ORIENTED CORE EXTRACTION DEVICE Russian patent published in 2012 - IPC E21B25/16 

FIELD: oil and gas industry.

SUBSTANCE: device includes outer housing, drilling bit, core tube, core grabber and flushing system. Core receiving tube is equipped with metal weight and connected to adjusting head by means of upper and lower radial thrust bearing assemblies rigidly fixed along central (1) axis. Lower part of core receiving tube is equipped with cutters-core markers, and its upper part is provided with checkout device with graduation marks applied to it, where central zero mark is located in one vertical plane with the main cutter-core marker and metal weight.

EFFECT: enlarging manufacturing capabilities and increasing core recovery.

2 cl, 1 dwg