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Isothermal Crystallization Properties and Improved Rheological Performance of Waxy Crude Oil using Polyoctadecylacrylate-Modified Montmorillonite Composite as a Pour Point Depressant

Published online by Cambridge University Press:  01 January 2024

Bo Yao ,
Chuanxian Li ,
Fei Yang  and
Guangyu Sun
Bo Yao
Affiliation:
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266580, P.R.C. Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao, Shandong 266580, P.R.C.
Chuanxian Li
Affiliation:
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266580, P.R.C. Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao, Shandong 266580, P.R.C.
Fei Yang*
Affiliation:
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266580, P.R.C. Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao, Shandong 266580, P.R.C.
Guangyu Sun
Affiliation:
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266580, P.R.C. Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao, Shandong 266580, P.R.C.
*
*E-mail address of corresponding author: yangfei@upc.edu.cn
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Abstract

Recently, studies on the use of polymer nanomaterial composites as pour-point depressants (PPD) have drawn much attention, but the crystallization properties and improved rheological performance of waxy crude oils using nanoclay-based composite PPDs have rarely been reported. In this paper, montmorillonite (Mnt) was first organically modified using octadecyltrimethylammonium chloride (C21H46NCl, or stearyltrimethylammonium chloride) in aqueous solution. Then, the organically modified Mnt (OMnt) material was dispersed into a polyoctadecylacrylate (POA) matrix to prepare a POA/OMnt composite PPD by melt blending. The composition, structure, and morphology of Mnt, OMnt, and the POA/OMnt composite PPDs were investigated. The results showed that the OMnt and POA were compatible and that the OMnt was exfoliated into several sheets in the POA matrix. Subsequently, the isothermal crystallization kinetics of the POA/OMnt composite PPDs showed that small amounts of OMnt had a dramatic impact on POA chain motion during crystallization and facilitated POA crystallization. After it was added to a waxy crude oil, the POA/OMnt composite PPDs produced better rheological properties and performance than identical concentrations of the neat POA. The POA/OMnt composite PPDs can act as wax nucleation sites for wax molecule precipitation and result in larger and more compact wax crystal flocs, which adversely affect the formation of a wax crystal network and, thus, favor the improvement of waxy crude oil rheology.

Keywords

Isothermal Crystallization KineticsNanocomposite Pour Point DepressantOrganically Modified MontmorilloniteWaxy Crude Oil
Type
Article
Information
Clays and Clay Minerals , Volume 66 , Issue 3 , June 2018 , pp. 233 - 244
Copyright
Copyright © Clay Minerals Society 2018

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