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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。
Based on the experimental results of 10 wells in the field, the article confirms that the time difference between the longitudinal and transverse waves of the sandstone formation can be measured in the cased hole. And in the known gas layer, the longitudinal and transverse wave time difference of open hole and the comparison of longitudinal and transverse wave of cased hole are well matched. In this way, using the longitudinal and transverse wave time difference information of the strata, we can re-understand the gas reservoirs, difficult reservoirs and suspicious reservoirs of old wells, low production wells and abandoned wells, especially the dry and water layers without perforations near the oil layer . Because, at this time measured sonic time difference from the mud filtrate (or immersion), the display of the gas layer is more obvious. This study provides a new technical means for the evaluation of cased-hole formation and provides a new method for residual hydrocarbon identification.