Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1984-11-07
1986-03-04
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166330, 166178, 175306, E21B 3414, E21B 2110
Patent
active
045735360
ABSTRACT:
A method and apparatus for flushing a well involves the use of a tool which enables a certain jarring displacement to cause a flush valve to be opened. Rotary oscillation of a stem in a given direction may be converted by a ratchet mechanism into rotation of a sleeve in the same direction. The stem may oscillate in either of two rotary directions but rotation in only one direction is transferred to the sleeve. In addition, the ratchet mechanism may be arranged so that rotation of the stem by a given amount results in rotation of the sleeve by a lesser amount. The rotation of the sleeve may be converted into a reciprocating motion of a valve portion through a cam-like engagement between the sleeve and the valve portion. The valve portion includes a port which is capable of communicating with a port in the barrel in response to a predetermined extent of displacement along the longitudinal axis of a drill string. Thus, the ratchet mechanism may be arranged so that a given number of rotary movements of the stem are required in order to achieve communication between the ports in the barrel and the valve portion. The stem may be connected to a jar mechanism, advantageously a rotary mechanical jar, so that jarring and flushing actuations may be interrelated. The arrangement of the flush valve and its operating structure enables continuous communication through the region of the drill string bore proximate to the flush valve and the ratchet mechanism, regardless of the state of the valve.
REFERENCES:
patent: 2815925 (1957-12-01), Fisher, Jr.
patent: 3208541 (1965-09-01), Lawrence
patent: 3209834 (1965-10-01), Essary
patent: 3233690 (1966-02-01), Lawrence
patent: 3735827 (1973-05-01), Berryman
patent: 4059167 (1977-11-01), Berrymann
patent: 4161224 (1979-07-01), Hostrup
patent: 4162691 (1979-07-01), Perkins
patent: 4460041 (1984-07-01), Berrymann
Bagnell David J.
Dailey Petroleum Services Corporation
Novosad Stephen J.
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