Wells – Processes – Cementing – plugging or consolidating
Patent
1978-07-27
1979-12-04
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
106104, 166DIG1, 175 66, E21B 3314
Patent
active
041767209
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 lignosulfonate, 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: 2582459 (1952-01-01), Salathiel
patent: 2609882 (1952-09-01), Morgan et al.
patent: 3581825 (1971-06-01), Messenger
patent: 3937282 (1976-02-01), Shryock et al.
patent: 4065318 (1977-12-01), Detroit et al.
Stude, "High Alumina Cement Solves Permafrost Cementing Problems", Petroleum Engineer, Sep. 1969, pp. 64-66.
Atlantic Richfield Company
MacDonald Roderick W.
Novosad Stephen J.
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