页岩气藏体积压裂水平井产能有限元数值模拟

发布时间：2018-04-26 12:06

本文选题：页岩气 + 体积压裂　；参考：《断块油气田》2017年04期

【摘要】：考虑到压裂过程中的多重复合作用,将压后页岩储层分为支撑主裂缝、缝网波及区与未压裂区。考虑基岩纳米孔隙中气体吸附与解吸、Knudsen扩散、滑脱流、黏性流,以及水压诱导裂缝应力敏感效应,建立了页岩气藏体积压裂生产动态模拟的物理模型和渗流数学模型。结合Galerkin有限元方法,对基质和裂缝渗流方程进行空间上的离散,推导了三角形单元有限元数值模型,给出了压裂水平井二维渗流场内、外边界条件和水力裂缝处理方法,对时间域采用向后差分,最后顺序求解裂缝和基质压力方程,模拟了页岩气藏体积压裂水平井生产动态和压力场分布。该研究为页岩气储层体积压裂产能评价提供了理论模型,对于有限元法模拟双重介质渗流场和产能预测具有现实意义。
[Abstract]:Considering the multiple complex effect in fracturing process, the shale reservoir after compression is divided into supporting main fracture, fracture network sweep area and unfractured area. Considering the effect of gas adsorption and desorption Knudsen diffusion, slippage flow, viscous flow and hydraulic pressure induced fracture stress sensitivity, a physical model and a seepage mathematical model for simulation of volume fracturing production in shale gas reservoir are established. Combined with Galerkin finite element method, the matrix and fracture seepage equations are discretized in space, the triangular element finite element finite element numerical model is derived, and the internal and external boundary conditions and hydraulic fracture treatment methods are given. In the time domain, backward difference is adopted, and the fracture and matrix pressure equations are solved sequentially to simulate the production performance and pressure field distribution of the volume fracturing horizontal well in shale gas reservoir. This study provides a theoretical model for the evaluation of volume fracturing productivity of shale gas reservoir and is of practical significance for the finite element method to simulate the seepage field and productivity prediction of dual media.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;中国石油塔里木油田分公司塔中油气开发部;
【基金】：国家自然科学基金青年科学基金项目“基于多尺度页岩复杂流动行为的动态评价模型研究”(51404204) 国家科技重大专项“涪陵页岩气开发示范工程”(2016ZX05060) 中国石油化工股份有限公司项目“裂缝动态扩展影响因素研究”(31400026-16-ZC0607-0013)
【分类号】：TE377

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