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Патент USA US3062307

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Nov. 6, 1962
R. TYRRELL, JR
3,062,297
WELL-CASING CENTRALIZERS
Filed Nov. 25. 1960
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FIG. I
5
8
l5
ROBERT
FIG. 4
INVENTOR.
TYRRELL, JR.
BY
i
ATTORNEY
3,062,297
United States Patent 0 ” 1C6
Patented Nov. 6, 1962
2
l
stantial stresses and strains encountered under conditions
_
3,062,297
to actual use.
WELL-CASING EENTRALIZERS
>
With the above and other objects in view, my invention
Robert Tyrrell, Jr., 2124 Carey Place,
resides in the novel features of form, construction, ar
rangement, and combination of parts presently described
and pointed out in the claims.
Oklahoma City, Okla.
Filed Nov. 25, 1§50, Ser. No. 71,737
9 Claims. (Cl. 166-—241)
In the accompanying drawing (one sheet)——
This invention relates in general to certain new and
FIG. 1 is a fragmentary sectional view of a well-bore
useful improvements in oil well drilling devices and,
and casing equipped with a well-casing centralizer con
more particularly, to well-casing centralizers.
10 structed in accordance with and embodying the present
In the drilling of oil Wells, it is conventional practice to
invention;
drill the well~bore or so—called “hole” into the ground by
FIG. 2 is an elevational view of a well-casing cen
means of a rotary drill. The well-bore will be drilled to
tralizer constructed in accordance with and embodying
some selected diametral size and a casing of somewhat
smaller diametral size will be set into the well-bore in
the present invention;
FIG. 3 is a transverse sectional view taken along line
3—~3 of FIG. 2;
FIG. 4 is a fragmentary sectional view taken along
line 4~4 of FIG. 3;
such a manner that there is an annular space between the
side walls of the well-bore and the outer surfaces of the
casing. While the well is being drilled, the space between
the drill and wall of the well-bore is used for the upward
FIG. 5 is a fragmentary elevational view of a modi?ed
circulation and removal of well drilling mud which is 20 form of well~casing centralizer constructed in accordance
pumped down into the well through the internal bore of
with and embodying the present invention; and
the. rotary drill and serves the dual purpose of facilitating
FIG. 6 is a transverse sectional view taken along line
the cutting action of the drill-bit and removing the dis
6—6 of FIG. 5.
integratingrock,shale, and earth ‘which is cut away by
Referring now in more detail and by reference char
the bit. ' When the drilling action'has been completed, the 25 acters to the drawing, which illustrates practical embodi
casing is thereupon‘ inserted and cemented permanently
ments of the present invention, A designates a well-bore
in the well-bore by pumping fluid cement down through
drilled into the ground in any conventional manner and
the casing and forcing it upwardly into the annular space
provided with a “string” of casing B. It will, of course,
between the outer surfaces of the casing and the side
be understood that the well-bore A and string of casing
walls of the well-bore.
30 B may be of any suitable length or diametral size and,
The drilling mud which is circulated through the well~
moreover, that the string of casing will consist of a plu
bore during the drilling operation ordinarily leaves a
coating of deposited solids which will interfere with the
cementing operation. Therefore, the casing is usually
equipped at suitably spaced sections throughout its length
with radially projecting devices referred to as “scratchers.”
These scratchers will extend outwardly across the annular
space between the outer surfaces of the casing and the
rality of joints which are threadedly interconnected.
Provided for disposition around the otuside surface of
the casing B is a well-casing centralizer C including a
35
pair of axially spaced cylindrical collars or bands 1, 2,
having an internal diametral size adapted for loose-?tting
or annularly spaced disposition around the casing B.
side walls of the well-bore and will scratch away the ac
Welded or otherwise rigidly secured at their upper ends
to the upper collar 1 are four equally spaced axially ex
cumulated deposits left by the drilling mud when the
tending ?at bars 3 formed of spring steel stock and being
casing is rotated in place. It is, of course, also necessary
that the casing be located as nearly as possible in con
centric position within the well-bore. In other words,
curved or bowed outwardly for resilient contact along
their central portions with side walls of the well-bore A.
At the lower ends, the bars 3 are welded to the lower
the longitudinal axis of the casing ‘should be substantially
collar or band 2, thereby holding the collar or bands 1, 2,
coincident with the longitudinal axis of the well-bore and, 45 in axially spaced relation, as best seen in FIG. 2.
when the casing is in this proper location, it is referred
to as being “centralized.” In order to achieve this cen
tralized position, the well-casing is equipped with externally projecting, somewhat resilient devices or so-called
“centralizers” which contact the side walls of the well
It should be noted in this connection that the well
casing centralizer C is shown and herein described as hav
ing four resilient bars 3, but it should be understood that
a different number of bars may be employed so long as
50 the bars are symmetrically placed in relation to each
bore and hold the casing in centralized position therein.
other.
