李准,吴晓东,任允鹏,李超,韩国庆,史殊哲
LI Zhun,WU Xiaodong,REN Yunpeng,LI Chao,HAN Guoqing,SHI Shuzhe

• 1:中国石油大学(北京)石油工程教育部重点实验室
• 2:中国石油化工股份有限公司胜利油田分公司勘探开发研究院

摘要(Abstract)：

致密油藏储层物性差,存在较强的应力敏感性,采用体积压裂的方式进行改造后,改造区和未改造区的储层物性往往存在较大差异。为分析致密储层体积压裂直井的瞬态压力响应特征,通过将直井体积压裂改造后的储层简化为双区径向复合模型,利用摄动变换、拉氏变换、牛顿—辛普森迭代、数值反演等方法,建立了体积压裂直井的瞬态压力计算模型。并通过与商业数值模拟软件对比,验证了该模型的正确性。模型计算结果表明:体积压裂直井主要有6个典型的流动阶段,外区的应力敏感主要影响外区径向流阶段,而内区应力敏感则对内外区各个流动阶段都有较大的影响。新模型可为体积压裂直井的压裂效果评价和试井解释提供理论基础。
Tight oil reservoirs are characterized by rather poorer physical properties and stronger stress sensitivity, with the help of the stimulated reservoir volume(SRV), there exists rather bigger difference in the physical properties in both the stimulated and unstimulated blocks. In order to analyze the transient pressure response characteristics of the volume-fractured vertical wells in the tight reservoir, the reservoirs after the stimulation are simplified as two-block radial composite model, with the help of perturbation and Laplace transforms, Newton-Simpson iteration, numerical inversion and so on, the calculating model of the transient pressure was established for the volume-fractured vertical wells. Comparing with the commercial numerical simulating software, the correctness of the model was verified. The model calculation results show that there are mainly six typical flow stages for the volume-fractured vertical wells, the outer-block radial flow stages are mainly affected by the outer-block stress sensitivity, while each stage no matter in the inner block or the out block is seriously influenced by the inner stress sensitivity. The new model can provide the certain theoretical bases for the evaluation of the fractured effects and well test interpretation of the volume-fractured vertical wells.

关键词(KeyWords)： 致密储层;应力敏感;体积压裂直井;复合模型;瞬态压力
tight reservoir;stress sensitivity;volume-fractured vertical well;composite model;transient pressure

Abstract:

Keywords:

基金项目(Foundation): 国家油气重大专项“渤海湾盆地济阳坳陷致密油开发示范工程”(2017ZX05072006-002);; 国家科技重大专项子课题“复杂结构井、丛式井设计与控制新技术”(2017ZX05009-003)

作者(Author): 李准,吴晓东,任允鹏,李超,韩国庆,史殊哲
LI Zhun,WU Xiaodong,REN Yunpeng,LI Chao,HAN Guoqing,SHI Shuzhe

DOI: 10.19597/j.issn.1000-3754.201809022

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