CORE EXTRACTING DEVICE Russian patent published in 2009 - IPC E21B25/00 

FIELD: mining.

SUBSTANCE: invention refers to boring tools, and namely to boring means with core extraction. Core extracting device consists of an upper adapter, a lower adapter, a housing consisting of separate modules and centralisers connected to each other by means of threaded connections, and a core-receiving tube containing the rotation support and adjustable suspension in the upper part, and the device for separating core from the bottom of the well - in the lower part. That device includes collet and/or levered core extractors. Upper adapter is assembled and consists of the adapter housing and nipple, which are connected to each other with a threaded connection; at that, the adapter housing is connected to the housing part of the device in the lower part, and to the nipple - in the upper part; at that, the nipple is connected to the core receiver in the lower part, and to the drilling string - in the upper part.

EFFECT: improving operating reliability of the device in severe boring conditions owing to high emergency reliability indices.

2 cl, 1 dwg