新型耐温耐盐微生物多糖性能及驱油能力  

Evaluation of the characterization and oil displacement ability of a new type of temperature-and salt-tolerant microbial polysaccharide

作　　者：刘涛[1] 胡婧[1] 李彩风[1] 岳胜辉[1] 宋永亭[1] 汪卫东[1] 曹功泽[1] 束青林[1] LIU Tao;HU Jing;LI Caifeng;YUE Shenghui;SONG Yongting;WANG Weidong;CAO Gongze;SHU Qinglin(Microbial Oil Recovery Research Institute,Research Institute of Petroleum Engineering,Shengli Oilfield Company,Sinopec,Dongying 257000,China)

机构地区：[1]中国石化胜利油田分公司石油工程技术研究院微生物采油研究所,东营257000

出　　处：《应用与环境生物学报》2024年第4期686-692,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国家重点研发计划项目(2022YFC2105200);中石化创新创意项目(P23029)资助。

摘　　要：高温高盐油藏水驱过程中平面和纵向非均质性加剧,导致水淹水窜,注水利用率低,现有的聚合物体系不能完全满足开发需求.研究发酵得到了新型耐温耐盐微生物多糖,利用不同方法解析明确微生物多糖的结构特征,确定为一种新型微生物多糖.该微生物多糖在高温90℃、高盐50000 mg/L条件下放置60 d后保持了高的黏弹特性,能够满足高温高盐油藏的需求.不同渗透率胶结岩心注入性表明微生物多糖在渗透率>300×10^(-3)μm^(2)的岩心不同位点均能有效建立驱替压差,微生物多糖能够有效运移到油藏深部,扩大在油藏中的波及范围;岩心驱油试验表明在空白岩心的基础上提高驱替效率13.2%,含水最大降幅18.4%.本研究得到的微生物多糖体系为高温高盐油藏提高采收率提供了一条可行的技术途径.(图12表6参30)To address the problem of increased planar and vertical heterogeneity during water flooding in hightemperature and high-salinity reservoirs,which leads to water breakthrough and low water injection utilization,the existing polymer system cannot fully meet development needs.In this study,a new type of temperatureand salt-tolerant microbial polysaccharide was obtained via fermentation.The structural characteristics of microbial polysaccharides were analyzed and clarified using different methods.The microbial polysaccharide maintained high viscoelasticity after being stored at high temperature of 90℃ and high salt concentration of 50000 mg/L for 60 days,demonstrating its suitability for high temperature and high salinity reservoirs.Through the displacement experiments by cemented cores with different permeabilities,it is confirmed that the polysaccharide can establish the displacement pressure difference at different sites of the core with permeability>300×10^(-3)μm^(2),migrate to the deep part of the cores and expand the sweep range.The physical displacement experiments improved the displacement efficiency by 13.2% on the basis of blank experiment,with a maximum decrease of 18.4%in water cut.In conclusion,the microbial polysaccharides developed in this study provide a feasible technical solution for improving oil recovery from high-temperature,high-salinity reservoirs.

关 键 词：高温高盐油藏 微生物多糖 黏弹性 运移 驱替效率 

分 类 号：TE39[石油与天然气工程—油气田开发工程]