热水对超低渗储集层微观孔喉结构的影响

doi:10.11885/j.issn.1674-5086.2012.12.04.01

摘要/Abstract

摘要：

热水驱是提高超低渗储集层采收率的重要储备技术之一。利用离心法测定了同一超低渗岩芯经40～180 ℃热
水作用后的毛管力曲线，并在此基础上分析计算了热水对孔喉大小、分布以及特征参数的影响。结果表明，热水温度
升高可使毛管力降低，最小湿相饱和度减小，并令半径小于0.03 µm 的小孔喉数量大幅减少，半径在0.03～0.81 µm 的
中等孔喉及半径大于3.22µm 大孔喉数量增多，最大连通孔喉半径增大，孔喉分选性增强，同时各种变化在热水温度
达到120 ℃以前更为明显。利用扫描电镜法对经不同温度热水作用后的超低渗岩芯块的微观孔喉形貌进行了定点扫
描，结果证实了孔喉尺寸会在热水的作用下发生改变，并观察到了微粒的运移。

关键词: 热水驱, 超低渗, 微观孔喉结构, 毛管力, 扫描电镜

Abstract:

Hot water flooding is one of the most important EOR techniques for the ultra-low permeability reservoir. Using
centrifugal method，we measured capillary pressure curves of the same ultra-low permeability core after it has soaked in
40～180 ℃ hot water for 3 days. Then based on the capillary pressure curves，we analyzed the effect of hot water on pore throat
size，distribution and characteristic parameters. The results show that，with the increasing hot water temperature，（1）the capillary
pressure decreases and the minimal wetting phase saturation reduces；（2）the quantity of small pore throats with radius
<0.03 µm greatly decreases，the quantity of moderate pore throats with radius of 0.03～0.81 µm and big pore throat with radius
>3.22 µm increases；（3）the maximal connected pore throat radius increases and the pore throat sorting enhances. Meanwhile，
all those changes are more apparent before the hot water temperature reaches 120 ℃. Using SEM，we scanned the microscopic
pore throat morphology of the same spot of an ultra-low permeability core block after it has soaked in different temperature hot
water for 3 days. The results confirm that the pore throat size changes with the influence of hot water. Simultaneously，the
migration of particles in the core can be observed.

Key words: hot water flooding, ultra-low permeability, microscopic pore throat structure, capillary force, SEM

孙琳1 *，王兵1，蒲万芬1，斯荣2，辛军3. 热水对超低渗储集层微观孔喉结构的影响[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.12.04.01.

Sun Lin1*, Wang Bing1, Pu Wanfen1, Si Rong2, Xin Jun3. The Effect of Hot Water on the Microscopic Pore Throat Structure
of Ultra-low Permeability Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.12.04.01.

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