江陵凹陷薄互层压裂技术研究与应用

Research and Application of Thin Interbed Fracturing Technology in Jiangling Sag

江陵凹陷薄互层为低渗透储层，是勘探的主力区块。平面上断层分布复杂，纵向上砂泥交互隔层差．储层纵向上应力差异小，导致压裂缝高易失控、加砂困难。特殊储层特征影响压裂施工规模与裂缝匹配性，通过对薄互层裂缝延伸方向及压裂缝高扩展影响因素分析，结合压裂缝高扩展规律形态．开展缝高预测及综合控制技术研究．认为影响缝高的主要因素为缝内净压力，采用组合压裂液、组合排量。支撑剂段塞配套工艺，以及增效压裂液和防盐敏压裂液两种低伤害压裂液体系等压裂改造技术，可增强压裂效果。江陵凹陷薄互层7井次的压裂实践验证了这一认识，为预计控制储量1150×10^4 t的有效动用提供技术支撑。

The thin interbed in Jiangling ,Sag is a low--permeability reservoir as the main exploration block. The fault distribution is complicated horizontally while sand--clay inlerlayer interaction is poor vertically, and the reservoir has a small stress difference vertically, making fractured crack height easy to be out of control and ,sand adding difficult. on the basis of the research on crack height prediction and comprehensive control technology, the author believes that the main factor that influences crack height is the net pressure within the crack, and that fracturing result can be improved by means of fracturing technologies such as combined fracturing fluid and displacement and propagent slug matching technology and two kinds of low--damage fracturing fluid systems, that is, synergistic fracturing fluid and anti-salt one.