a. The load, expressed in pounds or tons, applied to a bit or other cutting tool while drilling. Long
b. The pressure, expressed in pounds per square inch, produced at the bottom of a borehole by the weight of the column of circulation or other liquid in a borehole. Long
c. The pressure, expressed in pounds per square inch, exerted by gas or liquids ejected from the rocks at or near the bottom of a drill hole. Long
d. Pressure measured in a well opposite the producing formation. If the well is flowing, the flowing bottom-hole pressure will be obtained; if the well is not producing and has not been producing for a sufficient time, the pressure will be the fully built-up, or static, bottom-hole pressure. CF: ground pressure
Source:
Dictionary of Mining, Mineral, and Related Terms












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