Enhanced oil recovery (abbreviated EOR), also called tertiary recovery, is the extraction of crude oil from an oil field that cannot be extracted otherwise. Whereas primary and secondary recovery techniques rely on the pressure differential between the surface and the underground well, enhanced oil recovery functions by altering the physical or ...

Gas injection, which uses gases such as natural gas, nitrogen, or carbon dioxide (CO 2) that expand in a reservoir to push additional oil to a production wellbore, or other gases that dissolve in the oil to lower its viscosity and improves its flow rate. Gas injection accounts for nearly 60 percent of EOR production in the United States.

2025年2月19日 · Enhanced oil recovery (EOR) in unconventional reservoirs has been stymied by its low-permeability, low-porosity environment. Liberty Resources performed water-alternating-gas (WAG) EOR...

2024年12月25日 · Enhanced oil recovery methods are aimed at creating a more efficient movement of displacing and displaced fluids in the reservoir by maintaining a favorable mobility coefficient M < 1 (to prevent early gas breakthrough) and increasing the capillary number (N ca), which is to reduce surface tension (IFT) (Afzali et al., 2018).

Gas enhanced oil recovery is a highly successful commercial process. The biggest challenge for gas EOR is the availability of injection gas. Better mobility control methods to improve the sweep efficiency would make better use of the available gas and improve the economics of the process, so ways to do that are one of the main goals of this ...

2023年1月1日 · One of the most accepted and widely used technologies for enhanced oil recovery (EOR) is gas flooding. Understanding the gas flooding requires a good understanding of the interaction of phase behavior and flow in the reservoir as well as surface separation technologies and compression processes.

2023年1月15日 · Gas EOR involves injecting gases—such as natural gas, nitrogen, carbon dioxide, methane, or other hydrocarbon gases—into oil reservoirs to dissolve oil and improve its flow to production wells. Thermal EOR is used in deposits with …

2025年3月24日 · 1. Introduction. In recent years, significant advancements in enhanced oil recovery (EOR) techniques have emerged, reflecting the ongoing need to optimize oil recovery from increasingly complex and challenging reservoirs [1 – 5].Notable innovations include the integration of nanotechnology, bio-surfactants, and smart water flooding, each demonstrating the potential to enhance oil recovery ...

Similar to how steam or waterflood with polymer injection stimulates reservoir production, Chevron also uses gas EOR technology to help hydrocarbons flow more easily to the well. After first injecting water into the reservoir, our engineers pump carbon dioxide or hydrocarbon gas through the same injection wells.

2025年3月24日 · Due to the serious gas channeling, high water cut, and poor thermal recovery efficiency in heavy oil reservoirs after multiple cycles of huff-n-puff, it is a challenging process to recover oil from heavy oil reservoirs after multiple cycles of huff-n-puff. Chemical compound flooding (CCF) systems are being employed for oil recovery. To clarify the optimal injection mode and slug volume of CCF ...