A method and device for determining the water content of a water drive reservoir

Abstract

The embodiment of the application discloses a method and a device of determining water contents of a water-drive oil reservoir. The method includes: carrying out linear regression fitting on a plurality of data points with specified parameter as ordinates and recovery percent as abscissas to obtain a linear relationship curve diagram of the specified parameter and the recovery percent; determiningan ultimate recovery factor of the objective oil reservoir according to the linear relationship curve diagram; determining a water-drive characteristic curve type corresponding to historical production data, and determining an association relationship of recovery percent and the water contents of the objective oil reservoir according to the water-drive characteristic curve type; determining a historical initial value of the recovery percent and a historical initial value of the water contents of the objective oil reservoir; and determining the water contents under the different recovery percent of the objective oil reservoir according to the historical initial value of the recovery percent, the historical initial value of the water contents and the association relationship of the recoverypercent and the water contents. The technical solution provided by the embodiment of the application can relatively accurately determine the water contents of the water-drive oil reservoir.

Description

technical field [0001] The present application relates to the technical field of oilfield development, in particular to a method and device for determining the water content of a water drive reservoir. Background technique [0002] Through the research on the water drive curve and the statistics of the actual production data of the oil field, it is proved that there is a certain relationship between the water cut and the recovery degree of any water drive reservoir. Comprehensive reflection of flow law, using the relationship between water cut and recovery degree can determine the change of water cut with recovery degree. This relationship depends not only on reservoir parameters such as heterogeneity of reservoir, fluid properties, water body size and fluid distribution, but also on human factors such as development well pattern, production method and working system. In actual oilfields, the parameters of each reservoir vary greatly, and the development well patterns and p...

AI Technical Summary

Problems solved by technology

However, the formula does not have any theoretical derivation, it is just an assumption, and the constant a has no physical meaning

[0009] There are two main problems in the existing water cut and recovery degree relationship curve diagrams. One is that the Tong’s diagram obtained based on statistical laws 30 years ago cannot be well applied to the current water flooding reservoirs. The predicted Moisture content is often much different than the actual one, which has certain limitations; second, the revised chart formula only artificially modifies the coefficient 7.5 in Tong's chart formula to other constants, which lacks scientific nature

Images