PND-S测井技术在特高含水油田的应用

Application of Pulsed Neutron Decay-spectrum Logging (PND-S) in Higher Watercut Oilfield

胜坨油田进入特高含水期后,不断挖掘层问剩余油潜力是保持油田稳产的重要手段。PND-S测井是在中子寿命测井和碳氧比能谱(C/O)测井的基础上发展起来的一种储层剩余油饱和度监测方法,一次下井可同时测量俘获衰减伽马射线和非弹性散射伽马射线。根据不同地质情况,可选择采用短脉冲发射或长脉冲发射。探测器采用双探头结构,获取剩余油饱和度信息更加准确可靠。利用脉冲中子衰减一能谱(PND-S)测井,可在套管井中,定量获取储层剩余油饱和度,为评价油藏开发状况提供依据;识别和评价气层;评价油层水淹及动用程度;寻找高含油饱和度层,指导制定补孔措施及井组注采调整。

It's an important mean to keep or remain stable oil production by continuously re-recovering the potential remaining oil in cross-layers while the Shengtuo Oilfield enters the higher watercut stage. PND-S logging is a remaining oil saturation monitoring approach developed on the basis of neutron lifetime logging and C/O logging , which is able to measure capture attenuation gamma-ray and non-elastic gamma-ray at one logging. According to different geologic environments, this approach may selectively use short pulze or long pulze transmitting mode . Near detector and far detector are used to obtain more reliable and accurate remaining oil saturation data. PND-S logging is used to measure the residual oil saturation in the casedhole quantitatively for reservoir evaluation and development; identify the gas-bearing ; determine water-flooded reservoir and its producing reserves; and also, find out bed with higher oil saturation for reperforating operation and injection-production well re-arrangements.