Study on Consist Property of High Wax and Super-Viscous Crude Oil

2013 ◽  
Vol 724-725 ◽  
pp. 1062-1066
Author(s):  
Hong Zhang
Keyword(s):  
Hydrogen Bond ◽  
Crude Oil ◽  
Pour Point ◽  
High Viscosity ◽  
Polar Group ◽  
High Nitrogen ◽  
Form Hydrogen Bond ◽  
Polar Groups ◽  
Key Factor ◽  
Wax Crystal

The consist property analysis of Daqing and Nile-Oman high wax crude oil and Liaohe super-viscous crude oil was carried on in the paper. The result showed the key factor of high wax crude oil pour point increasing lies in the wax crystal forming and growing and agglomerating at low temperature. The reason of high viscosity of Liaohe super-viscous crude oil has correlation to the high nitrogen polar group weight. The polar groups can form hydrogen bond to make adhesion stronger. At the same time, the crude oil flowing was restrained by increase the macromolecule connection agglomeration in crude oil. The analysis of resin wax ratio of crude oil showed the better viscosity decline effect was appeared only in the condition of resin wax ratio was appropriate.

Study on Parrifine Removal Additive of High Wax Crude Oil

2014 ◽  
Vol 960-961 ◽  
pp. 11-13
Author(s):  
Hong Zhang
Keyword(s):  
Crude Oil ◽  
Heating Temperature ◽  
Property Analysis ◽  
Key Factor ◽  
Wax Crystal

The consist property analysis of Shenbei and simulation high wax crude oil was carried on in the paper. The result showed the key factor of temperature lies in the wax crystal forming and growing. only when the heating temperature is high, the wax can be fully dissolved in crude oil drop dispersed, glial, asphaltene can be fully dissolved, agent and in crude oil.

Study of Polymeric Crude Oil Fluid Improver Crystallinity

2011 ◽  
Vol 236-238 ◽  
pp. 582-585
Author(s):  
Hong Zhang ◽  
Wen Fa Xiao
Keyword(s):  
Low Temperature ◽  
Crude Oil ◽  
Pour Point ◽  
Close Correlation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Polymer Fluid ◽  
Wax Crystal ◽  
The Difference ◽  
Fluid Behaviour

The characteristic groups of polymer were analyzed by the IR spectrometrer. The crystallinity of different style wax crystal and the fluid improver additive(FIA) were measured by the X-ray diffraction analysis. The results showed crystallinity of wax crystal was close correlation with the polymer fluid improver and the change of wax crystal dispersibilty will be caused by the difference of crystallinity which make change of pour point depressing behaviour of the crude oil. At the same time found when crystallinity of the wax crystal was match with the additive the wax crystal dispersibilty and pour point depressing and viscosity depressing will change well that was proved by fluid behaviour improving at low temperature of crude oil system.

scholarly journals Method for Exploiting High-viscosity and High-pour-point Crude Oil

2021 ◽  
Vol 1838 (1) ◽  
pp. 012040
Author(s):  
Wei Xie ◽  
Lei Chen ◽  
Zhixue Xia ◽  
Fang Wang ◽  
Jianguo Ou ◽  
...  
Keyword(s):  
Crude Oil ◽  
Pour Point ◽  
High Viscosity

scholarly journals Pour point depression and flow improvement of waxy crude oil using polyethylene glycol esters of cashew nut shell liquid

2021 ◽  
Author(s):  
William Iheanyi Eke ◽  
Sampson Kofi Kyei ◽  
Ozioma Achugasim ◽  
Joseph Atubokiki Ajienka ◽  
Onyewuchi Akaranta
Keyword(s):  
Crude Oil ◽  
Pour Point ◽  
Crystal Morphology ◽  
Micro Structure ◽  
Waxy Crude Oil ◽  
Cashew Nut Shell Liquid ◽  
Waxy Crude ◽  
Cashew Nut ◽  
Wax Crystal ◽  
Cashew Nut Shell

AbstractWax crystallization and deposition is a major flow assurance problem in production and transportation of waxy crude oil. Conventional flow improvers are mainly high molecular weight synthetic polymers, many of which are eco-toxic. Bio-based flow improvers derived from natural products are promising as inexpensive, eco-friendly alternatives to existing products. In this study, natural cashew nut shell liquid (CNSL) extracted from waste shells of Anacardium occidentale was esterified with polyethylene glycol (PEG). CNSL derivative reduced the pour point of waxy crude oil by 12 °C at 1000 ppm. The effects of CNSL derivatives on wax crystal morphology and micro-structure were studied by cross-polarized microscopy. Micrographs were processed and analyzed with ImageJ software. Addition of CNSL derivatives to oil resulted in changes in wax crystal morphology and micro-structure evidenced by a reduction in average crystal Feret diameter and aspect ratio and increase in boundary fractal dimension, indicative of formation of increasing number of smaller, rounder crystals. Effect of the additives on flow properties of the waxy oil was determined using a co-axial cylinder rotational viscometer. Dynamic viscosity of oil at shear rate of 17 s−1 was reduced by 79.7–90.5%. CNSL-PEG esters show good prospects as low-cost additives for production, storage and pipeline transportation of waxy crude oil.

