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脉冲中子氧活化水流测井是一种测量水流速度的测井技术,该仪器利用脉冲中子与流体中氧元素作用后放射出伽玛射线的特征,通过探测放射出的伽玛射线来确定流体的流动情况。测得的水流时间谱中,在油管和套管中的同向流体速度差别不是很大时,将出现两个相互重叠的峰。渡越时间、流体速度和流量等的计算基于该重叠峰中的一个完整峰位,重叠峰的解谱分离效果对渡越时间等的求取非常重要。本文对两个相互重叠的双水流峰的分离问题进行了研究,提出了一种利用峰的属性法来分离脉冲中子氧活化测井水流时间谱重叠峰的方法。实例显示,该法分离的精度高、效果好,是一种有效的分离氧活化测井水流时间谱重叠峰的方法。
Pulsed neutron activated water flow logging is a well logging technique that measures the velocity of water flow. The instrument uses the characteristics of pulsed neutrons and gamma rays emitted by the oxygen in the fluid and is determined by detecting the emitted gamma rays Fluid flow. In the measured water flow time spectrum, two peaks that overlap each other will appear when the difference in the velocity of the fluid in the same direction in the tubing and casing is not very large. The calculation of the transit time, the fluid speed, the flow rate, and the like is based on one full peak among the superimposed peaks, and it is very important to determine the transit time and the like for the overlapping spectral peak splitting effect. In this paper, we study the separation problem of two overlapping water flow peaks, and propose a method of using peak property method to separate the overlapped peaks of time spectrum of pulse neutron oxygen activated logging. The example shows that the method has the advantages of high precision and good effect, and is an effective method to separate the overlapping peaks of the time spectrum of oxygen activation logging.