封汽窜用栲胶冻胶研制及其流变性能研究  

Preparation and rheological properties of tannin extract gel for sealing steam channeling

作　　者：刘明嘉 葛际江[1] 王亮亮 周文超 孙君 林辉 孙艳萍 LIU Mingjia;GE Jijiang;WANG Liangliang;ZHOU Wenchao;SUN Jun;LIN Hui;SUN Yanping(School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China;Engineering Technology Branch of CNOOC Energy Development Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《断块油气田》2024年第3期553-560,共8页Fault-Block Oil & Gas Field

摘　　要：海上稠油油藏地层温度低,蒸汽驱开采期间容易发生汽窜。文中使用6%杨梅栲胶、0.2%乌洛托品、3%黏土制成的栲胶冻胶在55℃的低温下成胶时间可控,300℃热处理后强度高,热处理一个月后脱水率小于5%。流变实验分析表明,在几乎不增加成胶液黏度的情况下,黏土的加入显著增强了栲胶成胶液的触变性、成胶后冻胶的强度。此外,黏土强化形成的栲胶冻胶在较大应变剪切下可以保持冻胶结构的稳定性。使用Cryo-SEM对冻胶分析结果表明,微米级黏土颗粒的加入可以与栲胶分子的多活性羟基形成多基团交联的多重网络结构,使得冻胶锁水能力增强,微观上是冻胶高温下稳定性增加的原因。实验结果表明,由黏土颗粒强化形成的栲胶冻胶强度高、热稳定性好,适用于低温油藏蒸汽驱过程中封堵汽窜的实际需求。The formation temperature of offshore heavy oil reservoir is low and steam channeling frequently occurs during steam flooding.In this paper,the tannin extract gel formed by using 6%bayberry tannin extract,0.2%urotropine and 3%clay has a controllable glue formation time at 55℃,high strength after heat treatment at 300℃,and dehydration rate of less than 5%after one month of heat treatment.Rheological analysis showed that the thixotropy of the extract and the strength of the extract after gelling were significantly enhanced by adding clay without increasing the viscosity of the extract.In addition,the tannin extract gels strengthened by clay can maintain the stability of the gel structure under large strain shear.The results of Cryo-SEM analysis of gels showed that the addition of micron clay particles could form multi-group cross-linked multi-network structures with the active hydroxyl of tannin extract molecules,which enhanced the water-locking ability of the gels,and is the reason for the increased stability of gels at high temperatures microscopically.The above experimental results showed that the tannin extract gel formed by strengthening clay particles have high strength and good thermal stability,which is suitable for the actual demand of steam channeling in the process of steam flooding in low-temperature reservoirs.

关 键 词：海上稠油油藏 蒸汽汽窜 栲胶冻胶 流变性能 低温成胶 热稳定性 

分 类 号：TE357[石油与天然气工程—油气田开发工程]