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
First Claim
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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Accused Products
Abstract
Methods for treating a portion of a well include the steps of: (a) forming a treatment gel comprising a polymer or a polymer system of a mixture of two or more polymers, wherein the polymer or 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 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 in the range of 2-4; and (iii) dissolving at least one pH in the range of 9-12; (b) dispersing the treatment gel in a fluid to form a treatment fluid; (c) introducing the treatment gel in a 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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Citations
22 Claims
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1. A method of treating a portion of a well, the method comprising the steps of:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification