首页|The effects of various factors on spontaneous imbibition in tight oil reservoirs
The effects of various factors on spontaneous imbibition in tight oil reservoirs
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Slickwater fracturing fluids have gained widespread application in the development of tight oil reser-voirs.After the fracturing process,the active components present in slickwater can directly induce spontaneous imbibition within the reservoir.Several variables influence the eventual recovery rate within this procedure,including slickwater composition,formation temperature,degree of reservoir fracture development,and the reservoir characteristics.Nonetheless,the underlying mechanisms gov-erning these influences remain relatively understudied.In this investigation,using the Chang-7 block of the Changqing Oilfield as the study site,we employ EM-30 slickwater fracturing fluid to explore the effects of the drag-reducing agent concentration,imbibition temperature,core permeability,and core fracture development on spontaneous imbibition.An elevated drag-reducing agent concentration is observed to diminish the degree of medium and small pore utilization.Furthermore,higher tempera-tures and an augmented permeability enhance the fluid flow properties,thereby contributing to an increased utilization rate across all pore sizes.Reduced fracture development results in a lower fluid utilization across diverse pore types.This study deepens our understanding of the pivotal factors affecting spontaneous imbibition in tight reservoirs following fracturing.The findings act as theoretical,technical,and scientific foundations for optimizing fracturing strategies in tight oil reservoir transformations.
Tight oil reservoirSpontaneous imbibitionNuclear magnetic resonanceSlickwater fracturing fluidFluid utilization degree
Cheng Liu、Tian-Ru Wang、Qing You、Yue-Chun Du、Guang Zhao、Cai-Li Dai
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School of Energy Resources,China University of Geosciences,Beijing,100083,PR China
School of Petroleum Engineering,China University of Petroleum,Qingdao,266580,Shandong,PR China
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