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Transient transfer shape factor for fractured tight reservoirs: Effect of the dynamic threshold pressure gradient in unsteady flow
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/ese3.686 Kai Liu 1, 2 , Daiyin Yin 1, 2 , Haibo Su 3, 4
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/ese3.686 Kai Liu 1, 2 , Daiyin Yin 1, 2 , Haibo Su 3, 4
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In fractured tight reservoirs, the seepage capacity of the matrix is poor, and fluid migration mainly depends on matrix/fracture transfer. An accurate understanding of the matrix/fracture flow is the basis of well tests and numerical simulations for tight reservoirs. In this paper, the unsteady flow equation for tight reservoirs is deduced based on the boundary layer theory, which can reflect the effect of the dynamic threshold pressure gradient, and the theoretical flow equation is verified by seepage experiments. Based on the study of the flow equation, the approximate semi‐analytical solution of the matrix/fracture unsteady transfer shape factor and the transfer function for tight reservoirs are established considering the early stage of matrix/fracture transfer (pressure does not propagate to the matrix center) and the late stage of matrix/fracture transfer (pseudo‐steady state). The results show that the shape factor of the tight reservoir is mainly affected by three factors (minimum threshold pressure gradient, static boundary layer thickness, and sensitivity coefficient of the fluid boundary layer), and the theoretical curves show that the intermediate transfer enters the pseudo‐steady state when the dimensionless time reaches approximately 0.14. The higher the minimum threshold pressure gradient is, the larger the transfer shape factor. The larger the static boundary layer thickness is, the larger the transfer shape factor; additionally, the larger the sensitivity coefficient of the fluid boundary layer is, the faster the change rate of the shape factor. Finally, the transfer shape factor is applied to a well test interpretation. Examples prove that the fitting accuracy of the new curve type is improved by 34.2% compared with the curve type for the conventional well test interpretation method.
中文翻译：
裂缝性致密油藏的瞬态传递形状因子：非恒定流中动态阈值压力梯度的影响
在裂缝性致密油藏中，基质的渗透能力很差，流体运移主要取决于基质/裂缝的转移。对基质/裂缝流的准确了解是致密油藏试井和数值模拟的基础。本文基于边界层理论推导了致密储层的非稳态渗流方程，可以反映动态阈值压力梯度的影响，并通过渗流实验验证了理论渗流方程。根据对流动方程的研究，考虑到基质/裂缝转移的早期阶段（压力不传播到基质中心）和基质/裂缝的后期阶段，建立了基质/裂缝非稳态传递形状因子的近似半解析解和致密油藏的传递函数。骨折转移（伪稳态）。结果表明，致密油藏的形状因子主要受最小压力梯度，静边界层厚度和流体边界层敏感性系数这三个因素的影响，理论曲线表明，中间输导进入了虚拟。 -无量纲时间达到约0.14时的稳态。最小阈值压力梯度越高，传递形状因子越大。静态边界层的厚度越大，转印形状系数越大；另外，流体边界层的灵敏度系数越大，形状因子的变化率越快。最后，将传递形状因子应用于试井解释。实例证明，与传统的试井解释方法相比，新曲线类型的拟合精度提高了34.2％。
更新日期：2020-05-25
中文翻译：
裂缝性致密油藏的瞬态传递形状因子：非恒定流中动态阈值压力梯度的影响
在裂缝性致密油藏中，基质的渗透能力很差，流体运移主要取决于基质/裂缝的转移。对基质/裂缝流的准确了解是致密油藏试井和数值模拟的基础。本文基于边界层理论推导了致密储层的非稳态渗流方程，可以反映动态阈值压力梯度的影响，并通过渗流实验验证了理论渗流方程。根据对流动方程的研究，考虑到基质/裂缝转移的早期阶段（压力不传播到基质中心）和基质/裂缝的后期阶段，建立了基质/裂缝非稳态传递形状因子的近似半解析解和致密油藏的传递函数。骨折转移（伪稳态）。结果表明，致密油藏的形状因子主要受最小压力梯度，静边界层厚度和流体边界层敏感性系数这三个因素的影响，理论曲线表明，中间输导进入了虚拟。 -无量纲时间达到约0.14时的稳态。最小阈值压力梯度越高，传递形状因子越大。静态边界层的厚度越大，转印形状系数越大；另外，流体边界层的灵敏度系数越大，形状因子的变化率越快。最后，将传递形状因子应用于试井解释。实例证明，与传统的试井解释方法相比，新曲线类型的拟合精度提高了34.2％。
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