While-drilling reversing device
The utility model relates to the technical field of drilling operation equipment. The device is a while-drilling reversing device. The device comprises an inverted pup joint, a leaking stoppage pup joint, a spring, a piston and an inverted part, the lower portion of the leaking stoppage pup joint is...
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Main Authors | , , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
21.02.2020
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Subjects | |
Online Access | Get full text |
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