A Method for Determining the Amount of Effective Polymer Used in Oil Production Wells

Abstract

A method for determining the amount of effective polymer in an oil production well, comprising the following steps: establishing a formula for static vertical and plane splitting coefficients of a polymer injection well; using the injection rate, static vertical splitting coefficient and plane splitting coefficient of a polymer injection well Calculate the effective injection volume split to the surrounding connected oil production wells; accumulate the effective injection volume split by the polymer injection wells connected to it with the oil production well as the center; calculate the difference between the actual liquid production volume and the effective injection volume ;Set the threshold of this difference, find oil production wells smaller than the threshold according to the greedy algorithm and fix the split coefficient of the polymer injection well connected to it, and then search for the existence of a fixed number of connected split values ​​and connected polymer injection wells according to the difference from small to large. If there is a production well with a difference of 1 in the number of wells, the splitting coefficient is corrected according to the difference between the actual liquid production volume and the effective injection volume until there is no correctable splitting coefficient; Optimize the coefficient; calculate the effective polymer dosage of the production well according to the split coefficient.

Description

Technical field: [0001] The invention relates to a method for splitting the amount of polymer injected from a polymer injection well into a connected oil production well during the polymer injection flooding process in the five-point well pattern of the oil field. Background technique: [0002] Polymer flooding technology is one of the most widely developed tertiary oil recovery technologies in my country. Injecting polymers can improve the mobility ratio, increase the swept volume of injected water, and improve the development effect of homogeneous oilfields. After more than ten years of industrialized production of polymer flooding, a set of practical analysis and evaluation methods for the development effect of polymer flooding blocks have been gradually formed. However, with the continuous increase of industrialized blocks, the reservoir conditions and well pattern Well spacing and injection parameters vary greatly, and it is difficult to integrate unified polymer inject...

AI Technical Summary

Problems solved by technology

However, after years of injection-production development in the oil field, the lithology, physical properties, and various dynamic and static parameters describing the properties of the oil reservoir have changed. Numerical simulation methods based on laboratory physical simulation experiments or expert experience combined with relevant professional knowledge involve many Many parameters are difficult to determine and accurate, and only approximate or estimated values ​​can be used. Therefore, there is a certain deviation between the predicted results and the actual production data, and the universality is not strong.

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