Abstract：Due to the characteristics of gas field in A-B river area with characteristics of high condensate oil, sulfur content, high salinity, high hardness, and large amount of organic suspended solids in water, conventional three-stage sewage treatment method is difficult To adapt to the harsh environment, an oil flotation step-down flash H2S technology was proposed to remove the hydrogen sulfide and depressurized natural gas at the source of the water treatment system. The gas field water collection tanks and dosing methods were improved and improved, and the suspended water was removed. There are unique advantages in matter and emulsified oil, and the processing efficiency is high.
Keywords：Oil flotation;Gas field water;Step-down flashing H2S technology;Field water collection tank
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