Device and method for polymer flooding equilibrium displacement front monitoring experiment evaluation

Abstract

The invention discloses a polymer flooding equilibrium displacement front monitoring experiment evaluation device and method. The experimental evaluation device includes a closed cavity; the upper cover of the closed cavity is provided with a number of through holes for simulating the production well pattern, and each through hole represents a well position of the oil reservoir; the upper cover is arranged with several oil-containing The saturation monitoring electrode is embedded in the closed cavity. Compared with the existing methods, the monitoring method based on the polymer flooding balanced displacement front monitoring experiment and evaluation device of the present invention can consider the influence of the well pattern, injection ratio, and alternate injection mode on the balanced displacement of reservoir engineering. The impact of the effect, by inputting the resistivity measured in the experiment into the post-processing software based on the Archie formula to obtain the oil saturation of each monitoring point, and then substituting it into the calculation to obtain the Theil index value as an index for evaluating the equilibrium displacement degree of different displacement schemes , the smaller the Theil index, the more balanced the displacement.

Description

technical field [0001] The invention relates to a polymer flooding balanced displacement front monitoring experiment evaluation device and method, and belongs to the technical field of chemical flooding enhanced oil recovery. Background technique [0002] In order to improve the oil displacement effect of polymer flooding in heterogeneous offshore reservoirs, the balanced displacement of polymer flooding is to comprehensively use reservoir engineering and seepage mechanics methods to improve the effect of polymer flooding, generally through the adjustment of well pattern, well type and chemical injection method The degree of displacement equilibrium can be improved, but there is currently no ready-made index to evaluate the degree of polymer equilibrium displacement. Due to polymer diffusion and dispersion, the polymer flooding front of the visualization model is blurred, making real-time monitoring of the front very difficult; therefore, real-time reflection of the oil satu...

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Problems solved by technology

[0002] In order to improve the oil displacement effect of polymer flooding in heterogeneous offshore reservoirs, the balanced displacement of polymer flooding is to comprehensively use reservoir engineering and seepage mechanics methods to improve the effect of polymer flooding, generally through the adjustment of well pattern, well type and chemical injection method It can improve the degree of displacement equilibrium, but there is no ready-made index to evaluate the degree of polymer equilibrium displacement

Due to polymer diffusion and dispersion, the polymer flooding front of the visualization model is blurred, making real-time monitoring of the front very difficult; therefore, real-time reflection of the oil saturation profile and displacement front dynamics during the polymer flooding process It is of great significance to the sustainable and efficient development of polymer flooding, and it is urgent to propose a polymer flooding equilibrium flooding front monitoring experimental evaluation method and experimental equipment

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