DRILL TOOL CENTRALISER Russian patent published in 2014 - IPC E21B17/10 E21B17/07 

FIELD: mining.

SUBSTANCE: proposed centraliser comprises case with axial channel and radial bores, centraliser sleeve concentrically fitted thereat to turn thereabout and furnished with lengthwise ribs at outer surface and damping cartridge at inner surface and axial and thrust bearings. Note here that damping gasket has radial gates made at the level of the case radial bores and set of circular through channels. Note also that said inner spaces of said through channels are communicated via gates at case radial bores with the case axial channels and composed by circular segments different in different directions to ends of centraliser sleeve. Thrust bearings are fitted in axial channels of damping shell with the store of axial travel and composed of flexible hollow inserts, their side surfaces being made with large angles of seizure to seal lengthwise through channels at end sections.

EFFECT: higher operating efficiency.

3 dwg