Abstract: Systems and methods provided herein relate to a fluid mixing device for a pipeline. The pipeline includes a pipe wall and a first axial bore that extends from an inlet of the pipeline to an outlet of the pipeline for conveying a pipeline fluid through the pipeline from the inlet to the outlet. The fluid mixing device includes a fluid source operable to supply a mixing fluid to the axial bore through one or more orifices fluidly coupled to the fluid source. The one or more orifices include a first orifice. The first orifice includes an intake portion operable to receive the mixing fluid and defining a first interior diameter, a discharge portion operable to discharge the mixing fluid and defining a second interior diameter smaller than the first interior diameter, and a taper portion intermediate the intake portion and the outlet portion.