CASE STUDY

Dan OpreaDirectional Driller

Well Data Country Field Formation Well Purpose Customer Well Name Well Classification : : : : : : : Qatar Al Shaheen Suaiba Development Maersk AA-22 Oil Well

Well Profile

:

Horizontal

Well Geometry Kick Off Point Vertical Section Total Depth TVD : : : : 1,602 feet MD 16,635 feet 19,283 feet MD 3,300 feet

Slot 22 May 30, 2002 Maersk Oil Qatar AS AA-22

Maersk Oil Qatar ASWELL

Well PlotsAL SHAHEENNorthing: Easting: Qatar, IGN Clarke, UTM 39 2941240.41 m 599605.69 m Grid Conv: Scale Fact:

AA-22Dip: Mag Dec: 40.694 +1.887 Date: FS: October 18, 2001 43690.9 nT

FIELD

STRUCTURE

Platform AATVD Ref: Srvy Date: RKB (136.00 ft above MSL) May 30, 2002

Magnetic Parameters Model: BGGM 2001

Surface Location Lat: N26 35 26.083 Lon: E52 0 1.006

+0.44777410 0.9997224892

Miscellaneous Slot: Slot 22 Plan: Gyro survey

-9000

0

3000

6000

9000

12000

15000

18000

-9000 -9000 18000

-6000

-3000

0

3000

6000

9000 18000

-6000

-6000 15000

AA-22 TD

15000

-3000

-3000 12000 12000

0

0>

9000

9000

3000

3000

6000

6000

6000

6000 3000 3000

9000

9000 0 0

12000

12000 -3000 0 3000 6000 9000 12000 15000 18000 -9000 -6000 -3000 0 3000 6000Drawn By: Date Created: Checked By: Checked Date: Approved By: Approved Date:

-3000 9000Current User May 30, 2002

Departure (ft) Azim = 13, Scale = 1:1447.71 Origin = 0 N/-S, 1.52818e-009 E/-W

>

ANTICOLISION ISSUESCollisions hazards made necessary to run anticollision against the wells reported as collisions hazards every survey in 16 section. The method used at customer request for anticollision alerts was MAC factor :

MAC=(Ct Ct EOU) + Hole radius + Casing radiusMAC factor = CtCt / MAC MAC factor should be bigger as 2.5 .

ANTI-COLLISION SUMMARY REPORTOffset Separation (ft) Trajectory Ct-Ct AA-17 Lower Lateral 10.78 11.83 15.98 10.42 10.42 10.42 86.49 1895.10 AA-17 Upper Lateral 10.78 11.83 15.98 10.42 10.42 10.42 86.49 AA-24 4.01 3215.32 AA-25 4.64 1.63 4.05 9.48 44.63 2285.74 EOU 4.75 4.95 0.07 -6.51 -6.51 -6.51 65.33 1820.93 4.75 4.95 0.07 -6.51 -6.51 -6.51 65.33 -0.90 3174.68 -0.65 -6.08 -4.57 0.38 34.30 2239.79 Sep. Fact. 1.79 1.72 1.00 0.62 0.62 0.62 4.09 25.55 1.79 1.72 1.00 0.62 0.62 0.62 4.09 0.82 79.11 0.88 0.21 0.47 1.04 4.32 49.73 Subject Trajectory MD (ft) TVD (ft) 800.00 900.00 2000.00 2100.00 2100.00 2100.00 2400.00 5300.00 800.00 900.00 2000.00 2100.00 2100.00 2100.00 2400.00 600.00 4400.00 600.00 900.00 1000.00 1100.00 1400.00 4400.00 799.88 899.71 1992.06 2086.11 2086.11 2086.11 2351.65 3255.42 799.88 899.71 1992.06 2086.11 2086.11 2086.11 2351.65 599.99 3247.24 599.99 899.71 999.46 1099.22 1398.58 3247.24 Separation Factor Alert Alert Minor Major Alert MinPt-EOU MinPt-SF Enter Minor Enter Major Exit Major Exit Minor Exit Alert MinPt-SF MinPt-EOU MinPt-SF Enter Minor Enter Major Exit Major Exit Minor Exit Alert Exit Alert MinPt-SF 1.00 1.00 1.50 5.00 Enter Major MinPts Exit Major Exit Minor Exit Alert MinPt-SF 1.50 1.00 1.00 1.50 5.00

1.50 1.00 1.00 1.50 5.00 5.00

SPIDER PLOT

SPIDER PLOT

Drilling problems

Mud Losses Unconsolidated formations Well flow H2S hazard

16 SectionObjectives: To kick off the well with 3.6 Degrees DLS and turn to 21 Deg Azm at TD. Results: The BHA reacted as expected and build about 3.5 deg/100 sliding and 1 deg/100 in rotary. Due to drilling without return the hole was subject to back reaming and washing all times which reduced build up rate in some areas.

