Speaker
Description
Supercritical CO₂ (scCO₂) viscosification has broad practical application prospects in carbon sequestration, geothermal development, and fracturing. Hydrocarbon-based oligomers are considered to have significant potential for industrial application. However, the viscosification mechanism of hydrocarbon-based oligomer-scCO₂ remains unclear. This study employs molecular dynamics(MD) simulations to investigate the dissolution and viscosification behavior of hydrocarbon-based oligomer-scCO, exploring the direct viscosification mechanism.
The direct coexistence method (DCM) was used to calculate the solubility of hydrocarbon-based oligomers in scCO₂. The results indicate that the solubility increases with higher pressure, more and longer side chains. It decreases significantly with increasing oligomer molecular weight. This study explores the effects of molecular weight, concentration, and molecular structure (number and length of side chains) of hydrocarbon-based oligomers on scCO₂ viscosification. Diffusion property studies reveal that hydrocarbon-based oligomers effectively restrict the motion of CO₂ molecules, thereby achieving a viscosification effect. Increasing molecular weight, concentration, and the number and length of side chains all suppress the diffusion of scCO₂. The study of distribution morphology shows that hydrocarbon-based oligomers in scCO₂ do not intertwine or associate. This behavior is not influenced by molecular weight, concentration, and molecular structure. Interaction energy analysis demonstrates that increasing molecular weight, side chain number, and length enhances the interaction between oligomer and CO₂, while the interaction strength remains unaffected by concentration.
This study quantifies the effects of molecular weight, concentration, and molecular structure of hydrocarbon-based oligomers on their diffusion properties, distribution morphology, and interactions in scCO₂, revealing the microscopic mechanisms of molecular motion. From a microscopic perspective, it elucidates the viscosification mechanism and provides theoretical support for the application of hydrocarbon-based oligomers in CO₂ viscosification.
| Country | China |
|---|---|
| Acceptance of the Terms & Conditions | Click here to agree |
