Hydraulic jet drill stem and bit unplugging device

Abstract

A device for cleaning compacted clay, fine gravels, sand, and other blocking agents from the inside of drill stems or drill bits. The device cleans away the unwanted matter by use of concentrated streams of high pressure liquid traveling at very high velocity aimed at the unwanted matter so as to erode it away. The device has one compressed gas cylinder attached to a liquid reservoir through a pressure regulating valve so as to keep the liquid in the reservoir under a constant pressure. The liquid is emitted through a nozzle containing many small holes through a pressure actuated valve. This assembly is disposed within a casing which forms a part of the drill string with the drill bit at one end of the casing. The nozzle extends to within a short distance of the drill bit. When unwanted matter is caught in the drill bit the pressure within the drill string rises above the pressure necessary to actuate the pressure actuated valve which then releases the high pressure water through the nozzle to erode away the unwanted matter.

Dependencies are inferred from the claim text.