泌阳凹陷小断块薄层水平井地质导向探讨

Discussion on horizontal well geo-steering of thin layers in small fault block of Biyang sag

泌阳凹陷水平井一般布署在零碎区块,由于目的层厚度薄、地层相变严重,实钻结果与设计存在着一定的差异,为此特别需要强化水平井的地质导向工作。依据近二年泌阳凹陷水平井钻探实践经验,提出了收集消化相关资料、确定对比控制层、分析设计靶心合理性、绘制预测轨迹剖面等作为钻前应做好的基础工作,提出了建立准确的地质剖面和精细地层对比,以及水平段导向方面是在钻进阶段要做好的重点工作。

Horizontal wells in Biyang sag are generally deployed in spare blocks,with characteristics of thin target layer thickness,serious formation phase change and some differences between real drilling results and the design,therefore,the horizontal wells geo-steering should be specially strengthened.According to horizontal wells practical experience of Biyang sag in the last two years,the basic work before drilling and the conventional technology should be prepared,such as data collection and digestion,determination of controlled layers,analysis of target rationality,and drawing of predicting trajectory profile.Besides that,how to establish accurate geological profile and fine stratigraphic correlation,and how to make a good geo-steering in drilling stage,for example in horizontal section have also been discussed.