Method and device for measuring thermal expansion coefficient of shale under in-situ conversion condition

By using an integrated experimental device under the in-situ conversion conditions of mud shale, including three-axis pressurization, constant temperature heating and pressure control systems, combined with optical detection technology, the problem of difficulty in measuring the thermal expansion coefficient of mud shale in the existing technology is solved, and high-precision thermal expansion coefficient measurement is achieved.

CN119688772AActive Publication Date: 2025-03-25PETROCHINA CO LTD
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Patent Information

Application Number
CN202311246247.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-25
Publication Date
2025-03-25
Estimated Expiration
2043-09-25

AI Technical Summary

Technical Problem

The prior art is difficult to efficiently measure the thermal expansion coefficient under in-situ temperature and pressure conditions of mud shale, and the existing equipment cannot meet the needs of triaxial pressure, high temperature and multi-directional testing of large samples.

Method used

A device including an experimental chamber, a three-axis pressurization device, an optical detector, a constant temperature heating device and a pressure control system is used to measure the thermal expansion coefficient of mud shale under different conditions by applying true three-axis pressure, heating and adjusting the fluid pressure, combined with optical detection technology.

Benefits of technology

The high-precision measurement of the thermal expansion coefficient of mud shale under the in-situ conversion conditions of mud shale can truly reflect the thermal expansion behavior of rock samples under formation conditions and have high measurement accuracy.

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Abstract

The invention provides a method and device for measuring the thermal expansion coefficient of shale under the in-situ conversion condition, and the method comprises the steps: processing a shale sample into a rock sample, and measuring the size of the rock sample; fixing an optical detector, calibrating the experiment cabin, loading a sample, and obtaining calibration data of the experiment cabin; the optical detector is used for measuring initial projection data of the experiment bin in the length, width and height directions at normal temperature and normal pressure; applying triaxial pressure to the rock sample through a triaxial pressurizing device; raising the temperature of the rock sample to an equilibrium temperature point through a constant-temperature heating device to determine the temperature difference between the equilibrium temperature point and a normal-temperature temperature point; measuring projection data under a balance temperature point by using an optical detector; the fluid pressure in the experiment bin is adjusted to the in-situ conversion actual fluid pressure through the pressure control system; and calculating the thermal expansion coefficients of the rock sample in the length, width and height directions according to the measured data. According to the invention, the thermal expansion coefficients of the shale in three directions can be measured at the same time under the conditions of true triaxial pressure, different temperatures and different flowing pressures, and the measurement precision is high.
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