Inhibitor Partitioning Efficiency Using Fluorescence Spectroscopy Detection

Hoshowski, Jody (Schlumberger) | Perez-Pineiro, Rolando (Schlumberger) | Jenkins, Alyn (Schlumberger) | Cruz-Perez, Diansy (Schlumberger)


ABSTRACTInhibitors have been used to mitigate corrosion in oil and gas producing assets. The efficiency of inhibitors are affected by several variables with the ability of an inhibitor to transport through the produced fluids onto the metal surface being one of the most important requirements. This can be achieved by formulating inhibitor products with a variety of chemistries that minimize their solubility in oil and are either soluble or dispersible in the brine.The partitioning of inhibitor products between the oil and aqueous phases require a reliable method to evaluate different inhibitor products. An analytical method using fluorescence spectroscopy has been developed as a means to measure inhibitor concentration. This new method offers several advantages over other commonly used techniques, such as dye transfer methods. The method offers a greater degree of accuracy, can be performed in the laboratory or at the well site, and individual analysis can be performed relatively quickly. Further, the performance of such formulations were evaluated under autoclave conditions in order to determine their applicability to existing producing systems.INTRODUCTIONCorrosion in metals is defined as the degradation of the materials' properties due to interactions with their environments1 and it has a significant impact on every stage of the oil and gas industry from production to transportation. In a study conducted from 1999 to 2001 by CC Technologies Laboratories, Inc., with support from the FHWA and NACE the total direct corrosion cost for the oil and gas exploration and production industry in the U.S. was estimated at 1.4 billion. The previous amount included expenses associated with surface pipeline and facilities, downhole tubing and capital expenditures related to corrosion.2 A recent report predicts this figure to be notably higher by 2015 due to the steady increase of direct and indirect costs of corrosion over the years, fueled by inflation and the expansion of oil and gas exploration and production.3