Apparatus and system for well placement and reservoir characterization

A modular downhole apparatus to determine a formation property, the apparatus being incorporated into a drill string comprising one or more downhole tools and drill pipe, the drill pipe being of the same or various lengths, the modular downhole apparatus comprising:

• a first module comprising a first drill collar having one or more antennas mounted thereon or therein, wherein the first module has connectors on both ends and is removeably connected to the drill string;
• and
• a second module comprising a second drill collar having one or more antennas mounted thereon or therein, wherein the second module has connectors on both ends and is removeably connected to the drill string;
• wherein a first dipole moment of one of the one or more antennas of the first module intersects a first module longitudinal axis at a first angle;
• wherein a second dipole moment of one of the one or more antennas of the second module intersects a second module longitudinal axis at a second angle;
• and
• wherein the first and second angles are unequal.

A method to determine a formation property, the method comprising:

• providing a modular apparatus incorporated into a drill string comprising one or more downhole tools and drill pipe, the drill pipe being of the same or various lengths;
• the modular apparatus comprising a first module comprising a first drill collar having one or more antennas mounted thereon or therein, wherein the first module has connectors on both ends and is removeably connected to the drill string;
• a second module comprising a second drill collar having one or more antennas mounted thereon or therein, wherein the second module has connectors on both ends and is removeably connected to the drill string;
• wherein a first dipole moment of one of the one or more antennas of the first module intersects a first module longitudinal axis at a first angle;
• a second dipole moment of one of the one or more antennas of the second module intersects a second module longitudinal axis at a second angle;
• and the first and second angles are equal;
• using the first and second modules to make measurements;
• and
• using the measurements to determine the formation property.

A method to determine a formation property, the method comprising:

• providing a modular apparatus incorporated into a drill string comprising one or more downhole tools and drill pipe, the drill pipe being of the same or various lengths;
• the modular apparatus comprising a first module comprising a first drill collar having one or more antennas mounted thereon or therein, wherein the first module has connectors on both ends and is removeably connected to the drill string;
• a second module comprising a second drill collar having one or more antennas mounted thereon or therein, wherein the second module has connectors on both ends and is removeably connected to the drill string;
• wherein a first dipole moment of one of the one or more antennas of the first module intersects a first module longitudinal axis at a first angle;
• a second dipole moment of one of the one or more antennas of the second module intersects a second module longitudinal axis at a second angle;
• and the first and second angles are unequal;
• using the first and second modules to make measurements;
• and
• using the measurements to determine the formation property.