METHOD FOR DETERMINATION OF TIGHTNESS OF COLUMN AND SHANKS Russian patent published in 2020 - IPC E21B47/11 

FIELD: mining.

SUBSTANCE: invention relates to production of liquid and gaseous minerals, mainly hydrocarbons, namely to inspection of assemblies and elements tightness. Invention will make it possible to take timely measures to eliminate leakages and make production more efficient. At construction of wells in the casing or shank in places which will be subsequently tested for tightness, containers are placed, which are able to extract marking substances in the passing fluid, after casing or shank in the well space between the rock and casing pipes are cemented, wherein the containers with marker substances are located inside the cement stone, the well fluid at the well outlet is checked for marker substances and the tightness of the downhole equipment is determined by the absence of marking substances in the fluid.

EFFECT: technical result achieved during implementation of the developed method consists in obtaining complete and reliable information on tightness of casing, production strings, shanks and well assemblies even during operation.

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