Method and device for determining history matching adjustment parameters in reservoir numerical simulation

Abstract

The invention provides a method and device for determining history matching adjustment parameters in numerical simulation of oil reservoirs. The method includes: determining oil production, water production and water injection of connected well layers according to reservoir data in numerical simulation of oil reservoirs The functional relationship between the target oil wells, the water production rate and the water injection rate of the connected well layer are analyzed by multiple linear regression to determine the multiple linear regression between the oil production rate of the target oil well and the water injection rate of the connected well layer formula; determine the historical fitting parameters of the target oil well to be adjusted according to the regression coefficient of the multiple linear regression formula of the determined oil production rate of the target oil well and the water injection rate of the connected well layer. The present invention adopts the method of multivariate statistics, and establishes the relationship between the water absorption of each layer of the water injection well calculated by simulation and the production of the production well, and by analyzing the influence of each water absorption layer on the production of the oil well, the adjustment layer is judged, and the adjustment and modification are correspondingly small. The parameters of the layer guide the history fitting and achieve the purpose of fine history fitting.

Description

technical field [0001] The invention relates to oil reservoir exploration technology, in particular to a method and device for determining history matching adjustment parameters in oil reservoir numerical simulation. Background technique [0002] After years of exploitation, my country's developed oilfields have generally entered the stage of high water cut and high recovery degree, the oil-water distribution relationship has become very complicated, and the remaining oil is "highly dispersed and relatively enriched". The task of reservoir numerical simulation is determined by the development plan The macro-decision-making turned to study the distribution of remaining oil in old oilfields with high water cut, and search for the relatively enriched parts of remaining oil. my country's multi-layer sandstone reservoirs have the characteristics of long oil-bearing well intervals, many small layers and large interlayer differences. Therefore, the very prominent interlayer differen...

AI Technical Summary

Problems solved by technology

On the one hand, the automatic history matching technology itself requires very complex calculation methods and is extremely difficult. On the other hand, the various types of oil and gas reservoirs that people face are very different, and the main influencing factors are different. The fitted variables also need to be adjusted continuously as the understanding deepens during the simulation process

Although many scholars have made a lot of attempts in this area since the 1970s, they have not been well resolved in terms of theoretical methods and are still in the stage of discussion.

At present, reservoir engineers mainly rely on their knowledge and experience in geology and reservoir engineering to find and adjust the fitting variables by using the “trial and error method” to reduce the fitting error until the fitting accuracy is met. The biggest disadvantage of the "trial and error method" is the dependence on "experience". Different people will get different fitting results, and the fitting results are very uncertain.

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