CORE BARREL Russian patent published in 2002 - IPC

FIELD: core drilling of wells; applicable in geological prospecting and mining industry. SUBSTANCE: core barrel includes outer barrel, crown bit and anvil with centering band in lower part and movable connected with outer barrel. Core receiver is located between crown bit and anvil. Core receiver is installed in outer barrel movably with possibility of interaction with crown bit and anvil. Made in zone of interaction of core receiver and anvil, on anvil centering band are recesses overlapped by core receiver in its extreme upper position relative to anvil. EFFECT: higher efficiency of core drilling due to improved quality of produced core attained by differential washing of bottom hole. 3 dwg