The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 1996
Filed:
Sep. 16, 1994
William A Loomis, Ridgefield, CT (US);
Kenneth E Stephenson, Newtown, CT (US);
Jerome A Truax, Brookfield, CT (US);
Wolfgang P Ziegler, Ridgefield, CT (US);
S Zema Chowdhuri, Bloomington, IN (US);
Benoit Couet, Bethel, CT (US);
Michael L Evans, Missouri City, TX (US);
Paul Albats, Ridgefield, CT (US);
Bradley A Roscoe, Ridgefield, CT (US);
Jacques M Holenka, Missouri City, TX (US);
Keith A Moriarty, Houston, TX (US);
William R Sloan, Missouri City, TX (US);
Schlumberger Technology Corporation, Ridgefield, CT (US);
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.