Since well logging always needs entering the earth as deeper as possible to get the
characterization of wells, high-performance logging facility is required, and it should be
heavy and firmer enough, so as to balance out much more upward resistance and enhance
the downward impulse force. In fact, it should just work as counterweight for the whole
part.
Tungsten heavy alloy (WHA) is an excellent casing material for down-hole logging of oil
wells. Casings must be sufficiently heavy to readily sink through materials such as barite
mud and strong enough to withstand the hydrostatic pressure of this harsh environment.
Most designs are highly machined for sensor and window positioning. Mechanical
properties are very significant to the survivability of these rather large components.
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