Patent ID: 7306038

Claim:
Well cleaning apparatus for a liquid well having a casing comprising: first and second subassemblies, each said subassembly comprising: an elongated tube of substantially uniform cross section containing combustible material having a deflagration rate many times greater than the velocity of sound in the liquid of the well; means for igniting said combustible material to achieve deflagration of said material that progresses along the length of said tube and generates outwardly directed pressure; a plurality of short high strength sleeves mutually spaced by distances many times greater than the length of said sleeves secured to the exterior of said tube for attenuating said outwardly directed pressure at short areas spaced along the length of said tube by relatively long distances; a dampening element positioned between and in axial alignment with said first and second subassemblies; and means for holding said tube in the casing of the well.