| 摘要 |
<p>A method of drilling a wellbore comprises arranging a drill string and an expandable tubular in the wellbore such that a lower end portion of the wall of the tubular extends radially outward and in an axially reverse direction so as to form an expanded section extending around a remaining section of the tubular, drill string extending through the remaining section, and axially extending the expanded section by moving the remaining section downward relative to the expanded section so that the lower end portion of the wall bends radially outward and in an axially reverse direction, wherein the expanded section covers the wellbore wall in an upper portion of the wellbore. The drill string is operated so as to drill a lower wellbore portion, and a compound is transferred between the lower wellbore portion and a layer of the earth formation surrounding the lower wellbore portion.</p> |
