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基于储层改造体积开发的致密油藏压力传播研究

Study on Pressure Propagation in Tight Oil Reservoirs with Stimulated Reservoir Volume Development.

作者信息

Zhu Weiyao, Liu Yunfeng, Li Zhongxing, Yue Ming, Kong Debin

机构信息

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.

Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, People's Republic of China.

出版信息

ACS Omega. 2021 Jan 19;6(4):2589-2600. doi: 10.1021/acsomega.0c04661. eCollection 2021 Feb 2.

DOI:10.1021/acsomega.0c04661
PMID:33553877
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7859946/
Abstract

The stimulated reservoir volume fracturing development in tight oil reservoirs is characterized by multiscale flow of the reservoir matrix, fracture network, and hydraulic fracture. Therefore, the flow field structure is extremely complex. Multiscale flow characteristics have been revealed through the systematical experiments including the threshold pressure gradient and the stress sensitivity. Based on the theory of elliptical flow, a comprehensive and practical mathematical model of multiregion coupling flow is established to characterize the multiscale flow, and the pressure distribution equation is derived. The calculation method of moving boundary is established to simulate the dynamic supply boundary and the dynamic pressure distribution by using the steady-state sequential replacement method. The characteristics of multiscale flow, multistage development state, and stress sensitivity are considered, especially the different stress sensitivity characteristics in different regions. Finally, the pressure propagation in tight reservoirs is clarified and the influence of matrix permeability, stress sensitivity characteristics, and drawdown pressure on the distance at the dynamic supply boundary are revealed. The research results provide theoretical basis for the development effect evaluation.

摘要

致密油藏体积压裂开发中，储层基质、裂缝网络和水力裂缝存在多尺度流动，流场结构极为复杂。通过包括启动压力梯度和应力敏感性在内的系统实验揭示了多尺度流动特征。基于椭圆流理论，建立了综合实用的多区域耦合流动数学模型来表征多尺度流动，并推导了压力分布方程。建立了移动边界计算方法，采用稳态顺序替换法模拟动态供给边界和动态压力分布。考虑了多尺度流动、多阶段开发状态和应力敏感性特征，特别是不同区域的不同应力敏感性特征。最终阐明了致密油藏中的压力传播规律，揭示了基质渗透率、应力敏感性特征和生产压差对动态供给边界处距离的影响。研究结果为开发效果评价提供了理论依据。

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