Abstract: Methods and systems for disposing of fluids, such as brine or produced water or CO2, in a disposal well that requires the injection well to be seismically monitored is described. Injection continues until a seismic event of threshold value caused by the injection is detected. The first injection point is then closed until the first event dissipates (e.g., pressure is reduced). Meanwhile, fluid is injected into an open injection point, again until a second seismic event is detected. Then the second injection point is closed and a third injection point (or the first if sufficiently dissipated) is opened and used for injection, and so on. In this way, the seismic risk is greatly reduced.

Abstract: Desalination of produced water is performed by pre-treatment of produced water to reduce pH, whereupon the reduced pH produced water is fed into desalination unit thereby producing high-quality desalinated water and also increasing the longevity of desalination unit by not clogging filters of the desalination unit. The method can be coupled with any desalination unit on site, thus allowing flexibility in application.