在油田生产中,对油层注水用水的质量要求是比较高的,规定水的机械杂质含量不超过2毫克/升,含铁量不超过0.6毫克/升,以防止油层堵塞。江汉油田部分地区曾采用浅层地下水作注水水源。这种水虽系低矿化度淡水(总矿化度不超过600毫克/升),但在实际使用中却发现洗井出口的含铁量往往超过标准。经按油田注水工艺流程进行沿程各点水样的采 In oilfield production, the quality requirements for water injection are relatively high, which stipulate that the mechanical impurities of water should not exceed 2 mg / l and the iron content should not exceed 0.6 mg / l, so as to prevent oil blockage. Jianghan Oilfield in some areas have used shallow groundwater for water injection. Although this type of water is low salinity fresh water (total salinity of not more than 600 mg / l), it has been found in actual use that the iron content at the well flushing outlet often exceeds the standard. After oilfield water injection process flow along the water sampling points