Determination method for injection allocation volume of separated layer water injection layer sections

Abstract

The invention belongs to the technical field of oil-gas field development, and particularly relates to a determination method for the injection allocation volume of separated layer water injection layer sections. The injection allocation volume of the separated layer water injection layer sections is determined according to the relation among the recovery percentage, the water storage rate and the water content rate by applying a traditional oil reservoir engineering method. The determination method comprises the following steps that liquid physical property data, the separated layer water injection layer section dividing combination and dividing layer section number and water injection production history data of an oil reservoir are collected and counted; the total water injection volume needed when the water content rate of all the separated layer water injection layer sections reaches 98% is calculated; the accumulated insufficient water injection volume of all the separated layer water injection layer sections is obtained through calculation by subtracting the accumulated water injection volume from the total water injection volume needed when the water content rate of all the separated layer water injection layer sections reaches 98%; the injection allocation volume of all the separated layer water injection layer sections is determined. According to the determination method, a reasonable layer section injection allocation volume scheme can be quickly determined to determine the injection allocation volume of the separated layer water injection layer sections, and the problems that a small amount of oil-water well layered testing data exists, and the injection allocation volume of the separated layer water injection layer sections is difficult to determine can be solved.

Description

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AI Technical Summary

Benefits of technology

This technology allows us to accurately predict how much time it takes from injecting fluid into different areas within an underground formation or seawater aquifer when there may be insufficient testing during drilling operations due to factors like poor hydraulic conductivity near certain parts of the subterranean formations.

Problems solved by technology

In this patented technical problem addressed by the inventor describes how optimizing the placements of multiple layers within a single zone during water injection developments has been challenging because there are numerous variables involved such as interlayer interaction, injectivity, etc., which makes accurate calculations necessary even when only limited data from previous drilling campaigns may provide useful insights into future performance issues.

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