剪切变稀作用对聚驱试井分析影响的数值研究

Numerical Study on the Impact of Shear Thinning Behavior in Well Test Analysis for Polymer Flooding

贾智淳 闫术 董晓芳 李道伦 卢德唐

JIAZhichun YANShu DONGXiaofang LIDaolun LUDetang

中国科学技术大学近代力学系, 安徽 合肥 230026 中国石油大庆油田有限责任公司测试技术服务分公司, 黑龙江 大庆 163453 合肥工业大学数学学院, 安徽 合肥 230009

Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230026, China Well Logging Technology Service Company of Daqing Oilfield Company Ltd., PetroChina, Daqing, Heilongjiang 163453, China School of Mathematics, Hefei University of Technology, Hefei, Anhui 230009, China

考虑聚合物驱中剪切、吸附、不可及孔隙体积等物化现象影响，建立了耦合井储与地层渗流的两相四组分的聚合物驱模型。基于PEBI网格、采用有限体积法进行离散并用全隐式方法进行求解，形成了聚合物驱数值试井模型；研究了剪切变稀作用对聚驱井底瞬态压力响应的影响，发现由于聚合物溶液剪切变稀特性和关井后井周围水相速度的急剧降低，压力导数曲线在井储段结束后会出现明显的抖动。地层渗透率的变化会导致导数曲线抖动的位置发生明显变化但对抖动的幅度影响很小。基于以上结论给出了考虑剪切变稀作用的聚驱数值试井拟合方法。通过对油田现场压力测试数据的拟合验证了上述规律的正确性并表明该规律对合理解释现场压力测试资料，正确反演地层参数有很大指导意义。

Considering the shear thinning effect, adsorption and inaccessible pore volume, a 3-D two-phase four-component well testing model for polymer flooding was established. Based on PEBI grid, the finite volume method was used to solve the polymer flooding model, and a well testing software for polymer flooding was developed. We studied the influence of shear thinning effect on wellbore pressure, and the results show that shear thinning effect may result in a sudden drop of the pressure derivative curves. This discovery accords with the actual measured results of oil field,and is instructive to well testing analysis and formation parameter inversion.

10.11885/j.issn.16745086.2014.11.28.02