A method and system for establishing a multi-layer reservoir interwell connectivity model

Abstract

The invention relates to a method and system for establishing a connectivity model between wells in a multi-layer oil reservoir, aiming at the limitations of the current connectivity model, which can only predict the dynamic change of liquid production, cannot separately calculate the dynamics of oil-water two-phase, and cannot perform connectivity analysis in layers. , to establish a multi-layer reservoir interwell connectivity model that can simulate oil-water dynamics. The model discretizes the stratification of the reservoir system into a series of connected units between wells, and calculates the material balance equation with the connected units between wells as the simulation object, realizes the pressure solution and the calculation of the flow rate between wells, and establishes the interwell saturation The oil and water production dynamics of each layer at the well point are obtained by using the degree tracking calculation method; the model parameter inversion method is established through dynamic fitting by using the random disturbance approximation method and the projected gradient method. It can obtain real-time information such as the flow distribution coefficient between layered wells, the vertical liquid production of a single well and the splitting coefficient of oil production, more accurately reflect the oil-water flow relationship and changes in production measures in the horizontal and vertical directions of the reservoir, and guide the actual production of the oilfield.

Description

technical field [0001] The invention relates to a method and system for establishing a connectivity model between wells in a multi-layer oil reservoir, and belongs to the technical field of oil and gas exploration. Background technique [0002] Water flooding development is the main development method of crude oil production in my country, and it is also the most mature, economical and effective extraction technology for oilfield development at present. Connectivity evaluation is the basis of reservoir water injection development design, and plays an important guiding role in optimizing the relationship between injection and production structures, analyzing the distribution law of remaining oil, and formulating measures such as infilling and profile control. Due to the complexity of the reservoir seepage system and the heterogeneity of the reservoir, coupled with the influence of long-term water injection on the physical properties of the reservoir and fluid, it is extremely...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a multi-phase model that can simulate oil-water dynamics in view of the limitations of current connectivity models that can only predict dynamic changes in fluid production, cannot separately calculate oil-water two-phase dynamics, and cannot perform connectivity analysis in layers. Method and system for establishing connectivity model between wells in layered reservoirs

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