Abstract: An eductor with a jet ring assembly for generating a low pressure region for detaching and removing residual drilling fluid solids from the internal walls of the eductor is disclosed. The eductor can include: induction ports, liquid induction ports, a mixing chamber, a diffuser, and a jet ring adaptor that can generate the low pressure region. Also disclosed is a method for removing residual drilling fluid solids (wall cake) from internal walls of the eductor. The method can include: stopping the flow of a first pressurized fluid to the eductor, stopping discharge from a diffuser of the eductor, and pressurizing a jet ring assembly using a second pressurized fluid to detach and remove the wall cake from the internal walls of the eductor.

Abstract: An eductor apparatus has an inlet nozzle section with a primary inlet and a nozzle, a mixing chamber connected to the inlet nozzle section and in fluid communication with a narrow diameter opening of the nozzle, and a diffuser section connected to the mixing chamber opposite the inlet nozzle section. The diffuser section has throat formed therein. The throat has a plurality of lobes formed thereon. The plurality of lobes extend longitudinally along the throat. The lobes are generally equally circumferentially spaced from each other around the throat. The narrow diameter opening of the nozzle has another plurality of lobes formed therearound and extending in longitudinally alignment with the plurality of lobes of the throat.

Abstract: The invention relates to a method for mixing a static fluid with another component, such as a particulate material, a liquid, a compressible liquid or gas, or combinations thereof, using a motive fluid stream, producing a low pressure region within the static fluid using radial eductors in a tank. The invention further relates to a method for separating oil form an oil and water mixture using a motive fluid stream and air, producing a low pressure region in a tank with entrained air bubbles, wherein the oil attaches to the air bubbles and rises to the surface.

Abstract: A method for dust-free low pressure mixing for conveying and mixing secondary dry and secondary liquid components into a primary liquid component with a hermetically sealed system, the method comprising: using a cyclone separator to capture dust from a surge tank and form a recovered product, using a flow promoter to prevent bridging an rat-holing, pressurizing an eductor to draw dry components into a mixing chamber, fluidizing the dry component, and expelling the fluidized dry component.