本文關(guān)鍵詞：高含硫氣藏氣—液硫滲流規(guī)律研究　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高含硫氣藏 液態(tài)硫 兩相滲流 滲流規(guī)律 數(shù)學(xué)模型

【摘要】：高含硫氣藏在我國四川盆地分布廣泛。在高含硫氣藏的開發(fā)過程中,由于地層壓力的下降,元素硫在含硫氣體中的溶解度降低,元素硫從氣體中析出并沉積,且在高溫條件下以液態(tài)的形式存在于地層孔隙中,液硫的沉積會增大滲流阻力,降低地層孔隙介質(zhì)的滲流能力,當(dāng)液硫飽和度達(dá)到并超過其臨界流動飽和度時,地層中就會形成氣-液硫兩相滲流,最終影響高含硫氣藏的開采效率。目前國內(nèi)外學(xué)者對于高含硫氣藏中硫的析出主要集中在固態(tài)硫?qū)Φ貙涌紫兜膫碚撃Ｐ脱芯可?而對于液硫的沉積運移研究較少,考慮液硫沉積對產(chǎn)能的影響的研究更少。因此,本文在分析了高含硫氣體與液硫物性參數(shù)、液硫的沉積運移機理以及對氣相滲透率的傷害的基礎(chǔ)上,建立了高含硫氣藏液硫飽和度計算模型,并根據(jù)實例計算進行了影響因素分析。在現(xiàn)有的實驗設(shè)備基礎(chǔ)上改進研發(fā)了一套高溫高壓氣-液硫滲流實驗裝置,測定了氣-液硫相對滲透率曲線并分析了溫度和應(yīng)力敏感對相對滲透率的影響。根據(jù)液硫從含硫氣體中的析出運移機理,推導(dǎo)建立了氣-液硫滲流數(shù)學(xué)模型并求解�；谏鲜鲅芯康玫揭韵聨c結(jié)論:(1)高含硫氣藏氣體物性參數(shù)由于酸性氣體的存在而需要校正,建立的硫飽和度預(yù)測模型考慮了非達(dá)西流與應(yīng)力敏感的影響,使液硫飽和度計算結(jié)果更準(zhǔn)確。(2)對實例氣井巖心進行了應(yīng)力敏感性實驗,實驗結(jié)果表明:基質(zhì)巖心應(yīng)力敏感為中等偏弱。實驗測定了氣-液硫兩相相對滲透率曲線,結(jié)果表明:液硫臨界流動飽和度較高,氣-液硫兩相共滲區(qū)較窄。(3)研究了溫度與應(yīng)力敏感對相滲曲線的影響,結(jié)果表明:溫度與應(yīng)力敏感對氣相相對滲透率的影響比較明顯,氣相滲透率降低,等滲點左下移。溫度和應(yīng)力敏感對液硫相對滲透率影響大不。(4)根據(jù)元素硫從含硫氣體中析出并以液態(tài)的形式與含硫天然氣形成氣液兩相滲流的情況,推導(dǎo)建立了氣-液硫滲流數(shù)值模型并求解,通過編程模擬研究發(fā)現(xiàn):液硫沉積使氣井穩(wěn)產(chǎn)年限縮短、累產(chǎn)氣量下降,液硫流動能力越差對氣井產(chǎn)能影響越大。
[Abstract]:High sulfur gas reservoirs are widely distributed in Sichuan Basin of China. During the development of high sulfur gas reservoirs, the solubility of elemental sulfur in sulfur gas decreases due to the decrease of formation pressure, and elemental sulfur is precipitated and deposited from gases. At high temperature, liquid state exists in the formation pore, the deposition of liquid sulfur will increase the percolation resistance and reduce the percolation ability of the formation pore medium, when the liquid sulfur saturation reaches and exceeds its critical flow saturation. The gas-liquid sulfur two-phase percolation will be formed in the formation. At present, domestic and foreign scholars mainly focus on the theoretical model of the formation pore damage caused by solid sulfur. However, there are few researches on the deposition and migration of liquid sulfur, even less on the effect of liquid sulfur deposition on productivity. Therefore, the physical properties of high sulfur gas and liquid sulfur are analyzed in this paper. On the basis of sedimentary migration mechanism of liquid sulfur and damage to gas permeability, a calculation model of liquid sulfur saturation in high sulfur gas reservoir is established. On the basis of the existing experimental equipment, a set of high-temperature and high-pressure gas-liquid sulfur seepage experimental equipment was developed. The relative permeability curves of gas-liquid sulfur were measured and the effects of temperature and stress sensitivity on the relative permeability were analyzed. The mathematical model of gas-liquid sulfur percolation is established and solved. Based on the above research, the following conclusions are obtained: 1) the gas physical properties of high sulfur gas reservoirs need to be corrected because of the presence of acid gas. The influence of non-Darcy flow and stress sensitivity is taken into account in the prediction model of sulfur saturation, which makes the calculation results of liquid sulfur saturation more accurate. The experimental results show that the stress sensitivity of matrix core is moderately weak. The relative permeability curves of gas-liquid sulfur phase are measured experimentally. The results show that the critical flow saturation of liquid sulfur is high. The effect of temperature and stress sensitivity on the phase permeability curve is studied. The results show that the influence of temperature and stress sensitivity on gas phase relative permeability is obvious and the gas phase permeability decreases. The influence of temperature and stress sensitivity on the relative permeability of liquid sulfur is not. 4) according to the condition that elemental sulfur is precipitated from sulfur-containing gas and formed in liquid form with sulfur-bearing natural gas, gas-liquid two-phase seepage is formed. The numerical model of gas-liquid sulfur percolation is established and solved. It is found that liquid sulfur deposition shortens the stable production life of gas wells, decreases the cumulative gas production, and the worse the flowing capacity of liquid sulfur, the greater the effect on gas well productivity.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE312

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