本文選題：氣體滲流　切入點(diǎn)：有限導(dǎo)流垂直裂縫　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：水力壓裂是一種成熟而有效的增產(chǎn)增注措施。由于水力壓裂在油氣田生產(chǎn)中占有著極其重要的地位,所以一直受到廣大學(xué)者和油藏工程師們的重視。在低滲透和致密氣藏中,許多氣井不經(jīng)過水利壓裂不能得到工業(yè)氣流,不能進(jìn)行生產(chǎn)。由于天然氣壓縮性的變化影響非常大,所以不能使用微可壓縮假設(shè),導(dǎo)致控制方程具有非線性。即便采用擬函數(shù)方法能夠?qū)⑻烊粴鉂B流控制方程化簡為與微可壓縮流體的滲流控制方程同樣的形式,但方程中的擴(kuò)散系數(shù)項總是與壓力相關(guān)的,難以進(jìn)行精確的解析求解。對這些解析方法指導(dǎo)現(xiàn)場實際生產(chǎn)的可靠性進(jìn)行驗證是必須的。本文選擇Hall-Yarborough(1973)方法計算天然氣的壓縮因子,選擇Lee-Gonzalez-Eakin(1966)方法計算天然氣的粘度,用物質(zhì)平衡擬時間方法處理氣藏控制方程非線性,利用Laplace變換求解了矩形地層中任意位置處一口直井和有限導(dǎo)流垂直裂縫井的不穩(wěn)定滲流數(shù)學(xué)模型,并完成了井壁流量的相應(yīng)快速計算方法,給出了直井和有限導(dǎo)流垂直裂縫氣井的定流壓情況下的產(chǎn)量解析解實例計算。用Eclipse數(shù)值模擬軟件驗證了直井解析解與有限導(dǎo)流垂直裂縫井的解析解的準(zhǔn)確性。本文還分析了近井網(wǎng)格大小和時間步大小對普通直井?dāng)?shù)值模擬結(jié)果的影響,近井網(wǎng)格大小和裂縫兩端網(wǎng)格大小對有限導(dǎo)流垂直裂縫氣井?dāng)?shù)值模擬結(jié)果的影響,并討論了裂縫兩端局部加密對多裂縫井?dāng)?shù)值模擬的影響,給出了相對合理的普通直井和有限導(dǎo)流垂直裂縫井的數(shù)值模擬方法。分析研究了裂縫的導(dǎo)流能力和穿透比對不同油藏產(chǎn)量的影響。在文章的最后分析研究了氣藏滲透率和裂縫導(dǎo)流能力對最優(yōu)穿透比的影響規(guī)律,氣藏滲透率和裂縫穿透比對最優(yōu)導(dǎo)流能力的影響規(guī)律。
[Abstract]:Hydraulic fracturing is a mature and effective measure for increasing production and injection. Because hydraulic fracturing plays an extremely important role in the production of oil and gas fields, it has always been attached importance to by scholars and reservoir engineers. Many gas wells can't get industrial airflow without hydraulic fracturing and can't be produced. Because the change of the compressibility of natural gas is so great, we can't use the supposition of micro-compressibility. The governing equation is nonlinear. Even if the governing equation of natural gas seepage can be simplified to the same form as the governing equation of micro-compressible fluid, the diffusion coefficient term in the equation is always related to pressure. It is necessary to verify the reliability of these analytical methods to guide the actual production. In this paper, we select Hall-Yarborough 1973method to calculate the compressibility factor of natural gas, and Lee-Gonzalez-Eakin1966) method to calculate the viscosity of natural gas. The nonlinear governing equation of gas reservoir is treated by the method of material equilibrium quasi time, and the unsteady seepage mathematical model of a straight well and a vertical fracture well with finite diversion flow at any position in rectangular formation is solved by Laplace transform. The corresponding fast calculation method of wellbore flow is completed. An example calculation of analytical solution of production under the condition of constant flow pressure of straight well and finite diversion vertical fractured gas well is given. The accuracy of analytical solution of straight well and finite diversion vertical fractured well is verified by Eclipse numerical simulation software. The influence of the grid size and time step size of the near well on the numerical simulation results of the ordinary vertical well is also analyzed. The effect of near well mesh size and fracture end mesh size on the numerical simulation results of finite diversion vertical fracture gas wells is discussed, and the effect of local infilling at both ends of fractures on the numerical simulation of multi-fracture wells is discussed. A relatively reasonable numerical simulation method for normal straight wells and finite conductivity vertical fractured wells is given. The effects of fracture conductivity and penetration ratio on the production of different reservoirs are analyzed. At the end of this paper, the gas reservoirs are analyzed and studied. The influence of permeability and fracture conductivity on the optimal penetration ratio, The effect of gas reservoir permeability and fracture penetration ratio on optimal flow conductivity.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE328

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 蘇玉亮;慕立俊;范文敏;李志文;高麗;;特低滲透油藏油井壓裂裂縫參數(shù)優(yōu)化[J];石油鉆探技術(shù);2011年06期

，

本文編號：1629264