Methods and apparatus for removing debris from a well bore

Details Methods and apparatus for removing debris from a well bore Methods and apparatus for removing debris from a well bore

1992-03-12

1993-10-12

Melius, Terry Lee

Wells

Processes

Cleaning or unloading well

166 99, 175 20, 175323, E21B 1044, E21B 3700

Patent

active

052517012

ABSTRACT:
A well clean-out tool includes a cylindrical member in which a helical conveyor screw is arranged for vertical sliding movement relative to the cylindrical member. The tool is lowered into a well bore until the shoe contacts debris within the bore. At that time, the screw is caused to descend relative to the cylindrical member, whereupon a lower end of the screw projects slightly below a lower end of the cylindrical member, and a rotary coupling between the screw and the cylindrical member is released, and a spring is caused to store energy. Thereafter, the screw is rotated relative to the cylindrical member, while the spring presses the cylindrical member against the debris in order to resist rotation of the cylindrical member. The screw projects only slightly downwardly beyond the lower end of the cylindrical member, e.g., less than one inch, in order to convey debris upwardly within the cylindrical member. At the end of a clean-out operation, the screw is raised back into the cylindrical member whereupon the rotary coupling is re-engaged in order to produce rotation of the cylindrical member as the tool is removed from the well bore.

REFERENCES:
patent: 3422913 (1969-01-01), Young, Jr.
patent: 3690388 (1972-09-01), Hilton et al.
patent: 4275926 (1981-06-01), Hodges

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