A rig with $1000$ HP input power uses a drill line with a maximum tension load$-$bearing

capacity of $60,000$ lbf$.$

a$)$ What is hoisting? Also, name two well construction activities where hoisting is required?

b$)$ Calculate the expected velocity $($in $f\frac{t}{s})$ of the fast line if the rig is pulling $90\%$ of the

maximum allowable load with $10$ lines.

$4.$

One tripping scenario has the rig of problem $(3)$ pulling a simple drillstring made up of

$6,650ft$ of $19\mathrm{.}5l\frac{b}{f}t$ drillpipe from bottom in $11\mathrm{.}0$ ppg mud.

a$)$ Briefly explain why the weight indicator will show a lower value when the drillstring is

suspended in $11$ ppg mud than when it would be suspended in air.

b$)$ When the rig is pulling on $12$ lines, calculate the load that is shared by derrick legs C & D $($in

lbf$)$ and the expected velocity $($in $f\frac{t}{m}in)$ of the block while assuming only $50\%$ of the drawworks

input power given in problem $(3)$ is used.