Abstract: Disclosed is an apparatus for cleaning the interior of elongated tubular objects such as pipes, tubes, etc., using a reciprocating lance having a cleaning fluid spray head at its end. Fluid pressure provides reciprocating movement to the lance. The cleaning fluid pressure is independent of the fluid which provides movement to the lance, thereby maintaining the desired fluid pressure to the nozzle through the complete cycle of reciprocation.

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.