Introduction
On-going observation wells can be used to help determine if field development area has passed desorption point. The Corbett Creek Mannville CBM (Alberta, Canada) project implemented a series of test wells to observe regional pressure response during development. The figure below illustrates how average reservoir pressure changes with time as an increasing amount of gas begins to dominate the cleat system.
When production is dominately water, average reservoir pressure declines sharply, but then declines at a slower rate due to the exspanion of gas. Refer to Permeability Anistropy for an additional example.
A similar approach was used for the Galilee Glenaras Energy pilot (2022) where additional vertical wells were added to the pilot for dedicated pressure monitoring.
References:
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C. L. Jordan “Maximizing Production: CBM Well Testing & Data Management”, Pertamina CBM Visit & Workshop, 18 - 22, June 2013, QLD, AU
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David Casey, “RIU Good Oil & Gas Energy Conference Presentation”, Galilee Energy, Sept 6 and 7th, 2022