Experimental lost circulation and performance simulation studies of 60/40, 70/30, 80/20 and 90/10 OBMs
Master thesis
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http://hdl.handle.net/11250/300827Utgivelsesdato
2015-06-15Metadata
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Sammendrag
Lost circulation has been and still is a cost factor for the drilling industry. By using
lost circulation material in drilling fluid, it is possible to mitigate unnecessary loss of
drilling fluid.
This thesis presents characterization, performance simulation and lost circulation
performances of four types of oil based mud systems. These are of 60/40, 70/30,
80/20 and 90/10 oil-water ratio. The characterization part deals with rheology
measurement and modelling at various temperatures, and is based on direct
experimental measurements. The performance simulation study deals with the hole
cleaning efficiency of the drilling fluids. The lost circulation part deals with the
bridging performance of the drilling fluids at various simulated fracture widths. For
the experiment, 13.82 lb/bbl LC-lube (graphite) was used as lost circulation material.
The results show that particle size distribution with a D50 at or higher than the
fracture width gives a better performance in terms of bridge strength. Similar results
have also been documented in previous works. For the studied mud systems, three
rheological parameters also show good correlation with the bridge collapse pressure.
Beskrivelse
Master's thesis in Petroleum engineering