Page 511 - Practical Well Planning and Drilling Manual

Appendix NEW! revised 11/00/bc 1/30/01 3:30 PM Page 487

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Glossary

Mechanical Sidewall Coring Tool. Schlumberger wireline tool that
recovers either 20 or 50 core plug samples in one trip. The cores are
cut with a special core bit and barrel driven by an electric motor.
Useful to recover high quality core plugs without the damage that
explosive core sampling causes. See also CST.

Mesh. A measure of fineness of a woven material, screen or sieve,
e.g., a 200 mesh sieve has 200 opening per linear inch. A 200-mesh
screen with a wire diameter of 0.0021 in (0.0533 mm) has an opening
of .074 mm, or will pass a particle of 74 microns. See also Micron.

Mica. A naturally occurring flake material of varying size used in
combatting lost circulation. Chemically, an alkali aluminum silicate.

Micron. A unit of length equal to one millionth part of a meter, or
one thousandth part of a millimeter.

Milliliter. A metric system unit for the measure of volume. Literally
1/1000th of a liter. In drilling-mud analysis work, this term is used
interchangeably with cubic centimeter (cc). One quart is about equal
to 946 ml.

Modular Formation Dynamics Tester. Schlumberger wireline tool
that allows pressure testing and sampling of formation fluids by a
probe which seals against the wellbore. Sample chambers are avail-
able in three sizes and many pressure tests can be made in a single
trip. Used for anisotropic permeability estimates, pressure gradients,
and PVT testing.

Molecular Weight. The sum of the atomic weights of all the con-
stituent atoms in the molecule of an element of compound.

Monkey Board. A platform on which the derrickman works during
the time the crew is making a trip.

Monobore Completion. A well completion design where the com-
pleted interval can be accessed at its full bore by wireline or coiled
tubing tools. Advantages include smaller hole sizes can be drilled and
the entire completion can be accessed by wireline tools or coiled tub-

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