Retarded Acid | Carbonate Stimulation | Schlumberger

Single-Phase Retarded Acid

Improved carbonate reservoir contact

Single-phase retarded acid extends reservoir contact compared with conventional hydrochloric acid. The low reaction rate of the acid allows it to travel deep into the reservoir before completely spending. The single-phase retarded acid has a high dissolution capacity. The acid retarding component is completely water soluble; therefore, the resulting single-phase fluid can accommodate friction reducers, enabling higher pumping rates.

In matrix acidizing, the single-phase retarded acid creates longer wormholes in comparison with stimulation services using the same volume of unmodified hydrochloric acid.

In acid fracturing, the single-phase retarded acid’s low friction pressure enables high-rate pumping. In addition, when used in OpenPath Reach extended-contact stimulation services, the system’s low viscosity favors viscous fingering in designs that include a high-viscosity pad fluid.

The performance of the single-phase retarded acid is much better than HCI.

Single-phase retarded acid technology eliminates the use of diesel in injected fluids and lowers total fluid volume requirements, reducing operational resources, HSE risks, and environmental footprint.

OpenPath Reach Service Improves Acid Efficiency and Increases Oil Production 500%, Kazakhstan
An operator in Kazakhstan used extended-contact stimulation service with a low-viscosity, single-phase retarded acid system to reduce raw acid volume by 40% and increased well production by 500%.
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