Stratum core holder

Abstract

The invention provides a stratum core holder. The stratum core holder comprises a holder cylinder, a rubber sleeve, a rubber sleeve end plug, cylinder covers and a sealing assembly, wherein the holder cylinder is of a hollow structure, and a core sample in arranged at the center position of the holder cylinder; the rubber sleeve end plug comprises an outer end plug body and inner end plug bodies; the rubber sleeve and the inner end plug bodies are arranged in the holder cylinder, and the periphery of the core sample is sleeved with the rubber sleeve; the inner end plug bodies are embedded to the two ends of the rubber sleeve and make direct contact with the core, and the inner end plug bodies and the rubber sleeve are matched to seal and wrap the core sample; in addition, the two ends of each inner end plug body are connected with metal pipe lines, and the other end of each metal pipe line is connected with a cylinder end cap and extends out of the holder cylinder; the metal pipe lines are fixed through sealing pressing caps. The stratum core holder can meet the experiment requirements of exerting static pressure on cores with different diameters, and is convenient to mount and dismount.

Description

technical field [0001] The invention relates to a rock core holder, in particular to a variable-diameter formation pressure rock core holder. Background technique [0002] In order to measure the physical properties of rock cores (sound velocity, resistivity, porosity, permeability, relative permeability, etc.) under simulated formation pressure conditions, laboratories often use core holders to apply formation pressure. At present, from the point of view of structure and function, there are two types of commonly used core holders: Hassler type core holder (only applies confining pressure) and triaxial core holder (applies true triaxial and false triaxial pressure). type-based. Among them, the Hassler type core holder is the most widely used, and its basic features are: simple structure, good contact is maintained through the end plug with a certain taper and the confining pressure rubber sleeve, strong confining pressure bearing capacity, and the core can be partially dism...

AI Technical Summary

Problems solved by technology

The limitations of these two types of holders are: when used, it is necessary to make special-sized holders for cores of different diameters to achieve effective pressurization of the sample

[0011] The core holder disclosed in the above invention avoids the bottleneck that the temperature change of the core holder under the high pressure state seriously interferes with the coil of the nuclear magnetic resonance probe in the past, and can prevent the interference of the temperature change on the magnet through the thermal insulation structure; But a kind of core holder disclosed in above-mentioned invention can't carry out the measurement of various physical properties to the rock core of different diameters

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