Key surface logging technologies in horizontal well geosteering

详细信息    查看全文

• 作者：Yichao Li^a ; ^{liyic@sinopec.com.cn} ; Zhizhan Wang^b ; Liming Qin^b ; Hongze Xu^c
• 关键词：horizontal well ; geosteering ; mud logging ; stratigraphic correlation and prediction ; geological interpretation
• 刊名：Petroleum Exploration and Development
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：39
• 期：5
• 页码：660-666
• 全文大小：446 K

文摘

In the drilling of horizontal wells, the core task of surface logging is to guide geosteering while drilling by using collected data including electrical property, lithology, petrophysics, and oil/gas-bearing properties. Surface logging in the horizontal geosteering drilling have two key technologies: one is stratigraphic correlation and prediction technology before encountering the zone of interest, the other one is geological interpretation and geosteering technology after encountering the zone of interest. Based on a systematic analysis of difficult points in the two aspects, in combination with application examples, this paper deeply analyzes how to accurately drill into horizontal section by in-depth stratigraphic correlation and timely model modification in the case of inaccurate horizon depth design; and how to improve drilling-encounter ratio of oil layer and well bore quality by accurate interpretation and guidance in the case of encountering non-target zone (e.g., borehole deviates from right track, sedimentary facies changes in the target zone, faults or mudstone interlayers are encountered.).