摘要
对用碱剂处理高腐蚀性的广利回注污水、进行水质改性及缓蚀、阻垢问题进行了室内实验研究。用单一碱剂(NaOH ,Ca(OH) 2 ,NaCO3 ,NaSiO3 )处理后的广利污水 (pH =8.5 ) ,腐蚀速率达到注水要求 ,但悬浮物含量急剧上升。碱处理后加入筛选的二元复配絮凝剂沉淀 30分钟的中层水样 ,腐蚀速率、总铁、悬浮物、含油、SRB数均符合注水要求 ,但残渣量很大 ,沉降 4小时以后 ,湿渣率为 6 %～ 9% ,干渣率为 0 .0 9%～ 0 .4 6 %。根据各碱剂的优缺点将碱剂复配 ,优选出了未报道其组成的 3种复配碱剂 ,与絮凝剂结合使用 ,使湿渣率降至 5 %～ 8% ,干渣率降至0 .0 6 4 7%～ 0 .0 70 9%。其中复碱F用量中等而pH值易调 ,干渣率 0 .0 6 4 7%。与地层水相比 ,复碱改性污水及其与地层水的混合水更易结垢。根据理论预测 (6 0℃ ) ,复碱改性使广利污水的CaCO3 结垢性由临界变为结垢 ,使CaSO4结垢性由不结垢变为结垢或临界。筛选了供复碱改性广利污水使用的阻垢剂。以一种标准盐水测定的渗透率为基准 ,精细过滤广利站处理后回注污水和复碱处理广利污水先后流过 3支地层岩心 ,使渗透率分别下降6 .2 %～ 7.8%和 3.9%～ 4 .7%。因此 ,复碱改性并作絮凝、阻垢处理的广利污水可用作注水。大量污泥的处理是待解决的问题。图 1表 11参 5?
Alkaline treatments with corrosion and scaling inhibition of highly corrosive recycled produced water (RPW) of Guangli water treating plant, Dongxing, Shengli, for reservoir flooding are conducted in laboratory experimentally. The RPW samples treated by single alkalines (NaOH, Ca(OH)_2, Na_2CO_2, and Na_2SiO_3) and having pH=8.5 show satisfactory corrosion rates but rather high suspended solids (SSs) contents. For RPW samples treated with alkalines and two flocculants in combination, sedimentated in 0.5 hr and taken from the medium layer, the corrosivity, contents of total Fe, SSs, and oily sub stances, and SRB bacterial population are fairly satisfactory but the percent solid residua are very high: 6-9% (v/v) in wet state and 0.09-0.46% (m/m) in dry state. With 3 favorable combinational alkalines (CA) of unknown composition and the above mentioned mixed flocculant additionally, the wet residua creation (WRC) is decreased to 5-8% (v/v) and the dry residua creation (DRC)-to 0.0647-0.0709%. With CA notated as F, the pH of RPW samples is easily adjustible at a medium use level and a DRC of 0.0647% is obtained. The scale formation tendency of the CA treated RPW and its mixture with the reservoir formation water is stronger than that of the formation water. The theoretical predictions of scaling (60℃) show that the CA treatments change CaCO_3 in RPW from critical state to scale forming state and CaSO_4 in RPW from critical state to scale forming and, in one case, critical states. A scale inhibitor is chosen for CA treated RPW. Large amounts of finely filtrated purified RPW of Guangli and CA treated RPW are flown successively after a standard brine through 3 reservoir cores and cause damage in core permeability of 6.2-7.8% and 3.9-4.7%, respectively. It is concluded that the RPW of Guangli can be used for reservoir flooding after such CA treatment with additional purification with flocculant and scale inhibition however the handling with sludge created in large amount is still a serious problem to be solved.
出处
《油田化学》
CAS
CSCD
北大核心
2004年第2期154-158,190,共6页
Oilfield Chemistry
关键词
广利油田
油田污水
污水处理工艺
改性技术
水质
recycled produced water
wastewater treatment
alkaline treatment
injection water quality
waste water purification
compatibility of water
scaling behavior
Guangli oil field in Shengli
sludge creation
