Patent ID: 8887810
Filing Date: 2014-11-18
Classification: E21B

Abstract:
1. An array of loop antennas for heating a subsurface formation comprising: a first loop antenna positioned within the subsurface formation, the first loop antenna configured as a polygonal loop and lying approximately within a first plane, with the polygonal loop having a center and a plurality of vertices so that a distance therebetween is r; a first RF source above the subsurface formation and configured to provide RF energy to said first loop antenna; a second loop antenna positioned within the subsurface formation, the second loop antenna configured as a polygonal loop that is separate from and not connected to the first antenna and lying approximately within a second plane, with the polygonal loop having a center and a plurality of vertices so that a distance therebetween is r, with the second plane being generally parallel to the first plane and separated from the first plane by the distance r; and a second RF source above the subsurface formation and configured to provide RF energy to said second loop antenna.