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:
Jun. 25, 1991
Filed:
Feb. 22, 1990
Patricia K Hunt, Solon, OH (US);
Bernard Zemel, Shaker Heights, OH (US);
BP America Inc., Cleveland, OH (US);
Abstract
A method of determining the invasion of drilling mud filtrate into a core sample from a borehole in a subterranean rock formation, comprising using a drilling mud which forms a filter cake during coring of the borehole thereby to limit invasion of drilling mud solids into the subterranean rock to an extent less than invasion of the base fluid in which the mud solids otherwise are normally suspended, dissolving a dopant in the base fluid of the drilling mud to form a solution having an X-ray attenuation characteristic different from the X-ray attenuation characteristic of the connate fluids in the subterranean formation, obtaining a core sample from the borehole using the doped drilling mud with the dopant remaining in solution in the base fluid under subterranean conditions at the core sample depth, scanning the core sample with a computed tomography scanner to determine the attenuation characteristics at a plurality of points in a cross-section in the core sample, and determining from the attenuation characteristics for the plurality of points the depth of invasion of the dopant-base fluid solution into the core sample.