СГДТ套管偏心率解释新模型

An Innovated Model for СГДТ Casing Eccentricity Interpretation.

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 。

With a 137 Cs gamma ray source and six long spaced NaI detectors, the СГДТ HB tool can measure casing eccentricity. The tool has originally been designed to suit 146 mm or 168 mm outer diameter casings. As most oil and water wells in China are cased with 140 mm outer diameter casings,it is necessary to recalibrate the tool. Through theoretical deduction and Monte Carlo simulation, an innovated eccentricity interpretation model is proposed. Compared with the original model, the innovated one has better indicating precision.