Xanthan and Welan: The Effects of Critical Polymer Concentration on Rheology and Fluid Performance

Powell, J.W.; Parks, C.F.; Seheult, J.M.

doi:10.2118/22066-ms

Cited by 36 publications

(9 citation statements)

References 12 publications

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“…The LSRV has been shown to correlate to the transport properties of xanthan and welan-based fluids. 5 Diutan exhibited higher LSRVs than xanthan and welan. For an LSRV of 27,000 cp, 1 lb/bbl diutan had the same viscosity as 1.38 lb/bbl xanthan and 1.68 lb/bbl welan.…”

Section: Resultsmentioning

confidence: 85%

New Biopolymers for Drilling, Drill-In, Completions, Spacer, and Coil-Tubing Fluids, Part II

Navarrete¹,

Seheult²,

Coffey³

2001

Proceedings of SPE International Symposium on Oilfield Chemistry

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractXanthan gum has been used extensively as a viscosifier in the oil industry for different applications due to its unique rheological properties. In this paper we describe the properties of two previously introduced bio-polymers for use in drilling, drill-in, completions, spacer fluids and coiled tubing applications. The first bio-polymer yields higher viscosities and better temperature stability at lower polymer concentrations than welan and xanthan gum due to its higher molecular weight; this polymer is particularly effective in low salt fluids. The second bio-polymer has improved solubility in high density CaCl 2 brines.Viscosity data over a wide shear rate range in different brine systems is presented comparing the new bio-polymers with xanthan and welan gum at temperatures between 75 o F to 330 o F. The effect of different types of solids and friction pressure tests in coiled tubing are presented, showing diutan's friction reduction properties.

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Section: Resultsmentioning

confidence: 85%

New Biopolymers for Drilling, Drill-In, Completions, Spacer, and Coil-Tubing Fluids, Part II

Navarrete¹,

Seheult²,

Coffey³

2001

Proceedings of SPE International Symposium on Oilfield Chemistry

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“…As polymer concentration increases, intermolecular associations increase exponentially; physically via molecular entanglements, and chemically through hydrogen bonding, forming complex structured networks [12].…”

Section: Fig 7: Rheology Curves At Ambient Temperaturementioning

confidence: 99%

A Comparative Investigation of Rheological and Flow Behavior Among Clean Polymeric and Surfactant Based Fluids

Kamel

2016

Volume 5: Education and Globalization

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This study involves experimental investigation of rheological and hydraulic characteristics of aqueous based polymeric and surfactant fluids in straight and coiled tubing. The fluids matrix includes guar, HPG, PHPA, welan, xanthan, and surfactant. Bohlin rheometer was used to evaluate rheological and viscoelastic characteristics. For hydraulic characteristics, small-and large-scale flow loops were used.It is observed that all fluids exhibit comparable non-Newtonian behavior and improved viscous and elastic properties. Among polymeric fluids, guar and welan provide better viscosity and suspension properties. Surfactant is significantly affected by the formation of rod-like micelles and other microstructures. Master curves for rheological and elastic properties are developed using the molecular theory approach. The foremost benefit of these curves is its dimensionless form that provides a unique technique to predict viscosity for all fluids.For hydraulic properties, friction losses in coiled tubing are significantly higher than in straight tubing due to centrifugal forces and secondary flows. Surfactant is more sensitive to shear field applied where different microstructures are induced and thus they exhibit better drag reduction characteristics than polymeric fluids especially in coiled tubing with larger sizes. However, in straight tubing, guar shows better drag reduction characteristics than surfactant and other polymers, which diminishes as tubing size increases. However, welan gum exhibits a comparable performance. Overall, all fluids are considered good candidates as fracturing fluids with specific features for each. Unique characteristics of each fluid is discussed and explained in more details within the context of the present paper.

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“…However, it does not set up a structure because its electrostatic forces are predominately repulsive (Caenn et al, 2011). When the fluid is in motion, the chains tend to arrange themselves parallel to the direction of the flow resulting in the increase of shear rate and reduction of the effective viscosity (Powell et al, 1991).…”

Section: Effect Of Xgmentioning

confidence: 99%

Herschel–Bulkley rheological parameters of lightweight colloidal gas aphron (CGA) based fluids

Ziaee¹,

Arabloo²,

Ghazanfari³

et al. 2015

Chemical Engineering Research and Design

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Xanthan and Welan: The Effects of Critical Polymer Concentration on Rheology and Fluid Performance

Cited by 36 publications

References 12 publications

New Biopolymers for Drilling, Drill-In, Completions, Spacer, and Coil-Tubing Fluids, Part II

New Biopolymers for Drilling, Drill-In, Completions, Spacer, and Coil-Tubing Fluids, Part II

A Comparative Investigation of Rheological and Flow Behavior Among Clean Polymeric and Surfactant Based Fluids

Herschel–Bulkley rheological parameters of lightweight colloidal gas aphron (CGA) based fluids

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