an analog co 2 Method of dynamic process of displacement and displacement of shale gas

Abstract

The invention provides a method for simulating the dynamic process for displacing and replacing shale gas through CO2. Based on a corresponding simulation device, the method mainly comprises the steps that a shale powdered sample is placed in a sample chamber of a sand-filled pipe, and the initial state of the sample is set according to the practical stratum condition; after a pipe volume is calibrated, an appropriate amount of CH4 is introduced, an experiment for displacing and replacing the shale gas through CO2 is conducted, experimental data is measured according to a volumetric flow meter at the inlet end, a volumetric flow meter at the outlet end and an infrared-ray gas analyzer, and the displacing and replacing effect can be evaluated through calculation. According to the method for simulating the dynamic process for displacing and replacing the shale gas through CO2, the action effect of the displacing and replacing effect can be monitored in real time, and an influence rule of factors such as temperature, pressure and injection displacement capacity on the dynamic process for displacing and replacing CH4 through CO2 is obtained.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development engineering, in particular to a simulated CO 2 A method for the dynamic process of displacement of shale gas. Background technique [0002] With the deepening of the exploration and development of shale gas resources, the relevant hydraulic fracturing technology has gradually matured. At the same time, the technology consumes a lot of water resources and can cause pollution to the formation. It has also attracted people's attention. CO 2 As a new technology for developing shale gas, displacement and replacement of shale gas is one of the hot research topics at home and abroad. Current Research CO 2 The methods of displacement and replacement are mostly for coal seams, less for shale; secondly, regarding CO 2 Most of the devices for displacement and replacement of shale gas are limited by the measurement devices, and it is difficult to monitor the progress of the experimen...

AI Technical Summary

Problems solved by technology

Current Research CO 2 The methods of displacement and replacement are mostly for coal seams, less for shale; secondly, regarding CO 2 Most of the devices for displacement and replacement of shale gas are limited by the measurement devices, and it is difficult to monitor the progress of the experiment in real time

Therefore, the calculation results of the research data have a certain lag in the experimental process, and it is impossible to quantitatively evaluate the replacement effect in real time.

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