The concentrations of dispersed and dissolved oils, solids and additive chemicals in produced or injected water are typically restricted under environmental guidelines or operational requirements. The former is especially important when discharging water to the environment, while the latter must be considered to avoid disposal well formation damage. Returning excess petroleum product to the reservoir in injection water is economically undesirable. Disposed or injected water quality is monitored by a variety of methods. Continuous monitoring of chemical constituents in water is a common practice in the industry, and is usually favored over manual monitoring methods. Technology applied in continuous monitoring of oils, solids, treatment chemicals and naturally-occurring, environmentally-sensitive constituents is advancing, particularly in detection methods. Monitoring water real-time in the presence of optical foulants is overcome by deploying ultrasonic cleaning methods. Technological advances in on-line and in-line monitoring of oily or additive components in disposed water are presented and discussed.
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