Rig Design

DERRICK LOADING DERRICK LOADING WORST CASE 1 Worst case would be running heaviest casing string (9-7/8" casing= at section TD and applying maximum overpull I.e. 100 K lbs

108000 Klbs) getting stuck

2 Assuming all 5" drillpipe has been picked up to drill to TD Block weight + top drive and hoisting equipment =

25000 lbs

Pipe in Derrick BHA (DC + HWDP) 6.5" DC 5" HWDP

540 ft x 99 lb/ft = 360 ft x 53.7 lb/ft =

5940 lbs 51552 lbs

8500 ft x 19.5 lb/ft =

165750 lbs

DP 5" DP

Pipe weight in derrick =

223,242 lbs

Casing Stuck 10200 ft x 66.9 lb/ft = Overpull applied Design 100,000 lbs Block and Travelling weight

(A)

108000 lbs 100000 lbs 25000 lbs

Stuck casing load on derrick

233,000 lbs

(B)

Worst Case Derrick Load

456,242 lbs

(A) + (B)

DYNAMIC DERRICK LOADING FOR WORST CASE Dynamic derrick load (12 lines run blocks) Hook line load (HL) = Casing wt + OP + block wt Fast Line Load (FL) = HI/(No. lines x SF) Deadline Load (Dl) = Hl/(No. of Line)

Vl 233,000 lbs

(A)

24,829.50 lbs

(B)

19,417 lbs

Dynamic Derrcik load=A + B + C

277,246 lbs

Derrick load Static =

271,833 lbs

((n) + 2/(n))*Hl

C

Draworks requirements The operator would like to trip with a minimum speed of 50 ft/min at the highest loading conditions Fast line speed =

(n) x speed required ft/min =12 lines x 50 ft/min Vf

600 ft/min

For a 60" drum (1.25 ft radius = r)

HP

Velocity of the fast line Vf = 2 x phi x r x N 600 = 2 x 3.14 x 1.25 x N N=

76.43312102 revs/min

HP = (Fl x s x phi x r x N) / (33,000) HP =

451.45 HP

Assuming efficiencey 85% HP =

531.11 HP

MUD PUMP RATINGS Hydraulic Calculations for two critical hole cleaning sections ie the 17-1/2" hole and 12-1/4" Based on maximum section depth operating pressure of 3200 psi and 1200 GPM in the 17-1/2" section HHP = (P x V)/(1714 x 0.85 x 0.95) HHP =

2774.456

2 x 1300 HP pumps would be required Three pumps would be preffered to provide operational redundancy if one pump requires repair. ELEVATOR Maximum load is the heaviest casing 9-7/8"

108000 Lbs

or equal to

57754.0107 Ton

w/ SF 1.25

72192.51337 Ton

Choose

500 Ton