Wells – Valves – closures or changeable restrictors – Operated by dropped element
Patent
1998-03-13
2000-05-23
Bagnell, David
Wells
Valves, closures or changeable restrictors
Operated by dropped element
166317, 166320, 166312, 166222, 166223, E21B 2100
Patent
active
060655410
ABSTRACT:
A cleaning device for a well bore which is adapted to be connected to a drill string for insertion into the well bore and through which cleaning fluid is pumped, comprises an elongated outer sleeve having an axially extending through bore therein and at least one port in the side wall of the outer sleeve, each of which ports is axially spaced along the outer sleeve. An elongated inner sleeve having, an axially extending through bore therein is coaxial with and axially slidable within the outer sleeve. An annular seating collar is located within the through bore in the inner sleeve and at least one port is provided in the side of the inner sleeve. The ports are axially spaced along the inner sleeve. Pressure sensitive stops means serve to retain the inner sleeve in place within the outer sleeve at each of a plurality of predetermined axially spaced positions in turn. Means for obstructing the annular seating collar and each of the ports in the inner sleeve are dropped into the cleaning device one at a time such that, when cleaning fluid is first connected to the cleaning device it passes through the inner sleeve and with that insertion of the first and each subsequent obstructing means the inner sleeve is caused to move axially downwards relative to the inner sleeve onto each pressure sensitive stop means in turn and in each of these positions a port in the inner sleeve is radially aligned with a port in the outer sleeve.
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Bagnell David
EZI-Flow International Limited
Kang Chi H.
LandOfFree
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