塔里木高含硫地区钻井井控安全研究

发布时间：2018-04-02 07:18

本文选题：高含硫气体　切入点：塔里木油田　出处：《西安石油大学》2015年硕士论文

【摘要】：随着我国石油天然气勘探开发的不断深入,深井超深井钻井(4500m~7000m)已较为普遍。塔里木油气田普遍具有高温、高压、高含硫的特点。高含硫气藏一般易出现异常高压地层,钻进过程中容易发生气侵,高含硫气体侵入后气体在井筒密度、黏度等物性变化较大,特别是在近井口处体积急剧膨胀,而且时间极短,易导致井涌或井喷等钻井事故,造成严重的后果,因而有必要开展高含硫气体侵入时流动规律的研究,根据流动规律采取相应的井筒控制措施。本文在酸性天然气PVT特性分析基础上,优选了其密度、黏度等物性参数计算方法;并针对酸性气体中的主要成分甲烷、硫化氢、二氧化碳,通过对比采用高精度的亥姆霍兹(Helmholtz)自由能方法计算其主要物性,在此基础上,建立高含硫气体侵入井筒流动传热耦合模型,分析研究了高含硫气体侵入井筒流动规律及其影响因素,揭示了高含硫酸性气体(包括纯酸性组分)在钻井井筒内流动的机理,为高含硫气体井涌、井喷事故的预防及处理方法提供理论基础,为塔里木油田高含硫地区安全、高效钻井提供技术指导。
[Abstract]:With the development of petroleum and natural gas exploration and development in China, deep and ultra-deep well drilling has become more common. Tarim oil and gas fields are generally characterized by high temperature, high pressure and high sulfur content. High sulfur gas reservoirs are prone to abnormal high pressure formation. Gas invasion is easy to take place in drilling process. The physical properties of gas such as wellbore density, viscosity and so on change greatly after high sulfur gas intrusion, especially when the volume expands rapidly near the wellhead, and the time is very short, which can easily lead to drilling accidents such as wellbore or blowout. Because of the serious consequences, it is necessary to study the flow law of high sulfur gas intrusion and to take corresponding wellbore control measures according to the flow law. Based on the analysis of the PVT characteristics of acid natural gas, the density of the gas is optimized. The viscosity and other physical parameters are calculated, and the main physical properties of methane, hydrogen sulfide and carbon dioxide, which are the main components of acid gas, are calculated by comparing the high precision Helmholtz-based free energy method. The heat transfer coupling model of high sulfur gas intruding into wellbore is established. The flow law and its influencing factors are analyzed and studied, and the mechanism of high sulfuric acid gas (including pure acid component) flowing in well bore is revealed. It provides a theoretical basis for the prevention and treatment of high sulfur gas wellbore and blowout accidents, and provides technical guidance for safe and efficient drilling in the high sulfur bearing area of Tarim Oilfield.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE28

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