Patent ID: 9175515
Filing Date: 2015-11-03
Classification: E21B,Y10T

Abstract:
1. A system for drilling, comprising: a drive shaft for transmitting a torque to a downhole tool, the drive shaft having a hollow central passage formed by a tubular wall extending along a longitudinal axis L thereof, the hollow central passage allowing a flow of a drilling fluid through a bearing section of the system; and an elongated flow diverter disposed in the tubular wall of the drive shaft, the elongated flow diverter having a body comprising a plurality of axially-spaced apertures distributed along the longitudinal axis L of the drive shaft and the hollow central passage, the distribution of the plurality of apertures along the longitudinal axis L reducing the impingement of the drilling fluid while diverting the flow of the drilling fluid from an upstream annulus section of the system to the hollow central passage.