Establishment method of inter-well connection relationship in oil reservoir

Abstract

The invention discloses a method for establishing a connection relationship between wells in an oil reservoir, which includes: the step of dividing the connection unit, dividing the connection area between the wells in the oil reservoir into a plurality of connection units, and making the connection area between every two well points correspond to Based on a connected unit, and the characteristic parameters of each connected unit include average conductivity and pore volume; the calculation step of single well water content calculates the single well water content of each well point according to the average conductivity and pore volume of each connected unit; The production dynamic index calculation step is to calculate the production dynamic index according to the single well water content of each well point; the parameter correction step is to respectively fit the calculated production dynamic index of each well point with its actual production dynamic index to The average conductivity and pore volume of each connected unit are corrected. The invention can reflect the interaction between various wells, taking into account the situations of well shutdown and oil well transfer injection, etc., as well as the actual geological characteristics of the entire oil reservoir.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method for establishing the connection relationship between oil reservoir wells. Background technique [0002] Fracture-vuggy reservoirs have the characteristics of strong random distribution of storage space and serious reservoir heterogeneity, and their fluid flow characteristics and oil-water flow rules are more complicated than those of conventional sandstone reservoirs. Performance evaluation has always been the difficulty and focus of oilfield development performance analysis and reservoir description. [0003] How to obtain the connection relationship between wells in this type of reservoir plays an important role in understanding the geological characteristics of the reservoir and the distribution of remaining oil, guiding the optimization of injection-production policies in the later stage, the adjustment of measures such as water plugging and profile contr...

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Problems solved by technology

However, the existing models generally have the following problems: (1) The model parameters have no clear geological meaning, and can only reflect the relative connectivity between wells, but cannot reflect the real geological characteristics between wells; (2) Only the relationship between injection and production wells is considered. The interaction between production wells is not considered, and the model itself cannot consider the situation of shutting down wells and oil well transfer, so the inversion results are greatly affected by the adjustment of reservoir measures, and the reliability is poor; (3) The inversion of model parameters In the process of drilling, the injection-production rate is mainly used, without combining dynamic indicators such as water cut and pressure, it is difficult to accurately reflect the actual production status of the oil well and the geological characteristics of the reservoir.

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