Effect and mechanism of BEM/PMSQ hybrid pour point depressant on Qinghai waxy crude oil

SHI Xin; MA Xiaobin; YANG Fei; LI Chuanxian; YAO Bo; SUN Guangyu

doi:10.11949/j.issn.0438-1157.20170249

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Effect and mechanism of BEM/PMSQ hybrid pour point depressant on Qinghai waxy crude oil

更新时间：2025-12-10

- Effect and mechanism of BEM/PMSQ hybrid pour point depressant on Qinghai waxy crude oil
- CIESC Journal Issue 8, Pages: 3014-3022(2017)
- 作者机构：
  
  1. 中国石油大学(华东)储运与建筑工程学院,山东,青岛,266555
  2. 中国石油天然气公司青海油田管道输油处, 青海格尔木,816000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170249
  CLC： E832
- Online First：12 May 2017，
  
  Published：12 May 2017
- 稿件说明：
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SHI Xin, MA Xiaobin, YANG Fei, et al. Effect and mechanism of BEM/PMSQ hybrid pour point depressant on Qinghai waxy crude oil[J]. CIESC Journal, 2017, (8): 3014-3022.
DOI：

SHI Xin, MA Xiaobin, YANG Fei, et al. Effect and mechanism of BEM/PMSQ hybrid pour point depressant on Qinghai waxy crude oil[J]. CIESC Journal, 2017, (8): 3014-3022. DOI： 10.11949/j.issn.0438-1157.20170249.

摘要

基于聚甲基硅倍半氧烷（PMSQ）微球良好的有机相容性与规则的微观球形形貌，将PMSQ微球与BEM降凝剂通过熔融共混制备了BEM/PMSQ杂化降凝剂。以青海含蜡原油为研究对象，通过流变实验评价了BEM/PMSQ杂化降凝剂对原油的凝点、黏弹性、黏度与屈服值的影响，利用偏光显微镜观察了加剂前后原油蜡晶形貌的变化，并与单独添加BEM降凝剂的油样进行了对比。结果表明：不加剂原油凝点27.0℃；在相同的降凝剂加量下（100 μg·g-1），降凝效果最好的是BEM/PMSQ 2%杂化降凝剂，可降低原油凝点19.0℃，相较于添加BEM降凝剂，进一步降凝6.0℃，降低胶凝点4.3℃，10℃时平均降黏率39.0%，G'值降低了62.0%。PMSQ微球与BEM/PMSQ杂化降凝剂在十二烷中的分散状态照片表明PMSQ微球表面吸附了BEM降凝剂，从而在原油中作为蜡晶的成核模版存在，使所形成的蜡晶结构更为紧凑，包覆更少的液态油，从而改善原油的宏观流变性。

Abstract

Based on the outstanding organic compatibility and the micro spherical morphology of polymethylsilsesquioxane (PMSQ) microspheres

BEM/PMSQ hybrid pour point depressant was prepared by melt blending method. Then

the effect of BEM/PMSQ hybrid pour point depressant on the pour point

viscoelasticity

viscosity and yield value of Qinghai waxy crude oil was evaluated by rheological experiment and the morphology of wax crystals was observed by the polarizing microscope. The results showed that the pour point of the undoped crude oil was 27.0℃; compared with the same dosage of the neat BEM (100 μg·g-1)

BEM/PMSQ 2% hybrid pour point depressant has the best performance

which can further reduce the pour point of 6.0℃

the gelation point of 4.3℃

the apparent viscosity of 39.0% and G' of 62.0%. The dispersion state of PMSQ microspheres and BEM/PMSQ hybrid pour point depressant in the dodecane showed that BEM were adsorbed on the surface of PMSQ microspheres

and acted as the wax crystal nucleation templates in the crude oil

thus resulting in the formation of the compact wax crystal structure and coating with less liquid oil

so as to improve the rheology of crude oil.

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