دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: wave in an elastic medium that causes an element of the medium to change volume without rotating.

n: Press the cylindrical core sample put between the teeterboards of compression testing machine with axial force till breakdown. Records the alternation value of stress and deflection and draw the curve and requires compressive resistance of the rock.

n: a device that raises the pressure of a compressible fluid such as air or gas. Compressors create a pressure differential to move or compress a vapour or a gas, consuming power in the process. They may be positive-displacement compressors or nonpositive-displacement compressors. See centrifugal compressor;jet compressor;reciprocating compressor.

a type of pump that increases the pressure of gas. Commonly used as a production rate increaser by increasing the gas pressure delivered from low pressure gas wells to enter the pipe line. The intake into the compressor lowers the wellhead pressure creati

n: the ratio of the volume remaining in a compressor cylinder at the end of a compression stroke to the volume displaced by one stroke of the piston. Usually expressed as a percentage.

n: a device in a compressor that closes while gas is being compressed and opens to allow the compressed gas to discharge and uncompressed gas to be drawn in.

n: a reaction in which gamma rays with intermediate energy levels (0.6 to 2.5 million electron volts) lose their energy by colliding with orbital electrons.

n: a rigid offshore drilling platform built of steelreinforced concrete and used to drill development wens. The platform is floated to the drilling site in a vertical position. At the site, one or more tall caissons that serve as the foundation of the platform are flooded so that the platform comes to rest on bottom. Because of the enormous weight of the platform, the force of gravity alone keeps it in place. See platform rig.

n: (CIDS) a structure made primarily of concrete which is designed for drilling in arctic waters. The structure is very strong and is de- signed to withstand the great force of moving ice.

n: a light hydrocarbon liquid obtained by condensation of hydrocarbon vapours. It consists of varying proportions of butane, propane, pentane, and heavier fractions, with little or no methane or ethane.

the part of the hydrocarbon stream that is a vapor in the formation and condenses to a liquid after being cooled. Normally the volatile condensate has a composition of C5 to C8 and an API gravity of >40.

a relative permeability effect where condensate, usually hydrocarbon, drops out of the vapor phase around the wellbore when the pressure drops below the dew point in response to drawdown or depletion. Gas rates can be severely reduced by the permeability