Breaker systems for wellbore treatment operations for use at varying temperatures
Compositions and methods of using such compositions to, for example, reduce the viscosity of treatment fluids are provided. In one embodiment, the methods include: providing a treatment fluid including a base fluid, a viscosifier, and a breaker system including a gel stabilizer; a delayed release oxidative breaker; and a delayed release enzyme breaker; and allowing the breaker system to reduce a viscosity of the treatment fluid.
1. A method comprising:
providing a treatment fluid comprising a base fluid, a viscosifier, and a breaker system comprising
a gel stabilizer;
a delayed release oxidative breaker; and
a delayed release enzyme breaker;
introducing the treatment fluid into a wellbore penetrating at least a portion of a subterranean formation at or above a pressure sufficient to create or enhance one or more fractures within the subterranean formation;
performing a steam assisted gravity drainage process after introducing the treatment fluid, wherein the subterranean formation has two or more different regions with at least two unknown temperatures within the range from about 0° C. (32° F.) to about 350° C. (662° F.);
allowing the treatment fluid to initiate the one or more fractures and enter at least two or more different regions of the subterranean formation without breaking the treatment fluid; and
allowing the breaker system to reduce a viscosity of the treatment fluid in the two or more different regions of the subterranean formation.
2. The method of claim 1 , wherein the gel stabilizer is an oxygen scavenger.
3. The method of claim 1 , wherein the treatment fluid further comprises a delayed acid breaker.
4. The method of claim 3 , wherein the delayed acid breaker is selected from the group consisting of: an ester, an encapsulated acid, any derivative there, and any combination thereof.
5. The method of claim 1 , wherein the breaker system comprises an encapsulating coating.
6. The method of claim 1 , wherein the step of introducing the treatment fluid into the wellbore is performed using one or more pumps.
7. The method of claim 1 , wherein the delayed release oxidative breaker is selected from the group consisting of: magnesium oxide, sodium perborate, a persulfate, sodium bromate, sodium chlorite, any derivative thereof, and any combination thereof.
8. The method of claim 1 , wherein the delayed release enzyme breaker is selected from the group consisting of hemicellulase, xanthanase, any derivative thereof, and any combination thereof.
9. The method of claim 3 , wherein the delayed acid breaker is in the treatment fluid in an amount of from about 0.01 kg/m 3 (0.08 lb/1000 gallon) to about 4.8 kg/m 3 (40 lb/1000 gallon).