NMR flow measurement while drilling

Details NMR flow measurement while drilling NMR flow measurement while drilling

2005-05-24

2005-05-24

Shrivastav, Brij B. (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

C324S300000

Reexamination Certificate

active

06897652

ABSTRACT:
A method for measuring in situ formation fluid flow utilizing an NMR logging while drilling tool is disposed in the borehole, a modified saturation recovery or time of flight angiography pulse sequence is utilized to tag spins in the formation, at least two measurements are made of the tagged spins as they propagate toward the borehole in the under-balanced environment, allowing a determination of fluid velocity, from which permeability may be determined. Techniques are disclosed to perform the method in both an over-balanced and under-balanced environment.

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Merboldt, K., et al., Flow NMR Imaging Using Stimulated Echoes, Journal of Magnetic Resonance, vol. 67, pp. 336-341 (1986).

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