摘要
配注井注入剖面测井中最常用的方法是放射性同位素示踪和脉冲中子氧活化。对处于开发后期的油田而言 ,传统的同位素示踪方法的测井条件越来越受到限制 ;而中子氧活化方法仪器成本较高 ,测量下限也较高。放射性相关测量方法有望解决上述问题。这种方法是将示踪剂在油管内水嘴上方释放 ,示踪剂将被水流运移 ,一部分会经水嘴流到油套空间最后进入各个吸水层 ;释放示踪剂后 ,把带有 2个伽马射线探测器的仪器迅速下放至测量点 ,待示踪剂流经这 2个探测器时测量伽马计数率随时间变化曲线 ;利用相关算法计算出渡越时间 ;由于传感器的间距是已知的 ,从而可以算出流体流速 ,进而计算出流体流量。论述了这一方法的测井原理及解释方法 ,并对现场试验情况做了详细分析。
At present, radioactive isotope tracing and impulse oxygen activation are the two mostly used methods for injection profile logging in separated-zone water injectors. For an oilfield in the later stage, the ratio of suitable/total wells for logging with conventional isotope tracing method is dropping off. Oxygen activation method has two disadvantages such as high cost of logging tools and high value of lower limit of measuring ranges. Therefore, geologists are longing for a new method which is more feasible and economic. The proposed radioactive correlation method may meet this demand. The logging tool consists of a tracer releaser and two gamma detectors with known spacing. The measurement takes several steps: releasing tracer in tubing at the depth just above a port that directs the flow; lowering the tool to the depth of measuring points; recording gamma-ray time spectra by the two detectors; calculating transit time of the tracer flowing in the annulus by using correlation algorithm; and finally, converting the transit time into flow rate. Feasibility of this method has been verified by field examinations.
出处
《测井技术》
CAS
CSCD
2004年第B02期57-60,共4页
Well Logging Technology
关键词
注入剖面测井
流量
放射性
示踪剂
测井条件
测井技术
injection profile logging
flow rate
measurement
new method
radioactive
tracer
correlation
