The cyclic steam stimulation of the bottom-hole zone of the reservoir is actively used for the production of heavy oil. However the use of the technology is associated with a number of problems, in particular, with the high water cut of production and a drop in the steam quality when the heat transfer fluid moves along the borehole due to heat losses. To prevent these problems, it is necessary to conduct special geophysical studies, among which short-term dynamic temperature studies are distinguished as promising. Classical methods that perform point-by-point temperature measurement along the borehole diagnose temperature anomalies but do not reveal their nature. The existing mathematical models do not contain the necessary optimization criteria for the most effective use of cyclic steam stimulation. Therefore, the purpose of the work is to create a methodology for express assessment of optimal technological parameters of the cyclic steam stimulation of the oil reservoir using data from the short-term dynamic temperature studies. A method for calculating the efficiency of cyclic steam stimulation is proposed in the article for the first time, based on direct measurements of the temperature distribution along the borehole (short-term dynamic temperature studies). The developed technique is based on solving the problem of the movement of the heat transfer fluid along the borehole (internal and external problems) and on solving the problem of the propagation of the thermal field in the productive interval of the formation. The classical system of equations of mechanics of multiphase systems is used to solve the internal problem, with the temperature distribution obtained by the short-term dynamic temperature studies. The solution of the problem of the propagation of the thermal field in the productive interval of the reservoir using an integral approach and the heat balance equation allows establishing the presence of optimal time for injection of steam, steam soaking and the stage of oil production. The specified time is calculated for well N of the Usinskoye field. It is shown that the optimization of the process of cyclic steam stimulation allows increasing the additional cumulative oil production by 28 %.
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