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Comparative Analysis of Methods for Determining the Wax Crystallization Onset Temperature of High-Paraffin Crude Oil from the Uzen Field.

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Title: Comparative Analysis of Methods for Determining the Wax Crystallization Onset Temperature of High-Paraffin Crude Oil from the Uzen Field.
Authors: Bayamirova, Ryskol1 (AUTHOR), Togasheva, Aliya1,2 (AUTHOR), Saduakassov, Danabek1,3 (AUTHOR), Zholbasarova, Akshyryn1,4 (AUTHOR), Tabylganov, Maxat1 (AUTHOR), Shilanov, Nurzhan2 (AUTHOR), Sarbopeyeva, Manshuk1,3 (AUTHOR), Nurlybai, Nurzhaina1,4 (AUTHOR), Nugumarov, Shyngys3 (AUTHOR), Gusmanova, Aigul1 (AUTHOR), Nugumarov, Yeldos4 (AUTHOR)
Source: Energies (19961073). Mar2026, Vol. 19 Issue 5, p1309. 15p.
Subject Terms: *Paraffin wax, *Oil fields, *Petroleum industry, *Scientific apparatus & instruments, *Light transmission
Geographic Terms: Kazakhstan
Abstract: This study is devoted to a comparative analysis of modern methods for determining the wax crystallization onset temperature (WCOT) of high-paraffin crude oil from the Uzen field. The objects of investigation were crude oil samples from the 13th reservoir horizon with a paraffin mass content ranging from 22.5% to 27.5%. For the first time in the practice of the oil and gas industry of Kazakhstan, a comprehensive comparison of results obtained using two fundamentally different approaches was performed: the light transmittance method using the KING-UNNP-70 apparatus, which simulates reservoir conditions (pressure of 12 MPa), and a dynamic method using a Wax Flow Loop facility, which reproduces crude oil flow in a pipeline. The experimental results showed that the light transmittance method detects the appearance of the first microcrystals at temperatures of 38.0–41.7 °C, whereas the dynamic method yields higher WCOT values, ranging from 41.0 °C to 44.0 °C. It was also found that the temperature of bulk crystallization, characterizing intensive solid phase formation, lies within the range of 33.5–35.0 °C. The results confirm that under flow conditions, paraffin crystallization begins at higher temperatures compared to static conditions, which is of critical importance for the design of crude oil gathering and transportation systems. The obtained data allow more accurate prediction of the risks of asphaltene–resin–paraffin deposits (ARPD) formation and optimization of technological operating conditions of wells at the late stage of field development. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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DbLabel: Energy & Power Source
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  Data: Comparative Analysis of Methods for Determining the Wax Crystallization Onset Temperature of High-Paraffin Crude Oil from the Uzen Field.
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  Data: <searchLink fieldCode="AR" term="%22Bayamirova%2C+Ryskol%22">Bayamirova, Ryskol</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Togasheva%2C+Aliya%22">Togasheva, Aliya</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Saduakassov%2C+Danabek%22">Saduakassov, Danabek</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zholbasarova%2C+Akshyryn%22">Zholbasarova, Akshyryn</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tabylganov%2C+Maxat%22">Tabylganov, Maxat</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shilanov%2C+Nurzhan%22">Shilanov, Nurzhan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sarbopeyeva%2C+Manshuk%22">Sarbopeyeva, Manshuk</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nurlybai%2C+Nurzhaina%22">Nurlybai, Nurzhaina</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nugumarov%2C+Shyngys%22">Nugumarov, Shyngys</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gusmanova%2C+Aigul%22">Gusmanova, Aigul</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nugumarov%2C+Yeldos%22">Nugumarov, Yeldos</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Mar2026, Vol. 19 Issue 5, p1309. 15p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Paraffin+wax%22">Paraffin wax</searchLink><br />*<searchLink fieldCode="DE" term="%22Oil+fields%22">Oil fields</searchLink><br />*<searchLink fieldCode="DE" term="%22Petroleum+industry%22">Petroleum industry</searchLink><br />*<searchLink fieldCode="DE" term="%22Scientific+apparatus+%26+instruments%22">Scientific apparatus & instruments</searchLink><br />*<searchLink fieldCode="DE" term="%22Light+transmission%22">Light transmission</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Kazakhstan%22">Kazakhstan</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study is devoted to a comparative analysis of modern methods for determining the wax crystallization onset temperature (WCOT) of high-paraffin crude oil from the Uzen field. The objects of investigation were crude oil samples from the 13th reservoir horizon with a paraffin mass content ranging from 22.5% to 27.5%. For the first time in the practice of the oil and gas industry of Kazakhstan, a comprehensive comparison of results obtained using two fundamentally different approaches was performed: the light transmittance method using the KING-UNNP-70 apparatus, which simulates reservoir conditions (pressure of 12 MPa), and a dynamic method using a Wax Flow Loop facility, which reproduces crude oil flow in a pipeline. The experimental results showed that the light transmittance method detects the appearance of the first microcrystals at temperatures of 38.0–41.7 °C, whereas the dynamic method yields higher WCOT values, ranging from 41.0 °C to 44.0 °C. It was also found that the temperature of bulk crystallization, characterizing intensive solid phase formation, lies within the range of 33.5–35.0 °C. The results confirm that under flow conditions, paraffin crystallization begins at higher temperatures compared to static conditions, which is of critical importance for the design of crude oil gathering and transportation systems. The obtained data allow more accurate prediction of the risks of asphaltene–resin–paraffin deposits (ARPD) formation and optimization of technological operating conditions of wells at the late stage of field development. [ABSTRACT FROM AUTHOR]
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        Value: 10.3390/en19051309
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      – Code: eng
        Text: English
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        PageCount: 15
        StartPage: 1309
    Subjects:
      – SubjectFull: Paraffin wax
        Type: general
      – SubjectFull: Oil fields
        Type: general
      – SubjectFull: Petroleum industry
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      – SubjectFull: Scientific apparatus & instruments
        Type: general
      – SubjectFull: Light transmission
        Type: general
      – SubjectFull: Kazakhstan
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      – TitleFull: Comparative Analysis of Methods for Determining the Wax Crystallization Onset Temperature of High-Paraffin Crude Oil from the Uzen Field.
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              Text: Mar2026
              Type: published
              Y: 2026
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