Pulsation CO2 foam fracturing and evaluation simulation integrated test device and method

Abstract

The invention discloses pulsating CO2 foam fracturing and an evaluation simulation integrated test device and method. According to the pulsating CO2 foam fracturing and the evaluation simulation integrated test device and method, the preparation of CO2 foam fracturing fluids with different foam qualities is realized through a CO2 pressurizing and liquefying system and a foam fracturing fluid quantitative injection system; a high-temperature and high-pressure foam performance evaluation system can simulate and research the stability performance of CO2 foams with different proportions in a deep high-temperature and high-pressure environment; a pulsating fracturing control system can realize high-frequency large-amplitude pulsating fracturing; a triaxial core holder can simulate a deep in-situ stress environment, and can be combined with a acoustic emission monitoring system to research crack propagation and fracture energy rules in the fracturing process; in addition, the triaxial core holder is combined with a permeability measuring system, so that the change condition of the permeability of a sample before and after fracturing can be evaluated; therefore, the pulse CO2 foam fracturing process of a unconventional natural gas reservoir can be simulated, test data under various different conditions can be obtained, the proportion of the CO2 foam fracturing fluid can be optimized, and the influence of different pulse parameters on the fracturing effect can be researched.

Description

technical field [0001] The invention relates to the technical field of unconventional natural gas exploitation, in particular to a pulsating CO 2 Foam fracturing and evaluation simulation integrated test device and method. Background technique [0002] my country is rich in unconventional natural gas resources (coalbed methane, shale gas, tight sandstone gas, etc.), and its output is about 1 / 10 of the national natural gas output. Unconventional natural gas is a high-calorie clean energy, and its effective exploitation can optimize the energy consumption structure. However, the occurrence conditions of unconventional natural gas resources are complex, and the effect of direct drilling or drilling is not good, and the commercial exploitation of unconventional natural gas cannot be realized. Artificial fracturing measures (hydraulic fracturing, etc.) Volume fracturing is performed on layers to increase gas diversion channels. Traditional hydraulic fracturing measures have ma...

AI Technical Summary

Problems solved by technology

However, the occurrence conditions of unconventional natural gas resources are complicated, and the effect of direct drilling or drilling is not good, and the commercial exploitation of unconventional natural gas cannot be realized. Artificial fracturing measures (hydraulic fracturing, etc.) Volume fracturing of different layers to increase gas diversion channels

Traditional hydraulic fracturing measures have made outstanding contributions to unconventional natural gas exploitation, but there are still several problems in the following aspects: First, the fracturing operation consumes a lot of water, and the fracturing fluid pollutes water resources seriously; Large filtration loss affects the effect of reservoir stimulation; third, the ability to carry proppant is insufficient; fourth, hydraulic fracturing technology is no longer applicable to water-scarce areas and water-sensitive formations

However, the current pulsating CO 2 Foam fracturing technology is only at the theoretical stage, and there is no specific research on how to carry out fracturing schemes and determine the relevant parameters required for fracturing. Therefore, it is urgent to provide pulsating CO 2 Foam fracturing and evaluation simulation integrated test device and method, so that it can be used for CO 2 The parameters required for foam fracturing are tested and determined to provide data support for subsequent practical use

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