Batch experimental device of water-rock reaction in CO2 geological storage

Abstract

The invention relates to a batch experimental device of water-rock reaction in CO2 geological storage. The batch experimental device comprises a reaction kettle, a CO2 gas cylinder, a water inlet pipe and a first exhaust valve, wherein a kettle head and a kettle body of the reaction kettle are connected by a detachable ring seal, the kettle body is arranged in a heater, and water and rock samples are arranged in the kettle body; the CO2 gas cylinder is connected into the kettle body through a first gas valve; the water inlet pipe is connected into the kettle body through a water inlet valve; and the first exhaust valve is connected into the kettle body. The batch experimental device can meet the temperature and pressure requirements of CO2-water-rock reaction, enable a CO2-water-rock reaction experiment to add sufficient water, rock and gas samples, prevent bringing air during the process of adding gas and maintain constant pressure during the reaction process, and further has the characteristics of simple operation and more economic property.

Description

technical field [0001] The invention relates to a water-rock reaction experimental device, in particular to a device suitable for CO 2 CO in geological storage 2 - Batch reaction setup for water-rock reaction studies. Background technique [0002] CO 2 Geological storage is the CO that will be captured to mitigate climate change 2 Emerging environmental technologies for gas storage in subterranean rock formations. in CO 2 During the whole process of injection and storage, CO 2 The reaction between formation water and rocks for CO 2 The injection rate, storage capacity and security of the storage site all have a major impact. [0003] The laboratory batch experiment is to study CO 2 - One of the basic methods of water-rock reaction, which can simulate the reaction process under formation temperature and pressure conditions, discuss the reaction mechanism through the analysis of solid and liquid phase reaction products, and establish the thermodynamic model of the reac...

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Problems solved by technology

[0005] (1) Device temperature, pressure range and CO 2 -Water-rock reaction mismatch

[0006] Because the temperature and pressure range of conventional reactors cannot cover CO 2 - The temperature and pressure required for the water-rock reaction experiment cannot meet the research requirements; or the upper limit of the required temperature and pressure is greatly exceeded, resulting in an increase in cost

[0007] (2) Device filling method and CO 2 -Water-rock reaction experiment does not match

There are two main disadvantages of this gas filling method: one is that the reaction kettle body is opened during the gas filling process, causing air to enter the kettle body, changing the redox conditions of the reaction, and introducing CO removal 2 -Other reactions other than the water-rock reaction; the second is that as the reaction proceeds, CO 2 Continuous consumption, resulting in a decrease in reaction pressure, unable to maintain a constant pressure

[0009] (3) Device pressurization method and CO 2 -Water-rock reaction experiment does not match

Since this pressurization method is usually aimed at high temperature and high pressure reactions, its temperature and pressure are higher than those of CO 2 -Water-rock is much higher, so the volume of the reaction chamber is small, resulting in the addition of CO 2 , the amount of water and rocks is small, and when the reactants, especially water and rock samples, are less, it often cannot meet the requirements of reaction product analysis

[0011] (4) The cost of the pressure control device is too high

[0013] From the above analysis and a large number of investigations, it can be found that for CO 2 - An economical and practical experimental system for water-rock reaction experiments has not yet been established

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