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中文摘要：
超临界CO2钻井技术具有破岩门限压力低和破岩速度快等特点，并能有效控制井底压力、保护储层、提高渗透率，进而提高采收率。通过对微小井眼径向水平井钻井系统特点的分析，结合超临界CO2能够降低管内摩阻、可以注入压力以及在井底超临界CO2状态摩阻下易于在地层内前行等特点，分析了超临界CO2微小井眼径向水平井钻井技术的可行性、技术优势及应用前景。分析结果表明，微小井眼径向水平井钻井技术可使死井复活，能扩大泄油面积，提高单井油气产量，降低钻井成本；超临界CO2微小井眼径向水平井钻井技术不仅可以提高钻井速度，而且能够降低破岩所需的喷射压力，是未来钻井技术重要的发展方向。
英文摘要：
Supercritical CO2 drilling technology is characterized by low rock-breaking threshold pressure and fast rock-breaking speed. It can effectively control the bottomhole pressure, protect the reservoir and increase the perme- ability so as to improve the recovery rate. The paper analyzes the feature of the radial horizontal drilling system in micro holes, referring to the characteristics of supercritical CO2 , such as reduction of internal pipe friction, pres- sure injection and smooth movement in the formation It analyzes the feasibility, technological advantage and appli- cation prospect of supercritical CO2 micro hole radial horizontal drilling technology. The analysis shows that the tech- nology can make dead wells come back to life, increase oil drainage area, increase single-well oil-gas production and reduce the drilling cost. The technology cannot only improve the drilling speed, hut also reduce the jetting pres- sure needed by rock-breaking. It is an important development orientation for future drilling technology.
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