A Rotating Continuous Circulation Tool RCCT for Increasing Drilling Efficiency and Optimizing Borehole Cleaning

Abstract

This paper presents the design, deployment and field trial test of a uniquely designed Rotating Continuous Circulation Tool (RCCT). The RCCT provides nearly continuous rotation of the pipe string and continuous circulation of fluid while making up or breaking out a new stand. Nearly continuous rotation decreases the period of static contact between the formations surrounding the pipe string and the pipe string, thus reducing the risk of the pipe becoming stuck inside the wellbore and also the wellbore collapsing. Continuous circulation results in efficient borehole cleaning. Therefore, the RCCT increases drilling efficiency and optimizes borehole cleaning. Proof-of-concept testing of the RCCT was successfully performed inside casing during a cement clean out operation, which also aided to clearly define drilling parameters required for successful operation of the tool while drilling.