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

SGU1.1 2.1

GRGAPI0 150

volV/V0 1

RTOHMM0.2 20

TGPPM0 10

dtUS/F240 40

0.910.85

0.720.72

0.570.570.65

0.740.74

0.470.48

1.051.05

0.590.590.620.570.570.57

5a-25b

5c-15c-2

TD_DRILLER

O110O110

Q105Q105Q105

Res name

NPHIV/V0.6 0

G/C31.7 2.7LAUQI_1

V/V0 4

Originalwater

Gas(various

pressures0.2-1.5)

Waterrise

High PressureBelly

>=1.20sg

Fluviatil channelDistributary channelMouth bar

FreshWaterSand

Intra-beta

ESEWNW

VeryShallow

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

Tunu MainZone only

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

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

2005 2006 2007 2008 2009 2010 2011 2012 2013

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.

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.

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

DUB cleanup > SUB cleanup > DOB cleanup

The importance of perforating damage cleanup

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

Pressure at the fast gauge – Measured vs. Simulated

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

• 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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