针对致密储层体积压裂缝网扩展预测和多重孔隙介质耦合流动模拟难度大的问题,开展了基于体积压裂裂缝扩展机理的致密储层流体流动规律研究,建立了多重介质不稳定渗流数学模型和多裂缝互相干扰条件下的压裂裂缝网络扩展模型,并采用有限单元法求解。以鄂尔多斯盆地致密油为例进行生产模拟,分析致密油藏体积压裂水平井不同孔隙介质产量贡献程度。研究表明:体积压裂水平井簇间距减小,则水力裂缝延伸长度变短,平均带长减小,改造面积先减小后趋于平缓,平均带宽和裂缝宽度先增大后趋于平缓;体积压裂水平井产能贡献以天然裂缝和水力裂缝为主,基质对产能贡献较小。研究结果为致密储层压裂水平井裂缝扩展模拟和产能预测提供了一定的理论基础。
On account of difficulties in prediction of fracture network propagation caused by stimulated reservoir volume (SRV) fracturing and in simulation of coupled flow in multi-pore media in tight reservoirs, a study was conducted on fluid flow rules in tight reservoirs based on fracture propagation mechanism with SRV fracturing, a mathematical model for transient seepage flow in multiple media and a propagation model for fracture network produced by fracturing under mutual interference of multiple fractures were established, and finite element method was used for solving. A production simulation was performed based on a case study of tight oil in the Ordos Basin to analyze the contribution of different pore media to the productivity of SRV-fractured horizontal wells in tight oil reservoirs. The findings show that if the spacing of SRV-fractured horizontal well clusters is shortened, the hydraulic fracture propagation length is shorter, the average belt length is decreased, the stimulated area first is decreased and then tends to be stable, and the average belt width and fracture width first are increased and then tend to be stable; the construction to productivity of SRV-fractured horizontal well is dominated by natural and and hydraulic fractures, and the matrix has little contribution to productivity. The results of the study provide a theoretical foundation for fracture propagation simulation and productivity prediction of fractured horizontal wells in tight reservoirs.
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