Blockless reamer
A blockless reamer drilling tool comprising an elongated tool body and a reamer unit. The reamer unit includes, a shaft having a first end and a second end and a cutter mounted on the shaft between the first and second ends. A pocket on the exterior surface of the tool body is sized to accept the reamer unit with a portion of the reamer unit recessed in the pocket. A plurality of pins engage the tool body and secure the reamer unit within the pocket. The plurality of pins includes a first pin engaging the tool body and passing through the shaft at the first end and a second pin engaging the tool body and passing through the shaft at the second end.
1. A reamer drilling tool comprising:
an elongated tool body including an exterior surface;
a reamer unit including a shaft having a first end and a second end and a cutter mounted on the shaft between said first and second ends;
a pocket on the exterior surface of the tool body sized to accept the reamer unit therein with a portion of the reamer unit recessed in the pocket;
and a plurality of pins engaging the tool body and securing the reamer unit within the pocket, the plurality of pins including a first pin engaging the tool body and passing through said shaft at said first end and a second pin engaging the tool body and passing through said shaft at said second end; and,
wherein said reamer drilling tool is blockless.
2. A reamer drilling tool according to claim 1 wherein the body has a fluid circulation bore therethrough.
3. A reamer drilling tool according to claim 1 wherein the end sections of the body are threaded whereby the body may be adjoined with tubular members of a drill string.
4. A reamer drilling tool according to claim 1 wherein the cutter is a substantially cylindrical roller mounted over said shaft, the roller being rotatable about the shaft.
5. A reamer drilling tool according to claim 4 wherein the shaft includes flattened side surfaces selected to correspond to the shape of the pocket.
6. A reamer drilling tool according to claim 1 wherein the pins are spring pins.
7. A reamer drilling tool according to claim 1 wherein the pocket is formed to provide for mounting the reamer unit with said shaft extending in an axial direction with respect to the body.
8. A reamer drilling tool according to claim 1 wherein the pocket is formed to provide for mounting the reamer unit with said shaft extending in a slanted direction with respect to the longitudinal axis of said tool body.
9. A reamer drilling tool according to claim 1 including a plurality of pockets spaced circumferentially about the body, each with a reamer unit mounted therein.
10. A reamer drilling tool according to claim 1 including a plurality of pockets spaced axially along the body, each with a reamer unit mounted therein.