BHA 1 16 Section16" Bit A962M5630SP (1.15 deg) Hughes Christensen Anadrill X 28 DF 1259

Float Sub8 1/4" Pony NMDC PowerPulse HF UBHO Sub

AnadrillAnadrill Anadrill Anadrill

VG3759SBM P 009-2 M325 A001

8" Non-Magnetic Drill Collar Anadrill8" Drill Collar (5 joints) Jar 8" Drill Collar (3 joints) Santa Fe 103 Anadrill Santa Fe 103

224291

3415

Crossover5" HWDP (15 joints)

Santa Fe 103Santa Fe 103

Hydraulics 1Company Name: Maersk Oil Qatar AS Field: AL SHAHEEN Structure: Platform AA Well: AA-22 Location: Borehole: AA-22 Operator: District: BHA Data: BHA1 Wellbore Data: WG Survey Data: Gyro survey Date: Flowrate: ECD at Bit: ECD at Shoe: User Depth: ECD at Depth: 1000 8.492 8.455 0.0 8.400 gal/min lbm/gal lbm/gal ft lbm/gal Mud Wt: PV: YP: K: n: Fann 3: Fann 6: Fann 100: Fann 200: Fann 300: Fann 600: Model: 8.400 15.0 31.0 1743.6 0.407 0.0 0.0 0.0 0.0 46.0 61.0 Power Law ft ft ft ft lbm/gal cP lbf/100ft2 eq.cP

lbf/100ft2 lbf/100ft2 lbf/100ft2 lbf/100ft2 lbf/100ft2 lbf/100ft2

Pressure Drop Summary Surf. Eqpt: 76 Inside Drillstr. 899 Tools: 290 Motor: 704 Bit Nozzles: 312 Annulus: 13 Chokeline: Hyd Imbalance: TOTAL: 2293

psi psi psi psi psi psi psi 0 psi

psi

Depth In: Depth Out: Bit TVD: Bit MD:

2724.9 2886.0

Bit Optimization Bit Flowrate: 1000 Jet Velocity: 203.8 Bit HSI: 0.91 Jet Imp.Force: 886.9 % Hyd Pow: 13.62 Borehole description

gal/min ft/s hp/in2 lbf

BHA Description Length ft 16" Bit + nozz 1.38 A962M5630SP 26.82 Float Sub 3.00 8 1/8" Pony NMDC 10.12 PowerPulse HF 27.55 UBHO Sub 2.54 8" Non-Mag DC 30.98 8" Drill Collar 153.23 Jar 31.78 8" Drill Collar 92.32 Crossover 2.81 5" HWDP 457.95 5" 19.50 DPG 2045.52 Element ID in 3.75 7.88 2.81 2.81 5.90 2.88 2.88 2.63 3.00 2.63 2.88 3.00 4.28 OD in 8.50 9.63 8.00 8.13 8.13 8.00 8.00 8.00 8.00 8.00 6.63 5.00 4.93 Cum Len ft 1.38 28.20 31.20 41.32 68.87 71.41 102.39 255.62 287.40 379.72 382.53 840.48 2886.00 Press Drop psi 312.6 703.5 2.4 8.2 289.7 1.9 23.0 167.4 19.7 100.9 2.1 284.1 288.5

Element 20" Casing Open Hole

Length ft 853.00 2033.00

ID in 18.81 16.00

Cum Len ft 853.00 2886.00

Hydraulics 2Bit Details Type: Insert Bit Diameter: 16.000 TFA: 1.574 Nozzles (1/32in) in in2 1x18, 3x24 Reamer Type: Diameter: TFA: 0.000 in Surface Equipment : 4 Length ft Standpipe: 45 Rotary Hose: 55 Swivel: 6 Kelly: 40 Effective: 340 Maximum WOB: Maximum Overpull: On-Bottom Pressure Drop: Off-Bottom Pressure Drop: Stall Nozzle Flowrate: Stall Motor Flowrate: Stall WOB: 230.3 Stall DTOR: 18426.1 Stall Pressure Drop: ID in 4.00 3.00 3.00 4.00 3.83 67.7 29.7 703.5 591.6 0.0 1000.0 1000 lbf ft.lbf 1327.9 1000 lbf 1000 lbf psi psi gal/min gal/min

