丛式井平台设计及井丛分组优化

Optimization of well pad design and drilling-well clustering

改进并测试了包含30多个钻井工程参数的技术-经济模型,通过新开发的计算机程序列出平台上的井丛分组方式并计算其技术经济效益。针对含24口初始产油量不同的井的平台,研究分析了7种钻井方案,得出了3种折现率和5种产油量递减率条件下净现值(NPV)最优的分组方式。研究表明,针对井丛井数不等的井平台,可能只需对现有设计进行轻微调整(改变几个井丛的布局)就能得到最大净现值;相对净现值增幅与净现值的绝对值成反比;相比常规项目中具有相等井数的井丛,采用井丛井数不等的分组方式可以使NPV增幅达到1%,页岩地层开发项目NPV增幅可达2%或更多,边际油田项目增幅高达45%。

A model accounting for more than 30 parameters of drilling projects,and a computer program to enumerate groupings of the wells of a pad with consequent calculations of technical-economic characteristics,are developed and tested.Seven drilling scenarios for a 24-well pad with different starting oil flow rates for the wells are studied.Optimal well groupings in terms of Net Present Value(NPV)for three discount rates and five oil production decline rates have been found.The results show that:NPV-maximizing well pad designs with unequal(varying)numbers of wells in groups(clusters)may require only slight alterations of existing designs(changing the configurations of a couple of well clusters);relative NPV gain is inversely proportional to the absolute value of NPV;observed increases in NPV in groupings with varying numbers of wells reach up to 1%with respect to groupings with equal(constant)numbers of wells in groups for conventional projects,and could reach 2%and more for shale formation development projects,and up to 45%for marginal projects.