终确定外来液体固相侵入是伤害储层的主要原因,然后根据岩心在注入水前和注入水后扫描电镜的图片对比,展开微观分析,对储层进行伤害评价。结果表明,哈法亚油田储层的敏感性偏弱,水锁和应力敏感性对储层的伤害很小,外来液体的固相侵入会造成孔喉堵塞,导致渗透率下降伤害储层。

In order to reveal the damage caused by injected water to the reservoir,a series of macroscopic experiments on the core of the MB1 layer in Hafaya oilfield in the Middle East were carried out in response to the problem of water injection.The damage mechanism of carbonate reservoirs was analyzed.It was finally determined that the external solid phase intrusion was the main reason for the damage to the reservoir.Then,according to the comparison of the pictures of the core before and after the water injection,the microscopic analysis was carried out to evaluate the damage of the reservoir.The results showed that the sensitivity of the reservoir in Hafaya oilfield was weak,and the water lock and stress sensitivity had little damage to the reservoir.The solid phase intrusion from foreign liquid caused the pore throat blockage,resulting in a decrease in permeability and damage to the reservoir.