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Glossary:Backreaming
Backreaming is the practice of pumping and rotating the drillstring while simultaneously pulling out of the hole. When reliable topdrive drilling systems (TDSs) on conventional drilling rigs were introduced more than 25 years ago, the practice of backreaming became a popular technique in the driller's toolbox for tripping out of hole initially in deviated wells.
Noteworthy papers in OnePetro
Yarim, G., Ritchie, G. M., & May, R. B. (2010, March 1). A Guide to Successful Backreaming: Real-Time Case Histories. Society of Petroleum Engineers. http://dx.doi.org/10.2118/116555-PA