CT coreflood study of foam flow for enhanced oil recovery: The effect of oil type and saturation

被引:36
|
作者
Tang, Jinyu [1 ]
Vincent-Bonnieu, Sebastien [1 ,2 ]
Rossen, William R. [1 ]
机构
[1] Delft Univ Technol, Dept Geosci & Engn, Stevinweg 1, NL-2628 CN Delft, Netherlands
[2] Shell Global Solut Int, NL-2288 Rijswijk, Netherlands
关键词
Enhanced oil recovery; Foam flow with oil; CT corefloods; Simulation; POROUS-MEDIA; IMMISCIBLE FOAM; RESIDUAL OIL; SIMULATION; DISPLACEMENT; TRANSIENT;
D O I
10.1016/j.energy.2019.116022
中图分类号
O414.1 [热力学];
学科分类号
摘要
We present a CT coreflood study of foam, both pre-generated and generated in-situ, displacing oil, as a function of oil type and saturation. Foam generation and propagation are reflected through sectional pressure measurements. Dual-energy CT imaging monitors in-time phase saturations. With an oil less harmful to foam (hexadecane), injection with and without pre-generation of foam exhibits similarities: propagation of a foam bank through a core and later refinement of foam texture. In contrast, with an oil destabilizing to foam (with 20 wt% oleic acid in the hexadecane), pre-generation of foam behaves very differently from co-injection, suggesting very-different effects on foam generation and propagation. Without pre-generation, strong-foam generation is very difficult even at residual oil saturation (about 0.1); generation finally starts from the outlet (likely a result of the capillary-end effect). This strong-foam state propagates upstream very slowly. Pre-generated foam shows two stages of propagation, both from the inlet to outlet. First, weak foam displaces most of the oil, followed by a propagation of stronger foam at lower oil saturation. This dependence on injection method with harmful oil is not represented in currently applied foam models, which need further improvements for reliable prediction of foam for enhanced oil recovery. (C) 2019 Elsevier Ltd. All rights reserved.
引用
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页数:11
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