渗漏封堵材料在石油和天然气的开采、长距离输运、储存都有重要应用。智能型封堵材料可通过微米尺度狭缝处产生的环境变化,实现对狭缝位点的识别、聚集,并通过自身的堆积和交联实现对渗漏点的有效封堵。以密度适宜的CaCO3做内核,外层包覆功能化的有机材料制备了pH响应型复合堵漏剂,并对其封堵性能进行了测试。结果表明:粒径不同的复合堵漏剂在裂纹渗漏位点堆积,在pH升高的情况下,微粒之间交联形成具有一定机械强度的封堵材料,可承受20MPa以上的压强差。
Leakage plugging materials have important applications in oil and gas exploitation,long-distance transportation and storage.Intelligent plugging materials can realize the identification and aggregation of slit sites through the environmental changes generated at the micron scale slit,and then accomplishes the effective plugging of leakage points through its own accumulation and cross linking.The CaCO3 with appropriate density as the core and coated with the outer layer with functional organic materials,the intelligent response of pH value change can be achieved.The results shown that the particles with different sizes accumulated at the crack leakage site.When the pH value increased,the cross linking between the particles formed a solid plugging materials with certain mechanical strength,which can withstand the pressure higher than 20MPa.
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基金资助
国家科技重大专项(2016ZX05017-003)
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