Downhole artificial lifting system
AssigneeWelltec A/S
InventorsJørgen Hallundbæk, Paul Hazel
Life of this patent
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Abstract
The present invention relates to a downhole artificial lifting system for introducing fluid into a production casing from an annulus arranged outside the production casing. The production casing has an axial extension and a casing wall with a wall thickness, and the system comprises the production casing which at a first part is surrounded by an intermediate casing creating the annulus which is downwardly closed, and a fluid delivering means pumping fluid into the annulus. The invention also relates to a tool for use in the system and a method.
Claims16
A downhole artificial lifting system for introducing fluid into a production casing from an annulus arranged outside the production casing, the production casing having an axial extension and a casing wall with a wall thickness (t), the system comprising:
- the production casing which at a first part is surrounded by an intermediate casing, creating the annulus which is downwardly closed, and
- a fluid delivering means pumping fluid into the annulus,
- wherein the system further comprises at least one inflow control valve having an axial direction, arranged in the first part of the casing wall so that the axial direction of the valve is substantially perpendicular to the axial extension of the casing.
A method for fitting a downhole inflow control valve into an existing production casing downhole, the casing having a casing wall, the method comprising the steps of:
- introducing a tool into the casing and lowering the tool to a predetermined position,
- providing an opening in the casing wall,
- inserting the downhole inflow control valve into the opening, and
- fastening the downhole inflow control valve to the casing wall.
A method for replacing a downhole inflow control valve in a production casing downhole, the casing having a casing wall, the method comprising the steps of:
- introducing a tool into the casing and lowering the tool to the valve to be replaced,
- unfastening the valve from the casing wall,
- retrieving the valve from the casing and thereby exposing an opening in the casing wall,
- inserting a new valve into the opening, and
- fastening the new valve to the casing wall.
A method for providing an artificial lift in a well downhole using at least one inflow control valve in a production casing downhole, the production casing being enclosed by an intermediate casing, creating an annulus, the method comprising the steps of:
- connecting a fluid delivering means with the annulus,
- pumping fluid into the annulus by means of the fluid delivering device,
- wherein the fluid has a density lower than that of crude oil or is gas, and
- opening the inflow control valve being connected to the annulus, allowing the fluid to enter through the inflow control valve into the production casing, whereby the fluid in the production casing starts to flow, or flows faster.
Dependencies are inferred from the claim text.