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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。
The formation rock samples and corresponding downhole acoustic logging data of the buried hill structures in the northeastern Sichuan and Jiyang depressions of China were selected and collected. The feasibility of rock drillability, PDC drill bit drillability and acoustic characteristics were tested. By using the method of mathematical statistics, we analyzed the relationship between the compressional wave velocity VP and the shear wave velocity VS, the drillability KdRC of the roller cone bit, the drillability KdPDC of the PDC bit and the VP and VPD The mathematical model for predicting the drillability of carbonate stratum profile by using acoustic logging data is established. The F value of the selected coincidence rate is greater than 0.75 as the test standard, and the acoustic acoustic logging data is used to calculate and forecast the model. The predicted The precision reached 91.7%, meeting and exceeding the expected technical indicators.