High temperature set retarded well cement compositions and metho

Details High temperature set retarded well cement compositions and metho High temperature set retarded well cement compositions and metho

1990-03-07

1991-03-05

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106725, 106730, 106805, 106809, 166292, 166293, 166294, 166295, 52744, 405266, 405267, C04B 2410

Patent

active

049974874

ABSTRACT:
Set retarded cement compositions which are substantially non-thinning at high temperatures are provided. The compositions are comprised of hydraulic cement, sufficient water to form a pumpable slurry, a set retarder and a galactomannan gum which has been treated with a hydrophobing agent whereby the hydration rate of the gum is retarded at temperatures below about 120.degree. F. and at pH levels above about 10. The delayed hydration of the treated gum offsets the thinning of the cement compositions at temperatures above about 120.degree. F. Methods of cementing subterranean zones penetrated by well bores utilizing the cement compositions are also provided.

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patent: 4766959 (1988-08-01), Allison
patent: 4806164 (1989-02-01), Brothers

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