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Backpressure.: The frictional or blocking pressure opposing fluid flow in a conduit. See: differential pressure.
Back tank.: The compartment on a shale shaker that receives drilling fluid from the flowline. See: possum belly, mud box.
Backing plate.: The plate attached to the back of screen cloth(s) for support.
Backup screen.: See: support screen.
Baffles.: Plates or obstructions built into a compartment to change the direction of fluid flow.
Balanced design hydrocyclone.: A hydrocyclone that has the lower apex adjusted to the diameter of the cylinder of air formed within the cone by the cyclonic forces of drilling fluid spinning within cone. This tends to minimize liquid discharge when there are no separable solids.
Balanced elliptical motion.: An elliptical motion of a shale shaker screen such that all ellipse axes are tilted at the same angle toward the discharge end of the shale shaker.
Ball valve.: A valve that uses a spherical closure with a hole through its center and rotates 90 to open and close.
Barite.: Natural barium sulfate, BaSO ₄, is used for increasing the density of drilling fluids. The API standard requires a minimum of 4.20 specific gravity. Commercial barium sulfate ore can be produced from a single ore or a blend of ores and may be a straight-mined product or processed by flotation methods. It may contain minerals other than barium sulfate. Because of mineral impurities, commercial barite may vary in color from off-white to gray...

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Drilling Fluids Processing Handbook

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