Logging while drilling system

Details Logging while drilling system Logging while drilling system

2011-08-23

2011-08-23

Charioui, Mohamed (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C702S006000, C702S009000, C702S011000, C702S012000

Reexamination Certificate

active

08005618

ABSTRACT:
A logging-while-drilling system for efficiently providing a reliable measurement of various petrophysical properties of subsurface earth formations. The logging-while-drilling system generally includes drilling a wellbore within an earth formation, circulating a fluid within the wellbore and injecting it inside the earth formation under pressure, taking a first measurement of the earth formation as altered by the injected fluid within the earth formation during an initial stage of drilling the wellbore, taking a second measurement of the earth formation as altered by the injected fluid within the earth formation during a later stage after the initial stage of drilling the wellbore and determining a zero-time state measurement of the earth formation from a combination of the first measurement and the second measurement, wherein the zero-time state measurement represents the earth formation prior to drilling the wellbore, and determining an infinite-time state measurement of the earth formation from another combination of the first measurement and the second measurement, wherein the infinite-time state measurement represents the earth formation as altered by the injected fluid within the earth formation, assuming the injection had continued indefinitely. Different combinations of the zero-time state measurement, the first measurement, the second measurement, and the infinite-time state measurement, are used to determine the petrophysical parameters of the earth formation, such as but not limited to, volumetric composition, permeability, wettability, and reservoir rock-type.

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Well logging, Wikipedia website  available at http://en.wikipedia.org/wiki/Well—logging>.

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