摘要
针对聚驱后油藏特点研发了黏弹性颗粒驱油剂(B-PPG)。文中研究了黏弹性颗粒驱油剂溶液与煤油间的界面张力和扩张流变性质,考察了盐度、二价离子和温度对体系界面张力及扩张流变参数的影响。结果表明,高浓度时,B-PPG通过烷基链的疏水作用形成了二维网络结构,提升了界面膜的强度,临界缔合浓度为1000mg/L。NaCl压缩双电层,增大了B-PPG分子的界面吸附量,界面张力显著降低;同时,由于分子间静电相互作用减弱,扩张弹性急剧降低,而扩散交换的加快导致扩张黏性降低。二价阳离子的加入,造成界面分子排列的紧密程度有所降低,界面张力略有升高。二价阳离子还可以增强B-PPG形成的聚集体结构,导致扩张弹性略有增大。升高温度,加速了B-PPG分子的热运动,扩散交换过程变快,界面膜强度降低。
In order to improve the recovery of reservoir after polymer flooding and screen the new chemical oil displacement agent,the interfacial tensions(IFTs)and dilational rheological properties of pre-crosslink gel particle solution against kerosene were studied.The effects of salinity,divalent cation and temperature on IFTs and dilational rheological properties were investigated.The results show that branched preformed particle gel(B-PPG)molecules can form a two-dimensional network through hydrophobic interactions between alkyl chains,which enhacnes the strength of interfacial film at high concentration.The critical aggregate concentration of B-PPG is1000 mg/L.NaCl compresses double electricity layer,resulting in an increase in the adsorption of B-PPG molecules and a consequent obvious decrease in IFTs.At the same time,the dilational elasticity decreases sharply due to the decreased electrostatic interaction among B-PPG molecules,while the dilational viscosity decrease attributes to the faster diffusion exchange.A slight increase in IFTs may be due to the looser packing of the interfacial molecules in addition of divalent cation.The divalent cation will enhance aggregation structure formed by B-PPG molecules,which cause a slight increase in dilational elasticity.A rise in temperature accelerates the thermal motion of B-PPG molecules and speeds up diffusion exchange,which resultes in lower interfacial film strength.
作者
姜祖明
陈晓彦
元福卿
曹小朋
Zuming Jiang;Xiaoyan Chen;Fuqing Yuan;Xiaopeng Cao(Exploration and Development Research Institute of Shengli Oilfield,SINOPEC,Dongying 257015,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2023年第12期97-102,共6页
Polymer Materials Science & Engineering
基金
泰山产业领军人才项目(tscx 202306048)
中国石化重点实验室课题(KL22004)。
关键词
黏弹性颗粒驱油剂
盐度
二价离子
温度
界面张力
扩张流变容
branched preformed particle gel
salinity
divalent cation
temperature
interfacial tension
dilational rheology
