CFS Technology Development

David HortonTechnical Advisor

CFS Technology Developments

© 2009 Halliburton. All Rights Reserved. 2

• CFS-488 Viscosifying Polymer

• CFS-485 Microemulsion Technology

• CFS-461 Emulsion Prevention

• Utilizing our Technology

Current Developments


CFS-488Polymeric Viscosifier


CFS-488CFS-488: A viscosifying polymer for utilization in drilling fluids and brines.

Primary function is viscosity and suspension

Other advantages:Reservoir friendlyAcid solubleEfficient brine solubilityCombines properties of HEC acid solubility and suspension of Xanthan gum


CFS-488 RheologyCFS-488 Performance vs Xanthan at 1.5 lb/bbl in

FreshwaterPolymer CFS-488 BARAZAN D PLUS

Fann 35 dial reading600 30 24300 23 19200 18 18100 13 156 7 93 6 7

PV 7 5YP 16 14

10 s gel 8 810 min gel 13 10

CFS-488 BARAZAN D PLUS

BARAZAND PLUS

Static settling test of polymer fluidsfor 4 hr with 80 lb/bbl 20/40 meshsand.

CFS-488

Which one is better?


CFS-488 Extreme Low-end Rheology

Comparison of various polymers in a 13.5 lb/gal CaCl2 / CaBr2 (20 oF blend)

Excellent performance in divalent brines

Shear thinning curve shows superior low-end rheology for improved suspension

1 % Biopolymers in 13.5 lb/gal CaBr2

10

100

1000

10000

100000

1000000

0.01 0.1 1 10 100

Shear Rate (s-1)

Visc

osity

(cP)

CFS-488

HEC

XAN

SCL


CFS-488 Acid Degradation

Acid degradation testing of CFS-488 shows rapid breakdown of polymer under acidic conditions

Preferred property for ease of removal from reservoir with minimal formation damage

Acid Degradation Testing

0

20

40

60

80

100

25 75 125 175 225 275 325 375 425

Time (m)

Visc

osity

(cp)

pH 3

pH 8

FANN 50 testing at 175 oF and 100 rpm1 % polymer in 10.0 lb/gal NaBr


CFS-488 Cake Clean-up

10 micron disc

3 Hours of treatment with N-FLOW 325 (10 % vol) at 120 oF


Field ApplicationCFS-488 was mixed in fresh water at 2ppb concentration. Full yield of the sweep occurred within 20 minutes.

No de-foamer was added.No “fish-eyes” occurred.Rheology of the sweep:PV (cp@120F)

YP (lb/100 sq ft)

Gel (10sec)

Gel (10min)

600 (rpm)

300 (rpm)

200 (rpm)

100 (rpm)

6 (rpm)

3 (rpm)

10

32

13

27

52

42

33

21

9

6

*Fann 35 Model


CFS-488 Sweep Performance

A 15bbl sweep achieved efficient hole cleaning.Foaming was observed to be less than that of previous xanthan sweeps.Customer was pleased withproduct performance.

sweep foaming

sweep returns at shaker


CFS-488 Utilization

Extreme low-end rheology aids hole cleaning and suspension.Acid degradation allows for effective wellboreclean-up.Effective solubility in any brine overcomes technical challenges.


CFS-485Microemulsion Technology


CFS-485 Microemulsion Technology

Cleans casing and water-wets surfacesDisplacements

Removes oils in place of solventsLeaves surfaces fully water-wetMeets GoM Environmental standards


True Microemulsion?

Windsor IOil and oil-in-water phase

Windsor IIOil external – Water internal(as in OBM)Kinetically stabilized macroemulsion

Windsor IIIBicontinuous (neither water –nor oil-external)Unstable microemulsion-requires shear

Windsor IVSingle phase microemulsionClear

I II III IV


Why Does It Matter?

Windsor III - emulsionLarge amount of energy to create emulsionKinetically stable Cloudy (will separate)

Windsor IV - microemulsionNo energy input to createThermodynamically stable (the way nature wants it)Clear (will not separate)

IV

III


OBM

CFSTM-485/ Densified Viscosified

Brine

Viscosified

Thinner

DensifiedViscosified

Brine

Surfactant

Viscosified

Solvent

OBM

Thinner

CFS™-485 Conventional

Reduce Rig Operating Time

Reduces Spacer VolumesReduces mixing & pumping timesGoM Environmentally CompliantEliminates the use of Solvents Surfactant

Solvent

GoM Spacer Train


CFS-485 Utilization

Casing cleaner alternative to solvent Easily mixed at rig siteReduces over-all spacer train volumesLeaves surfaces clean and water-wetMeets GoM Environmental standards


CFS-461Emulsion Prevention


Emulsion Blockage

Emulsions formed inside Formation. Some zones form water/oil emulsion naturally. Water-in-oil emulsion is viscous and blocks flow.

How do we prevent Emulsion Blockage?

Utilize chemical solutions Limit any excess emulsifier in IEF Control Filtrate Loss


Emulsion Prevention


CFS-461 A Green Alternative: Toxicity & Biodegradability assigned GOLD rating using CHARM classification.

•Prevents Emulsion from forming

•Encourages rapid break-out


CFS-461 Utilization

Proper planning of IEFMinimize excess emulsifierMinimize filtrate invasion

Lab Test for proper concentrations in brineDo not over-treat“Green” alternative to previous technology


Questions?

CFS Technology Development

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