Magma

Molten material originating from deep within the Earth's crust; the material from which igneous rocks form.

Magnetic brake

Also called an electrodynamic brake. See electrodynamic brake.

Magnetic survey

This measures variations in the Earth's magnetic field caused by the presence of rock structures and is used to detect sedimentary areas. This type of survey is usually carried out by air.

Magnetometer

Towed sensor for detection of sea-bed or buried ferrous masses (e.g. pipelines, anchors, wreckers).

Magnetometer survey

A geological survey method in which sedimentary basins are identified and their size determined by measuring the magnetic properties of the underlying igneous rocks.

Make hole

To deepen the hole made by the bit; to drill ahead.

Make up

1. To assemble and join parts to form a complete unit (as to make up a string of casing). 2. To screw together two threaded pieces. 3. To mix or prepare (as to make up a tank of mud). 4. To compensate for (as to make up for lost time).

Make up cathead

A device attached to the shaft of the drawworks that is used as a power source for screwing together joints of pipe; usually located on the driller's side of the drawworks. See cathead.

Make up torque

The power necessary to screw a joint of pipe into another sufficiently tight to hold and seal and not loosen under working conditions.

Making a connection

The act of screwing a length of drill pipe onto a drill string suspended in a well bore, i.e. lengthening the drill string by one section of pipe during a drilling operation.

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