摘要
目前油田聚合物驱主要研究的是提高采收率和驱油机理,在采出污水稳定性方向少有报道。为了解决这一问题,本文针对一种表活聚合物(活化剂)对采出污水稳定性的影响进行了研究。首先通过测量离心后污水的吸光度研究了未处理、剪切水解前和剪切水解后3种状态的活化剂对模拟采出污水稳定性的影响,接着用zeta电位仪、分配系数实验和双偏振光极化干涉测量分析仪(DPI)测试评价了模拟采出污水中油滴之间的静电相互作用和空间位阻效应,用界面参数一体测量系统测试和评价了活化剂对油水界面的界面张力、弹性模量、黏弹性模量和扩张模量的影响。实验结果表明,模拟活化剂驱采出污水稳定性低于模拟水驱采出污水稳定性;当污水中存在活化剂时,污水中油滴间的静电作用、扩张模量和弹性模量下降,从而降低了采出污水稳定性,且分子量的大小对此结果无影响,但活化剂水解度增大后,采出污水稳定性降低则是因静电作用和粘性模量的降低。当污水中已存在活化剂时,随着活化剂浓度增加,污水稳定性增强,主要是因为油水界面膜强度增强,界面张力降低。
Research of polymer flooding was mainly about the recovery rate and oil displacement mechanism,but not the stability of produced wastewater.To solve this problem,the effect of a surface-active polymer(activating agent)on the stability of oily wastewater produced from activating agent flooding was studied.Firstly,the effects of three activating agents including untreated,sheared,sheared and hydrolyzed activating agent on the stability of simulated oily wastewater were studied by measuring the absorbance of oily wastewater after centrifugation.Then,zeta potential analyzer,distribution coefficient experiments and dual polarized light polarization interferometry analyzer(DPI)were used to measure the electrostatic interaction and steric hindrance effect among the oil droplets in simulated oily wastewater.Effect of activating agent on interfacial tension,modulus of elasticity,viscoelastic modulus and dilatation modulus were also tested by an integrated measurement system of interface parameters.The results showed that stability of simulated oily wastewater produced from activating agent flooding was lower than that from water flooding.When there was an activating agent in the oily wastewater,static effect,dilatation modulus and elasticity modulus decreased,thus the stability of the oily waste water was reduced.The molecular weight has no effect on this result.However,the reason of decreasing stability of oily wastewater caused by the increase of degree of hydrolysis of activating agent was that the static effect and viscous modulus decreased.When the activating agent already existed in wastewater and activating agent concentration increased,stability of oily wastewater could be enhanced mainly because of enhanced interfacial film strength and decreased interfacial tension.
作者
岑驰
朱莹
段明
CEN Chi;ZHU Ying;DUAN Ming(School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,Sichuan,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2018年第10期4074-4079,共6页
Chemical Industry and Engineering Progress
基金
国家重大专项子课题项目(2016ZX05025-003-003)
关键词
表活聚合物驱
采出污水
稳定性
surface-active polymer flooding
oily wastewater
stability
