Temperature-baric behavior of the effective thermal conductivity of sandstones

Abstract

Abstract The paper presents the results of measurements of the effective thermal conductivity of three sandstone samples exhibiting different structural ordering in the temperature range 273-523 K and pressures from atmospheric to 400 MPa, as well as (2) a low-parameter model, described as a temperature dependence at a fixed pressure and the pressure dependence at a fixed temperature. It also describes the influence of pressure on the nature of the temperature dependence. The samples from the following deposits were studied: (1) Kochubei, the Republic of Dagestan, (2) Buinaksk, the Republic of Dagestan, and (3) the Tyumen superdeep well. It was shown that the cumulative increase in temperature and pressure for sandstones with different structural ordering (even when the absolute values of the effective thermal conductivity at atmospheric pressure and room temperature are close) can have a qualitative difference and with a predominantly amorphous ordering, it must be taken into account when compiling temperature models in the terrestrial bark.