Drilling apparatus and method
AssigneeBoard of Regents of the Nevada System of Higher Education
InventorGeorge L. Danko
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a drilling method and drill. According to a disclosed method, multiple reciprocating rock-breaking elements, including a hammer drill bit, are used. The elements are moved in alternation to each other such that the net volume displacement by the moving parts is reduced for reducing compression work and thus for losing useful energy from the available amount from the drill bit engine for rock breaking. If desired, a small component of the net volume displacement is kept for enhancing PVW for enhancing rock chipping by tensile strength. The method also includes synchronizing the peak of the pressure depression wave with that of the impact moment of the drill bit's reciprocating motion to enhance, rather than hamper, rock breaking by the creation of PVW.
Claims1
A drilling method comprising:
- using a plurality of reciprocating rock-breaking elements in the drillhole including a hammer drill bit;
- moving the elements in alternation to each other such that the net volume displacement by the moving parts in the drillhole, ΔV, is reduced for reducing compression work and thus for losing useful energy from the available amount from the drill engine for rock breaking;
- but if desired, keep a small component of ΔV for creating PVW for enhancing rock chipping by tensile stress;
- and
- synchronizing the peak of the pressure depression wave with that of the impact moment of the drill bit's reciprocating motion to enhance, instead of hamper, rock breaking by the creation of PVW.
Dependencies are inferred from the claim text.