Abstract: According to the characteristics of physical reservoir properties of the Shuanghe Ⅶ13layer series, such as high formation temperature(96.5 ℃) and low permeability, heatresistant polymer with molecular weight of 2 200×104 which was produced by Henan oilfield was selected to study characterization of polymer and oil displacement efficiency. The degree of hydrolysis，solution viscosity and first normal stress difference were measured at 95 ℃. And core flooding experiments were conducted to evaluate whether heatresistant polymer had good application. The results showed that the hydrolytic degree of heatresistant polymer was increased faster at the early aging, while the growth rate was slowed when the hydrolytic degree reached a certain level and kept the longterm stability in 60 days. The solution viscosity experienced three process in 90 days: first decreased then increased, finally decreased slowly. The viscosity retention ratio was maintained above 80% and the higher the concentration of solution, the better retention ratio. The first normal stress difference also experienced the same process as solution viscosity and retention ratio was maintained above 49%.It illustrated this polymer had good elastic retention ability. The oil displacement experiment showed that the oil flooding efficency was above 24% when injection concentration was 2 000 mg/L and the slug size was 0.5 PV.

Key words: Heatresistant,    ,  Hydrolytic degree,    ,  Aging time,    ,  First normal stress difference,    , Oil displacement efficiency

摘要： 双河油田Ⅶ1 - 3层系为高温( 9 6. 5℃) 低渗油藏, 针对这一特点选用河南油田生产相对分子质量为 22 0 0×1 0 4 耐高温聚合物进行聚合物特性及驱油效果研究。实验测定该耐高温聚合物溶液在9 5℃不同老化时间 下水解度、 黏度和第一法向应力差的变化规律, 并进行岩心驱油性能评价实验, 研究该耐高温聚合物是否具有良好 的应用性。结果表明, 该耐高温聚合物老化初期水解度增长较快, 当水解度达到一定程度时增长速度变缓, 在6 0d 左右趋于平稳; 耐高温聚合物黏度在9 0d过程中会经历下降、 上升及缓慢下降3个过程, 但9 0d老化时间下黏度保 留率均在8 0%以上, 且质量浓度越高黏度保留率越好; 第一法向应力差同样经历下降、 上升及缓慢下降3个过程, 保 留率均在4 9%以上, 说明该聚合物在高温老化下具有良好的弹性保留能力。岩心驱油实验表明, 当注入聚合物质量 浓度为20 0 0m g / L, 段塞尺为0. 5P V时, 化学驱驱油效率在2 4%以上, 驱油效果良好。

关键词: 耐高温,    ,  水解度,    ,  , 老化时间,    ,  , 第一法向应力差,   ,  , 驱油效果