TELESCOPIC CORE SAMPLING SYSTEM Russian patent published in 2021 - IPC E21B25/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular to devices for drilling with core sampling. The telescopic core sampling system includes a shoe assembly consisting of the lower half of the shoe, the upper telescopic half of the shoe and the core breaker, at least one telescopic sleeve connected to the upper half of the shoe by means of cut-off pins, a core receiving pipe. The telescopic sleeve is made in the form of a truncated cone, installed in the upper telescopic half of the shoe with a smaller diameter downwards. The core receiving pipe in the upper part is connected to a device for cutting a telescopic sleeve, made in the form of an adapter with threads at its ends, having at least one cutting element in the form of a pointed metal plate with a radial arrangement inside the cutting device. The through diameter of at least one cutting element is larger than the diameter of the core being taken and smaller than the inner diameter of the smallest telescopic sleeve, and in the upper part of the device on the inner surface there is a thrust ledge for interaction with the cut parts of the telescopic sleeve.

EFFECT: increased core yield.

4 cl, 4 dwg