Evaluation of Water-Alternating-Gas Efficiency when Using Wide Range of Gas Composition

International Conference on Innovations and Prospects of Development of Mining Machinery and Electrical Engineering 2018

矿业工程;电工学

Valeev, A.S.^1 ; Kotenev, Yu. A.^2 ; Mukhametshin, V. Sh.^2

LLC LUKOIL-Western Siberia, Pribaltiyskaya St., 20, Khanty-Mansi Auton. Area, Kogalym, Yugra

628486, Russia^1

Ufa State Petroleum Technological University, Kosmonavtov Street, 1, Ufa

450062, Russia^2

关键词: Component composition;    Displacement process;    Gas compositions;    Multicomponents;    Production wells;    Two layer model;    Water alternating gas;    Water displacement;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/194/8/082042/pdf
DOI  :  10.1088/1755-1315/194/8/082042

来源: IOP

【 摘 要 】

There are two methods aimed at uniform displacement of oil without any gas breakthroughs. One of such methods is the replacement of gas with a mixture of gas and water, alternating the injection of water and gas rims and another one is the decrease in gas mobility, using foam. The article is devoted to the study of the first method. The object of the study was an area of Ach reservoir of the Vyintoiskoe oil field. To assess the influence of gas composition on the displacement process, modeling of the injection of a mixture of water with both dry and wet gases was carried out. The difference in the component composition of dry and wet gases was set by assigning different values of density and viscosity. With the help of the ECLIPSE 300 the gas density determines its interaction with the oil phase by simulating multicomponent gas. For both a single-layer and a two-layer model of an oil field the exploitation indices were obtained (for gas contents in the injected water-gas mixture of 0; 10; 25; 40; 50; 60; 90; 100 %). The use of wet gas in a mixture with water makes it possible to increase the final oil recovery factor (ORF) up to 68%, which is 4% higher compared to the value of this indicator when using water (64%). These results remain valid with the gas content up to 60%. The use of mixtures enriched with gas is impractical due to the early breakthrough of gas to the production well. In comparison with the water displacement, an earlier breakthrough of gas is observed when the gas content exceeds 10%. On the contrary, when the gas content is 10%, a later breakthrough is observed. For this type of collector it is recommended to apply the mixture with gas content of 10% to achieve the optimum effect.