Patent ID: 7932215

Claim:
A method of treating a portion of a well, the method comprising the steps of: (a) forming a treatment gel comprising a polymer, wherein the polymer is capable of each of the following, when tested at at least one concentration in the range of 2-10 times C* in deionized water, at about 22° C., and at about 1 atmosphere pressure: (i) forming a polymer gel of the polymer and water at at least one pH in the range of 4-9, wherein a bulk form of the polymer gel has a G′ greater than G″ at all frequencies in the range of 1 rad/sec-100 rad/sec; (ii) dissolving at at least one pH in the range of 2-4; and (iii) dissolving at at least one pH in the range of 9-12; wherein the polymer is selected from a class of polymer having polymer molecules including weak acid functional groups and weak base functional groups; and wherein the polymer is a copolymer; (b) dispersing the treatment gel in a fluid to form a treatment fluid; (c) introducing the treatment gel in the treatment fluid into a portion of a well; and (d) after the step of introducing the treatment gel, adjusting the pH of the treatment gel to at least one pH in the range of 2-4 or 9-12.