Patent
Cement set retarding additives, compositions and methods
TLDR
The set retarding additives are graft copolymers or terpolymers comprised of the condensation polymer product of a ketone, aldehyde and a compound which introduces acid groups into the polymer having grafted thereto a monomer selected from the group consisting of acrylic acid, vinyl phosphonic acid, methacrylic acid, maleic acid or one of the foregoing monomers and a second monomer of 2-acrylamido-2-methylpropane sulfonic acid.Abstract:
The present invention provides set retarding additives, set retarded hydraulic cement compositions including such additives and methods of using the cement compositions for cementing zones in wells. The set retarding additives are graft copolymers or terpolymers comprised of the condensation polymer product of a ketone, aldehyde and a compound which introduces acid groups into the polymer having grafted thereto a monomer selected from the group consisting of acrylic acid, vinyl phosphonic acid, methacrylic acid, maleic acid and itaconic acid or one of the foregoing monomers and a second monomer of 2-acrylamido-2-methylpropane sulfonic acid.read more
Citations
More filters
Patent
Cement compositions with improved fluid loss characteristics and methods of cementing in surface and subterranean applications
TL;DR: Improved fluid loss control additives for use in cement compositions are provided in this article, which are suitable for use both in surface and underground well completion and remedial operations, such as primary cementing, e.g., cementing casings and liners in well bores.
Patent
Settable spotting fluid compositions and methods
TL;DR: Improved settable spotting fluid compositions and methods are provided in this article, which are basically comprised of a hydraulic settable component comprised of fly ash, a fluid loss control additive, a gel strength inhibiting additive and water selected from the group of fresh water and salt water present in an amount sufficient to form a slurry having a density in the range of from about 12 to about 15 pounds per gallon.
Patent
Methods and oil-based settable spotting fluid compositions for cementing wells
TL;DR: In this article, a method for cementing a pipe string in a well bore containing oil-based drilling fluid using oilbased settable spotting fluid compositions is described. But this method requires a hydraulically settable component and a de-emulsifying surfactant.
Patent
Oil-based settable spotting fluid
TL;DR: In this paper, oil-based settable spotting fluid compositions and methods of using the compositions are provided and the authors provide an overview of the methods and methods for using these compositions.
Patent
Method for control of fluid loss and gas migration in well cementing
TL;DR: In this paper, a random polymerization product of two or three different vinyl-containing monomers including a vinylamide morpholine derivative was used to reduce fluid loss from the cement slurry used to cement the borehole to the subsurface formation.
References
More filters
Patent
Method of reducing fluid loss in cement compositions which may contain substantial salt concentrations
TL;DR: In this paper, a fluid loss additive for use in oil, gas, water and other well-cementing operations is described. And the graft pendant groups, which are selected from the group of homopolymers, copolymers and terpolymers of 2-acrylamido-2-methylpropanesulfonic acid, acrylonitrile, N,N-dimethyl acrylamide, acrylic acid, N-dialkylaminoethylmethacrylate and their salts.
Patent
Hydrolytically stable polymers for use in oil field cementing methods and compositions
TL;DR: In this paper, the authors disclosed the methods of using such copolymers and copolymer salts in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation.
Patent
Set retarded cement compositions and methods for well cementing
TL;DR: In this article, set retarded cement compositions for cementing across a zone or zones in a well having enhanced compressive strength and rapid gel strength development after placement are presented. But the authors do not provide any methods of using the set retarder.
Patent
Dispersant and fluid loss additives for oil field cements
TL;DR: In this article, a fluid loss additive for inclusion in oil field cements and methods of using the resultant compositions in oil, gas and water well well cementing operations are disclosed, such compositions incorporate a polymeric additive prepared by caustic-catalyzed condensation for formaldehyde with acetone, or a substance derived from acetone.
Patent
Dispersant for concrete mixtures of high salt content
Aignesberger Alois,Johann Plank +1 more
TL;DR: In this article, condensation products of aldehydes and ketones, which contain acid groups and are especially suitable as dispersants for binding agent mixtures of high salt content, are described.