Varco Top Drive Drilling System is more than a concept. It is a proven, practical drilling system that has been setting drilling records and producing profits for operators. Time savings have averaged over 25% on the wells drilled with this system. In addition to reaching TD ahead of schedule, the operators feel that the ability to drill down 90foot stands, produces a cleaner borehole and fewer subsequent sticking problems. By rotating the string from a drilling motor and gear train, mounted on rails and a derrick, the rig is able to function with the measure of speed, efficiency and safety; never before possible with conventional drilling methods.

The Top Drive’s flexibility to simultaneously rotate and hoist pipe at any time, whether drilling or tripping, can provide many previously unavailable options to drilling personnel. Development of this drilling system began several years ago, when after considerable investigation, Varco determined that the key to a successful derrick mounted drilling system would be found in the method of making and breaking connections overhead in the derrick.

At that time, the technology did not exist to reliably handle this operation, but several years later with Varco’s hydraulic pipe handling tools proven successful, a second look was given the problem of breaking connections in the derrick. Initial designs utilized a railway traction motor, mounted in the derrick, rotating the string through a locomotive reduction gear and a hollow shaft, replacing the axel and flanged wheels.