The Effect of Surfactants on Imbibition-Sensitive Factors of Low-Permeability Reservoirs

LI Hong; LI Zhiping; WANG Xiangzeng; WANG Cai; BAI Ruiting

doi:10.11911/syztjs.201605017

Volume 44 Issue 5

Sep. 2016

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Petroleum Drilling Techniques > 2016 > 44(5): 100-103. > DOI: 10.11911/syztjs.201605017

LI Hong, LI Zhiping, WANG Xiangzeng, WANG Cai, BAI Ruiting. The Effect of Surfactants on Imbibition-Sensitive Factors of Low-Permeability Reservoirs[J]. Petroleum Drilling Techniques, 2016, 44(5): 100-103. DOI: 10.11911/syztjs.201605017

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The Effect of Surfactants on Imbibition-Sensitive Factors of Low-Permeability Reservoirs

1.
Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering(China University of Geosciences(Beijing)), Beijing, 100083, China;
2.
Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi’an, Shaanxi, 710075, China

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Received Date: March 13, 2016
Revised Date: July 30, 2016

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Abstract

Abstract

Interfacial tension and wettability are decisive factors for capillary force. Identifying the effect of surfactants on interfacial tension and wettability can be beneficial in improving the oil imbibition recovery rate in low permeability reservoirs. In this study, the effects of surfactants on the oil-water interfacial tension, surface wettability, capillary pressure and imbibition recovery were investigated through imbibition tests, spinning drop and dynamic contact angle methods, with 7 hydrophilic artificial cores with different permeability. Research results suggest that oil-water interfacial tension decreases significantly as the mass fraction of surfactant RS-1 increases, and then increases slightly before eventually becoming stable. The surfactant is highly capable in water wet surface wettability change, and can reduce the capillary pressure and improve the imbibition recovery. Results indicate that the surfactant is ostensibly capable of reducing the interfacial tension, especially with mixed surfactants which can achieve better performance than individual surfactants. Imbibition recovery is negatively correlated with the logarithm of capillary pressures and interfacial tension.
- surfactants,
- low-permeability reservoir,
- imbibition,
- interfacial tension,
- wettability,
- recovery

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References

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