Drilling

Drilling

Of or relating to the penetration of the Earth's surface in order to extract petroleum oil.

Contributors in Drilling

Drilling

A device that can be run into a wellbore with a smaller initial outside diameter that then expands externally to seal the wellbore. Packers employ flexible, elastomeric elements that expand. The two ...

hygrometer

Oil & gas; Drilling

A device for measuring the moisture in a gaseous atmosphere, such as the air, usually as percent relative humidity. Mechanical hygrometers detect moisture by elongation and shrinkage of a fiber or ...

scratcher

Oil & gas; Drilling

A device for cleaning mud and mud filter cake off of the wellbore wall when cementing casing in the hole to ensure good contact and bonding between the cement and the wellbore wall. The scratcher is ...

cement head

Oil & gas; Drilling

A device fitted to the top joint of a casing string to hold a cement plug before it is pumped down the casing during the cementing operation. In most operations, a bottom plug is launched before the ...

mud cleaner

Oil & gas; Drilling

A desilter unit in which the underflow is further processed by a fine vibrating screen, mounted directly under the cones. The liquid underflow from the screens is fed back into the mud, thus ...

lyophobic

Oil & gas; Drilling

A descriptive term for the lack of affinity (or repulsion) that a solid material has for the liquid in which the solid is dispersed. For example clay is lyophobic to oil.

lyophilic

Oil & gas; Drilling

A descriptive term for the strong affinity that a solid material (usually a colloid) has for the liquid in which the solid is dispersed. For example, clay is a lyophilic colloid in water.