新型插层聚合物溶液性能及其作用机理研究

Performance and Mechanism Study on HPAM/Layered Silicate Nanocomposite Solutions

针对矿场实际需求,利用现代油藏工程理论、仪器检测分析和物理模拟方法,开展了插层聚合物溶液分子聚集态、增黏性、抗盐性、耐温性、稳定性、分子线团尺寸、流变性、黏弹性和流动特性实验研究,进行了性能特征及其影响机理的分析和探索。结果表明,插层聚合物聚集态主要以"层叠片状"为主,而"高分"聚合物聚集态呈长链立体网络结构。相对于普通聚合物而言,插层聚合物具有较好的耐温抗盐性和稳定性以及流变性和黏弹性。在流动特性实验中,相较于普通聚合物,插层聚合物溶液具有黏度小,但阻力系数和残余阻力系数较大的渗流特点,表现出了良好的液流转向能力。

Allowing for the actual demands of the oilfields, the performance of the viscosity, salt tolerance, temperature resistance, time stability, molecular coil dimension, molecular aggregation, rheological property, viscoelasticity and flow characteristics of the HPAM/layered silcated nanoeomposite （PLSN） solution was evaluated by modern reservoir engineering theory, equipment analysis and the physical simulation. The results showed that, the PI.SN had an excellent salt tolerance, temperature resistance and time stability compared to the common polymer including ＂salt tolerance＂ polymer and ＂high molecule weight＂ polymer. The aggregation of PLSN was mainly a ＂flaky-reticular＂ formation while the ＂high molecule weight＂ HPAM had an elongated chain reticular configuration. Furthermore, oil displacement eiticiency of PLSN would be higher than that of the common polymer because of its excellent viscoelasticity. Core flooding tests results indicated that, compared with common polymer, the PLSN material was characterized of lower viscosity and higher resistance factor and residual resistance factor, which ensured that the PLSN solution had a good fluid diverting role.