Casing can be “floated” into the hole, relieving much of the weight on the rig.
This is done with a float shoe, which acts as a check valve at the bottom of
the casing, and allows the volume inside to displace enough fluid to balance part
of the weight.
No
company really wants to kill itself, though they have devised endless policies
and practices that make it likely to happen. Here are some of those actions
that routinely take place in the ordinary course of business to spell doom for
that business over time.
Phase
converters come in various shapes and sizes, costing from a few hundred dollars
to many thousands, depending on the horsepower rating and type. The phase
converter will artificially generate the third leg of a three-phase system from
the two leads of a single-phase system.
The
last two articles in this series on electricity focused on single-phase pumped
water systems. This article will be the first of several on three-phase
systems.
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