长6油层疏水缔合聚合物调剖体系研究

Research of Hydrophobic Associating Polymer for Profile Modification in Chang-6 Subsection

疏水缔合聚合物是目前理想的抗温、抗盐和抗剪切且具有高效增粘性的新型聚合物。疏水缔合聚合物调剖技术通过添加交联剂,使之与缔合聚合物形成三维网状结构体系,可控制成胶时间及强度,改善单纯聚合物体系存在的抗盐性、耐温性、抗剪切性差的问题。本文结合镇泾油田长6油层注聚区块地层情况,通过粘度和浓度关系实验优选出了适于该区块的疏水缔和聚合物调剖体系。驱油实验进一步验证了该调剖体系具有很好的调剖性能,能显著提高油田的产油量或减缓油田的产量递减速度,改善油藏水驱效果。

At present,hydrophobically associating water-soluble polymer was a favourable polymer which was of heat-resistance,salt-resistance,shearing-resistance,and viscosifying.Associating polymer recitified section technique was through affix crosslinker to form three-dimensinal network construction with associating ploymer.That can control the time and strength of gel,and improve heat-resistance,salt-resistance,and shearing-resistance of pure polymer system.Based on the strata condition of chang-6 oil layer polgmer waterflooding block of Changqing Oilfield,the hydrophobically associating polymer recitified section system was optimized which was fit for the block by the experiment with the relation between viscosity and concentration,and the result was proved by oil displace experiment.The result indicated that the recitified section system can obvious raise crude output of oil field or palliation the production decline rate of oil field,and improve the effect of water drive in reservoir.