1 A driller is pulling on a stuck drillstring. The derrick is capable of support

Question

1 A driller is pulling on a stuck drillstring. The derrick is capable of supporting a maximum equivalent derrick load of 600,000 lbf. Ten lines are strung between the crown block and traveling block (E 0.810) A safety factor of 1.8 is required for the derrick loading. (5 points) How hard can the driller pull to free the stuck pipe based on the derrick rating? lbf 2 A driller is pulling on a stuck drilltring. The drillpipe is rated to 328,000 lbf in tension. Ten lines are strung between the crown block and traveling block (E 0.810) A safety factor of 2 is required for the drillpipe. How hard can the driller pull to free the stuck pipe based on the drillpipe rating? (5 points) lbf 3 A driller is pulling on a stuck drillstring. The driling line is rated to 41,200 lbf. Ten lines are strung between the crown block and traveling block(E 0.810) A safety factor of 1.9 is required for the drilling line. How hard can the driller pull to free the stuck pipe based on the drilling line rating? (5 points) lbf 4 If questions 1-3 are based on the same rig system, what is the maximum allowable pull to free the drill string? (5 points) lbf

Explanation / Answer

Maximum equivalent derrick load, Fde =600,000 lbf

Number of lines, n =10

Efficiency,E =0.810

Safety factor=1.8

By Considering Maximum derrick calculate the Hoist load, W1

Hoist load, W1 = Fde*n/(n+4) = 60,000 * 10/14 = 428571.42857lbf

For the safety factor of 1.8, Pull applied by the driller

Pull = 428571.42857/1.8

Pull =238095.238 lbf  Tension in fast line, Ff = pull/efficiency*n =238095.238/0.810*10 =29394.473838 lbf

As per Chegg Guidelines I am asnwering only First question

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