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Quantitative Analysis of Natural Gas Diffusion Characteristics in Tight Oil Reservoirs Based on Experimental and
Baishuo Liu1,2, Chuanjin Yao1,2, Yaqian Liu1,2
1Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, People's Republic of China.
ACS Omega
|June 16, 2023
Summary
Natural gas diffusion in tight reservoirs is crucial for enhanced oil recovery. High pressure, permeability, and fractures improve diffusion, impacting gas flooding and huff-n-puff operations.
Area of Science:
- Petroleum Engineering
- Reservoir Engineering
- Geochemistry
Background:
- Natural gas injection is vital for tight reservoir development.
- Understanding gas diffusion is key for predicting reservoir performance and optimizing injection strategies.
Purpose of the Study:
- To investigate the diffusion characteristics of natural gas in tight reservoirs.
- To analyze the impact of various factors (porous medium, pressure, permeability, fractures) on gas diffusion.
- To evaluate the influence of diffusion on gas flooding and huff-n-puff recovery.
Main Methods:
- Construction of a high-pressure, high-temperature oil-gas diffusion experimental device.
- Calculation of diffusion coefficients using mathematical models for bulk oil and cores.
- Numerical simulation of natural gas diffusion in gas flooding and huff-n-puff processes.
Main Results:
- Diffusion occurs in three stages: instability, diffusion, and stable.
- Favorable conditions for diffusion include absence of medium, high pressure, high permeability, and presence of fractures.
- Fractures enhance early gas diffusion, reduce equilibrium time, and increase pressure drop.
- High diffusion coefficients lead to shorter diffusion distances, smaller sweep ranges, and lower overall oil recovery, but improve oil washing efficiency near the injection well.
Conclusions:
- Diffusion characteristics significantly influence tight reservoir performance during gas injection.
- Optimizing injection parameters requires understanding the interplay between diffusion and reservoir properties.
- The study provides theoretical guidance for natural gas injection in tight oil reservoirs.
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