Wells – Processes – Cleaning or unloading well
Patent
1981-03-16
1984-02-14
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
166386, 166184, 166191, 166332, E21B 3700
Patent
active
044310587
ABSTRACT:
The disclosure relates to an improved tool and method for effecting the washing of sand or particulates from casing perforations and channels in production formations in subterranean wells. The tool employed comprises an outer body suspended from a first tubing string and having vertically spaced seals in engagement with the casing wall above and below the set of casing perforations to be washed. Radial wash ports are provided in the outer body between the annular seals. An inner body, carried by a second tubing string is inserted within the first tubing string and outer body and effects a sealing engagement with the bore of the outer body at a location below the radial wash ports. Washing fluid is then introduced into the well through the annulus defined between the first and second tubing strings and the sand laden washing fluid is returned to the well surface through the bore of the inner body and the connected second tubing string.
REFERENCES:
patent: 2512801 (1950-06-01), Kinney et al.
patent: 2649916 (1953-08-01), Brown
patent: 2681705 (1954-06-01), Tappmeyer
patent: 3412805 (1968-11-01), Gribben et al.
patent: 3456724 (1969-07-01), Brown
patent: 4027732 (1977-06-01), Perkins
patent: 4279306 (1981-07-01), Weitz
patent: 4280561 (1981-07-01), Fredd
Salerni John V.
Spencer Jack D.
Baker International Corporation
Neuder William P.
Novosad Stephen J.
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