Methods, compositions and fluid loss control additives for cementing in
subterranean zones are disclosed. A composition comprises a hydraulic
cement, sufficient water to from a slurry and a water soluble
biodegradable fluid loss control additive comprising a mixture of a
condensation product and hydroxyethylcellulose having a molar substitution
in the range of from about 1 mole to about 2.5 moles of ethylene oxide.
