IPS-14-22 Wireline Perforating Technology Maximizes … Productivity and Minimizes Operational Risks...

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

Field Overview

• Tunu and Tambora, major gas fields in theMahakam Delta

• Cumulative production exceeds 1 Bscfpdand 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)

Wireline Perforating Technology Maximizes Well Productivity2

Slide 2

1.4

51

.5

5

MW

SGU1.1 2.1

2650

2750

2850

2950

3050

3150

3250

3350

3450

3550

3650

3750

3850

2700

2800

2900

3000

3100

3200

3300

3400

3500

3600

3700

3800

GRGAPI0 150

volV/V0 1

RTOHMM0.2 20

TGPPM0 10

dtUS/F240 40

0.96

0.97

0.80

0.79

0.88

0.910.85

0.90

0.85

0.95

0.99

0.720.72

0.99

0.73

0.87

0.86

0.570.570.65

0.71

0.740.74

0.45

0.470.48

0.52

1.08

0.34

1.051.05

0.590.590.620.570.570.57

1h

1h-1

1h-2

2a

2a-1

2b

2b-1

2c

2c-1

2d

2d-1

2e

2f

2g

2h

3a

3b

3b-1

3c

3d

3e

4a

4b

4b-1

4c

4d

4e

4f

4g

4g-1

4h

4h-1

4i

4j

4k

4k-1

5a

5a-1

5a-25b

5b-1

5b-2

5c

5c-15c-2

5d

5e

5f

5g

5g-1

TD_DRILLER

O110O110

Q105Q105Q105

Q122

Res name

NPHIV/V0.6 0

RHOB

G/C31.7 2.7LAUQI_1

V/V0 4

Originalwater

Gas(various

pressures0.2-1.5)

Waterrise

0

1000

2000

3000

4000

5000

High PressureBelly

>=1.20sg

Fluviatil channelDistributary channelMouth bar

Gas

MF6

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SU5

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MFA

MFB

MF0

MF1

MF1.5

MF2

Intra-beta

ESEWNW

VeryShallow

5km

of

rese

rvoir

sect

ion

Geological Setting & Reservoir Characteristics

10,000s Multi-layered deltaic reservoirs (~30 reservoirs per well)

~2m thickness

Highly heterogeneous on the lateral and vertical connectivity

Highly heterogeneous on pressure regime & fluid properties

TUNU field is maturing

Depleted reservoirs

Risk of water rise

TUNU FIELD CHARACTERISTICS

70

km

20km

Tunu MainZone only

3

Slide 3

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 4

Tubing clear all the way to the bottom of thewell

Cement bond log from bottom to top of cement

Nitrogen kick-off to unload completion brine

Maximum unload to create low wellbore pressure

Perforate with DUB

Well clean up

Remove remaining completion brine andperforation debris

INTERVENTION TECHNIQUE TO PERFORATE NEW WELLS

MAIN INTERVENTION SEQUENCE

0

500

1000

1500

2000

2500

3000

3500

4000

2005 2006 2007 2008 2009 2010 2011 2012 2013

South

North

PERFORATED LENGTH (METERS)

The DUB perforating technique along with the nitrogen kick-off technique has been used in many wells inthe TUNU gas field; nine (9) of these wells are included in this paper.


Slide 5

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

Slide 6


Pre-job estimated productivity calculated based on an integrated toolbox considering several parameters,such as porosity, mobility, reservoir pressure and other reservoir characteristic.

Typical Wireline Jobs for Gas wells: Max safe SUB << Max DUB

Slide 7


DUB cleanup > SUB cleanup > DOB cleanup

Slide 8


The importance of perforating damage cleanup

Slide 9


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




Wellbore Dynamics – Very Low Weak-Point Load – Animation


Wellbore Dynamics – Gunshock Loads – Up to 0.04 sec

Slide 13


Pressure at the fast gauge – Measured vs. Simulated

Slide 16


Comparison between the Concrete-based and the Rock-based model

Slide 17


Comparison between the Concrete-based and the Rock-based model


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




Wellbore Dynamics – Bottom Gauge Pressure - Animation


Wellbore Dynamics – Up to 0.04 sec



DUB amplitude around the gun is larger than at the bottom gauge


Pressure at the fast gauge – Measured vs. Simulated


Conclusions

Slide 24


• 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

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 ?

Wireline Perforating Technology Maximizes Well Productivity • Risal Rahman

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Wireline Perforating Technology Maximizes Well Productivity • Risal Rahman

IPS-14-22 Wireline Perforating Technology Maximizes … Productivity and Minimizes Operational Risks...

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