Devices of this type which are presently in use, however,
tend to bind both against the casing and the well-bore,
each pair of adjacent bars 3, with a rectangular aperture
The upper collar or band 1 is provided, intermediate
thereby setting up frictional forces which impede and
4 bordered across its top and bottom transverse margins
often prevent rotation of the casing when it is desired to
bring the scratchers into operation for cleaning away the
with upstruck strap portions 5, 6, in the provision of
deposit left by the drilling mud.
It is, therefore, the primary object of the present inven
retainer sockets for engagement with the upper and lower
ends, respectively, of a pin-like vertical shaft 7. Rotat
ably mounted upon each of the pin-like shafts 7 is a
roller bearing 8 held in place between pairs of set collars
tion to provide a well-casing centralizer which is capable
of centralizing the well-casing within the well-bore while 60 9, 10, the latter being secured to the pin-like shaft 7 by
_at the same time affording freedom for rotation of the
means of set screws 11, 12, respectively. The roller hear
ing 8 is turned down at its outer ends in the provision of
It is another object of the present invention to provide
annular arcuate shoulders 13, 14, and a ?at diametrally
a well-casing centralizer of the type stated which can be
enlarged central or crowned bearing surface 15, the latter
65
easily and conveniently installed upon the casing and will
being of such diametral size as to extend throughthe aper
be held ?rmly thereon against unauthorized axial shifting
ture 4 and bear roller-wise against the outer surface 0
movement with respect to the casing.
the casing B, as best seen in FIG. 3.
'
It is a further object of the present invention to provide
The well-casing centralizer C is held in place against
a well-casing centralizer of the type stated which is simple
axial shifting movement against the casing by means of
and economical in construction, but is nevertheless, 70
casing preparatory to cementing operations.
cylindrical clamping collars 16, 17, which- are rigidly
rugged, durable, and capable in withstanding the sub
affixed to the casing B by‘ means of- a' plurality of set
3,062,297
3
ing roller bearing elements mounted on said shaft and pro
screws 18, 19, respectively. As shown in FIG. 1, the
jecting inwardly for engagement with the casing whereby
collar 16 is disposed in endwise abutment against the
to support the centralizer in annularly spaced rotatable
upper margin of the band 1 and the collar 17 is disposed
relation around the casing.
in endwise abutment against the lower margin of the
4. A well casing centralizer comprising two axially
band 2. The tightness of abutment between the collars
spaced collars connected by a plurality of symmetrically
16, 17, and the bands 1, 2, is just su?icient to hold the
positioned axially extending resilient bands, said collars
well-casing centralizer C in position on the casing B, but
being provided with upstruck strap portions and rectangu
will not bind the well-casing centralizer C or prevent rela
lar apertures at each of their transverse margins, an
tive rotation between the centralizer C and the casing B
as facilitated by the rollers 8.
10 axially extending shaft mounted in each of said apertures,
bearing elements mounted on said shaft and projecting
The well-casing centralizer C is installed upon each
inwardly for engagement with the casing whereby to sup
joint of casing B before it is connected in the string simply
port the centralizer in annularly spaced rotatable relation
by slipping the band 2 over the free end of the joint of
around the casing.
easing B and sliding it along to a desired position. At the
5. A well casing centralizer comprising two axially
same time, a clamping collar 16 is slipped over the end 15
spaced collars connected by a plurality of symmetrically
of the joint of easing B and pushed along with the well
positioned axially extending bands, said collars being pro
casing centralizer C in the relative position shown in
vided with upstruck strap portions and rectangular aper
PEG. 1. When the clamping collar 16 and the well
tures at each of their transverse margins in the provision
casing centralizer C are located in the desired position
of retainer sockets, an axially extending shaft mounted in
along the casing B, the set screws 17, 18, are tightened
each of said sockets, centrally crowned roller bearing ele
down, thereby locking the clamping collar 16 in place.
ments mounted on said shaft and projecting inwardly for
Thereupon, such particular joint of casing B can be spun
engagement with the casing whereby to support the cen
into the next adjacent joint of casing and lowered into
tralizer in annularly spaced rotatable relation around the
the well-bore A.
