Effect of drag reducing polymers on oil-water flow in a horizontal pipe

Measurements of drag-reduction are presented for oil–water flowing in a horizontal 0.0254 m pipe. Different oil–water configurations were observed. The injection of water soluble polymer solution (PDRA) in some cases produced drag reduction of about 65% with concentration of only 10–15 ppm. The results showed a significant reduction in pressure gradient due to PDRA especially at high mixture velocity which was accompanied by a clear change in the flow pattern. Phase inversion point in dispersed flow regime occurred at a water fraction range of (0.33–0.35) indicated by its pressure drop peak which was disappeared by injecting only 5 ppm (weight basis) of PDRA. Effect of PDRA concentration and molecular weight on flow patterns and pressure drops are presented in this study. Influence of salt content in the water phase on the performance of PDRA is also examined in this paper.

[1]  R. Pal.  Pipeline flow of unstable and surfactant‐stabilized emulsions , 1993 .

[2]  B. A. Toms,et al.  Some Observations on the Flow of Linear Polymer Solutions Through Straight Tubes at Large Reynolds Numbers , 1948 .

[3]  E. H. Dunlop,et al.  Role of molecular aggregates in liquid drag reduction by polymers , 1974, Nature.

[4]  Thomas J. Hanratty,et al.  Influence of drag-reducing polymers on turbulence: effects of Reynolds number, concentration and mixing , 1999 .

[5]  Panagiota Angeli,et al.  Liquid-liquid dispersed flows in horizontal pipes , 1996 .

[6]  R. G. Rosehart,et al.  Gas-liqud slug flow with drag-reducing polymer solutions , 1972 .

[7]  Carcoana.  Applied enhanced oil recovery , 1992 .

[8]  H. A. Wahl,et al.  Flow Increase in the Trans Alaska Pipeline Through Use of a Polymeric Drag-Reducing Additive , 1982 .

[9]  L. Otten,et al.  Pressure drop and drag reduction in two‐phase non‐newtonian slug flow , 1976 .

[10]  Abdelsalam Al-Sarkhi,et al.  Effect of Drag Reducing Polymers on Two-Phase Gas–Liquid Flows in a Horizontal Pipe , 2004 .

[11]  M. Liberatore,et al.  Effectiveness of a drag reducing polymer: Relation to molecular weight distribution and structuring , 2003 .

[12]  Neima Brauner,et al.  Stability analysis of stratfied liquid-liquid flow , 1992 .

[13]  J. P. Brill,et al.  Drag reduction in two‐phase annular‐mist flow of air and water , 1976 .

[14]  G. Hewitt,et al.  DRAG REDUCTION WITH ADDITIVES IN MULTIPHASE FLOW: A LITERATURE SURVEY , 1999 .

[15]  R. H. J. Sellin,et al.  THE EFFECT OF DRAG-REDUCING ADDITIVES ON FLUID FLOWS AND THEIR INDUSTRIAL APPLICATIONS PART 1: BASIC ASPECTS , 1982 .

[16]  Arash Soleimani,et al.  Effect of drag-reducing polymers on pseudo-slugs––interfacial drag and transition to slug flow , 2002 .

[17]  R. M. Nedderman,et al.  Liquid film properties in two-phase annular flow , 1976 .

[18]  P. Angeli,et al.  Effect of drag-reducing polymers on horizontal oil–water flows , 2007 .

[19]  Jerry Westerweel,et al.  Experimental investigation of phase inversion in an oil–water flow through a horizontal pipe loop , 2006 .

[20]  P. Angeli,et al.  Phase inversion in dispersed liquid-liquid flows , 2005 .

[21]  E. Greskovich,et al.  Drag Reduction in Two-Phase Flows , 1971 .

[22]  E. Greskovich,et al.  Pressure drop and holdup in horizontal slug flow , 1971 .

[23]  Geoffrey F. Hewitt,et al.  Spatial Distribution of Oil and Water in Horizontal Pipe Flow , 2000 .

[24]  T. J. Hanratty,et al.  Effect of drag-reducing polymers on annular gas–liquid flow in a horizontal pipe , 2001 .