Wells – Processes – Cementing – plugging or consolidating
Patent
1982-12-27
1984-12-11
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166154, 166194, 166324, E21B 3313, E21B 3316
Patent
active
044872631
ABSTRACT:
A cement staging apparatus for wells and including well casing, comprising an open ended hollow body having a number of spaced ports therethrough; a first hollow member slideably associated with said body and having a first ports closed position and a second ports open position; first pressure associated with said first member for displacing said first member and opening said ports thereby; a second hollow member slideably associated with said body and having a first ports open position and a second ports closed position and including shifting pressure relieving means associated with said body; second pressure means associated with said second member for displacing said second member and closing said ports thereby; said second member spaced a distance from said first member; said body, said member and said first pressure means defining a canister having an open end for receipt of a supply of pressurized cement and adapted for distributing said cement through said ports; and said body, said first and said second pressure means and said second member defining a closed canister for preventing the distribution of an additional supply of cement whereby closing of said canister by said second pressure means causes said pressure relieving means to shift thereby and relieve said canister pressure.
REFERENCES:
patent: 2435016 (1948-01-01), Pitts
patent: 2488819 (1949-11-01), Larkin
patent: 3097698 (1963-07-01), Corley, Jr. et al.
patent: 3451476 (1969-06-01), Pitts
patent: 3789926 (1974-02-01), Henley et al.
patent: 3948322 (1976-04-01), Baker
patent: 4260017 (1981-04-01), Nelson et al.
"Multiple Stage Cementing uses 2 and 3-Stage Methods" by Montgomery, World oil, 12/1954.
Neuder William P.
Novosad Stephen J.
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