SHM气田含油污水处理药剂筛选

Selection of Additives for Oily Wastewater Treatment in SHM Gas Field

马云贵 董 悦 解永刚 刘姣姣 胡均志 马连伟 赵轩刚 何彦君

MA Yungui DONG Yue XIE Yonggang LIU Jiaojiao HU Junzhi MA Lianwei ZHAO Xuangang HE Yanjun

SHM气田采出污水具有高含油、 悬浮固体含量高、 高矿化度、 弱酸性、 油水分离慢等特点， 影响回注系统的 正常运行。采用混凝沉降法处理采出污水， 对 pH值调节剂、 除铁剂、 无机絮凝剂和有机絮凝剂的种类和加量进 行了优选， 研究了加药时间间隔和加药次序对絮凝效果的影响。结果表明， 在气田采出污水中先加入 0.5 mL/L 除铁剂双氧水、 3 min后用NaOH将pH值调至7.5左右、 1 min后加入100 mg/L无机絮凝剂PAC、 2 min后加入6 mg/L 有机絮凝剂阳离子聚丙烯酰胺， 处理后水质由弱酸性变为中性， 絮体完全沉降时间为 8 min， 悬浮固体含量由 400 ～ 700降至14～ 30 mg/L， 含油量由 722～ 1366降至 32～ 42 mg/L， 达到注入水水质要求。表 7参 13

The produced water of SHM gas field was characterized by high oil content， high suspended solid content， high salinity， weak acid and slow separation of oil and water， which affected the normal operation of re-injection system. The produced water was treated by coagulating sedimentation， and the types and dosages of pH regulator， iron removal agent， inorganic flocculant and organic flocculant were studied. Finally， the effect of dosing interval and dosing order on flocculation was researched. The results showed that the water quality changed from weak acid to neutral after the following steps. First， 0.5 ml/L of iron removal agent hydrogen peroxide solution was added to the wastewater. Second， the pH value was adjusted to about 7.5 with NaOH 3 minutes later. Third， 100 mg/L inorganic flocculant PAC was added 1 minute later， and 6 mg/L organic flocculant cationic polyacrylamide was added 2 minutes later. After the treatments， the complete flocculation time of floc was 8 min， and the suspended solid content decreased from 400—700 to 14—30 mg/L， the oil content decreased from 722—1366 to 32—42 mg/L， which met the quality requirement of injection water.