X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1990-02-22
1991-06-25
Westin, Edward P .
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 45, 378 51, 378 88, 250255, 250259, 175 42, A61B 680, G01N 23223, C09K 700
Patent
active
050273795
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.
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Hunt Patricia K.
Zemel Bernard
BP America Inc.
Westin Edward P .
Wong Don
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