一种驱油用高稳定性多糖类聚合物的物理性能

Physical Properties Evaluation of a Stable Polysaccharide Polymer for Enhanced Oil Recovery

魏兵

WEI Bing

针对高温高盐油藏化学驱的技术需要，研究了一种新型多糖类聚合物SH-1 的物理性能，包括流变性、增稠效果、耐盐抗温性能、机械稳定性以及在多空介质中的流动性，并在此基础上评价了该聚合物在三次采油技术中的应用潜力。结果表明：SH-1 相对于相对分子质量800 万、水解度5%的部分水解聚丙烯酰胺（HPAM）具有更好的增稠效果，质量分数0.5%的HPAM溶液和质量分数0.1%的SH-1 溶液的黏度（25℃，10 s-1）基本相同，约为100mPa·s。随着盐度的增加，HPAM溶液的黏度明显降低；而SH-1 溶液的黏度基本不变，表现出良好的耐盐性。与HPAM溶液相比，SH-1 溶液黏度随温度升高而下降的幅度较小，表现出较好的耐温性能。在高剪切速率下SH-1溶液的黏度损失明显小于HPAM溶液，注入速度为20 mL/min时，HPAM溶液黏度损失达65%，而SH-1溶液的黏度损失仅为12%。同时，SH-1还具有较好的注入性和流动控制能力，由于分子链硬度大，SH-1在多孔介质中（130×10-3μm2左右）的滞留量大于HPAM。SH-1在高温高盐高渗透率油藏驱油方面具有应用潜力。图13表1参11

In order to satisfy the technical demands of high temperature and salinity reservoirs，the physical properties of a novel polysaccharide polymer（SH-1），including rheology，thickening ability，salinity and thermal tolerance，and flow behavior in porous media，were systematically investigated，and the potential of the SH-1 in enhanced oil recovery（EOR）was evaluated. The experimental results indicated that SH-1 had a superior thickening power compared to polyacrylamide（HPAM）with the relative molecular weight of 8000×104 and hydrolysis degree of 5%，the viscosity of 0.1% SH-1 solution was as much as that of 0.5% HPAM solution，being approximately 100 mPa·s（25℃，10 s-1）. With the salinity increasing，the viscosity of 0.5% HPAM solution significantly decreased；while it was negligible for 0.1% SH-1 solution，suggesting that the SH-1 had the advanced salt tolerance. With the increase of the temperature，the viscosity of HPAM solution was found to steeply drop，on the contrary，a very slow declining was observed for SH-1 solution，proving its good thermal stability. Under high shear rate，the viscosity loss of SH-1 solution was noticeably smaller than that of HPAM solution，at the shear rate of 20 mL/min，the viscosity loss of HPAM solution was 65%，while in the case of SH-1 this value was only 12%. Meanwhile，the appropriate injectivity and mobility control capability were also confirmed. However，the magnitude of polymer retention of SH-1 was higher than that of HPAM due to the rigidity of polysaccharide polymer chain. It is supposed that SH-1 is very promising for high permeability reservoirs with high temperature and high salinity.

10.19346./j.cnki.1000-4092.2017.01.022