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Oil & gas

Terms concerning oil and gas as a fossil fuel and natural resource.

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Oil & gas > Oilfield

principal axis

Oil & gas; Oilfield

The axis along which the data in n-dimensional space is primarily distributed. In two dimensions, the first principal axis is the semimajor axis of the ellipse that best fits the ...

logarithmic mean

Oil & gas; Oilfield

The average value of a set of measurements, calculated by taking the logarithms of the measurements, finding the arithmetic average of the logarithms and then taking the ...

shale baseline

Oil & gas; Oilfield

The average reading of the spontaneous potential (SP) log opposite the shale layers in a well. Opposite shales, the SP is relatively constant and changes only slowly with depth. ...

interpolation

Oil & gas; Oilfield

The assignment of values to points intermediate to two data points. Linear interpolation plots values along a straight line between the values of the two nearest data points. ...

levelwind

Oil & gas; Oilfield

The assembly on a coiled tubing reel that guides the tubing string onto the drum. Accurate spooling is necessary to avoid damaging the tubing and to ensure that the entire string ...

pump manifold

Oil & gas; Oilfield

The arrangement of lines and valves used to direct and control fluid on a pumping unit. The manifold on the pump suction is generally known as the inlet or low-pressure manifold. ...

damaged zone

Oil & gas; Oilfield

The area surrounding the wellbore that has been harmed by the drilling process, generally as a result of mud or cement-filtrate invasion. Near-wellbore damage can significantly ...