Development of a thermal mechanical drill for sampling ice and rock from great depths

Abstract Obtaining deep ice cores from glaciers and the world's ice caps and rock samples from beneath the ice requires a new approach in coring technology that permits quick access to sampling zones. A combination of mechanical drilling coupled with water as a drilling and hydraulic fluid shows promise in providing quick access to interesting sample areas, as well as the ability to obtain good quality rock or ice core samples. The system consists of a deep well pump to circulate drilling water from within the ice, a triplex pump to provide hydraulic power, heaters, specially designed instrumented hoses, and a down-hole mud motor to drive the drill. The system is described in detail and thermal models of its effect on cores presented.