RESISTIVITY TOOLS WITH LOAD-BEARING SEGMENTED AZIMUTHALLY SENSITIVE ANTENNAS AND METHODS OF MAKING SAME

摘要

The disclosure provides apparatus and method for estimating one or more electrical properties downhole. The apparatus includes a metallic member that has a longitudinal axis and a radial axis, at least two groups of slots formed in the metallic member, each group of slots having at lest two rows of slots, each row of slots containing at least one slot, and an electrical conductor placed over the rows of slots at an angle to the radial axis of the metallic member to form an antenna of a tool for use in a wellbore for estimating the electrical properties downhole. The antenna may be configured to operate as a transmitter or as a receiver.