One important issue in the mid to late development stages of oilfields is maintaining stable production, especially when the existing gathering pipeline system cannot fully satisfy the development of low pressures and low production rates. In these cases, it is necessary to restructure the original gathering pipeline system. In this study, an optimal design method is proposed to restructure a pipeline system in an oilfield in the mid to late development stages. Based on the demand of stable production and the existing structure of the pipeline system, a mixed-integer nonlinear programming (MINLP) model with an objective function that minimizes the total cost is developed. Hydraulic, technical and economic constraints are considered. The model is linearized based on a piecewise method and solved by the branch-and-bound algorithm. This method is applied to a real case study of a pipeline system in an oilfield.

油田开发中后期的一个重要问题是保持稳定的产量，特别是当现有的集输管道系统不能完全满足低压和低生产率的发展时。在这些情况下，有必要重组原始的收集管道系统。在这项研究中，提出了一种优化设计方法，以在开发的中后期对油田的管道系统进行重组。基于稳定生产的需求和管道系统的现有结构，开发了一种具有最小化总成本的目标函数的混合整数非线性规划（MINLP）模型。考虑了液压，技术和经济方面的限制。该模型基于分段方法进行线性化，并通过分支定界算法进行求解。