Oxidizing Breaker Agents
Sunita offers a variety of breaker agents for breaking both gelling agents and friction reducers. Free radicals formed by the thermal degradation of these oxidizing breakers attack the backbone of the polymer cleaving the polymer into small segments and thereby reducing viscosity. Fracturing fluid viscosity can be reduced to near the viscosity of water allowing for a better return of the fluid to the surface.
Oxidizing breakers can be delivered in liquid or solid form. Common breakers are sodium and ammonium persulfate. These are non-delayed breakers which begin to reduce viscosity at temperatures above 120°F. An activator is required at lower temperatures.
Encapsulated Breaker Agents
Encapsulated breakers slowly release ammonium persulfate for use as a breaker in guar and guar derivative based fracturing fluids at <300˚F. Higher concentrations of breaker can be used without compromising fluid viscosity during proppant placement. This allows the break of the fracturing fluid to be delayed or increased breaker concentrations can be used. Higher breaker concentrations will improve the clean-up of the proppant pack enhancing fracture conductivity. Sunita offers encapsulated Ammonium Persulfate for delayed applications at moderate temperatures and encapsulated Sodium Bromate for high temperature applications.
Enzyme Breaker Agents
Sunita offers enzyme breakers designed for breaking Guar polymer. These enzymes effectively reduce fluid viscosity at temperatures up to 250ۥF. Enzymes are not consumed during the breaking process and continue to work over time. This allows the polymer segments to be reduced to shorter segments and offering a cleaner broken fluid.