Sensor in bit for measuring formation properties while drilling

Details Sensor in bit for measuring formation properties while drilling Sensor in bit for measuring formation properties while drilling

1995-07-17

2000-11-21

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 330, G01V 504

Patent

active

061508225

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.

REFERENCES:
patent: 2310611 (1943-02-01), Blondeau
patent: 2354887 (1944-08-01), Silverman et al.
patent: 2917704 (1959-12-01), Arps
patent: 3293542 (1966-12-01), Piety
patent: 3412321 (1968-11-01), Unterberger et al.
patent: 4893084 (1990-01-01), Rau
patent: 4940943 (1990-07-01), Bartel et al.

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