...Yongsheng Liu; Xing Qin; Yuchen Sun; Zijun Dou; Jiansong Zhang; Guoqiang Chen Aiming at the oscillation drag reduction tool that improves the extension limit of coiled tubing downhole operations, the fluid hammer equation of the oscillation drag reducer is established based on the fluid hammer...

... of turbulence drag reduction might be as follows: first, the polymer molecules have a structure that can affect the turbulent vortex, making the flow field more orderly like laminar. Then, during the process of transferring energy from the large eddy to the small eddy, part of the energy is transformed...

...R. L. J. Fernandes; B. A. Fleck; T. R. Heidrick; L. Torres; M. G. Rodriguez Experimental investigation of drag reduction in vertical two-phase annular flow is presented. The work is a feasibility test for applying drag reducing additives (DRAs) in high production-rate gas-condensate wells where...

... existing differential pressure data. 05 04 2006 05 09 2007 02 01 2008 drag reduction multiphase flow pipe flow In evaluating the differential pressure data from a drag reduction study in this laboratory, a major issue was how to characterize intermittent flow patterns...

...Mutaz Daas; Derek Bleyle Measurements of drag reduction in two-phase oil-gas slug flow are presented in this study. Two types of oil with markedly different viscosities were examined in 10-cm inner diameter horizontal pipes to evaluate the influence of oil viscosity on the total pressure loss...