Wells – Valves – closures or changeable restrictors
Patent
1975-10-24
1977-11-15
Purser, Ernest R.
Wells
Valves, closures or changeable restrictors
166224R, 251 58, E21B 4300
Patent
active
040581659
ABSTRACT:
A wellbore circulating valve especially useful in a string of testing tools utilizes a sequentially ratcheted inner mandrel which covers a series of flow ports and is opened by a predetermined sequence of operations which move the mandrel away from the flow ports thereby communicating the annulus with the inner bore of the tool.
REFERENCES:
patent: 2951536 (1960-09-01), Garrett
patent: 3132703 (1964-05-01), Larcen
patent: 3306366 (1967-02-01), Muse
patent: 3395758 (1968-08-01), Kelly et al.
patent: 3433301 (1969-03-01), McEver, Jr.
patent: 3572434 (1971-03-01), Ecuer
patent: 3583481 (1971-06-01), Vernotzy
patent: 3741305 (1973-06-01), Young
patent: 3805894 (1974-04-01), Giroux
Holden John C.
Wray Gary Q.
Cockfield James E.
Favreau Richard E.
Gonzalez Floyd A.
Halliburton Company
Purser Ernest R.
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