دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

large, flat ocean floor, usually near a continent and usually over 4km (13100 ft) ss.

the weak section of soft rock in the upper mantle just below the lithosphere. It is involved in plate movement. Depth is 70 to 100 km below the surface.

n: see derrickhand.

a person that works in the derrick and assists handling pipe to make up joints into the string or stand them in the derrick when breaking out joints.

n: the name used for the working platform of the derrickhand (the monkeyboard) when it is located at a height in the derrick or mast equal to two lengths of pipe joined together. Compare fourble board, thribble board.

n: the platform on which the grabber works


working platform for the derrickman on a drilling rig.

n: The men required to operate the drilling rig on one shift or tour. This normally comprises a driller, derrickman and two or three roughnecks.

Perfluoroelastomers (KalrezTM, ChemrazTM, etc.).

fluoro-elastomers (VitonTM, FluorelTM, etc.).

n: the name used for the working platform of the derrickman. or the monkeyboard. when it is located at a height in the derrick equal to approximately four lengths of pipe joined together. Compare double board, thribble board.

n: the hight of eighty board is the four drill pipeshight.

n: the increase in the temperature of the earth with increasing depth. It averages about 1�F per 60 feet (1�C per 18.3 metres),but may be considerably higher or lower.

n: 1.The rate of increase in temperature per unit depth in the Earth. Although the geothermal gradient varies from place to place, it averages 25 to 30 oC/km [15 oF/1000 ft]. 2.The natural increase of temperature with depth in the earth. Temperature gradient

the gradient reflecting the amount of temperature rise as the well depth increases. Normally about 1.1 to 1.8o F per 100 ft of true vertical depth increase.

a safety slide or a line from the derrickman’s platform to the ground, used in an emergency.