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Coal measure strata tight sandstone gas reservoirs fracturing technology research and application
Author(s): 
Pages: 64-67,80
Year: Issue:  3
Journal: Petrochemical Industry Application

Keyword:  煤系地层致密砂岩气天然裂缝压裂;
Abstract: 山西NG区块煤系地层在本溪、山西、石盒子组不同程度地发育有致密砂岩储层,具有低压致密、含气性差、储层温度低、天然裂缝发育等特点,由于对储层认识不够深入,前期改造过程中存在压裂设计参数与储层条件不匹配、压裂液储层伤害大、现场施工成功率低等问题.为此,针对研究区储层特征研究配套了机械工具分层提高纵向上动用程度、高前置液比例及大排量施工形成复杂裂缝压裂扩大泄流面积的压裂工艺,配套稠化剂浓度为0.25%~0.28%的低浓度低伤害胍胶压裂液体系,压裂液残渣含量较前期降低50%.现场试验7井18层,施工成功率100%,压后单位厚度气层产气量较前期提高47%,为研究区煤系地层致密气藏改造提供了一条有效途径.
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