Traditional well logging methods, such as resistivity, acoustic,
nuclear and NMR, provide indirect information related to fluid and
formation properties. The "formation tester," offered in wireline
and MWD/LWD operations, is different. It collects actual downhole
fluid samples for surface analysis, and through pressure transient
analysis, provides direct measurements for pore pressure, mobility,
permeability and anisotropy. These are vital to real-time drilling
safety, geosteering, hydraulic fracturing and economic analysis.
Methods for formation testing analysis, while commercially
important and accounting for a substantial part of service company
profits, however, are shrouded in secrecy. Unfortunately, many are
poorly constructed, and because details are not available, industry
researchers are not able to improve upon them. This new book
explains conventional models and develops new powerful algorithms
for "double-drawdown" and "advanced phase delay" early-time
analysis - importantly, it is now possible to predict both
horizontal and vertical permeabilities, plus pore pressure, within
seconds of well logging in very low mobility reservoirs. Other
subjects including inertial Forchheimer effects in contamination
modeling and time-dependent flowline volumes are also developed.
All of the methods are explained in complete detail. Equations are
offered for users to incorporate in their own models, but
convenient, easy-to-use software is available for those needing
immediate answers. The leading author is a well known
petrophysicist, with hands-on experience at Schlumberger,
Halliburton, BP Exploration and other companies. His work is used
commercially at major oil service companies, and important
extensions to his formation testing models have been supported by
prestigious grants from the United States Department of Energy. His
new collaboration with China National Offshore Oil Corporation
marks an important turning point, where advanced simulation models
and hardware are evolving side-by-side to define a new generation
of formation testing logging instruments. The present book provides
more than formulations and solutions: it offers a close look at
formation tester development "behind the scenes," as the China
National Offshore Oil Corporation opens up its research,
engineering and manufacturing facilities through a collection of
interesting photographs to show how formation testing tools are
developed from start to finish.
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