Donald E Mcdowell

US Patent:

7878241, Feb 1, 2011

Filed:

Mar 5, 2008

Appl. No.:

12/042989

Inventors:

Jean Buytaert - Mineral Wells TX, US
Eugene Edward Miller - Weatherford TX, US
Donald Elwin McDowell - Millsap TX, US

Assignee:

Frank's International, Inc. - Houston TX

International Classification:

E21B 17/10

US Classification:

1662416, 1753255

Abstract:

A close-tolerance expandable bow spring centralizer having a first expandable collar A coupled to and spaced apart from a second expandable collar B through a plurality of bow springs wherein expandable collars A, B comprise a plurality of slidably coupled links that separate to expand the diameter of the collars A, B, e. g. , upon expansion of an expandable pipe string on which the centralizer is received. Expandable bow spring centralizer may grip the expandable pipe string when in the collapsed configuration to eliminate the need for a stop collar. Additionally or alternatively, a fin may be connected to each bow spring , and then connected to one or more adjacent fins upon collapse of the bow springs to form a restraining band that may be ruptured, e. g. , upon expansion of the expandable pipe string.

US Patent:

8196654, Jun 12, 2012

Filed:

Feb 1, 2011

Appl. No.:

13/019084

Inventors:

Jean Buytaert - Mineral Wells TX, US
Eugene Edward Miller - Weatherford TX, US
Donald Elwin McDowell - Millsap TX, US

Assignee:

Frank's International, Inc. - Houston TX

International Classification:

E21B 17/10

US Classification:

1662416, 1753255

Abstract:

A close-tolerance expandable bow spring centralizer having a first expandable collar A coupled to and spaced apart from a second expandable collar B through a plurality of bow springs wherein expandable collars A, B comprise a plurality of slidably coupled links that separate to expand the diameter of the collars A, B, e. g. , upon expansion of an expandable pipe string on which the centralizer is received. Expandable bow spring centralizer may grip the expandable pipe string when in the collapsed configuration to eliminate the need for a stop collar. Additionally or alternatively, a fin may be connected to each bow spring , and then connected to one or more adjacent fins upon collapse of the bow springs to form a restraining band that may be ruptured, e. g. , upon expansion of the expandable pipe string.

US Patent:

20120227959, Sep 13, 2012

Filed:

May 21, 2012

Appl. No.:

13/476807

Inventors:

Jean Buytaert - Mineral Wells TX, US
Eugene Edward Miller - Weatherford TX, US
Donald Elwin McDowell - Millsap TX, US

Assignee:

FRANK'S INTERNATIONAL, INC. - Houston TX

International Classification:

E21B 17/10

US Classification:

1662416

Abstract:

A close-tolerance expandable bow spring centralizer having a first expandable collar A coupled to and spaced apart from a second expandable collar B through a plurality of bow springs wherein expandable collars A, B comprise a plurality of slidably coupled links that separate to expand the diameter of the collars A, B, e.g., upon expansion of an expandable pipe string on which the centralizer is received. Expandable bow spring centralizer may grip the expandable pipe string when in the collapsed configuration to eliminate the need for a stop collar. Additionally or alternatively, a fin may be connected to each bow spring , and then connected to one or more adjacent fins upon collapse of the bow springs to form a restraining band that may be ruptured, e.g., upon expansion of the expandable pipe string