本文選題：凍結(jié)法　切入點：斜井　出處：《中國礦業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：我國西部地區(qū)普遍采用斜井開拓方式,斜井井筒穿過上部不穩(wěn)定地層往往采用鹽水凍結(jié)法施工。鹽水凍結(jié)時間長,施工速度慢,若采用液氮、鹽水聯(lián)合凍結(jié),既能縮短工期,又能靈活應對施工過程中出現(xiàn)的各種問題。因此,本文提出液氮、鹽水聯(lián)合的凍結(jié)方式。目前,聯(lián)合凍結(jié)雖然在斜井工程中有一定應用,但缺乏全面、系統(tǒng)的研究,為此,本文提出“先鹽水再液氮凍結(jié)”、“先液氮再鹽水凍結(jié)”、“液氮鹽水同時凍結(jié)”三種聯(lián)合凍結(jié)方式,并對相應的凍結(jié)溫度場變化規(guī)律開展研究。首先,采用解析分析法對聯(lián)合凍結(jié)溫度場進行研究。在鹽水單管凍結(jié)溫度場解析公式基礎上得到適用于液氮凍結(jié)的單管凍結(jié)溫度場解析公式,在此基礎上推導出“先鹽水再液氮凍結(jié)”、“先液氮再鹽水凍結(jié)”的單管聯(lián)合凍結(jié)溫度場解析公式,以及“液氮鹽水同時凍結(jié)”雙管聯(lián)合凍結(jié)溫度場解析公式。其次,開展了聯(lián)合凍結(jié)溫度場數(shù)值計算研究。建立了平面導熱計算模型,利用大型有限元計算軟件包,對單排管、雙排管、多排管的聯(lián)合凍結(jié)溫度場進行了分析,獲得了凍結(jié)管布置間距、排距、鹽水凍結(jié)時間、鹽水溫度、液氮凍結(jié)時間、液氮溫度等參數(shù)對聯(lián)合凍結(jié)溫度場的影響規(guī)律,掌握了不同凍結(jié)方式下相鄰排凍結(jié)管對溫度場的相互影響規(guī)律;針對液氮凍結(jié)管溫度分布不均勻的情況,根據(jù)反演分析得到的參數(shù),建立了三維導熱計算模型,獲得了液氮補強凍結(jié)溫度場分布規(guī)律。最后對袁大灘副斜井第三、四段初始地溫、鹽水溫度、測溫孔溫度、液氮排氣溫度等參數(shù)進行了現(xiàn)場實測研究,分析了聯(lián)合凍結(jié)溫度場的發(fā)展規(guī)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.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD265.34

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本文編號：1603911