Sensor in bit for measuring formation properties while drilling
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United States of America Patent
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Nov 21, 2000
Grant Date -
N/A
app pub date -
Jul 17, 1995
filing date -
Jan 21, 1994
priority date (Note) -
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Abstract
Earth formation evaluation for detection of hydrocarbon fluids is carried out by a microwave frequency range sensor (antenna or wave guide) disposed in the face of a diamond or PDC drill bit configured to minimize invasion of drilling fluid into the formation ahead of the bit. The sensor is connected to an instrument disposed in a sub interposed in the drill stem for generating and measuring the alteration of microwave energy. In particular, the dielectric constant of the earth formation in a zone which is substantially uninvaded by drilling fluid may be detected and compared with density and/or porosity logs to determine the presence of hydrocarbons in relatively thin layers of formation material.
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