Engineering, 26.09.2019 22:10 dani6651
Adriller is pulling on a stuck drillstring. the derrick is capable of supporting a maximum equivalent derrick load of 5 lbf, the drilling line has a strength of 51200 lbf, and the strength of the drillpipe in tension is 396000 lbf. if eight lines are strung between the crown block and the travelling block and safety factor of 2.0 are required for the derrick, drillpipe and drilling line, how hard can the driller pull trying to free the stuck pipe?
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