| 摘要 |
A device for drilling a well bore is disclosed. The invention includes having a tubular string with a motor means for generating a rotative force. The device further includes an inner drilling device adapted to the motor means and an outer drilling device concentrically arranged about the inner drilling device. The device still further includes a planetary gear system adapted for imparting the rotation generated from the motor means to the outer drilling device. In one embodiment, the motor member has a shaft extending therefrom, with the shaft being operatively connected with the inner drilling device, and wherein the shaft has a plurality of shaft splines thereon formed to cooperate with the planetary gear system. A method of drilling a well bore with the novel drilling device is also disclosed. The method includes rotating a power shaft from the drilling motor in a first direction which in turn imparts rotation to the inner drilling device and a counter rotation to the outer drilling device via the planetary gear systems. |
