利用数字岩心技术评价松散砂岩渗流敏感性

Jin Pang, Junnan Li, Jie Liang, Xiaolu Wang, Mingqing Kui
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引用次数: 1

摘要

松散砂岩气藏采出岩心完整性差,易发生水化和坍塌,传统岩心驱油实验难以准确评价其敏感性特征。利用数字岩心技术研究了地层水浸泡时间的应力敏感性和水敏感性。以疏松砂岩气藏岩心为研究对象,利用CT扫描仪对岩心样品进行扫描。可以获得岩心的三维图像,提取数字信息,将多孔介质的孔隙结构直接映射到网络中,并利用分形几何原理建立数字岩心。还可以提取三维孔隙网络模型。接下来,我们可以根据真实的核心实验结果对模型计算的结果进行比较和校正,从而得到一个客观有效的数字核心模型。最后,计算出不同地层水损伤次数下的有效应力、孔喉参数(孔喉半径、形状因子、配位数、孔喉比)和相对渗透率。研究结果表明,在砂岩气藏开发过程中,随着有效应力的不断增大,岩石孔喉参数不断减小,最终储集岩渗透率下降幅度大于43.2%。黏土矿物在边底水侵入储层并长期浸泡后会发生膨胀,30天内孔喉明显变窄,30天以上孔喉变化不大,最终储集岩渗透率下降幅度可达5.7%。研究结果为松散砂岩气藏的开发提供了重要的基础岩石物理资料,进而为气藏合理产气量的制定提供了科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of the Percolation Sensitivity of Loose Sandstone Using Digital Core Technology
The integrity of the extracted core in loose sandstone gas reservoirs is poor, and because hydration and collapse easily occur, it is difficult to evaluate the sensitivity characteristics accurately by the traditional core flooding experiments.We instead investigate the stress sensitivity and water sensitivity of the formation water soaking time using digital core technology.We take the core of a loose sandstone gas reservoir as a research object and begin by scanning the core samples with a CT scanner. A three-dimensional image of the core can be obtained, the digital information extracted, the pore structure of the porous media mapped directly to the network, and a digital core established using the principles of fractal geometry. The three-dimensional pore network model can also be extracted. Next, we can compare and correct the results calculated by the model based on the real core experimental results, and an objective and effective digital core model can be obtained.Finally, we can calculate the different effective stress, pore throat parameters (pore throat radius, shape factor, coordination number, pore-throat ratio) and relative permeability of different formation water injury times. The research results demonstrate that in sandstone gas reservoir development, as the effective stress continuously increases, the rock pore-throat parameters continue to decrease, and the permeability of the reservoir rock ultimately declines by more than 43.2%. Clay minerals will expand after the edge and bottom water intrude into the reservoir and soak it for a long time: the pore throat is significantly narrowed within 30 days, while after 30 days more, the pore throat undergoes any only slight further changes, and the final permeability decline of the reservoir rock is up to 5.7%. The research results provide important basic petrophysical data for the development of loose sandstone gas reservoirs which, in turn, provide a scientific basis for formulating a reasonable gas production rate in a gas reservoir.
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