【摘要】：實際開采過程中,一些氣井往往以復(fù)合工作制度進行生產(chǎn),為了研究這一生產(chǎn)動態(tài)過程,采用有限差分和半解析法求解復(fù)合工作制度下非齊次、非線性天然氣滲流數(shù)學(xué)模型。有限差分法單步長中對非線性系數(shù)(β)差分計算,循環(huán)計算內(nèi)邊界條件至收斂,以保證獲得高階精度的數(shù)值解。在實例計算中,數(shù)值解和半解析解的預(yù)測結(jié)果符合良好,相互印證,可精確預(yù)測出氣井從穩(wěn)產(chǎn)期到遞減期的產(chǎn)量、井底壓力和采收率等重要生產(chǎn)數(shù)據(jù)隨時間的變化規(guī)律。研究結(jié)果表明,當(dāng)產(chǎn)量遞減至經(jīng)濟極限產(chǎn)量時,在相同轉(zhuǎn)制壓力下,穩(wěn)產(chǎn)期的生產(chǎn)速度對采收率基本無影響,轉(zhuǎn)制壓力會在提高采收率的基礎(chǔ)上,有效延長穩(wěn)產(chǎn)期。生產(chǎn)速度和轉(zhuǎn)制壓力的合理設(shè)置可優(yōu)化氣井生產(chǎn)工作制度,為制訂開發(fā)方案提供理論依據(jù)。
[Abstract]:In the process of actual production, some gas wells are often produced under the compound working system. In order to study this production dynamic process, the finite difference and semi-analytical methods are used to solve the mathematical model of non-homogeneous and nonlinear natural gas seepage under the compound working system. In the single step finite difference method, the inner boundary condition of the finite difference method is calculated to converge for the nonlinear coefficient (尾) difference, so that the numerical solution with high order accuracy can be obtained. The prediction results of numerical solution and semi-analytical solution are in good agreement with each other and can accurately predict the variation law of production from stable production period to declining stage, bottom hole pressure and recovery factor with time. The results show that when the production decreases to the economic limit, under the same transition pressure, the production rate of the stable production period has no effect on the recovery basically, and the transition pressure will extend the stable production period effectively on the basis of improving the recovery efficiency. The reasonable setting of production speed and transition pressure can optimize the production system of gas wells and provide theoretical basis for the formulation of development plans.
【作者單位】： 中國地質(zhì)大學(xué)(北京);
【基金】：國家自然科學(xué)基金項目“深層異常高壓致密砂礫巖油藏衰竭開采滲流規(guī)律研究”(51674227)
【分類號】：TE332
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本文編號：2283924