DRILLING

Rig Selection

• Things To consider– Water Depth : 76 m (appx : 250 ft)– 3 types of major drilling rig are feasible• Tender Assisted (44 MMUSD/day)• Jack up rig (50 MMUSD/day)• Semi Submersible (297 MMUSD/day)

– Tender Assisted Rig• Water depth• Seabed soil condition• Costing rig, capacity and stability

Well Trajectories

• Factors– Target of the wells– The drainage radius– Well azimuth and inclination

• May be revised accordingly to actual well results, geological and res. modelling.

• All wells are proposed to be vertically drilled.• Total number of producing wells = 11 wells• Total number of injecting wells = 9 wells

Well profilesWell

NameTargetLayer

Well TVD (m-MDDF)

Well Profile

Completion Type

Remarks

BE-1 M 2/3 1280.0 Vertical Single ProducerBE-2 M 2/3 1270.0 Vertical Single Producer

BE-3 M 2/3 1280.0 Vertical Dual ProducerM 7/8 1305.0 VerticalBE-4 M 7/8 1295.0 Vertical Single ProducerBE-5 M 7/8 1321.0 Vertical Single Producer

BE-6 M 7/8 1307.0 Vertical Dual ProducerM 9/14 1342.0 VerticalBE-7 M 7/8 1318.0 Vertical Single ProducerBE-8 M 9/14 1330.0 Vertical Single ProducerBE-9 M 9/14 1350.0 Vertical Single Producer

BE-10 M 9/14 1320.0 Vertical Single ProducerBE-11 M 15 1338.0 Vertical Single ProducerBE-12 M 2/3 1400.0 Vertical Single Injector

BE-13 M 2/3 1390.0 Vertical Dual InjectorM 9/14 1410.0 Vertical

BE-14 M 2/3 1400.0 Vertical Dual InjectorM 9/14 1350.0 VerticalBE-15 M 7/8 1380.0 Vertical Dual Injector

M 9/14 1400.0 Vertical BE-16 M 7/8 1380.0 Vertical Dual InjectorM 9/14 1410.0 VerticalBE-17 M 7/8 1370.0 Vertical Dual InjectorM 9/14 1395.0 VerticalBE-18 M 7/8 1380.0 Vertical Dual InjectorM 15 1430.0 VerticalBE-19 M 7/8 1400.0 Vertical Single InjectorBE-20 M 15 1380.0 Vertical Single Injector

Casing Design & Bit SelectionCasing Casing Setting

Depth (m-TVD)Casing

OD (in)

Casing grade Bit size(in)

Type of bit

Conductor 80 26” X-56/ Threaded - -

Surface 500 13-3/8” L-80/BTC 17-1/2” PDC

Intermediate 950 9-5/8” P-110/LTC 12-1/4” PDC

Production 1328 7” V-150/ Extreme-line 8-1/2” PDC

Drilling Fluid SystemHole Size (in)

Casing Size (in)

Casing Type

Mud Type Assume Pressure Gradient (psi/ft)

Proposed Mud

Weight (ppg)

26 20 Conductor

Sea water + Hi Vis

Sweeps

0.433 9.1 - 9.2

17-1/2 13-3/8 Surface Seawater Polymer

0.433 9.2 - 9.4

12-1/4 9-5/8 Intermediate

KCL / PHPA 0.478 10.1 - 10.3

8-1/2 7 Production

KCL / PHPA 0.478 10.0 - 11

Casing CementationWell Casing Top of Cement Lead (ppg) Tail (ppg)

Producing Well (BE-1 –

BE-11)

Injector Wells (BE-12 – BE-

20)

20” Surface 15.8

13-3/8” Lead: SurfaceTail: 150m above 13-3/8 shoe

12.6 15.8

9-5/8” Lead: 150m above 13-3/8” shoeTail: 150m above 9-5/8” shoe

12.6 15.8

7” Top of Liner 15.8

Casing CementationCasing OD

(in)Casing ID

(in)Type of Cement

/ AdditiveLead Slurry

VolumeTail Slurry

volume Total

26”

25.65”

Class “G” 493 sacks 493 sacksSeawater 54.46 bbl 54.46 bblMixing Fluid 63.25 gal 63.25 galFluid Loss 24.64 gal 24.64 gal

13 3/8”

12.459”

Class “G” 556 sacks 462 sacks 1018 sacksSeawater 146.7 bbl 51.04 bbl 197.74 bblMixing Fluid 165.48 bbl 59.29 bbl 224.77 bblFluid Loss 27.8 gal 23.1 gal 50.9 galRetarder 33.36 gal 9.24 gal 42.6 galDispersant 556 gal 161.7 gal 717.7 gal

9 5/8”

8.535”

Class “G” 397 sacks 210 sacks 607 sacksSeawater 107.56 bbl 23.22 bbl 130.78 bblMixing Fluid 118.04 bbl 26.98 bbl 145.02 bblFluid Loss 19.83 gal 10.51 gal 30.34 galRetarder 23.8 gal 4.2 gal 28 galDispersant 396.62 gal 73.57 gal 470.19

7”

6.366”

Class “G” 542 sacks 542 sacksSeawater 59.67 bbl 59.67 bblMixing Fluid 69.62 bbl 69.62 bblFluid Loss 27.12 gal 27.12 galRetarder 10.85 gal 10.85 galDispersant 189.87 gal 189.87 gal

Potential Drilling Hazards

Shallow GasLost Circulation ZoneCO₂ and H₂S ContentOccupational SafetyHole CleaningStuck pipe/differential sticking

Time and Cost Estimation

Drilling Optimization

Monobore CompletionMultilateral CompletionRotary Steerable System (RSS)