Embed Size (px)
Citation preview
Deepwater Drilling Operation
Analysis
Presented by
Team # 12
PTE-514
Outline
• Objectives
• Geological Overview
• Casing Design
• Drill Bit Design
• Drilling Programs
• Drilling Operation
• Analysis & Findings
• Conclusion
Objectives
Late Cretaceous Kaba Channel
Early Cretaceous Albian Sands
Geological Overview
Fifa #1
2275~2800m
Claystone
2800~3275m
Claystone/Sandstone
3275~3750m
Claystone
3750~4323m
Claystone/Shale/Sandstone
4323~4775m
Sandstone/Claystone
Hihon #1
2180~3280m
Sandy Claystone
3280~4025m
Sand/Claystone
Total Gas in Fifa #1
Depth:2931~2989m
Depth:3018~3029m
Depth:3748~3763m
Depth:4338~4556m
Fifa#1 Lithology
Hihon#1 Lithology
Petrographic analysis (Core Lab Analysis) indicates several formation damage:
HF acid sensitivity – Carbonate minerals
Major Damage Potential at Depth
4329 m, 4403.0 m, 4536.5 m, 4749.0 m
HCl Acid Sensitivity – Iron Bearing Minerals
Major Damage Potential at Depth:
4329m, 4344.0 m, 4536.5 m, 4749.0 m
Minor to Moderate Damage Potential at Depth: 4428.0m, 4587.5m
Fines Migration – Authigenic Kaolinite
Major Damage Potential at Depth:
4344.0 m, 4403.0 m, 4428.0 m
Minor to Moderate Damage Potential at Depth: 4391.5m, 4587.5m
HF Acid Sensitivity – Feldspar
Moderate Damage Potential
Fifa#1 Formation Damage
Hihon#1 Formation Damage
Petrographic analysis (Core Lab Analysis) indicates several formation damage:
HF acid sensitivity – Carbonate minerals
Major Damage Potential at Depth:
3437.5 m, 3442.0 m, 3451.5 m, 3533.5 m, 3559.0 m, 3574.0 m,3589.0 m, 3602.0 m, 3716.5 m,
3746.5 m, 3788.0 m, 3931.0 m, 4007.0 m
HCl Acid Sensitivity – Iron Bearing Minerals
Major Damage Potential at Depth:
3451.5m, 3589.0 m, 3740.0 m, 3788.0 m
Fines Migration – Authigenic Kaolinite
Major Damage Potential at Depth:
3404.5 m, 3417.5 m, 3442.5 m, 3447.5 m, 3451.5 m, 3476.0 m,
3907.0 m, 3931.0 m, 3971.0 m
HF Acid Sensitivity – Feldspar
Moderate Damage Potential
Casing Design (FIFA)
S.No Boundary
Name
True Vertical
Depth, TVD (m)
Pore Equivalent
Mud Weight (ppg)
Pore Equivalent Mud
Weight with safety
(ppg)
Frac Equivalent
Mud Weight (ppg)
Frac Equivalent Mud
Weight with safety
(ppg)
1 Seabed 2150 8.50 8.67 8.50 8.33
2 Miocene 2500 9.00 9.18 9.80 9.60
3 Oligocene Unc. 2680 9.80 10.00 10.50 10.29
4 Top Paleocene 2900 10.00 10.20 11.00 10.78
5 Base Tertiary 3050 9.80 10.00 11.50 11.27
6 Senonian Unc. 3250 10.00 10.20 12.00 11.76
7 Top Kaba 3700 11.00 11.22 13.00 12.74
8 Cenomanian
Carb 4050 11.20 11.42 13.50 13.23
9 Top Albian 4200 11.20 11.42 13.70 13.43
10 Early Cretacious 4757 10.50 10.71 14.50 14.21
Casing Design (FIFA): Post-Drilling Analysis Data
The Post Drilling data was
analyzed to determine the
pore and frac pressures and
required casing depth.
