Patent ID: 8092147
Filing Date: 2012-01-10
Classification: E21B,F03B,Y10S

Abstract:
1. A turbine for generating power in a drill string, with a turbine rotor drivable by a fluid, a bypass device having a first bypass channel bypassing the turbine rotor, a valve for varying the volumetric flow through the bypass channel, and a control device which is driven by the fluid and has a drive element via which the valve is movable anywhere between a first and a second position, wherein said drive element produces a flow resistance in the fluid flow path downstream from the turbine rotor and downstream from the valve and in the flow direction takes support upon a spring, the turbine further comprising a cylindrical housing having a first housing section of larger diameter and a second housing section of smaller diameter, said housing sections being separated from each other by a housing shoulder, wherein the housing section of larger diameter has on its outer side guide ribs which are arranged at a circumferential distance from each other and form a guide for the housing in the drill string.