1. DRILLING

2. 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

3. 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

4. Well profiles Well Name Target Layer Well TVD (m-MDDF) Profile
Name
Target
Layer
Well TVD
(m-MDDF)
Profile
Completion Type
Remarks
BE-1
M 2/3
1280.0
Vertical
Single
Producer
BE-2
1270.0
BE-3
Dual
M 7/8
1305.0
BE-4
1295.0
BE-5
1321.0
BE-6
1307.0
M 9/14
1342.0
BE-7
1318.0
BE-8
1330.0
BE-9
1350.0
BE-10
1320.0
BE-11
M 15
1338.0
BE-12
1400.0
Injector
BE-13
1390.0
1410.0
BE-14
BE-15
1380.0
BE-16
BE-17
1370.0
1395.0
BE-18
1430.0
BE-19
BE-20

5. Casing Design & Bit Selection
Casing Setting Depth (m-TVD)
Casing OD
(in)
Casing grade
Bit size
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”
Production
1328 7”
V-150/ Extreme-line
8-1/2”

6. Assume Pressure Gradient (psi/ft) Proposed Mud Weight (ppg)
Drilling Fluid System
Hole Size (in)
Casing Size (in)
Casing Type
Mud Type
Assume Pressure Gradient (psi/ft)
Proposed Mud Weight (ppg) 26 20
Conducto r
Sea water + Hi Vis Sweeps
0.433
17-1/2
13-3/8
Surface
Seawater Polymer
12-1/4
9-5/8
Intermedi ate
KCL / PHPA
0.478
8-1/2 7
Productio n

7. Producing Well (BE-1 – BE-11) Injector Wells (BE-12 – BE-20)
Casing Cementation
Well
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: Surface
Tail: 150m above 13-3/8 shoe
12.6
9-5/8”
Lead: 150m above 13-3/8” shoe
Tail: 150m above 9-5/8” shoe 7”
Top of Liner

8. Type of Cement / Additive
Casing Cementation
Casing OD
(in)
Casing ID
Type of Cement / Additive
Lead Slurry Volume
Tail Slurry volume
Total
26”
25.65”
Class “G”
493 sacks
Seawater
54.46 bbl
Mixing Fluid
63.25 gal
Fluid Loss
24.64 gal
13 3/8”
12.459”
556 sacks
462 sacks
1018 sacks
146.7 bbl
51.04 bbl
bbl
bbl
59.29 bbl
bbl
27.8 gal
23.1 gal
50.9 gal
Retarder
33.36 gal
9.24 gal
42.6 gal
Dispersant
556 gal
161.7 gal
717.7 gal
9 5/8”
8.535”
397 sacks
210 sacks
607 sacks
bbl
23.22 bbl
bbl
bbl
26.98 bbl
bbl
19.83 gal
10.51 gal
30.34 gal
23.8 gal
4.2 gal
28 gal
gal
73.57 gal
470.19 7”
6.366”
542 sacks
59.67 bbl
69.62 bbl
27.12 gal
10.85 gal
gal

9. Potential Drilling Hazards
Shallow Gas
Lost Circulation Zone
CO₂ and H₂S Content
Occupational Safety
Hole Cleaning
Stuck pipe/differential sticking

10. Time and Cost Estimation

11. Drilling Optimization
Monobore Completion
Multilateral Completion
Rotary Steerable System (RSS)