Need help with Cementing calculations, to be pointed in the right direction

$$ Open hole $171/2$

$$ Bottom hole temperature is $260\backslash$deg F

$$ Surface casing is $2054\mathrm{.}5$ ppf K$55$ STC set at $1500$ feet

$$ Casing is $13-3/8775$ ppf P$110$ LTC set to $7100$ feet run as follows:

$13-3/8$ float shoe

$2$ jts $(60$ shoe track$)$ of $9-5/853\mathrm{.}5$ ppf P$-110$ LTC casing

$13-3/8$ float collar

$7100$ of $133/853\mathrm{.}5$ ppf P$-110$ LTC casing back to surface

$$ Lead cement $($all of this cement is in the annulus$)$

$$ Class $$G$+8\%$ bentonite

$$ Density : $13\mathrm{.}3$ ppg

$$ Yield : $1\mathrm{.}83$ ft$3/$sk

$$ Mixwater Requirements : $1\mathrm{.}307$ ft$3/$sk

$$ TOLC outside $133/8"$ casing: $3950\text{'}$ above shoe

$$ Tail cement $-($note: part of the tail cement is in the $13-3/8$ casing and some of it is in the annulus.$)$

$$ Class G cement with the following additives:

$0\mathrm{.}2\%$ D$13$R $($retarder$)$

$1\%$ D$65($friction reducer$)$

$$ Slurry density $=15\mathrm{.}9$ ppg

$$ Yield $=1\mathrm{.}14$ ft$3/$sk

$$ Mixwater requirements $=4\mathrm{.}96$ gal per sk

TOTC outside $133/8"$ casing: $1800\text{'}$ above shoe

$$ Precede cement with $17$ bbls of $10\mathrm{.}2$ ppg brine as a spacer.

$$ Use $20\%$ excess for determination of cement volumes.

VOLUMETRIC CAPACITIES

Casing

$133/8"77$ lb$/$ft : $0\mathrm{.}1463$ bbls$/$ft $=0\mathrm{.}8215$ ft$3/$ft

Annular Spaces

$171/2"$ hole x $133/8"$ Casing: $0\mathrm{.}1237$ bbls$/$ft $=0\mathrm{.}6946$ ft$3/$ft

$20"$ Casing x $133/8"$ Casing: $0\mathrm{.}1816$ bbls$/$ft $=1\mathrm{.}0194$ ft$3/$ft

To be determined:

$1.$ The volume of cement

$2.$ The required number of sacks of cement

$3.$ The volume of mixwater required

$4.$ The volume of displacement

$5.$ Top of the spacer

$6.$ Hydrostatic pressure generated during the cementing operations at the bottomhole

$7.$ How long does it take to pump all the cement $($only$)$ at $6$ bpm$?($mins$)$