Variable diameter pipe expander

Details Variable diameter pipe expander Variable diameter pipe expander

2011-07-19

2011-07-19

Jones, David B (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

Spherical tool

C072S393000, C072S462000, C166S380000

Reexamination Certificate

active

07980107

ABSTRACT:
A reducing pipe expander that applies to casing deformation restoration of deep wells such as oil field and comprises a conical-nosed enclosure, a mandrel and several steel balls. The main body of the enclosure is equipped with several radial slotted holes to nest steel balls. Held by a taper, slant or curved face against insides of the slotted holes, the steel balls move axially, overhanging the enclosure. When the deformed casing pipe or patching pipe obstructs the pipe expander from moving forward, the steel balls will move in the reverse direction of the movement of the expander to directly expand the deformed pipe. When the expander can pass through the casing pipe or patching pipe, the steel balls will be free to return to their original status.

REFERENCES:
patent: 1930825 (1933-10-01), Raymond
patent: 3201827 (1965-08-01), Reynolds et al.
patent: 3640115 (1972-02-01), Duncan et al.
patent: 3818734 (1974-06-01), Bateman
patent: 3934443 (1976-01-01), Keen
patent: 4512178 (1985-04-01), Blevins et al.
patent: 6457532 (2002-10-01), Simpson
patent: 6702030 (2004-03-01), Simpson

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