Motor Details Motor: A962M5630SP Bearing Flow: 0 Wear: 0.0 Rotor Nozzle: 0 Min Flowrate: 600.0 Max Flowrate: 1200.0 Bearing Flowrate: 0.0 Nozzle Flowrate: 0.0 Motor Flowrate: 1000.0 Cuttings Cuttings Diameter: Cuttings Density: ROP: Cutt. Concentration: Bit ECD Increase: % % in/32 gal/min gal/min gal/min gal/min gal/min Hole Cleaning 0.20 2.60 40.0

Hydraulic Thrust: Bearing Capacity: On-Bottom RPM: WOB: DTOR: Delta P: Mechanical HP: Optimum HP: Efficiency:

19.0 1000 lbf 48.7 1000 lbf 111.3 35.0 2800.0 111.9 59.4 165.6 35.8 rpm 1000 ft.lbf psi hhp hhp %

lbf

psi

Flow below critical rate in RPM: g/cm3 Critical Rate: ft/h Annular Flow: % by Vol Critical MD: lbm/gal Hole Inclination:

60 1858.5 1000.0 2885 48

gal/min gal/min ft deg

Recommendations When no return starting mud pumps slowly helps to avoid charging the formation quickly with fluid and causing it to collapse.

Surveys to be taken before connection and 10 feet off bottom. BHA to contain the minimum number of stabilizers.

12 1/4 SectionObjectives: To drill 12 1/4" hole with 3.5 deg builds per 100'

Results: Unable to make build rates with the Power Drive. Pulled out of the hole and pick up a mud motor set at 1.50 degrees. Ran back in the hole and drilled to casing point with no problems landing the well where the geologist on site requested.

PowerDrive

MAP TABLE

BHA 2 12 Section12 1/4 " Bit RS163HDNS BIAS Unit Hycalog Anadrill 201203 0155

Extension SubControl Unit Stabilizer Float Sub

AnadrillAnadrill Anadrill Anadrill

631-ES-900730155 DOT 27561 VG3759

PowerPulse HF

Anadrill

M325224291

8" Non-Magnetic Drill Collar Anadrill Crossover 5" HWDP

Jar5" HWDP (15 joints)

Anadrill

309

BHA 3 - 12 Section12 1/4 " Bit MX09C A962M5630SP (1.5 deg) 8 1/8" Pony NMDC Float Sub PowerPulse HF Hughes Christensen Anadrill Anadrill Anadrill Anadrill SBM P 009-2 VG3759 M325 224291 X90DA

8" Non-Magnetic Drill Collar Anadrill

Crossover5" HWDP Jar 5" HWDP Anadrill 309

5" 19.50 DPS, 10% Wear (67 joints)5" HWDP (15 joints)

Hydraulics 1Company Name: Maersk Oil Qatar AS Field: AL SHAHEEN Structure: Platform AA Well: AA-22 Location: Borehole: AA-22 Operator: District: BHA Data: BHA4 Wellbore Data: WG Survey Data: Gyro survey Mud Wt: PV: YP: K: n: Fann 3: Fann 6: Fann 100: Fann 200: Fann 300: Fann 600: Model: 9.400 11.0 33.0 2837.1 0.322 0.0 0.0 0.0 0.0 44.0 55.0 Power Law ft ft ft ft Pressure Drop Summary lbm/gal Surf. Eqpt: 63 cP Inside Drillstr. 734 lbf/100ft2 Tools: 293 eq.cP Motor: 656 Bit Nozzles: 630 lbf/100ft2 Annulus: 52 lbf/100ft2 Chokeline: lbf/100ft2 Hyd Imbalance:0 lbf/100ft2 TOTAL: 2427 lbf/100ft2 lbf/100ft2 Bit Optimization Bit Flowrate: 950 Jet Velocity: 273.7 Bit HSI: 2.96 Jet Imp.Force: 1266.0 % Hyd Pow: 25.96 Borehole description ID in 3.25 7.88 2.81 2.81 5.90 2.88 2.88 3.00 2.81 3.00 4.28 3.00 4.28 OD in 8.00 9.63 8.13 8.00 8.13 8.00 6.63 5.00 6.50 5.00 4.93 5.00 4.93 Cum Len ft 1.10 27.88 38.00 41.00 68.55 99.53 102.34 132.48 164.08 194.53 2278.31 2736.26 4267.00 Press Drop psi 630.3 656.4 6.6 2.0 292.5 18.4 1.7 15.0 20.5 15.2 245.6 228.1 180.4 Element Length ft 13 3/8" Casing 2886.00 Open Hole 1381.00 ID in 12.46 12.25 Cum Len ft 2886.00 4267.00 psi psi psi psi psi psi psi psi psi

