Borehole casing centralizer

Details Borehole casing centralizer Borehole casing centralizer

2001-05-07

2003-10-28

Bagnell, David (Department: 3679)

Wells

Guide for device or conduit

Surrounding existing device or tubing

C166S241100, C166S241600, C166S213000

Reexamination Certificate

active

06637511

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a centralizer segment and a centralizer formed of one or more centralizer segments.
The centralizer may be used to centralise a borehole casing. Such borehole casings may be used, for example, in water wells, oil wells and gas wells.
DISCLOSURE OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a centralizer segment
200
comprising a first collar portion
202
, a second collar portion
204
, bow means
206
extending between said first collar portion
202
and said second collar portion
204
, first connection means
208
provided at first locations of said first collar portion
202
and said second collar portion
204
, respectively, second connection means
210
provided at second locations of said first collar portion
202
and said second collar portion
204
, respectively, wherein said first connection means
208
are engagable with said second connection means
210
of the same or another centralizer segment
200
such that one or more said centralizer segments
200
are connectable together to form a centralizer around a borehole casing.
Preferably, said first and second connection means
210
allow the relative positional engagement between said first and second connection means
208
,
210
to be selected.
Preferably, said first connection means
208
comprises teeth provided on said first and second collar portions
202
,
204
on a first face of said centralizer segment
200
and said second connection means
210
comprises pawl means provided on said first and second collar portions
202
,
204
on a second face of said centralizer segment
200
.
Preferably said second connection means
210
further comprises guide means for receiving first and second collar portions
202
,
204
of a said centralizer segment
200
.
Preferably, said first and second collar portions
202
,
204
are provided with lug members on a face of said centralizer segment
200
that, in use, faces away from the borehole casing.
The lug members can be used to tighten the centralizer segment
200
around the borehole casing.
Preferably, said bow means
206
is flexibly resilient.
Preferably, said bow means
206
is curved in the direction between said first and second collar portions
202
,
204
.
Preferably, said bow means
206
extends between said first and second collar portions
202
,
204
intermediate the locations of said first and second connection means
208
,
210
.
Preferably, agitation promoting means is provided on said centralizer segment
200
to promote agitation of grout injected into a borehole.
Preferably, said agitation promoting means comprise rib members provided on said bow means
206
.
Preferably, said rib members are provided on a face of said centralizer segment
200
that, in use, faces the borehole casing.
Preferably, at least one of said rib members is provided with at least one enlarged portion.
Preferably, said bow means
206
comprises at least two strap members extending between said first and second collar portions
202
,
204
.
Preferably, said first and second collar portions
202
,
204
are substantially parallel.
Preferably, said first and second collar portions
202
,
204
are provided as strap members.
Preferably, said centralizer segment
200
is made of a corrosion resistant material.
In accordance with a second aspect of the present invention, there is provided a centralizer for a borehole casing comprising a centralizer segment
200
, as hereinbefore described, connected together via said first and second connection means
208
,
210
around a borehole casing.
The centralizer may comprise at least two centralizer segments
200
connected together via said first and second connection means
208
,
210
around a borehole casing.
In accordance with a third aspect of the present invention, there is provided a centralizer for a borehole casing comprising at least two centralizer segments,
200
as hereinbefore described, connected together via said first and second connection means
208
,
210
around a borehole casing.


REFERENCES:
patent: 3749168 (1973-07-01), Hall, Sr.
patent: 4269269 (1981-05-01), Wilson
patent: 4520869 (1985-06-01), Svenson
patent: 4909322 (1990-03-01), Patterson et al.
patent: 6367556 (2002-04-01), Moore
Weatherford Cementing Products Catalog, 1995, 11 pages.
Excerpts from Weatherford Products & Services Catalog, 3 pages. (Undated).
RACI, Spacers for Pipeline Cased Crossings, 9 pages. (Undated).

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