| CPC E21B 17/14 (2013.01) [E21B 34/14 (2013.01)] | 17 Claims |
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1. A shoe for use with a casing or liner string, comprising:
a tubular body;
a nose: mounted to an end of the tubular body, and having: a chamber formed therein, a front port extending longitudinally from the chamber to an exterior of the nose, and a side port extending transversely from the chamber to the exterior of the nose; and
a valve repeatedly shiftable between a deployment position where the front port is open and the side port is closed and a cleaning position where the front port is closed and the side port is open and comprising a piston disposed in the chamber and movable between the positions,
wherein:
the valve is configured to shift to the deployment position in response to forward flow through the shoe being less than a threshold flow rate,
the valve is configured to shift to the cleaning position in response to the forward flow through the shoe being greater than the threshold flow rate,
the piston has a cap portion formed at an end thereof,
the cap portion has an aperture formed therein adjacent to a periphery thereof,
the piston covers an inlet of the side port in the deployment position, and
a solid portion of the cap portion covers an inlet of the front port in the cleaning position.
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