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

Abstract

The invention provides a method and a device for determining history matching adjustment parameters in numerical reservoir simulation. The method comprises the following steps of determining a function relation of oil production and water yield of an oil well and a water injection rate of a connected well layer according to reservoir data in the numerical reservoir simulation; carrying out multiple linear regression analysis on the function relation of the oil production and the water yield of the target oil well and the water injection rate of the connected well layer, and determining a multiple linear regression formula of the oil production of the target oil well and the water injection rate of the connected well layer; and determining the to-be-adjusted history matching parameters of the target oil well according to regression coefficients of the determined multiple linear regression formula of the oil production of the target oil well and the water injection rate of the connected well layer. By adopting a method of multivariate statistics, relation is established between the water absorbing capacity of each layer of a water injection well and the yield of a production well, which are obtained through analog computation, and through analyzing the influence of each water absorbing layer on the yield of the oil well, the layer position is judged and adjusted, the parameters of the corresponding small layer are adjusted and modified, and the history matching is guided, so that the purpose of detailed history matching is achieved.

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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