P R O D U C T O N C A S I N G D E SI G N rev 2.3 11-1988

Well Name: Nefertiti-3XCasing depth: 17100 ft Casing Type: Inter/Prod

Date: 26-Sep-10 Casing: 9.625", 53.5 ppfEngineer: DT L80, BTC

Remarks:

I N P U T D A T A

TVD top of payzone 12,064 ftTemp.-gradient 1.55 °F/100'Surface temperature 75 °FPacker fluid weight 9.00 ppgTVD of production packer 11,600 ftLast casing-shoe TVD 9,715 ftPore pressure in payzone 9.00 ppgPore pressure @ last csg-shoe 9.00 ppgPore pressure @ csg-shoe 9.50 ppgBackup weight above last csg.-shoe (gen. 9.0 ppg water ) 10.00 ppgBackup weight @ prod. packer depth (Pore pres. or water) 10.00 ppg

Top casing TVD 40 ftTop casing MD 40 ftCasing-shoe TVD 9,968 ftCasing-shoe MD 17,100 ft

Casing OD (in decimal no.) 9.625 inCasing ID (in decimal no.) 8.535 inMin. yield-strength of material 80,000 psiLesser of internal yield pressure or leak resistance 7,930 psiCollapse resistance 6,620 psiPipe body yield strength 1,286,000 lbsJoint strength 1,047,000 lbsActual weight of casing 53.50 lbs/ft

Max. Dogleg severity 1.50 °/100'@ depth 13,100 ft

Mud weight when TIH csg. 11.00 ppgWeight of cement-displacing fluid 11.00 ppgTop of lead-cement TVD 6,700 ftTop of tail cement TVD (=csg-shoe TVD, if n/a) 9,275 ftWeight of lead-cement 14.00 ppgWeight of tail cement (= 0 if n/a) 16.00 ppg

E N D O F I N P U T D A T A S H E E T

Z FACTOR CALCULATIONS D = 0.015773927E = 1.35944E-10

A = 0.651456945 F = 4.6118E-07B = 0.050382797 AA = 1.654169661C = 0.06398939 Z FACTOR = 1.141889228

Well name: Nefertiti-3XCasing depth: 17100 Casing type: Inter/Prod

Date: 26-Sep-10 Casing: 9.625", 53.5 ppfEngineer: DT L80, BTC

BURST CALCULATIONS

12,064 : TVD payzone, ft 40 : depth of csg-top TVD, ft9.00 : Pore pressure, ppg 19 : Pkr Fld Load @ top of csg., psi1.55 : Temp grad, °F/100' 4,807 : SITP + Pkr Fld Load, psi

75 : Surface temperature, °F 10.00 : Backup, ppg9.00 : Packer fluid wght, ppg 21 : Backup, psi

7,930 : Int. yield or leak resist., psi 4,786 : [SITP + Pkr Fld] - Backup, psi5,646 : BHP, psi

262 : BHT, °F8.41 : P red2.10 : T red 11,600 : depth of prod-packer TVD, ft

1.142 : Z -Factor 5,429 : Pkr fld load @ packer, psi10,217 : SITP + Pkr fld load, psi

SITP 10.00 : Backup wt @packer,ppg0.071 : Gas Grad (psi/ft) 6,032 : Backup, psi

857 : P hyd. Gas 4,185 : [SITP+Pkr Fld]-Backup, psi4,788 : SITP = (P pay. - P hyd.)

9,968 : csg-shoe, TVD, ft 11,601 : depth 1ft below packer TVD, ft 4,665 : Pkr fld load @ csg-shoe, psi none : Pkr fld load, psi9,454 : SITP+packer fluid load, psi 5,646 : Bottom hole pressure, psi

0 : Burst ld. by bot. hole pre. ps 10.00 : Backup @ prod. packer+1ft, ppg 9.00 : Backup gradient, ppg 6,033 : Backup, psi

4,665 : Backup, psi -420 : Bottom hole pres.-gas grad.4,788 : burst load - backup, psi -backup, psi

9,715 : last csg-shoe, TVD, ft 9,716 : 1 ft below last csg-shoe4,547 : Pkr fld load @ last csg-shoe, 4,547 : Pkr fld load @ 1' bel. last csg-shoe, psi5,479 : Bottom hole pres.-gas grad., 5,479 : Bottom hole pres.-gas grad., psi9,335 : SITP + pkr fld load, psi 9,335 : SITP + pkr fld load, psi10.00 : Backup, ppg 9.00 : Backup, ppg5,052 : Backup, psi 4,547 : Backup, psi4,283 : burst load - backup, psi 4,788 : burst load - backup, psi

@ Depth Burst-Load Int. Yield D.F.ft psi psi

@ surface 0 4,788 7,930 1.66@ csg.top TVD 40 4,786 7,930 1.66

@ last csg-shoe TVD 9715 4,283 7,930 1.851ft below last csg-shoe 9716 4,788 7,930 1.66

@ packer depth TVD 11600 4,185 7,930 1.891 ft under packer 11601 -420 7,930 999.00@ csg. shoe TVD 9968 4,788 7,930 1.66

