Oil and gas replacement for nitrogen, solve the existing oil and gas replacement for nitrogen when the oil and gas pipeline operation cost is high, the problem of security risk is relatively large, method of nitrogen replacement operation: nitrogen injection station car connection pipeline, the nitrogen injection process of gas venting in the downstream of the valve chamber. The first station of the first main pipeline replacement, when pure nitrogen detection in outbound pipeline, respectively for venting and sewage pipeline replacement method is more than DN50 valve opens 30% immediately after the closure of DN50 and below, the valve is fully open and close; the reasonable control of the nitrogen injection temperature and pressure of the oil and gas field for nitrogen replacement method a replacement, reduce nitrogen loss, reduce security risks, reduce the cost.
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【技术保护点】
油气田置换专用氮气，氮气置换操作方法：将注氮车连接 首站管道，注氮过程中，在下游阀室进行引气放空。首站先置换主管道，当在出站的管道上检测到纯氮气后，分别对放空和排污管线进行置换，方法是将ＤＮ５０以上阀门打开３０％后立即关闭、ＤＮ５０及以下阀门全开然后关闭； 注氮温度：将进入输气管道之前的氮气温度控制在５－－１５℃之间；注氮压力：０．１～０．３ＭＰａ，并且与注入天然气压保持一致； 注氮量的计算方法： Ｖ↓［１］＝７．８５×１０↑［－４］Ｄ↑［２］Ｌ↓［１］ 式中：Ｖ↓［１］为全线置换氮气的用量，ｍ↑［３］；Ｄ为置换管段的管外径，ｍｍ；Ｌ１为置换管段的长度，ｋｍ。
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