WorkShop EOR, IAPG, Neuquen, 3-5 November 2010 1 Microgel Technology for Water Shutoff Applications Alain Zaitoun, Poweltec Guido Poggesi, REP WorkShop

11WorkShop EOR, IAPG, Neuquen, 3-5 November 2010

Microgel Technology for Water

Shutoff Applications

Alain Zaitoun, Poweltec

Guido Poggesi, REP

WorkShop EOR, IAPG, Neuquen, 3-5 November 2010


Outline

• What is Microgel?

• Water Shutoff basics

• Field case gas storage well

• Field cases heavy oil horizontal wells

• Conclusions/Perspectives


New Microgel Technology

dH 0.3 m

Small microgelMicrogel A Microgel B

Linear chain

Linear polymer

With new microgel technology, chemistry, thickness and consistency of polymeric species can be modified to fit with actual reservoir conditions

dH 2.0 m

POWELTEC


• Microgel lots size 0.3 – 1.0 – 2.0 µm

• Broad permeability range (10-10 000 mD)

• Commercially available under emulsion and powder

forms

• High temperature stability (up to 165°C)

• High shear stability (20 000 sec-1)

• High chemical stability (CO2, H2S, high salinity)

• Environmentally friendly (PLONOR N. Sea yellow list)

• Efficient in WSO and Sand Control applications

Microgel Tecnology = Where we are today


Several Microgel products proposed Several Microgel products proposed today today

• ““Brightwater” (Popping microgel)Brightwater” (Popping microgel)

• ““Colloidal Dispersion Gels” (CDG)Colloidal Dispersion Gels” (CDG)

• ““SMG” (Small calibrated microgels)SMG” (Small calibrated microgels)

• ““PPG” (Preformed Particle Gels to plug thief zones)PPG” (Preformed Particle Gels to plug thief zones)

• More used for Conformance Injection well More used for Conformance Injection well

treatments (except SMG)treatments (except SMG)


Water Shutoff Water Shutoff


Principe of WSO by RPM PolymersPrincipe of WSO by RPM Polymers

W

Oil Oil

Water

Oil Oil

Water Water Water

Water Oil Oil

Water

Low k

High K

Two-layer model

Swollen orweakly

X-linked polymer


Modification of Relative Permeability by Polymer Adsorption

(Sor)(Sor)

(Swi)(Swi)

Adsorbed polymer or microgels

before polymer

after polymer

RRF=10

PRINCIPLE OF RPM TREATMENTS


Example of integrated study: Example of integrated study:

Water Shutoff in a Water Shutoff in a

Gas storage wellGas storage well

Cerville (GDF)Cerville (GDF)((SPE 106042SPE 106042))

POWELTEC


Grès à Voltzia

Restriction de perméabilitéAquifère

VA36

Model construction



WSO GDF Cerville: Main outcomes from integrated studyWSO GDF Cerville: Main outcomes from integrated study

• Treatment design by lab and reservoir simulation study

• Optimal volume = 50 m3

• Water expected strongly reduced (Factor 3)

• Pressure constraints during microgel injection is expected to be

the sensitive parameter for operational issues (verified in field)

Results

• Treatment successful

• Well behavior in good agreement with simul. forecasts


2001_2002 2002_2003 2003_2004 2004_2005 2005_2006

Effect of Microgel WSO treatment Effect of Microgel WSO treatment on gas wellon gas well

Wate

r G

as

Rati

oW

ate

r G

as

Rati

o

Microgel Treatment


000E+00

05E+06

10E+06

15E+06

20E+06

25E+06

2001

-200

2

2002

-200

3

2003

-200

4

2004

-200

5

2005

-200

6

well #0

well #1

well #2

well #3

well #4

well #5

Microgel treatmentMicrogel treatment

Effect of Microgel WSO treatment Effect of Microgel WSO treatment on gas wellon gas well


Microgel Treatment of gas well= Sand Microgel Treatment of gas well= Sand Control Control Sand production Sand production beforebefore treatment treatment

Measurements made by G. RIGOLLET-GOUSSU & M.G. GROUGON

Qgas

san

d (

u.a

.)

dec_2004 (88% stock Max)jan_2005 (76% stock Max)feb_2005 (68% stock Max)

Qgas

san

d (

u.a

.) dec_2005 (94% stock Max)janv_2006 (85% stock Max)janv_2007 (84% stock Max)

Sand production Sand production afterafter treatment treatment

MicrogelMicrogel treatment in well X0 treatment in well X0


Example of successfull WSO treatment:Pelican Lake Horizontal Well 11-15A (Canada)

100200300400500600700800900

1000

juil-8

5

avr-8

8

juin-

88

oct-8

8

avr-8

9

juin-

89

oct-8

9

avr-9

0

juin-

90

oct-9

0

avr-9

1

juin-

91 0 %10 %20 %30 %40 %50 %60 %70 %80 %90 %100 %

WaterOilWater Cut

Year 1 Year 2 Year 3 Year 4

Mo

nth

ly P

rod

uct

ion

(m

3)

Treatment

0


A successful WSO treatment in horizontal well (Canada)

0

1000

2000

3000

4000

5000

6000

7000

0 1000 2000 3000 4000 5000 6000

Cumulated Water Production (m3)

Sandcleaning

Incrementaloil

RPM treatment

Cu

mu

late

d O

il P

rod

uc

tio

n (

m3)


Example of integrated study: Example of integrated study:

Water Shutoff in a Water Shutoff in a

Heavy-Oil Horizontal Well with Heavy-Oil Horizontal Well with

Bottom AquiferBottom Aquifer

(Oman) (Oman)

POWELTEC


Candidate Well dataCandidate Well data

• High-permeability sandstone formation

• Oil viscosity = 200 cP, Temperature= 50°C, Salinity= 6 g/L TDS

• Horizontal well Open hole + screen 400 m long

• High water cut production (98%), bottom active aquifer

• Pumping Gross Production = 300 m3/d

Strategy

• Reservoir simulation to optimize WSO treatment

• Bullhead injection Microgel + Gel (RPM products)


Coreflood data

Near-wellbore reservoir model

Model construction and Polymer input data


Water rise in the wellbore

History matching

History matching


Polymer WSO treatment


WSO performances forecasts from reservoir simulations


Field Results in good agreement with predictions


• Microgels have great applications in WSO/Conformance

• Higher stability than conventional polymers

• Production well WSO by Microgels RPM attractive

• Easy option, low risk, low cost, quick payout

• Applicable in both oil and gas wells

• Bullhead injection in most cases easy handling

• Sand control effects can be also obtained

Conclusions/Perspectives

Documents

WorkShop EOR, IAPG, Neuquen, 3-5 November 2010 1 Microgel Technology for Water Shutoff Applications Alain Zaitoun, Poweltec Guido Poggesi, REP WorkShop