## Abstract

Very few thermodynamic models exist for estimation of density alteration due to solution of CO_{2} in a pure H_{2}O and CaCl_{2}-H_{2}O system. All of these models require density of CaCl_{2} solution to estimate density of CaCl_{2}-H_{2}O-CO_{2} system. Similarly, models presented to calculate CaCl_{2} solution density need pure H_{2}O density in advance. The main approach to model density of CaCl_{2}-H_{2}O-CO_{2} system is based on estimation of density alteration of CaCl_{2}-H_{2}O system due to the solution of CO_{2} mole fraction. Hence, to estimate CO_{2}-CaCl_{2}-H_{2}O system density, density of CaCl_{2} solution is necessary, and to estimate density of CaCl_{2}-H_{2}O system, density of pure H_{2}O is required in advance. Firstly in this paper, density of 0, 1.91, and 4.85 mol/kg CaCl_{2} solutions saturated with CO_{2} at 328.15 to 375.15^{◦}K and 68.9 to 206.8 Bar were measured through laboratory experiments. Then, a new model is developed to estimate the density of CaCl_{2} solutions containing CO_{2} based on the experiments conducted in this study. The average and maximum absolute deviations of the new model from the experimental data are 0.0047 and 0.0177, respectively. Hence, the new model combined with other existing models to separately calculate density of the CaCl_{2} solution can be used to accurately predict density of the CaCl_{2}-H_{2}O-CO_{2} system in a wide range of P-T applicable for subsurface reservoirs.

Original language | English |
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Article number | 2840 |

Journal | Energies |

Volume | 11 |

Issue number | 10 |

DOIs | |

Publication status | Published - 2018 |

Externally published | Yes |

## Keywords

- CaCl-HO-CO system
- Chloride solution density
- Density estimation
- Density measurement
- Limestone reservoirs
- Matrix acidizing
- Well stimulation

## ASJC Scopus subject areas

- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Energy (miscellaneous)
- Control and Optimization
- Electrical and Electronic Engineering