致密气藏压裂液水锁抑制剂筛选及性能评价

摘要

为缓解压裂过程造成的水锁伤害,需在压裂液中添加水锁抑制剂.以吸液量、表面张力、接触角、岩心渗透率伤害程度及液锁量等为考察指标,对水锁抑制剂进行了筛选.结果表明,药剂SDY具有良好的防水锁性能,添加SDY的破胶液对岩心渗透率伤害程度较低,液锁量也较小.%In order to relieve the damage from water-lock effect in the fracturing process, it is necessary to add inhibitors of water-lock effect into the fracturing fluid. The selection of such inhibitor depends on the amount of solution absorbed by the powder of the rock sample, surface tension, contact angle, the drop in permeability of the rock core and the amount of liquid "locked" in the rock core. Results showed that SDY had an effective inhibitor of the water-lock effect,the fracturing fluid after degelation with SDY influenced little in rock core' s permeability and the amount of such solution locked in rock core was relatively small.