压裂液体系对储层伤害试验研究

针对目前压裂液体系长期滞留对储层伤害的问题，通过模拟各压裂段施工条件，然后就不同压裂体系对储层的伤害进行试验与评价。实验结果表明，压裂体系滞留对低渗透层均存在不同程度的伤害。随着压裂体系滞留时间的增加，对储层的伤害程度也增加，但伤害率的增加幅度却不断减小。其中，PPQ压裂体系对储层伤害最大，对3个研究区的平均伤害率分别为64.00%、81.95%、66.50%；残渣的存在导致PPQ和胍胶对低渗透率储层伤害较大，清洁压裂液对储层的伤害则较小。

Experimental study on damage of fracturing fluid system to reservoir

In view of the current long-term retention of fracturing fluid system damage to the reservoir，the construction conditions of each fracturing section are simulated by simulation，and then the damage of different fracturing systems to the reservoir was tested and evaluated.The experimental results showed that the retention of the fracturing system has different degrees of damage to the low permeability layers.As the residence time of the fracturing system increases，the damage to the reservoir also increases，but the increase in the damage rate continues to decrease.Among them，the PPQ fracturing system is the most harmful to the reservoir.The average damage rate to the three study areas is 64.00%，81.95%，and 66.50% respectively.The presence of residues causes PPQ and guar gum to cause greater damage to low permeability reservoirs.Clean fracturing fluid does less damage to the reservoir.