套管井阵列声波测井仪器与油气层识别技术

Oil and gas analysis in cased hole by an array sonic logging tool

文章通过现场10口井的实验结果,肯定了在套管井中可以测量到砂岩地层的纵、横波时差。并且在已知的气层进行了裸眼井纵、横波时差和套管井纵、横波的对比,两者吻合得比较好。这样,利用地层的纵、横波时差信息便可以对以往的老井、低产井以及报废井的气层、疑难油层以及可疑油气层进行重新认识,特别是油层附近未射孔的干层和水层。因为,这时测量的声波时差不受泥浆滤液(或者浸入)的影响,对气层的显示更明显。本研究为套管井地层评价提供了一个新的技术手段,为剩余油气识别提供了一种新的方法。

In Zhongyuan oil field,the row data of 10 different boreholes are obtained using a new array sonic logging tool.It is sure that in cased hole,the P-wave slowness and S-wave slowness of sandstone formation can be accurately processed by phase method.It is the same as the open hole.So the new array sonic logging tool can be applied to old oil well,especially for gas evaluation.There is no invading effect.It is a new technique for cased well.