RE: Powering a Nation !14 Jul 2025 16:08
Thanks both. Never occurs to me to ask AI. So have just asked Chat GPT. Have a feeling it is agreeing with you.
"Does thicker natural gas bearing sands automatically mean a higher flow rate?
Not necessarily. Thicker natural gas-bearing sands can suggest greater potential reserves or storage capacity, but they do not automatically guarantee a higher flow rate. Flow rate (deliverability) depends on several interrelated factors beyond just thickness:
Key Factors Influencing Flow Rate:
1. Permeability:
• This is critical. High-permeability sands allow gas to flow more freely.
• If thick sands are poorly sorted or have low permeability (e.g., due to clay content or cementation), flow rates may still be low.
2. Porosity:
• Higher porosity means more space to store gas, but flow rate still depends on permeability.
3. Pressure Gradient:
• The difference between reservoir pressure and wellbore pressure drives flow. Even thick sands won’t flow well if pressure is low.
4. Saturation:
• If the gas saturation is low (e.g., mixed with water or oil), effective gas flow will be reduced.
5. Completion and Well Design:
• Poorly designed completions (e.g., inadequate perforations or stimulation) can restrict flow, regardless of sand thickness.
6. Reservoir Connectivity:
• Thick but isolated sands (discontinuous or compartmentalized) may not drain efficiently.
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In Summary:
Thicker gas-bearing sands can be favorable, but flow rate depends heavily on rock properties (especially permeability), reservoir pressure, and completion quality. To assess flow potential, you need well tests, core analysis, and petrophysical data, not just thickness alone."
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