Device and method for evaluating sand carrying capacity of carbon dioxide dry-process fracturing fluid

Abstract

The invention provides a device and a method for evaluating the sand carrying capacity of carbon dioxide dry-process fracturing fluid. The device comprises a high-pressure visual stirring vessel, a carbon dioxide pressurization system, a viscosity improving agent injecting system, a supporting agent adding system, a temperature control system and a data acquisition system, wherein the carbon dioxide pressurization system, the viscosity improving agent injecting system, the supporting agent adding system, the temperature control system and the data acquisition system are connected with the high-pressure visual stirring vessel. All constituent parts are connected with one another through a pipeline and valves to form the device for the sand carrying capacity of the carbon dioxide dry-process fracturing fluid. The device provided by the invention is used for evaluating the sand carrying capacity of the carbon dioxide dry-process fracturing fluid under different phase states (a liquid state or a supercritical state), realizes the visualization and is simple in structure and higher in measuring precision; an operation method is easy to implement; the stirring speed, the temperature and the pressure can be regulated; the quantitative measurement of the sand carrying capacity of the carbon dioxide fracturing fluid from the liquid state to the supercritical state within a greater pressure and temperature range can be realized, so that reliable sand carrying capacity data is provided for fracturing design and field test.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas stimulation technology, and in particular relates to a carbon dioxide dry fracturing fluid sand-carrying performance evaluation device and method. Background technique [0002] Carbon dioxide dry fracturing technology is a means to effectively develop low-permeability, ultra-low-permeability and tight unconventional oil and gas reservoirs. Because it is a water-free fracturing technology, compared with water-based fracturing technology, it saves a lot of water resources , almost no damage to the reservoir, and the effect of increasing production is remarkable. In recent years, a number of oil fields have carried out a large number of related indoor researches on carbon dioxide dry fracturing technology, and conducted several field pilot tests in Sulige gas field, and found that there are some shortcomings in carbon dioxide dry fracturing technology, mainly due to carbon dioxide ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems existing in the existing carbon dioxide dry fracturing fluid performance evaluation experimental device that it is difficult to visually and quantitatively evaluate the sand-carrying performance of carbon dioxide dry fracturing fluid in a relatively large temperature and pressure range, and to obtain effective experimental data.

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