Flowrate: ECD at Bit: ECD at Shoe: User Depth: ECD at Depth:

950 9.707 9.630 0.0 9.400

gal/min lbm/gal lbm/gal ft lbm/gal

Depth In: Depth Out: Bit TVD: Bit MD:

3239.8 4267.0

gal/min ft/s hp/in2 lbf

BHA Description Element Length ft 12 1/4 " Bit 1.10 A962M5630SP 26.78 8 1/8" Pony NMDC 10.12 Float Sub 3.00 PowerPulse HF 27.55 8" Non-Mag D C 30.98 Crossover 2.81 5" HWDP 30.14 Jar 31.60 5" HWDP 30.45 5" 19.50 DPS 2083.78 5" HWDP 457.95 5" 19.50 DPG 1530.74

Hydraulics 2Bit Details Type: Insert Bit Diameter: 12.250 TFA: 1.114 Nozzles (1/32in) in in2 3x22 Reamer Type: Diameter: TFA: 0.000 in Surface Equipment : 4 Length ft Standpipe: 45 Rotary Hose: 55 Swivel: 6 Kelly: 40 Effective: 340 Maximum WOB: Maximum Overpull: On-Bottom Pressure Drop: Off-Bottom Pressure Drop: Stall Nozzle Flowrate: Stall Motor Flowrate: Stall WOB: Stall DTOR: Stall Pressure Drop: ID in 4.00 3.00 3.00 4.00 3.83 75.9 21.5 656.4 595.2 0.0 950.0 297.2 18201.8 1322.6 1000 lbf 1000 lbf psi psi gal/min gal/min 1000 lbf ft.lbf psi

Motor Details Motor: A962M5630SP % % in/32 gal/min gal/min gal/min gal/min gal/min Hydraulic Thrust: Bearing Capacity: On-Bottom RPM: WOB: 25.0 DTOR: 1531.1 Delta P: 61.2 Mechanical HP: 30.8 Optimum HP: 156.4 Efficiency: 19.7 Hole Cleaning in g/cm3 ft/h % by Vol lbm/gal 27.2 1000 lbf 48.7 1000 lbf 105.6 rpm 1000 lbf ft.lbf psi hhp hhp %

Bearing Flow: 0 Wear: 0.0 Rotor Nozzle: 0 Min Flowrate: 600.0 Max Flowrate: 1200.0 Bearing Flowrate: 0.0 Nozzle Flowrate: 0.0 Motor Flowrate: 950.0 Cuttings Cuttings Diameter: Cuttings Density: ROP: Cutt. Concentration: Bit ECD Increase:

0.30 2.10 70.0

Flow above critical rate RPM: Critical Rate: Annular Flow: Critical MD: Hole Inclination:

40 937.2 950.0 4239 86

gal/min gal/min ft deg

Recommendations To drill DV and Shoe track with tricone bit before Picking up Power drive and PDC pit to drill formation. More hydraulic horse power is needed to drill Naher Umr shale to avoid bit getting bold

8 SectionObjectives: To geosteer the well as per well site geologist instruction. Results:

The Power Drive was used to geosteer the Drain to the coring point at 15133 feet with average of 167 feet per hour on bottom ROP.Two 30 feet core were cut with 71% and 62 % recovery . Power Drive was used to steer the well to TD after coring.

BHA 4 8 Section8 1/2 " Bit MX-C1 BIAS Unit Extension Sub Control Unit RAB-6 PowerPulse HF ADN-6 8" Non-Magnetic Drill Collar Stabilizer Hughes Christensen Anadrill Anadrill Anadrill Anadrill Anadrill Anadrill Anadrill Anadrill P88JL 60142 60175 60072 129 Y915 314 353 DOT 29282

BHA 5 8 Section8 1/2 " Bit MXB-CX00 BIAS Unit Extension Sub Control Unit RAB-6 PowerPulse HF ADN-6 Hughes Christensen Anadrill Anadrill Anadrill Anadrill Anadrill Anadrill W19dg 60142 60175 60072 129 Y915 314 353

