Trajectory Optimization for Gas Hydrate Well in Deepwater: Wellbore Stability and Sand Control

摘要

The paper established an optimization model to optimize 3D welltrajectory of gas hydrate in deepwater considering wellbore stabilityand sand control. The sensitivity analysis of wellbore stability andcritical production pressure related to inclination angle and azimuthangle is made for well trajectory optimization. The optimizationmodel of well trajectory takes drilling depth as objective function andwellbore stability, critical production pressure, kick-off point anddogleg severity as constraints. Artificial bee colony algorithm isadapted for calculating the established model. A case study ispresented and it indicates that the established model, in which theeffects of wellbore stability and critical production pressure isassessed, is able to optimize the trajectory for gas hydrate well.