摘要
采用已知大小的碳酸钙固体颗粒模拟新疆油田采出水中的悬浮颗粒,研究了颗粒沉降规律及影响因素,实验结果表明,影响颗粒沉降的主要因素是絮凝剂,其次是p H值和离子强度。低浓度絮凝剂(20 mg/L)存在条件下,颗粒沉降速率及沉降效率即有显著提高,浓度越大,效果越明显;随着p H值的增大,颗粒沉降速率及沉降效率同样有明显提高;低矿化度条件下(<500 mg/L),颗粒沉降速率几乎无变化,矿化度达到2 000mg/L时有较为明显提高;钙镁离子浓度的影响等同于矿化度的影响;聚合物整体上会促进颗粒的沉降,达到净化效果,但由于聚合物溶液存在一定粘度导致颗粒沉降规律变化较为复杂。
The main structure of suspended particles in produced water of Xinjiang oil is calcium carbonate, existing as crystalline form. Owing to disturbance of various external factors such as the difference of sampling time, liquid level of storage tank, fluctuation of liquid etc, the difference of particles content before and after sedimentation can not be obtained accurately. So known size particles of calcium carbonate were adopted as simulative suspended particles to carry out studies on sedimentation rules. The influences of solution salinity, calcium and magnesium concentrations, p H value, polymer concentration, and flocculant concentration were investigated comprehensively. The results showed the primary factor influencing sedimentation of particles was flocculant, and followed by p H value and salinity. Even though the concentration of flocculant was lower, such as 20 mg/L, sedimentation rate and efficiency were both improved obviously. The higher the concentration was, the more obvious the effect was. With the increase of p H value, sedimentation rate and efficiency were also both improved obviously. Under the condition of lower salinity（below 500 mg/L）, sedimentation rate was almost unchanged. But when the salinity was over 2 000 mg/L, sedimentation rate increased gradually. The effect results of calcium and magnesium concentrations were the same as salinity. As for polymer, it slightly promoted the sedimentation of particles, and can purify water accordingly. Because of viscosity of polymer solution, the variation of sedimentation was a little more complicated.
作者
宫兆波
郭进周
林莉莉
吐逊阿依
郭勇
王帅
GONG Zhao-Bo;GUO Jin-Zhou;LIN Li-Li;TUXun-A-Yi;GUO Yong;WANG Shuai(PetroChina Xinjiang Oil Field Company Experimental Research Institute, Xinjiang Wulumuqi 834000, China;Key Laboratory of Chemistry of Northwest Plant Resource, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Gansu Lanzhou 730000, China)
出处
《当代化工》
CAS
2018年第4期680-683,共4页
Contemporary Chemical Industry
基金
国家科技重大专项(2016ZX05011-003-006)
关键词
采出水
颗粒
沉降
碳酸钙
絮凝剂
Produced water
Particle
Sedimentation
Calcium carbonate
Flocculant
