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胜利埕岛近海油田采用注海水驱油方式开发,海水含氧7~8 mg/L。埕岛中心二号平台海水处理系统采用天然气气提工艺除氧,除氧设备故障多,天然气耗量大,除氧费用高。讨论了8类共11种化合物的除氧机理,并在2 mg/L Co2+催化剂存在下,按理论用量的0.5~2.0倍加入海水中除氧,其中亚硫酸钠、亚硫酸氢钠和丙酮肟效果最好,亚硫酸盐+肟在理论加量条件下可使海水含氧降至零,加量70 mg/L时在现场条件下使海水含氧降至0.04mg/L。该复配物定名为除氧剂HC-3,无毒,其水溶液在油封、氮封条件下可分别储存7天、15天,使用防冻液可使凝固点降至-18℃。改用质量比6∶4的Cu2++Mn2+催化剂可大大提高除氧速率。该除氧剂已于2005年7月投入现场应用,使用一种隔膜式计量泵使除氧剂、催化剂配比精确化,在除氧剂加量80 mg/L、催化剂加量16 mg/L条件下,处理后海水含氧稳定地控制在≤0.04 mg/L。图3表8参6。
Shengli Chengdao offshore oilfield is developed with injection seawater flooding, with seawater containing oxygen of 7-8 mg / L. Chengdao Center Platform II seawater treatment system using natural gas stripping process deaerator, deaerator equipment failure, natural gas consumption, high cost of oxygen. The deaeration mechanism of eleven compounds in eight classes was discussed and the deoxygenation was added to the seawater at 0.5-2.0 times the theoretical amount in the presence of 2 mg / L Co2 + catalyst. Among them, sodium sulfite, sodium bisulfite and acetone oxime were most effective Good, sulfite + oxime in the theoretical amount of the seawater oxygen can be reduced to zero, the amount of 70 mg / L under the conditions of the seawater oxygen to 0.04mg / L. The compound named oxygen scavenger HC-3, non-toxic, the aqueous solution in the oil seal, nitrogen seal conditions can be stored for 7 days, 15 days, the use of antifreeze can make the freezing point down to -18 ℃. Switch to mass ratio of 6: 4 Cu2 + + Mn2 + catalyst can greatly improve the oxygen rate. The oxygen scavenger was put into field application in July 2005. A diaphragm type metering pump was used to make the oxygen scavenger and the catalyst ratio precise. When the oxygen scavenger dose was 80 mg / L and the catalyst dosage was 16 mg / L Under the conditions, the treated seawater oxygen content is stably controlled at ≤0.04 mg / L. Figure 3 Table 8 参 6.