STUDY OF TEMPERATURE AND FLOW RATE INFLUENCE ON THE VISCOSITY OF OIL EMULSIONS

Relevance. Due to the wide variation in the values of temperatures and water-cut of the produced paraffinic oil, it is necessary to have some initial data, including the oil viscosity, to establish the technological modes of well operation. In relation to a significant increase in the water cut of v...

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Bibliographic Details
Published in:	Izvestiâ Tomskogo politehničeskogo universiteta. Inžiniring georesursov Vol. 332; no. 10; pp. 69 - 76
Main Authors:	Ildar Sh. Mingulov, Marat D. Valeev, Vyacheslav V. Mukhametshin, Shamil G. Mingulov, Lyubov S. Kuleshova
Format:	Journal Article
Language:	Russian
Published:	Tomsk Polytechnic University 01-10-2021
Subjects:	flow rate gradient non-newtonian oil properties oil emulsions rheology viscoplastic properties
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Summary:	Relevance. Due to the wide variation in the values of temperatures and water-cut of the produced paraffinic oil, it is necessary to have some initial data, including the oil viscosity, to establish the technological modes of well operation. In relation to a significant increase in the water cut of viscous paraffinic oil fields production the study of these parameters influence on rheological properties of the produced product for profitability of field development increasing is highly relevant. Objective: to study the temperature, water cut, and flow rate influence on the viscosity characteristics of oil-water emulsions. Objects: artificial water-oil emulsions of the Kiengop oil field, made from natural samples. Methods. The study of the rheological characteristics of water-in-oil emulsions was carried out in laboratory conditions using a rotary viscometer «Rootest-2». Results. The authors have obtained the dependence of the effective viscosity of inverse emulsions on the oil water cut in the Kiengop oil field, depicting its exponential nature in the range of water content of 0–69 %. A further increase in water cut leads to a sharp multiple decrease in the viscosity value due to the phase inversion in the emulsion. The authors established the boundaries of the Newtonian properties of water-oil emulsions transition into non-Newtonian (viscoplastic) ones by the content of the internal water phase and the temperature effect of the medium on the transient process. It was found that the change in the viscosity of dry crude oil in the temperature range of 7–20 °С occurs in the entire range of changes in the angular rotation velocity of the measuring cylinder, and the lower the speed, the greater the limit of the change in viscosity. With the increase in the water content in the test medium, the upper limit of the temperature range, in which the viscosity of the emulsion is not constant, increases. The decrease in oil-water emulsion flow rate in the field equipment (wells and pipelines) leads to increase in effective viscosity, all other things being equal, which must be taken into account when designing technological processes in oil production.
ISSN:	2500-1019 2413-1830
DOI:	10.18799/24131830/2021/10/3029