北京大学学报（自然科学版）

• 北京大学学报 •

人造岩芯孔喉结构的恒速压汞法评价

柴智1,师永民1,徐常胜2,张玉广3,李宏2,吴文娟1,徐洪波3,王磊1   

  1. 1. 北京大学地球与空间科学学院, 北京大学石油与天然气研究中心, 北京 100871; 2. 中国石油天然气股份有限公司新疆油田分公司采油一厂, 克拉玛依 834000; 3. 大庆油田有限责任公司采油工程研究院, 大庆 163458;
  • 收稿日期:2011-12-23 出版日期:2012-09-20 发布日期:2012-09-20

Pore-Throat Structure Evaluation of Artificial Cores with Rate-Controlled Porosimetry

CHAI Zhi1, SHI Yongmin1, XU Changsheng2, ZHANG Yuguang3, LI Hong2, WU Wenjuan1, XU Hongbo3, WANG Lei1   

  1. 1. School of Earth and Space Science, Institute of Oil and Gas, Peking University, Beijing 100871; 2. No.1 Oil Production Plant, Xinjiang Oilifeld Company, PetroChina, Karamay 834000; 3. Institute of Oil Production Engineering, Daqing Oilfield Company, Daqing 163458;
  • Received:2011-12-23 Online:2012-09-20 Published:2012-09-20

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摘要： 利用恒速压汞实验, 对3种不同工艺制作的人造岩芯孔喉特征进行研究, 并与天然岩芯实验结果进行对比。3种方法制作的人造岩芯孔隙尺度分布均十分接近, 且与天然岩芯数据吻合良好。人造岩芯喉道尺度分布集中, 相比之下天然岩芯喉道尺度分布范围较宽, 在极小的区间内也有可渗流喉道分布, 同时平均喉道半径大于人造岩芯。天然岩芯可能呈现出大孔细喉的配置关系, 存在更大的孔喉比, 因而驱油效率更低, 剩余油饱和度较人造岩芯更大。

关键词: 人造岩芯, 恒速压汞, 孔喉结构, 驱油效率

Abstract: The pore-throat structure properties of artificial cores made with three different methods are compared with the approach of rate-controlled porosimetry. The feasibility of the artificial cores to replace real cores in micro-structure experiments of reservoirs is evaluated. Pore size distribution of the artificial cores exhibits similar trait as the real core sample, while the throat size is slightly smaller, and the range is narrower compared to the real core. Meanwhile, larger pore-throat ratio may exist in real cores rather than in artificial cores, therefore the displ- acement efficiency of artificial cores is slightly higher and the residual oil saturation is lower than that of real cores.

Key words: artificial core, rate-controlled porosimetry, pore and throat structure, displacement efficiency

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