Patent ID: 6957708

Claim:
A measurement-while-drilling (MWD) apparatus conveyed within a borehole for determining electrical properties of a formation surrounding said borehole, said MWD device comprising: (a) a rotatable drill collar; (b) at least one stabilizer coupled to said collar and rotating at the same speed as said drill collar; (c) a hardfacing on outer face of said at least one stabilizer to maintain a desired standoff from the borehole wall; (d) at least one transmitter on the at least one stabilizer for conveying of at least one RF signal into said formation; and (e) at least one receiver on the at least one stabilizer, said at least one transmitter and said at least one receiver, for obtaining a resistivity image of the earth formation from a signal received at the at least one receiver resulting from interaction of the at least one RF signal with said formation.