Wells – Processes – With indicating – testing – measuring or locating
Patent
1976-06-02
1977-08-23
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166290, E21B 3313, E21B 4704
Patent
active
040433943
ABSTRACT:
In order to plug off potential producing zones in an abandoned well, cement is injected at the appropriate level in an amount estimated to be sufficient to seal off the zone. A selected portion of the cement, treated with a radioactive tracer, is injected to provide a layer of treated cement at the top of the wet cement plug and a probe or logging tool is thereafter used to locate the position of the top of the plug with the probe output being recorded graphically to provide a record of the position of the plug top.
REFERENCES:
patent: 2171840 (1939-09-01), Armentrout et al.
patent: 2217708 (1940-10-01), Scaramucci
patent: 2220205 (1940-11-01), Buckley
patent: 2308176 (1943-01-01), Howell
patent: 2320892 (1943-06-01), Scherbatskoy et al.
patent: 2398324 (1946-04-01), Pontecorvo
patent: 3097699 (1963-07-01), Orr
patent: 3474866 (1969-10-01), Dellinger et al.
patent: 3489219 (1970-01-01), Higgins
Howell et al., "Detection of Radioactive Cement in Cased Wells", AIMME, Tech. Pub. No. 1113, Galveston, Tex. Meeting, Oct. 1939, pp. 1-8.
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