Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1994-09-16
1996-07-23
Willis, Davis L.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502695, G01V 510
Patent
active
055392253
ABSTRACT:
Measurement-while-drilling apparatus includes a 14 MeV neutron accelerator, a near-spaced neutron detector which primarily senses source neutrons and whose output is proportional to source strength, one or more intermediately-spaced epithermal neutron detectors eccentered against the drill collar wall and primarily responsive to formation hydrogen concentration, and a third far-spaced radiation detector, either gamma ray or neutron, primarily responsive to formation density. The intermediately-spaced and far-spaced detector outputs, normalized by the near-spaced detector output, are combined to provide measurements of porosity, density and lithology and to detect gas. A thermal neutron detector and/or a gamma ray detector may also be provided at intermediate spacings to provide additional information of interest, such as standoff measurements and spectral analysis of formation composition. Tool outputs are related to the angular or azimuthal orientation of the measurement apparatus in the borehole.
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Albats Paul
Chowdhuri S. Zema
Couet Benoit
Evans Michael L.
Holenka Jacques M.
Berkley Richard G.
Hanig Richard
Hyden Martin D.
Pojunas Leonard W.
Schlumberger Technology Corporation
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