LACT unit

An automated system for measuring and transferring oil from a lease gathering system into a pipeline. See lease automatic custody transfer.

Lagging

Insulation material which is a bad conductor of heat used to cover pipes, reactors, boilers, etc., to reduce loss of heat.

Landed price

The actual cost of oil to a refiner, taking into account all costs from the place of production or purchase to the refinery.

Landing nipple

Internally profiled tubing nipple with locking and locating recesses and a polished bore in which a mandrel can, by wireline method, be landed, locked and sealed.

Laser

Light amplification by stimulated emission of radiation. A device that produces an intense beam of monochromatic, spatially coherent light.

LAT

Lowest Astronomical Tide (Datum).

Latch on

To attach elevators to a section of drill pipe.

Latent heat

The amount of heat required to change the state of unit mass of a substance from solid to liquid or liquid to gas without any change in temperature; e.g., the latent heat of fusion of ice is 80 cal/g and the Jatent heat of vapourisation of water is 540 cal/g.

Laterolog

A formation resistivity measuring device utilising electrodes to focus a direct current into the formation. Knowing voltage, resistivity can be computed. It is best suited for measuring formation resistivity in wells drilled with more saline drilling muds.

Latitude (astronomical)

Angular distance between the direction of gravity and the plane of the Equator. Astronomical latitude is the latitude which results directly from observations on celestial bodies, uncorrected for deflection of the vertical.

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