火驱尾气管网冻堵机理分析及防治对策研究

发布时间：2018-08-16 10:04

【摘要】：随着辽河油田火驱开发的不断深入,注空气系统及尾气处理系统冬季冻堵问题日益突出,由此可能带来以下问题:一是堵塞压力计和流量计的出入口,导致读数错误和计量错误;二是管道堵塞减少气体输送量,增大管线压差,损坏管件,甚至导致管道事故;三是注空气管线冻堵后,单井注不进;尾气管线冻堵后,回收尾气的起始点油井回压升高,油井降产或采不出。这些问题都会影响火驱的安全生产。针对上述矛盾,急需开展火驱生产系统冻堵机理及治理对策研究,明确冻堵机理,分析冻堵影响因素,提出行之有效的解决冻堵问题的措施,保证火驱开发过程顺利推广。首先,根据注气管网、尾气回收管网气体组分(H2S、CO2、CH4),研究冷凝水以及不同气体组成(如:H2S-CO2、H2S-CO2-CH4等)情况下,水合物的形成机理。其次,以现场注汽管网与尾气回收管网为研究对象,采用数值模拟与理论分析相结合的方法,研究管道属性、管道运行压力、尾气组分(CH4、H2O)、环境温度、尾气流量、分输压差对冻堵的影响,结果表明流量、管长对冻堵位置的影响较大、含水量对其影响次之,并根据模拟过程中水合物生成速度、生成位置、生成质量等,建立火驱尾气管网冻堵位置预测的数学模型。最后,针对曙光采油厂56号站,通过优选抑制剂类型,确定抑制剂注入量以及注入方式,设计防冻堵的最优方案。
[Abstract]:With the development of fire drive in Liaohe Oilfield, the problem of freezing and plugging in air injection system and tail gas treatment system is becoming more and more serious in winter, which may bring the following problems: first, blocking the entrance and exit of pressure gauge and Flowmeter, Causes reading errors and metering errors; second, pipe blockage reduces the amount of gas conveyance, increases pipeline pressure difference, damages pipe fittings, and even leads to pipeline accidents; third, after air injection pipeline freezes, a single well does not enter; after exhaust pipe is frozen, The starting point for recovery of exhaust gas is that the back pressure of the well rises, and the oil well reduces or fails to produce. These problems will affect the safety of fire drive production. In view of the above contradictions, it is urgent to carry out research on freezing plugging mechanism and treatment countermeasures of fire drive production system, clarify the freezing plugging mechanism, analyze the influencing factors of freezing plugging, and put forward effective measures to solve the frozen plugging problem, so as to ensure the smooth popularization of fire drive development process. Firstly, the formation mechanism of hydrates in condensate water and different gas compositions (such as H _ 2S-CO _ 2, H _ 2S-CO _ 2-CH4 and so on) is studied according to the gas components of gas injection network and tail gas recovery network (H _ 2S _ (CO _ 2) H _ (2) C _ (2) Ch _ (4). Secondly, taking the steam injection pipe network and the exhaust gas recovery network as the research object, using the method of the combination of numerical simulation and theoretical analysis, the paper studies the pipeline properties, pipeline operating pressure, tail gas component (Ch _ 4H _ 2O), ambient temperature, exhaust gas flow. The results show that the flow rate and pipe length have a great influence on the freezing plugging position, and the water content has the second influence on the freezing plugging position, and according to the hydrate formation speed, the formation position and the formation quality during the simulation process, etc. A mathematical model for predicting the location of freezing plugging in fire drive tail gas networks is established. Finally, according to No. 56 station of Shuguang Oil production Plant, the optimal scheme of anti-freezing plugging is designed by selecting the type of inhibitor, determining the injection quantity and injection mode of inhibitor.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE38

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