A core holder

Abstract

The invention discloses a core holder. The core holder comprises a cylinder, a sample tube, a fixed plug, an adjustable plug, a heat insulation sleeve and a top sealing cover, wherein the cylinder is made of engineering plastic; a confining pressure cavity for accommodating the sample tube is formed in the cylinder; the heat insulation sleeve is sleeved outside the cylinder; a lower stepped part of the bottom end of the cylinder is provided with threads which are matched with threads of the fixed plug; the bottom end of the cylinder is sealed; an upper stepped part of the top end of the cylinder is provided with threads which are matched with the top sealing cover and the adjustable plug and seal the top of the cylinder; and a channel for displacing fluid circulation and a channel for confining fluid circulation are formed in the fixed plug and the adjustable plug. By the core holder, severe interference of temperature change of the core holder on a nuclear magnetic resonance probe coil can be avoided in a high-temperature high-pressure state.

Description

technical field [0001] The invention relates to the field of petroleum energy engineering, in particular to a rock core holder. Background technique [0002] In the field of petroleum and energy engineering, due to the non-destructive nature of nuclear magnetic resonance detection, the components of the material can be analyzed through the relaxation time map data without destroying the material structure; through the nuclear magnetic resonance imaging system, it is possible to carry out non-destructive and non-invasive imaging analysis of the material ; The NMR system can also be used to perform experiments on conventional parameters (such as permeability, porosity, saturation, etc.) of reservoir cores. Due to its non-destructive, fast, accurate and repeatable characteristics, and the ability to achieve functions that cannot be achieved by other conventional detection and analysis methods, nuclear magnetic resonance has become an internationally recognized detection technol...

AI Technical Summary

Problems solved by technology

Moreover, during the process of using nuclear magnetic resonance, the temperature change of the core holding device used will interfere with the probe coil of nuclear magnetic resonance, and affect the imaging operation of the low-field nuclear magnetic resonance imaging analysis system based on permanent magnets

[0004] In summary, the core holder in the prior art cannot avoid the interference of the temperature change of the core holder under the high pressure state on the NMR probe coil

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