Method and apparatus for determining true formation porosity fro

Details Method and apparatus for determining true formation porosity fro Method and apparatus for determining true formation porosity fro

1988-06-21

1989-03-07

Behrend, Harvey F.

Induced nuclear reactions: processes, systems, and elements

Nuclear transmutation

By neutron bombardment

376165, 250254, 250256, G01V 500

Patent

active

048104590

ABSTRACT:
A method and apparatus for determining true formation porosity utilize downhole measurement-while-drilling neutron porosity measurement devices. A initial measurement is taken shortly after the formation is bored and before any substantial invasion by the drilling fluid occurs. Subsequent measurements are made until a steady, no longer increasing, measurement is reached indicating saturation of the formation by the drilling fluid to the depth of the measurements. The steady measurement is indicative of the true porosity of a gas containing formation while the difference between the initial and steady measurements is indicative of the gas saturation of a gas containing formation.

REFERENCES:
patent: 2936375 (1960-05-01), McKay
patent: 3908122 (1975-09-01), Hartsell
patent: 3993903 (1976-11-01), Neuman
patent: 4002903 (1977-01-01), Pitts, Jr. et al.
patent: 4005290 (1977-01-01), Allen
patent: 4550392 (1985-10-01), Memby
patent: 4577102 (1986-03-01), Sherman et al.

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