Additive composition for oil well cementing formulations

An oil and gas well cementing composition, comprising:

• a) cement;
• b) styrene/butadiene latex in an amount of from about 5% to about 30% by weight of said cement;
• c) from about 0.05% to about 2% by weight of the nonionic surfactant stabilizer additive alkylphenol ethoxylate of the following formula:
• R--C.sub.6 H.sub.5 --[CH.sub.2 --CH.sub.2 --O].sub.n --H
• wherein R is octyl, said alkylphenol ethoxylate having a molecular weight of from about 1000 to about 3000 such that n equals from about 25 to about 50;
• d) from about 0.05% to about 2% by weight of at least one nonionic surfactant stabilizer additive selected from the group consisting of tetra-functional ethylene oxide/propylene oxide ethylenediamine block copolymers having the following formula:
• ##STR5## and a molecular weight range of from about 3000 to about 30,000 and an ethylene oxide content of from about 10 to about 90%, and the nonionic surfactant additive of the formula:
• ##STR6## having a molecular weight of from about 1300 to about 12,000 and an ethylene oxide content of from about 10 to about 90%;
• and
• e) water in an amount such that the total quantity of water is from about 30% to about 60% by weight of said cement;
• said composition having a fluid loss value of less than about 55 mL/30 minutes.