聚合物流变性对非均质油藏波及效率的影响

doi:10.11885/j.issn.1674-5086.2016.08.29.01

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (1): 157-164.DOI: 10.11885/j.issn.1674-5086.2016.08.29.01

聚合物流变性对非均质油藏波及效率的影响

胡科^1,2, 薛新生^1,2, 康晓东^1,2, 冯茹森³

1. 海洋石油高效开发国家重点实验室, 北京朝阳 100028;
2. 中海油研究总院, 北京朝阳 100028;
3. “油气藏地质及开发工程”国家重点实验室·西南石油大学, 四川成都 610500

收稿日期:2016-08-29 出版日期:2018-02-01 发布日期:2018-02-01
通讯作者: 胡科,E-mail:huke@cnooc.com.cn
作者简介:胡科,1986年生,男,汉族,湖北钟祥人,工程师,硕士,主要从事化学驱提高采收率方面的工作。E-mail:huke@cnooc.com.cn;薛新生,1970年生,男,汉族,河北新河人,高级工程师,博士,主要从事提高采收率技术研究工作。E-mail:xuexsh@cnooc.com.cn;康晓东,1978年生,男,汉族,河南许昌人,高级工程师,博士,主要从事油气田开发方面的工作。E-mail:kangxd@cnooc.com.cn;冯茹森,1972年生,男,汉族,吉林四平人,副教授,博士,主要从事提高采收率理论与技术研究工作。E-mail:gs_frs@163.com
基金资助:
“十三五”国家科技重大专项（2016ZX05025-003）

Effects of Polymer Rheology on Sweep Efficiency of Heterogeneous Oil Reserves

HU Ke^1,2, XUE Xinsheng^1,2, KANG Xiaodong^1,2, FENG Rusen³

1. State Key Laboratory of Offshore Oil Exploitation, Chaoyang, Beijing 100028, China;
2. CNOOC Research Institute, Chaoyang, Beijing 100028, China;
3. State Key Laboratory of Geology and Production, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2016-08-29 Online:2018-02-01 Published:2018-02-01

摘要/Abstract

摘要： 研究聚合物溶液的流变性与其在非均质油藏中渗流特性之间的关系，可为进一步发挥聚合物驱在海上油田的应用效果提供理论依据。结合海上某油田砂岩稠油油藏实际的非均质性特征，研制出一种能在高压下模拟驱油体系在油藏深部渗流的层内非均质性二维可视填砂模型，实验筛选出同一剪切速率下，剪切黏度近似相等，但流变性差异较大的3种驱油体系，并以固定剪切速率的注入方式进行渗流实验。实验表明，3种驱油体系驱替后，在模型中均呈现楔形的剩余油分布状态，但透光面积和渗流规律存在较大差异。聚合物溶液的流变性能够延缓注水进入无效循环的阶段，从而改善低渗透层的水驱油波及效率，表现为幂律指数n越小，波及效率越高。

关键词: 聚合物, 黏度, 流变性, 非均质, 幂律指数, 波及效率

Abstract: Studies on the relationship between polymer solution rheology and the seepage characteristics in heterogeneous oil reserves provide a useful theoretical basis to improve the efficacy of polymer flooding in offshore oilfields. On the basis of the actual heterogeneity of heavy oil reservoirs in the sandstones of an offshore oilfield, we developed a two-dimensional visual sand-packed model capable of simulating reservoir heterogeneities in the seepage of oil displacement systems within the deeper parts of an oil reservoir, under high pressures. In this work, we performed a rheology experiment using injections with a fixed shear rate on three oil displacement systems. These displacement systems have significantly different rheologies, but similar shear viscosities at the same shear rate. It was shown in this experiment that oil displacement using these three oil displacement systems always resulted in wedge-shaped residual oil distributions within the similitude model. However, there were significant differences between these systems in their transparent areas and seepage patterns. It was shown that polymer solution rheology can delay the onset of ineffective cycling during fluid injections, thus improving the sweep efficiency of oil displacement in low-permeability reservoirs, resulting in increases in sweep efficiency with decreases in the power law exponent, n.

Key words: polymers, viscosity, rheology, heterogeneous, power law exponent, sweep efficiency

中图分类号:

TE357

胡科, 薛新生, 康晓东, 冯茹森. 聚合物流变性对非均质油藏波及效率的影响[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 157-164.

HU Ke, XUE Xinsheng, KANG Xiaodong, FENG Rusen. Effects of Polymer Rheology on Sweep Efficiency of Heterogeneous Oil Reserves[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 157-164.

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聚合物流变性对非均质油藏波及效率的影响

Effects of Polymer Rheology on Sweep Efficiency of Heterogeneous Oil Reserves

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