thus allowing the production tubing string 12 to be interrupted by the installation of a tailpipe 26 at the downhole end of the tailpipe 26 the remaining portion of the tubing string 12 i e the second portion of the tubing string picks back up and continues through the wellbore fig1 depicts a second packer assembly 36 which is again utilized to ensure fluids do not flow down the liner to lower portions of the wellbore likewise the second packer assembly 36 is inserted in its collapsed form into the annulus 35 between the tubing string 12 and the liner 10 at the downhole end of the tailpipe 26 a nipple 38 can be utilized at the end of the second section of the tubing string below the tailpipe as previously mentioned it is sometimes desirable to drill a sidetrack well from within a wellbore for clarity it should be understood that conventional wells are drilled substantially vertically from the surface downward to or through the producing formation however wellbores may be drilled at a slanted or inclined orientation from the vertical axis likewise deviation may produce a horizontal orientation sidetrack wells may extend in any direction from the original well and in the case of a horizontal wellbore may extend upward or downward the tailpipe 26 assists in formation of a sidetrack wellbore 34 upon being inserted into the wellbore below the first section of the tubing string 12 and above the second section of the tubing string 12 the tailpipe 26 is positioned as close to center as practical within the liner 10 in.