8" Non-Magnetic Drill Collar Anadrill

Hydraulics 1Company Name: Maersk Oil Qatar AS Field: AL SHAHEEN Structure: Platform AA Well: AA-22 Location: Borehole: AA-22 Operator: District: BHA Data: BHA6 Wellbore Data: WG Survey Data: Gyro survey Mud Wt: PV: YP: K: n: Fann 3: Fann 6: Fann 100: Fann 200: Fann 300: Fann 600: Model: 10.000 19.0 41.0 2424.8 0.397 0.0 0.0 0.0 0.0 60.0 79.0 Power Law ft ft ft ft lbm/gal cP lbf/100ft2 eq.cP

lbf/100ft2 lbf/100ft2 lbf/100ft2 lbf/100ft2 lbf/100ft2 lbf/100ft2

Pressure Drop Summary Surf. Eqpt: 36 Inside Drillstr. 1306 Tools: 234 Motor: 0 Bit Nozzles: 609 Annulus: 835 Chokeline: Hyd Imbalance: TOTAL: 3019

psi psi psi psi psi psi psi 0 psi

psi

Flowrate: ECD at Bit: ECD at Shoe: User Depth: ECD at Depth:

530 14.876 11.007 0.0 10.000

gal/min lbm/gal lbm/gal ft lbm/gal

Depth In: Depth Out: Bit TVD: Bit MD:

3292.2 19283.0

Bit Optimization Bit Flowrate: 530 Jet Velocity: 260.8 Bit HSI: 3.32 Jet Imp.Force: 716.1 % Hyd Pow: 20.16 Borehole description Length ID ft in 9 5/8" Casing 4267.00 8.68 Open Hole 15016.00 8.50 Element

gal/min ft/s hp/in2 lbf

BHA Description Element

Length ft 8 1/2 " Bit 0.80 BIAS Unit 2.35 Extension Sub 1.01 Control Unit 9.69 RAB-6 12.17 PowerPulse HF 27.37 ADN-6 20.50 8" Non-Mag D C 30.19 5" 19.50 DPS 189.36 5" PUP 10.00 5" 19.50 DPG 18979.56

ID in 2.25 2.63 2.63 2.81 5.00 5.00 5.00 2.88 4.28 4.28 4.28

OD in 5.75 6.75 6.75 6.81 6.75 6.75 6.75 6.50 4.93 4.93 4.93

Cum Len ft 0.80 3.15 4.16 13.85 26.02 53.39 73.89 104.08 293.44 303.44 19283.00

Press Drop psi 609.4 1.2 0.5 3.6 20.7 185.5 27.9 10.2 12.7 0.7 1276.3

Cum Len ft 4267.00 19283.00

Hydraulics 2Bit Details Type: Insert Bit Diameter: 8.500 TFA: 0.652 Nozzles (1/32in) Reamer Type: in Diameter: in2 TFA: 1x12, 2x15, 1x16 0.000 in Surface Equipment : 4 Length ft Standpipe: 45 Rotary Hose: 55 Swivel: 6 Kelly: 40 Effective: 340 Maximum WOB: Maximum Overpull: On-Bottom Pressure Drop: Off-Bottom Pressure Drop: Stall Nozzle Flowrate: Stall Motor Flowrate: Stall WOB: Stall DTOR: Stall Pressure Drop: ID in 4.00 3.00 3.00 4.00 3.83 1000 lbf 1000 lbf psi psi gal/min gal/min 1000 lbf ft.lbf psi

Motor Details Motor: Bearing Flow: Wear: Rotor Nozzle: Min Flowrate: Max Flowrate: Bearing Flowrate: Nozzle Flowrate: Motor Flowrate: Cuttings Cuttings Diameter: Cuttings Density: ROP: Cutt. Concentration: Bit ECD Increase: % % in/32 gal/min gal/min Hydraulic Thrust: Bearing Capacity: On-Bottom RPM: WOB: DTOR: Delta P: gal/min gal/min gal/min Hole Cleaning in g/cm3 ft/h % by Vol lbm/gal 1000 lbf 1000 lbf rpm 1000 lbf ft.lbf psi hhp hhp %

Mechanical HP: Optimum HP: Efficiency: Flow below critical rate RPM: Critical Rate: Annular Flow: Critical MD: Hole Inclination:

0.05 2.60 120.0

180 550.5 530.0 4267 87

gal/min gal/min ft deg

Recommendations 38 hrs circulation with heavy mud after taking a kick while reaming out of hole were encountered. One of the seals failed. During drilling and before POOH the tool was behaving as expected. Only visual inspection on rig floor when out of hole detected the failure. Avoid long circulations with heavy mud.

Carefully visual inspection to be performed of the tool after run.

END