Method and system for establishing multilayer oil pool inter-well connectivity model

Abstract

The invention relates to a method and system for establishing a multilayer oil pool inter-well connectivity model. The multilayer oil pool inter-well connectivity model capable of simulating oil and water dynamic states is established oriented to the limitation that by means of a current connectivity model, only the dynamic change of production liquid can be predicted, the dynamic states of the oil phase and the water phase cannot be calculated respectively, and connectivity analysis cannot be carried out layer by layer. According to the model, an oil pool system is layered and scattered into a series of inter-well communication units, matter balance equation calculation is carried out with the inter-well communication units as simulating objects, pressure solving and inter-well flow calculation are achieved, an inter-well saturation degree tracking calculating method is established with the combination of the lead edge boosting theory, and the output dynamic states of oil and water of all layers at well points are obtained; a model parameter inversion method is established in a fitting mode through dynamic states based on a random disturbance approximation method, a projection gradient method and the like. Layered inter-well flow distribution coefficients, single well longitudinal production liquid and production oil splitting coefficients and other information can be obtained in real time, the oil pool plane, the longitudinal oil and water flow relation and the production measure change can be more accurately reflected to guide the practical production of an oil field.

Description

Technical field [0001] The invention relates to a method and system for establishing inter-well connectivity models of multi-layer oil reservoirs, and belongs to the technical field of oil and gas exploration. Background technique [0002] Water drive development is the main development method of crude oil production in my country, and it is also the most mature and economical and effective mining technology for oilfield development. 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 remaining oil distribution, and formulating infill profile control measures. Due to the complexity of the reservoir seepage system and the heterogeneity of the reservoir, plus the impact of long-term water injection on the reservoir and fluid physical properties, it is extremely difficult to accurately invert and characterize the connectivity rel...

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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