聚合物吸附滞留规律及性能变化研究

Study of Polymer’s Adsorption and Retention Law and Performance Change

关键词:  聚合物驱  采收率  密闭取芯  吸附滞留  聚合物性能

Key words:  post polymer flooding  enhanced oil recovery  sealing core drill  adsorption retention  polymer performance

摘要:

建立了密闭取芯井岩芯中微量聚合物的分离及浓度、相对分子质量和水解度的测试方法;利用建立的方法研究了地层中残留聚合物的性能变化,分析了聚合物在聚驱后油层中平面、层内及层间的吸附滞留规律,研究了聚合物吸附滞留量与剩余油饱和度的关系;并利用红外光谱、扫描电镜等方法研究了地层中残留聚合物的结构和形态变化。研究发现:聚驱后聚合物的性能发生了较大变化,水解度增加约50%左右,相对分子质量约为原始聚丙烯酰胺的1/10,其主要成分仍为聚丙烯酰胺,主要以絮状集聚的形式存在于地层中;聚驱后聚合物在平面上普遍存在吸附滞留,且剩余油富集的地方吸附滞留量较低。

Abstract:

Establish the test method of the separation and concentration,molecular weight and degree of hydrolysis of micro-polymer in core of sealing core well,studied the performance alternation of residual polymer in formation,and analyzed the law of adsorption and retention of polymer in flat,intra-formation and interlamination of oil layer after polymer flooding,and studied the relation of polymer’s adsorption-retention amount and remaining oil saturation,as well as the structure and form of the residual polymer in oil layer by infrared spectrum and SEM.It is found that the performance of polymer has changed greatly after polymer flooding,the degree of hydrolysis has increased to 50% or so,the molecular weight has reduced to about 1/10 of original injected HPAM;but the main composition is still HPAM,it exists in the oil layer by the form of flocculated aggregate;the adsorption and retention of polymer is common in flat after polymer flooding,and the amount of absorption and retention is low in residual oil abundance zone.