论文部分内容阅读
我国放射性同位素示踪注水剖面测井的年测井作业量超过１万井次，但因存在放射性示踪剂“沾污”等问题，使其测井资料中出现了相当多的假异常；现有的“沾污校正”法又因沾污类型需靠经验估计，导致相当大的不确定性。新的能谱示踪注水剖面测井法基本创新点是：（１）任一井段的放射性同位素示踪注水剖面测井曲线异常面积增量是由井筒各径向界面上的示踪剂对它分别贡献的“径向界面异常面积”之和所构成，引入“径向界面贡献率”来描述相应的贡献份额；（２）提出其物理基础——过油管伽马能谱探头测得的伽马能谱谱形会随示踪剂在井筒中的径向位置不同而发生明显变化；（３）导出了几种可以定量判断示踪剂在井筒中的径向位置和得到径向界面贡献率的谱分析方法。模型井实验结果证实此新方法可以为沾污的识别和校正提供客观的定量依据。此方法完全覆盖了现行放射性同位素示踪注水剖面测井法，不要求改变其示踪剂和施工工艺，有利于生产推广；但需要使用过油管伽马能谱测井仪及相应的地面仪器软硬件。它可能为大量存在的示踪剂沾污等问题提供一种解决办法。
China’s radioactive isotope tracer waterlogging logging annual logging volume of more than 10,000 times, but because of the presence of radioactive tracer “contamination” and other issues, so that it logs a considerable number of false anomalies appear; now Some “stain correction” method because of the type of contamination needs empirical estimates, resulting in considerable uncertainty. The basic innovations of the new energy spectrum logging water injection profile logging method are: (1) Radioisotope tracer in either well section The abnormal area increment of the water logging profile is determined by the tracer pairs Its contribution to the “radial interface anomaly area” and the introduction of “radial interface contribution rate” to describe the contribution of the corresponding contribution; (2) to put forward its physical basis - through the tube gamma spectrometer probe measured Gamma spectroscopy will change significantly with the radial position of the tracer in the wellbore. (3) Several methods to determine the radial position of the tracer in the wellbore and obtain the radial interface contribution Rate spectrum analysis method. The experimental results of model wells confirm that this new method can provide an objective and quantitative basis for the identification and correction of contamination. This method completely covers the current radioisotope tracer water injection profile logging method, does not require changing its tracer and construction technology, is conducive to the promotion of production; but need to use the tube gamma spectroscopy tool and the corresponding ground soft instrument hardware. It may provide a solution to the large number of tracer contamination problems that exist.