Drilling sequence optimization model and its solution method for offshore cluster wells

Key words:  offshore cluster wells  drilling sequence  optimization model  anti-collision  batch drilling  genetic algorithm

Abstract:

Due to more wells and small wellhead space of offshore cluster wells, optimizing drilling consequence is helpful for anti-collision and batch drilling. Considering the anti-collision and the requirements of batch drilling, the wellbore separation factor was selected as the evaluation index of the wellbore collision risk assessment, and the minimum total length of anti-collision intervals of the whole cluster was selected as the optimal index of drilling consequence optimization to establish a mathematical drilling consequence optimization model and a genetic algorithm for offshore cluster wells. Also a living example was solved and discussed. The results show that it is feasible to select the minimum total length of anti-collision intervals as the optimal index to establish the drilling consequence optimization model. The drilling consequence optimization method can satisfy the requirements of anti-collision and batch drilling for offshore cluster wells.