摘要
以聚丙烯酰胺(HPAM)和梳形聚合物(KYPAM)两类具有代表性的聚合物为研究对象,对其驱油过程进行了室内实验模拟,分析不同相对分子质量HPAM和KYPAM的黏弹性、毛管数对原油驱采效率及残余油饱和度的影响规律,对比分析不同质量浓度条件下HPAM和KYPAM溶液在驱采过程中其自身黏度、幂律指数及黏弹性等参数的变化规律,结合实验结果剖析驱采过程中不同流体的微观作用机理。结果表明:驱油效率与毛管数成正相关,前者随后者的增加而增加;可以通过适当增加毛管数,或者提高聚合物溶液弹性以提高驱油效率;梳形聚合物具有较高的黏度和较低的弹性,在毛管数一致的情况下,其驱油效率的数值较低;驱油效率受聚合物溶液的弹性微观力主导,与黏度无关。
Two representative polymers,polyacrylamide(HPAM)and comb polymer(KYPAM),were used as the research objects.Laboratory experiments were conducted to simulate the oil displacement process.The influence rules of the viscoelasticity of HPAM and KYPAM with different relative molecular mass,capillary on crude oil flooding recovery efficiency and residual oil saturation were compared and analyzed.The changes of viscosity,power law index and viscoelasticity of HPAM and KYPAM solutions during different flooding conditions were compared.The microscopic mechanism of different fluids during the flooding process was dissected.The experimental results showed that the oil displacement efficiency was positively correlated with the number of capillaries,the former increased with the increase of the latter;the oil displacement efficiency was increased by appropriately increasing the number of capillaries,or increasing the elasticity of the polymer solution;the comb polymer had higher viscosity and lower elasticity,when the number of capillaries was the same,the value of the oil displacement efficiency was lower;the oil displacement efficiency was dominated by the elastic microscopic force of the polymer solution,and had nothing to do with the viscosity.
作者
高兴军
李源流
李志强
谷潇雨
何延龙
景成
GAO Xing-jun;LI Yuan-liu;LI Zhi-qiang;GU Xiao-yu;HE Yan-long;JING Cheng(Hengshan Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Yulin 719000,China;Xi'an Shiyou University,Xi’an 710065,China)
出处
《当代化工》
CAS
2021年第4期828-831,共4页
Contemporary Chemical Industry
基金
陕西省自然科学基础研究计划项目,低频人工地震波激励特低渗油藏渗吸排油规律与机理研究(项目编号:2020JQ-787)
陕西省自然科学基础研究计划项目,智能示踪剂测水平井产液剖面物理模拟及其解释方法研究(项目编号:2019JQ-287)
陕西省教育厅科研计划项目,致密砂岩三维孔隙内低频波动激励剩余油渗吸运移机制研究(项目编号:20JK0829)
陕西省教育厅科研计划项目,低渗透油藏CO2驱内源微生物原位靶向封窜机制研究(项目编号:20JS119)。
关键词
聚丙烯酰胺
梳形聚合物
黏弹性
驱油机理
微观作用
Polyacrylamide
Comb polymer
Viscoelasticity
Oil displacement mechanism
Microscopic effect
