Computational Fluid Dynamics Study to Access the Effect of Non-Newtonian Fluid Flow Variables on Drilling Mud in Annular Oil Well

DOI: 10.14800/IOGR.1292

Abstract

During the drilling operations, a non-Newtonian fluid type comes out of the space between the drill bit and the well diameter. After the drilling operation, to strengthen the well and prepare an insulating membrane around the well, a metal shell with a diameter smaller than the diameter of the well is installed at a distance from the well and often outside the center. In the well, the fluid inside the mud wells is directed from the drilling to the outside. The main problem that has attracted the attention of researchers is the investigation and calculation of the physics of fluid flow inside these circular spaces. Studying flow physics in laboratories is very expensive, which increases the cost of product design and the product's final price. The movement of drilling mud between the drill bit and the well can be simulated as a non-Newtonian fluid flow inside eccentric tubes where the inner tube is rotating, using computational fluid dynamics. This study aims to numerically simulate the parameters affecting the physics of drilling mud fluid (non-Newtonian fluid) in the space between two non-central cylinders. The flow is incompressible, and with increasing rotation speed, the greater penetration of the boundary layer into the shear stress ring penetrates more inside. It causes the non-Newtonian viscosity values to decrease. It penetrates the mainstream and decreases the non-Newtonian viscosity, more significant than the rotational velocity effect.