Glossary

see wye connection.

see Y-sub.

in multiple packer completion, a device, made up just below the uppermost packer, that switches tubular fluids to the annulus and annular fluids to the tubing above that packer. Also called a Y-block.

on a mobile offshore drilling rig or ship, the angular motion as the bow or stern moves from side to side. v: to move from side to side (as a ship).

yard.

square yard.

cubic yard.

see hydraulic control pod.

the number of barrels of a liquid slurry of a given viscosity that can be made from a ton of clay. Clays are often classified as either high- or low-yield. A ton of high-yield clay yields more slurry of a given viscosity than a low-yield clay.

the maximum stress that a solid can withstand without undergoing permanent deformation either by plastic flow or by rupture. See tensile strength.

in a joint of riser pipe, a measure of the amount of pressure inside or outside the riser that is required to permanently distort it.

the resistance to initial flow, or the stress required to start fluid movement. This resistance is caused by electrical charges located on or near the surfaces of the particles. The values of the yield point and thixotropy, respectively, are measurements of the same fluid properties under dynamic and static states. The Bingham yield value, reported in pounds/100 square feet, is determined from a direct-indicating viscometer by subtracting the plastic viscosity from the 300-rpm reading. Also called yield point.

a stationary piece of ferromagnetic material without windings, which permanently connects two or more magnet cores.

in mechanics, the ratio of a simple tension stress applied to a material to the resulting strain parallel to the tension.