Key Technologies for Cementing of Deep and Ultra-deep Oil and Gas Wells
Deep and ultra-deep reservoirs,of which the depth exceeds 9,000 meters,are important areas for in-creasing oil and gas storage and production.For the upper large wellbore section cementing operation in deep and ultra-deep well,the key technical issues are safe casing running and high displacement rate;for the lower section are HT,HP,narrow safety density window and narrow annular space.Through continuous technological research and practice,significant progress has been made in the cementing technology of deep and ultra-deep wells,espe-cially in the large size and large tonnage casing running technology in large borehole,high displacement rate ce-menting,fine pressure control cementing technology with narrow density window,high-temperature resistant ce-menting cement slurry and spacer,HTHP cementing supporting tools and supporting technology for improving ce-menting integrity.This cementing technology has been promoted and applied in deep and ultra-deep well such as Sichuan,Tarim,Junggar,Bohai Bay,and Qaidam in China with remarkable application effect in PS6 well-the dee-pest vertical well in Asia,GL3C well-the deepest horizontal well in Asia,Hongxing 1 well-the first eight spuds well in China,and Jiantan 1 well-the highest temperature well of CNPC in recent years.With the increasingly complex goals of oil and gas exploration and development,cementing in deep and ultra-deep wells is still facing new challenges.It is still necessary to continue to strengthen the research of cementing basic theory in deep and ultra-deep wells,key materials and working fluid for ultra-high temperature cementing,high-temperature and high-pressure cementing tools and supporting cementing processes in the hope of providing stronger technical support for deep and ultra-deep oil and gas exploration and development.
deep and ultra-deep wellshigh temperature and ultra-high temperaturecementing fluidcementing toolscementing processcementing technology
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