Thousands of boreholes are drilled every year in the search for fossil fuels and mineral
resources. They vary in depth from a few metres to several thousand metres, and vary
in diameter from a few tens of millimetres to several hundred millimetres. They also
vary in orientation from vertically down to vertically up, some being horizontal and
some having complex trajectories. Some are smooth with circular cross sections,
others are rugose with non-circular or irregular sections. And some contain air or gas,
whilst others are filled with liquids ranging from clear, fresh water to heavy, saline
drilling muds.
Thousands of boreholes are drilled every year in the search for fossil fuels and mineral
resources. They vary in depth from a few metres to several thousand metres, and vary
in diameter from a few tens of millimetres to several hundred millimetres. They also
vary in orientation from vertically down to vertically up, some being horizontal and
some having complex trajectories. Some are smooth with circular cross sections,
others are rugose with non-circular or irregular sections. And some contain air or gas,
whilst others are filled with liquids ranging from clear, fresh water to heavy, saline
drilling muds.
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