The waterflood performance of the dual five-spot pilot project in the Stringtown oil field, situated in West Virginia, has been studied. A numerical simulator, called BOAST98, was used for the simulation purposes, after developing a reservoir description.

Sulfide released in the environment, due to high toxicity, even at low concentrations, may lead to serious environmental and health impacts. Therefore, is mandatory to develop highly sensitive, practical and inexpensive methods for detecting sulfide. Some of these analytical approaches are based on the methylene blue (MB) reaction, which has been successfully used in modified electrodes (MEs) development. MB-MEs hold promise as tools for detecting this electroactive anion. This study developed and characterized silica-niobiummethylene blue (SNMB) MEs, and evaluated their performance in sulfide determination through chronoamperometric and voltammetric techniques, under different experimental conditions. Within optimum conditions, the SNMB-MEs exhibited a linear response to sulfide anions from 7.6 to 63.4 μM, (r = 0.9979), whereas the detection and quantification limits were 2.03 mM and 6.77 mM, respectively. These results confirm the potential applicability of SNMB-ME for sulfide analysis and monitoring.