Well clean out tool

Details Well clean out tool Well clean out tool

E - Fixed Constructions

21

B

166/53

E21B 37/00 (2006.01) E21B 27/00 (2006.01)

Patent

CA 1208543

ABSTRACT OF THE DISCLOSURE The present invention relates to a well clean out tool comprising an elongated body having first and second ends and being adapted to be received within a well borehole. The elon- gated body is comprised of a plurality of subs including a first sub at a lower portion of the body having a one way valve for permitting only upward flow of fluid. A second sub is arranged above the first sub for receiving and retaining fluid and debris passing through the first sub while a third sub is arranged above the second sub. The third sub includes a second valve for permitting flow only upwardly through the third sub. A fourth or pumping sub is arranged above the third sub with the fourth sub including an outlet for returning fluid to the borehole. The pump sub includes an elongated hollow piston recipricatingly driven within a casing of the fourth sub. During the upstroke of the piston, fluid and debris pass upwardly through the first second and third subs while during downward movement of the piston fluid is prevented from flowing downwardly by the valves and flows upwardly through a valve in the hollow piston toward the outlet of the tool.

452892

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