Pre-heating temperature induced flowability and wax deposition characteristics of crude oil adding wax inhibitors

作     者：Bo Yao Hao-Ran Zhu Bao-Dong Yan Chuan-Xian Li Fei Yang Guang-Yu Sun Hong-Bo Zeng 

作者机构：College of Pipeline and Civil EngineeringChina University of PetroleumQingdaoShandong266580People's Republic of China Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonABT6G 1H9Canada School of Petroleum EngineeringChangzhou UniversityChangzhouJiangsu213164People's Republic of China China Oil&Gas Pipeline Network CorporationBeijing100020China 

出 版 物：《Petroleum Science》 (石油科学(英文版))

年 卷 期：2023年第20卷第4期

页      面：2468-2478页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：The authors thank the financial support from the National Natural Science Foundation of China(51904327,U19B2012) China University of Petroleum Innovation Project(22CX06050A). 

主　　题：Pre-heating treatment Wax inhibitor Flowability Wax deposition Waxy crude oil 

摘      要：This paper investigated the effects of pre-heating treatment temperatures(T_(pre))on the flowability and wax deposition characteristics of a typical waxy crude oil after adding wax inhibitors.It is found that there is little difference in wax precipitation exothermic characteristics of crude oils at different T_(pre),as well as the wax crystal solubility coefficient in the temperature range of 25-30℃.For the undoped crude oil,the flowability after wax precipitation gets much improved and the wax deposition is alleviated as T_(pre)increasing.At T_(pre)=50℃,the viscosity and wax deposition rate of crude oil adding wax inhibitors are higher than those of the undoped crude oil.When the T_(pre)increases to 60,70,and 80℃,the flowability of the doped crude oil are largely improved and the wax deposition is suppressed with the T_(pre)increase,but the wax content of wax deposit increases gradually.It is speculated that,on the one hand,the T_(pre)increase helps the dispersion of asphaltenes into smaller sizes,which facilitates the co-crystallization with paraffin waxes and generates more aggregated wax crystal flocs.This weakens the low-temperature gel structure and increases the solid concentration required for the crosslink to form the wax deposit.On the other hand,the decrease in viscosity increases the diffusion rate of wax molecules and accelerates the aging of wax deposits.The experimental results have important guiding significance for the pipeline transportation of doped crude oils.