Abstract: This paper explores a possible theoretical basis for the failure of attempts to develop rotary-vibratory drilling units. With the critical needs in geothermal blast hole excavation and oil ...

Abstract: This paper applies the theoretical solution developed in Part 1 of this paper to a rotary-vibratory drilling unit. The theory developed and applied in these papers explains possible causes for ...

Abstract: This paper outlines the theoretical description of the vibratory portion of the rotary-vibratory drilling process. A multiple mechanical element model is used to describe the drill string and ...