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PG主體氣藏開發(fā)狀況研究及穩(wěn)產(chǎn)技術(shù)對策

發(fā)布時間:2018-11-10 14:31
【摘要】:隨著天然氣在全球能源所占比例越來越高,高含硫氣藏的開發(fā)也變得越來越重要,同時我國四川盆地高含硫氣藏資源也十分豐富,探明高含硫天然氣累積儲量已經(jīng)超過6300×108m3,約占探明天然氣總儲量的1/6。然而我國高含硫碳酸鹽巖氣藏開發(fā)技術(shù)尚不成熟,以PG氣田為代表的高含硫碳酸鹽巖氣藏具有H2S含量高、平面與縱向上分布不均,縱向上產(chǎn)層復(fù)雜、儲層非均質(zhì)強,儲集類型多為裂縫—孔隙型(孔、縫、洞),儲集空間復(fù)雜,相態(tài)復(fù)雜及存在相變,部分生產(chǎn)井處于水體上方,受水侵影響嚴重等特點,因此其生產(chǎn)動態(tài)規(guī)律評估具有一定難度,為了能夠高效開采,為PG主體氣藏的開發(fā)提供技術(shù)支持和借鑒,需要對氣井產(chǎn)能評價方法做深入研究。 氣藏壓力變化是氣藏工程計算的重要依據(jù),從氣藏壓力計算入手,應(yīng)用M-B方法計算PG氣田的井底流壓,利用氣井生產(chǎn)數(shù)據(jù),結(jié)合物質(zhì)平衡法計算了氣井地層壓力。從硫的溶解度模型出發(fā),利用實測資料擬合Chrastil模型經(jīng)驗公式和相平衡溶解度計算得到了適合于PG氣藏含硫氣體溶解度預(yù)測公式,并且建立了含硫飽和度的計算公式。 運用生產(chǎn)動態(tài)數(shù)據(jù),評價了PG氣田產(chǎn)水情況,以及水侵對氣井產(chǎn)能的影響,建立了PG氣田的產(chǎn)能評價方法:一點法,改進一點法,二項式產(chǎn)能法,物質(zhì)平衡和產(chǎn)能結(jié)合法。物質(zhì)平衡和產(chǎn)能結(jié)合法考慮硫沉積對氣井產(chǎn)能的影響,該方法是一個動態(tài)計算產(chǎn)能的過程,在考慮硫沉積對滲透率的影響大小基礎(chǔ)上計算了硫沉積對氣井產(chǎn)能影響大小。運用產(chǎn)能計算方法對PG主體37口生產(chǎn)井進行了產(chǎn)能評價,并通過結(jié)果對比得出了最適用于PG氣田的產(chǎn)能計算方法。同時運用采氣曲線法,節(jié)點分析法和經(jīng)驗法對氣井進行了配產(chǎn),應(yīng)用油藏影響函數(shù)法,流動物質(zhì)平衡法,采氣曲線法對氣藏單井動態(tài)儲量進行了評估。針對氣藏在生產(chǎn)過程中存在的問題,通過控水采氣、封堵產(chǎn)水層、酸化解堵等幾個方面提出了穩(wěn)產(chǎn)技術(shù)對策,討論了氣田穩(wěn)產(chǎn)年限并對優(yōu)化方案進行了評價。
[Abstract]:With the increasing proportion of natural gas in the global energy, the development of high sulfur gas reservoir becomes more and more important. At the same time, the resources of high sulfur gas reservoir in Sichuan Basin are very rich, and the proven accumulative reserves of high sulfur gas have exceeded 6300 脳 108 m3. It accounts for about a sixth of the total proven natural gas reserves. However, the development technology of high sulfur carbonate gas reservoir in China is not mature. The high sulfur carbonate gas reservoir represented by PG gas field is characterized by high H 2S content, uneven distribution in plane and longitudinal, complex vertical production layer and strong heterogeneity of reservoir. The reservoir types are mostly fracture-pore type (pore, fracture, cavity), the reservoir space is complex, the phase state is complex and phase transition exists, and some production wells are above the water body, which are seriously affected by water invasion, etc. Therefore, it is difficult to evaluate its production performance law. In order to be able to produce efficiently and provide technical support and reference for the development of PG main gas reservoir, it is necessary to make a deep study on the method of gas well productivity evaluation. Gas reservoir pressure variation is an important basis for gas reservoir engineering calculation. Starting with gas reservoir pressure calculation, M-B method is used to calculate bottom hole flow pressure of PG gas field, and gas well production data is used to calculate gas well formation pressure combined with material balance method. Based on the sulfur solubility model, the empirical formula of Chrastil model and the calculation of phase equilibrium solubility are used to fit the empirical formula of Chrastil model and the formula for predicting the solubility of sulfur containing gas in PG gas reservoir is obtained, and the calculation formula of sulfur saturation is established. Based on the production dynamic data, this paper evaluates the water production situation of PG gas field and the influence of water invasion on gas well productivity, and establishes the productivity evaluation methods of PG gas field: one point method, improved one point method, binomial productivity method, material balance and productivity combination method. The influence of sulfur deposition on gas well productivity is considered by the combination of material balance and productivity. This method is a process of dynamic calculation of productivity. The influence of sulfur deposition on gas well productivity is calculated on the basis of considering the influence of sulfur deposition on permeability. The productivity evaluation of 37 production wells in the main body of PG is carried out by using productivity calculation method, and the most suitable productivity calculation method for PG gas field is obtained by comparing the results. At the same time, gas recovery curve method, node analysis method and empirical method are used to produce gas wells. The reservoir influence function method, flow material balance method and gas recovery curve method are used to evaluate the single well dynamic reserves of gas reservoir. In view of the problems existing in the production process of gas reservoirs, this paper puts forward the technical countermeasures of stabilizing production by controlling water and gas production, plugging water producing layers and removing water plugging by acid, discusses the years of stable production of gas fields and evaluates the optimization scheme.
【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】:2015
【分類號】:TE37

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