Using Casing to Drill Directional Wells

摘要

The use of casing for drilling is an emerging technology that can reduce well-construction costs,improve operational efficiency and safety,and minimize environmental impact.Fundamentally simple in principle,this drilling technique uses the large-diameter tubulars that will be permanently installed in a wellbore in place of conventional drillpipe.The economic demands of complex geologic settings,smaller reservoirs with limited recoverable reserves,and the need to optimize development and exploitation of mature fields make drilling operations with casing increasingly attractive to operating companies.