Research Article
Performance of non-Newtonian fluid in vertical annuli with and without rotation of inner cylinder
@INPROCEEDINGS{10.4108/eai.28-6-2020.2297928, author={Lina Jassim and Basima Khalaf and Abeer Hashim}, title={Performance of non-Newtonian fluid in vertical annuli with and without rotation of inner cylinder}, proceedings={Proceedings of the 1st International Multi-Disciplinary Conference Theme: Sustainable Development and Smart Planning, IMDC-SDSP 2020, Cyperspace, 28-30 June 2020}, publisher={EAI}, proceedings_a={IMDC-SDSP}, year={2020}, month={9}, keywords={rans; annular flow; inner wall rotation; wall shear stress; axial velocity; drilling}, doi={10.4108/eai.28-6-2020.2297928} }- Lina Jassim
Basima Khalaf
Abeer Hashim
Year: 2020
Performance of non-Newtonian fluid in vertical annuli with and without rotation of inner cylinder
IMDC-SDSP
EAI
DOI: 10.4108/eai.28-6-2020.2297928
Abstract
A simulation model of non-Newtonian fluid in vertical, concentric annular flow is used in this work. A prototype of a drilling device is manufactured to compare with the simulation results. Water-based mud rheology is described here with the Bingham plastic model. The simulation results reveal that Bingham plastic fluid has a good attitude during drill pipe rotation in terms of axial velocity, tangential velocity, and molecular viscosity. This influence of rotation on the axial velocity is mirrored in the behavior of the shear stresses inside annular space and hence on the friction factor. However, the rest situation of the drill pipe results in high fluid viscosity. Furthermore, it is found that 0.2 of eccentricity leads to increase the pressure drop inside annuli. Bingham plastic fluid has a great dependence on temperature, and the temperature decreases from top to bottom. This behavior occurs since Bingham fluid flows from up to down during drilling.
