ABSTRACT: A technique was developed for measuring shale pore pressure change caused by simultaneous hydraulic and chemical forces, using preserved shales under simulated in situ conditions. It was found that chemical forces can offset hydraulic forces and can maintain shale pore pressure at a value different than the applied fluid pressure. The influence of shale type, salt type and salt concentration on this pressure difference were investigated. The observed pressure differences are compared with the predictions of osmotic theory, and membrane efficiencies are calculated. Shale permeability is also determined from the test data.
Pore Pressure Change Due to Shale-Fluid Interactions: Measurements Under Simulated Wellbore Conditions
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Ewy, R.T., and R.J. Stankovich. "Pore Pressure Change Due to Shale-Fluid Interactions: Measurements Under Simulated Wellbore Conditions." Paper presented at the 4th North American Rock Mechanics Symposium, Seattle, Washington, July 2000.
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