String bypass

Details String bypass String bypass

1986-10-22

1988-06-07

Suchfield, George A.

Wells

Packers or plugs

With controllable passage between central conduit and space...

166131, 166319, E21B 2306, E21B 3406

Patent

active

047490373

ABSTRACT:
A string bypass for bypassing fluid around a packer as a testing string is lowered into or raised out of a well bore. The string bypass includes an outer case with an inner mandrel positioned therein such that an annular cavity is defined therebetween. A reciprocating piston is positioned in the annular cavity. The case and mandrel both define transverse holes therethrough, and the piston includes a transverse passageway which provides intercommunication between the holes when the piston is in an open position. A spring biases the piston toward the open position. A pump is used to inflate the packer, and, as the pump pressure gradually increases, a differential between the pump pressure and well annulus pressure acts against an annular area on the piston and overcomes the spring force so that the piston is moved to a sealed, closed position in which communication between the holes is prevented. The piston also includes a substantially longitudinal passageway therethrough which provides continuous fluid communication between the pump above the string bypass and the packer below the string bypass.

REFERENCES:
patent: 2775305 (1956-12-01), McKinley
patent: 3158200 (1964-11-01), Malone
patent: 3412799 (1968-11-01), Ellis
patent: 3439740 (1969-04-01), Conover
patent: 3876000 (1975-04-01), Nutter
patent: 3876003 (1975-04-01), Kisling, III
patent: 3926254 (1975-12-01), Evans et al.
patent: 4246964 (1981-01-01), Brandell
patent: 4320800 (1982-03-01), Upchurch
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patent: 4412584 (1983-11-01), Brandell
patent: 4457367 (1984-07-01), Brandell
patent: 4458752 (1984-07-01), Brandell
patent: 4580632 (1986-04-01), Reardon
Oilweek, Sep. 1, 1980, edition, p. 11--Northstar Drillstem Testers, Ltd.

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