G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/14 (2006.01) G01R 33/44 (2006.01) G01V 3/32 (2006.01)
Patent
CA 2272968
The present invention provides methods for determining the bound fluid volume (BFV) of a formation utilizing nuclear magnetic resonance (NMR) techniques in which less than full polarization occurs and in which less than a complete NMR distribution is acquired. The effect of the polarizing static magnetic field is shortened in time by applying a shortened wait time between NMR measurements so that only the bound fluid of the formation is polarized. The shortened wait time is effectuated by early application of the oscillating magnetic field to the formation which, in conjunction with a limited number of refocusing pulses, induces signals in the formation that are measured by the NMR tool. The peak amplitude of these signals corresponds to the BFV. By only polarizing the bound fluid of the formation and only requiring a limited number of refocusing pulses, the NMR methods of the present invention are capable of providing BFV at high logging speeds such as those in excess of 1,800 feet per hour without a substantial degradation of vertical response. The present invention provides information so that a partial polarization calculation curve in T, lies almost equally between an empirical tapered cutoff curve and a theoretical tapered cutoff curve. Moreover, because no T, information must be acquired, the method is especially suited for logging-while-drilling operations, where the drill string moves uncontrollably during the NMR measurement.
Crary Steven F.
Flaum Charles
Kleinberg Robert L.
Speier Peter
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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