In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs.However,it is a challenge to achieve in-depth profile control.In this paper,two types of organic...In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs.However,it is a challenge to achieve in-depth profile control.In this paper,two types of organic gel systems,namely s-MPG and MSRG,tailored for fractured-vuggy reservoirs with 140℃ and 22×10^(4) mg/L have been developed.FTIR was used to analyze the functional groups of s-MPG and MSRG.Additionally,the quality retention rates of s-MPG and MSRG were assessed using TG-DSC,yielding results of 92.85%and 92.65%,respectively.The dilution rates of s-MPG and MSRG are found to be 18.69%and 26.69%,respectively,demonstrating excellent compatibility and adaptability.The enhancement performance depends on the synergistic effect that the anti-dilution s-MPG effectively separates bottom water,while high-strength MSRG separates the oil layer.Moreover,the EOR perfor-mances of s-MPG synergy with MSRG in various types of fractured-vuggy carbonate models were also evaluated.The highest oil recovery of 12%is achieved in fracture network model.Laboratory results indicate that the synergistic combination of s-MPG and MSRG for water plugging in fractured-vuggy carbonate reservoirs results in a more effective enhancement of oil recovery compared to using a sin-gle gel system for plugging.Finally,the s-MPG synergy with MSRG has been applied in actual fractured-vuggy carbonate reservoirs.As expected,the water cut of typical well is reduced from 100%to 30%and the increased oil production is 1142 t totally.Therefore,this study presents a novel approach to achieving in-depth profile control by leveraging the synergistic effect of s-MPG with MSRG in fractured-vuggy carbonate reservoirs.展开更多
A new Mg−10%Al−1%Zn−1%Si alloy with non-dendritic microstructure was prepared by strain induced melt activation(SIMA)process.The effect of compression ratio on the evolution of semisolid microstructure of the experime...A new Mg−10%Al−1%Zn−1%Si alloy with non-dendritic microstructure was prepared by strain induced melt activation(SIMA)process.The effect of compression ratio on the evolution of semisolid microstructure of the experimental alloy was investigated.The results indicate that the average size ofα-Mg grains decreases and spheroidizing tendency becomes more obvious with the compression ratios increasing from 0 to 40%.In addition,the eutectic Mg2Si phase in the Mg−10%Al−1%Zn−1%Si alloy transforms completely from the initial fishbone shape to globular shape by SIMA process.With the increasing of compression ratio,the morphology and average size of Mg2Si phases do not change obviously.The morphology modification mechanism of Mg2Si phase in Mg−10%Al−1%Zn−1%Si alloy by SIMA process was also studied.展开更多
基金support of Sinopec Northwest Oilfield Company,Xinjiang Urumqi(Grant No.KJ202336).
文摘In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs.However,it is a challenge to achieve in-depth profile control.In this paper,two types of organic gel systems,namely s-MPG and MSRG,tailored for fractured-vuggy reservoirs with 140℃ and 22×10^(4) mg/L have been developed.FTIR was used to analyze the functional groups of s-MPG and MSRG.Additionally,the quality retention rates of s-MPG and MSRG were assessed using TG-DSC,yielding results of 92.85%and 92.65%,respectively.The dilution rates of s-MPG and MSRG are found to be 18.69%and 26.69%,respectively,demonstrating excellent compatibility and adaptability.The enhancement performance depends on the synergistic effect that the anti-dilution s-MPG effectively separates bottom water,while high-strength MSRG separates the oil layer.Moreover,the EOR perfor-mances of s-MPG synergy with MSRG in various types of fractured-vuggy carbonate models were also evaluated.The highest oil recovery of 12%is achieved in fracture network model.Laboratory results indicate that the synergistic combination of s-MPG and MSRG for water plugging in fractured-vuggy carbonate reservoirs results in a more effective enhancement of oil recovery compared to using a sin-gle gel system for plugging.Finally,the s-MPG synergy with MSRG has been applied in actual fractured-vuggy carbonate reservoirs.As expected,the water cut of typical well is reduced from 100%to 30%and the increased oil production is 1142 t totally.Therefore,this study presents a novel approach to achieving in-depth profile control by leveraging the synergistic effect of s-MPG with MSRG in fractured-vuggy carbonate reservoirs.
基金The authors are grateful for the financial supports from the National Natural Science Foundation of China(Nos.41807235,50674038).
文摘A new Mg−10%Al−1%Zn−1%Si alloy with non-dendritic microstructure was prepared by strain induced melt activation(SIMA)process.The effect of compression ratio on the evolution of semisolid microstructure of the experimental alloy was investigated.The results indicate that the average size ofα-Mg grains decreases and spheroidizing tendency becomes more obvious with the compression ratios increasing from 0 to 40%.In addition,the eutectic Mg2Si phase in the Mg−10%Al−1%Zn−1%Si alloy transforms completely from the initial fishbone shape to globular shape by SIMA process.With the increasing of compression ratio,the morphology and average size of Mg2Si phases do not change obviously.The morphology modification mechanism of Mg2Si phase in Mg−10%Al−1%Zn−1%Si alloy by SIMA process was also studied.
