Oil well drilling cement dispersant

Details Oil well drilling cement dispersant Oil well drilling cement dispersant

1987-09-04

1989-07-11

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 90, 106315, 530505, C04B 2418

Patent

active

048468886

ABSTRACT:
An additive for oil well drilling cement is provided by an azo lignosulfonate formed from the coupling of a diazonium salt made from sulfanilic acid or para-aminobenzoic acid and a lignosulfonate to provide an effective cement dispersant with low set time retardation.

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patent: 4457853 (1984-07-01), Detroit
patent: 4505825 (1985-03-01), Detroit
patent: 4674574 (1987-06-01), Savoly et al.
Psotta et al., "Lignosulfonate Crosslinking Reactions.1, The Reactions of Lignosulfonate Model Compounds with Diazonium salts", Holzforschung, 37(2), pp. 91-99, 1983, Chem. Abstract CA99(2):7018Q.
Forbes et al., "Lignosulfonate Crosslinking Reactions.2, The Coupling of Lignosulfonate with Diazonium Salts", Holzforschung, 37(2), pp. 101-106, 1983, Chem. Abstract CA98(26):217427c.
Hawley, Gessner, "The Condensed Chemical Dictionary", 8th Edition, p. 516, 1974.
Article entitled "Cementing" by Dwight K. Smith, published in 1976, p. 25.

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