Applying corrosion inhibitor within tubulars
AssigneeSaudi Arabian Oil Company
InventorQais Mohammad Al Hennawi
Life of this patent
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Abstract
A central tubular defines a central flow passage and spray nozzles along an outer circumference of the central tubular. A first brush pig supports a first end of the central tubular. A second brush pig supports a second end of the tubular. An inflatable balloon is at the second end of the tubular. The inflatable balloon is encircled by the second brush pig. The inflatable balloon is configured to cause a first pressure drop across the balloon when in an inflated state and cause a second pressure drop, less than the first pressure drop, across the balloon when in a deflated state. A flow control system is at the first end of the tubular and is configured to regulate fluid exchange with the tubular and fluid exchange with the inflatable balloon.
Claims12
A method comprising:
- receiving a tool by a tubular, the tool comprising:
- a central tubular defining a central flow passage and spray nozzles fluidically connecting the flow passage to an outside environment;
- a first brush pig supporting a first end of the central tubular;
- a second brush pig supporting a second end of the central tubular;
- an inflatable balloon at the second end of the central tubular, the inflatable balloon encircled by the second brush pig;
- and
- a flow control system at the first end of the central tubular, the flow control system configured to regulate fluid exchange with the central tubular and fluid exchange with the inflatable balloon, the flow control system configured to receive a chemical injection line;
- and
- applying, by the tool, corrosion inhibitor to an inner surface of the tubular received by the tool.
Dependencies are inferred from the claim text.