鄂尔多斯盆地北部工区测井优选钻头技术与应用

利用已完钻测井资料和地质资料对工区地层强度特性进行评价,建立地层声波时差和岩石可钻性的定量关系,估算各层段的岩石可钻性级值,并对地层岩石可钻性进行分级与对比。根据可钻性级值和地层硬度、抗压强度等岩石力学参数及钻井工程情况,利用钻头优选方法,选择适应研究工区的钻头型号,对不同层位使用的钻头型号进行可行性分析和评价。通过几口井实际钻头选型的试验研究和应用,达到了提高机械钻速及钻头进尺,缩短钻井周期,降低钻井成本的目的。

OPTIMIZING BIT TECHNOLOGY THROUGH WELL LOGGING AND ITS APPLICATION IN THE NORTHERN WORK AREA OF ORDOS BASIN

The formation strength characteristics in the work area are evaluated with the logging data and geological data after drilling to establish the quantitative relation between formation sonic differential time and rock drillability, then to estimate the level value of rock drillability of each interval. The formation drillability is graded and compared. According to the rock mechanics parameters as the grade value of drillability, hardness of formation and compressive strength, etc. and drilling condition, type of the bit is chosen to adapt the research work area using bit optimization method. Feasibility analysis and evaluation are made to the bit types of different horizons. The experimental study and application of the bit type selection in several wells demonstrate that drilling rate and bit footage have been improved. The drilling cycle has been shorten, and the cost of drilling reduced.