NUCLEAR MAGNETIC-RESONANT TOOL WITH EXTERNAL MAGNETS Russian patent published in 2015 - IPC G01V3/32 

FIELD: oil and gas industry.

SUBSTANCE: invention is used to perform logging during drilling using a nuclear magnetic-resonant tool. Essence of the invention consists in the fact that nuclear magnetic-resonant logging is performed during drilling using magnets placed outside a heavyweight drill pipe and magnetically permeable elements for control of a magnetic field gradient. A set of magnets can be located on the heavyweight drill pipe and/or built into it; with that, an antenna is located in an axial direction between them. As a version, the set of magnets and the antenna arranged between them can be located on a sleeve that slides along a groove in the heavyweight drill pipe. Additionally, the permeable element can be located in an axial direction between the set of magnets to change depth of the investigation.

EFFECT: providing a possibility of using an increased volume of magnetic material, as well as providing a possibility of changing a magnetic field configuration.

20 cl, 16 dwg