缔合聚合物溶液的粘弹性实验研究

在模拟大庆主力油藏条件下，研究了浓度和矿化度变化过程中缔合聚合物溶液的动态粘弹性，结果表明：浓度和矿化度对其溶液粘弹性的影响与对HPAM溶液的影响相同；HPAM溶液的粘弹性是由分子链间的缠结作用引起的，而缔合聚合物溶液的粘弹性主要是由分子链间的缔合作用引起的，因此缔合聚合物溶液在比较低的浓度下就表现出了明显的弹性；在低而宽的频率范围内，缔合聚合物溶液的弹性明显大于HPAM溶液的弹性，说明缔合聚合物溶液在多孔介质中流动时，在比较小的剪切速率下就表现出弹性。这就意味着不需要很高的注入速度，就可以达到利用缔合聚合物溶液的弹性来提高驱油效率的目的。

EXPERIMENT STUDY ON VISCOELASTICITY OF ASSOCIATIVE POLYMER SOLUTIONS

In order to study on viscoelasticity of associative polymer solution(APS) in actual reservoir, the viscoelasticity of APS has been studied when concentration and salinity vary in Daqing main reservoirs temperature and formation water salinity of oil field. The results show: the influence of concentration and salinity on the viscoelasticity of APS is the same as on HPAM solution; The viscoelasticity of HPAM solution is resulted from tangle between molecular chains, while the viscoelasticity of APS is mainly caused by the associating action between molecular chains, therefore APS shows obvious elasticity in lower concentration; In low and wide frequency scope, the elasticity of APS is larger than the one of HPAM solution obviously, which explains that APS will show obvious elasticity in lower shear velocity when APS flows in porous media, which signifies that the purpose may be achieved by using polymer solution′s elasticity to enhance displacement efficiency in not very high injecting rate. 