氧化/ 交联双重改性淀粉冻胶

Oxidized/crosslinking double-modified starch gel

程立 陈瞰瞰 张慢来 刘德基 廖锐全 谷溢

CHENG Li CHEN Kankan ZHANG Manlai LIU Deji LIAO Ruiquan ZHENG Lihui GU Yi

长江大学石油工程学院，湖北武汉　430100 油气钻井技术国家工程实验室防漏堵漏技术研究室，湖北武汉　430100 中国石油吐哈油田分公司工程技术研究院，新疆鄯善　838202 中国石油华北油田公司，河北任丘　062552

Petroleum Engineering College of Yangtze University, Wuhan 430100 China Lost Circulation Control Technology Research Office, Oil and Gas Drilling Technology National Engineering Laboratory, Wuhan 430100, China Engineering and Technology Research Institute of Tuha Oilfield Company, CNPC, Shanshan 838202, China Huabei Oilfield Company, CNPC, Renqiu 062552, China

鉴于目前不压井作业中存在的诸多问题，利用改性淀粉冻胶的优越性，结合实际生产要求，研究了一种新型冻胶材料。室内实验表明，引发剂浓度、丙烯酰胺与淀粉投料比、反应温度、体系pH 值等因素影响改性淀粉冻胶成胶时间和胶体黏度。优化出氧化/ 交联改性淀粉冻胶质量比配方为3.6% 淀粉+0.03% 过硫酸铵+14.5% 丙烯酰胺+7.3% 交联剂A+4.7% 交联剂B。冻胶在pH 值8~12 范围内，成胶时间在1 h 内可控调节。室内评价冻胶适用温度60~120 ℃，黏度可高于200×104 mPa·s。

In view of the many troubles in the present snubbing services, a new type of gel material was developed using the merit of modified starch gel and in combination with the actual need. Lab experiments show that the initiator concentration, charge ratio of acrylamide and starch, reacting temperature and pH of the system affect the gelation time of modified starch gel and gel viscosity. The optimized mass ratio formula of oxidized/crosslinking modified starch gel is 3.6% starch, 0.03% ammonium persulfate, 14.5% acrylamide, 7.3% crosslinker A and 4.7% crosslinker B. When pH of the gel is within 8 to 12, the gelation time is adjustable within an hour. Lab evaluation shows that the applicable temperatures for the gel are 60℃ to 120℃ and its viscosity may be higher than 200×104 mPa·s.

10.13639/j.odpt.2015.03.024