DEVICE FOR DETERMINING CORE PARAMETERS AND CORRESPONDING METHOD Russian patent published in 2021 - IPC G01N24/08 

FIELD: geophysics.

SUBSTANCE: invention is used to determine the parameters of whole cores. The essence of the invention lies in the fact that the device for determining the parameters of whole cores consists of a body, which is a supporting frame; a unit of magnet and coils, a unit for moving the core, an electronics unit attached to the body, while the unit of magnet and coils is made in the form of a permanent magnet according to the Halbach array with a cylindrical gap inside it. A gradient coil is installed in the cylindrical gap of a permanent magnet, forming inside its body a cylindrical gap, moreover, a radio frequency coil is installed in the cylindrical gap of the gradient coil, forming a cylindrical gap inside its housing for the passage of a whole core through it, the electronics unit is configured to control the core movement unit so as to ensure the movement of the core through the magnet unit and the coils at a given speed, and control the block of magnet and coils so as to form an NMR signal with the given parameters using the transceiver coil and the gradient coil, to receive and process the response of the core to this effect, to determine the core parameters based on the response. The gradient coil consists of two mirror-symmetrical parts, each of which is a series connection of two semicircular and four straight sections of conductors, and the semicircular sections of the conductors of each part have a radius r. They are displaced relative to each other by a distance of 2*H and are in parallel planes, the ends of the semicircular sections are connected to each other by means of four straight sections of conductors passing through a point located in the middle between the semicircular sections and remote from the axis connecting the centers of the semicircular sections, at a distance R, and the parts of the gradient coil are connected towards each other, the ratio R/r is essentially 12:7, and the H/R ratio is essentially 15:12.

EFFECT: invention is aimed at providing ability to quickly determine the NMR properties of whole core samples directly in the well without preliminary preparation for research.

6 cl, 4 dwg