Solution Characteristics and Oil Displacement Efficiency of an Ultrahigh Molecular Weight Association Polymer
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摘要: 为了提高胜利油田高温高含盐Ⅲ类油藏的聚合物驱效果,开展了耐温抗盐超高分子缔合聚合物AP-P5溶液的特性及驱油效果研究.在温度为85 ℃、地层水矿化度为32 868 mg/L的Ⅲ类油藏条件下,对AP-P5的基本物化性能进行了评价,测试了AP-P5溶液的黏度-浓度曲线,用光散射仪测定了AP-P5溶液的流体力学半径分布,并通过混合聚合物和石英砂,研究了溶液的吸附性,最后利用岩心物理模拟试验研究了AP-P5的注入渗流特性和驱油效果;在胜利油田坨28区块进行了现场试验,分析了AP-P5溶液的注入曲线和注入后该区块的生产曲线.试验发现,AP-P5与普通缔合聚合物DH3相比,相对分子质量高一倍,缔合单体含量低58%,无明显的临界缔合浓度,流体力学半径更小,吸附量小30%,注入压力低50%,采收率提高率高3.9百分点;不过,现场试验还在继续,目前尚无明显的降水增油效果.研究表明,AP-P5溶液特性优良,在地层中比普通缔合聚合物更容易形成活塞式推进,驱油效果更好.Abstract: In order to improve the polymer flooding effect in high-temperature and high-salt Class III reservoirs in the Shengli Oilfield, the solution characteristics and oil displacement effect of a temperature and salt-resisting ultrahigh molecular association polymer AP-P5 are studied. Basic physicochemical properties of AP-P5 are evaluated under Class III reservoirs at 85 degrees and salinity of 32 868 mg/L. The viscosity at varied concentrations is examined, the hydrodynamic radius distribution of the solution is determined and the adsorption is studied through mixed polymer solution and quartz sand. Finally, the injection and seepage characteristics and oil displacement effect are investigated through physical experiments. A field test is carried out in the Tuo 28 Block of Shengli Oilfield to analyze the injection of AP-P5 solution and production after injection. The results show that AP-P5 possesses double molecular weight, smaller hydrodynamic radius and no significant critical associating concentration comparing with ordinary associating polymer DH3. Moreover, it is lower by 58% in the associated monomer weight, 30% in adsorption capacity and 50% in injection pressure and higher by 3.9% in the recovery rate. More field tests are ongoing but it has not shown water reduction and production increasing effect. The research reveals that AP-P5 has good solution properties and it is easier to generate a piston-like movement with it than DH3 in formations;further, it has higher displacement efficiency.
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