脉冲中子水流测井技术及其应用

Water flow log technology by pulsed neutron and its application

油田开发进入中、后期时,搞好注入井的测试调剖和加大注入井的管理在开发调整中的作用越来越重要。脉冲中子水流测井是一种测量水流速度的测井技术,其利用脉冲中子与氧元素相互作用后能放射出特征伽马射线,通过检测伽马射线来确定仪器周围含氧流体的流动情况。该技术可以穿透油管和套管进行测试,且不受流体流动方向、管内或管外流动的限制;还可实现对配注井内的管柱工具是否堵死、泄漏以及管外窜流的检测。

Enhancing the testing profile control and management in the injection well is becoming more and more important in development adjustment when oilfield entered middle and later development period. Water flow log by pulsed neutron is a kind of logging technology for measuring the velocity of water flow. Characteristic gamma ray may be radiated after the interaction of pulsed neutron and oxygen element. The flow of oxygenated fluid around the equipment may be determined by gamma ray detection. The technology can be used to test by penetrating oil tube and casing with no restriction on the flow direction and tube flow or flow across tube. It can also realize detecting whether sealing, leakage of string tool in the injection allocation well and channeling across tube.