AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Drilling hydraulics annular reynolds12/28/2022 ![]() ![]() ![]() North Sea field data is used as an example. In this paper, all the above mentioned phenomena and their consequences for annular pressure losses will be discussed in detail. These localised pressure losses will again be coupled with the rheological properties of the drilling fluids. In addition to these phenomena washouts and tool joints will create localised pressure losses. These differences may be sufficiently large to require different models for two water based drilling fluids built with different types of polymers. Furthermore, within both water based and oil based drilling fluids there are functional differences. Water based drilling fluids are normally constructed as a polymer solution while the oil based are combinations of emulsions and dispersions. It is impossible to use the same frictional pressure loss model for water based and oil based drilling fluids even if their viscosity profile is equal because of the different ways these fluids build viscosity. These rheological properties include more properties than the viscosity as measured by API procedures. Naturally, the rheological properties of the drilling fluid play an important role. Consequently, the annular frictional pressure loss is increased even though the drilling fluid becomes thinner because of added shear rate. Transversal motion of the drillstring creates vortices that destabilize the flow. The drillstring rotation, even for fairly small rotation rates, creates unstable flow and sometimes turbulence in the annulus even without axial flow. The drillstring motion itself also affects the pressure loss significantly. Moving the drillstring to the wall generates a wider flow channel in part of the annulus which reduces the frictional pressure losses significantly. First of all, the pressure losses depend on the annulus eccentricity. To predict these pressure losses, however, is not straightforward. Journal of Verification, Validation and Uncertainty QuantificationĬontrolling the annular frictional pressure losses is important in order to drill safely with overpressure without fracturing the formation.Journal of Thermal Science and Engineering Applications.Journal of Offshore Mechanics and Arctic Engineering.Journal of Nuclear Engineering and Radiation Science.Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems.Journal of Nanotechnology in Engineering and Medicine.Journal of Micro and Nano-Manufacturing.Journal of Manufacturing Science and Engineering.Journal of Engineering Materials and Technology.Journal of Engineering for Sustainable Buildings and Cities.Journal of Engineering for Gas Turbines and Power.Journal of Engineering and Science in Medical Diagnostics and Therapy.Journal of Electrochemical Energy Conversion and Storage. ![]() Journal of Dynamic Systems, Measurement, and Control.Journal of Computing and Information Science in Engineering.Journal of Computational and Nonlinear Dynamics.Journal of Autonomous Vehicles and Systems.ASME Letters in Dynamic Systems and Control.ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B: Mechanical Engineering.Mechanical Engineering Magazine Select Articles. ![]()
0 Comments
Read More
Leave a Reply. |