东方13-1高温高压气藏凝析水析出规律及积液风险研究

发布时间：2017-12-30 23:28

本文关键词：东方13-1高温高压气藏凝析水析出规律及积液风险研究　出处：《重庆科技学院》2017年硕士论文　论文类型：学位论文

【摘要】：东方13-1气藏属于典型的高温高压气藏。由于气藏温度较高,烃类流体与地层水的互溶能力较强,天然气中水蒸气含量也比普通气藏高。在此类气藏的开发过程中,随着温度、压力的变化,天然气容易析出凝析水。无论凝析水的析出发生在储层中还是井筒内都将影响气藏的开发效果。针对东方13-1高温高压气藏凝析水析出规律认识不清,积液风险分析不足的现状,本文从实验出发,对凝析水的析出规律进行了研究,综合临界携液流量和气井产能研究结果,对气井的积液风险进行了分析,取得了以下成果和认识:(1)在调研的基础上,建立了一套高温高压气藏凝析水析出规律研究的实验方法,开展了相关实验。实验结果表明:天然气含水量随压力的降低而升高,随温度的升高而升高;天然气中的水蒸气不会在储层中析出,但会在井筒中析出。(2)通过开展核磁共振实验,进行了气井产水来源研究。实验结果表明:因膨胀而被采出的束缚水量极少;气藏压力降低后,束缚水会以水蒸气的形式进入天然气中,进而导致天然气中水蒸气含量增加。(3)综合考虑井眼轨迹、气井温压分布、界面张力变化等因素建立了新的临界携液流量计算模型。研究结果表明:气井临界携液流量是一个动态变化的量,受气藏的温度、压力、生产水气比以及气井的井身结构、油管大小、工作制度等因素影响,应根据气藏与气井的基本情况和生产动态对气井临界携液流量进行计算。(4)总体看来,对于东方13-1气藏而言,在产出水主要为凝析水的情况下,气井积液风险较低,采用合理的生产制度可以避免积液。
[Abstract]:Dongfang 13-1 gas reservoir is a typical high temperature and high pressure gas reservoir. The water vapor content in natural gas is also higher than that in ordinary gas reservoirs. It is easy to precipitate condensate water from natural gas. Whether the precipitation of condensate water occurs in the reservoir or in the wellbore, it will affect the development effect of gas reservoir. It is not clear to understand the law of condensate water precipitation in Dongfang 13-1 high temperature and high pressure gas reservoir. In this paper, the precipitation law of condensate water is studied from experiments, and the risk of gas well accumulation is analyzed by synthesizing the results of critical liquid carrying rate and gas well productivity. On the basis of investigation and investigation, a set of experimental methods for the study of precipitation law of condensate water in high temperature and high pressure gas reservoir have been established. The experimental results show that the water content of natural gas increases with the decrease of pressure and increases with the increase of temperature. Steam in natural gas does not precipitate in the reservoir, but precipitates in the wellbore. The source of water production in gas wells has been studied. The experimental results show that very little bound water is produced because of expansion. When the pressure of gas reservoir is reduced, the bound water will enter into natural gas in the form of water vapor, which will lead to the increase of water vapor content in natural gas. A new calculation model of critical liquid carrying flow rate is established by the change of interfacial tension and other factors. The results show that the critical liquid carrying rate of gas well is a dynamic change quantity, the temperature and pressure of gas reservoir. The production water gas ratio, well structure of gas well, tubing size, working system and other factors should be based on the basic situation of gas reservoir and gas well and production performance to calculate the critical liquid carrying rate of gas well. For Dongfang 13-1 gas reservoir, if the output water is mainly condensate water, the risk of gas well fluid accumulation is lower, and the reasonable production system can avoid the accumulation of liquid.
【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE37

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