G - Physics – 01 – V
Patent
G - Physics
01
V
324/9
G01V 3/26 (2006.01) E21B 47/12 (2006.01) E21B 49/00 (2006.01) G01V 3/30 (2006.01)
Patent
CA 1110697
ABSTRACT OF THE DISCLOSURE The disclosure is directed to an apparatus and method for determining the water-filled porosity of formations surrounding a borehole by means of an electromagnetic propagation tool. In accordance with one embodiment, a transmitter emits microwave electromagnetic energy into a borehole which is received by two spaced apart receivers within the borehole. The received signals are utilized to obtain the attenuation and the relative phase shift of the microwave electromagnetic energy propagating between the spaced locations. The conductivity of the water in the formations surrounding the spaced locations is determined, for example, from the conductivity of the drilling mud being utilized and the nature of the mud filtrate resulting from invasion of the formations by the drilling mud. An indication of the water-filled porosity, ?w? of the formations adjacent the region of the spaced locations in the borehole is provided by a quantity which is directly proportional to the product of the attenuation and phase shift quantities and inversely proportional to the conductivity of the formation water.
303741
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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