本文關(guān)鍵詞： 天然氣 狀態(tài)方程 PVTx性質(zhì) 氣液相平衡　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：天然氣混合物可近似為C-H-O-N-S體系,主要含CH_4、C_2H_6、C_3H_8、CO_2、N_2,以及H_2S和SO_2(少量)。因此確定含硫天然氣流體混合物的壓力-體積-溫度-組成(PVTx)和氣液相平衡(VLE)性質(zhì),對(duì)于探討油氣來源、油氣儲(chǔ)運(yùn)和油氣開采具有重要的意義。同時(shí),含硫天然氣流體混合物的PVTx和VLE性質(zhì),也是油氣包裹體研究中確定捕獲溫度與捕獲壓力的基礎(chǔ)。通常確定流體PVTx和VLE性質(zhì)的方法有實(shí)驗(yàn)和熱力學(xué)計(jì)算模擬。由于實(shí)驗(yàn)數(shù)據(jù)的有限性,本文借助于最常用的有良好外延性的Helmholtz狀態(tài)方程,對(duì)流體混合物的PVTx和VLE性質(zhì)進(jìn)行預(yù)測(cè):在呂孟欣(2015)和Lemmon and Jacobsen(1999)熱力學(xué)模型的基礎(chǔ)上,依據(jù)對(duì)應(yīng)態(tài)原理和已有的實(shí)驗(yàn)數(shù)據(jù),建立了一個(gè)通用的含硫天然氣流體混合物(CH_4-C_2H_6-C_3H_8-N_2-CO_2-H_2S-SO_2)的Helmholtz自由能方程。該方程形式上是溫度、密度和組成的函數(shù),不僅形式簡(jiǎn)單、適用范圍寬廣,而且預(yù)測(cè)精度高,與實(shí)驗(yàn)數(shù)據(jù)精度相當(dāng)。方程中四個(gè)混合參數(shù)通過可靠的二元體系的PVTx和VLE數(shù)據(jù),采用非線性最小二乘法擬合得到。多元流體混合物的熱力學(xué)性質(zhì)的計(jì)算完全是預(yù)測(cè)性的。本方程適用于從三相點(diǎn)溫度和壓力到650K和2000 bar的溫度壓力范圍,預(yù)測(cè)的精度與kunz et al.(2007)建立的GERG-2008狀態(tài)方程的精度接近。采用國(guó)際上流行的計(jì)算語言Fortran95編寫整個(gè)狀態(tài)方程的計(jì)算程序。程序語言結(jié)構(gòu)簡(jiǎn)單,可以很方便地應(yīng)用于相應(yīng)體系的包裹體研究。
[Abstract]:The natural gas mixture can be approximated as a C-H-O-N-S system, consisting mainly of CHS 4C2H2H6 / C3H8S / CO2S / N2, as well as a small number of H2S and SO2S. Therefore, the properties of pressure-volume-temperature-composition PVTx and gas-liquid equilibrium VLEs of a mixture of sulfur-containing natural gas fluids are determined, and for the purpose of exploring the source of oil and gas, It is of great significance to store and transport oil and gas and produce oil and gas. At the same time, the PVTx and VLE properties of the fluid mixture containing sulfur natural gas, It is also the basis of determining the trapping temperature and pressure in the study of oil and gas inclusions. Usually, the methods of determining the properties of PVTx and VLE of fluid are experimental and thermodynamic simulation. Because of the limitation of experimental data, In this paper, with the aid of the most commonly used Helmholtz equation of state with good extrapolation, the PVTx and VLE properties of fluid mixtures are predicted: based on the thermodynamic models of Mengxin Lu 2015 and Lemmon and Jacobsen 1999), the corresponding state principle and the available experimental data are used. The Helmholtz free energy equation of a general sour natural gas fluid mixture, Ch _ 4-C _ s _ 2H _ 6-C _ _ _. The four mixed parameters in the equation pass through the PVTx and VLE data of the reliable binary system. The calculation of thermodynamic properties of multicomponent fluid mixtures is completely predictive. This equation is applicable to the temperature and pressure range from three-phase temperature and pressure to 650 K and 2000 bar. The accuracy of the prediction is close to that of the GERG-2008 equation of state established by kunz et al.2007). The calculation program of the whole equation of state is compiled by using the international popular computing language Fortran95. The structure of the program language is simple. It can be easily applied to the study of inclusions in the corresponding systems.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE31

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