Electricity: measuring and testing – Particle precession resonance – Using well logging device
Reexamination Certificate
2005-12-06
2005-12-06
Arana, Louis (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using well logging device
C324S306000
Reexamination Certificate
active
06972564
ABSTRACT:
An objective oriented NMR logging method selects pulse sequences over a plurality of frequencies from a set of building blocks. The building blocks include trainlet sequences wherein each trainlet comprises an excitation pulse and a plurality of refocusing pulses, the total length of a trainlet being typically less than 10 ms. Another building block is a short CPMG or modified CPMG sequence and yet another building block is a regular CPMG or modified CPMG sequence. The modified CPMG sequences may have refocusing pulses with a tipping angle less than 180° to reduce the power consumption. Based on the logging objective (formation evaluation or FE, FE plus hydrocarbon typing, FE plus gas evaluation) the building blocks are combined at a plurality of frequencies with different wait times and TEs.
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Chen Songhua
Edwards Carl M.
Arana Louis
Baker Hughes Incorporated
Madan Mossman & Sriram P.C.
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