000			01865nab a2200205 4500
005			20260520002025.0
008			260224s2011 xxu
245	0	0	_aRheological and yield stress measurements of non-Newtonian fluids using a Marsh Funnel
260			_a _b _cjun. 2011
270			_a27/09/2011 ; 27/09/2011
300			_a10 p. ; 393-402
520			_aTranscripción del resumen del autor. Accurate and simple techniques for measurement of fluid rheological properties are important for field operations in the oil industry, but existing methods are relatively expensive and the results can be subjective. This is particularly true for measurements of fluid yield stress, which are notoriously difficult to obtain. Marsh Funnels are popular quality-control tools used in the field for drilling fluids and they offer a simple, practical alternative to viscosity measurement. In the normal measurements, a single point (drainage time) is used to determine an average viscosity; little additional information is extracted regarding the non-Newtonian behavior of the fluid. Here, a new model is developed and used to determine the rheological properties of drilling muds and other non-Newtonian fluids using data of fluid volume collected from a Marsh Funnel as a function of time. The funnel results for viscosity and shear-thinning index compare favorably to the values obtained from a commonly-used Fann 35 viscometer. More importantly, an objective, static method for determining yield stress is introduced, which has several advantages over dynamic, extrapolation techniques used for rheometer data.
581			_a3-4
773	0		_tJournal of Petroleum Science & Engineering _g77
942			_cARTICULO
100	1		_aBalhoff, Matthew T. _951780
100	1		_aLake, Larry W. _95511
100	1		_aBommer, Paul M. _951781
999			_c185927 _d185927