Abstract: Embodiments of a reamer of the present invention generally include a body, one or more attachment members, one or more sub-body members that are reversibly attachable to the attachment members and contain one or more blades containing cutting elements, one or more nozzles, each disposed on the collar (tubular section) proximate a portion of the cutting structure, such that fluid flowing through a nozzle is directed tangentially along a series of cutting elements disposed along the cutting structure. Additional embodiments include sub-body members and/or attachment members that facilitate bi-directional excavation and/or rotational operation of the reamer. Embodiments of methods of using apparatuses of the present invention are also provided.

Abstract: Embodiments of a reamer of the present invention generally include a front end containing components, such as pie wedge-shaped corebuster components, that are substantially axially disposed with respect to the axis of rotation of the reamer, wherein the pie wedges include abrasion-resistant inserts, which may be cylindrical in shape, oriented substantially longitudinally with respect to the axis of rotation of the reamer. Embodiments of a method of using an apparatus of the present invention are also provided.