本文選題：含硫氣藏　切入點(diǎn)：生產(chǎn)動(dòng)態(tài)預(yù)測(cè)　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：我國(guó)含硫氣藏資源豐富,對(duì)含硫氣藏的開發(fā)已經(jīng)成為獲得天然氣資源的重要途徑之一。在氣藏開發(fā)初期,通過對(duì)氣井進(jìn)行生產(chǎn)動(dòng)態(tài)預(yù)測(cè),可以得到生產(chǎn)數(shù)據(jù)隨時(shí)間的變化關(guān)系,為制定合理的氣藏開發(fā)方案、調(diào)整氣井工作制度提供依據(jù)。含硫氣藏在開發(fā)過程中存在硫沉積問題,而傳統(tǒng)的動(dòng)態(tài)預(yù)測(cè)方法沒有考慮硫沉積的影響,不能準(zhǔn)確的對(duì)含硫氣藏進(jìn)行預(yù)測(cè),因此建立適合于含硫氣藏的氣井生產(chǎn)動(dòng)態(tài)預(yù)測(cè)方法十分必要。本文首先對(duì)硫元素的溶解和沉積機(jī)理進(jìn)行研究。在此基礎(chǔ)上,建立了硫沉積預(yù)測(cè)模型和含硫氣井產(chǎn)能方程,從力學(xué)角度研究了硫顆粒在儲(chǔ)層中的運(yùn)移規(guī)律,分析了硫沉積和運(yùn)動(dòng)條件。通過理論推導(dǎo),分別從物質(zhì)平衡和數(shù)值模擬兩方面建立了氣井生產(chǎn)動(dòng)態(tài)預(yù)測(cè)方法,編寫了相應(yīng)軟件,并做了實(shí)例應(yīng)用。通過本文的研究,主要取得了以下成果:(1)通過對(duì)含硫氣藏中硫元素存在方式的研究,明確了硫元素在含硫氣藏中以物理溶解和物理沉積為主,得到了預(yù)測(cè)硫溶解度和含硫飽和度的定量計(jì)算方法。(2)推導(dǎo)了同時(shí)考慮硫沉積、啟動(dòng)壓力梯度和非達(dá)西滲流條件的直井、直井壓裂井、水平井的產(chǎn)能方程,得到了氣井產(chǎn)能隨含硫飽和度、裂縫寬度、水平段長(zhǎng)度的變化規(guī)律。(3)通過對(duì)硫顆粒的受力分析,得到了硫顆粒在儲(chǔ)層中運(yùn)移的臨界懸浮速度和臨界沖刷速度計(jì)算公式。(4)運(yùn)用物質(zhì)平衡原理,建立了不同類型含硫氣藏的物質(zhì)平衡方程,結(jié)合含硫氣井產(chǎn)能公式及井底壓力計(jì)算公式,得到了含硫氣井生產(chǎn)動(dòng)態(tài)方法。(5)針對(duì)含硫氣藏,分別建立了氣相和氣固兩相滲流數(shù)學(xué)模型,通過數(shù)學(xué)模型的離散建立數(shù)值模型,給出了模型求解方法。(6)利用VB6.0開發(fā)了一套可以應(yīng)用于含硫氣藏的氣井動(dòng)態(tài)預(yù)測(cè)軟件,并對(duì)軟件的算法進(jìn)行驗(yàn)證,取得較好的結(jié)果。對(duì)軟件進(jìn)行了實(shí)例應(yīng)用,得到了某含硫氣井的產(chǎn)氣量、井底壓力、地層平均壓力等參數(shù)隨生產(chǎn)時(shí)間的變化關(guān)系。
[Abstract]:There are abundant sulfur gas reservoirs in China, and the development of sulfur gas reservoirs has become one of the important ways to obtain natural gas resources.In the early stage of gas reservoir development, the relationship of production data with time can be obtained by predicting the production performance of gas wells, which provides the basis for formulating reasonable gas reservoir development plan and adjusting the working system of gas wells.Sulfur deposition exists in the development of sulfur-bearing gas reservoir, but the traditional dynamic prediction method does not consider the influence of sulfur deposition, so it can not accurately predict the sulfur-bearing gas reservoir.Therefore, it is necessary to establish a prediction method for production performance of gas wells suitable for sulfur gas reservoirs.In this paper, the mechanism of sulfur dissolution and deposition is studied.On this basis, the prediction model of sulfur deposition and productivity equation of sulfur-bearing gas wells are established, and the migration laws of sulfur particles in reservoirs are studied from the point of view of mechanics, and the conditions of sulfur deposition and movement are analyzed.Through theoretical derivation, the prediction method of gas well production performance is established from two aspects of material balance and numerical simulation, and the corresponding software is compiled, and an example is given.Through the research in this paper, the following results are obtained: 1) through the study of the existence mode of sulfur element in the sulfur-bearing gas reservoir, it is clear that the main sulfur element is physical dissolution and physical deposition in the sulfur-bearing gas reservoir.A quantitative calculation method for predicting sulfur solubility and sulfur saturation is obtained. The productivity equations of vertical wells, fracturing wells and horizontal wells with sulfur deposition, starting pressure gradient and non-Darcy percolation conditions are derived.The variation of gas well productivity with sulfur saturation, fracture width and horizontal section length is obtained.The formulas for calculating the critical suspension velocity and critical scour velocity of sulfur particles in the reservoir are obtained. Based on the principle of mass balance, the material balance equations of different types of sulfur-bearing gas reservoirs are established.Combined with the productivity formula and bottom hole pressure calculation formula of sulfur-bearing gas wells, the production performance method of sulfur-bearing gas wells is obtained. The mathematical models of gas-phase and gas-solid two-phase percolation flow are established respectively for sulfur-bearing gas reservoirs, and the numerical models are established through the discretization of mathematical models.The method of model solving is given. (1) A set of prediction software for gas well performance is developed by using VB6.0, and the algorithm of the software is verified and good results are obtained.The application of the software shows that the gas production, bottom hole pressure and average formation pressure of a sulfur-bearing gas well vary with production time.
【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】：2015
【分類號(hào)】：TE331

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

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