| 21. | Behind this would be a selection of drill collars and Heavy Weight Drill Pipe ( HWDP ).
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| 22. | No water rushed up, and the miners quickly tapped on the drill pipe to signal their survival.
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| 23. | To "'make a connection "'is to add another segment of drill pipe onto the top the drill string.
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| 24. | The company makes drill pipe, casing and tubing for oil wells and pumping units used on offshore wells.
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| 25. | The drill pipe operations were regrouped under the name VAM Drilling, and in 2013 renamed Vallourec Drilling Products.
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| 26. | Electronic instrumentation similar to the spherometer in design are modified at inspection plants for casing, tubing, and drill pipe.
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| 27. | The process of inspections are designed to remove weakened drill pipe, so that pipe will not fracture during drilling.
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| 28. | Extracted through the long drill pipe will be cores of rocky material some 2 inches wide and 30 feet long.
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| 29. | At first, loggers had to run their tools somehow attached to the drill pipe if the well was not vertical.
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| 30. | In modern rotary drilling, mud is circulated down the drill pipe and back up the well bore to the surface.
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