An important element that is often overlooked during chemical qualification and application is the compatibility between oilfield chemicals (OFCs), which can critically impact the ability of the chemicals to meet their desired function in the field. In the area of corrosion control, one important example of this is the interference of oilfield chemicals on corrosion inhibitor effectiveness. In this study, we aimed to identify the primary sources of inhibition failure during the simultaneous use of a corrosion inhibitor with scale inhibitor, drag reducing agent, and biocides under particular field conditions. Results show that one type of biocide completely rendered the corrosion inhibitor ineffective, while other OFCs had no significant impact on corrosion inhibition. The findings in this study highlight the necessity for chemical compatilibty checks during corrosion inhibitor qualification, or when there is a change in other OFC formulation/application, to ensure proper corrosion protection is maintained. Additional work is ongoing to improve the fundamental understanding of chemical compatibility.