Carbonaceous extenders for flexible cement

Details Carbonaceous extenders for flexible cement Carbonaceous extenders for flexible cement

2008-04-07

2010-11-23

Bates, Zakiya W. (Department: 3676)

Wells

Processes

Cementing, plugging or consolidating

C106S668000, C106S716000

Reexamination Certificate

active

07836953

ABSTRACT:
A flexible cement stable at high temperatures contains an extender that is a finely ground bituminous coal and/or a finely ground coke prepared from coal and/or liquid hydrocarbons. Preferred cokes are made from bituminous coals and from petroleum, heavy oil, and oil from tar sands, oil shales or oil sands. The coke is present in an amount up to 100 percent by weight of cement and the particle size is preferably from 1 to 1000 microns. The coke is also effective as an extender, and the slurries and set cements have low specific gravity.

REFERENCES:
patent: 3376146 (1968-04-01), Mitchell
patent: 4043828 (1977-08-01), Gaines
patent: 4957555 (1990-09-01), Wheeler et al.
patent: 2008/0196628 (2008-08-01), Santra et al.
Stiles D. and Hollies D.: “Implementation of Advanced Cementing Techniques to Improve Zonal Isolation in Steam Assisted Gravity Drainage Wells”, SPE/CIM Canadian Heavy Oil Association (CHOA) 78950 presented at the Heavy Oil Symposium and International Well Technology Conference, Calgary, Alberta, Canada (Nov. 4-7, 2002).

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