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Portable high temperature, high pressure viscometer [electronic resource].

Published
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1978.
Physical Description
Pages: 15 : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A field instrument for measuring the rheological characteristics of drilling mud at simulated downhole conditions was developed. The instrument can provide viscosity measurement to 300 centipoise at temperatures up to 500/sup 0/F, pressures up to 12,500 psi, and shear rates up to 1000 Hz. The design of the system is described, and the results of some preliminary tests on water-based and oil-based drilling muds are given. The design consists of a rotational viscometer packaged inside a heated pressure vessel. The fluid sample is placed inside a test cell, and the desired temperatures and pressure conditions are then selected. A direct readout of viscosity is provided. Four samples of water-based muds were tested: a bentonite mud, a bentonite mud with FCL thinner, a bentonite based mud with FCL and lignite thinners, and a mud developed by Maurer Engineering for geothermal use. Tests on these muds indicate that the addition of thinners is effective in increasing the usable temperature range of the bentonite mud from approximately 125/sup 0/C to 200/sup 0/C. Pressure effects on water-based muds were found to be insignificant. Oil-based muds exhibited thinning characteristics with increasing temperature and a marked increase in viscosity with increased pressure. Therefore, during drilling, the borehole pressure tends to compensate for the thinning effect of borehole temperature. Curves showing this quantitative dependence of viscosity on temperature and pressure are presented.
Report Numbers
E 1.99:sand-78-1064c
E 1.99: conf-780580-2
conf-780580-2
sand-78-1064c
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1978.
"sand-78-1064c"
" conf-780580-2"
Workshop on geothermal drilling fluids, Houston, TX, USA, 23 May 1978.
Varnado, S.G.; Reineke, R.C.
Sandia Labs., Albuquerque, NM (USA)
Funding Information
EY-76-C-04-0789
View MARC record | catkey: 14387416