IPS-14-22
Wireline Perforating Technology Maximizes
Well Productivity and Minimizes Operational Risks
Risal Rahman, Andika Yudhatama, Total E&P Indonesie
Carlos Baumann, Denny Gultom, Harvey Williams, Schlumberger
Slide 2
Field Overview
•
Tunu and Tambora, major gas fields in the
Mahakam Delta
•
Cumulative production exceeds 1 Bscfpd
and 10,000 bepd
•
Most reservoirs are between 7,500 ft
(2,285 m) and 15,000 ft (4,580 m) TVD.
•
Hundreds of wells drilled since the 1990’s
•
Multizone wells (up to 20 zones per well)
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Wireline Perforating Technology Maximizes Well Productivity
Slide 3
TUNU FIELD CHARACTERISTICS
Res name
vol
MW
1.1SGU2.1
WNW
0
V /V
0
GA P I
RT
1
0.2
OHMM
0.96
2700
PPM
40
1.7
RHOB
G/C3
10
0.6
NPHI
V/V
Very
Shallow
Original
water
0.97
2a
2750
MFA
1000
0.80
2800
MFB
Beta
2000
MF6
MF1.5
MF2
Fresh
Water
Sand
2b
2b-1
2c
Tunu
Shallow
MF0
MF1
0.79
2850
2c-1
0.88
2d
2d-1
2900
0.91
0.85
0.90
2950
0.85
0.95
2e
2f
2g
Intra-beta
3000
2h
0.99
3000
3a
SU1
3050
3b
SU2
SU3
4000
High Pressure
Belly
>=1.20sg
SU4
3100
0.72
0.72
0.99
3b-1
3c
O110
3150
3d
3200
0.73
3e
0.87
SU5
4a
Fluviatil channel
Distributary channel
Mouth bar
Gas
Geological Setting & Reservoir Characteristics
SU6
4b-1
4c
3350
0.86
4d
0.57
0.57
0.65
3400
4e
4f
0.71
4g
4g-1
3450
Water
rise
0.74
0.45
4h
4h-1
3500
4i
0.47
0.48
~2m thickness
4j
3550
4k
Highly heterogeneous on the lateral and vertical connectivity
4k-1
5a
3600
5a-1
Risk of water rise
0.52
3650
1.08
0.34
3750
3800
5a-2
5b
5b-1
5b-2
1.05
0.59
0.62
0.57
0.57
5e
5f
5g
5g-1
3850
Q105
5c
5c-1
5c-2
5d
3700
1.55
3
1.45
Highly heterogeneous on pressure regime & fluid properties
Gas
(various
pressures
0.2-1.5)
4b
3300
10,000s Multi-layered deltaic reservoirs (~30 reservoirs per well)
Depleted reservoirs
LAUQI_1
0 V/V 4
2a-1
5000
TUNU field is maturing
0
1h-1
3250
20km
2.7
1h-2
MFA
Tunu
Main
Zone
5km of reservoir section
US /F
1h
2650
70km
240
0
TG
150
ESE
0
Tunu Main
Zone only
dt
20
GR
TD_DRILLER
Q122
Slide 4
PERFORATION TECHNIQUE – DYNAMIC UNDERBALANCE (DUB)
Operational Limitations:
-
Conditions to use DUB cleanup:
-
Liquid in the wellbore
-
Reservoir:
-
Porosity > 12%
-
Permeability: >1 mD for gas, > 10 mD for oil
-
Pore pressure > 2000 psi
-
Not in unconsolidated formations / sanding risk
Advantage :
- The DUB cleans perforation damage / plugged tunnels
4
Slide 5
INTERVENTION TECHNIQUE TO PERFORATE NEW WELLS
MAIN INTERVENTION SEQUENCE
PERFORATED LENGTH (METERS)
4000
Tubing clear all the way to the bottom of the
well
Cement bond log from bottom to top of cement
3500
North
3000
2500
Nitrogen kick-off to unload completion brine
Maximum unload to create low wellbore pressure
2000
Perforate with DUB
1500
Well clean up
1000
Remove remaining
perforation debris
completion
brine
South
and
500
0
2005
2006
2007
2008
2009
2010
2011
2012
2013
The DUB perforating technique along with the nitrogen kick-off technique has been used in many wells in
the TUNU gas field; nine (9) of these wells are included in this paper.
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Wireline Perforating Technology Maximizes Well Productivity
Slide 6
Gas Wells - Actual / post-job vs. expected / pre-job relative productivity
Wells 1-7 standard DUB perforating jobs
Wells 8-9 post-perforating DUB clean-up jobs
Pre-job estimated productivity calculated based on an integrated toolbox considering several parameters,
such as porosity, mobility, reservoir pressure and other reservoir characteristic.
