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Production rate analysis of multiple-fractured horizontal wells in shale gas reservoirs by a trilinear flow model

机译:利用三线性流模型分析页岩气藏多口水平井产能

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摘要

Most multiple-fractured horizontal wells experience long-term linear flow due to the ultralow permeability of shale gas reservoirs. Considering the existence of natural fractures caused by compression and shear stresses during the process of tectonic movement or the expansion of high-pressure gas, a shale gas reservoir can be more appropriately described by dual-porosity medium. Based on the assumption of slab dual-porosity, this paper uses the trilinear flow model to simulate the transient production behavior of multiple-fractured horizontal wells in shale gas reservoirs, which takes the desorption of adsorbed gas, Knudsen diffusion and gas slippage flow in the shale matrix into consideration. Production decline curves are plotted with the Stehfest numerical inversion algorithm, and sensitivity analysis is done to identify the most influential reservoir and hydraulic fracture parameters. It was found that the density and permeability of the natural fracture network are the most important parameters affecting the production dynamics of multiple-fractured horizontal wells in shale gas reservoirs. The higher the density and permeability of the natural fractures are, the shorter the time is required to exploit the same amount of reserve, which means a faster investment payoff period. The analytical model presented in this paper can provide some insight into the reserve evaluation and production prediction for shale gas reservoirs.
机译:由于页岩气储层的超低渗透性,大多数多裂口水平井经历长期的线性流动。考虑到在构造运动或高压气体膨胀过程中由于压缩应力和剪切应力引起的天然裂缝的存在,可以用双孔隙介质更恰当地描述页岩气储层。基于平板双孔隙的假设,本文采用三线性流模型模拟了页岩气藏中多裂口水平井的瞬态生产行为,该过程吸收了吸附气的解吸,Knudsen扩散和气滑流。页岩矩阵考虑在内。利用Stehfest数值反演算法绘制产量下降曲线,并进行敏感性分析,以确定最有影响力的储层和水力压裂参数。研究发现,天然裂缝网络的密度和渗透率是影响页岩气藏多裂缝水平井生产动态的最重要参数。天然裂缝的密度和渗透率越高,开采相同量储量所需的时间越短,这意味着投资回收期越短。本文提出的分析模型可以为页岩气储层的储量评估和产量预测提供一些见识。

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