StimuFrac Compressibility as a Function of CO2 Molar Fraction
Description
Compressibility values were obtained in a range of pressures at 250degC by employing a fixed volume view cell completely filled with PAA aqueous solution and injecting CO2 at constant flow rate (0.3mL/min). Pressure increase as a function of supercritical CO2 (scCO2) mass fraction in the mixture was monitored.
The plot shows the apparent compressibility of Stimufrac as a function of scCO2 mass fraction obtained in a pressure range between 2100-7000 psi at 250degC.
At small mass fractions of scCO2 the compressibility increases probably due to the dissolution/reaction of CO2 in aqueous PAA and reaches a maximum at mCO2/mH2O = 0.06. Then, compressibility decreases showing a linear relationship with scCO2 mass fraction due to the continuous increase in density of the binary fluid associated to the pressure increase.
Resources
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This excel sheet reports compressibility of PNNL's StimuFrac fluid as a function of CO2 concentration |
https://gdr.openei.org/files/870/StimuFrac%20compressibility.xlsx |
Tags
- stimufrac
- fluid-compressibility
- hydraulic-fracturing
- compressibility
- carbon-dioxide
- co2
- mass-fraction
- stimulation
- geothermal