Method of controlling fluid loss from thixotropic cement

Details Method of controlling fluid loss from thixotropic cement Method of controlling fluid loss from thixotropic cement

1977-06-17

1978-07-25

Novosad, Stephen J.

Wells

Processes

Specific low fluid loss feature for fracturing fluid or...

166291, E21B 3316, E21B 33138

Patent

active

041024001

ABSTRACT:
In cementing a well with a thixotropic cement, such as with the portland cement/CaSO.sub.4.1/2H.sub.2 O/water slurry described in U.S. Pat. No. 3,563,313, an effective means for controlling fluid loss from the slurry is to precede the slurry with a fluid comprising water, a water soluble alkali metal compound capable of releasing a multivalent metal cation to react with the soluble silicate to form a pumpable gel, and a water dispersible cellulose compound and an inert particulate which together impart fluid loss control to the fluid. Optionally, the fluid may contain one or more of: a chelating agent for polyvalent metal cations; a weighing material; a material to minimize lost circulation, and a salt to stabilize fresh water sensitive sandstones and shales, e.g., those having a high clay content.

REFERENCES:
patent: 2848051 (1958-08-01), Williams
patent: 3390723 (1968-07-01), Hower et al.
patent: 3408296 (1968-10-01), Kuhn et al.
patent: 3411582 (1968-11-01), Dale
patent: 3467193 (1969-09-01), Messenger
patent: 3563313 (1971-02-01), Spangle
patent: 3625286 (1971-12-01), Parker
patent: 3753903 (1973-08-01), Fischer et al.
patent: 3989632 (1976-11-01), Fischer et al.

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