A Theoretical Analysis of Profile Conformance Improvement Due to Suspension Injection

Konstantin Mikhailovich Fedorov,Alexander Yanovich Gilmanov,Alexander Vyacheslavovich Kobyashev,Denis Alekseevich Anuriev,Alexander Pavlovich Shevelev

doi:10.3390/math9151727

Konstantin Mikhailovich Fedorov, Alexander Yanovich Gilmanov + Show 3 more

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https://doi.org/10.3390/math9151727

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Abstract

This study is focused on a solution for the problem of suspension penetration in a porous formation. Such a solution forms the basis of injection profile diversion technology for oil reservoir sweep improvement. A conventional model of deep-bed suspension flow was used to describe the suspension injection process. The suspension slug was followed by water injection, and the inflow injection profile before and after treatment was investigated. For the first time, the criteria that determine the effectiveness of the inflow profile improvement process are introduced. The effect of the suspension filtration coefficient on the particle penetration depth was studied. A specific filtration coefficient value for the maximum penetration depth was achieved. The obtained analytical solution was generalized on multi-reservoir strata with poor interlayer crosslinking. The efficiency of profile conformance improvement was described by the differences in the root-mean-square deviations of the inflow velocities in interlayers from mean values before and after the treatment. It was shown that the complex criterion of suspension treatment efficiency should include a reduction in total injectivity. An increase in suspension slug volume improves the injectivity profile but decreases the total injectivity of an injector.

Highlights

Secondary recovery, i.e., waterflooding, along with an increase in recovery efficiency, leads to early water breakthrough into producing oil wells
The goal of common treatments for water control with respect to injection is confinement profile improvement or redistribution of the injection profile, increasing flow rates in low permeable interlayers and decreasing flow rates in high permeable streaks, and reducing water cut in the nearest production wells [1]
We present an analysis of the mechanisms of water inflow redistribution in a productive reservoir interval because of suspension slug injection, particle entrapment, and a reduction in the injectivity of layers

Summary

Introduction

I.e., waterflooding, along with an increase in recovery efficiency, leads to early water breakthrough into producing oil wells. A common reason for early water breakthrough is the reservoir layered heterogeneity. Wells with high water cut must be shut-in or recompleted to other reservoirs within the field. Reducing the water cut in produced fluid extends the development of a reservoir and increases the oil recovery factor (RF). The goal of common treatments for water control with respect to injection is confinement profile improvement or redistribution of the injection profile, increasing flow rates in low permeable interlayers and decreasing flow rates in high permeable streaks, and reducing water cut in the nearest production wells [1]. Oil production increases if the liquid production rate is maintained the same level as before the treatment

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