Measuring and testing – Borehole or drilling – Fluid flow measuring or fluid analysis
Reexamination Certificate
2005-08-02
2005-08-02
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Fluid flow measuring or fluid analysis
C073S152230, C073S152240, C073S152270, C073S152310, C073S152280, C073S152460
Reexamination Certificate
active
06923052
ABSTRACT:
Methods for estimating formation pressure from data taken during the drawdown cycle are presented. In one aspect, a method of determining a formation pressure during drawdown of a formation comprises sampling fluid from a formation using a downhole tool having a sample volume and a fluid sampling device. At least one time dependent parameter of interest related to the fluid is determined during the drawdown. The at least one time dependent parameter is analyzed using a plurality of calculation techniques to determine the formation pressure. The techniques include (i) a first pressure derivative technique; (ii) a second pressure derivative technique; (iii) a formation rate analysis technique; (iv) a dp/dt-ratio technique; and (v) a stepwise drawdown technique.
REFERENCES:
patent: 5233866 (1993-08-01), Desbrandes
patent: 5602334 (1997-02-01), Proett et al.
patent: 5708204 (1998-01-01), Kasap
patent: 5803186 (1998-09-01), Berger et al.
patent: 5959203 (1999-09-01), Ajjoul
patent: 2002/0060094 (2002-05-01), Meister et al.
patent: 2004/0045706 (2004-03-01), Pop et al.
patent: 2004/0111216 (2004-06-01), Kneissl et al.
“Robust and Simple Graphical Solution for Wireline Formation Tests: Combined Drawdown and Buildup Analyses”; E. Easap, K. Huang and D. Georgi; Society of Petroleum Engineers; SPE 36525; pp. 343-357.
“Enhanced Wireline Formation Tests in Low Permeability Formations: Quality Control Through Formation Rate Analysis”; Jaedong Lee & John Michaels; Society of Petroleum Engineers; SPE 60293; pp. 1-7.
Krueger Sven
Lee Jae-dong
Meister Matthias
Niemeyer Eick
Baker Hughes Incorporated
Bellamy Tamiko
Madan Mossman & Sriram P.C.
Williams Hezron
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