Wells – Processes – Cementing – plugging or consolidating
Patent
1987-04-01
1987-11-17
Schofer, Joseph L.
Wells
Processes
Cementing, plugging or consolidating
166293, E21B 3313
Patent
active
047067551
ABSTRACT:
A polymer of monoallylamine, preferably a water-soluble polymer of monoallylamine, whether in free (i.e., unneutralized) form or in salt (i.e., partially or completely neutralized) form is used in conjunction with a sulfonated polymer such as a water-soluble lignosulfonate, condensed naphthalene sulfonate, or sulfonated vinyl aromatic polymer, to minimize fluid loss from the slurry during subterranean well cementing operations. The polymer of monoallyl amine may be a homopolymer or a copolymer, and may be crosslinked or uncrosslinked. These components interact with each other in the presence of water to produce a gelatinous material that tends to plug porous zones and minimize premature water loss from the well cement slurry when present in the subterranean well formation. In addition, the gelatinous material so formed prevents de-stabilization of the slurry in the well formation.
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Bandlish Baldev K.
Nugent, Jr. Adam
Roark David N.
Ethyl Corporation
Johnson Donald L.
Sarofim N.
Schofer Joseph L.
Sieberth John F.
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