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Experimental investigation of CO2 flooding in tight oil reservoirs using CT scanning method
Yang L(杨柳)1; Kang H2; Lu XB(鲁晓兵)1; Tan XQ2; Gao J2
Source Publication4th ISRM Young Scholars Symposium on Rock Mechanics, YSS 2017
Conference Name4th ISRM Young Scholars Symposium on Rock Mechanics, YSS 2017
Conference DateMay 10, 2017 - May 13, 2017
Conference PlaceJeju, Korea, Republic of
AbstractTight oil reservoirs are characterized by ultralow permeability, causing hydrocarbons to be trapped in tiny pores and hinder the crude oil flow. CO2injection technology has been paid more attention in low-permeability reservoirs. In this work, the long core experiments of CO2flooding are conducted to study the displacement pressure and enhanced oil recovery, and CT scanning method is used to obtain the oil saturation profiles along the samples. The results show that the reservoirs pressure increases initially and decreases afterwards during CO2miscible displacement. The final reservoirs pressure is still much larger than the initial state, suggesting high energy supplement efficiency of CO2miscible displacement. At the initial stage (20 min), the pressure increases gradually, but oil saturation does not change very much. The initial oil flow is related to oil expansion induced by oil injection. After 20 min, the oil saturation at the inlet falls quickly. The oil saturation begins to decrease uniformly in the whole range of sections until the displacement front breakthrough. The sections near the inlet and outlet has larger residual oil saturation. The research is significant for understanding the microscopic mechanism of CO2flooding and enhancing oil recovery in tight oil reservoirs. © 2017 by Korean Society for Rock Mechanics.
KeywordCarbon dioxide Computerized tomography Crude oil Enhanced recovery Floods Low permeability reservoirs Oil well flooding Reservoirs (water) Rock mechanics Well flooding Displacement pressure Enhanced oil recovery Experimental investigations Long core experiments Microscopic mechanisms Miscible displacement Oil reservoirs Residual oil saturation
Indexed ByEI
Document Type会议论文
Affiliation1.Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China;
2.State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, Beijing, China
Recommended Citation
GB/T 7714
Yang L,Kang H,Lu XB,et al. Experimental investigation of CO2 flooding in tight oil reservoirs using CT scanning method[C]4th ISRM Young Scholars Symposium on Rock Mechanics, YSS 2017,2017:96-100.
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