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脉冲中子俘获(PNC)测井用来确定残余油饱和度已有多年。以前的研究发现,在残余油饱和度(ROS)很低的情况下,要对提高原油采收率作出所需要的决定,应用常规的脉冲中子俘获测井方法,其精确度是不够的。为了降低用脉冲中子俘获测井测量残余油饱和度值的误差,发展了特殊的“测井—注入—测井”技术。用蒙特卡罗(Monte Carlo)模拟技术研究了用脉冲中子测井确定残余油饱和度值的误差。其现场试验数据是从文献报告中取得的。采用更切合实际的95%的置信区间,预期的残余油饱和度值的精确度在所有试验中发现至少降低1/2。“测井—注入—测井”的工艺过程尚未模型化,因而产生了附加的误差。
Pulsed neutron capture (PNC) logging has been used to determine residual oil saturation for many years. Previous studies have found that making the required decisions to increase oil recovery with low residual oil saturation (ROS) is not sufficient for conventional pulsed neutron capture logging methods. In order to reduce the error of measuring residual oil saturation values with pulsed neutron capture logging, a special “logging-injection-logging” technique has been developed. A Monte Carlo simulation technique was used to study the error of determining residual oil saturation with pulsed neutron logging. The field test data was obtained from the literature report. With a more realistic 95% confidence interval, the expected accuracy of the residual oil saturation values was found to be reduced by at least ½ in all tests. The process of “logging-injection-logging” has not been modeled yet, resulting in additional errors.