天然气压缩因子计算方法对比及应用

发布时间：2018-03-20 12:29

本文选题：天然气　切入点：压缩因子　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,天然气在我国能源战略中的地位逐步提升,所以天然气在各种压力和温度下的压缩因子是气藏工程和采气工艺中必需的基本数据,也是物质平衡计算,气藏储量计算的重要依据。在当下天然气的发展战略中,如何在天然气储存、管输、加工的工艺计算中对天然气压缩因子的准确确定就显得尤为重要。根据查阅文献和过往科研实践,天然气压缩因子大致可通过以下几种方式确定:1,通过测定仪器;2,通过状态方程计算压缩因子;3,用经验公式计算压缩因子;4,用Standing-Katz图版确定压缩因子。其中运用经验公式是最常见的压缩因子计算方式。本文通过对Dranchuk-Purvis-Robinson方法、Brill-Beggs方法、Redlich-Kwong方法、Hall-Yarborough方法和Gopal方法这5种方法的优选,选择出最常用的方法,并从这些常用的方法中找到最为精确的计算方法,经过对比后发现:1,如要使用计算机计算Z值时,应选用Dranchuk-Purvis-Robinson、Hall-Yarborough方法;2,如果要用人工计算Z值时则Gopal方法最为适合;3,AGA8-92DC方程与SGERG-88方程对于压缩因子计算虽然有很高的精度,但是对气体已知条件的要求相对于以上五种经验公式来说要高,所以在已知条件不能满足计算时,这两种方法的使用不如经验公式计算简单便捷。通过Microsoft Visual Basic 6.0编制天然气压缩因子计算软件的平均相对误差可以满足工程要求。随后对已知气体组分及压缩因子系数的两个气样使用AGA8-92DC方程计算两种气样的压缩因子系数,判断AGA8-92DC方程是否适合用于这两种气样的压缩因子计算。经过计算,使用AGA8-92DC方程计算管输天然气开发后期的低中压含碳贫气气藏准确性仍可以满足要求。计算含H2S等酸性组分气体的压缩因子系数时,AGA8-92DC方程计算出的压缩因子系数与实际测量值相比,在每个压力值下计算值均大于实测值,平均相对误差过大,所以AGA8-92DC方程不适宜计算含H2S等酸性组分气体的压缩因子系数。最后通过使用天然气压缩因子的计算方法结合贝格斯-布里尔方法,计算出管道条件下气体的体积流量,雷诺数和压降,经过计算所得误差为8.15%,满足工程需要,且计算压降误差小于Z值为1的情况。
[Abstract]:In recent years, the status of natural gas in China's energy strategy has gradually increased, so the compression factor of natural gas at various pressures and temperatures is the basic data necessary for gas reservoir engineering and gas recovery technology, and is also the calculation of material balance. Important basis for calculation of gas reservoir reserves. In the current natural gas development strategy, how to store and pipeline natural gas, It is particularly important to determine the compression factor of natural gas in the process calculation. The compression factor of natural gas can be determined roughly by the following ways: 1: 1, by measuring instrument 2, calculating compression factor 3 by equation of state, calculating compression factor 4 by empirical formula, and determining compression factor by Standing-Katz chart plate. The formula is the most common method for calculating the compressibility factor. In this paper, we select the Dranchuk-Purvis-Robinson method, Brill-Beggs method, Redlich-Kwong method, Hall-Yarborough method and Gopal method. Choose the most commonly used methods, and find the most accurate calculation method from these common methods. After comparison, we find that when you want to use a computer to calculate the Z value, The Dranchuk-Purvis-Robinson Hall-Yarborough method should be used. If the Z value is to be calculated manually, the Gopal method is most suitable for the calculation of compressibility factor, though the Gopal equation and the SGERG-88 equation are most suitable for the calculation of the compressibility factor, although the Dranchuk-Purvis-Robinsonian Hall-Yarborough method is the most suitable for the calculation of the compressibility factor. However, the requirements for the known conditions of gases are higher than those for the above five empirical formulas, so when the known conditions do not satisfy the calculation, The application of these two methods is not as simple and convenient as the empirical formula. The average relative error of natural gas compression factor calculation software compiled by Microsoft Visual Basic 6.0 can meet the engineering requirements. Subsequently, the known gas components and compressibility factors are obtained. The compressibility factor of two gas samples is calculated by AGA8-92DC equation. To determine whether the AGA8-92DC equation is suitable for calculating the compressibility factors of these two gas samples. The accuracy of using AGA8-92DC equation to calculate the low and medium pressure carbon-rich gas reservoirs in the later stage of pipeline gas development can still meet the requirements. When calculating the compressibility factor coefficients of acidic gases such as H _ 2S, the compressibility coefficient calculated by the AGA _ 8-92DC equation is similar to that calculated by the AGA _ 8-92DC equation. Compared with the actual measured values, At each pressure value, the calculated value is larger than the measured value, and the average relative error is too large. Therefore, the AGA8-92DC equation is not suitable for calculating the compressibility factor coefficients of gases containing acid components such as H _ 2S. Finally, the volume flow rate of gas under pipeline conditions is calculated by using the natural gas compression factor calculation method combined with the Berges-Brier method. The Reynolds number and pressure drop are calculated with an error of 8.15, which meets the engineering requirements, and the calculated pressure drop error is less than Z value 1.
【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】：TE832.3

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