Aqueous formate solution for enhanced water imbibition in oil recovery and carbon storage in carbonate reservoirs

被引:13
|
作者
Wang, Hao [1 ]
Oyenowo, Oluwafemi Precious [1 ]
Okuno, Ryosuke [1 ]
机构
[1] Univ Texas Austin, Hildebrand Dept Petr & Geosyst Engn, Austin, TX 78712 USA
关键词
Formate; Wettability alteration; Carbon sequestration; Water imbibition; Carbonate formation; Enhanced oil recovery; WETTABILITY ALTERATION; BRINE COMPOSITION;
D O I
10.1016/j.fuel.2023.128198
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
This paper presents an experimental study of the injection of aqueous formate solution into oil-wet carbonate porous media at different formate concentrations and acidity levels. The research was motivated by the potential use of aqueous formate solution as a wettability modifier in enhanced oil recovery and/or a carbon carrier in geological carbon storage in carbonate reservoirs. However, the wettability alteration of carbonate rocks by formate has not been tested at elevated concentrations of formate or in any coreflood. The experimental program in this research consists of aqueous stability, wettability alteration, and three dynamic imbibition experiments with fractured carbonate cores with varying formate concentrations up to 30 wt% and initial pH between 6 and 7.With an excess amount of calcite powder, the 20 wt% formate solution in 15000 ppm NaCl brine showed essentially the same pH history as the base NaCl brine, where calcite dissolution caused the solution pH to in-crease to a stable value near 9. None of the samples studied in this research showed solid precipitation. Material balance of dynamic imbibition data indicated that the imbibition of formate into the matrix was most significant in coreflood #1, in which 30 wt% formate solution was injected into a fractured carbonate core. A large gradient in formate concentration between the fracture and the matrix likely caused the rapid mass transfer. Then, calcite dissolution and the resulting formate species caused wettability alteration to enhance water imbibition, which in turn expelled the oil in the matrix.The incremental oil recovery factor was 9.1 % for 30 wt% formate (pH = 7; coreflood #1), 2.9 % for 5 wt% formate (pH = 7; coreflood #2), and 7.0 % for 5 wt% formate + HCl (pH = 6; coreflood #3). A greater oil recovery factor resulted from a greater concentration of formate and a reduced pH. This is the first time core -floods were performed with aqueous formate solution at elevated concentrations up to 30 wt%.
引用
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页数:15
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