红岗油田复配聚合物溶液性能及作用机理

红岗113-3区块具有油藏厚度较大、平均渗透率较高和非均质性较严重等特征,比较适宜开展化学驱.针对油藏开发实际需求,利用仪器检测、物理模拟和理论分析方法,开展了对“复配”聚合物和“高分”聚合物增黏性、抗剪切性、耐温抗盐性、稳定性、分子线团尺寸分布、流变性和黏弹性等实验研究.结果表明,与相同条件下的“高分”聚合物溶液相比较,“复配”聚合物溶液增黏性、抗盐性和抗剪切性较强,相对分子质量分布较宽,阻力系数和残余阻力系数较大,扩大波及体积能力较强,与油藏孔隙间适应性更好.因此,推荐吉林红岗油田化学驱采用“复配”聚合物,其质量组成“超高∶高分∶中分”等于17∶60∶23.

Study on Performance and Mechanism of Compound Polymer Flooding in Honggang Oilfield

Chemical flooding is suitable in Block 113-3 of Honggang Oilfield because the reservoirs in this field are characterized by thick layers, high average permeability and the serious interlayer heterogeneity. To meet the actual requirments for development of Block 113-3 of Honggang Oilfield, a series of experiments have been conducted to evaluate the viscosifying, salt tolerance, tempera- ture and shear resistance, stability, theological property and viscoelasticity characteristics of the compound polymers and common polymers. The study results indicated that comparing with the common polymer, the compound polymers are better in propreties of the viscosifying, salt tolerance, temperature and shear resistance, and the the distribution of the relative molecular mass is also wider. The compound polymers are better in compatibility with the reservoirs because the resistance factor and residual resistance factor are larger, and swept volume is also larger. Therefore, it is recommendated that compound polymer flooding should be used in Block 113-3 of Honggang Oilfield, and the optimizeding mass ratio of the compound polymer is 17 ： 60 ： 23 for ultrahigh molecule, macromolecule and medium molecule polymers.