Compositions comprising an acrylamide-containing polymer and process therewith

A composition consisting essentially of an acrylamide-containing polymer having repeat units derived from acrylamide and at least one olefinic comonomer;

• a polypropylene glycol;
• and a polysaccharide selected from the group consisting of starches, gums, celluloses, biopolysaccharides, and combinations of two or more thereof;
• wherein said acrylamide-containing polymer and said polypropylene glycol are each present in a sufficient amount effective to control fluid loss of a water-based fluid containing said composition;
• the mole percent of said acrylamide in said acrylamide-containing polymer is in the range of from about 20 to about 85%;
• and the molecular weight of said polypropylene glycol is in the range of from about 1,200 to about 5,000.

A composition comprising an acrylamide-containing polymer having repeat units derived from acrylamide and at least one olefinic comonomer;

• a polypropylene glycol;
• and calcium chloride wherein said acrylamide-containing polymer and said polypropylene glycol are each present in a sufficient amount effective to control fluid loss of a water-based fluid containing said composition;
• the molecular weight of said polypropylene glycol is in the range of from about 1,200 to about 5,000;
• the mole percent of said acrylamide in said acrylamide-containing polymer is in the range of from about 20 to about 85%;
• and said olefinic comonomer is selected from the group consisting of R--C(R).dbd.C(R)--C(O)--C(R)(R), R--C(R).dbd.C(R)--C(O)--N(R)--Y--R, R--C(R).dbd.C(R)--C(O)--G--Y--Z, R--C(R).dbd.C(R)--C(O)--G--Y--W, CH.sub.2 .dbd.CH--C(O)--N(R)--(CH.sub.2).sub.n --CH.sub.3, and combinations of any two or more thereof wherein:
• each R is independently selected from the group consisting of hydrogen, alkyl radicals, aryl radicals, aralkyl radicals, alkalkyl radicals, cycloalkyl radicals, and combinations of any two or more thereof wherein each radical can contain 1 to about 12 carbon atoms;
• G is O or NH;
• Y is an alkylene radical having 1 to 4 carbon atoms;
• W is an acid moiety selected from the group consisting of phosphonic acids, phosphoric acids, phosphinic acids, sulfuric acids, sulfonic acids, sulfurous acids, sulfinic acids, carboxylic acids, alkali metal salts of the acids, ammonium salts of the acids, and combinations of any two or more thereof;
• Z has a formula selected from the group consisting of N(R)(R), N.sup.+ (R)(R)(R)X.sup.-, and combinations of any two or more thereof wherein each R is independently selected from the group consisting of hydrogen, alkyl radicals, aryl radicals, aralkyl radicals, alkalyl radicals, cycloalkyl radicals, and combinations of any two or more thereof wherein each radical can contain 1 to about 12 carbon atoms;
• X is an inorganic anion selected from the group consisting of sulfonates, sulfinates, sulfates, phosphonates, phosphinates, phosphates, halides, nitrates,and combinations of any two or more thereof;
• and
• n is a number of from 0 to about 10.

A composition prepared by combining calcium chloride, a polypropylene glycol polymer, an acrylamide-containing polymer, a polysaccharide, and water wherein:

• said acrylamide-containing polymer comprises repeat units derived from acrylamide and an olefinic comonomer which is selected from the group consisting of vinyl acetate, vinylpyridine, styrene, methyl methacrylate, acryloylpiperazine, methacryloylpiperazine, methacryloylmorpholine, methacrylamide, acrylonitrile, methacrylic acid, ammonium salt of methacrylic acid, alkali metal salts of methacrylic acid, 2-methacryloyloxyethyltrimethylamine, 2-acrylamido-2-methylpropane sulfonic acid, alkali metal salts of 2-acrylamido-2-methylpropane sulfonic acid, 2-methacryloyloxyethane sulfonic acid, alkali metal salts of 2-methacryloyloxyethane sulfonic acid, acryloylmorpholine, N-4-butylphenylacrylamide, 2-acrylamido-2-methylpropane dimethylammonium chloride, 2-methacryloyloxyethyldiethylamine, 3-methacrylamidopropyldimethylamine, vinylsulfonic acids, alkali metal salts of vinylsulfonic acid, styrene sulfonic acid, alkali metal salts of styrene sulfonic acid, N-vinyl-2-pyrrolidone, and combinations of any two or more thereof;
• the molecular weight of said polypropylene glycol is in the range of from 1,500 to 5,000;
• the mole percent of said acrylamide in said acrylamide-containing polymer is in the range of from 20 to 80%;
• said polysaccharide is selected from the group consisting of starches, gums, celluloses, biopolysaccharides, and combinations of two ore more thereof;
• and
• said water is selected from the group consisting of pure water, regular tap water, a solution, a suspension, and combinations of two or more thereof.