*** REFLECT deliverable 2.2: Report on gas solubility and degassing kinetic (type C)  ***

Chris Boeije 1, Cas Verweij 1, Anushka Tripathi 1, Wolfgang Weinzierl 2, Pacelli Zitha 1 and Anne Pluymakers 1
1 TU Delft, Faculty of Civil Engineering and Geosciences, Department of Geoscience and Engineering, 
2 GFZ German Research Centre for Geosciences, Section Geoenergy

Corresponding author: Chris Boeije
Contact Information:
c.s.boeije@tudelft.nl

Delft University of Technology - Faculty of Civil Engineering and Geosciences
2628 CN Delft
The Netherlands

*** General Introduction ***
This dataset contains data collected during experiments at Delft University
of Technology as part of the European Union's Horizon 2020 project called REFLECT
Deliverables from this project can be retrieved here: https://www.reflect-h2020.eu/deliverables

It is being made public to act as supplementary data for the REFLECT deliverable.

The data in this data set was collected in the Geoscience and Engineering Laboratory of the
Delft University of Technology - Faculty of Civil Engineering and Geosciences, between August 2020
and December 2022.
As part of the REFLECT project, this project has received funding from the European Union’s Horizon 2020 
research and innovation program under Grant Agreement No. 850626.

*** Objectives of study ***
The purpose of these experiments was to investigate degassing of CO2-water mixtures under conditions
relevant to the production of geothermal waters with a specific focus on high salinity (Type C) fluids. 
Topics of interest are the conditions under which free gas bubbles start to form during depressurization 
of these mixtures.

*** Experimental approach ***
Experiments consist of depressurization of CO2-water mixtures inside a high pressure visual cell. 
A high-speed camera along with pressure measurements are used to monitor the depressurization process.
An image analysis routine is used on the obtained images, which allows for determining at which pressure 
free gas bubbles begin to form. The resulting bubble point data is then compared to results from a 
PHREEQC geochemical model.

***Description of the data in this data set***
The data included in this data set show the number of bubbles in an image as a function of the pressure in 
the cell. This is done for various initial conditions of the mixture. Files are given as both Excel and comma 
separated values (CSV) tabulated data. In addition, MATLAB data files (MAT files) are given along with an 
accompanying script (M files) that can be used to plot the data. 

In addition, modelling data of CO2 solubility in high salinity fluids are given, which were obtained using
PHREEQC to allow for comparison between experiments and model. A combintation of the experimental and 
modelling data can be used to recreate the figures in the REFLECT deliverable 2.2 document. MATLAB scripts
are provided to produce figures 4, 5 and 6 from the document. The filenames of these scripts indicate which 
figure can be created with it.