Oil reservoir condition-based optimal steam flooding scheme design method

Abstract

The invention discloses an oil reservoir condition-based optimal steam flooding scheme design method, and relates to theoretical analysis and calculation methods for the optimal design of the steam flooding schemes. The design method comprises the following steps of (a) combining the production practical data of a steam flooding oil reservoir to analyze and determine the single-well liquid production ability and injection ability, so as to judge the applicability and available well pattern forms of the oil reservoir; and (b) completing steam flooding development effect prediction and evaluation at the same time through optimizing the calculated data and determining the optimum operation condition parameters of steam flooding. The design method has the following beneficial effects of enabling the influence factors of four optimum operation condition parameters of the steam flooding to be mutually associated and apply comprehensive influences on the steam flooding effect via a multi-element factor coupling manner so that the obtained parameters accord with the practical thermal production, comprehensively considering the influence factors of the four optimum operation condition parameters so as to optimize the globality of the parameters, being applied to the optimization of the operation condition parameters of the steam flooding so as to make the obtained result clear in physical significance, and being simple in operation method so as to decrease the computer time and labor cost.

Description

Technical field: [0001] The invention relates to a steam flooding scheme optimization design method, in particular to a simple and practical steam flooding scheme optimization design theoretical method based on reservoir conditions. Background technique: [0002] Theoretical research and field production practice of heavy oil steam flooding have proved that under certain technical conditions, for a heavy oil reservoir that has been screened and is suitable for steam flooding, the highest economic recovery rate that can be achieved by steam flooding depends on the conditions of the reservoir itself. Whether or not the expected development effect can be obtained in the implementation depends on the operating conditions of the development scheme design (see works such as Yue Qingshan: "Steam Injection Development Technology for Heavy Oil Reservoirs", Beijing: Petroleum Industry Press, 1998, pages 71-78 ), both are equally important. In order to achieve successful steam floodin...

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Problems solved by technology

However, Yue Qingshan et al. considered the reservoir pressure as an independent variable, and did not conduct systematic basic research on the functional relationship between the reservoir pressure, the steam temperature in the reservoir steam chamber, and the latent heat of vaporization. The parameters of steam injection rate, steam dryness, and reservoir pressure are not determined strictly according to the coupling of reservoir parameters. Therefore, the theoretical basis for the optimal scheme design method of steam flooding needs to be strengthened

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