Study on heat transfer model theory and numerical simulation used in deep rock in-situ temperature-preserved coring

Abstract

Deep rock in-situ temperature-preserved corers are important when evaluating and developing deep resources. The core temperature change law is the basis for realizing thermal insulation coring during coring, and it is explored from the perspective of the theoretical heat transfer model and numerical simulation. The results indicate that at a 150?C deep rock temperature, the theoretical calculation results only have a difference of approximately 4% compared with the minimum value of numerical simulation. With increasing core lifting speed, the core cooling range decreases, the power demand for active thermal insulation decreases. A core lifting speed of 2.5 m/s can meet the lower energy supply requirements and engineering costs at the same time. The research results can provide theoretical and technical support for deep resource mining.