PLUG FOR WELL LOGGING OPERATIONS

摘要

A logging plug (50) for suspension on a wireline (34) comprises a hollow body (52) provided with packers (54) for sealing it to a nipple included in a tubing string, and a flow tube (62) through which the line (34) may slide with minimal leakage. An equalising tube (66) in the lower position shown blocks communication across the packers (54). When moved upwards by striking it with a hammer (80), communication is allowed via ports (56, 74), the annular passage (68), port (76), and bore (65). Any pressure differential across the packers (54) is thus equalised, allowing the logging plug (50) to be easily withdrawn.