METHOD AND DEVICE FOR DETERMINING HEAT CONDUCTIVITY OF CORE SAMPLE Russian patent published in 2024 - IPC G01N25/18 

FIELD: measurement.

SUBSTANCE: invention relates to the field of research of thermophysical properties of rocks, namely – thermal conductivity, coefficient of anisotropy of thermal conductivity and degree of thermal inhomogeneity of rocks, determined on a sample of core extracted from wells during their drilling in rock massifs and which is a cylindrical sample of a solid body having uniaxial anisotropy. Method for determining thermal conductivity of a core sample consists in heating the cylindrical surface of the core sample in a local area moving at a constant speed relative to the core sample in a spiral, along a circle or along the generatrix of the cylindrical surface of the core sample, and recording the temperature of the cylindrical surface of the core sample on two local areas of the surface located along the line of movement of the area of local heating relative to the core sample, one of which is located in front of the area of local heating, and the other is behind the area of local heating. In order to determine the main values of the heat conductivity tensor of the core sample, in which one main axis of the heat conductivity tensor is oriented perpendicular to the layering plane, and the other two axes lie in the layering plane and their main values of the heat conductivity tensor are the same, providing movement relative to the core sample of the area of local heating and areas of registration of temperatures of the surface of the core sample along a spiral, along a circumference or along a generatrix of the cylindrical surface of the core sample, at that, before the beginning of measurements, the directions of the main axes of the heat conductivity tensor of the core sample are determined, then setting the direction of movement of the area of local heating and areas of recording temperatures relative to the axis of the core sample, and after heating of the cylindrical surface of the core sample in the local area and recording the temperature of the cylindrical surface of the core sample on two local areas of the surface, the main values of the heat conductivity tensor of the core sample are determined.

EFFECT: determination of the principal values of the heat conductivity tensor corresponding to the directions along and perpendicular to the lamination plane of the core sample, by optical scanning along the spiral, along the circumference or along the generatrix of the cylindrical surface of the core sample without sawing it, registration of changes in heat conductivity tensor of core sample, fixation of changes in properties of core samples with time, starting from the moment of their drilling, determination of content of organic carbon in samples of Bazhenov formation by established correlations of content of organic carbon with heat conductivity.

5 cl, 5 dwg