A method for predicting the development index of pulsed periodic water flooding in multi-layer reservoir

Abstract

A method for predicting the development index of pulsed periodic water flooding in multi-layer reservoir is based on mathematical analysis and optimization theory, synthesizes the static reservoir factor and dynamic development factor, fully refers to and applies coring, secondary interpretation, exist monitoring data, etc. to establish a split calculation method and reasonable injection distribution and injection allocation models. The sub-injection and injection allocation models are respectively formed into software, which can transfer the relevant data from the production database of the research block. The injection allocation quantity of each well and each layer in the block is automatically calculated by the injection allocation model. Through the calculation of separate injection model, the separate injection intervals of water injection wells are automatically given. The invention divides data display, service processing and data storage into different layers. The method maintains the relative independence between the layers, and is especially suitable for the development of large-scale systems. Once the user business rules change, the system has good adaptability, and theworkload of later revision and maintenance is small.

Description

technical field [0001] The invention relates to the technical field of oil-water well development, in particular to a method for predicting development indexes of multi-layer oil reservoirs by pulse periodic water injection. Background technique [0002] Mature oilfields have entered the late stage of development, with complex oil-water distribution and prominent water flooding contradictions. Horizontal and vertical heterogeneity and intricate large pores restrict the expansion of the swept volume, resulting in serious ineffective water circulation and increasing difficulty in tapping potential. At present, the old oil and water wells have the following problems: [0003] (1) The prediction of development index of water drive reservoir is an important basis for reservoir injection-production adjustment and well pattern optimization. Scholars at home and abroad have successively proposed prediction methods for water flooding reservoir development indicators, and they have b...

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Problems solved by technology

Because this method ignores the plane heterogeneity of the reservoir and the development characteristics of the injection-production well group, the predicted production index deviates greatly from the actual production index

[0004] (2) Domestic oil fields such as Xifeng Oilfield and Maling Oilfield are greatly affected by water sensitivity, which leads to rapid rise of water injection pressure, rapid rise of oil well water content, and decline of oil well production, which affects the effect of water injection development and makes the water injection development process more difficult. complex

Since most of the established well logging interpretation models are linear models, the results obtained from well logging interpretation can only be well matched in a few simple formations, but the performance in complex areas is inconsistent with the real formation

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