Drilling with Production Liner reduces AFEs per well, brings to early production in Urmanskoye field onshore Russia

摘要

As an industry segment, drilling with casing and liner is still very much in its infancy. However, a few "early adopters" have been successfully extending the operational envelope and discovering new applications. The fundamental value of drilling with casing lies in improving drilling efficiency by eliminating flat spots in the drilling curve. It also has the capability of extending open hole sections to reach deeper casing points with smaller diameters, thus eliminating contingency intermediate strings. The implications for exploration and production industry are significant. Currently, there are two basic methods of drilling with casing divided as follows: Rotating the casing at surface to transmit torque to the drilling BHA, or having a retrievable BHA latched inside the casing that incorporates a motor that drives a conventional bit and underreamer. Both systems, though operational and technically sound, still have many technical issues to overcome concerning all aspects of well planning to operations on the rig floor. This paper will focus on drilling with liner by rotating the casing without Top Drive. The paper will highlight the significant lessons learned from these experiences. This emerging technology is considered '"game-changing" and is seen as complementing the expandable and underbalanced technologies which promise to revolutionize well construction.