Prediction of the Interaction between Crude Oil Wax-Crystal Fractions and Acrylate Polymers by Monte Carlo Simulation

2013 ◽  
Vol 295-298 ◽  
pp. 3158-3161
Author(s):  
Zhao Jun Chen ◽  
Hong Yu Zhang ◽  
Chao He Yang ◽  
Hong Hong Shan
Keyword(s):  
Crude Oil ◽  
Chain Length ◽  
Building Block ◽  
Pour Point ◽  
Building Blocks ◽  
Side Chain ◽  
Precipitation Process ◽  
Side Chain Length ◽  
Wax Crystal ◽  
Pour Point Depressants

The interaction between n-alkanes and pour point depressants with different structures was investigated. Using n-hexadecane as the representative component of crude oil n-alkanes, molecular simulation was employed to study the interaction between polyacrylate pour point depressants with different side chain length and n-hexadecane, and the interaction between polyacrylate pour point depressants with different polar building blocks and n-hexadecane. It was shown that during wax precipitation process, the mixed energy is low when the side chain length of acrylate is compatible with n-hexadecane. It is easier for polyacrylate to go into wax-crystal lattice, thus lowering crude oil pour point. The simulation for pour point depressants consisting of acrylate and other different polar building blocks demonstrated that the stronger the polarity of polar building block, the lower the interaction energy between polymer pour point depressant and n-hexadecane. At the same time, it is easier for polymers with polar building blocks to interact with n-alkanes. The polar building block can effectively inhibit wax-crystal growth and thus improve crude oil low-temperature fluidity.

scholarly journals Synthesis of Alkyl Aliphatic Hydrazine and Application in Crude Oil as Flow Improvers

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4703
Author(s):  
Qiang Deng ◽  
Michal Slaný ◽  
Huani Zhang ◽  
Xuefan Gu ◽  
Yong-Fei Li ◽  
...  
Keyword(s):  
Crude Oil ◽  
Pour Point ◽  
Alkyl Chain ◽  
Reduction Rate ◽  
Viscosity Reduction ◽  
Polar Group ◽  
Waste Oil ◽  
Viscosity Reducer ◽  
Oilfield Chemicals ◽  
Long Alkyl Chain

In this paper, alkyl aliphatic hydrazine, which is different from traditional polymer fluidity improver, was synthesized from aliphatic hydrazine and cetane bromide, and evaluated as a pour point and viscosity-reducer depressant for crude oil. The evaluation results showed that alkyl aliphatic hydrazone fully reduced the pour point and viscosity of crude oil with the increase of crude oil fluidity. The viscosity reduction rate of crude oil in Jinghe oilfield was 79.6%, and the pour point was reduced by about 11.3 °C. The viscosity reduction rate of crude oil in Xinjiang Oilfield was 74.7%, and the pour point was reduced by 8.0 °C. The long alkyl chain is beneficial to the eutectic of wax in crude oil, and the polar group inhibits the crystal growth, resulting in the decrease of pour point and viscosity. The waste oil is fully recycled into oilfield chemicals.

scholarly journals Ethylene-Vinyl Acetate Copolymer/Crude Gossypol Compositions as Pour Point Depressants for Waxy Oil

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Bekaidar T. Marenov ◽  
Kazim S. Nadirov ◽  
Manap K. Zhantasov ◽  
Rashid K. Nadirov
Keyword(s):  
Crude Oil ◽  
Vinyl Acetate ◽  
Pour Point ◽  
Ethylene Vinyl Acetate ◽  
Oil Field ◽  
Wax Deposition ◽  
Chemical Additives ◽  
Polar Groups ◽  
Pour Point Depressants ◽  
Acetate Copolymer

Wax deposition from crude oil that blocks the pipeline and increases the viscosity of the fluid is considered as a serious challenge for petroleum transportation. Employment of chemical additives, the so-called pour point depressants (PPDs), is widely used to solve this problem. Among them are the ethylene-vinyl acetate (EVA) copolymers (EVAc), containing a polyethylene segment along the backbone with vinyl acetate. To improve the performance of EVAc as PPD, the compositions of this polymer with crude gossypol (CG), isolated from the refined cottonseed oil soapstock, were prepared by joint milling in a ball mill. Prepared compositions were characterized by Fourier transform infrared (FTIR), ultraviolet (UV), and nuclear magnetic resonance (NMR) spectroscopy. The pour point and viscosity of the crude oil from the Akshabulak oil field (Kazakhstan) were studied. The compositions with 10, 20, and 25 wt% of CG demonstrate better efficiency as PPD for crude oil than EVAc at the dosage of PPD of 50, 100, 250, and 500 ppm. The improved properties of the obtained PPD in comparison with the commercial EVAc is explained by the appearance of additional nonpolar and polar groups caused by the formation of the EVAc/CG composition.

Effect of Pour Point Depressants on the Impedance Spectroscopy of Waxy Crude Oil

2020 ◽  
Vol 35 (1) ◽  
pp. 433-443
Author(s):  
Hongying Li ◽  
Chaohui Chen ◽  
Qian Huang ◽  
Yifei Ding ◽  
Yu Zhuang ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Crude Oil ◽  
Pour Point ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Pour Point Depressants
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