二乙烯三胺酚醛树脂凝胶调剖体系研制及应用

Development and Application of Diethylenetriamine Phenol Formaldehyde Resin Crosslinking Gel System for Profile Adjustment

水驱油藏进入中、高含水期后,通常需要开展调剖堵水作业来实现控水增油。调剖堵水所用的化学药剂体系性能对调剖堵水成功至关重要,文章针对常规调剖体系存在温度,矿化度的耐受能力弱、体系稳定性差、有效期短等不足,研制出一种新型的二乙烯三胺酚醛交联剂树脂凝胶调剖体系。该体系性能优异,成胶适用温度范围为60℃～120℃,可耐受钠离子浓度250 000 mg/L、钙离子5 000 mg/L及p H为5～10的地层环境。恒温箱中120 d后,70℃环境下凝胶黏度保留率约为98%以上,90℃～120℃环境下凝胶黏度保留率约为94. 7%以上。矿场试验结果表明,采用新型交联剂树脂凝胶调剖体系,井组日增油2. 0 t,累增油1 200 t,相比于常规酚醛树脂凝胶调剖体系具有更广阔的适用性和更大的经济价值。

With the water flooding reservoir in medium or high water cut stage,profile adjustment and water plugging measurement is crucial.The conventional profile adjustment system is limited by not sufficient temperature and salinity tolerance,poor stability and short valid period.A new type of diethylenetriamine phenol formaldehyde resin gel profile control system developed is introduced herein.The system’s performance is excellent,suitable for temperature range 60-120℃,sodium 250000 mg/L,calcium 5000 mg/L and pH >5 environment.After 120 days in constant temperature box,gel viscosity retention rate is above 98%at 70℃,and gel viscosity retention rate is more than 94.7%in 90-120℃environment.The field tests prove the new resin gel has improved the daily oil rate by 2.0 t,1200 in total.Compared with the conventional phenol formaldehyde resin gel profile control system,the new one has better applicability and more economic value.