Research on Hydraulic Calculation Method of Branch Ring Waterflood Network

Abstract In order to meet the demand of water injection, a multi-source branch annular water injection network is formed through the lap of the trunk lines between pumping stations in the oilfield to realize mutual water refill. Because of the uncertainty of water distribution at the lap of the trunk line, it is impossible to calculate the water distribution directly from the pumping station to the branch line and single well. Aiming at the water injection pipe network system, the reverse calculation method of the total water quantity from the injection well to the water distribution room, branch line and main line is proposed. The reverse calculation method is used to calculate the excess water quantity at the connection of the simple branch ring water injection pipe network. For the complex multi-ring nested water injection pipe network, topological relation matrix is established based on graph theory, and combined with reverse calculation method, the topological relation is simplified and the order of matrix is reduced, which provides a new idea for the hydraulic calculation of dendritic ring water injection pipe network.