川西气田井底积液污染物分析及对策研究  

Composition Analysis of Downhole Pollutants from Gas Wells in Western Sichuan Basin and Corresponding Countermeasures

作　　者：殷鸿尧 鲁光亮[2] 李祖友[2] 瞿超超 冯玉军[1] YIN Hongyao;LU Guangliang;LI Zuyou;QU Chaochao;FENG Yujun(Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, P R of China;West Sichuan Gas Production Plant, Southwest Oil and Gas Company, Sinopec, Deyang, Sichuan 618000, P R of China)

机构地区：[1]四川大学高分子研究所高分子材料工程国家重点实验室,四川成都610065 [2]中国石化西南油气分公司川西采气厂,四川德阳618000

出　　处：《油田化学》2018年第1期97-101,共5页Oilfield Chemistry

基　　金：国家科技重大专项"低压低产井高效泡排剂的研发与应用研究"(项目编号2016ZX05048-004-007)

摘　　要：泡沫排水是维持天然气正常生产的重要措施,但长期形成的井底积液极易污染储层,且污染物组成不明确,导致难以有针对性地设计、制备合适的泡排药剂开展高效排水采气作业。本文以川西气田6口气井井底积液为样本,联合使用红外光谱仪、核磁共振仪和色谱-质谱联用仪等多种仪器建立了污染物分析方法,测定了积液的主要成分和含量,分析了污染物来源,提出了相应的处理方法。结果表明,川西气田不同气井积液中各类污染物含量差别较大,污染物主要为表面活性剂、无机盐和凝析油。对于含有表面活性剂的井底积液,采用的泡排剂中应少加醇类或不加醇类物质,以减轻气井乳化物污染;采用抗盐性能较优异的两性离子表面活性剂和非离子型表面活性剂作为泡排剂主要成分或用酸液溶解无机物可降低无机盐对泡排作业的影响;对于凝析油含量高的气井,可以用长链烷基氧化胺型表面活性剂作为泡排剂的主要成分。Foam draining was important for maintaining normal production of natural gas. However,the water loading in downhole was vulnerable to be contaminated by different chemicals,which made it difficult for us to design and produce highly-efficient foaming agents. In this study,a general analysis method for downhole pollutants was established based on the combination of infrared spectrometer,nuclear magnetic resonance spectrometer and liquid chromatograph mass spectrometer,et al. The main composition and corresponding content of pollutants in water loading from six gas wells in western Sichuan basin were analyzed following this method,and then the source of pollutants was discussed. The results showed that the pollutants content of each well was very different,and the main composition of pollutants was surfactants,inorganic salts and condensate oil. If the pollutants had surfactants,the foaming agents should not contain or only had a little bit of alcohols in order to avoid forming emulsion.Furthermore,using zwitterionic surfactant or nonionic surfactant as the main component of foaming agents,or using acid liquid dissolving inorganic salts could reduce the adverse impact of inorganic salts on foaming operation. In addition,using amine oxide surfactant with long-chain alkyl group as the main composition of foaming agent was beneficial for the draining of wells with high content of condensate oil.

关 键 词：川西气田 井底积液 污染物 成分分析 泡沫排水采气 

分 类 号：TE37[石油与天然气工程—油气田开发工程] O657[理学—分析化学]