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A composite model of hydraulic fractured horizontal well with stimulated reservoir volume in tight oil & gas reservoir

机译：致密油气藏水力压裂水平井与增产油藏的复合模型

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摘要

Due to the low porosity and permeability, multiple hydraulic fracturing is applied in tight oil & gas reservoir. A composite model of multiple fractured horizontal well is built with considering the stimulated reservoir volume (SRV), where the reservoir is divided into three main areas including fractures, stimulated reservoir volume and unstimulated reservoir. The dimension of fracture is reduced based on the discrete fracture model (DFM) to improve the computational efficiency, the stimulated reservoir volume follows the dual permeability model, and the unstimulated reservoir obeys to the single porosity model. The composite model is solved using the finite element method and verified by the classic analytical solution in dual porosity reservoir. The result shows that there are five main flow regimes for the multi-fractured horizontal well (MFHW) in the composite model including linear flow around the hydraulic fractures, pseudo-steady flow of transition area, inter-porosity flow period, radial flow of unstimulated reservoir and the outer boundary pseudo-steady flow. The bigger the size of SRV is, the later the pseudo-steady flow of transition area arrived, so according to the arrival time of pressure wave to the SRV outer boundary, namely the pseudo-steady flow of transition area appeared, the size of SRV can be determined; and the smaller main hydraulic fracture permeability is, the later the time of pseudosteady flow of transition area arrived. (C) 2015 Elsevier B.V. All rights reserved.
机译：由于孔隙率和渗透率低，致密油气储层进行了多次水力压裂。考虑增产油藏量（SRV），建立了多口裂缝水平井的复合模型，将储层分为裂缝，增产油藏和未增产油藏三个主要区域。基于离散裂缝模型（DFM）减小了裂缝尺寸，以提高计算效率，增产油藏遵循双重渗透率模型，未增产油藏遵循单孔隙度模型。采用有限元方法对复合模型进行求解，并通过双孔隙储层的经典解析解进行了验证。结果表明，复合模型中多裂口水平井（MFHW）主要有五种流态，即水力压裂周围的线性流，过渡区的拟稳态流，孔隙间的流期，非增产的径向流。储层和外边界拟稳定流。 SRV的大小越大，过渡区域的拟稳态流动就越晚，因此，根据压力波到达SRV外边界的时间，即过渡区域的拟稳态流动出现，SRV的大小可以确定主水力压裂渗透率越小，过渡区拟稳态流动的时间越晚。 （C）2015 Elsevier B.V.保留所有权利。

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