基于形状记忆聚合物的温敏型堵漏材料制备与评价

Preparation and Evaluation of Thermosensitive Plugging Materials Based on Shape Memory Polymers

传统堵漏材料对裂缝性漏失的封堵存在不足,针对该问题,将形状记忆聚合物材料引入封堵作业,利用其“温控形变”特性,制备出温敏型堵漏材料;采用热机械动力分析仪和形状恢复试验,评价了其玻璃态转变温度和形状记忆性能;通过裂缝封堵模拟试验,评价了温敏型堵漏材料的裂缝封堵效果,并探索了其裂缝封堵机理。研究结果表明:温敏型堵漏材料的形变温度(即玻璃态转变温度)可根据漏失层段位置需求在温度80~120℃范围内进行调控,形状记忆性能优异(形状恢复率大于95%),且耐温性能良好,初始热解温度230~258℃,可适用于温度80~120℃的地层,与传统堵漏材料复配后可封堵3~5 mm裂缝。研究结果可为研制和应用新型材料封堵裂缝提供参考。

Considering the insufficient ability of traditional plugging materials to seal fractured leakage,shape memory polymers(SMPs)were introduced for plugging.A thermosensitive plugging material was prepared based on SMPs for their“temperature-controlled deformation”property.Then,its glass transition temperature and shape memory performance were evaluated by the thermo-mechanical dynamic analyzer and shape recovery test.Moreover,the simulation tests of fracture plugging were carried out to assess the plugging capability of the polymers on fractures and explore the plugging mechanism.The research results indicated that the deformation temperature(glass transition temperature)of the thermosensitive plugging material could be regulated in the range of 80-120℃according to the locations of the leakage layers,featuring excellent shape memorizing performance(with a shape recovery ratio of more than 95%).In addition,the temperature resistance of this material was good,with the initial pyrolysis temperature between 230 and 258℃,which meant that the material could be applied in a formation temperature environment of 80-120℃.The compound of this material and the traditional plugging material could successfully seal the fractures with width ranging from 3-5 mm.The research results can provide a reference for the preparation and application of this new material to fracture plugging.