Boart Longyear Co.

Andres MacLoughlin

Anthony Lachance

A system can comprise a drill string sub that is configured to couple to a drill rod of a drill string, wherein the drill string sub defines a shoulder and at least one through hole. A plug assembly can be receivable with a bore of the drill. The plug assembly can be releasably coupled to the drill string sub. When decoupled from the drill string, the plug assembly can be configured to be pumped into the drill string. The plug assembly can comprise a distal subassembly that defines a receiver that is configured engage a reverse circulation overshot. A proximal subassembly can be coupled to the distal subassembly. The proximal subassembly can comprise a brake apparatus that is configured to inhibit proximal movement of the plug assembly.

Growing community of inventors

Grange, Australia

Andres MacLoughlin