Related Experiment Video
Updated: Jul 16, 2026

Reservoir Condition Pore-scale Imaging of Multiple Fluid Phases Using X-ray Microtomography
Published on: February 25, 2015
The phase behavior of CO2 injection in shale reservoirs with nano-pores
Tao Wan1, Kun Ding2, Qiyong Xiong2
1Faculty of Petroleum, China University of Petroleum (Beijing) at Karamay China 2017592002@cupk.edu.cn +86990 6633510 +86990-6633531.
Abstract:
The main purpose of this paper is to study the solubility of CO2 in oil and water phase under high temperature and pressure. Firstly, CO2-crude oil PVT experiments were carried out to determine the physical parameters of the reservoir fluid in the study field in order to clarify the interaction mechanism of CO2 with the crude oil. Secondly, the solubility of CO2 in the reservoir fluid under different pores and the minimum mixed-phase pressure of the CO2-crude oil system were calculated by the improved Peng-Robinson equation of state. In this paper, the effects of nano-pores limitation on CO2 solubility were studied. The results show that pressure increase is favorable to CO2 dissolution, the solubility increases with the increase of the oil-water ratio. CO2 solubility decreases with temperature increase. The greater the mineralization of formation water, the lower the CO2 solubility. Nanopore confinement causes the phase envelope to contract and the minimum mixed-phase pressure to decrease. When the pore radius is smaller, the restriction of the phase envelope is stronger. In this paper, the minimum mixing pressure of crude oil and carbon dioxide is reduced from 31.25 MPa at 50 nm to 21.25 MPa at 5 nm, thus it is beneficial for enhanced oil recovery (CO2-EOR). Nanopore confinement favors CO2 to enhance shale oil recovery. The results of this study are critical to evaluate the effect of CO2 sequestration, solubility and phase behavior changes of CO2 in shale reservoirs with nano-pores.
More Related Videos
10:18Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
Published on: February 21, 2017
12:18Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography
Published on: October 21, 2018
Related Concept Videos
Phase Transitions: Vaporization and Condensation
Phase Diagrams
Physical Properties Affecting Solubility
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
Porosity and Absorption of Aggregate
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the aggregate...
Porosity in Cement Paste
The balance of water to cement in the mix is critical—it...
Carbonation Shrinkage
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction facilitates the...