CAJ | 학술논문

当温度和压力分别达到31．10℃、7．38 MPa及以上时，CO2成为超临界状态，超临界CO2具有类似于液体的密度，而其粘度又比空气和氮气大，可以驱动井下动力钻具旋转破岩，并携带岩屑，形成超临界CO2钻井技术。超临界CO2钻井具备破岩速度快、油气层保护好、驱替效率高等优势，对于非常规油气藏开发具有明显优势。超临界CO2钻井与连续管钻井技术相结合，应用于压力欠平衡钻井和压力衰竭地层前景广阔。介绍了超临界CO2物理特征、超临界CO2钻井技术流程及其技术优势，最后阐述了超临界CO2钻井技术的研究进展及发展趋势。
당온도화압력분별체도31．10℃、7．38 MPa급이상시，CO2성위초림계상태，초림계CO2구유유사우액체적밀도，이기점도우비공기화담기대，가이구동정하동력찬구선전파암，병휴대암설，형성초림계CO2찬정기술。초림계CO2찬정구비파암속도쾌、유기층보호호、구체효솔고등우세，대우비상규유기장개발구유명현우세。초림계CO2찬정여련속관찬정기술상결합，응용우압력흠평형찬정화압력쇠갈지층전경엄활。개소료초림계CO2물리특정、초림계CO2찬정기술류정급기기술우세，최후천술료초림계CO2찬정기술적연구진전급발전추세。
When the temperature and pressure are higher than 31.10℃and 7.38MPa respectively, CO2 becomes into su-percritical state, the density of supercritical CO2 is similar to that of liquid, but the viscosity is higher than that of air and nitrogen gas, so it can drive the down-hole motor working and carry the cuttings out of the wellbore, which comes into being supercritical CO2 drilling technology.Supercritical CO2 drilling technology has the advantages of fast rock breaking speed, good gas and oil protection and high displacement efficiency, especially has the obvious advantages in the unconventional oil and gas reservoirs development.There are broad prospects for the application of combination of supercritical CO2 drilling and coiled tubing drilling technology in the pressure under balance drilling and pressure depletion formation.The paper in-troduces the supercritical CO2 technology about its physical characteristics, drilling process and the technical advantages as well as the related research progress and development trend.