The OneSTEP single sandstone acidizing stimulation system is a new approach that uses only one fluid stage. Rigorously engineered fluid systems and reduced volumes provide a lower-risk, cost-effective solution. The OneSTEP system removes damage caused by carbonate scale or other types of scale and by drilling fluids, clays, and other aluminosilicates.
The OneSTEP treatment offers more uniform stimulation of sandstone reservoirs with less risk of disintegrating the rock. It mitigates the risk of secondary and tertiary precipitates and reduces the tendency for acid emulsion and sludge formation. In addition, the OneSTEP system offers less corrosion risk to tubulars and equipment. It increases production with minimal risk and offers effective formation damage removal. The system promotes the stimulation of wells that were previously bypassed because of the fear of potential damage from conventional treatments.
The single fluid stage formulation saves costs because it requires less equipment, and it also saves preparation time. In addition, the reduced equipment requirements offer a smaller operational footprint, especially important in offshore activity. A single fluid stage permits simpler operations and reduces personnel exposure to health, safety, and environmental risks. Additionally, because it is only one fluid, the system reduces fluid placement sequence risk when treating long formation intervals. It offers a reduced chemical package that significantly reduces any compatibility issues with produced hydrocarbons.
Integral to the OneSTEP process is candidate selection using Virtual Lab geochemical simulation software. The software incorporates the results of slurry reactor tests and the candidate core tests to make predictions about treatment effects on damage removal and effective job volumes. Multiple treatments can be compared to select the best treatment for each well. This approach reduces the risk of mismatching fluids or using an incorrect fluid design for stimulation of a particular formation.