Method and apparatus for detecting while drilling...

Details Method and apparatus for detecting while drilling... Method and apparatus for detecting while drilling...

2004-03-03

2008-10-07

Porta, David P. (Department: 2884)

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

C250S260000

Reexamination Certificate

active

07432499

ABSTRACT:
The invention relates to methods and apparatus for determining a downhole parameter in an underbalanced drilling environment which include: selectively activating a first fluid flowing from the formation through a wellbore while under balanced drilled; detecting the activated first fluid; and determining a depth at which said fluid enters the wellbore.

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Albertin I et al: “The Many Facets of Pulsed Neutron Cased-Hole Logging” Oilfield Review, Elsevier, Amsterdam, NL, vol. 8, N.R.2 pp. 28-41 XP008013790 ISSN: 0923-01730 p. 39-40.

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