Optimization of target segment parameters of fishbone horizontal well based on genetic algorithm

Abstract

The optimization of target parameters of the fishbone horizontal wells is the key to improving single well production capacity and development results. Therefore, in order to improve the development of the fishbone horizontal wells, it is very important that influencing rules of the target segment parameters of the fishbone horizontal well on their production capacity should be studied, and the optimization methods of target segment geometric parameters and wall inflow control parameters are given to achieve the maximum production capacity of horizontal barbed wells and the homogenization of the inflow profile of the target segment. Based on the equivalent caliper model, this study establishes a coupling model between seepage and wellbore tubular flow in fishbone horizontal well reservoirs, and analyzes the effects of target segment parameters on the fishbone horizontal well productivity and the inflow profile of the target segment. Combined with the genetic algorithm, The segmental optimization method for the inflow control parameters of the target segment wall solves the problem of scientific optimization design of the perforation parameters of the target segment of the fishbone horizontal wells. The research shows that the inhomogeneity of the permeability along the wellbore is the main influencing factor for the optimal design of the inflow control parameters of the target section, and the impact on the inflow profile of the target section is more sensitive than the pressure drop of the wellbore; the perforation density of the high-permeability target section after optimization is small. The perforation density of the low-permeability target segment is large, thereby reducing the inflow velocity of the high-penetration target segment, increasing the inflow velocity of the low-penetration target segment, and maximizing the uniform inflow of the target segment.