斜井液氮盐水联合冻结温度场研究

发布时间：2018-03-13 00:07

本文选题：冻结法　切入点：斜井　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国西部地区普遍采用斜井开拓方式,斜井井筒穿过上部不稳定地层往往采用盐水冻结法施工。盐水冻结时间长,施工速度慢,若采用液氮、盐水联合冻结,既能缩短工期,又能灵活应对施工过程中出现的各种问题。因此,本文提出液氮、盐水联合的冻结方式。目前,联合冻结虽然在斜井工程中有一定应用,但缺乏全面、系统的研究,为此,本文提出“先盐水再液氮冻结”、“先液氮再盐水冻结”、“液氮盐水同时冻结”三种联合冻结方式,并对相应的冻结温度场变化规律开展研究。首先,采用解析分析法对联合冻结温度场进行研究。在盐水单管冻结温度场解析公式基础上得到适用于液氮冻结的单管冻结温度场解析公式,在此基础上推导出“先盐水再液氮冻结”、“先液氮再盐水冻结”的单管联合冻结温度场解析公式,以及“液氮盐水同时冻结”双管联合冻结温度场解析公式。其次,开展了联合冻结温度场数值计算研究。建立了平面导热计算模型,利用大型有限元计算软件包,对单排管、双排管、多排管的联合冻结温度场进行了分析,获得了冻结管布置间距、排距、盐水冻结时间、盐水温度、液氮冻结时间、液氮温度等参数对联合冻结温度场的影响规律,掌握了不同冻结方式下相邻排冻结管对温度场的相互影响规律;针对液氮冻结管温度分布不均匀的情况,根据反演分析得到的参数,建立了三维导热计算模型,获得了液氮补强冻结温度场分布规律。最后对袁大滩副斜井第三、四段初始地温、盐水温度、测温孔温度、液氮排气温度等参数进行了现场实测研究,分析了联合冻结温度场的发展规律。
[Abstract]:In the western part of China, inclined well development is generally adopted. The inclined well shaft is often constructed by brine freezing method through the upper unstable formation. The brine freezing time is long and the construction speed is slow. If liquid nitrogen is used, the construction time can be shortened if the liquid nitrogen is used in combination with salt water freezing. Therefore, the combined freezing method of liquid nitrogen and brine is put forward in this paper. Although the joint freezing method has certain application in inclined well engineering, it lacks comprehensive and systematic research. In this paper, we propose three combined freezing methods: first brine and liquid nitrogen freezing, first liquid nitrogen and brine freezing, and then study the change of corresponding freezing temperature field. The combined freezing temperature field was studied by analytical analysis method. Based on the analytical formula of freezing temperature field of single tube in brine, the analytical formula of single tube freezing temperature field suitable for liquid nitrogen freezing was obtained. On this basis, the analytical formula of single tube combined freezing temperature field and double tube combined freezing temperature field of "first brine freezing and liquid nitrogen freezing" and "liquid nitrogen and brine freezing" are derived. The numerical calculation of joint freezing temperature field is carried out. The plane heat conduction calculation model is established, and the combined freezing temperature field of single row tube, double row tube and multi row tube is analyzed by using the large finite element calculation software package. The influence of the parameters such as the arrangement distance of freezing pipe, the spacing of discharge, the freezing time of brine, the temperature of brine, the freezing time of liquid nitrogen and the temperature of liquid nitrogen on the combined freezing temperature field are obtained. According to the temperature distribution of liquid nitrogen freezing tube, the three-dimensional heat conduction calculation model is established according to the parameters obtained from the inversion analysis. The distribution law of freezing temperature field of liquid nitrogen reinforcement is obtained. Finally, the initial ground temperature, salt water temperature, temperature hole temperature and exhaust temperature of liquid nitrogen in the third and fourth member of the auxiliary inclined well of Yuan Dattan are studied in situ. The development law of joint freezing temperature field is analyzed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD265.34

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