Comparative study of yield-power law drilling fluids flowing through annulus

Ozbayoglu M. E., Omurlu C.

PETROLEUM SCIENCE AND TECHNOLOGY, vol.25, no.8, pp.1041-1052, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 8
  • Publication Date: 2007
  • Doi Number: 10.1080/10916460600695181
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1041-1052
  • Keywords: annular flow, frictional pressure, Herschel Bulkley, non-Newtonian, pipe flow, yield-power law (YPL), LAMINAR-FLOW
  • Middle East Technical University Affiliated: No


An exact solution for calculating the frictional pressure losses of yield-power law (YPL) fluids flowing through concentric annulus is proposed. A solution methodology is presented for determining the friction factor for laminar and nonlaminar flow regimes. The performance of the proposed model is compared to widely used models as well as the experimental results of 10 different mud samples obtained from the literature. The results showed that the proposed model could estimate the frictional pressure losses with an error of less than 10% in most cases for both laminar and nonlaminar flow regimes, more accurately than the widely used models available in the literature.