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:
Feb. 18, 2003
Filed:
Mar. 20, 2000
Martin D. Hurlimann, Ridgefield, CT (US);
Pabitra N. Sen, Ridgefield, CT (US);
William E. Kenyon, Ridgefield, CT (US);
Schlumberger Technology Corporation, Ridgefield, CT (US);
Abstract
A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is moveable through the borehole; (b) producing, from the logging device, a static magnetic field in the formations; (c) transmitting, into the formations, from the logging device, a magnetic pulse sequence and receiving, during the pulse sequence, magnetic resonance spin echo signals; the magnetic pulse sequence having a portion of a pulse acquisition sequence with relatively long pulse spacing times t and another portion of the pulse acquisition sequence with relatively short pulse spacing times t ; and (d) repeating step (c) with pulse spacing times t that are different than t ;(e) deriving respective T distributions from the spin echo signals obtained during the another portion of the pulse acquisition sequence of step (c) and during the another portion of the pulse acquisition sequence of step (d); and (f) determining the characteristic of the formations from the respective T distributions.