Measurement of wax deposition in paraffin solutions

Wu, Chi Chang; Wang, Kang-Shi; Shuler, Patrick; Tang, Yongchun; Creek, Jefferson L.; Carlson, Robert M. K.; Cheung, Stephen K.

doi:10.1002/aic.690480923

Cited by 54 publications

(59 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A "cold disk" apparatus, originally designed at CalTech, was used to screen the chemicals. This apparatus is a cylindrical vessel with a polished stainless steel disk imbedded in the wall (Wu et al, 2002). The vessel contains a rotating impeller connected to a spinning rotor.…”

Section: Chemicals and Experimental Detailssupporting

confidence: 43%

Study of Wax Inhibition in Different Geometries

2012

View full text Add to dashboard Cite

Wax inhibitors are sometimes used to reduce the rate of wax deposition in pipelines. The efficiency of the inhibitors depends on several factors such as the right chemistry, injection or introduction at the correct location, targeting the right operating conditions and testing appropriately. It is known that bench top tests such as cold finger tests, while useful to qualitatively gauge chemical performance, are not useful to quantitatively predict the performance of a chemical under field operating conditions. This is because the operating parameters such as the temperature difference, heat flux, and shear rates experienced in the field cannot be reproduced in such bench top devices simultaneously.In this study, we discuss the use of a "cold disk" apparatus for screening chemicals to reduce wax deposition rates of a relatively waxy offshore crude oil. Several chemicals were screened by choosing temperature differentials similar to those expected in the field where maximum deposition was predicted to occur. The best chemical was then chosen for larger scale flow loop study. Flow loop deposition experiments were performed with the chosen chemical after appropriately choosing the flow rate and heat flux to drive the deposition. The results showed quantitatively good agreement with the cold disk experiment.Testing and agreement at such different scales provided a greater degree of confidence in the efficiency of the wax inhibitor, although it is understood that field performance may still vary depending on various other factors some of which relate to operating conditions, fluid composition, wax content, pipeline size and shear. Modeling deposition in the flow loop also improved the confidence in these results.

show abstract

Section: Chemicals and Experimental Detailssupporting

confidence: 43%

Study of Wax Inhibition in Different Geometries

2012

View full text Add to dashboard Cite

show abstract

“…A ''cold disk'' wax deposition (CoDWaD) apparatus was used in this study to produce realistic, ''field like'' deposits. This technique for wax deposition experiments has the further advantages of requiring only a small sample size and a relatively short run time (Wu et al, 2002).…”

Section: Introductionmentioning

confidence: 48%

Evaluation of Effects of Selected Wax Inhibitors on Paraffin Deposition

Wang

Creek

et al. 2003

Petroleum Science and Technology

Self Cite

View full text Add to dashboard Cite

“…Measurement and prediction of wax solubility in oil and model hydrocarbon solutions were carried out by Gudmundsson and Bott (1977), Al-Ahmad et al (1990), Srivastava et al (1997) and Wu et al (2002). Those studies covered the wide range of wax crystallization conditions at various wax concentration.…”

Section: Introductionsupporting

confidence: 42%

Wax precipitation in multicomponent hydrocarbon system

Struchkov

Рогачев

2016

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

The objective of this research is to estimate individual effect of various external parameters such as pressure, cooling rate, watercut and addition of mechanical impurities on change in wax appearance temperature (WAT) in oil. In this paper, complex multicomponent system like oil is replaced to simplified model solution, presented by wax in kerosene solution. Research methods in the study were visual method at high-pressure/hightemperature conditions and rheological method under ambient pressure. Experimental results shown that WAT grows with increase in concentration of wax in solution, increase in pressure, watercut, shear rate, addition of mechanical impurities and decrease in gap size of the measuring system (for rheological method). Numerical dependences of WAT in solution on the listed factors are received. Research data are explained by the thermodynamic processes proceeding in model solution. Influence of wax inhibitors addition on process of the crystal structure formation in model solutions and effective wax inhibitors is defined.

show abstract

Measurement of wax deposition in paraffin solutions

Cited by 54 publications

References 5 publications

Study of Wax Inhibition in Different Geometries

Study of Wax Inhibition in Different Geometries

Evaluation of Effects of Selected Wax Inhibitors on Paraffin Deposition

Wax precipitation in multicomponent hydrocarbon system

Contact Info

Product

Resources

About