Use of polyimides in treating subterranean formations

A method of treating a subterranean formation penetrated by a wellbore, the method comprising:

• a. forming a treatment fluid comprising an aqueous carrier fluid, a water-insoluble solid-form polysuccinimide homopolymer or copolymer and at least one of a viscosifying agent, proppant and an acid capable of dissolving materials of the formation;
• b. introducing the treatment fluid into the formation through the wellbore;
• c. allowing the polyimide to hydrolyze over time and become water-soluble;
• and
• d. providing scale inhibition over time in formation and within proppant.

A method of treating a sandstone-containing formation penetrated by a wellbore, the method comprising:

• forming a treatment fluid comprising an aqueous solution containing a hydrogen fluoride source, ammonium hydroxide and at least one of a polyimide and a polycarboxylate;
• wherein the ammonium hydroxide and the polyimide are mixed together prior to addition of the hydrogen fluoride source to facilitate degradation of the polyimide to form an aqueous polycarboxylate solution, the treatment fluid comprising the aqueous polycarboxylate solution and the hydrogen fluoride source;
• and
• introducing the treatment fluid into the formation through the wellbore.