<正>一、项目背景磨溪区块龙王庙组气藏是西南油气田分公司2012年新发现储量和产能潜力较大的下寒武系含硫气藏。2013年分公司将开展干法脱硫装置建设工程列为重点产能建设项目和加快龙王庙组气藏勘探开发的四项举措之首,由成都天科石油天然气工程有限公司(以下简称天科公司)承接该EPC项目。该装置大胆采用了3列12座干法脱硫塔串并联结合工艺。已于2013年5月4日建成交付,5月9日正式投入运行。为尽早获取龙王庙组气

Aiming at the development environment of the sour oil field located in the northwest of China,it is analyzed in the way of the corrosion factors including hydrogen sulfide,carbon dioxide,water,choric ion etc.It summarized the primary controlling factor and development trend of oil field corrosion.Measures and advices of corrosion control and safe operation were provided on the aspect of materials,corrosion inhibitor,corrosion monitor and so on.

Field and laboratory tests were carried out based on the corrosion problems of the sour gas fields. The results showed that the corrosion of the medium in the field was not serious at present, the corrosion rate of the materials were lower than 0.1mm/a, and the corrosion represented as pitting corrosion. The content of the Cl~- in the water had greater effects on the corrosion according to the laboratory tests. High Cl~- content ground water or elemental sulfur maybe appear during the course of production and their influences on the corrosion as well as inhibition methods should be considered.

Given the high pressure and corrosion environment with 8%-16% of H2S content and 5%-10% of CO 2 content in the gathering line for a domestic gas field with high sulfur content, the possible corrosion factors are analyzed. And with static high temperature autoclave, the acting law of different corrosion factors, such as H 2S, CO 2, temperature, Cl, and elemental sulfur, etc, on the steel 20# is investigated. The results show the steel 20# is corroded severely in the experimental scope. The corrosion rate is at 0. 348 - 2. 559 mm/a. But the temperature, Cl content in water and elemental sulfur are the main factors of the steel 20# corrosion. The higher the Cl content is, the faster the corrosion rate is. The corrosion rate of the steel 20# is bigger relatively at 40 ̊C of temperature. The weight-loss corrosion and pitting corrosion will be speeded since the elemental sulfur existing. The maximum pitting corrosion depth is 4. 867 mm/a. Based on the in-house study, it is suggested the proper measures should be taken to remove the elemental sulfur deposited in the gathering line and keep out of temper ature about 40 ̊C for the pipeline operation to reduce the corrosion. Also, the corrosion control should be enhanced for the gathering line where the formation water with high Cl content converges.

针对哈萨克斯坦扎纳若尔凝析气田的腐蚀环境,从全面腐蚀和局部腐蚀两方面着手,采用ISO、NACE及国内腐蚀防护的相关标准或评价方法,考察了H2S、CO2、Cl、温度及油水比等各因素对腐蚀的影响.在此基础上,对气田的腐蚀因素进行了综合分析,总结出该气田的主要腐蚀因素、腐蚀类型及各因素的变化对气田腐蚀的影响规律和趋势;预测了气田发生严重腐蚀的可能部位及其腐蚀形态,为气田开发防腐方案的制定奠定了基础.研究结果表明,在扎纳若尔凝析气田开采和集输过程的工况条件下,腐蚀环境相当恶劣,具有产出液体的多相性、腐蚀介质的多样性和腐蚀形态的复杂性三大特点.该气田以H2S产生的电化学腐蚀为主,氢脆和SCC共存.腐蚀最严重的部位应在井底,以点蚀为主;对管道而言,要特别注意氢脆和SCC.当介质含水量达到50%～80%时,各类腐蚀均将加剧.