Patent ID: 6640910
Filing Date: 2003-11-04
Classification: E21B

Abstract:
A roller vane motor for driving a drill bit, said motor having a single jacket with a lower end and an upper end and being embodied such that all drilling fluid passes inside said jacket to the drill bit, the jacket being provided with outwardly projecting curved members forming recesses therebetween for the passage of return drilling fluid, the curved members creating a circular surface having a diameter approximately equal to that of the drill bit, wherein the curved members as well as the recesses therebetween each extend in longitudinal direction of the jacket of the motor, and in that the motor has wing deflector cams forming part of the jacket, each longitudinal recess being provided at the outer surface of the jacket opposite a wing deflector cam, and wherein the jacket above and below the wing deflector cams has an internal diameter approximately equal to that of the wing deflector cams.