In the Golfo San Jorge basin (GSJB), in the area of Cerro Dragón, a sustained increase of activity has developed over the past ten years. Further development of the field has been achieved with well stimulations (hydraulic-fracturing treatments), increasing production rates.
This has resulted in increased water consumption for these operations. In an effort to ration water sources, well owners must find alternatives to reduce the volume of fresh water consumed.
Throughout the past five years, one operator has worked to use produced water, or low-quality injection water, as a source of water for stimulation applications. The methodology applied consisted of Identifying different types of water produced in the fieldPerforming tests on the waters (physical-chemical and bacteriological)Performing tests with commonly used fracturing fluids to identify good performanceConducting tests during field operationsEstablishing procedures for water injection from the results obtainedContinuous monitoring, as well as the introduction of new techniques and improvements
The results that were obtained demonstrate how the operations performed have gradually increased by using this methodology (412 of 760 fracturing treatments during 2010). In addition, the reduction in freshwater use was 54.8% of the total amount in 2010 (5.7 of 10.5 million gal).
This work has helped identify sources of produced water in the field that are acceptable for use in fracturing stimulation operations. A procedure has been established to help ensure a reliable fracturing fluid with good performance is always used in these operations. Additionally, new techniques and equipment have been incorporated that contribute to continuous improvements to the process.