Measurement and Prediction of the Kinetics of Paraffin Deposition

Brown, T.S.; Niesen, Vicki G.; Erickson, Dale

doi:10.2118/26548-ms

Cited by 61 publications

(39 citation statements)

References 6 publications

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“…Early models attempted to predict the growth of the deposit thickness using the radial convective mass flux of the wax molecules. [2][3][4]6,7 Unfortunately, these early models all assumed the wax content inside the gel to be constant, and it is now known that the wax fraction in the deposit increases as the deposit thickens. 8,9 This phenomenon is called aging and causes an increase in the thermal conductivity of the deposit layer and a decrease in the molecular diffusivity of wax in the deposit.…”

Section: Basis Of Wax Depositionmentioning

confidence: 99%

Wax deposition modeling of oil/water stratified channel flow

et al. 2011

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in Wiley Online Library (wileyonlinelibrary.com).Wax deposition modeling becomes complicated when multiphase flow is involved. Empirical heat and mass transfer correlations are unreliable for multiphase deposition modeling and full scale computational fluid dynamics calculations require expensive computational intensity. In this work, numerical methods are used to study wax deposition in oil/water stratified flow through a channel. A unidirectional flow analysis is used to calculate the nonisothermal hydrodynamics and mass transfer. It was found that the change in the position of the oil/water interface throughout the channel must be taken into accounted for the mass balance to be valid. Unfortunately, this change has not been accounted for in all previous studies. In addition, the growth of the wax deposit as a function of time along with the effect of oil/water flow rate ratio is discussed. The presence of water significantly reduces the severity of wax deposition by altering the heat and mass transfer characteristics.

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Section: Basis Of Wax Depositionmentioning

confidence: 99%

Wax deposition modeling of oil/water stratified channel flow

et al. 2011

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“…With regard to the process and mechanism of wax deposition in the tube, scholars generally believed that molecular diffusion is the main mechanism of wax deposition. Through a large number of experimental and theoretical studies, many valuable wax deposition models have been established by scholars (Huang Q Y, et al, 2008;Zheng et al, 2017;Noville et al, 2012;Singh et al, 2011;Amine et al, 2008;Sadra et al, 2014;Brown et al, 1993;Eskin et al, 2014). In the process of establishing the wax deposition model, the determination of temperature gradient and concentration gradient is very important.…”

Section: Introductionmentioning

confidence: 99%

The Study on Calculation Method of Temperature Distribution of Tested Tube for Wax Deposition Experimental Loop

Rong-ge¹,

Jin²,

Tian³

et al. 2018

Frontiers in Heat and Mass Transfer

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The loop experiment device plays an important role in the study of wax deposition, and the calculation of the temperature distribution of the test section is the key to establish the wax deposition model. In the conditions of the wax deposition was not formed and constant wall temperature of the tube, the energy balance equation is solved by using separation of variables and combining the Kummer equation (S-K method), the distribution law of temperature in the test section is obtained, and the solution results was compared with Svendsen method, the difference between the results obtained by the two methods and the experimental results is also analyzed. The results showed that, the temperature distribution of the test section is consistent with the two methods, and the computing result of Svendsen method is generally higher than the S-K method. Under different axial distances for the take value, the maximum difference of computing results between the two methods is large when the position is farther away from the entrance, and the maximum difference is 0.27℃. Under different radial distances for the take value, with the increase of the axial distance, the difference between the results obtained by the two methods increases gradually in general, and the greater the radial distance, the greater the difference, the maximum difference is 0.27 ℃, thus the calculation results of these two kinds of methods have a higher coincide degree. The results obtained by the two methods are higher than the experimental results, but the difference is small, the results obtained by the S-K method are closer to the experimental results, and this method can avoid solve the numerical integration (Svendsen method) and the inconvenience of Bessel function, so it has a certain advantages.

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“…These crystals lead to the formation of paraffin wax deposits because of temperature and pressure reduction, and the escape of light alkanes to the atmosphere (Bott, 1997;Azevedo and Texeira, 2003). Furthermore, the crystals attach to the walls of the oil wells, the casing wall, pump, and other production equipment, which reduces the mobility of oil and blocks the transport in the pipelines (Brown et al, 1993;Leorpz, 2004;Huang et al, 2010). According to reports, more than half of the extractable oil remains underground after the first and second attempts at oil recovery.…”

Section: Introductionmentioning

confidence: 99%

Isolation and characterization of a novel paraffin wax-degrading bacterium, Pseudomonas sp strain PW-1, from petroleum-contaminated sites

Zhang

2016

Genet. Mol. Res.

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ABSTRACT. An isolate capable of degrading paraffin wax was isolated from petroleum-contaminated sites in Daqing, China, and identified as Pseudomonas sp strain PW-1 by analyzing the 16S rDNA sequence (GenBank accession No.: KF529529) as well as the biochemical and physiological characteristics. The optimized degradation conditions of the isolate were as follows: FeSO 4 metal ion concentration of 0.01 g, temperature of 30°C, (NH 4 ) 2 SO 4 nitrogen source concentration of 1.5 g/L, and a carbon: nitrogen ratio of 10:1. Response surface methodology-based analysis of the culture time, inoculation amount, and initial pH of the medium revealed that the optimal theoretical conditions were a culture time of 11.16 days, inoculation amount of 3.13%, and an initial pH of 9.29. The theoretical degradation rate was up to 54.68% under the optimal conditions. Taking into account the experimental conditions of a laboratory, 11.2 days of cultivating time, 3% inoculum, and a medium initial pH of 9.3 were used in practical settings. Experimental results showed that the degradation rate of paraffin wax was 52.85%, which demonstrated that this strain could degrade 1050 mg paraffin wax, using it as the sole carbon source, in a 1000-mL minimal salts medium. These results indicate that the strain PW1 can be used for application in oil wells with paraffin deposition problems in order to enhance oil recovery.

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Measurement and Prediction of the Kinetics of Paraffin Deposition

Cited by 61 publications

References 6 publications

Wax deposition modeling of oil/water stratified channel flow

Wax deposition modeling of oil/water stratified channel flow

The Study on Calculation Method of Temperature Distribution of Tested Tube for Wax Deposition Experimental Loop

Isolation and characterization of a novel paraffin wax-degrading bacterium, Pseudomonas sp strain PW-1, from petroleum-contaminated sites

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