Impact of Natural Fractures in Drainage Volume Calculations and Optimal Well Placement in Tight Gas Reservoirs

2011 ◽  
Author(s):  
Suksang Kang ◽  
Akhil Datta-Gupta ◽  
William John Lee
Keyword(s):  
Tight Gas ◽  
Natural Fractures ◽  
Gas Reservoirs ◽  
Well Placement ◽  
Tight Gas Reservoirs ◽  
Drainage Volume ◽  
Volume Calculations ◽  
Optimal Well Placement

Evaluation of damage mechanisms and skin factor in tight gas reservoirs

2011 ◽  
Vol 51 (1) ◽  
pp. 639 ◽  
Author(s):  
Hassan Bahrami ◽  
Reza Rezaee ◽  
Delair Nazhat ◽  
Jakov Ostojic
Keyword(s):  
Significant Influence ◽  
Permeability Reduction ◽  
Tight Gas ◽  
Natural Fractures ◽  
Gas Reservoirs ◽  
Damage Mechanisms ◽  
Well Productivity ◽  
Tight Gas Reservoirs ◽  
Skin Factor ◽  
Water Blocking

Tight gas reservoirs normally have production problems due to very low matrix permeability and significant damage during well drilling, completion, stimulation and production. Therefore, they may not flow gas at optimum rates without advanced production improvement techniques. The main damage mechanisms and the factors that have significant influence on total skin factor in tight gas reservoirs include: mechanical damage to formation rock; plugging of natural fractures by mud solid particle invasion; relative permeability reduction around wellbore as a result of filtrate invasion; liquid leak-off into the formation during fracturing operations; water blocking; skin due to wellbore breakouts; and the damage associated with perforation. Drilling and fracturing fluids invasion mostly occurs through natural fractures and may also lead to serious permeability reduction in the rock matrix that surrounds the natural or hydraulic fractures. This study represents an evaluation of different damage mechanisms in tight gas formations, and examines the factors that can have significant influence on total skin factor and well productivity. Reservoir simulation was carried out based on a typical West Australian tight gas reservoir to understand how well productivity is affected by each of the damage mechanisms, such as natural fracture plugging, mud filtrate invasion, water blocking and perforation. Furthermore, some damage prevention and productivity improvement techniques are proposed, which can help improve well productivity in tight gas reservoirs.

Data Acquistion and Formation Evaluation Strategies in Anistrospic, Tight Gas Reservoirs

2008 ◽  
Author(s):  
Hans de Koningh ◽  
Bernd Heinrich Herold ◽  
Koksal Cig ◽  
Fahd Ali ◽  
Sultan Mahruqy ◽  
...  
Keyword(s):  
Tight Gas ◽  
Gas Reservoirs ◽  
Tight Gas Reservoirs ◽  
Formation Evaluation ◽  
Evaluation Strategies ◽  
Data Acquistion
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