Experimental device and method for simulating carbon dioxide saturated fluid-surrounding rock interaction

Abstract

The invention provides an experimental device for simulating carbon dioxide saturated fluid-surrounding rock interaction. A carbon dioxide gas source and a reaction fluid source are respectively connected with an intermediate container, a preheater is respectively connected with the intermediate container and a reaction kettle, and a chemical signal acquisition device is connected with the reaction kettle. A booster pump is arranged between the carbon dioxide gas source and the intermediate container. A constant-pressure constant-flow pump is arranged between the reaction fluid source and the intermediate container. Control valves are arranged between the carbon dioxide gas source and the booster pump, between the booster pump and the intermediate container, between the intermediate container and the preheater and between the preheater and the reaction kettle. A back-pressure valve is arranged between the reaction kettle and the chemical signal acquisition device. The invention further provides an experimental method. According to the device and the method, the process that the carbon dioxide saturated fluid reforms the surrounding rocks of strata with different depths and different positions in a carbon dioxide saturated fluid-surrounding rock system from the deep stratum to the earth surface can be simulated, and the reaction process is monitored in real time on line and recorded and stored.

Description

technical field [0001] The invention relates to the technical field of water-rock reaction process research, in particular to an experimental device and method for simulating the interaction between a carbon dioxide-saturated fluid and surrounding rock. Background technique [0002] The main oil and gas basins in China have all experienced large-scale deep source CO 2 Activity. Contains CO 2 The fluid will carry out dissolution reformation on the deep reservoir. Today's oil and gas exploration practices have revealed the important oil and gas value of carbon dioxide reformed oil and gas reservoirs. The carbon dioxide fluid migrates along the fracture system and continuously reforms the surrounding rock, and the storage performance of the reformed surrounding rock is improved and enhanced. The source of fluid may be deep hydrothermal fluid, formation water or pore water, etc. The source of carbon dioxide may be mantle source, or it may be carbon dioxide in the atmosphere....

AI Technical Summary

Problems solved by technology

[0005] Since this type of device is only designed with one reactor and one fluid booster pump, it can only simulate the water-rock reaction at a certain depth of temperature and pressure, and the reaction pressure condition is relatively simple.

At the same time, due to the lack of a corresponding carbon dioxide gas pressurization system, it is impossible to prepare saturated carbon dioxide fluid corresponding to formation pressure conditions, and it is impossible to truly reproduce the reaction environment

However, only imitating the saturated carbon dioxide fluid-rock reaction in the normal temperature and pressure environment on the surface obviously cannot meet the current needs of deep exploration and exploration of the deep fluid-rock reaction process / mechanism

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