THE INFLUENCE OF VINYL ACETATE CONTENT OF THE POLY(ETHYLENE-CO-VINYL ACETATE) (EVA) ADDITIVE ON THE VISCOSITY AND THE POUR POINT OF A BRAZILIAN CRUDE OIL

2001 ◽  
Vol 19 (1-2) ◽  
pp. 197-204 ◽  
Author(s):  
André L. C. Machado ◽  
Elizabete F. Lucas
Keyword(s):  
Crude Oil ◽  
Vinyl Acetate ◽  
Pour Point ◽  
Poly Ethylene

scholarly journals Study the rheological properties of waxy oil with modified pour point depressants for the South Turgai oil field in Kazakhstan

2019 ◽  
Vol 74 ◽  
pp. 28 ◽  
Author(s):  
S.S. Kozhabekov ◽  
A.A. Zhubanov ◽  
Zh. Toktarbay
Keyword(s):  
Crude Oil ◽  
Vinyl Acetate ◽  
Pour Point ◽  
Oil Field ◽  
Ftir Analysis ◽  
The South ◽  
Waxy Oil ◽  
Pour Point Depressants ◽  
Poly Ethylene ◽  
Eva Copolymer

This work describes the performance of poly(ethylene-co-vinyl acetate) (EVA) copolymer and modified poly(ethylene-co-vinyl acetate) (EVA-M) as pour point reducer. Commercially available EVA copolymer modified with sodium hydroxide in methanol. Partially hydrolyzed EVA was obtained and Fourier Transform InfraRed (FTIR) analysis of the modified EVA was recorded. The modified and unmodified EVA was used to crude oil of South Turgai, Kazakhstan, in order to improve the flowability of the crude oil. According to the rheological behavior of oils in the South Turgai, the findings showed that modified EVA lowered the dynamic viscosity greater compared to unmodified EVA and heat treatment. Dynamic viscosities and yield points of different oils with various temperatures with using EVA and EVA-M were studied systematically. Finally microphotograph of crystal structures two oils with using EVA and EVA-M, under same conditions, were compared and discussed.

Influence of the chemical structure of additives poly(ethylene‐co‐vinyl acetate)‐based on the pour point of crude oils

2020 ◽  
Vol 137 (33) ◽  
pp. 48969
Author(s):  
Lize M. S. L. Oliveira ◽  
Rita C. P. Nunes ◽  
Larissa M. B. Pessoa ◽  
Leidiane G. Reis ◽  
Luciana S. Spinelli ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Pour Point ◽  
Chemical Structure ◽  
Crude Oils ◽  
Poly Ethylene

scholarly journals Adsorption of Polymeric Additives Based on Vinyl Acetate Copolymers as Wax Dispersant and Its Relevance to Polymer Crystallization Mechanisms

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Ayman M. Atta ◽  
Rasha A. El-Ghazawy ◽  
Fatma A. Morsy ◽  
Ali M. S. Hebishy ◽  
Abdullah Elmorsy
Keyword(s):  
Crude Oil ◽  
Vinyl Acetate ◽  
Pour Point ◽  
Flow Characteristics ◽  
Polymeric Materials ◽  
Feed Ratio ◽  
Rheological Parameters ◽  
Waxy Crude Oil ◽  
Point Depressant ◽  
Flow Improver

The present work has main target to study the effect of additives molecular weight and composition on the flow characteristics of wax crude oil at low temperature below pour point temperature. In this respect, maleic anhydride ester-co-vinyl acetate copolymers with varied monomers feed ratios and different alkyl ester lengths, namely, dodecyl, stearyl, and behenyl alkyl chains, were prepared. These polymeric materials were characterized by FTIR,1HNMR, and GPC. The performance of these additives as pour point depressants and flow improver for Egyptian waxy crude oil was evaluated through measurements of pour point and rheological parameters (viscosity and yield stress). It was observed that stearyl maleate-vinyl acetate copolymer with 1 : 2 feed ratio shows the best efficiency as pour point depressant even at low concentration while octadecyl maleate-vinyl acetate copolymers with 2 : 1 feed ratio are effective as flow improver.

scholarly journals Comparison of pour point depressant (PPD) ethylene-vinyl acetate (EVA) and nano-montmorillonite

2021 ◽  
Vol 894 (1) ◽  
pp. 012019
Author(s):  
Z D Nurfajrin ◽  
B Satiyawira ◽  
R A Putra
Keyword(s):  
Crude Oil ◽  
Vinyl Acetate ◽  
Pour Point ◽  
Ethylene Vinyl Acetate ◽  
Oil Viscosity ◽  
Pour Point Depressant ◽  
Oil Transportation ◽  
Point Depressant ◽  
Wax Deposits ◽  
Wax Crystals

Abstract One of the problems with oil production is stuck of oil transportation flow in the pipeline caused by wax deposits. The high wax content in crude oil causes the oil viscosity value to increase so that crude oil has High Pour Point Oil (HPPO) properties. In this research, using crude oil sample with initial pour point of 31oC and viscosity of 556 cP. This samples are classified as heavy oil. Therefore, this sample is suitable for use as an experiment in this research. There are several methods to deal with HPPO. One chemical method used to overcome this problem is adding Pour Point Depressant (PPD) to crude oil. This PPD functions to decrease pour point value by binding wax crystals in crude oil. In this study, two types of PPD were compared, Ethylene-Vinyl Acetate (EVA) and Nano-Montmorillonite (Nano-MMT). Both can reduce the pour point value on crude oil, but PPD EVA shows a more excellent reduction than nano-MMT. The results show that EVA is better at binding crystals than nano-MMT. After the injection of 400 ppm EVA, the pour point value of crude oil could be decreased up to 24oC, and the viscosity also decreased by 185 cP.

Effect of Polyethylene-Vinyl Acetate Pour Point Depressants on the Flow Behavior of Degassed Changqing Waxy Crude Oil before/after scCO2 Extraction

2019 ◽  
Vol 33 (6) ◽  
pp. 4931-4938 ◽  
Author(s):  
Shuang Yang ◽  
Chuanxian Li ◽  
Fei Yang ◽  
Xiaoteng Li ◽  
Guangyu Sun ◽  
...  
Keyword(s):  
Crude Oil ◽  
Vinyl Acetate ◽  
Pour Point ◽  
Flow Behavior ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Pour Point Depressants

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.

Sign in / Sign up

Export Citation Format

Share Document