DEVICE FOR PERFORMING GEOPHYSICAL INVESTIGATIONS (VERSIONS) Russian patent published in 2017 - IPC E21B47/01 

FIELD: mining.

SUBSTANCE: according to the first version, the device includes an assembly of downhole tools equipped with transit line of electronic communication installed in the drill string or tubing pipes, and includes a casing installed coaxially for protection and transportation of the tool assembly and a guide tube with a movement limiter located in the lower part and holes above it, a control chamber in the form of a cavity formed between the casing and the guide tube, the tool assembly is configured in the upper part with an arm and shank, and rigidly fixed in the lower end with the drill pipe, a coupling-decoupling device with a collet grip mounted in the upper part in the casing by a coupling with holes rigidly fixed to the drill pipe, a cone bushing mounted in the guide tube for engagement with the collet grip. According to the second version, the device includes a casing installed coaxially for protection and for moving along the string, a guide pipe with channels inside for flushing fluid passage to the drilling tool and channels for controlling the movement of the casing, the tool assembly fixed in the upper part to the guide pipe, and in the lower part attached by means of the coupling to the drill pipe. The coupling is provided with spring-loaded balls for fixing the protective casing when running in, and channels for passing flushing fluid when drilling. The inner surface of the casing has circular projections forming the upper and lower arms. The area of the lower arm is greater than the area of the upper arm.

EFFECT: it is possible to investigate the drilling tool, reduced time for performing the investigation, reduced risk of accident, improved information content.

2 cl, 2 dwg