Polymer article and its use for controlled introduction of reagent into a fluid
First Claim
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1. A method for the controlled introduction of a water-soluble reagent into an environment containing condensed water which comprises:
- (a) suspension copolymerizing a monomer selected from acrylic acid, acrylamide, and acrylonitrile with a difunctional hydrophylic comonomer to form water-insoluble hard solid particles of a polymer having a softening point above said environment, said particles having structural integrity, internal porosity, and a particle size of at least 50 microns and less than 2 millimeters, said monomer with said comonomer having dissolved therein a water soluble reagent which is insoluble in said polymer whereby said reagent remains in the pores of said particles following the copolymerization step, said reagent constituting at least 5 weight percent and not more than 30 weight percent based on the combined weights of the polymer and the reagent;
said reagent being selected from the group consisting of scale inhibitors, surfactants, corrosion inhibitors, biocides, foamers, and oxygen scavengers;
(b) placing said particles in said environment;
(c) flowing water through said particles thereby leaching an effective amount of said water-soluble reagent from said particles forming an aqueous solution of said reagent in said environment, said particles retaining their physical structural integrity; and
(d) flowing said aqueous solution in said environment.
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Abstract
A solid polymeric body comprising a polymer matrix containing a water-soluble reagent leachable into a fluid containing condensed water, said matrix being reagent permeative and insoluble in said fluid containing condensed water and the said body preferably having a softening point substantially above that of the temperature of the fluid environment in which it is to be employed is useful for the introduction of an additive reagent into said fluid particularly when said fluid is located in a subterranean formation.
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Citations
13 Claims
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1. A method for the controlled introduction of a water-soluble reagent into an environment containing condensed water which comprises:
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(a) suspension copolymerizing a monomer selected from acrylic acid, acrylamide, and acrylonitrile with a difunctional hydrophylic comonomer to form water-insoluble hard solid particles of a polymer having a softening point above said environment, said particles having structural integrity, internal porosity, and a particle size of at least 50 microns and less than 2 millimeters, said monomer with said comonomer having dissolved therein a water soluble reagent which is insoluble in said polymer whereby said reagent remains in the pores of said particles following the copolymerization step, said reagent constituting at least 5 weight percent and not more than 30 weight percent based on the combined weights of the polymer and the reagent;
said reagent being selected from the group consisting of scale inhibitors, surfactants, corrosion inhibitors, biocides, foamers, and oxygen scavengers;(b) placing said particles in said environment; (c) flowing water through said particles thereby leaching an effective amount of said water-soluble reagent from said particles forming an aqueous solution of said reagent in said environment, said particles retaining their physical structural integrity; and (d) flowing said aqueous solution in said environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification