分子膜增注剂的分子模拟、合成及性能评价

Molecular Simulation，Synthesis and Performance Evaluation of Molecular Membrane Injection Agent

渠慧敏 丁子峰 门海英 王宁 王鹏 韦良霞

QU Huimin DING Zifeng MEN Haiying WANG Ning WANG Peng WEI Liangxia

分子膜增注技术有效期取决于分子膜增注剂在储层岩石表面的吸附性能。为了延长分子膜增注技术有效期，采用分子力学与蒙特卡洛相结合的方法研究了不同阳离子化合物在岩石表面的吸附性能，根据分子模拟结果设计了烷基脂肪胺聚氧乙烯醚三季铵盐（AFATQA）作为新型分子膜增注剂，对其吸附和减阻性能进行了预测，对合成产物的结构进行了表征，通过室内实验评价了AFATQA的性能，并在胜利油田实施分子膜复合措施。分子模拟结果表明，单分子吸附能随单分子电荷密度和分子疏水链长的增加而增加，酰胺基团和羟基可以提高单分子吸附能；预测AFATQA在岩石表面的吸附能高（-155.51 kcal/mol），吸附后减阻效果明显；按照分子结构模型合成的AFATQA可以吸附在岩石表面，随AFATQA浓度增加，岩石表面电位和接触角增加、AFATQA防膨率增大；室内岩心驱替实验结果表明，AFATQA能有效降低注水压力，临37-34 井现场实施分子膜复合措施后降压增注效果明显，注水量增加，注水压力降低，对应油井产油量上升、含水量降低、动液面回升。图9 表4 参11

The effective period of molecular membrane injection technique depended on the molecular adsorption performance onto the surface of reservoir rock. In order to prolong the effective period of molecular membrane injection technique，the adsorption of some cationic compounds onto the rock surface was simulated by the method of molecular mechanics and Monte Carlo. According to the results of molecular simulation，the three quaternary ammonium of alkyl fatty amine polyoxyethylene ether（AFATQA）was designed as a new molecular film injection agent. Its adsorption energy and drag reduction effect were calculated. Then AFATQA was synthesized and the structure of synthetic product was characterized. Its comprehensive performance evaluation was carried out by laboratory experiments，and the molecular membrane composite measure was implemented in Shengli oilfield. Molecular simulation results showed that the single molecule adsorption energy increased with the increase of hydrophobic chain length or charge density. Acyl amine groups and hydroxyl could improve the single molecule adsorption energy. It simulated that AFATQA had a high adsorption energy（-155.51 kcal/mol）and a significantly drag reduction effect. The synthesized AFATQA based on the disigned model could adsorbed on the surface of rock. The Zeta potential and the contact angle increased on the surface of rock with increasing AFATQA concentration，AFATQA’s swelling rate also increased. The core flooding experiment results showed that AFATQA could effectively reduce the injection pressure. After the molecular film composite measure was applied in L37-34 well，the increasing injection effect was obvious. It showed that the water injection increased，the water injection pressure reduced，the corresponding oil production increased，water content decreased and the dynamic liquid level rose.

10.19346./j.cnki.1000-4092.2017.03.016