Patent ID: 9187958
Filing Date: 2015-11-17
Classification: E21B

Abstract:
1. A reamer configured for use in forming a hole for the extraction of hydrocarbon materials, the reamer comprising: a first reamer block that is extendible from and retractable toward a rotational axis that runs longitudinally through the reamer; a second reamer block that is extendible from and retractable toward the rotational axis; and multiple cutters carried on the first reamer block and the second reamer block, the cutters being disposed in multiple rows of cutters that run generally longitudinally along external surfaces of the first and second reamer blocks, wherein the rows include a leading row of cutters carried on the first reamer block, the leading row on the first reamer block including a first cutter, and wherein the rows further include a trailing row of cutters carried on the first reamer block or the second reamer block that trails the leading row and includes a second cutter, wherein the first cutter and the second cutter are disposed in the same section of the profile of the reamer, and wherein an aspect of the geometrical cross-sectional shape of the first cutter is different from the second cutter, wherein the first cutter and the second cutter are both non-circular ellipses, and wherein eccentricity is different between the first cutter and the second cutter.