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Wireline Perforating Technology Maximizes Well Productivity
Slide 7
Typical Wireline Jobs for Gas wells: Max safe SUB << Max DUB
7
Wireline Perforating Technology Maximizes Well Productivity
Slide 8
DUB cleanup > SUB cleanup > DOB cleanup
8
Wireline Perforating Technology Maximizes Well Productivity
Slide 9
The importance of perforating damage cleanup
9
Wireline Perforating Technology Maximizes Well Productivity
Slide 10
Case 1: Standard DUB perforating job
After perforating this well produced > 500% of the expected productivity
20-ft long 2.5-in DUB gun with deep-penetrating 12-gram HMX charges
10
Wireline Perforating Technology Maximizes Well Productivity
Slide 11
20-ft long 2.5-in DUB gun with deep-penetrating 12-gram HMX charges
11
Wireline Perforating Technology Maximizes Well Productivity
20-ft long 2.5-in DUB gun with deep-penetrating 12-gram HMX charges
Slide 12
Wellbore Dynamics – Very Low Weak-Point Load – Animation
12
Wireline Perforating Technology Maximizes Well Productivity
Slide 13
20-ft long 2.5-in DUB gun with deep-penetrating 12-gram HMX charges
Wellbore Dynamics – Gunshock Loads – Up to 0.04 sec
13
Wireline Perforating Technology Maximizes Well Productivity
Slide 14
20-ft long 2.5-in DUB gun with deep-penetrating 12-gram HMX charges
Wellbore Dynamics – Gunshock Loads – Up to 0.30 sec
14
Wireline Perforating Technology Maximizes Well Productivity
Slide 15
20-ft long 2.5-in DUB gun with deep-penetrating 12-gram HMX charges
Wellbore Dynamics – Gunshock Loads – Up to 0.25 sec
15
Wireline Perforating Technology Maximizes Well Productivity
Slide 16
Pressure at the fast gauge – Measured vs. Simulated
16
Wireline Perforating Technology Maximizes Well Productivity
Slide 17
Comparison between the Concrete-based and the Rock-based model
17
Wireline Perforating Technology Maximizes Well Productivity
Slide 18
Comparison between the Concrete-based and the Rock-based model
18
Wireline Perforating Technology Maximizes Well Productivity
Slide 19
Case 2: Post-perforating DUB cleanup job
20-ft long 2.88-in DUB gun loaded with DUB charges at 0.5 spf
After DUB cleanup this well produced > 1,200% of the expected productivity
19
Wireline Perforating Technology Maximizes Well Productivity
20-ft long 2.88-in DUB gun loaded with DUB charges at 0.5 spf
Slide 20
Wellbore Dynamics – Bottom Gauge Pressure - Animation
20
Wireline Perforating Technology Maximizes Well Productivity
Slide 21
20-ft long 2.88-in DUB gun loaded with DUB charges at 0.5 spf
Wellbore Dynamics – Up to 0.04 sec
21
Wireline Perforating Technology Maximizes Well Productivity
Slide 22
20-ft long 2.88-in DUB gun loaded with DUB charges at 0.5 spf
DUB amplitude around the gun is larger than at the bottom gauge
22
Wireline Perforating Technology Maximizes Well Productivity
Slide 23
Pressure at the fast gauge – Measured vs. Simulated
23
Wireline Perforating Technology Maximizes Well Productivity
Slide 24
Conclusions
• DUB Perforating helped deliver highly productive wells in the Tunu field
• DUB enabled perforating long intervals with HSD and deep penetrating
charges, without risk of gun jumping
24
Wireline Perforating Technology Maximizes Well Productivity
Slide 25
Conclusions – Cont.
• Total E&P Indonesie uses Dynamic Underbalance (DUB) perforating with
a nitrogen kick-off technique to create perforation tunnels with much
lower skin values / higher productivity
• This approach also promotes natural well flow after perforating, without
the extra cost of coiled tubing intervention to perform liquid unloading
Thank You !
Questions ?
25
Wireline Perforating Technology Maximizes Well Productivity
BACK UP SLIDES
Wireline Perforating Technology Maximizes Well Productivity • Risal Rahman
Wireline Perforating Technology Maximizes Well Productivity • Risal Rahman
Wireline Perforating Technology Maximizes Well Productivity • Risal Rahman
Wireline Perforating Technology Maximizes Well Productivity • Risal Rahman