Core Holder

Abstract

The invention relates to a core holding unit used for the field of oil-gas exploration and development. The core holding unit comprises a confining pressure kettle, a positioning plug, an adjusting plug and a rubber sleeve assembly. A confining pressure cavity is formed in space between the rubber sleeve assembly and the confining pressure kettle. The confining pressure kettle is of a carbon fiber-metal-engineering plastic composite structure. The confining pressure kettle comprises metal structure thread rings fixed to the two ends of the confining pressure kettle respectively, a shell laid on carbon fibers on the outer sides of the thread rings, and an engineering plastic lining attached to the inner wall of the shell. The two ends of the lining abut against the positioning plug and the adjusting plug respectively, the positioning plug and the adjusting plug are each provided with a pressing barrel, the pressing barrels are fixedly connected to the thread rings, and the pressing barrels press and fix the positioning plug and the adjusting plug. The core holding unit of a composite structure is suitable for high-temperature and high-pressure environments.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a core holder. Background technique [0002] Rock is the main object of geological exploration. It is composed of one or more minerals and has a certain structure. The rock structure records the geological change process like calligraphy and painting, and the analysis of the rock structure can confirm the geological composition, rock properties, and geological change process characteristics. [0003] The core holder is a special device for clamping and sealing the core to complete the core permeability, porosity test or various core displacement experiments. Its main function is to put the core sample to be tested or tested into it, and It is ensured that when the test fluid passes through the front and rear ends of the core sample, the side surface of the rock sample can be completely sealed. [0004] The CT core holder can be used for X-ray scanning of t...

AI Technical Summary

Problems solved by technology

Engineering plastics also have a strong ability to absorb X-rays, so the wall thickness of the confining pressure kettle body should not be too large, which limits the operating pressure of the core holder, so the working pressure of the general CT core holder is relatively low; The pressure bearing capacity of engineering plastics will be reduced under high temperature conditions, so they cannot work under high temperature conditions; due to the low pressure bearing capacity of engineering plastics, the inner diameter of the confining pressure kettle should not be too large, so it is generally only suitable for analysis and detection of diameter Core samples under 1 inch

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