杏北油田三次加密试验区入井液性能评价

从杏北油田三次加密调整试验区的生产实际出发，利用室内岩心驱替实验，评价了注入水、压井液、洗井液和粘土防膨剂与储层的适应性。评价结果表明，三次加密试验区的注入水和压井液基本能够与储层相适应，可以满足目前的生产要求，但仍需改善注入水的水质和压井液的性能；洗井液性能较好，可有效地清除近井地带储层污染，适合于该区块近井地带地层清洗、粘土防膨剂对储层没有伤害，可以在杏北油田三次加密试验区使用。

Evaluation on the performances of oil well working fluid in the infill testing area of Xingbei oilfield

Basing on the real conditions in the tertiary infill well testing area of Xingbei oilfield, and using the core flooding test in the laboratory, the compatibilities of injecting water, killing water, flushing water and clay swelling inhibitor with formation were evaluated. Results showed that the injecting water and killing fluid were compatible with formation and could generally meet the requirements of field operations, while there was still room for improvement to the injecting water quality and killing fluid performances; the flushing fluid displayed better performances, and it could effectively remove the formation damage and suitable for used in formation flushing near the borehole; the clay swelling inhibitor had little damage to the formation and can be used for this testing area.