As part of a major oil company's objective to save rig time as well as reduce open-hole exposure time in the Valhall overburden, steerable ream while drilling technology was utilized in their deviated and horizontal wells to eliminate under-reaming thus reducing drilling costs. The well paths require good directional control with holding capability while drilling long tangent sections. Since a single assembly is designed, the rotary steerable assembly must be capable of programmable dog leg generation when changing inclination and direction or geosteering in the horizontal section. This paper describes the application of steerable ream while drilling indifferent hole sections on several wells. Case studies will be presented from wells drilled from the Valhall platform by a jack up rig cantilevered over the wellhead platform. The authors will outline the reasons for utilizing SRWD's and the operational achievements of the system while drilling well F-8, particularly in the two largest hole sections where the tool saved 10-12 days of rig time. The problems observed while drilling directional and horizontal well paths with steerable motor assemblies will be presented in addition to the modifications implemented as solutions. These improvements should make it possible to further improve ROP and steering abilities on future wells. Additionally, the authors will discuss the improvements achieved by applying new cutter technology and design changes for stabilization of the pilot bit. Introduction The landing permit for the Valhall field, located in the southern end of Norway's North Sea sector, was awarded in 1977. Valhall is located in 70meters (m) of water with platforms for drilling, production and quarters. The first production well was drilled in 1982. Horizontal wells have been drilled from the Valhall platform since 1991. In 1996, a wellhead platform was installed to increase the oil recovery rate. A mobile drilling unit, the jack-up Mærsk Guardian was cantilevered over the wellhead platform. Wells are drilled from both the Valhall platform and the wellhead platform at present.