Fluid loss control additives for oil well cementing compositions

Details Fluid loss control additives for oil well cementing compositions Fluid loss control additives for oil well cementing compositions

1991-01-22

1991-09-10

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

523130, E21B 3314

Patent

active

050465627

ABSTRACT:
A cementing composition useful in cementing oil, gas and water wells, comprising water, hydraulic cement and an effective amount of water soluble fluid loss additive comprised of a blend of a copolymer of acrylamide/vinyl imidazole in a weight percent ratio of from about 95:5 to 5:95, said copolymer having a molecular weight range of from about 100,000 to 3,000,000, and a terpolymer of acrylamide/acrylamidomethylpropane sulfonic acid sodium salt/vinyl imidazole in a weight percent ratio of 60:20:20, said terpolymer having a molecular weight range of from about 100,000 to 3,000.000. The blend is comprised of a weight percent ratio of copolymer to terpolymer in the range of 20:80 to 80:20. The composition can also optionally include a dispersant such as sodium or potassium salts or a sulfonated naphthalene formaldehyde condensate.

REFERENCES:
patent: 4471097 (1984-09-01), Uhl et al.
patent: 4931489 (1990-06-01), Kucera et al.
patent: 4933378 (1990-06-01), Kucera et al.

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