李准;吴晓东;韩国庆;马高强;张路锋;王彪;

• 1:中国石油大学(北京)石油工程教育部重点实验室

• 2:中国石油大学(北京)非常规天然气研究院

摘要(Abstract)：

致密储层普遍存在应力敏感效应,体积压裂改造区(SRV)和未改造区的储层物性差异较大,复杂地应力导致有效支撑裂缝(主缝)和井筒并不完全垂直。利用摄动变换和拉普拉斯变换,推导考虑改造区影响和储层应力敏感效应的线源函数;采用叠加原理,建立考虑裂缝和井筒呈任意角的体积压裂水平压力计算模型;通过模型退化结果和现有模型计算结果比较,验证计算模型的正确性。结果表明:体积压裂水平井的渗流过程可以分为9个阶段。应力敏感效应对生产后期的影响较大,应力敏感因数越大,压力导数曲线上翘幅度越大;内外区流度比越大,内区半径越小,内区拟径向流持续的时间越短;当裂缝和井筒夹角较小时,随夹角降低,缝间干扰越强,无因次压力越大;压裂水平井裂缝参数(缝间距、缝长、裂缝条数)主要影响改造区的渗流规律。该结果对致密油藏体积压裂水平井渗流规律分析和试井解释有一定的借鉴意义。

关键词(KeyWords)：致密油;应力敏感;体积压裂水平井;倾斜裂缝;瞬态压力

Abstract:

Keywords:

基金项目(Foundation):国家科技重大专项(2017ZX05072-006-002,2017ZX05009-003)

作者(Author):李准;吴晓东;韩国庆;马高强;张路锋;王彪;

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