The Effect of Hot Water on the Microscopic Pore Throat Structure
of Ultra-low Permeability Reservoir

doi:10.11885/j.issn.1674-5086.2012.12.04.01

Abstract

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

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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