Casing Design (FIFA) : TVD vs Equivalent Mud Weights (EMW)
2000
2500
3000
3500
4000
4500
5000
8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00
TV
D (
m)
Equivalent Mud Density (ppg)
Pore Equivalent Mud Weight (ppg) Pore Equivalent Mud Weight with safety (ppg)
Frac Equivalent Mud Weight (ppg) Frac Equivalent Mud Weight with safety (ppg)
Casing Design (FIFA) : Casing & Tubing Specifications
S.No Size (in) 36 36 13 3/8 9 5/8 7
1 Weight (ppf) 374.0 (1" wt) 553.0 (1.5" wt) 72.0 53.5 29.0
2 Grade X52 X52 L80 L80 L80
3 Connection Vetco RL-4B Vetco RL-4B BTC BTC BTC
4 Max OD (in) 36.00 36.50 14.38 10.63 7.66
5 Max ID (in) 31.295 at connector 12.25 sp drift 8.50 sp drift 6.125 sp drift
6 Makeup (ft-lbs) 1/4 turn - 30 to 40,000 Triangle Triangle Triangle
7 Burst (psi) 2530 3790 5380 7930 8160
8 Collapse (psi) 1050 2600 2670 6620 7020
9 Tension (kips) 5718 8454 1661 1244 676
Proposed Casing Design (FIFA) • 36” casing jetted to a depth of 2265 m.
• 20 x 13 3/8” casing in a hole size of 17 1/2” to a depth of 3014 m.
• 9 5/8” casing in a hole size of 12 ¼” to a depth of 3481 m.
• 7” liner in a hole size of 8 ½”. This is used if the previous casing setting does not reach
the required total depth.
Casing Design (HIHON)
S.No Boundary Name True Vertical
Depth, TVD (m)
Pore Equivalent
Mud Weight (ppg)
Pore Equivalent Mud
Weight with safety
(ppg)
Frac Equivalent
Mud Weight (ppg)
Frac Equivalent Mud
Weight with safety
(ppg)
1 Seabed 2200 8.50 8.67 8.6 8.43
2 Top Miocene 2600 8.40 8.57 9.8 9.60
3 Mid Miocene 2825 8.20 8.36 10 9.80
4 Base Tertiary 3000 8.50 8.67 10.5 10.29
5 Cenomanian 3125 9.00 9.18 11 10.78
6 Albian Unc 3250 9.00 9.18 11.3 11.07
7 Mid Albian Sd 3350 9.10 9.28 11.5 11.27
8 Mid Cret Unc 3550 9.80 10.00 11.8 11.56
9 Neocomian 4000 8.50 8.67 12.7 12.45
Casing Design (HIHON): Post-Drilling Analysis Data
The Post Drilling data was
analyzed to determine the
pore and fracture pressures
and the required casing
depth.
Casing Design (HIHON) : TVD vs Equivalent Mud Weights (EMW)
2000
2500
3000
3500
4000
8.00 8.50 9.00 9.50 10.00 10.50 11.00 11.50 12.00 12.50 13.00
TV
D (
m)
Equivalent Mud Density (ppg)
Pore Equivalent Mud Weight (ppg) Pore Equivalent Mud Weight with safety (ppg)
Frac Equivalent Mud Weight (ppg) Frac Equivalent Mud Weight with safety (ppg)
Casing Design (HIHON) : Casing Specifications
S.No Hole sections 36” 26” 17 ½” 12 ¼”
1 Open Hole MD N/A 2822 m 3195 m 4025 m
2 TVD N/A 2822 m 3195 m 4024.4 m
Casing Size
36” 26” 17 ½” 12 ¼”
1 Casing Shoe 2285 m 2808 m 3183.7 m N/A
2 TVD 2285 m 2808 m
3187.7 m N/A
Proposed Casing Design (HIHON) • 36” casing jetted to a depth of 2282 m.
• 20” casing in a 26” hole to a depth of 2808 m.
• 13 3/8” casing to a depth of 3159 m.
