Deployment of the Reelwell Drilling Method in a Shale Gas Field in Canada

Abstract

Abstract The Reelwell Drilling Method (RDM) is a multi-purpose system incorporating a unique flow arrangement. It employs conventional drillpipe into which is fitted an inner string to form a concentric drill string. This arrangement allows the return fluid containing drill cuttings from the bottom of the well to be transported back through the inside of the drill string. The technique enables improved hole cleaning and improved downhole pressure control, and has unique features for application to managed pressure and extended reach drilling operations. Development of the RDM started in 2004 and has since then been through several full scale tests. In the fall of 2010 it was deployed in a shale gas well in Canada. The main goal was to demonstrate the system in a live gas well and to gain field experience of the technology. The system was used in both the vertical and horizontal sections of the well. The concentric drill string was used for drilling the whole well in several bit runs, with circulation in both conventional and concentric circulation modes. The well was drilled to 4250 m MD in 8¾" hole size. The operation validated the concept and demonstrated a practical implementation on conventional drilling rigs. The operation is an important step in the evolution of a technology, which has a significant potential to improve operational efficiency and thereby the recovery of petroleum resources.