Downhole power generation system

摘要

An apparatus for generating electrical power downhole comprises a housing located in a drillstring. A primary flow channel is formed through the housing. At least two secondary flow channels are located in the housing and arc laterally displaced from the primary flow channel, A fluid driven electrical generator is positioned in each of the at least two secondary flow channels. A controllable flow diverter is associated with each of the secondary flow channels to controllably divert at least a portion of a fluid flow m the primary flow channel to at least one of the at least two secondary flow channels to drive the generator therein.