TUSTP 2003TUSTP 2003

byErzhan KuantaevErzhan Kuantaev

byErzhan KuantaevErzhan Kuantaev

May 20, 2003May 20, 2003

Evaluation of Oil-Water Flow through

Piping Restrictions

Evaluation of Oil-Water Flow through

Piping Restrictions

Outline Outline

Introduction

Objectives

Experimental Results

Conclusion

Future Work

IntroductionIntroduction

• Flow conditioning upstream of compact separators can improve their performance and separation efficiency

• Study of water-oil mixture flow through different piping restrictions can help reduce droplet breakup and promote coalescence

ObjectivesObjectives

Compare oil-water separation in Batch Separator for different restrictions

Improve design of restrictions for more efficient oil-water separation

Experimental Program Experimental Program

Experimental Facility

Experimental Results

By pass valve

Batch Separators

Flow Restrictions

Floor Level

5’

1.5’

2’

15’ - 20’

Inlet Outlet

Experimental FacilityExperimental Facility

Restrictions GeometryRestrictions Geometry

Vs.

Vs.

Batch Separator Batch Separator

Batch Separator Batch Separator

Experimental ResultsExperimental Results

Text matrix:Text matrix:

- Orifices – square and circular - Orifices – square and circular

- Rectangular venturi and channel- Rectangular venturi and channel

- Water cut (25%, 50%, 75%) - Water cut (25%, 50%, 75%)

- Mixture velocities (1 - 5 ft/s)- Mixture velocities (1 - 5 ft/s)

Orifice ResultsOrifice Results Vm=1.5 ft/s, WC=50%

0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

40.00

45.00

0 200 400 600 800 1000

Time (sec.)

WH

, O

H (

cm

)

WH (Circular)

OH (Circular)

WH (Square)

OH (Square)

Orifice ResultsOrifice Results

0

200

400

600

800

1000

1200

1400

10.0 20.0 30.0 40.0 50.0

Orifice Mixture Velocity (ft/s)

95%

Sep

arat

ion

Tim

e (s

ec.)

WC=25% (Circular) WC=50% (Circular) WC=75% (Circular)WC=25% (Square) WC=50% (Square) WC=75% (Square)

Orifice ResultsOrifice Results

100200300400500600700800900

1000110012001300

0.00 2.00 4.00 6.00 8.00

DP, psid

95

% S

ep

ara

tio

n T

ime

, se

c

WC=75% (Square) WC=50% (Square) WC=75% (circular)WC=50% (circular) WC=25% (Square) WC=25% (circular)

Orifice ResultsOrifice Results Pressrue Drop Comparison

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0

Orifice Mixture Velocity, ft/s

Pre

ssu

re d

rop

, p

sid

WC=75% (Square) WC=50% (Square)

WC=25% (Square) WC=75% (Circular)

WC=50% (Circular) WC=25% (Circular)

Venturi Results Venturi Results

Vm=2.5 ft/s, WC=75%

28.00

30.00

32.00

34.00

36.00

38.00

40.00

42.00

44.00

0 50 100 150 200 250 300 350 400 450 500

Time (sec.)

WH

, O

H (

cm)

"OH - Rectangular"

"WH - Rectangular"

"OH - Venturi"

"WH - Venturi"

Final separation time

Venturi ResultsVenturi Results

0200400600800

10001200

0.0 10.0 20.0 30.0 40.0 50.0Nozzle Mixture Velocity, ft/s

95%

Sep

arat

ion

tim

e, s

ec

WC=25% (Venturi) WC=25%(Rectangular) WC=50% (Venturi) WC=75% (Venturi)WC=50% (Rectangular) WC=75% (Rectangular)

Venturi ResultsVenturi Results

00.5

11.5

22.5

33.5

44.5

0.0 10.0 20.0 30.0 40.0 50.0

Nozzle Mixture Velocity (ft/s)

DP

(p

sid

)

WC=25% (Venturi) WC=50% (Venturi)WC=75% (Venturi) WC=25%(Rectangular)WC=50%(Rectangular) WC=75%(Rectangular)

ConclusionsConclusions

Orifice Orifice

- Separation time - Separation time less for flow through circular less for flow through circular geometry as compared to rectangular geometrygeometry as compared to rectangular geometry

- Pressure drop almost the same for both geometries- Pressure drop almost the same for both geometries

ConclusionsConclusions

VenturiVenturi

- Separation time less for venturi geometry as - Separation time less for venturi geometry as compared to rectangular channelcompared to rectangular channel

- Venturi exhibits less pressure drop than - Venturi exhibits less pressure drop than rectangular channelrectangular channel

Future WorkFuture Work

More data needs to be acquired for higher pressure More data needs to be acquired for higher pressure dropdrop

More studies needed to understand effect of different More studies needed to understand effect of different restriction geometries on droplet breakup/coalescencerestriction geometries on droplet breakup/coalescence

Improve instrumentations (Laser/Fiber Optic)Improve instrumentations (Laser/Fiber Optic)

Develop model for prediction of droplet size Develop model for prediction of droplet size distribution through piping restrictionsdistribution through piping restrictions