适用于含聚回注水的疏水缔合聚合物的综合性能

Comprehensive Performance Evaluation of Associated Polymers Suitable for Reinjection Water Containing Polymer

新疆油田化学驱采用高矿化度含聚回注水作为注入水。研究了含聚回注水配制的普通聚合物HPAM和疏水缔合聚合物KYPAM的增黏性、流变性、黏弹性、长期稳定性、不可及孔隙体积(IPV)和驱油性能。研究结果表明:KYPAM具有特殊的空间网状结构,在含聚污水中具有更好的增黏性、流变性、黏弹性;在含聚回注水中KYPAM的抗老化能力好于HPAM,经过90 d的老化后,质量浓度1500 mg/L的KYPAM溶液的黏度保留率为81.4%,而HPAM溶液的只有40.2%;在渗透率150×10^-3μm^2左右岩心中,质量浓度为1500 mg/L的KYPAM溶液的IPV为19.6%,而HPAM溶液的IPV为22.1%,KYPAM启动相对小孔喉的能力比HPAM高;在渗透率150×10^-3μm^2左右的人造砾岩岩心中,水驱后注入0.5 PV的浓度为1200、1500 mg/L的聚合物溶液,KYPAM的驱油效率比HPAM的高2%数3%。

High salinity polymer-bearing reinjection water is used as injection water for chemical flooding in Xinjiang oilfield. The comprehensive performance of HPAM and hydrophobic associating polymer KYPAM prepared with polymer-containing reinjection water,including viscosity,rheology,viscoelasticity,long-term stability,inaccessible pore volume(IPV)and oil displacement performance,were evaluated. The results showed that KYPAM had better viscous,rheological and viscoelastic properties due to its special network structure. The anti-aging ability of KYPAM was better than that of HPAM. After aging for 90 days,the viscosity retention rate of KYPAM solution with the concentration of 1500 mg/L was 81.4%,while that of HPAM solution was only 40.2%.In the core permeability of 150×10^-3μm^2,the IPV of 1500 mg/L KYPAM solution was 19.6%,while the IPV of HPAM solution was 22.1%. Compared with HPAM,KYPAM had a higher ability of starting relative pore-throat. In the core permeability of 150×10^-3μm^2,when 0.5 PV of polymer solution with the concentration of 1200-1500 mg/L was injected after water flooding,the oil displacement efficiency of KYPAM solution was 2%-3% higher than that of HPAM solution.