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脉冲中子中子(PNN)测井技术在不洗井、不关井条件下,可实现过套管或过油管的储层监测,即通过测量地层中热中子数量随时间的变化关系,用特有的处理手段和解释方法,求取含油饱和度等多种地层参数。PNN测井系统由井下仪器部分(包括中子发生器短节、中子探测器短节、自然γ短节和通讯短节)、地面数据采集部分及解释软件包部分组成。胜利油田某高含水油井的应用表明,PNN测井技术有助于分析高含水低矿化度油层水淹情况,指导油井采取挖潜措施,措施后该井日增油4t,水的质量分数下降6.2%。
Pulsed neutron neutron (PNN) logging technology can be used to monitor the formation of casing or oil pipe without well washing or shut-in. By measuring the relationship between the number of thermal neutrons in the formation and time, With unique processing methods and interpretation methods, find the oil saturation and other formation parameters. The PNN well logging system consists of downhole equipment components (including neutron generator short section, neutron detector short section, natural γ short section and communication short section), ground data acquisition part and explanation software package part. The application of a high water cut oil well in Shengli Oilfield shows that PNN logging technology can help to analyze the water flooding of high water and low salinity reservoirs and guide the oil well to take potential measures. After the measures, the oil well increases 4t and the water mass fraction drops 6.2 %.