Wells – Processes – Cleaning or unloading well
Patent
1980-01-25
1981-05-05
Leppink, James A.
Wells
Processes
Cleaning or unloading well
166 68, E21B 3700, E21B 4300
Patent
active
042653126
ABSTRACT:
A method and apparatus for removing particulate matter from the bottom of a drilled water well having a casing (10) open at its top. A pair of tubes (15 and 16) are lowered into the casing, the former outside the latter, so that their lower ends extend below the level of water in the well, the outer tube extending below the inner tube, to define a primary upward discharge path (31) and a secondary upward discharge path (143). Air is supplied (121, 122) to the top of the inner tube at such a pressure as to cause a primary discharge of fluid upward through the primary discharge path by air-lift operation. Valve means (140) is provided for intermittently first closing the primary discharge path, near the top of the outer tube, and afterwards suddenly reopening the primary discharge path to enable rapid gravitational return of water in the secondary discharge path and reestablish the primary discharge.
REFERENCES:
patent: 746980 (1903-12-01), Moran et al.
patent: 1153253 (1915-09-01), Purdy
patent: 1547197 (1925-07-01), Arbon
patent: 1798774 (1931-03-01), Yates
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patent: 2713908 (1955-07-01), Curtis
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patent: 2942663 (1960-06-01), Haggard
patent: 4223724 (1980-09-01), Levoni et al.
Ground Water and Wells, pp. 303-305, 388, 389.
Water Well Handbook, p. 121.
Leppink James A.
Suchfield George A.
Thein Well Company, Incorporated
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