水平井精细分段深度酸化压裂技术研究与应用

Study and Application of Fine Segmented Deep Acid Fracturing Technology for Horizontal Wells

四川盆地高石梯-磨溪地区震旦系灯影组碳酸盐岩气藏储层具有超深、高温、低孔低渗且非均质性强的地质特征,为储层改造带来新挑战,当前的改造工艺需进一步优化。通过室内实验和理论研究,对储层可压裂改造性进行量化评价,优选酸液体系和酸化压裂工艺,优化注酸排量和注酸强度等参数,形成了水平井精细分段深度酸化压裂工艺,并进行了现场应用。结果表明,该技术在高石梯-磨溪地区灯影组碳酸盐岩气藏应用32口井,取得了良好效果,平均单井测试日产气量为79.8×10^(4)m^(3)/d,其中,测试日产气量达到百万立方米的气井为10口。该技术体系取得了明显的压裂效果,可为低孔低渗碳酸盐岩储层的高效开发提供技术支持。

Carbonate gas reservoirs in Sinian Dengying Formation,Gaoshiti-Moxi Area,Sichuan Basin is geologically characterized by ultra depth,high temperature,low porosity,low permeability,and high heterogeneity,bringing new challenges for reservoir stimulation.The existing stimulation technologies need to be further optimized.With laboratory experiments and theoretical studies,the reservoir fracturability was evaluated quantitatively,the acidizing fluid system and acid fracturing technologies were selected preferably,and parameters,such as acidizing fluid injection,displacement and injection intensity,were optimized.The fine segmented deep acid fracturing technology for horizontal wells was developed and applied in the field.The results showed that the technology achieved good results by application to 32 wells in carbonate gas reservoirs in Dengying Formation,Gaoshiti-Moxi Area,the average daily gas production of single test well was 79.8×10^(4)m^(3)/d,and there were 10 wells reaching a daily gas production of 1 million m^(3)/d.This technical system has achieved obvious fracturing effect and can provide technical support for the efficient development of carbonate reservoirs with low porosity and permeability.