Method for controlling the set time of cement

Details Method for controlling the set time of cement Method for controlling the set time of cement

1995-06-02

1997-03-25

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

106720, 106725, 106726, 106727, 106803, 166292, 166300, E21B 3313, E21B 3314

Patent

active

056135580

ABSTRACT:
An oil and gas well cementing composition and method are shown utilizing hydraulic cement, water a cement hydration retarder and an additive which is effective over a selected time period to degrade the retarder. The additive is a controlled release oxidizer which releases nascent oxygen over time to gradually oxidize the cement hydration retarder, thereby providing a single cement slurry design for cementing pipes for oil and gas wells where wide temperature differentials exist between the two ends of the pipe.

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patent: 5327968 (1994-07-01), Onan et al.
patent: 5336316 (1994-08-01), Dawson et al.

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