降低油田采出水配制聚合物溶液黏度损失的曝氧调控方法

发布时间：2018-05-04 01:25

本文选题：采出水 + 部分水解聚丙烯酰胺　；参考：《油田化学》2017年01期

【摘要】：在传统以混凝除油、过滤除杂为主要技术的处理工艺基础上,对采出水回注前进行曝氧处理以降低所配制聚合物溶液的黏度损失,已成为三次采油聚合物驱地面工程的一项重要工作。为建立科学的采出水曝氧程度评价方法,规范了采出水曝氧前、后水质溶氧量的普适性测试方法,研究了水质溶氧量和采出水曝氧后矿场配注流动工况对聚合物溶液黏度、抗剪切性和黏弹性的影响。研究结果表明,溶氧管比色法需根据采出水曝氧前后溶氧量的范围选择合适的测氧管,而电化学探头法在通用性和解析度方面更具优势,可优先选择;随着采出水曝氧程度的增加,聚合物溶液的黏度提高,采出水的溶氧量从曝氧前的0.25 mg/L增至9.42 mg/L时,聚合物溶液的黏度增幅为14.88%~19.16%,聚合物溶液浓度越大,黏度损失的控制效果越显著;抗剪切性能和弹性行为也明显改善,采出水曝氧后流动工况(流速和流动沿程距离)对聚合物溶液的黏度、抗剪切性和黏弹性的影响较小;用大庆油田污水站采出水配制聚合物溶液的水质初始最佳溶氧量约为6 mg/L。研究结果从定性到定量科学化构建了降低聚合物溶液黏度损失的油田采出水曝氧调控方法。
[Abstract]:On the basis of the traditional technology of coagulation and oil removal, filtration and impurity removal, aeration treatment was carried out before injection to reduce the viscosity loss of polymer solution. It has become an important work in the surface engineering of tertiary oil recovery polymer flooding. In order to establish a scientific method to evaluate the aeration degree of the effluent, the universal test method of the dissolved oxygen quantity before and after the aeration of the effluent was standardized, and the viscosity of the polymer solution under the conditions of oxygen dissolved in the water and the flow in the mine field after the aeration of the effluent was studied. Effects of shear resistance and viscoelasticity. The results show that the dissolved oxygen tube colorimetric method needs to select the appropriate oxygen measuring tube according to the range of dissolved oxygen quantity before and after oxygen exposure, while the electrochemical probe method has more advantages in generality and resolution, so it can be selected first. With the increase of aeration degree, the viscosity of polymer solution increases. When the dissolved oxygen content of produced water increases from 0.25 mg/L to 9.42 mg/L before aeration, the viscosity of polymer solution increases by 14.88% and 19.16%, and the concentration of polymer solution increases. The control effect of viscosity loss is more obvious, shear resistance and elastic behavior are also improved obviously, flow condition (flow velocity and flow distance) after aeration has little effect on viscosity, shear resistance and viscoelasticity of polymer solution. The initial dissolved oxygen amount of polymer solution produced from the wastewater of Daqing Oilfield is about 6 mg / L. The results showed that the aeration control method of oilfield produced water was constructed to reduce viscosity loss of polymer solution from qualitative to quantitative.
【作者单位】：提高油气采收率教育部重点实验室(东北石油大学);大庆油田有限责任公司博士后科研工作站;
【基金】：国家自然科学基金“油水乳状液流场压降与剪切能的关联及其对化学破乳机制的影响”(项目编号51404068) 黑龙江省博士后基金“含聚污水深度处理工艺运行界限及配套技术研究”(项目编号LBH-Z16037) 黑龙江省普通本科高等学校青年创新人才培养计划(项目编号UNPYSCT-2015074)
【分类号】：TE357.46

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