Experimental Study on Automatic Evaluation of Drilling Fluid Properties
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The drilling fluid has several important functions such as transporting cuttings out of the well and being a primary barrier during the drilling operation. When drilling challenging wells in the present and future, factors like safety, time and cost efficiency are important to consider. A system that could deliver live data of fluid density and viscosity in the well would improve the bottom hole pressure control, and further help to save time and avoid fatal accidents. The instrumented standpipe concept evaluated in this thesis can potentially deliver improved bottom hole pressure control to the drilling crew by estimating density and viscosity in real time. Last year, a flow loop was constructed in the drilling hydraulics laboratory as a bachelor thesis to evaluate the instrumented standpipe concept. This thesis is a thorough experimental test of the flow loop and its potential to deliver stable live data of density and viscosity. Horizontal and vertical differential pressure are used to estimate density and viscosity of both Newtonian and non-Newtonian fluid in laminar and turbulent flow regime. The test results indicated inaccurate differential pressure readings at first. After calibrating the flow loop with water and adding an offset correction to the differential pressure, the system proved good results both for Newtonian and non-Newtonian fluids. The flow loop still needs some further modifications. Pressure sensors should be ex- changed to give more reliable data. Different fluid mixes should also be tested.
Master's thesis in Petroleum engineering