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Numerical simulation for foam as sand carrying fluid during gravel packing in horizontal wells
ZHOU Shengtian1, DONG Changyin2, LI Zhaomin2, WANG Haibin1, WU Xiangyang3
(1.College of Science in China University of Petroleum, Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;3.Institute of Exploration and Development in Xingzichuan Oil Production Plant, Yanchang Oilfield, Yanan 717400, China)
Abstract:
Gravel packing has been an important completion method for horizontal wells in unconsolidated sand reservoirs, and Newtonian fluids were normally used as sand carrying fluid. As foam to be a non-Newtonian fluid, it has better carrying capability and low filtration. In the horizontal well gravel packing, early blockage can occur, which can limit the sand carrying fluid into the deep formation. In this study, a two-stage mathematical model for gravel carrying by foam fluids was established based on two-phase flow mechanism for solid-liquid flow in gravel packing process in horizontal wells. The friction factor for foam flow in horizontal wellbore was considered. The influences of well 's eccentricity, the size and density of gravels and the foam quality on the performance of gravel packing were investigated. A packing efficiency index, sand bed height index and a comprehensive evaluation index were defined as the evaluation parameters. It is concluded that well 's eccentricity has a positive effect on the performance of gravel packing, while the packing efficiency decreases with the increase of the size and density of gravels and foam quality. The gravel packing efficiency and its performance can be significantly improved in horizontal wells using foams as non-Newtonian sand carrying fluid than normal Newtonian fluids.
Key words:  horizontal well  foams  gravel packing  sand carrying fluid  numerical simulation  solid-liquid two phase flow