本文選題：火山巖氣藏　切入點：裂縫-孔隙型　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：火山巖天然氣藏作為一個新的勘探開發(fā)領(lǐng)域,其天然氣資源豐富、勘探開發(fā)前景廣闊。目前我國己探明火山巖天然氣地質(zhì)儲量達數(shù)千億立方米,儲量規(guī)模屬世界最大。在當(dāng)前國家能源需求迅速增長的背景下,火山巖天然氣資源的開發(fā),對于保障國家能源安全、優(yōu)化能源結(jié)構(gòu)、改善環(huán)境具有重大意義。 與常規(guī)砂巖氣藏相比,火山巖氣藏儲層具有較為復(fù)雜的儲滲模式,發(fā)育孔、洞、縫多重介質(zhì),從而決定了火山巖儲層的儲層物性差、滲流機理復(fù)雜,且缺乏適合于火山巖氣藏復(fù)雜滲流特性的產(chǎn)能評價模型。本文綜合運用現(xiàn)代滲流力學(xué)、油氣藏工程、數(shù)學(xué)物理方法、計算機程序設(shè)計等學(xué)科知識,研究在不同介質(zhì)條件下,水平井及壓裂水平井不穩(wěn)態(tài)滲流理論、產(chǎn)能評價模型,為火山巖氣藏開發(fā)提供理論依據(jù)。 本文完成的主要工作如下： (1)對國內(nèi)外文獻進行了大量調(diào)研,總結(jié)了火山巖氣藏滲流機理,地質(zhì)特征,儲層特征及開采難點,同時總結(jié)了常規(guī)水平井和壓裂水平井的產(chǎn)能評價方法。 (2)從火山巖氣藏的基本滲流理論出發(fā),考慮了井筒儲集和表皮效應(yīng)的影響,建立裂縫—孔隙型火山巖氣藏水平井不穩(wěn)態(tài)滲流數(shù)學(xué)模型,運用拉普拉斯變換、傅里葉變換對模型進行了求解,得出了各種外邊界條件下滲流模型的拉普拉斯空間解,繪制了產(chǎn)能特征曲線,對產(chǎn)能特征曲線進行了流動階段的劃分,分析了各參數(shù)對曲線動態(tài)的影響。 (3)建立了裂縫—孔隙型火山巖氣藏有限導(dǎo)流壓裂水平井不穩(wěn)態(tài)滲流模型,在模型中引入了裂縫離散化機制,采用半解析法求解滲流數(shù)學(xué)模型,并繪制了產(chǎn)能特征曲線,對產(chǎn)能特征曲線進行了流動階段的劃分,分析了各參數(shù)對曲線形態(tài)的影響。 (4)建立了裂縫—孔隙型火山巖氣藏?zé)o限導(dǎo)流壓裂水平井不穩(wěn)態(tài)滲流模型,考慮了人工裂縫內(nèi)的流動阻力,采用半解析法求解滲流數(shù)學(xué)模型,并進行了產(chǎn)能特征曲線對比和分析。 (5)運用建立的火山巖氣藏產(chǎn)能模型對實例井進行了擬合分析,應(yīng)用結(jié)果表明本文所建立的模型理論正確、方法可行。
[Abstract]:As a new field of exploration and development, volcanic gas reservoirs are rich in natural gas resources and have broad prospects for exploration and development. At present, hundreds of billions of cubic meters of volcanic natural gas reserves have been proved in China. The scale of reserves is the largest in the world. Under the background of the rapid growth of national energy demand, the exploitation of volcanic natural gas resources is of great significance to ensure the national energy security, optimize the energy structure and improve the environment. Compared with conventional sandstone gas reservoirs, volcanic gas reservoirs have a more complex reservoir and permeability model, developing pores, cavities and fractures with multiple media, which determines that the reservoir physical properties of volcanic reservoirs are poor, and the percolation mechanism is complex. There is a lack of productivity evaluation model suitable for the complex percolation characteristics of volcanic gas reservoirs. In this paper, the knowledge of modern seepage mechanics, reservoir engineering, mathematical and physical methods, computer programming and so on is used to study the different media conditions. The unsteady percolation theory and productivity evaluation model of horizontal wells and fracturing horizontal wells provide theoretical basis for the development of volcanic gas reservoirs. The main work of this paper is as follows:. 1) A large number of literatures at home and abroad have been investigated, and the percolation mechanism, geological characteristics, reservoir characteristics and production difficulties of volcanic gas reservoirs have been summarized. At the same time, the productivity evaluation methods of conventional horizontal wells and fracturing horizontal wells have been summarized. Based on the basic percolation theory of volcanic gas reservoir, considering the influence of wellbore reservoir and skin effect, the mathematical model of unsteady seepage in horizontal well of fractured and porous volcanic gas reservoir is established, and Laplace transformation is used. Fourier transform is used to solve the model. The Laplace space solution of seepage model under various external boundary conditions is obtained. The productivity characteristic curve is drawn, and the productivity characteristic curve is divided into flow stages. The influence of the parameters on the curve dynamics is analyzed. In this paper, the unsteady seepage model of fractured porous volcanic gas reservoir with finite conductivity fracturing is established. The fracture discretization mechanism is introduced into the model, and the mathematical model of seepage flow is solved by semi-analytical method, and the characteristic curve of productivity is drawn. The characteristic curve of productivity is divided into flow stages and the influence of each parameter on the shape of the curve is analyzed. In this paper, an unsteady seepage model of fractured porous volcanic gas reservoir with infinite diversion fracturing is established. Considering the flow resistance in artificial fracture, the mathematical model of seepage is solved by semi-analytical method, and the characteristic curve of productivity is compared and analyzed. 5) the model of volcanic gas reservoir is used to fit and analyze the example well. The application results show that the theory of the model is correct and the method is feasible.
【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】：TE328

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