초록

A method of preventing or reducing the migration of fines in a permeable structure comprising contacting the fines with organic copolymers which can be either nonionic in a neutral media or can contain up to 95% by weight of a quaternary ammonium salt monomer.

대표청구항 ▼

A method of preventing or reducing the migration of fines in a permeable Subterranean Formation comprising: contacting said fines in said permeable structure with an effective amount of an organic copolymer having recurring structural monomer units formed in a random fashion of the formula: [Figure]

A method of preventing or reducing the migration of fines in a permeable Subterranean Formation comprising: contacting said fines in said permeable structure with an effective amount of an organic copolymer having recurring structural monomer units formed in a random fashion of the formula: [Figure] wherein X is independently selected from the group consisting of oxygen and NH; R1, R6, and R8 are independently selected from the group consisting of hydrogen and methyl; R2 is an alkylene group having 1 to about 4 carbon atoms; R3 and R5 are independently selected from the group consisting of methyl and ethyl; R4 is optionally present and is selected from the group consisting of: (1) an alkyl group having from 1 to about 6 carbon atoms; and (2) a quaternary ammonium group having the general formula: [Figure] wherein: R10 is selected from the group consisting of an alkylene group having from about 2 to about 6 carbon atoms and a substituted alkylene group having from about 2 to about 6 carbon atoms and containing a hydroxyl group or from 1 to about 3 ether groups; R11, R12, and R13 are independently selected from the group consisting of methyl and ethyl; Y is selected from the group consisting of oxygen and NR16 wherein R16 is selected from the group consisting of hydrogen, methyl and ethyl; R7 is selected from the group consisting of an alkyl group having from 1 to about 3 carbon atoms; and, [Figure] wherein: R14 and R15 are independently selected from the group consisting of methyl and ethyl; and, R21 is selected from the group consisting of methylene, ethylene, and trimethylene; R9 is selected from the group consisting of hydrogen, an alkyl group containing 1 to about 4 carbon atoms, a substituted alkyl group having from 1 to about 4 carbon atoms and containing a hydroxyl group, a carboxyl group, or －SO3J wherein J is selected from the group consisting of hydrogen, sodium and potassium, and, [Figure] wherein R17 is selected from the group consisting of methylene, ethylene, and trimethylene; and, R18, R19, and R20 are independently selected from the group consisting of methyl and ethyl; Z is selected from the group consisting of oxygen and NH and provided further when Z is oxygen, R9 may further be selected from the group consisting of sodium and potassium; A is an anion selected from the group consisting of chloride, bromide, iodide, methyl sulfate, and sulfate; m is an integer equal to the number of anions required to maintain electronic neutrality; n, r, and s are integers the sum of which equals the total number of monomer units in the copolymer required to give a molecular weight in the range of from about 50,000 to about 1,000,000; and, monomer unit I is present in the range of from about 25 to about 95 mole percent in the copolymer; monomer unit II is present in the range of from about 5 to about 75 mole percent of the copolymer; and, monomer unit III is present in the range of from about 0 to about 35 mole percent of the copolymer.