Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2006-04-25
2006-04-25
Tsay, Frank S. (Department: 3672)
Wells
Processes
With indicating, testing, measuring or locating
C166S252500, C073S152310
Reexamination Certificate
active
07032661
ABSTRACT:
Formation testing, resistivity and NMR measurements are used concurrently to determine a relative permeability representative of a formation surrounding the borehole. A method and apparatus is provided for accurate determination of the relative permeability for a formation by measuring saturation levels in a region of interest determined from resistivity or NMR readings versus time during formation draw down pressure testing. The method and apparatus determines and effective permeability over time for various saturation levels to determine the relative permeability for the formation at each saturation level and also enables determination of the efficacy of utilizing completion fluids in the formation to increase formation productivity. The method and apparatus enables more accurate determination of effective permeability and the irreducible saturation level. The method and apparatus also provides for determination of whether a pad is sealed properly against a borehole wall and determines if a probe is clogged.
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Georgi Dan
Kruspe Thomas
Meister Matthias
Baker Hughes Incorporated
Madan Mossman & Sriram P.C.
Tsay Frank S.
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