New and simple methods of determination partition coefficient and degree hydrolysis of tracer for estimating residual oil saturation by SWCTT technologies

Galeev, Ranel I.; Bolotov, Alexander V.; Varfolomeev, Mikhail A.; Mukhutdinova, Alfiya R.; Smirnov, A.E.; Kornilov, A. V.; Kruglov, D.S.; Zhirov, A. V.; Sansiev, Georgy; Fedorchenko, Gennady

doi:10.1080/10916466.2021.1970181

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…The reservoir temperature determines the type of partitioning tracer utilized, which is a parameter that affects the degree of hydrolysis of the primary tracer. Formic acid esters hydrolyze 50-times faster than acetic acid esters and can be used at low reservoir temperatures in the range from 21 to 57 • C. Above this temperature, esters of acetic acid should be preferred, as they react more slowly and are mainly used in the temperature range from 54 to 121 • C [24,25].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Kinetic and Thermodynamic Behavior of Tracers for Their Applicability in SWCTT

Anikin

Bolotov²,

Mukhutdinova³

et al. 2022

Processes

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Determining residual oil saturation by the single-well chemical tracer test (SWCTT) is of key importance for assessing the potential of enhanced oil recovery (EOR) and developing EOR pilot projects. However, the test trials conducted since the first injections of tracer compositions until now have not resulted in a detailed analysis of the selection of candidates for single-well tracers and their limits of applicability in various reservoir conditions. The purpose of this study was to consider the influence of the structure on the kinetic and thermodynamic components of tracers to assess their application’s operating intervals. It is shown that the rate of single-phase and two-phase hydrolysis of the primary partitioning tracer makes it possible to predict the shut-in time by calculating when the tracer is injected at the reservoir temperature. The influence of the tracer structure during the extraction process with an increase in the hydrocarbon chain of the ester in a different range of brine salinity and temperature has been studied. As a result, this work provides a method for evaluating the thermodynamic and kinetic behavior of primary tracers to establish minimum and maximum threshold K-values at various values of residual oil saturation, temperature, and brine salinity, taking into account the optimal time of the well shut-in to carry out at least 1/2 hydrolysis of esters.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Kinetic and Thermodynamic Behavior of Tracers for Their Applicability in SWCTT

Anikin

Bolotov²,

Mukhutdinova³

et al. 2022

Processes

Self Cite

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Algorithm for estimating boundary conditions of a distributed tracer for application in a single-well tracer test

et al. 2022

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An important tool in determining residual oil saturation today is the single-well tracer test, as the preferred method for assessing the potential for using enhanced oil recovery methods (EOR) and developing pilot projects. The success of the test performed directly depends on the optimal choice of the tracer composition, which will contribute to the qualitative determination of the parameters required in the calculation of the residual oil saturation of the formation. To assess the boundary conditions for the applicability of the tracer in the field, the kinetic and thermodynamic properties of tracers are considered under various reservoir conditions of the field. Based on the results of this work, an algorithm for assessing the applicability of the tracer for reservoirs in a wide range of salinity and temperatures is presented.

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Reservoir Adaptability Evaluation and Application Technology of Carbon Quantum Dot Fluorescent Tracer

Chen

Liu

Dai

et al. 2023

Eng

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This study investigates the application of carbon quantum dots as tracers in inter-well connectivity monitoring. A new laboratory-made water-soluble carbon quantum dot fluorescent tracer (CQD-W) was studied using 3D fluorescence characterization, structural characterization, reservoir suitability evaluation, and core flow experiments. The experimental results showed that CQD-W has a size of about 2 nm, a minimum detection limit of 10−2 mg·L−1. It has good stability when the salinity is 200,000 mg·L−1, the concentration of Ca2+ is 1000 mg·L−1, the pH value is 1–9, and the temperature is 80 °C. Because CQD-W contains many functional groups, such as carboxyl and hydroxyl, it shows good water solubility and has a negative surface charge. In the process of formation flow, CQD-W has a small adsorption amount, high tracer resolution, and excellent injectivity and mobility, meaning it is less likely to cause reservoir damage. Through the study of this method, the application field of carbon quantum dots is broadened, and it is proved that the CQD-W fluorescent tracer has a high potential for application in the oil industry, laying the foundation for the popularization of this technology.

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New and simple methods of determination partition coefficient and degree hydrolysis of tracer for estimating residual oil saturation by SWCTT technologies

Cited by 3 publications

References 11 publications

Evaluation of the Kinetic and Thermodynamic Behavior of Tracers for Their Applicability in SWCTT

Evaluation of the Kinetic and Thermodynamic Behavior of Tracers for Their Applicability in SWCTT

Algorithm for estimating boundary conditions of a distributed tracer for application in a single-well tracer test

Reservoir Adaptability Evaluation and Application Technology of Carbon Quantum Dot Fluorescent Tracer

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