18 July 2017
An opening or space within a rock or mass of rocks, usually small and often filled with some fluid (water, oil, gas, or all three). Compare […]
18 July 2017
1) the condition of being porous (such as a rock formation). 2) the ratio of the volume of empty space to the volume of solid rock […]
18 July 2017
A choke in which the orifice size must be changed to change the rate of flow through the choke. See choke and orifice.
18 July 2017
These are air or hydraulic elevators operated on bails hanging below the traveling equipment, which provide a remote opening and closing of the elevator without human […]