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Evaluation of Productivity Index in Unconventional Reservoir Systems: An Extended Distributed Volumetric Sources Method
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.jngse.2018.10.011
Mohammad Bagher Asadi , Sohrab Zendehboudi

Abstract Horizontal drilling and hydraulic fracturing technologies make the production of unconventional reservoirs practically and economically feasible. The combination of these two techniques leads to complex well-reservoir systems. Distributed Volumetric Source (DVS) can be utilized as an effective methodology to evaluate the production of hydrocarbons from a complex configuration of fractured/non-fractured wells (both vertical and horizontal) in a well-reservoir system. This study modifies the DVS method through generalizing the solution for different boundary conditions and improving the accuracy of the method at the infinite acting conditions. The DVS method is introduced as an appropriate replacement to the influence function in the common/conventional Multi-Well Productivity Index (MPI) method because of its capability to capture the production mechanisms and production index over both transient and pseudo-steady state regimes, by employing a single influence function so that the internal well fluid flow can be coupled to the fluid flow in the reservoir. The horizontal well still remains a challenging configuration. It is found that the impact of the well penetration ratio on the productivity of horizontal well during the production time can be properly modeled by the DVS method. Due to the low precision of the common (original version of) DVS method at early times, a new solution method based on Fourier integral is proposed and the accuracy is systematically examined. Hence, DVS is employed to circumscribe the infinite-acting response of this well configuration. Finally, a new methodology is proposed to optimize the design of Multi-Fractured Horizontal Well (MFHW). According to the output of this study, the extended DVS procedure offers a better plan in terms of technical and economic aspects to design MFHW, compared to conventional solution techniques.

中文翻译:

非常规油藏系统生产力指数评价:一种扩展的分布式体积源方法

摘要 水平钻井和水力压裂技术使非常规油藏的生产具有现实和经济可行性。这两种技术的结合导致了复杂的油藏系统。分布式体积源 (DVS) 可用作一种有效的方法来评估井储层系统中压裂/非压裂井(垂直和水平)的复杂配置的碳氢化合物产量。本研究通过推广不同边界条件的解并提高该方法在无限作用条件下的精度,修改了 DVS 方法。DVS 方法被引入作为普通/常规多井生产力指数 (MPI) 方法中影响函数的适当替代,因为它能够捕获瞬态和伪稳态状态下的生产机制和生产指数,通过采用单一影响函数,使得内部井流体流动可以耦合到储层中的流体流动。水平井仍然是一个具有挑战性的配置。结果表明,在生产期间,井贯入比对水平井产能的影响可以通过 DVS 方法进行适当建模。针对早期常见的(原版)DVS方法精度不高的问题,提出了一种基于傅立叶积分的新求解方法,并对其精度进行了系统检验。因此,DVS 用于限制这种井配置的无限作用响应。最后,提出了一种新的方法来优化多裂缝水平井(MFHW)的设计。根据本研究的结果,与传统求解技术相比,扩展 DVS 程序在设计 MFHW 的技术和经济方面提供了更好的计划。
更新日期:2019-01-01
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