Method and apparatus for washing an upper completion
AssigneeConocoPhillips Company
InventorRune Woie
Life of this patent
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Abstract
The invention relates to the cleaning of a wellbore including a reservoir liner 3 and an upper portion 2 of the wellbore, by running in only one string into the wellbore and performing a reservoir liner cementing operation, displacing the cement 7 with completion fluid 8, followed using the same string to circulate mud in the upper completion, perform an inflow test on the reservoir liner 3, wash the upper completion and displace it to completion fluid 8.
Claims3
An apparatus for washing a cased wellbore, wherein the cased wellbore includes an upper, cased part, and wherein the apparatus comprises a drill string and a reservoir liner, and wherein the drill string comprises:
- a) a drill pipe, and
- b) an assembly fitted to a distal end of the drill pipe, the assembly comprising:
- i) a reservoir liner hanger for anchoring the reservoir liner to the upper, cased part;
- ii) a reservoir liner hanger running tool;
- iii) an inflow test tool capable of forming a sealed connection between the drill string and a polished bore receptacle that is part of the reservoir liner hanger, for performing an inflow test on the reservoir liner;
- and
- iv) a ball valve that is closable, wherein said ball valve allows flow when open and said ball valve acts as a barrier when closed, said ball valve preventing debris from the upper part of the well from falling into the reservoir liner and preventing leakage of fluid coming to surface from the reservoir liner during an inflow test;
- wherein the reservoir liner is cemented in the wellbore.
Dependencies are inferred from the claim text.