线性规划在优化钻机动迁方案中的应用

钻井工程是油气田开发过程中的投资大项，而钻机服务费又是总钻井成本的主要构成，通过优化项目开发期 间的钻机动迁方案，可以有效降低投资成本。结合工作实践，针对如何在开发期内优化钻机动迁的问题，探讨了混合 整数线性规划方法在伊拉克哈法亚油田钻机动迁方案优化中的应用，为项目运作的合理安排提供了科学的决策依据。 不同于传统的钻机年度计划安排，混合整数线性规划利用了整个开发期的信息，以最小化钻机服务费为目标函数，根 据年度钻井数量确定约束条件，优化模型求得开发期内每年需要各种钻机的数量。模型解优于年度钻机动迁计划，同 时模型适应性强，响应快，最优解会根据工作量和约束条件的变化而调整，可以有效地提高工作效率。

Application of Mixed Integer Linear Program in Optimization of#br# Drilling Rig Mobilization

Drilling operation is capital intensive in oilfield development，and drilling rig service fee makes up a major part in drilling investment. Thus，to assist management in decision making and to improve IRR of the investment，a Mixed Integer Linear Program（MILP）is proposed to optimize drilling rig mobilization in the development of Halfaya Oilfield in Iraq. Instead of scheduling rig mobilization for each individual year，the MILP integrates information of the entire development period to make mobilization plan throughout the whole period. Given the scope of work specified in development plan，the MILP searches for the optimal solution，namely，the numbers of drilling rigs of each type needed every year，with the objective of minimizing total cost and meeting annual workload. As expected，the optimal solutions evolve and the objective function improves as more information is taken into account. In addition，the MILP is adaptive and works well in dynamic setting，such as varying length of development period and workloads. The paper first introduces linear programming to drilling rig mobilization and will extend applications of operation research techniques in oil and gas industry.