Wells – Packers or plugs – Expanded by confined fluid from central chamber – pump or...
Patent
1995-02-06
1996-06-18
Tsay, Frank S.
Wells
Packers or plugs
Expanded by confined fluid from central chamber, pump or...
166319, E21B 3312, E21B 3313
Patent
active
055268781
ABSTRACT:
A stage cementer with integral inflation packer. The apparatus comprises a mandrel with an external closing sleeve and an operating sleeve interlocked therewith. Below the operating sleeve is an opening sleeve. The opening sleeve is mechanically actuated by a pump-down plug to actuate the opening sleeve and thereby to allow inflation of a packer portion disposed around said mandrel. An anchor ring is disposed in said mandrel and engaged therewith by a retainer ring. The anchor ring limits movement of the opening sleeve, and a shallow portion of a groove prevents radially inward movement of the retainer ring so that the anchor ring remains lockingly engaged with the mandrel. A back check valve prevents the packer from deflating. When the packer portion is inflated, a packer shoe slidably moves about an outer surface of the closure sleeve. After the packer portion is inflated, additional pressure is applied which ruptures a rupture disc to open a port to the well annulus above the packer portion. Cementing may be carried out through this port, and after the cementing operation, a plug engages the operating sleeve to move the operating sleeve and the external closure sleeve, thereby closing the cementing port.
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Duell Alan B.
Szarka David D.
Christian Stephen R.
Halliburton Company
Kennedy Neal R.
Roddy Craig W.
Tsay Frank S.
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