Method and apparatus for providing continuous foam circulation in wells
Patent
·
OSTI ID:5862344
A method and apparatus are described for maintaining continuous circulation of foam in a well through a segmented tubing string while the tubing string is being made up or broken up. A chamber having a foam entry port is formed around the tubing string above the wellhead. A valve is provided above the foam entry port to close off the upper portion of the chamber when the tubing string is broken and the upper portion raised above the valve. When it is desired to add or remove a tubing section from the tubing string, the tubing string is held by slips with its open end in the lower portion of the chamber. The upper tubing section is lifted in the chamber to above the valve. The valve is closed and foam is circulated in the chamber through the foam entry port to provide for continuous foam circulation, while another section of tubing is added or removed from the tubing string. (6 claims)
- Assignee:
- Chevron Research Co.
- Patent Number(s):
- US 3559739
- OSTI ID:
- 5862344
- Country of Publication:
- United States
- Language:
- English
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