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Methods of treating a portion of a well with a polymer or polymer system capable of forming a gel that dissolves at a low and high pH

  • US 20100234251A1
  • Filed: 03/12/2009
  • Published: 09/16/2010
  • Est. Priority Date: 03/12/2009
  • Status: Active Grant
First Claim
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1. 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;

    (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.

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