Wells – Packers or plugs – Spaced sealing portions
Patent
1976-03-15
1977-06-21
Novosad, Stephen J.
Wells
Packers or plugs
Spaced sealing portions
166187, 166312, E21B 33124, E21B 33127, E21B 4325
Patent
active
040305457
ABSTRACT:
First, a cleansing fluid is injected under high pressure into a well liner and out through the apertures in the liner so as to travel through a particular slice of the underground formation adjacent the lining in order to dissolve chemical deposits and dislodge physical obstructions. Then, an entraining fluid is injected into the well liner under high pressure and into the formation in order to entrain the dissolved or dislodged particles in the formation and carry them into the well. Next, the captured particles are pumped out of the well to the surface for eventual disposal. The cleansing and entraining fluids are injected into a flexible hose which is connected to a high pressure source. The hose is surrounded by a pipe which carries the particles flushed from the underground formation to the surface. The pipe is surrounded by a series of packers which are inflated by the injected fluids. Outlet ports for the injected fluids are positioned between -- in vertically descending order -- first and second packers and between third and fouth packers; an inlet port for the entrained fluid is positioned between the second and third packers. In another embodiment the pipe is formed in sections, each section having ends which terminate in the vicinity of the terminal ends of the respective packer which surrounds it. The packers are formed with flexible walls which extend over the space between adjacent packers defining flexible joints so that the adjacent pipe sections are articulated.
REFERENCES:
patent: 2221775 (1940-11-01), Boynton
patent: 2290141 (1942-07-01), Burt
patent: 2675876 (1954-04-01), Conrad et al.
patent: 2824612 (1958-02-01), Lynes
patent: 2893493 (1959-07-01), Copas
patent: 3247904 (1966-04-01), Wakefield, Jr.
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