發(fā)布時(shí)間：2021-01-15 17:03

　　目前,水力壓裂是油氣田優(yōu)化開發(fā)階段提高頁巖氣產(chǎn)量的重要科學(xué)方法。在本研究中,對(duì)裸眼及射孔完井儲(chǔ)層的應(yīng)力分布進(jìn)行了討論。在考慮烴類流體對(duì)井壁的作用力和壓裂液滲流的影響后,建立了射孔井井壁應(yīng)力場(chǎng)的分布模型。解釋了應(yīng)力集中產(chǎn)生的影響及注水井的應(yīng)力分布模型。利用該數(shù)學(xué)模型加上控制變量法,計(jì)算了井壁的切應(yīng)力、垂直應(yīng)力和最大周向應(yīng)力,為現(xiàn)場(chǎng)壓裂施工提供了理論依據(jù)。其次,利用數(shù)學(xué)模型描述了四種裂縫耦合模式以及其發(fā)生的判別條件。分析了裂縫交點(diǎn)處的應(yīng)力狀態(tài),計(jì)算了切應(yīng)力、法向應(yīng)力和接近角之間的關(guān)系。最后,通過ABAQUS有限元數(shù)值模擬軟件,分析了水力裂縫和天然裂縫在不同接進(jìn)近角度下裂縫的擴(kuò)展情況,驗(yàn)證了前人的理論成果,對(duì)現(xiàn)場(chǎng)施工具有一定的指導(dǎo)意義。 

【文章來源】：中國(guó)地質(zhì)大學(xué)(北京)北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：69 頁

【學(xué)位級(jí)別】：碩士

【文章目錄】：
Abstract
摘要
1 INTRODUCTION
    1.1 Research Purpose and Significance
    1.2 Local and International Research Status
        1.2.1 Research of Fracture Interaction in Shale Gas Reservoir
        1.2.2 Research of Crack Propagation Mechanism at Local and International
    1.3 Problems
    1.4 Research Content and Technical Route
        1.4.1 Research Contents
        1.4.2 Methodology
2 SHALE RESERVOIR PROPERTY ANALYSIS
    2.1 Shale Mineral Composition
    2.2 Mechanical Parameters of Shale
        2.2.1 Elastic Modulus and Poisson's Ratio of Shale
        2.2.2 Shale Fracture Pressure
        2.2.3 Cohesion and Internal Friction Angle of Shale
    2.3 Brittleness Evaluation of Shale
        2.3.1 Elastic Parameter Method
        2.3.2 Mineral Composition Method
    2.4 Summary of the Chapter
3 DISTRIBUTION OF STRESS FIELD IN RESERVOIR ROCK
    3.1 Rock Stress Analysis of Reservoir
    3.2 Stress Field Analysis of Open-hole Wellbore
        3.2.1 In-situ Stress Component Produces Wellbore Stress
        3.2.2 Compressive Stress of Rock Caused by Fluid in Wellbore
        3.2.3 Stress due to Seepage Loss of Fracturing Fluid
        3.2.4 Distribution of Stress Field around Open Hole Wellbore
    3.3 Distribution model of stress field around perforated wellbore
        3.3.1 Wellbore Stress Distribution in Perforated Wells
    3.4 Example calculation
    3.5 Summary of the chapter
4.INTERACTION OF HYDRAULIC AND NATURAL FRACTURES
    4.1 The Interaction Modes of Fractures
        4.1.1 Fracture Interaction mode1
        4.1.2 Fracture Interaction mode2
        4.1.3 Fracture Interaction mode3
        4.1.4 Fracture Interaction mode4
    4.2 Stress Analysis of Crack Intersection
        4.2.1 Stress State at the Intersection of the First Crack Coupling Mode
        4.2.2 Stress State at the Intersection of the Second Crack Coupling Mode
        4.2.3 Stress State at the Intersection of the Third Crack Coupling Mode
        4.2.4 Stress State at the Intersection of the Fourth Crack Coupling Mode
    4.3 Example Calculation
    4.4 Summary of the Chapter
5.CRACK PROPAGATION MODELING AND MODEL OPTIMIZATION
    5.1 Finite Eelement Simulation
        5.1.1 Establishment of Finite Element Model
        5.1.2 Grid Generation
        5.1.3 Apply Load and Calculations
        5.1.4 Model Results and Processing
    5.2 Analytical Results of Modeling
    5.3 Summary
6.CONCLUSION
ACKNOWLEDGEMENT
REFERENCES


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