聚丙烯酰胺凝胶高温稳定性研究

发布时间：2018-04-25 11:06

  本文选题：聚丙烯酰胺凝胶 + 稳定性　； 参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：随着采油不断加深,温度与地层水的矿化度也在不断增大,各大油田将高温高盐油藏作为开采重点。聚丙烯酰胺凝胶由于自身分子结构和成分的原因,在高温条件下长期使用会发生严重老化,从而引起粘度和吸附量降低,导致堵剂效果不理想,无法满足现场应用要求。为解决聚丙烯酰胺凝胶在高温高盐油藏的应用难题,弥补现有研究中的不足之处,本论文开展了聚丙烯酰胺凝胶的高温稳定性研究,为丰富和发展聚丙烯酰胺凝胶的高温老化机理,研制和开发抗高温聚丙烯酰胺聚合物,提供重要的理论基础与有效的解决对策。本论文首先以丙烯酰胺单体为原料,以过硫酸铵为引发剂,以N,N'-亚甲基双丙烯酰胺(BIS)为交联剂,分别制备出线性聚丙烯酰胺和交联聚丙烯酰胺凝胶。将得到的凝胶在150℃下老化12 h后通过红外、核磁分析其结构变化特征,从而解析线性聚丙烯酰胺和交联键的结构变化特征;其次,将BIS交联的聚丙烯酰胺凝胶在150℃下老化12 h后,利用X射线能谱(EDS)和X射线光电子能谱(XPS)分析分子结构变化特征,结合波谱分析结果研究BIS交联聚丙烯酰胺凝胶的高温老化机理;再次,基于聚丙烯酰胺凝胶高温老化机理的研究,在分子结构设计、添加抑制剂等方面提出对策,来提高聚丙烯酰胺凝胶的高温稳定性,并通过具体实验评价所提出对策的效果;最后为评价PBIS交联聚丙烯酰胺凝胶应用价值的大小,通过质构仪分析两种凝胶老化前后的强度与韧度变化情况,通过岩心模拟实验对两种凝胶的封堵率和剖面改善率进行评价,考察其应用效果。研究表明:1.交联聚丙烯酰胺凝胶150℃高温老化过程中会发生主链断裂、交联断裂和酰胺水解三个主要的结构变化特征。2.交联聚丙烯酰胺凝胶的主链断裂机理是热解氧化反应,交联断裂和侧链酰胺水解的机理是亲核取代反应。3.用六亚甲基四胺/对苯二酚(PBIS)代替N,N-亚甲基双丙烯酰胺(BIS)交联丙烯酰胺,对制得的聚丙烯酰胺凝胶进行高温老化实验,抗高温能力显著提高。4.PBIS交联聚丙烯酰胺凝胶在150℃老化前后的强度和韧度,封堵率以及剖面改善率,均优于BIS交联聚丙烯酰胺凝胶,具有较好的应用前景。
[Abstract]:With the deepening of oil production, the temperature and salinity of formation water are also increasing, and the oil reservoirs with high temperature and high salt are regarded as the key points of exploitation. Because of its molecular structure and composition, the polyacrylamide gel will be used for a long time under high temperature, which will cause serious aging, which will lead to the decrease of viscosity and adsorption capacity, resulting in unsatisfactory plugging effect, which can not meet the requirements of field application. In order to solve the problem of application of polyacrylamide gel in high temperature and high salt reservoirs and to make up for the shortcomings of the existing research, the high temperature stability of polyacrylamide gel was studied in this paper. In order to enrich and develop the high temperature aging mechanism of polyacrylamide gel and to develop the high temperature resistant polyacrylamide polymer, this paper provides an important theoretical basis and effective solutions. In this paper, linear polyacrylamide and cross-linked polyacrylamide gel were prepared by using acrylamide monomer as raw material, ammonium persulfate as initiator, and NNT-methylene bisacrylamide (BIS) as crosslinking agent, respectively. After aging at 150 鈩，

本文编号：1801054