DRILLING JAR Russian patent published in 2019 - IPC E21B31/113 E21B17/02 E21B17/07 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to deployment of a downhole tool at a certain depth of a wellbore using a tubular string. Drilling jar unit for hydraulic communication between first and second hydraulic lines comprises: coupling assembly comprising connecting coupling passage passage configured to be hydraulically connected to first hydraulic line; a rod assembly telescopically movable inside the coupling assembly and comprising a rod feed passage configured to be hydraulically connected to the second hydraulic line; an annular cavity between the stock assembly and the coupling assembly, which is in fluid communication with the coupling assembly and the stock assembly such that the passage channels of the coupling and the stem have a hydraulic communication through the annular cavity. Rod assembly further comprises two dividers and a body connected between two separators. Annular cavity is further defined as the surrounding body between the separators.

EFFECT: technical result is provision of hydraulic control line communication through drilling jar.

17 cl, 10 dwg