Method and apparatus for gravel packing well bores
A liner provided with bypass ports and a perforated portion or screen below the ports is secured to a suitable well packer and lowered on an outer tubing string in well casing to a location at the screen straddles casing perforations within a producing formation. The packer is packed-off against the casing above its perforations and anchored against movement in both directions to secure the liner and its screen in place. An inner tubing string is lowered through the outer string into the liner. The inner string and liner have upper and lower seal devices, either of which is selectively engaged while the other is disengaged, or both of which are disengaged, by longitudinal movement of the inner string in the outer string and liner, to control the flow of circulating, washing, or acidizing fluids in both directions between the inner string, linner-casing annulus, and inner string- outer string annulus, and also the placement of gravel in the liner-casing annulus. (19 claims)
- Assignee:
- Baker Oil Tools Inc
- Patent Number(s):
- US 3963076
- OSTI ID:
- 6736989
- Country of Publication:
- United States
- Language:
- English
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