Measuring and testing – Borehole or drilling – Formation logging
Patent
1996-02-09
1998-06-23
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Formation logging
E21B 4900
Patent
active
057707987
ABSTRACT:
An apparatus and method for evaluating formation damage proximate to the surface of a rock. The invention is applicable to surface tests and to tests downhole in a borehole. A first hollow probe sealingly contacts the rock surface to define a first surface area, and the pressure within the hollow probe is decreased to monitor resulting pressure changes. A second hollow probe contacts the rock surface to define a second surface area having a different size than the first surface area, and the pressure within the hollow second probe is decreased to monitor resulting pressure changes. Differences in the observed pressure changes can be analyzed to evaluate formation damage to the rock surface and near surface. In particular, the thickness of formation damage, and permeability losses caused by such damage, can be assessed. Alternatively, fluid pressure can be injected into the first and second volumes to evaluate the subsequent pressure reduction.
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Goggin, D.J., Thrasher, R.L., Lake, L.W., A Theoretical and Experimental Analysis of Minipermeameter Response Including Gas Slippage and High Velocity Flow Effects, In Situ, 12 (1&2), 79-116 (1988).
Georgi Daniel T.
Michaels John M.
Moody Michael J.
Atkinson Alan J.
Politzer Jay L.
Western Atlas International Inc.
Williams Hezron E.
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