Patent ID: 7928041

Claim:
A method of treating a portion of a well, the method comprising the steps of: (a) forming a treatment gel comprising a polymer system of a mixture of two or more polymers, wherein the polymer system is capable of each of the following, when tested 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 system and water 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 least one pH of less than 4; and (iii) dissolving at least one pH of greater than 9; wherein the polymer system comprises at least a first polymer and a second polymer; and wherein the first polymer and second polymer have a degree of polymerization of at least 100; (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.