Restriction subs for setting cement plugs in wells
- 申请公布号：
- US4907649(A)
- 申请号：
- US19880266266
- 申请日期：
- 1988.10.26
- 申请公布日期：
- 1990.03.13
- 申请人：
- BODE, ROBERT E.
- 发明人：
- BODE, ROBERT E.
- 分类号：
- E21B33/16;E21B47/09
- 主分类号：
- E21B33/16
- 摘要：
- In accordance with illustrative embodiments of the present invention, restriction subs for use in setting cement plugs in wells include a tubular threaded adapter having an internal annular recess, and a metal restriction sleeve mount in such recess. In one embodiment, the sleeve has a corrugation that extends into the bore of the adapter to provide a deformable restriction; in another embodiment the sleeve has curved resilient tabs whose free ends extend into such bore. The restrictions are cooperable with a displacement plug having a metal expander member on its nose so that a distinct pressure is required to cause the expander member and plug to be forced through the restriction.
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