Pressure operated circulation valve
This patent describes a circulating valve for use in a tubing string in a wellbore traversing earth formations where the annulus between the tubing string and the well bore contains a liquid. It comprises a tubular mandrel assembly having an annular recess; a tubular sleeve assembly slidably mounted in the annular recess, the sleeve assembly including first and second sleeve member; a circulating port in the tubular mandrel assembly intermediate of the length of the annular recess; the sleeve members having overlapped portions and seal means cooperating with the sleeve member and the mandrel assembly for defining an annular chamber in fluid communication with the circular port in a first position on the mandrel assembly, the sleeve members being independently movable longitudinally of the mandrel assembly; first and second release means for respectively releasably connecting the first sleeve member and the second sleeve member to the tubular assembly and for releasably maintaining the annular chamber in fluid communication with the port in the first position; and one of the sleeve members being responsive to a pressure applied in the annular chamber for releasing one of the first and second releasable means so that the one sleeve member moves longitudinally to a second position for placing the interior of the tubular mandrel assembly in fluid communication through the port with the exterior about the sleeve member.
- Assignee:
- Lindsey Completion Systems, Inc., Midland, TX (United States)
- Patent Number(s):
- US 5048611; A
- Application Number:
- PPN: US 7-533028
- OSTI ID:
- 5572159
- Country of Publication:
- United States
- Language:
- English
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