Carbon dioxide energy storage composite fracturing experiment device

Abstract

The invention relates to a carbon dioxide energy storage composite fracturing experiment device. The device comprises a rock core loading device, a supercritical carbon dioxide generating device, an injection pump system, a vacuum pump system, a gas-liquid separation device, an acoustic emission monitoring device and a data collection system, wherein a gas phase inlet of the rock core loading device is connected with the supercritical carbon dioxide generating device, a liquid phase inlet of the rock core loading device is connected with the injection pump system, a gas phase outlet of the rock core loading device is connected with the vacuum pump system, a liquid phase outlet of the rock core loading device is connected with the gas-liquid separation device, a pressure sensor and a temperature sensor are arranged in the rock core loading device, an acoustic emission probe is arranged on the rock core loading device, the data collection system is respectively connected with the pressure sensor and the temperature sensor, the acoustic emission probe is connected with the acoustic emission monitoring device, and the data collection system is connected with the acoustic emission monitoring device. According to the carbon dioxide energy storage composite fracturing experiment device, the energy storage effect and flowback efficiency of carbon dioxide in different displacement modescan be evaluated.

Description

technical field [0001] The invention relates to the field of carbon dioxide energy storage composite fracturing, in particular to a carbon dioxide energy storage composite fracturing experimental device. Background technique [0002] CO 2 Energy storage composite fracturing is based on supercritical CO 2 As a pre-energy storage fracturing medium, fracturing fluid is used as a post-proppant as a stimulation measure that is beneficial to unconventional reservoirs. [0003] Tight oil is a kind of unconventional oil resources, the basic characteristics are that the source rock is in the oil window, the source-reservoir interbed or close to each other, the reservoir is tight, and the permeability of overlying matrix is ​​≤0.1×10 -3 um 2 (air permeability<1×10 -3 um 2 ), a single well has no natural production capacity or the natural production capacity is lower than the lower limit of commercial oil production, but commercial oil production can be obtained under certain e...

AI Technical Summary

Problems solved by technology

However, there are some problems in the construction process: one is CO 2 During energy storage fracturing, liquid CO 2 Easy to vaporize at low temperature; the second is CO 2 The friction of the pipeline is too high, the sand carrying capacity is insufficient, and the filtration loss is too large, which directly affects the construction process; third, compared with conventional hydraulic fracturing, CO 2 The energy storage fracturing process is too complicated, which increases the difficulty of scientific research

[0015] The above studies confirmed that the injection of CO 2 It has a very good effect on increasing the formation pressure, and the flowback efficiency is high during pressure-controlled drainage, but there is a lack of indoor experimental methods to analyze CO2 displacement under different displacement methods. 2 Evaluate the energy storage effect and flowback efficiency

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