地质导向系统的研究与应用

地质导向系统是90年代中期开发出来的定向钻井新技术,是对石油钻井工业的一次技术革新。在海洋石油的定向井、延伸井和水平井钻井工程中,该系统有着广泛的应用前景,尤其在地质环境复杂、精度要求较高、工程条件较为恶劣无法进行电测等情况下,更显出其优越性。1997年南海东部陆丰22-1油田开发水平井应用了该系统,收到了良好的效果。在断层发育带和地层岩性不纯等极其复杂的地质环境下,成功地进行“软着陆”并钻成长度超过2000 m 的水平井。文中介绍这一新技术在陆丰22-1油田开发井的应用情况,着重分析其应用结果,研究其在南海东部地区的发展。

Study and Application of Geo-Steering Drilling System

Geo-steering (GST)drilling is a new technology for evaluating the formation collegially while drilling. It was published in early 1990's, and has been applied in drilling engineering since the middle of 1990's. Its main surveying system is consisted of a GST sub, LWD (Logging While Drilling ),and MWD (Measuring While Drilling ). The GST sub is just a few meters above the drilling bit. The main characteristic of formation, such as lithology.physies and chemicals,can be measured after very short footage of new hole been drilled. Based on the analysis of the geological and reservoir data of the offset wells, it can be predicted what formation to be drilled. Soft-landing is a profile design to set the landing point (enter horizontal interval )into the proposal position and for the geological target. The well profile can be designed and modified according to the data from offset wells and GST surveys before and while drilling.Lufeng 22-1 Oil Field is a large-scale field with quite thin bed. There are many structural faults through the reservoir. The pay zone is mainly sandstone but interlining with other lithobogy. The GST and Soft-landing technology was applied in the field to drill five(5) horizontal wells. It indicated that the technology was helpful and valuable for drlling through the faults and modifying the profile to land the horizontal section in the perfect geological target effectively. This treatise discusses how to use the technology for Soft-landing and drilling ahead the horizontal interval in ideal pay zone.