SECTIONAL CORE RECEIVER WITH A DETACHABLE TIGHT DOVETAIL JOINT INCLUDED IN A CORING TOOL Russian patent published in 2023 - IPC E21B25/00 

FIELD: mining.

SUBSTANCE: invention relates to mining, namely, to apparatus for obtaining and extracting core. Sectional core receiver with a detachable tight dovetail joint included in a coring tool is filled with an insulating fluid and comprises a suspension unit in the upper part, a core separation unit in the lower part, pipe sections interconnected by detachable mechanical joints, each of the sections equipped with a tool for locking the joint in the closed state and elements for sealing against the ingress of drilling mud into the pipe sections. All said detachable mechanical joints of the above units and pipe sections are made as a detachable tight dovetail joint. Cylindrical grooves are made at the points of joints to the length of the connected parts, wherein the joint-locking sleeve slides freely along said grooves. Elastic sealing elements are secured on the groove on both sides of the joint, whereon the sleeve covering the connected parts at the joint site in the closed state moves. The length of the grooves is at least 1.6 of the height of the sleeve, and the depth of the grooves is selected such that the outer diameter of the sleeves does not protrude beyond the dimensions of the pipe sections of the core receiver, considering the thickness of the sealing element and the allowance for strain thereof.

EFFECT: structural simplification and higher security of joints of the core receiver.

3 cl, 5 dwg