restricting, via a flow control device, a flow of fluid from a subsurface formation and into a tubular string positioned in a wellbore, wherein the flow control device is configured with one or more flow restrictors to increase a flow velocity of the fluid as the fluid flows through the flow control device; and

clustering dissolved ions within the flow of the fluid based on generating, via a magnetic assembly positioned at least partially around a circumference of a flow path downstream of an entrance of the one or more flow restrictors where the flow velocity is increased, a magnetohydrodynamic force in the fluid as the fluid flows through the flow control device.