Fluid loss control in oil field cements

Details Fluid loss control in oil field cements Fluid loss control in oil field cements

1986-09-04

1987-08-04

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

106 90, 106314, C04B 735, E21B 3314

Patent

active

046839526

ABSTRACT:
A cement fluid-loss composition and its use in a well cementing process are disclosed. The cement fluid loss composition comprises an aqueous slurry of about 35 to about 90 weight percent of water based on weight percent of dry cement; and about 0.1 to about 2 weight percent of a terpolymer based on weight percent of dry cement, said terpolymer having the formula: ##STR1## wherein x is about 40 to about 98 mole %, more preferably about 50 to about 95 mole %, and most preferably about 80 to about 90, y is about 1 to about 50 mole %, more preferably about 2 to about 20 mole %, and most preferably about 5 to about 10 mole %, and z is about 1 to about 50 mole %, more preferably about 2 to about 20, and most preferably about 5 to about 10, y is equal to z, B is about 1 to about 50 mole %, more preferably about 2 to about 20 mole %, and most preferably about 5 to about 10 mole %, wherein B, y and z are less than 60 mole %.

REFERENCES:
patent: 3931096 (1976-01-01), Guilbault et al.
patent: 3943996 (1976-03-01), Guilbault et al.
patent: 4015991 (1977-04-01), Persinski et al.
patent: 4076699 (1978-02-01), Grimaud et al.
patent: 4393939 (1983-07-01), Smith et al.
patent: 4515635 (1985-05-01), Prabhakara et al.

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