化学驱产出污水回注技术在渤海石油能源开发中的研究与意义

Technical Research of Reinjection of Chemical Flooding Generated Sewage for Petroleum Energy Exploitation in Bohai Sea

针对渤海化学驱油田产出水特点,开展产出含聚污水配制聚合物并回注地层的再利用技术研究,研究结果表明:污水中的残留聚合物、悬浮物和乳化油对储层的渗透率具有一定的影响;在污水水质的控制指标为残留聚合物≤600 mg/L、乳化油≤50 mg/L、悬浮物≤25 mg/L时,污水配成的2,000 mg/L聚合物溶液的阻力系数值为5.61,残余阻力系数为2.27,说明聚合物溶液发挥了扩大波体积的作用,对于减轻产出化学驱液处理压力,突破海上油田化学驱的产出液处理技术瓶颈,最大限度减少含油污水的危害性,实现废弃资源的再利用,具有重要意义。

In view of the characteristics of chemical flooding generated wastewater in Bohai Sea oilfields,a technical study of both polymer preparation and reinjection of polymer-bearing wastewater was carried out. The research results indicate that residual polymer,suspended solids and emulsified oil in the wastewater have a certain impact on the permeability of the reservoir;when controlling indexes of the wastewater reached：residual polymer ≤600 mg/L, emulsified oil ≤50 mg/L and suspended solids ≤25 mg/L,the resistance coefficient value of the 2,000 mg/L prepared polymer solution was 5.61 and residual resistance factor was 2.27,indicating that the solution enlarges the swept volume and may help in the tackling of the technical bottleneck of output liquid treatment for offshore oilfield chemical flooding;it can minimize the hazards of oily sewage,realize the recycling of waste resources,save fresh resources and help in the promotion of sustainable development.