螺旋井眼的预防及测井数据校正

Elimination of Spiral Borehole and Correction ofLWD Corkscrew

螺旋井眼在钻井作业中普遍存在并产生诸多负面影响.论文应用钻具受压屈曲理论模型,通过综合井下动力学模拟分析系统,分析螺旋井眼形成的主要原因.针对某深海探井钻井案例,对比不同钻具组合、 钻头选型和钻井参数下的钻具屈曲变形和螺旋井眼发生机率,优化钻具组合设计及调整作业参数,预防其 螺旋井眼产生的机率.当螺旋井眼已产生并且影响随钻测井数据质量时,可通过螺旋校正方法改善测井数 据曲线质量、降低螺旋井眼带来的负面影响.

Presence of spiral borehole has many negative effects in the drilling operation. In this paper, integrated dynamic engineering analysis combined with a compressive buckling model for drill string was used to identify the root cause of generating spiral borehole. A deep water explored well is taken as the case study, and detailed analysis was carried out to compare different BHA combination, drill bit selection and vatying drilling parameters in how likely these would cause spiral borehole by evaluating the severity of drill string buckling and BHA deformation. This paper introduced a corkscrew processing method to remove the periodic noise on the data when spiral borehole affects the quality of logging data.