Method for completing a well in a permafrost zone

Details Method for completing a well in a permafrost zone Method for completing a well in a permafrost zone

1975-08-25

1976-12-07

Purser, Ernest R.

Wells

Processes

Heating, cooling or insulating

166312, 166DIG1, E21B 4300

Patent

active

039956954

ABSTRACT:
In a method for completing a well in a permafrost zone wherein an at least partially freezable liquid may be left in at least one annulus of the well in the permafrost zone, the method of washing the freezable liquid from the at least one annulus using from about one-quarter to about four system volumes of a wash liquid, the wash liquid having a base liquid of the same class as the freezable liquid, carrying out the washing step under turbulent flow conditions, and displacing the wash liquid from the annulus with a displacement liquid which undergoes insufficient volume increase to damage the well pipe should the displacement liquid subsequently cool to the in situ temperature of the permafrost.

REFERENCES:
patent: 3618680 (1971-11-01), Ellard et al.
patent: 3662832 (1972-05-01), Keeler et al.
patent: 3791448 (1974-02-01), Schuh
patent: 3831678 (1974-08-01), Mondshine
Grayaznov, "Special Features of Drilling Deep Wells in Permanently Frozen Formations," No. 8, pp. 7-11, 1965 (Permafrost Abstracts, 11/27/65).

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