Study on a novel phenol-formaldehyde crosslinker for water shutoff and profile control

doi:10.16085/j.issn.1000-6613.2016-2180

Abstract

Abstract: Water-soluble,low polymerization degree phenolic resin crosslinker,synthesized by phenol and formaldehyde through a certain degree of reaction,has lower volatile and toxicity compared to conventional phenolic monomer crosslinking agent. Therefore,it is widely used in oil field water shut off Profile operation. However,this kind of crosslinking agent is easy to cure at room temperature that has greatly limited its application. In this paper,a novel phenolic crosslinking agent is prepared by molecular design. The cross-linking agent has excellent stability and can be stored for 60 days at 50℃. The gelation system can be prepared by using this crosslinking agent. The gelation strength is up to 20000mPa·s and the gelation temperature ranges from 60℃ to 120℃. It can tolerate 20000 mg/L of sodium ion,5000mg/L of calcium ion,and pH 5-9. The gel retention rate is around 75% after 60 days,and the blocking rate is about 94%. Compared with the conventional phenolic crosslinking agent it has a wider applicability.

Key words: crosslinking agent, synthesis, polymers, gels, blocking rate

摘要： 水溶性低聚合度酚醛树脂交联剂，因其将苯酚和甲醛进行一定程度的反应，与常规酚醛单体类交联剂相比，挥发性和毒性较低，因而被广泛应用于油田堵水调剖作业。但此类交联剂在室温下放置一段时间后极易出现固化情况，保存稳定性不足，严重影响交联剂的使用。针对这一不足，本文通过分子设计制备了一种新型酚醛类交联剂，该交联剂稳定性优异，50℃条件下可存贮60天左右。利用该交联剂制备凝胶体系，成胶黏度可达20000mPa·s，成胶适用温度范围为60~120℃，可耐受钠离子20000mg/L、钙离子5000mg/L及pH=5~9的地层环境，成胶60天后凝胶黏度保留率约为75%，封堵率94%左右。相比于常规酚醛类交联剂具有更广阔的适用性。

关键词: 交联剂, 合成, 聚合物, 凝胶, 封堵率

CLC Number:

TQ326.4

SUN Lei, XU Hongzhi, HAO Zhiwei, ZHANG Guiqing, XIA Ye, LIU Xiaopan, WANG Yubin. Study on a novel phenol-formaldehyde crosslinker for water shutoff and profile control[J]. Chemical Industry and Engineering Progress, 2017, 36(09): 3400-3406.

孙磊, 徐鸿志, 郝志伟, 张贵清, 夏烨, 刘小攀, 王宇宾. 一种新型堵水调剖用酚醛交联剂的研究[J]. 化工进展, 2017, 36(09): 3400-3406.

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