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Enhanced oil recovery by low-salinity water spontaneous imbibition (LSW-SI) in a typical tight sandstone formation of mahu sag from core scale to field scale

引用

Petroleum 2021年第3期7卷 272-281页

作者： Bing Wei Lele Wang Tao Song Mengying Zhong Mikhail A.Varfolomeev State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Department of Petroleum Engineering Kazan Federal UniversityKremlevskaya Str.18Kazan420008Russia

Accelerating mass exchange between matrix and fractures is the essence of enhanced oil recovery(EOR)in tight formations after natural *** salinity water(LSW)injection has been commerciallyproven in conventional reservoirs EOR,with scale projects in progress *** is,however,a lack of understanding of the EOR effect in tight ***,in this work,we introduced LSWEOR to a target tight formation using huff-puff *** imbibition(SI)tests were firstly performed on homogenous Berea sandstone cores with decreasing salinity brine to observe the production *** results indicated that the oil recovery of the tight rock was boosted by tuning brine *** all the used brines with salinity ranging from 0.021%to 2.1%TDS(total dissolved salinity),the 0.21%TDS brine showed a rapid increase in oil production over imbibing time,which finally led to an incremental oil recovery of 4.5%OOIP(original oil in place).Core-scale modeling was conducted by history-matching the oil recovery dynamics of the SI results through modifying capillary pressure and relative permeability.A full-scale reservoir model was constructed using micro-seismic data to model fracture geometry combing fracturing results and scaling parameters obtained from core scale *** is proven that LSW huff-n-puff stimulated the oil production after natural depletion and improved MEE(mass exchange efficiency)of the target formation,but the EOR benefit was not comparable to CO2 and surfactant-assisted water huff-puff methods.

关键词： fractured tight formation Enhanced oil recovery Low-salinity effect Spontaneous imbibition Huff-n-puff

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