为满足不压井作业对冻胶新材料的性能要求，对羧甲基纤维素凝胶合成进行了系统性的分析研究，制备出一种高强度、抗剪切、能够实现自破胶且破胶时间可控的改性羧甲基纤维素（CMC）智能胶体。该胶体的最优质量分数分别为：水79.41%，CMC 1%，丙烯酰胺8%，NaCl 0.5%，固化剂0.45%，过硫酸铵0.02%，有机交联剂0.02%，自制破胶剂10%，增黏剂0.6%。胶体最大本体强度可达44.5 N，最佳成胶温度范围为70~80℃，加入自制胶囊破胶剂后可实现38~70 h胶体的可控破胶，破胶残液为深棕黄色液体，利于返排。

In order to satisfy the requirements on the performance of the new material of gel used in snubbing service,the modified carboxymethyl cellulose (CMC) intelligent gel with high strength,shearing resistance and ability of self gel breaking in controllable breaking time is developed after studying systemically the synthesis of CMC gel.The optimal mass fractions in the prepared gel are as follows:water 79.41%,CMC 1%,acrylamide 8%,NaCl 0.5%,curing agent 0.45%,ammonium persulfate 0.02%,organic crosslinking agent 0.02%,self-made gel breaking agent 10% and tackifier 0.6%.The experimental results show that the maximum bulk strength of this gel can reach 44.5 N,and the optimal gelling temperature is in the range of 70-80℃.This gel can be broken in controllable breaking time ranging from 38-70 h by adding self-made micro-capsule gel breaking agent.This gel breaks into brown liquid,which is easy to flow back.

李振(1987-),男,博士,从事新型凝胶材料封堵体系研究,lizhen19870620@sina.com