Well cleanout tool and method

Details Well cleanout tool and method Well cleanout tool and method

1991-06-11

1992-08-18

Novosad, Stephen J.

Wells

Processes

Cleaning or unloading well

1661053, 1661054, 166107, 166325, 175308, E21B 2110, E21B 3700

Patent

active

051390892

ABSTRACT:
A cleanout tool for removing debris from a deep borehole, the borehole being characterized by having a relatively low hydrostatic head or level of liquid in the borehole. A series of unique check valves acting in cooperation with a pumping section are used to collect the debris into the debris reservoirs while passing the liquid upwardly through the cleanout tool. The check valves are unique in the fact that they are less prone to plugging and two sets are supplied in pairs so as to provide an extra margin of valving efficiency. The cleanout tool is operable in under low hydrostatic head conditions due to its improved pumping efficiency.

REFERENCES:
patent: 4190113 (1980-02-01), Harrison
patent: 4421182 (1983-12-01), Moody et al.
patent: 4478285 (1984-10-01), Caldwell
patent: 4711299 (1987-12-01), Caldwell et al.
patent: 4721156 (1988-01-01), Campbell
patent: 4924940 (1990-05-01), Burroughs et al.
patent: 4940092 (1990-07-01), Ferguson et al.

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