Electricity: measuring and testing – Particle precession resonance – Using well logging device
Reexamination Certificate
2007-12-28
2010-06-22
Arana, Louis M (Department: 2831)
Electricity: measuring and testing
Particle precession resonance
Using well logging device
C324S306000
Reexamination Certificate
active
07741841
ABSTRACT:
The use of time-lapsed NMR diffusivity measurements in an observation well is disclosed. The observation well is cased in the zone of interest with non-magnetic and non-conductive casing that is invisible to the NMR tool. Second, because NMR measurements have a dead zone in front of the antenna depending on the spatial variation of the fixed magnet strength, for example about 2.7 inches, a distance between the casing and the formation is reduced to less than the dead zone length by drilling the observation well at small deviation of about 5° and running the casing without centralizers. Both the casing and the pad-type NMR tool will follow the low side of the borehole, ensuring the measurement volume of the NMR tool is inside the formation and beyond the annulus. With the appropriate observation well completion, time-lapse diffusivity measurements with pad-type NMR tools can address several shortcomings in the current practice of monitoring EOR processes that rely upon changes in density and hydrogen index (HI). Various uses of NMR imaging in wells cased with non-metallic casing are also disclosed.
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Edwards John
Ladva Hemant K. J.
Arana Louis M
Echols Brigitte
Fonseca Darla
Rutherford Charlotte
Schlumberger Technology Corporation
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