Coring is the removal of a cylinder of material from a wellbore. It is the only mean of obtaining high quality samples for the direct measurement of rock and reservoir properties that cannot be addressed by other data sources.
To the extent possible, core samples are taken in an undamaged, physically unaltered state. The sample formation material extracted may be solid rock, friable rock, conglomerates, unconsolidated sands, coal, shale, gumbos or clays.
Cores provide both geological and engineering information, and their analysis leads to a profitable field development
NDD is also used Drilling motors to provide superior performance when drilling vertical holes in rotary drilling mode or over extended vertical drilling intervalsin deviated holes. The term “performance drilling” has been developed to describe drilling using a stabilized motor with a bottom hole assembly (BHA) configured for stabilizers similar to rotary drilling for deviation control. When drilling conditions require, the rotary can be engaged to increase bit speed to optimize performance.
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