This paper outlines the operational procedure for cemented back monobore open hole, multi-stage (OHMS) completions. Due to various issues with conventional plug-type cementing stage tools a new hydraulically activated, mechanically closed cementing stage collar was designed to open/close without the use of a plug/dart. The new stage tool addresses the operational issues encountered with conventional tools and further reduces costs by reducing rig time. With the new stage collar, there is no drill out of plugs and cement after the cementing operation, eliminating debris that could be problematic for the OHMS functioning. The development of the new stage collar through lab testing and field trials is discussed. This technology has been successfully used in various formations in Canada and the United States. This paper presents case study examples of installations in the Montney formation.