Study on Phase Behavior in Pores of Different Types of Shales and Its Impact on CO2 Huff-Puff
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Carbon dioxide (CO2) huff-n-puff enhances shale oil recovery by altering phase behavior in nanopores. Smaller pores and increased wettability improve heavy oil component production, optimizing reservoir development.
Area Of Science
- Petroleum Engineering
- Geochemistry
- Nanotechnology
Background
- Shale oil reservoirs possess significant strategic value.
- Nanopores and complex mineralogy in shale reservoirs lead to varied oil production dynamics during CO2 huff-n-puff.
- Understanding phase behavior in different pore sizes is crucial for optimizing CO2 EOR.
Purpose Of The Study
- To develop a phase equilibrium model incorporating nanopore size and wettability effects.
- To establish a numerical model for CO2 huff-n-puff simulations.
- To analyze hydrocarbon production laws in varying pore sizes and wettabilities.
Main Methods
- Constructed a phase equilibrium model considering nanopore size and wettability.
- Developed a CO2 huff-n-puff numerical model based on material conservation.
- Performed simulation calculations to analyze production laws.
Main Results
- Bubble point pressure decreases with reduced pore size, leading to higher liquid and heavy component production from smaller pores during pressure depletion.
- CO2 initially displaces more methane (CH4) in smaller pores; component production becomes more consistent across pore sizes with increased cycling, with slightly higher heavy component production in 10 nm pores.
- Reduced contact angle enhances fluid-solid interaction, lowering bubble point pressure, increasing liquid yield, and boosting heavy component recovery.
Conclusions
- Nanopore size and wettability significantly influence phase behavior and hydrocarbon production during CO2 huff-n-puff.
- Optimizing CO2 injection strategies requires consideration of pore-scale physics and fluid-rock interactions.
- The study provides insights into enhanced oil recovery mechanisms in complex shale reservoirs.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed 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...
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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...
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
Solutions of Gases in Liquids
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...