| 摘要 |
A durable blast joint using a protective sheath of erosion resistant rings arranged in overlapping stacks so as to provide a vertically continuous protective sheath for the full length of the blast joint. The blast joint provides durable structural surfaces suitable for gripping with power tools and has a pressure operated hydrostatic driver for maintaining a tight fit between a continuous series of erosion resistant rings. The blast joint is also adaptable to be installed in a pressurized well, using a snubber unit.
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