【摘要】 选取并收集我国川东北地区和济阳坳陷古潜山构造的地层岩样及相对应的井下声波测井资料,测试了岩石的牙轮钻头可钻性、PDC钻头可钻性和声学特性,应用数理统计方法研究分析了岩石地面纵波速度VP、横波速度VS分别与牙轮钻头可钻性KdRC,PDC钻头可钻性KdPDC及同块地层岩样地面纵波速度VP与井下测井纵波速度VPD的相关关系,建立了利用声波测井资料预测碳酸盐岩地层剖面可钻性的数学模型,选定符合率F值大于0.75为检验标准,经用现场声波测井资料代入预测模型进行计算,预测精度达91.7%,达到并超过了研究预期的技术指标。更多还原

【Abstract】 Based on formation rock samples selected and collected from Northeast Sichuan area and buried-hill structure in Jiyang Depression and corresponding downhole acoustic logging data of the samples,the rock drillability and acoustic characteristics of the roller cone bit and the PDC bit are tested. Correlation of the compressive wave velocity and shear wave velocity of rock surface with drillability of roller cone bit and drillability of PDC bit respectively,and correlation between the compressive wave velocity of rock surface and the downhole-logged compressive wave velocity of the same formation rock samples are studied by means of mathematical statistics. A mathematical model is established for predicting drillability of carbonate formation profile by using acoustic logging data with coincidence rate F>0.75. By substituting in-site acoustic logging data into the prediction model for calculations,the prediction accuracy is up to 91.7%,reaching and exceeding the expected technical target.更多还原