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- ...ll string and bit. The ''drill string'' refers to the combination of drill pipe, collars, and other bottom hole assembly components. (For more information ...ipe and lowered into the hole so that drilling can resume. When all of the pipe is pulled out of the hole, it is referred to as a ''trip''. Pulling out par12 KB (2,020 words) - 16:19, 20 January 2022