Semiotic Modeling for De-Duplication of Text Strings Using A Word-Stack Approach

A drilled well of deficient performance due to accumulation of scales on the water-intake parts of its well pipe is rejuvenated at low cost by inserting a cleaning pipe of smaller diameter through the well pipe to supply concurrently to the water-intake parts an aqueous solution of a harmless washing agent and high-pressure air, which produce a cooperatively combined agitation action by which the scales are chemically dissolved, loosened, and washed off and can be subsequently removed by pumping through the well pipe. The air and solution are delivered from respective supply pumps and supplied through a mixer to the cleaning pipe to be ejected with high energy through a vaned turbine wheel at the lower end of the cleaning pipe.