本文選題：裂縫性氣藏 + 高含硫��； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：在高含硫裂縫性氣藏的開發(fā)過程中,由于地層溫度壓力的變化使得元素硫從氣體中析出并沉積,導(dǎo)致氣藏物性參數(shù)如孔隙度、滲透率等參數(shù)的變化,這些物性參數(shù)的變化反過來又影響氣體的滲流,最終影響氣藏的開采效率。 目前高含硫裂縫性氣藏硫沉積預(yù)測研究較少,而且硫沉積預(yù)測模型的研究不夠完善,大多數(shù)預(yù)測模型存在不合理的假設(shè)條件,不能反應(yīng)實(shí)際地層條件的變化,為了準(zhǔn)確預(yù)測高含硫裂縫性氣藏硫沉積對儲(chǔ)層的傷害以及氣井產(chǎn)能的影響,在硫沉積機(jī)理研究的基礎(chǔ)上,針對目前普遍采用的硫飽和度預(yù)測模型進(jìn)行了改進(jìn),建立了考慮氣藏物性參數(shù)及流體參數(shù)隨壓力變化,非達(dá)西流以及應(yīng)力敏感影響的硫飽和度預(yù)測模型。針對高含硫裂縫性氣藏,改進(jìn)了考慮雙重介質(zhì)滲流規(guī)律的硫沉積預(yù)測模型,并且分析了裂縫參數(shù)及生產(chǎn)參數(shù)對硫沉積的影響。針對地層溫度較高,元素硫析出以液態(tài)的形式在地層中與天然氣形成氣-液態(tài)硫兩相滲流,建立了氣-液硫滲流數(shù)學(xué)模型,數(shù)值模擬研究了液態(tài)硫?qū)饩a(chǎn)能的影響。通過以上模型的建立以及實(shí)例分析完善了高含硫氣藏硫沉積預(yù)測模型,提高了現(xiàn)有硫沉積預(yù)測模型的預(yù)測精度,得到了以下結(jié)論： (1)通過模型對比發(fā)現(xiàn)Roberts模型過低估計(jì)了硫沉積的速度,而改進(jìn)的模型考慮了非達(dá)西流與應(yīng)力敏感的影響以及和壓力相關(guān)的參數(shù)的變化,使計(jì)算的結(jié)果更準(zhǔn)確更具有實(shí)際意義。 (2)在硫沉積預(yù)測模型中應(yīng)將儲(chǔ)層的應(yīng)力敏感考慮進(jìn)去,較強(qiáng)的儲(chǔ)層應(yīng)力敏感會(huì)導(dǎo)致硫沉積的速度加快,氣井的生產(chǎn)時(shí)間也會(huì)相應(yīng)縮短。 (3)與壓力相關(guān)參數(shù)的變化對硫沉積的影響可以歸結(jié)為壓力變化的影響,壓力在近井地帶變化巨大,因此模型中與壓力相關(guān)的參數(shù)必須對應(yīng)此處的壓力來計(jì)算。儲(chǔ)層的物性越差,發(fā)生硫堵的可能性就越大,發(fā)生的時(shí)間也越早。 (4)硫沉積污染半徑會(huì)隨著產(chǎn)量和生產(chǎn)時(shí)間的增加而增加,給出了有硫沉積污染情況下的氣井產(chǎn)量公式,氣井產(chǎn)量隨著含硫飽和度的升高而迅速降低。 (5)針對高含硫裂縫性氣藏,裂縫開度越大,硫沉積的速度越慢；裂縫高度越大,硫沉積的速度越慢；裂縫壁面接觸面積越小,硫沉積的速度越慢。 (6)針對液態(tài)硫的情況,當(dāng)元素硫析出并以液態(tài)的形式與天然氣形成氣液兩相流時(shí),氣井穩(wěn)產(chǎn)時(shí)間縮短并且最終累產(chǎn)氣量下降,液硫流動(dòng)能力越差對氣井產(chǎn)能影響越大。
[Abstract]:During the development of fractured gas reservoirs with high sulfur content, the variation of formation temperature and pressure makes elemental sulfur precipitate and deposit from the gas, which results in the change of physical parameters such as porosity and permeability of gas reservoirs. The change of these physical parameters in turn affects the gas percolation and ultimately the recovery efficiency of the gas reservoir. At present, there are few researches on the prediction of sulfur deposition in fractured gas reservoirs with high sulfur content, and the research on the prediction model of sulfur deposition is not perfect. Most of the prediction models have unreasonable assumptions and cannot reflect the change of actual formation conditions. In order to accurately predict the effect of sulfur deposition on reservoir damage and gas well productivity in high sulfur fractured gas reservoirs, the prediction model of sulfur saturation, which is widely used at present, is improved on the basis of the study of sulfur deposition mechanism. A prediction model of sulfur saturation considering the effects of pressure, non-Darcy flow and stress sensitivity on the physical and fluid parameters of gas reservoir is established. The prediction model of sulfur deposition considering the seepage law of double media is improved for the fractured gas reservoirs with high sulfur content, and the influence of fracture parameters and production parameters on sulfur deposition is analyzed. In view of the high formation temperature, elemental sulfur precipitates form gas-liquid sulfur two-phase percolation with natural gas in the form of liquid state, a mathematical model of gas-liquid sulfur percolation is established, and the effect of liquid sulfur on gas well productivity is numerically simulated. Through the establishment of the above model and the analysis of examples, the prediction model of sulfur deposition in high sulfur gas reservoir is improved, and the prediction accuracy of the existing sulfur deposition prediction model is improved, and the following conclusions are obtained: 1) it is found that the Roberts model overestimates the velocity of sulfur deposition, while the improved model takes into account the influence of non-Darcy flow on stress sensitivity and the change of pressure-related parameters, which makes the results more accurate and practical. 2) the stress sensitivity of the reservoir should be taken into account in the prediction model of sulfur deposition. The strong stress sensitivity of the reservoir will lead to the acceleration of sulfur deposition speed, and the production time of gas wells will be shortened accordingly. 3) the influence of pressure related parameters on sulfur deposition can be attributed to the pressure change. The pressure varies greatly in the near well zone, so the pressure-related parameters in the model must be calculated in accordance with the pressure here. The worse the reservoir physical property, the greater the probability of sulfur plugging and the earlier the occurrence time. 4) the radius of sulfur deposition pollution will increase with the increase of production rate and production time. The formula of gas well production under the condition of sulfur deposition pollution is given, and the gas well output decreases rapidly with the increase of sulfur saturation. 5) for the fractured gas reservoirs with high sulfur content, the larger the fracture opening, the slower the sulfur deposition rate, the smaller the contact area of the fracture wall, the slower the sulfur deposition rate. 6) for liquid sulfur, when elemental sulfur precipitates and forms gas-liquid two-phase flow with natural gas in the form of liquid state, the stable production time of gas well is shortened and the final cumulative gas production decreases. The worse the flowing capacity of liquid sulfur is, the greater the productivity of gas well is.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE328

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