海上聚合物驱油田污水处理剂的开发利用

Development of Clarifiers for Produced Water Used for Offshore Polymer Flooding Oilfields

聚合物驱污水中含有大量水解聚丙烯酰胺,由于带有大量的羧酸根而带负电荷,处理难度大。目前,主要的商用清水剂为聚阳离子类,如阳离子聚丙烯酰胺、聚铝等,其机理是利用静电中和作用,实现油滴聚集上浮从而净化水质,但在处理的同时会导致大量含聚合物的油泥产生,引起生产流程的堵塞。为了解决该问题,研制了非离子类清水剂,并在海上平台污水处理流程中进行了加注,观察处理效果,加注后水质稳定,满足回注要求。下一步将扩大试验规模,评估并指导新型药剂的研制。

The produced water of polymer flooding contains a large amount of dissolved hydrolyzed polyacrylamide （HPAM）. It is difficult to treat HPAM which is a type of polyanion with lots of carboxyl groups. Currently, commercial water clarifiers are mainly polycationic, such as cationic polyacrylamindes, polyaluminum chloride. While attracting the anionic oil drops, the clarifiers can also interact with HPAM in the wastewater, resulting with a large quantity of viscous oil sludge and blocking the production process. To settle this problem, nonionic water clarifiers were synthesized and injected into the produced water from the offshore platform. The results showed the water quality was stabilized after injection and met the requirements on reinjection. The test will be carried out on a larger scale for the purpose to evaluate development of new-type of agents.