If desired, it is possible to provide a modi?ed form of 25 casing, said bearing elements having a crowned bearing
surface that is diametrally reduced at each end in the pro
well-casing centralizer C’ which is substantially identical
vision of annular arcuate shoulders.
in all respects with the previously described well-casing
centralizer C, except that, instead of collars or bands, such
as the previously described collars or bands 1, 2, it is pro
vided with a form of split collar 1' composed of two
semi-circular sections 20, 21, which ?t together in edge
wise relation to form a cylindrical casing-encircling ele
ment. The sections 20, 21, are respectively provided with
axially aligned internesting sets of hinge eyes 22, 23, 24,
which extend across the lines of axial abutment between
the sections 20, 21, and receive drive pins 25. The well
casing centralizer C’ can be applied to the casing B’ by
removal of the drive pins 25, so that the two separated
halves thereof can be ?tted together around the well-cas
6. A well casing centralizer comprising two axially
spaced collars connected by a plurality of symmetrically
positioned axially extending bands, said collars being pro
vided with upstruck strap portions and rectangular aper
tures at each of their transverse margins in the provision
of retainer sockets, an axially extending shaft mounted in
each of said sockets, bearing elements mounted on said
shaft and projecting inwardly for engagement with the
casing whereby to support the centralizer in annularly
spaced rotatable relation around the casing, said bearing
elements having a crowned bearing surface that is dia
metrally reduced at each end in the provision of annular
ing, whereupon the drive pins 25 may be inserted to hold :10 arcuate shoulders, said collars being axially split and pro
vided with internested aligned eye-forming elements re
the sections in encircling relationship around the casing B’.
leasably secured together by pins.
It should be understood that changes and modi?cations
7. A well casing centralizer comprising two axially
in the form, construction, arrangement, and combination
spaced collars connected by a plurality of symmetrically
of the several parts of the oil well drilling devices may be
made and substituted for those herein shown and described 45 positioned axially extending bands, said collars being pro
vided with upstruck strap portions and rectangular aper
without departing from the nature and principle of my
tures at each of their transverse margins in the provision of
invention.
retainer sockets, an axially extending shaft mounted in
Having thus described my invention, what I claim and
each of said sockets, bearing elements mounted on said
desire to secure by Letters Patent is—
shaft and projecting inwardly for engagement with the
casing whereby to support the centralizer in annularly
spaced rotatable relation around the casing, said bearing
elements having a crowned bearing surface that is di
ametrally reduced at each end in the provision of annular
tures at each of their transverse margins, an axially ex
tending shaft mounted in each of said apertures, bearing 55 arcuate shoulders, said collars being axially split and
provided with internested aligned eye-forming elements
elements mounted on said shaft and projecting inwardly
releasably secured together by tapered pins.
for engagement with the casing whereby to support the
8. A well casing centralizer comprising two axially
centralizer in annularly spaced rotatable relation around
spaced collars connected by a plurality of symmetrically
the casing.
2. A well casing centralizer comprising two axially 60 positioned axially extending resilient bands, said collars
being provided with upstruck strap portions and rectangu
spaced collars connected by a plurality of symmetrically
lar apertures at each of their transverse margins in the
positioned axially extending bands, said collars being pro
vided with upstruck strap portions and rectangular aper
provision of retainer sockets, an axially extending shaft
tures at each of their transverse margins, an axially ex
mounted in each of said sockets, roller bearing elements
tending shaft mounted in each of said apertures, roller
mounted on said shaft and projecting inwardly for engage
bearing elements mounted on said shaft and projecting
ment with the casing whereby to support the centralizer in
inwardly for engagement with the casing whereby to sup
annularly spaced rotatable relation around the casing, said
port the centralizer in annularly spaced rotatable relation
bearing elements having a crowned bearing surface that
around the casing.
is diametrally reduced at each end in the provision of
3. A well casing centralizer comprising two axially
annular arcuate shoulders.
spaced collars connected by a plurality of symmetrically
9. A well casing centralizer comprising two axially
positioned axially extending bands, said collars being pro
1. A well casing centralizer comprising two axially
spaced collars connected by a plurality of symmetrically
positioned axially extending bands, said collars being pro
vided with upstruck strap portions and rectangular aper
spaced collars connected by a plurality of symmetrically
positioned axially extending resilient bands, said collars
ing shaft mounted in each of said apertures, axially extend 75 being provided with upstruck strap portions and rectangu
vided with upstruck strap portions and rectangular aper
tures at each of their transverse margins, an axially extend
5
3,062,297
lat apertures at each of their transverse margins in the
provision of retainer sockets, an axially extending shaft
mounted in each of said sockets, axially extending roller
bearing elements mounted on said shaft and projecting
inwardly for engagement with the casing whereby to sup 5
port the centralizer in annularly spaced rotatable relation
around the casing, said bearing elements having a crowned
bearing surface that is diametrally reduced at each end
in the provision of annular arcuate shoulders.
6
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,566,451
1,890,529
2,197,531
2,290,429
2,781,100
2,986,417
Vaughn ______________ __ Dec. 22, 1925
Santiago _____________ __ Dec. 13, 1932
Smith _______________ __ Apr. 16, 1940
Hartman et al __________ __ July 21, 1942
Pyle et a1 _____________ __ Feb. 12, 1957
Baker _______________ __ May 30, 1961
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