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俄罗斯СГДТ测井仪能用13 7Cs伽马源和多个周向排列的长源距探测器测量套管偏心率。仪器原为在 14 6mm或者168mm外径的套管中应用而设计。国内油田多数油水井套管外径为 14 0mm ,因而有必要重新研究仪器响应特性。通过公式推导和蒙特卡罗数值模拟 ,针对该仪器提出了解释套管偏心率的新模型。与原模型相比 ,新模型的预测精度有较大提高
The Russian СГДТ tool can measure casing eccentricity using a 13 7Cs gamma source and a number of circumferentially spaced long source detectors. The instrument was originally designed for use in 14 6 mm or 168 mm OD sleeves. Most oil wells in the domestic oilfield casing diameter of 14 0mm, so it is necessary to re-study the instrument response characteristics. Through formula derivation and Monte Carlo numerical simulation, a new model of casing eccentricity was proposed for this instrument. Compared with the original model, the prediction accuracy of the new model is greatly improved