简介:摘要:压裂施工过程中,水基压裂液压后破胶不彻底,滤液的滞留以及残渣吸附对储层造成不可避免储层伤害。致密储层孔喉细小,残渣粒径远大于孔喉半径无法侵入储层,本文采用破胶液滤液对基质岩心伤害评价和破胶液残渣对支撑裂缝导流能力的影响来评价瓜胶压裂液对致密储层的伤害性能。实验结果表明,破胶液滤液对基质伤害主要表现在破胶液的粘度、压裂液破胶是一个持续过程,瓜胶浓度降低、压裂液注入量的减少,都有助于降低压裂液残渣对支撑裂缝导流能力的伤害。表界面张力,粘度越高、表面张力越大对岩心伤害越大,提高助排剂的性能和实现压裂液彻底破胶有助于降低储层伤害。建议现场实验可以采用低残渣压裂液或者强氧化剂、酸以及螯合剂复配的强效破胶剂来降低残渣对导流能力的伤害。
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