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Hydrofracture
| Глоссарий по проходческим щитам (тоннелингу) |
- A special form of inadvertent return in which drilling fluid reaches the surface or waterway. also called a frac-out.
- The inadvertent loss of drilling fluid from the borehole annulus to the surrounding soil as a result of excess downhole fluid pressure.
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Inadvertent, английский
Небрежный, неумышленный.
Surrounding, английский
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Top hat, английский
A steel can with a faceplate bolted to a reception shaft wall to receive the arriving mtbm.
Mixed reach, английский
A significant change in ground type, characteristics, or behavior along the excavated tunnel between the jacking and receiving shafts. this term is not currently defined by astm or uscs.
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