崖13-1气田次氯酸钠溶液自流加注海水系统改造方案研究与实践

Research and practice on modification scheme of sodium hypochlorite gravity-flow injection to seawater system in Yacheng 13-1 Gas Field

海洋平台通常通过电解海水分离出次氯酸钠溶液再回注入海水换热系统中,以防止海生物的衍生物堵塞海水换热系统管道和设备。崖13-1气田次氯酸钠溶液回注海水换热系统常因加注设备频发故障,导致次氯酸钠溶液加注海水换热系统功能失效。提出两种解决方案,综合考量后最终选择直接在次氯酸钠加注泵上游加装一条D 150 mm旁通管道,利用除氢气罐中次氯酸钠溶液的重力自流加注到海水泵的吸入口,实现次氯酸钠溶液的自流加注,可直接替代次氯酸钠加注泵。目前该改造方案已经在平台试行,次氯酸钠加注系统稳定运行至今,成效显著,可为中海石油其他平台的次氯酸钠加注海水系统提供借鉴。

Offshore platform normally separates sodium hypochlorite from seawater by electrolyzing the seawater, and then the sodium hypochlorite is injected into the seawater heat transfer system to get rid of marine growth so as to prevent the derivative of marine growth to block the pipeline and the equipment of the seawater heat transfer system. The sodium hypochlorite solution injection system in Yacheng 13-1 Gas Field is often out of work because of failure of the injection equipment. The modification scheme is put forward that a bypass tube of D152 mm is added in the upstream of the injection pump,then the sodium hypochlorite solution from the dehydrogenation tank is injected into the inlet of the seawater pump as gravity-flow. Thus, the injection pump of sodium hypochlorite solution is not needed. Now, the modification scheme is implemented in the test operation on the platform and the sodium hypochlorite injection system operates steadily.