Evaluation of Damage Mechanisms and Skin Factor in Tight Gas Reservoirs

2011 ◽  
Author(s):  
Hassan Bahrami ◽  
Mohammad Reza Rezaee ◽  
Jakov Ostojic ◽  
Delair Honer Nazhat ◽  
Michael Benedict Clennell
Keyword(s):  
Tight Gas ◽  
Gas Reservoirs ◽  
Damage Mechanisms ◽  
Tight Gas Reservoirs ◽  
Skin Factor

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.

Fracturing in Tight-Gas Reservoirs: Application of SCAL Methods To Investigate Formation-Damage Mechanisms

2008 ◽  
Author(s):  
Brigitte Bazin ◽  
Samir Bekri ◽  
Olga Vizika ◽  
Benjamin Herzhaft ◽  
Eric Aubry
Keyword(s):  
Formation Damage ◽  
Tight Gas ◽  
Gas Reservoirs ◽  
Damage Mechanisms ◽  
Tight Gas Reservoirs

Fracturing in Tight Gas Reservoirs: Application of Special-Core-Analysis Methods To Investigate Formation-Damage Mechanisms

SPE Journal ◽  
2010 ◽  
Vol 15 (04) ◽  
pp. 969-976 ◽  
Author(s):  
Brigitte Bazin ◽  
Samir Bekri ◽  
Olga Vizika ◽  
Benjamin Herzhaft ◽  
Eric Aubry
Keyword(s):  
Formation Damage ◽  
Core Analysis ◽  
Tight Gas ◽  
Gas Reservoirs ◽  
Damage Mechanisms ◽  
Tight Gas Reservoirs ◽  
Analysis Methods ◽  
Special Core Analysis

scholarly journals Estimation of Skin Factor for Wells in Tight Gas Reservoirs

2010 ◽  
Author(s):  
D. Sun ◽  
D. Georgi ◽  
G. Michel ◽  
R. Pour ◽  
J. Wu ◽  
...  
Keyword(s):  
Tight Gas ◽  
Gas Reservoirs ◽  
Tight Gas Reservoirs ◽  
Skin Factor

Evaluation of Damage Mechanisms in Tight Gas Reservoirs: Field Example from Perth Basin

2015 ◽  
Author(s):  
Nick Bahrami ◽  
Samaneh Soroush ◽  
Mofazzal Hossain ◽  
Arshad Lashari ◽  
Muhammad Daloma ◽  
...  
Keyword(s):  
Tight Gas ◽  
Gas Reservoirs ◽  
Damage Mechanisms ◽  
Tight Gas Reservoirs

scholarly journals Modified Horizontal Well Productivity Model for a Tight Gas Reservoir Subjected to Non-Uniform Damage and Turbulence

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8334
Author(s):  
Samuel O. Osisanya ◽  
Ajayi Temitope Ayokunle ◽  
Bisweswar Ghosh ◽  
Abhijith Suboyin
Keyword(s):  
Flow Rate ◽  
Horizontal Well ◽  
Horizontal Wells ◽  
Total Production ◽  
Tight Gas ◽  
Gas Reservoirs ◽  
Well Productivity ◽  
Tight Gas Reservoirs ◽  
Skin Factor ◽  
Tight Gas Reservoir

Tight gas reservoirs are finding greater interest with the advancement of technology and realistic prediction of flow rate and pressure from such wells are critical in project economics. This paper presents a modified productivity equation for tight gas horizontal wells by modifying the mechanical skin factor to account for non-uniform formation damage along with the incorporation of turbulence effect in the near-wellbore region. Hawkin’s formula for calculating skin factor considers the radius of damage as a constant value, which is less accurate in low-permeability tight gas reservoirs. This paper uses a multi-segment horizontal well approach to develop the local skin factors and the equivalent skin factor by equating the total production from the entire horizontal well to the sum of the flow from individual segmented damaged zones along the well length. Conical and horn-shaped damaged profiles are used to develop the equivalent skin used in the horizontal well productivity equation. The productivity model is applied to a case study involving the development of a tight gas field with horizontal wells. The influence of the horizontal well length, damaged zone permeability, drainage area, reservoir thickness, and wellbore diameter on the calculated equivalent skin (of a non-uniform skin distribution) and the flow rate (with turbulence and no turbulence) are investigated. The results obtained from this investigation show significant potential to assist in making practical decisions on the favorable parameters for the success of the field development in terms of equivalent skin factor, flow rate, and inflow performance relationships (IPR).

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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