Produced water (PW) of the liquid phase is the largest volume by-product from the process of offshore oil and gas production, and compact and efficient treatment methods are brought into focus. The PW, condensate oil, and floccule in the liquid phase all require treatment to satisfy the requirements of the standards. The liquid phase volume from offshore gas fields is typically not as large as that from offshore oil fields. The presence of the floccule and severity of emulsification, however, cause higher levels of treatment difficulty. Ecological damage to the ocean and some other potential hazards can be caused if PW discharged into the ocean contains oil that exceeds the concentrations of the value, of which ranges from 15 mg/L to 50 mg/L according to different standards. Condensate oil phase pipes may also be corroded if the oil phase is not well treated. This study examines a pilot system with the capacity of 0.5 m³/h, that includes pre-, PW, and condensate oil treatments performed at an industrial offshore gas field platform on the South China Sea. The water and oil phases were transparent in appearance. The concentration of oil in the PW discharged to the ocean was less than 50% of the value of the relative standards. The concentration of water in the condensate oil was lower than 200 mg/L, which satisfied the requirement of this platform for transportation by submarine pipelines. The accumulative floccule in the liquid phase was also gathered using a filter bag that proceeded a virtuous circle due to the avoidance of the accumulation of the floccule. This pilot system provides a novel solution method for the liquid phase from offshore gas fields containing highly emulsified PW, condensate oil, and floccule, which diffuses between the PW and the condensate oil.

液相采出水（PW）是海上油气生产过程中体积最大的副产品，紧凑高效的处理方法成为焦点。液相中的PW、凝析油、絮凝物均需经过处理才能满足标准要求。海上气田的液相体积通常不如海上油田的液相体积大。然而，絮凝物的存在和乳化的严重程度会导致更高的处理难度。如果排入海洋的 PW 含有超过该值的油类，则可能对海洋造成生态破坏和其他一些潜在危害，根据不同标准，其浓度在 15 mg/L 至 50 mg/L 之间。如果油相处理不当，冷凝油相管道也可能被腐蚀。本研究考察了一个容量为 0.5 m 的试点系统³/h，其中包括在南海工业海上气田平台上进行的预处理、PW 和凝析油处理。水相和油相在外观上是透明的。排放到海洋的 PW 中的石油浓度低于相关标准值的 50%。凝析油中水的浓度低于200mg/L，满足该平台海底管道输送的要求。由于避免了絮凝物的累积，液相中的累积絮凝物也使用过滤袋进行收集，该过滤袋进行良性循环。该中试系统为海上气田含高乳化PW、凝析油和絮凝物的液相提供了一种新的解决方法，