疏水缔合聚合物渗流特性及其影响因素  

SEEPAGE CHARACTERISTICS AND ITS INFLUENCING FACTORS OF HYDROPHOBIC ASSOCIATING POLYMER

作　　者：马先平[1] 卢祥国[2] 张德富[2] 谢坤[2] 姜晓磊[2] 

机构地区：[1]中国石油大港油田公司采油工艺研究院,天津300280 [2]东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆163318

出　　处：《大庆石油地质与开发》2015年第3期102-107,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油大港油田公司重点科技攻关课题"孔南地区高凝高黏油藏化学驱最佳流度界限实验研究"(DGYT-2014-JS-306);黑龙江省自然科学基金重点项目"抗盐型聚合物缔合程度及其油藏适应性研究"(ZD201312)

摘　　要：为深入探索疏水缔合聚合物驱油机理,开展了疏水缔合聚合物溶液渗流特性及其影响凶素研究。结果表明:疏水缔合聚合物分子链上含有少量疏水基团,它们在溶剂水中可以发生缔合作用,形成胶束纳米结构——超分子网络结构,进而拥有独特渗流特性;疏水缔合聚合物溶液通过岩心孔隙时会受到剪切作用,造成聚合物分子链断裂即分子聚集体破损,其破损程度与注液速度、岩心孔喉尺寸、矿物组成和分子聚集体尺寸有关;聚合物分子聚集体尺寸大小影响着聚合物滞留量,并最终决定了注入压力、阻力系数和残余阻力系数大小;因为β-环糊精具有抑制疏水基团间的缔合和减小聚合物分子线团尺寸D_h功效,所以β-环糊精宏观上可以扩大疏水缔合聚合物溶液波及体积,微观上可以减小不可及孔隙体积,进而改善聚驱增油降水效果。In order to further explore the oil flooding mechanism of hydrophobic associating polymer,the seepage characteristics and its influencing factors of the hydrophobic associating polymer solution are carried out.The results show that for the polymer,there exist a small amount of hydrophobic groups on the molecular chains of the hydrophobic associating polymer and the group association can takes place in the solvent water,and then the micellar nanostructure-supermolecular network structure is formed,thus the unique seepage characteristics are presented;the polymer molecular chains are ruptured i.e.the polymer molecular aggregation gets damaged when the hydrophobic associating polymer solution flows through the core and is influenced by the shearing action,the damage degree is related to the injection rate,core pore-throat size,mineral compositions and molecular aggregation sizes;besides,the polymer molecular aggregation sizes greatly influence the polymer retention volume and eventually determine the injection pressure,resistance coefficient and residual resistance coefficient;β-CD can restrain the association between the hydrophobic groups and decrease the size of the polymer molecule clew Dh,therefore it can macroscopically expand the swept volume of the hydrophobic associating polymer solution and microscopically reduce IPV,thus the effects of enhancing oil production and reducing the water cut can be improved for the polymer flooding.

关 键 词：疏水缔合聚合物 分子聚集体 剪切作用 渗流特性 影响因素 机理分析 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]