Method of creating a borehole in an earth formation
AssigneeShell Oil Company
InventorsScott Anthony Benzie, John Alexander Gordon Dewar, Andrei Gregory Filippov, Paul Dirk Schilte
Life of this patent
Estimating the term…
Abstract
A method of creating a borehole in an earth formation is provided. The method involves the steps of drilling a section of the borehole and lowering an expandable tubular element into the borehole whereby a lower portion of the tubular element extends into the drilled borehole section, radially expanding the lower portion of the tubular element so as to form a casing in the drilled borehole section, and separating an upper portion of the tubular element from the lower portion so as to allow the separated upper portion to be moved relative to the lower portion.
Claims26
A method of creating a borehole in an earth formation, the method comprising the steps of:
- a) drilling a section of the borehole and lowering an expandable tubular element into the borehole whereby a lower portion of the tubular element extends into the drilled borehole section;
- b) radially expanding said lower portion of the tubular element so as to form a casing in the drilled borehole section;
- c) separating an upper portion of the tubular element from said lower portion so as to allow the separated upper portion to be moved relative to said lower portion;
- and
- d) lowering said separated upper portion through the expanded lower portion formed in preceding step (b).
Dependencies are inferred from the claim text.