Rock core holder for CT scanning

Abstract

The invention provides a rock core holder for CT scanning and relates to the technical field of oil-gas field development. The rock core holder comprises a rubber sleeve, a carbon fiber cylinder and an electric heating sleeve which are sequentially arranged in a sleeved mode from inside to outside and are vertically through cylindrical bodies, an annular confining pressure cavity is formed between the rubber sleeve and the carbon fiber cylinder, a thermocouple is arranged in the confining pressure cavity, the thermocouple and an electrical heating sleeve are electrically connected with a temperature controller, the top end of the carbon fiber cylinder is in sealed connection with a plug, the bottom end of the carbon fiber cylinder is in sealed connection with a base, the plug, the base and the inner wall surface of the rubber sleeve define a core-containing holding cavity, a liquid flowing-out hole communicated with the holding cavity is formed in the plug, a liquid injection hole communicated with the holding cavity and a confining pressure liquid injection hole communicated with the confining pressure cavity are formed in the base, and the rock core holder can achieve stable core scanning under high-temperature and high-pressure conditions.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field development, and particularly relates to a core holder for CT scanning used for studying the dynamic distribution characterization and change law of microscopic remaining oil at the pore throat scale. Background technique [0002] Accurately describing the distribution of remaining oil in the formation is a difficult task in oil field development. A clear understanding of the pore structure, particle properties, fluid distribution, and dynamic migration characteristics of two-phase fluids is the basic method for remaining oil research and the basis for improving oil recovery. In recent years, CT scanning technology has been widely used in oil and gas field development at home and abroad. CT scanning technology can perform multi-scale structural characterization of the core without causing damage to the internal structure of the rock. The application of this technology in the field of petrole...

AI Technical Summary

Problems solved by technology

Most of the commonly used CT scanning methods at this stage are CT scans of exposed cores without core holders, which cannot consider formation conditions such as high temperature and high pressure, and the accuracy of the identification results needs to be verified

[0003] However, existing conventional core holders cannot be directly applied to CT scanning technology

First of all, the material of the conventional core holder cannot meet the requirements of non-attenuating penetration of X-rays, and cannot scan and image the core; secondly, the diameter of the conventional core holder is not small enough, resulting in a very low splitting rate of CT scanning , it is impossible to clearly identify the state of remaining oil in the pore throat, and it is impossible to study the change law of remaining oil; thirdly, the existing core holder is not resistant to high temperature, and cannot realize stable scanning under high temperature and high pressure conditions, nor can it Realize automatic control of temperature and pressure in the holder

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