Puguang Gas Field is a developing gas field with the highest level of H2S and CO2 in China,so the corrosion cracking probability of equipments and pipelines there is high.In order to avoid corrosion cracking accidents,recently complete overhaul of gas gathering stations is launched.Through analyzing corrosion parts and reasons of pipelines and equipments with different materials in the stations,it is found that local corrosion of equipments and pipelines with long production time,more impurities and water,and no maintenance is obvious.The main reasons are:high acid gas in equipments contains a lot of substances such as kill acid liquid,formation water and sulfur deposition,and pulling work and sand removal are not timely done;pipelines with no anticorrosive coating and falling out coating speed up the local corrosion;high pressure equipment and pipelines are seriously washed out by acid liquid and gas.In order to avoid further corrosion situation being more serious and ensure the pipelines and equipments in gas gathering stations under control,it is necessary to strengthen the management of acid liquid pulling and sand removal in production and operation.Meanwhile,strengthening the research work of internal corrosion protection and corrosion prevention is also important.%普光气田是目前国内正在开发的H2S和CO2含量最高的气田,设备管线出现腐蚀破裂的概率很高.为避免出现腐蚀破裂事故,近期开展了集气站场全面检修.通过对站场内不同材质管线、设备容器的局部腐蚀部位和腐蚀原因进行分析,发现投产时间长、产杂质及水多、未进行过检修的设备管线局部腐蚀较明显,主要原因为:设备内高酸气含有压井酸液、地层水、硫沉积等大量物质,并未能及时拉运、冲砂;管线和容器内未涂防腐层或防腐涂层脱落,加快了局部腐蚀;高压设备和管线受酸性气体、液体的冲蚀较为严重.为避免腐蚀情况的进一步加剧,保障集气站场管线设备处于受控状态,生产运行过程中需要加强酸液拉运、冲砂作业的管理,同时强化内防腐层修复和预防腐蚀的研究工作.
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