G - Physics – 01 – N
Patent
G - Physics
01
N
358/4
G01N 23/222 (2006.01) E21B 47/10 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1290468
Abstract of the Disclosure A method for logging a cased well to determine the quantity and location of any barite weighted drilling fluid in the annulus between the casing and the wall of the wellbore. A tool assembly having a neutron generator and a gamma scintillation detector is used to log the zone of interest. The neutrons introduced into the well by the neutron generator convert a portion of the barium-138 in the drilling fluid to barium-137m. The magnitude of the gamma photon peak characteristic of the decay of barium-137 is used to identify the quantity of drilling fluid present in the annulus as a function of depth. This method is especially useful identifying the existence of channels in a cemented wellbore annulus.
551018
Haut Richard C.
Jordan Mark E.
Kline William E.
Borden Ladner Gervais Llp
Exxon Production Research Company
Haut Richard C.
Jordan Mark E.
Kline William E.
LandOfFree
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