气井井下泡排节流机理研究

发布时间：2018-03-21 16:25

本文选题：气井　切入点：井下节流　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：泡沫排水采气工艺技术凭借其成本低、工艺简单、见效快的优点成为排水采气工艺的首选。但由于部分气田气井普遍下有节流嘴,给泡沫排水采气工艺的实施带来了一定程度的局限性。有些节流气井采取泡沫排水措施后效果很差甚至无效,泡排剂投入后井筒内流动情况已经很难以判断,而且节流嘴的存在使得井筒中流动规律更加复杂,对气井泡排节流工艺的实施造成了很大困难。目前针对气水两相节流压降的模型研究较多,但是针对泡排节流压降的模型非常少,并且现有计算泡排节流的模型很多都是在气水模型上进行修正,并没有考虑泡沫流体自身与气水节流不同的性质。本文在大量文献调研的基础上,开展了气水管流、泡排管流、气水节流与泡排节流四类共计105组实验,观察井筒内流型变化、流态变化,分析节流嘴前后压力、气体流量、液体流量等测试数据,并且使用两种不同浓度的泡排剂进行对比实验。对单个气泡进行受力分析,通过考虑气泡在井筒中的排列特征建立了一种新的泡沫流体密度计算模型,通过新的密度模型对泡沫节流压降模型进行修正,利用实验对Perkins模型、Ashford模型、Sachdeva模型和泡沫节流修正模型进行了评价,选取适合的泡沫流体井筒压力温度分布模型,建立泡排节流井筒压力温度场耦合模型并且针对现场数据进行计算验证,编制了针对现场的井下泡排节流理论计算典型图版。
[Abstract]:Foam drainage gas recovery technology has become the first choice of drainage gas production technology because of its advantages of low cost, simple process and fast efficiency. However, because of the common throttling nozzle in some gas wells in gas fields, It has brought some limitations to the implementation of foam drainage and gas recovery technology. Some gas wells with gas throttling have poor or even ineffective effect after adopting foam drainage measures, and it is difficult to judge the flow situation in the wellbore after the foam draining agent is put in. Moreover, the existence of throttle makes the flow law in wellbore more complicated, which makes it very difficult to implement the throttling process of bubble discharge in gas well. At present, there are many researches on the model of gas-water two-phase throttling pressure drop. However, there are very few models for the pressure drop of bubble row throttling, and many of the existing models for calculating bubble row throttling are modified on the air-water model. On the basis of a great deal of literature investigation, 105 groups of experiments were carried out in this paper, including air pipe flow, bubble discharge pipe flow, gas water throttling and bubble discharge throttling, to observe the change of flow pattern in wellbore. The pressure, gas flow rate and liquid flow rate before and after throttling nozzle are analyzed, and two different concentrations of bubble discharge agent are used to carry out comparative experiments. A new foam fluid density calculation model is established by considering the arrangement characteristics of bubbles in the wellbore, and the foam throttling pressure drop model is modified by a new density model. The Perkins model, the Ashford model, the Sachdeva model and the modified foam throttling model are evaluated by experiments. The suitable wellbore pressure and temperature distribution model of foam fluid is selected. The coupling model of pressure and temperature field of bubble row throttling well bore is established and the field data is calculated and verified. A typical chart of theoretical calculation for downhole bubble row throttling is developed.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE377

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