Pipe joints or couplings – Frangible element
Patent
1976-10-12
1978-05-16
Cherry, Johnny D.
Pipe joints or couplings
Frangible element
285 2, 166237, 285 18, 285315, E21B 2300, F16L 3722
Patent
active
040895483
ABSTRACT:
The invention is an elongated tool for detachably connecting a sand screen and liner assembly to a tubing string. The tool comprises a releasing housing sleeve, a hookup nipple section which partly telescopes within the releasing housing sleeve with the telescoped end closed by a removable hookup nipple plug. A movable hollow piston having a ball valve seat at one end and a cross bore extending through its other end part fits within the other end of the releasing housing sleeve with the cross bore aligned with longitudinally extending slots in the releasing housing sleeve.
The hookup nipple has circumferentially extending grooves near its upper end which each mate with an array of bores extending through the releasing housing sleeve. Ball detent elements are disposed in the bores and grooves.
When a ball dropped from above seats on the piston valve seat, pressure is applied through the tubing to force the piston downwardly (after breaking a shear pin), dropping a retainer sleeve having an array of slots near its lower end to uncover the arrays of bores and permitting the ball detent elements to fall out. The releasing housing sleeve is thus disconnected from the hookup nipple with the hookup nipple in place.
REFERENCES:
patent: 2315931 (1943-04-01), Burt et al.
patent: 2409811 (1946-10-01), Taylor et al.
patent: 2776015 (1957-01-01), Bielstein
patent: 2978032 (1961-04-01), Hanna
Ayers Earl D.
Cherry Johnny D.
Lilly Merton B.
The Dow Chemical Company
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