Patent ID: 6297639
Filing Date: 2001-10-02
Classification: G01V

Abstract:
A directional logging apparatus for measuring characteristics of earth formations surrounding a borehole, comprising:a longitudinal support means having two ends and adapted to be moveable through the borehole;at least one transmitting coil and at least one receiving coil mounted on the support means, each coil respectively adapted to transmit or receive electromagnetic energy having azimuthal, axial, or radial field components; andat least one transmitting coil or at least one receiving coil being surrounded by a shield, the shield having at least one sloped slot or sloped conductive element therein, each at least one sloped slot or sloped conductive element being sloped at an angle with respect to the longitudinal axis of the support means to provide selective attenuation of at least one of the electromagnetic energy field components as the component interacts with the shield;whereby the formation characteristics are measured in a focused direction due to the placement of the shield on the at least one transmitting or receiving coil.