![]() ![]() Doherty were correct in every particular, as will be seen from thediscussion of the subject and the data contained in this paper. The results ofthe experimental work carried on have proved that the claim and contention ofMr. Doherty's direction and experiments were carriedon to determine definitely the viscosity and the surface tension of the crudeoils which contain dissolved gases under different pressures. This resistance is a result of friction between the liquid undergoing deformation under shear stress and the solids and liquids present in the drilling mud. All parties consultedagreed that the viscosity of the oil would be affected by gas dissolved thereinto the extent that natural gasoline was present in the gas, but so far as couldbe determined any additional effect of the natural gas was unknown.Īccordingly, it was necessary to devise equipment and carry on experimentswhich would either prove or disprove Mr. It is the single most critical physical property of the oil as it affects both the wear. Doherty's claim and contention that oil in an undisturbed pool wasdifferent in character and behavior than the same oil when raised to thesurface of the earth, and that the gas dissolved in the oil caused a markedreduction in its. Viscosity, by definition, is an oils resistance to flow and shear. Dohertyin an endeavor to obtain an increased yield of oil from oil-bearing sands, itwas Mr. Doherty's claim was either right or wrong. In the course of the experimental and development work of Henry L. So faras could be ascertained no experimental work had been carried on to indicatethat Mr. Therefore, the viscosity of gases may be estimated with an accuracy sufficient for most engineering calculations, e.g. For a fluid in motion, the viscosity describes the. Prior to 1924 no information tosupport this contention could be found in the literature or by a discussion ofthe subject with technical men in Government and private laboratories. Viscosity is defined as the measure of a fluids resistance to fluid flow under an applied force. Although variously defined, the upper limit for heavy oil is 22 API gravity with a viscosity of 100 cp (centipoise). Tracking viscosity is important when it comes to understanding conditions deep underground. Doherty's claim and contention that oil in an undisturbed pool wasdifferent in character and behavior than the same oil when raised to thesurface of the earth, and that the gas dissolved in the oil caused a markedreduction in its viscosity and surface tension. Viscosity Measurement in Oil and Gas Applications. For liquids, it corresponds to the informal concept of thickness. In the course of the experimental and development work of Henry L. The viscosity of a fluid is a measure of its resistance to deformation at a given rate.
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