超临界CO_2钻井与未来钻井技术发展

超临界CO2钻井技术是近10 a来发展起来的一项新型钻井技术,与常规钻井技术相比,它具有较快的钻井速度,而且超临界CO2喷射破岩门限压力也较低,同时,超临界CO2流体具有较好的井眼清洁能力,因此受到了国内外专家的广泛关注。分析了超临界CO2流体的物理性质,从不同角度阐述了超临界CO2钻井的特点及优势,最后,结合中国未来石油勘探开发趋势,详细剖析了超临界CO2连续油管钻井、超临界CO2小井眼微小井眼钻井、超临界CO2超短半径水平井和辐射水平井钻井技术的特点。这些技术将成为中国特殊油气藏的主要钻井方式,也是未来钻井发展的一个重要方向。

Supercritical carbon dioxide drilling and the development of future drilling technology

Supercritical carbon dioxide drilling technology is a new drilling technology developed over the last decade.Compared with conventional drilling,it has a higher rate of penetration,lower threshold pressure of breaking rock,is capable of hole cleaning,therefore has received much attention from home and foreign experts.This paper analyzes the physical properties of supercritical CO 2 fluid,demonstrates the characteristics and advantages of supercritical CO 2 drilling from different perspectives,and finally,in combination with the future trend of oil exploration and development in China,scrutinizes the technical features of supercritical CO 2 drilling with coiled tubing,for slim hole and micro-hole,and for short radius horizontal well and radial horizontal well.These techniques will become a predominant drilling technology for special oil and gas reservoirs in China,and present an important development trend of drilling technology.