Drill Bit Details (FIFA)
Indicated Hole
Problems
Total loss of
tooth
The given table was used for drill bit analysis
Drill Bit Details (HIHON)
Bit hole was changed
Total loss of tooth
Drilling Mud Details (FIFA)
Interval (m) Casing Size
(in)
Mud Weight
(ppg) Mud Type
2150 – 2239 36 8.7 Seawater
2239 – 2839 13 3/8 8.7 Seawater
2839 – 3518 9 5/8 9.2 OBM-EDC 99
DW
3518 – 4757 7 9.2
OBM-EDC 99
DW
Drilling Mud Details (HIHON)
Interval (m) Casing Size
(in)
Mud Weight
(ppg) Mud Type
2212 – 2284 36 8.6 Seawater
2284 – 2812 26 8.6 – 8.9 Seawater
2812 – 3272 17 ½ 9.3 – 9.5 OBM-EDC 99
DW
3272 – 4025 12 ¼ 10 – 11.5
OBM-EDC 99
DW
Drilling Programs
FIFA-1 HIHON-1 Mud
Water Depth: 2156 m SS 2187 m SS
Conductor: 36” @ 2265 m SS 36” @ 2259 m SS Sea Water
1st Hole: 17-1/2” to 3014 m SS 26” to 2787 m SS Sea Water
1st Casing: 20” X 13-3/8” @ 2981m SS 20” @ 2787 m SS
2nd Hole: 12-1/4” to 5025M (or 95/8” shoe) 17-1/2” to 3272 m SS OBM
2nd Casing: 9-5/8” @ 3500 m SS (optional) 13-3/8” @ 3247 m SS
3rd Hole: 8-1/2” to 5025 m SS (TD) 12-1/4” to 4025 m SS TD OBM
3rd Casing: 7” liner (optional) 9-5/8” @ 4025 m SS (optional)
Program Days: 30 days (95.6m/day) 30 days (61.2 m/day)
Although FIFA-1 well is deeper, it was planned to be drilled in shorter time because of the
smaller holes to be drilled and less number of casing originally anticipated.
Drilling Programs
Contractor: Transocean
Drill Ship: Deepwater Discover
Description: Dynamic positioned drillship
Water depth: 10,000 ft (3,048 m) max.
Drilling Depth: 30,000 ft (9,144 m) max.
Riser: 21¼ in OD x .812 in wall thick.
BOP: Cameron 18 ¾ in., 15,000 psi
Derrick load: 2,000,000 lb static
Top drive: Varco TDS-4S DC, 50,900 ft-lbs
Mud Capacity: 15,000 bbls
Drilling Operation
Fifa-1 Well Drilling Troubles by Hole Section:
Hole section Trouble (cause)
• 36” Conductor: No problems
• 17-1/2” Hole: Hole packed off while drilling (hole cleaning/hole instability)
• 12-1/4” Hole: Well kicked in (insufficient mud weight)
Hole packed off (hole cleaning/hole instability)
• 8-1/2” Hole: Well kicked in (insufficient mud weight)
Loss of circulation (high permeability zone)
Stuck pipe (hole cleaning)
• 6” Hole: Connection gas (insufficient mud weight)
Drilling, logging & abandonment operation completed in 54 days vs. 30 days planned
Drilling Operation
Hihon-1 Well Drilling Troubles by Hole Section:
Hole section Problems (cause)
• 36” Conductor: No problems
• 26” Hole: Some tight spots (hole cleaning/hole instability)
• 17-1/2” Hole: Well kicked in (insufficient mud weight)
Hole packed off (hole cleaning/hole instability)
Loss of circulation (high permeability zone)
• 12-1/4” Hole: Slow ROP/ several bit trips (improper bit/hard formation)
Drilling, logging & abandonment operation completed in 42 days vs. 30 days planned
Analysis & Findings
Fifa #1
Pay zone 1
Depth:2900~2906m
Net pay:5m
Analysis & Findings
Fifa #1
Pay zone 2
Depth:3752~3756m
Net pay:2m
Phie:17.6%
Swe=45%
K=51md
Analysis & Findings
Fifa #1
Pay zone 3
Depth:4323~4347m
Net Pay:8.2m
Phie:14.1%
Swe=36.7%
K=21md
Analysis & Findings
Hihon #1
Pay zone
Depth:3394~3452m
Team Members
• Nithin Thomas John (Team Leader)
• Ran Liu
• Ahmed AlRamadhan
