Automatic calibration system for volume of shale isothermal adsorption experiment cylinder body

Abstract

The invention provides an automatic calibration system for the volume of a shale isothermal adsorption experiment cylinder body. The volume of a calibration cylinder is changed through a piston and adisplacement sensor, one-time gas injection and multiple-time measurement are achieved, multi-point fitting is adopted, and finally, the accurate cylinder body volume is obtained. A standard block isreplaced by accurate hydraulic equipment, a calibration cylinder sealing cover is omitted, errors caused by the standard block and the calibration cylinder sealing cover are overcome, gas is injectedat a time, the volume is changed multiple times, a multi-point fitting method is adopted, the testing precision is improved, and the testing time and experimental gas are saved.

Description

technical field [0001] The invention belongs to the field of shale gas development, and in particular relates to an automatic calibration system for the cylinder volume of a shale isothermal adsorption experiment. Background technique [0002] The shale adsorbed gas accounts for 25%-85% of the total gas content. When the commonly used volume method is used to test the adsorbed gas, the small error of the cylinder volume will have a very significant impact on the adsorbed gas. The volume calibration method is not to add a standard block first. Measure the pressure of the calibration cylinder and the test cylinder before and after balance, formulate an equation, and then add a standard block of known volume to the calibration cylinder without changing the volume of the calibration cylinder, and then obtain a set of calibration cylinders and test cylinders before and after balance For the pressure, write an equation after adding the standard block, and combine the two equations...

AI Technical Summary

Problems solved by technology

In this process, each measurement needs to be injected and vented once, which consumes a lot of time and experimental gas. In addition, the standard block is prone to wear and bumps during use, and after each standard block is installed, the calibration The number of turns of the cylinder sealing cover knobs cannot be exactly the same, and the human error introduced is too large, resulting in the inaccurate volume of the cylinder body. There is also a method of calculating the volume of the cylinder body through two equations simultaneously, and the calculation efficiency and accuracy are low.

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