Título del libro: Spe Latin American And Caribbean Petroleum Engineering Conference Proceedings
Título del capítulo: Inflow performance relationship equation for solution gas-drive reservoirs under gravity segregation
ROBERTO PADILLA SIXTO; RODOLFO GABRIEL CAMACHO VELAZQUEZ;
Autores externos:
Idioma:
Año de publicación:
2014
Palabras clave:
Drainage; Flow of fluids; Oil wells; Petroleum reservoir engineering; Productivity; Boundary dominated flow; Gravity segregation; Inflow performance relationships; Linear approximations; Measurement positions; Naturally fractured reservoirs; Productivity coefficients; Solution-gas drive reservoirs; Oil field development
Resumen:
Based on synthetic results obtained by Padilla and Camacho for the fluid flow of gas and oil in reservoirs producing by solution gas-drive (SGD) and gravity drainage (GS), in this paper the behavior of the oil mobility function in partially and fully penetrated wells is studied; also its influence on the development of a practical IPR equation is analyzed. It is concluded that the Fetkovich's straight line approximation with an ordinate to the origin equal to zero is valid only when the production comes from the middle of the production thickness with and without gravitational effects. Also, changes of the gas saturation with depth due to the influence of gravity drainage and also the measurement position causes that the ordinate of the mobility function, X(p) = ap+b, be different from zero; however, this linear approximation is reasonable at long producing times during the boundary dominated flow period around the wellbore. For partially penetrated wells this consideration is not entirely appropriate. Considering the above results, a productivity coefficient (?) defined as the ratio of oil to the total productivity index is defined. A quadratic IPR equation valid for any position of the production interval is derived. The quadratic flow efficiency definition given by Camacho and Raghavan is considered. A table of normalized reference equations for different productivity coefficient values is presented, where the classic equations of Vogel, Fetkovich and constant productivity index are particular cases. Finally normalized cubic correlations for totally and partially penetrated wells also are obtained. The equations were proved with information of real field cases of saturated naturally fractured reservoirs (NFR's) of Mexico. © 2014, Society of Petroleum Engineers.
Entidades citadas de la UNAM:
ISBN:
9781632668882
Editorial:
Society of Petroleum Engineers (SPE)
