Method and apparatus for cementing and cleaning a reservoir liner
AssigneeConocoPhillips Company
InventorsHans Martin Leistad, Donald R. Girdler, Leif Arne Kvarme
Life of this patent
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Abstract
A procedure and apparatus for cementing and cleaning a reservoir liner 3 comprises installing a reservoir liner using a drill string 4 which extends only as far as the distal end of a cased part 2 of the well, then, using the drill string, displacing cement into the reservoir liner using completion fluid whereby, when the cement is in place in the annulus around the reservoir liner, the reservoir liner is already clean and filled with completion fluid. A ball valve 6 at the top of the reservoir liner 3 is then closed before the cased part 2 of the wellbore is cleaned, to avoid debris entering the reservoir liner.
Claims8
A process for cementing and cleaning a reservoir liner, the process comprising:
- a) installing said reservoir liner in a distal portion of a wellbore by running drillpipe into the wellbore, the drillpipe being fitted with an assembly on the distal end of the drillpipe, the assembly including a reservoir liner hanger and a surface-actuatable valve suitable for sealing the reservoir liner against material falling from the wellbore above the valve;
- b) passing cement through the drillpipe and into the reservoir liner, directly followed by completion fluid;
- c) thereby causing cement to pass back up an annulus between the reservoir liner and rock;
- d) actuating the valve, thereby separating the wellbore above the valve from the wellbore below the valve;
- wherein, after sealing the reservoir liner, the wellbore above the valve is displaced to completion fluid and the valve then opened such that the entire wellbore is in a condition for completion.
Dependencies are inferred from the claim text.