Drilling cost optimization in a hydrocarbon field by combination of comparative and mathematical methods

In drilling operation, a large saving in time and money would be achieved by reducing the drilling time, since some of the costs are time-dependent. Drilling time could be minimized by raising the penetration rate. In the comparative optimization method, by using the records of the first drilled wells and comparing the criteria like penetration rate, cost per foot and specific energy, the drilling parameters of the next wells being drilled can be optimized in each depth interval. In the mathematical optimization technique, some numerical equations to model the penetration rate, bit wear rate and hydraulics would be used to minimize the drilling cost and time as much as possible and improve the results of the primary comparative optimization. In this research, as a case study the Iranian Khangiran gas field has been evaluated to optimize the drilling costs. A combination of the mentioned optimization techniques resulted in an optimal well which reduced the drilling time and cost considerably in comparison with the wells already drilled.

钻井提速工具经济性预测评价方法

目前常用的提速工具经济性评价方法都是在钻后进行评价,不能为特定井段优选提速工具提供依据,为此,以单位进尺成本为准则,提出了一种钻井提速工具经济性评价新方法。该方法首先结合提速工具性能指标进行钻前预测,然后利用提速工具第一趟钻的实钻参数,对后面几趟钻的经济性进行随钻预测,并根据单位进尺成本预测最后一趟钻应用提速工具的经济性,完钻后计算应用提速工具井段的钻井总费用,并与邻井未应用提速工具相同井段的钻井总费用进行对比,以确定提速工具的经济性。实例验证及研究结果表明,钻井提速工具经济评价新方法可指导特定井段提速工具的优选和快速及时地预测提速工具的经济性。