模拟射孔技术在三次加密调整方案中的应用

Application of Simulated Perforation Method on Tertiary In- filling Adjustment Plan

大庆油田属陆相油田,油层多、非均质性严重,特别是进入高含水后期,油层水淹严重,剩余油平面和纵向上分布零散复杂,目前尚没有一种准确寻找剩余油的有效方法,各公司研制的预测剩余油软件均无法对空白井区进行预测,准确率比较低,只有75％左右,不能适应三次加密调整的需要。通过研制的一种模拟射孔技术,利用虚拟布井模拟射孔选层全过程,对井间空白区域进行剩余油判断,然后逐井逐层预测,最后叠加出虚拟井点的厚度,对厚度达标地区钻三次加密新井。经钻井验证,该技术预测厚度准确率达90.0％,比目前应用的其他方法准确率提高15个百分点左右,减少干井及低效井15％,有效地提高了三次加密井钻井的成功率,取得了巨大的经济效益。

Daqing oilfield is a continental oilfield. There is a serious heterogeneity in its multi-layered reservoirs. Sinee the entry of the later stage of high water eut, there occurred serious water out,making the remaining oil scattering horizontally. There is not an effective way in search of remaining oil. Those present software aim to predict remaining oil cant predict remaining oil in blank area,with a low accuracy of 75%. This paper discusses about a newly developed method of simulated perforation. By using simulated well location and candidate layer, this method approves remaining oil in inter-well areas, layer by layer and well by well. After summing up the thickness,a final thickness is calculated. Then tertiary infilled wells with efficient thickness are drilled. Drilling experience suggests that this method provides an thickness prediction accuracy of 90. 0% . It is 15 percentage higher than accuracy provided by other methods, and it decreases 15% of the dry wells and low effect wells. It effectively improves the success rate of tertiary infilled wells with a considerable economic success.