System and method for testing sand carrying capacity of fracturing fluid

Abstract

The invention relates to a system for testing sand carrying capacity of fracturing fluid. The system is characterized in that firstly a first gas cylinder and a second gas cylinder are respectively connected with the inlet of a gas purifier through a first valve and a second valve, the outlet of the gas purifier is sequentially connected with a volumetric flowmeter, a refrigeration system and a liquid CO2 storage tank, a third valve is connected between the refrigeration system and the liquid CO2 storage tank, the outlet of the liquid CO2 storage tank is connected with a fourth valve, a first pressure gauge, a fifth valve and a CO2 pump and then converges with a branch connected with a reagent tank and a reagent pump, a safety valve is connected at a junction between two branches, then a one-way valve, a preheater, a first thermometer and a second thermometer are sequentially connected, and then a horizontal sand carrying transport branch is entered to test the transport performance of the fracturing fluid or a vertical sand suspending transport branch is entered to test the sand suspending performance of the fracturing fluid. The invention further discloses a corresponding testing method, which is specially used for simulating and testing the sand carrying capacity of carbon dioxide anhydrous fracturing fluid at different additive proportions under different situations of temperature, pressure and displacement.

Description

Technical field [0001] The present invention relates to the field of fracturing technology, in particular to a test system and a test method for the sand carrying capacity of carbon dioxide anhydrous fracturing fluid. Background technique [0002] With the large-scale development of tight and low-permeability unconventional oil and gas reservoirs, in order to reduce the damage caused by conventional water-based fracturing fluids to reservoirs (especially water-sensitive reservoirs), carbon dioxide waterless fracturing technology is due to its "waterless fracturing". The characteristics of "are attracting attention. CO 2 Anhydrous fracturing technology is mainly based on liquid CO 2 An anhydrous fracturing fluid mixed with a very small amount of chemical additives replaces the traditional water-based fracturing fluid for reservoir reconstruction. While improving the effect of volume fracturing reconstruction, it can effectively protect the reservoir and save a lot of water resourc...

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Problems solved by technology

[0005] In order to overcome the problem of unsuitable equipment and instruments existing in the above-mentioned prior art, the object of the present invention is to provide a carbon dioxide anhydrous fracturing fluid sand-carrying ability testing system and testing method, which is specially used to test the carbon dioxide anhydrous fracturing fluid under different additive ratios. Suspended sand transport capacity of hydraulic fracturing fluid at different temperatures, pressures and displacements

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