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RESEARCH PAPERS: Non-Newtonian Behavior and Rheology

Rheological and Hydraulic Properties of Welan Gum Fluids in Straight and Coiled Tubings

[+] Author and Article Information
Adedeji Asubiaro

Mewbourne School of Petroleum and Geological Engineering, Well Construction Technology Center, The University of Oklahoma, T-301 Sarkeys Energy Center, 100 Boyd Street, Norman, OK 73019-1003adedejiasu_biaro@ou.edu

Subhash N. Shah

Mewbourne School of Petroleum and Geological Engineering, Well Construction Technology Center, The University of Oklahoma, T-301 Sarkeys Energy Center, 100 Boyd Street, Norman, OK 73019-1003subhash@ou.edu

J. Fluids Eng 130(8), 081506 (Jul 29, 2008) (16 pages) doi:10.1115/1.2907414 History: Received June 26, 2007; Revised February 05, 2008; Published July 29, 2008

This study involves experimental investigation of the hydraulic characteristics of aqueous based welan gum fluids of concentrations 1.4kgm3, 2.9kgm3, 5.7kgm3, and 8.6kgm3 in both straight and coiled tubings at 21°C, with particular emphasis on the effect of polymer concentration and coiled tubing curvature ratio. The flow loop available at the Well Construction Technology Center of the University of Oklahoma, consisting of 1.27cm straight and coiled tubings (with curvature ratios of 0.01, 0.019, and 0.031), was utilized. It was observed that for all welan gum fluids investigated, friction losses in coiled tubing were significantly higher than those in straight tubing. In addition, increasing coiled tubing curvature ratio brings about higher friction loss for all fluids investigated. Rheological data for these fluids were obtained using a Model 35 Fann viscometer. Friction pressure data gathered from flow experiments are analyzed and correlations for friction pressure loss prediction of welan gum fluids have been developed for both straight and coiled tubings. These correlations, which represent the industry’s first attempt in the fundamental investigation of friction loss prediction of welan gum fluids, are found to provide good accuracy when compared to the experimental data. Flow behavior of welan gum fluids is compared with 4.9kgm3 guar fluid. It is found that in both straight and coiled tubings, the guar fluid exhibited higher drag reduction when compared to the welan gum fluids investigated in this study.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Molecular structure of welan gum

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Figure 2

Schematic diagram of experimental setup

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Figure 3

Rheograms of welan gum fluids investigated

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Figure 4

Apparent viscosity versus wall shear rate plots for welan gum fluids

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Figure 5

Water flow data through 1.27cm o.d. straight and coiled tubings (r∕R=0.01)

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Figure 6

Water flow data through 1.27cm o.d. straight and coiled tubings (r∕R=0.019)

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Figure 7

Water flow data through 1.27cm o.d. straight and coiled tubing (r∕R=0.031)

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Figure 8

Friction factor of welan gum fluids in 1.27cm o.d. straight pipe

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Figure 9

Friction factor of welan gum fluids in 1.27cm o.d. coiled tubing (r∕R=0.01)

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Figure 10

Friction factor of welan gum fluids in 1.27cm o.d. coiled tubing (r∕R=0.019)

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Figure 11

Friction factor of welan gum fluids in 1.27cm o.d. coiled tubing (r∕R=0.031)

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Figure 12

Effect of curvature ratio on friction factor of 1.43kg∕m3 welan gum

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Figure 13

Effect of curvature ratio on friction factor of 2.85kg∕m3 welan gum

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Figure 14

Effect of curvature ratio on friction factor of 5.7kg∕m3 welan gum

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Figure 15

Effect of curvature ratio on friction factor of 8.6kg∕m3 welan gum

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Figure 16

Comparison between predicted and experimental friction factors for welan gum fluids in straight pipe

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Figure 17

Comparison between predicted and experimental factors for welan 90m fluids in CT (r∕R=0.01)

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Figure 18

Comparison between predicted and experimental friction factors for welan gum fluids in CT (r∕R=0.019)

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Figure 19

Comparison between predicted and experimental friction factors for welan gum fluids in CT (r∕R=0.031)

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Figure 20

Comparison between predicted and experimental friction factors for welan gum fluids

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Figure 21

Molecular structure of guar gum

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Figure 22

Apparent viscosity comparison between welan gum and guar fluids

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Figure 23

Comparison between welan gum and guar fluids for flow in straight tubing

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Figure 24

Comparison between welan gum and guar fluids for flow in coiled tubing (r∕R=0.01)

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Figure 25

Comparison between welan gum and guar fluids for flow in coiled tubing (r∕R=0.019)

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Figure 26

Comparison between welan gum and guar fluids for flow in coiled tubing (r∕R=0.031)

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