DOWNHOLE TURBINE ASSEMBLY Russian patent published in 2018 - IPC E21B4/02 

FIELD: drilling of soil or rock.

SUBSTANCE: group of inventions relates to drilling. Downhole turbine assembly comprises: a stator housing having one or more stator blades located inside the stator housing and directed radially inwardly from it, a rotor shaft rotatably mounted within the stator housing and having a first section having a first diameter and a second section having a second diameter larger than the first diameter, the first section comprising an upper first portion disposed at the first end of the rotor shaft and terminating on the upper bearing arm and a lower first portion disposed at the second end of the rotor shaft and terminating on the lower bearing arm, one or more rotor blades fixed to the second rotary shaft with the rotor shaft and alternating with one or more stator blades, and a first bearing assembly disposed at the first end, and a second bearing assembly located at the second end. First and second bearing assemblies each comprise a bearing housing, one or more radial bearings, and one or more thrust bearings. At least one of the bearing housings includes a primary flow channel and a secondary flow channel, wherein one or more radial bearings and one or more thrust bearings are disposed in the secondary flow passage.

EFFECT: provides a reduction in the gap between the bearings and the polarity of the rotors, simplification in their management.

21 cl, 2 dwg