Well cementing in permafrost

Details Well cementing in permafrost Well cementing in permafrost

1979-01-31

1980-01-01

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

106 90, C04B 732

Patent

active

041815335

ABSTRACT:
A process for cementing a string of pipe in the permafrost region of a borehole of a well wherein aqueous drilling fluid actually used in drilling the wellbore in the permafrost region of a wellbore is employed. The drilling fluid contains or is adjusted to contain from about 2 to about 16 volume percent solids. Mixing with the drilling fluid (1) an additive selected from the group consisting of ligno-sulfonate, lignite, tannin, and mixtures thereof, (2) sufficient base to raise the pH of the drilling fluid into the range of from about 9 to about 12, and (3) cementitious material which will harden in from about 30 to about 40 hours at 40.degree. F. The resulting mixture is pumped into the permafrost region of a wellbore to be cemented and allowed to harden in the wellbore. There is also provided a process for treating an aqueous drilling fluid after it has been used in drilling the wellbore in permafrost, and a cementitious composition for cementing in a permafrost region of a wellbore.

REFERENCES:
patent: 2705050 (1955-03-01), Davis et al.

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