ngth after the abrasion of the 51/2FH-72 drill pipe influencing factor Рshowed that the drill pipe and its joint were characterized by Рeven abrasion, the stress peak value was relatively high after Hu Jiangming(Research Institute of Oil Production Рone-side and two-side eccentric wear, the corresponding Technology, Jilin Oilfield, Songyuan City, Jilin Province), Рresidual strength of the drill pipe joint decreased fast and the Wang Nan, Xu Baihua. A new-type fisher characterized by Рresidual strength of the drill pipe decreased more severely than simultaneous fishing and flow metering. CPM, 2011, 39(3): Рthe joint’s residual strength. It was suggested that oilfields 43-44 Рstrengthen the management of drilling tools and work out the In light of the great difficulty, long cycle and low Р 2
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