A Tracer Injection-Test Approach to Reservoir Characterization: Theory and Practice

Samaniego, Fernando; Pulido, Héctor; Rivera, Jesús; Velazquez, Rodolfo Camacho; Olave, Victor Hugo Perez; Martínez, B.

doi:10.2523/iptc-11038-ms

Cited by 4 publications

(1 citation statement)

References 1 publication

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“…The tracer assessment provides the variation of the flooding streamline within the heterogeneity formation. This pathline is geologically indistinguishable or opposite under the natural fracturing, fracture systems, fault frontier, great permeability vein, high permeability thief zones, or stream-blockade (Samaniego et al, 2005). Various types of tracer fluid have been added into the injection influx to monitor the streamline as a fluid carrier (Du & Guan, 2005).…”

Section: Introductionmentioning

confidence: 99%

Benefits of the Tracers Test Technique in Improving the Performance of Group Wells

Putra

Umar²,

Futur³

et al. 2021

J. earth energy eng.

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This study aims to determine the benefits of the interwell tracer test technique in improving the streamline simulation on the existing array's re-look. It also analyses the best scheme for the injection spot to enhance oil recovery. This study's subject parameters are limited to the tracer's breakthrough time, produced concentration, cumulative production, and pathline movement. The results showed that previous studies distinguished the correlation between injectors and producers with the development of a new pathline that conveys a scheme of water-flood for the application. Furthermore, several developments of water-flood schemes have been executed for better oil recovery in the mature fields worldwide. The vigorous simulation model is an effort to imitate the actual field capable of enhancing the character's understanding and helping the waterflood to rinse the oil trap or the unswept pocket. Unlike a Cartesian model, the streamline conveys an enhanced portrait of the transmissibility reservoir in terms of pressure-driven. The streamline model suggests the injector's preferred position to unlock any unswept oil in the formation and minimize the water path conflict, which leads to over injection in some regions. The expected outcome is the ultimate oil increment with the original technique associated with re-patterning the wells appropriately to gain residual oil saturation in the virgin alleyway.

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Section: Introductionmentioning

confidence: 99%

Benefits of the Tracers Test Technique in Improving the Performance of Group Wells

Putra

Umar²,

Futur³

et al. 2021

J. earth energy eng.

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show abstract

Solution of the inverse problem of tracer tests interpretation results for oil reservoirs in the presence of low resistance channels

Fedorov,

Gilmanov,

Shevelyov

et al. 2024

Vestnik of Samara University. Natural Science Series

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Tracer tests of oil reservoirs have become widely used to assess the parameters of low resistance channels, leading to premature increasing of production water cut. The existing analytical methods of their interpretation do not consider the dissipation of the tracer. The article proposes a methodology of tracer tests interpretation in the presence of low resistance channels, which considers the configuration of the tracer slug in the producer. The developed method is based on solving the inverse problem of tracer filtration in the low resistance channel and for the first time considers its dissipation. The formulation of the inverse problem of tracer filtration in the low resistance channel is based on the use of the tracer transfer equation in the channel, the ratio for the reagent flow in the channel and the reservoir, Darcy’s law and the relationship of the volume of the tracer slug with its linear size. The algorithm of numerical determination of the tracer dissipation coefficient by solving the optimization problem by the gradient descent is given. The developed algorithm has been tested on the example of the tracer tests interpretation for two producers of one of the Western Siberia fields. The lengths of each channel for the selected wells are determined. It is shown that the error of comparison of calculated and field data does not exceed 7%. It was found that the length of the shortest channel corresponds to the distance between injector and producer, other channels have a longer length and can be formed later.

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Analytical and Numerical Modeling of Tracer Flow in Oil Reservoirs Containing High Permeability Streaks

Kocabaş

Maier²

2013

SPE Middle East Oil and Gas Show and Conference

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Tracer testing is a powerful tool for reservoir description and evaluation at every stage of the productive life of a reservoir. In this work, we present an analytical and numerical model for the transport of tracer in oil reservoirs containing a high permeability streak. The new analytical model is aimed to aid in the interpretation of tracer tests, provide a better insight into the mechanisms of tracer/EOR fluids transport, understand the role of input parameters, and provide a useful benchmark for numerical simulators. The model is validated by a numerical simulator COMSOL Multiphysics 4.3 which employs finite element technique in its ‘Subsurface Flow" module. The new analytical model is distinguished with its ability to account for finite longitudinal and transversal tracer dispersions in the high permeability streak and the tracer loss into the bounding low permeability layers. Thus, being possibly the most comprehensive exact analytical unsteady two dimensional tracer transport model, it exhibits the roles of both boundary conditions and fluid mechanics controls simultaneously. Intuitively, one would expect that the coupled one dimensional analytical solutions may be appropriate for the systems with a large aspect ratio defined as the ratio of the length of high permeability zone to its half-width. In this work, however, we demonstrate that the parameter which controls the applicability of one dimensional models is the square root of ratio of the two characteristic times of longitudinal and transverse dispersion. While we have validated the analytical solution with a finite element simulator, the analytical solution in turn provided an advanced benchmark free of numerical dispersion and unphysical oscillations in two-dimensional domains for numerical models. The nonlinear regression programs coded in MATLAB are employed to interpret the tracer return profiles, and hence, to be able to estimate the models parameters along with related confidence intervals.

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A Tracer Injection-Test Approach to Reservoir Characterization: Theory and Practice

Cited by 4 publications

References 1 publication

Benefits of the Tracers Test Technique in Improving the Performance of Group Wells

Benefits of the Tracers Test Technique in Improving the Performance of Group Wells

Solution of the inverse problem of tracer tests interpretation results for oil reservoirs in the presence of low resistance channels

Analytical and Numerical Modeling of Tracer Flow in Oil Reservoirs Containing High Permeability Streaks

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