underbalanced
- adjective
- Specialized
:
desbalanceado
- The direction of fluid flow during underbalanced drilling is from the formation into the borehole instead of into the formation from the borehole.
- underbalanced drilling
Examples
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One advantage sought with underbalanced drilling is a higher rate of penetration and, thus, less drilling costs.
Academic text (1991) -
The tool pusher and driller would be very aware of how critical confidence in the neg test is, especially when displacing the well to an underbalanced state.
Blog text (14) -
Clearly, the benefits of underbalanced drilling are accompanied by a higher hazard of the occurrence of the one event every driller guards against most avidly.
Academic text (1991) -
There is a downside to this largesse, however, plainly evident in the following two quotations about underbalanced drilling:
Academic text (1991) -
Many people having no well-drilling experience are saying the same thing: it was incredibly irresponsible to rely on a statistically iffy cement job as the only mechanical barrier between them and 12,000 psi gas and oil while knowingly putting the well in an underbalanced state and planning to leave it that way through subsequent operations.
Blog text (14) -
One advantage sought with underbalanced drilling is a higher rate of penetration and, thus, less drilling costs.
-
The direction of fluid flow during underbalanced drilling is from the formation into the borehole instead of into the formation from the borehole.
-
Clearly, the benefits of underbalanced drilling are accompanied by a higher hazard of the occurrence of the one event every driller guards against most avidly.
Surface Forms
Morphology
Etymology
Underbalanced is made of under ('below' or 'not enough') and balance ('equal pressure or stability'), so it means the pressure or balance is kept lower than the rock around it. That's why in underbalanced drilling the hole has less pressure than the surrounding rock to reduce damage and help fluids flow.