The design-factors have to be ≥ 1.25

Well Name: Nefertiti-3XCasing depth: 17,100 Casing Type: Inter/Prod

Date: 26-Sep-10 Casing: 9.625", 53.5 ppfEngineer: DT L80, BTC

TENSION CALCULATIONS

40 : Csg top, MD, ft 9.63 : OD, in9,968 : Casing shoe, TVD, ft 8.54 : ID, in

17,100 : Casing shoe, MD, ft 1.50 : Dogleg sev., °F/100ft11.00 : Mud weight, ppg 13,100 : @ depth, ft53.50 : Casing wt, lbs/ft 178,034 : Tension in dogl., lbs

1,286,000 : Pipe body yield str., lbs 1.4744 : x for bend. force calculation1,047,000 : Joint strength, lbs 0.9004 : tanh (x)

SOLUTION:

.832 : Buoyancy factor759,313 : Pipe weight in mud, lbs considers MD for liners and TVD for casings

1.69 : Pipe body design factor1.38 : Connection design fact.

The design factors have to be ≥1.6

Axial force due to bending (Fb) x / tanhx = 1.64Considering couplings contact only (conservative). Stress concentration factor

(Stress is 64 %79,204 : Bending force, lbs: higher than in continuous

257,237 : Total tension, lbs: wall contact calculation. )

5.00 : Design factor pipe body4.07 : Design factor pipe joint

The design factors have to be ≥1.6

Well name: Nefertiti-3X Casing type: Inter/ProdCasing depth: 17100 Casing: 9.625", 53.5 ppf

Date: 26-Sep-10 L80, BTCEngineer: DT

COLLAPSE LOAD CALCULATIONS

12,064 : TVD of payzone, ft 9.00 : Pore pressure @ last csg-shoe40 : Top of csg ,TVD, ft 9.50 : Pore pressure @ csg-shoe40 : Top of csg, MD, ft 6,700 : Top of lead-cement, TVD, ft

9,968 : Csg -shoe, TVD, ft 9,275 : Top of tail-cement, TVD, ft 17,100 : Csg-shoe, MD, ft ( = csg-shoe TVD, if n/a)80,000 : Min. yield str. of csg., psi 7,825 : Length of tail cement-column, ft

6,620 : Collapse resistance, psi 2,575 : Lenght of lead cement-column, ft15.547 : Pipe end area, sqin 11.00 : Weight of displacing fluid, ppg

9,715 : Last casing shoe, TVD, ft 14.00 : Weight of lead-cement, ppg16.00 : Weight of tail-cement, ppg

C0LLAPSE RATING CALCULATION

Effective load @ top of casing 824,068 lbs csg weight - Effective load @ shoe of casing -88,642 lbs (Phydr. * Pipe area)(negative load indicates compression)

Biaxial load effect downgrading @ top #DIV/0! % ratio of eff. coll. resistanceBiaxial load effect upgrading @ shoe #DIV/0! % to nominal coll. resistance

Eff. collapse-resistance @ top of csg #DIV/0! psiEff. collapse-resistance @ csg-shoe #DIV/0! psi(calculated acc. API Bul 5C3, no down/upgrading, if D/t ratio > 20)

@ depth Coll.-load Backup Eff. col. load Col. Rtg Design factorft psi psi psi psi

Top Csg, TVD 40 20 0 20 #DIV/0! #DIV/0!Last shoe TVD 9,715 4,547 0 4,547 #DIV/0! #DIV/0!Csg-shoe, TVD 9,968 4,924 0 4,924 #DIV/0! #DIV/0!

Ppore * depth The design factors have to be ≥ 1.0Abandonment pressure is not to be considered. Backup is always "0"

WHILE CEMENTING THE CASING:@ depth Coll.-load Backup Eff. col.load Col. Rtg Design factor

ft psi psi psi psiTop casing 40 0 0 0 #DIV/0! 999.00

Top lead cmt 6,700 3,310 3,310 0 #DIV/0! 999.00op Tail ct TVD 9,275 5,184 5,305 -121 #DIV/0! 999.00Csg-shoe TVD 9,968 5,761 5,702 59 #DIV/0! #DIV/0!

slurry wt * depth The design factors have to be ≥ 1.0mud wt * depth

PRINT PAGE 1 - 4 at 90% page size

considers MD for liners and TVD for casings

% ratio of eff. coll. resistance Collapse Rating calculations acc. API Bul 5C3 and Biaxial% to nominal coll. resistance

#DIV/0! : D/t 53007 : Stress, Sa (psi) @ csg top80000 psi : Yp (min. yield) -5702 : Stress, Sa (psi) @ csg shoe

Sa, psi Ypa, psi A B C F G (D/t)yp (D/t)pt0 80000 3.071 0.0667 1955 1.998 0.0434 13.38 22.47

Design factor 53007 39016 2.947 0.0460 725 2.073 0.0323 16.55 27.15-5702 82698 3.080 0.0681 2036 2.002 0.0443 13.28 22.25

Design factor

#DIV/0!Results acc.

orAPI 5C3 BIAXIAL

(D/t)te Pyp Pp Pt Pe Pc Pc %error AQ31.02 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!43.07 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!30.49 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!

BQ CQ#DIV/0! -1#DIV/0! -0.561#DIV/0! -0.9949