LINER DRILLING AND CEMENTING SYSTEM UTILIZING A CONCENTRIC INNER STRING

摘要

A method of drilling a well and installing a liner includes assemblingconcentricinner and outer strings of tubulars, A drill bit is located at the lower endof the innerstring and a liner with a liner hanger makes up part of the outer string. Theinner and outerstrings may be rotated in unison to drill the well. At a selected depth, theoperator sets the linerhanger and retrieves the inner string. The operator lowers a packer and acement retainer ona string of conduit. The packer engages the liner hanger and the cementretainer is conveyedto the lower end of the liner. The cement retainer prevents cement in theouter annulus fromflowing back up the string of conduit. The operator manipulates the conduit toset the packer.