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Патент USA US3065015

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Nov. 20, 1962
J. E. HALL, 5R., ErAL
3,065,005
CASING STOP COLLAR To MOUNT A WELL TOOL
Filed July 27, 1959
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INVENToRs.
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doh/7 A. «Va/f
Nov. 20, 1962
J. E. HALL, sR.. ETAL
3,065,005
cAsING sToP COLLAR To MOUNT A WELL rrooL
Filed July 27, 1959
3 Sheets-Sheet 2
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INVENTUM.
desse E. /fw/ 5ft
Nov. 20, 1962
J. E. HALL., sR., ETAL
3,055,005
CASING sToP COLLAR To MOUNT A WELL TooL
Filed July 27, 1959
5 Sheets-Sheet 3
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United States Patent
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Patented Nov. 20, 196.2
1
2
with parts cut away and in section to show the position
` Sdi-655105
CASING STO? CULLAR T0 MGUN'I‘ A WELL T1101.
Jesse E. Hall, Sr., 1011 W, Spring St., and .lohn A. Haii,
815 S. Jefferson, both of Weatherford, Tex.
Filed .Iuly 27, 1959, Ser. l To. 329,623
6 Claims. (Ci. Na7-£2)
This invention relates to improvements in tool mount
ings and refers more particularly to pipe gripping devices
and stop collar constructions used on the exterior of pipe
or casing to locate and mount well tools thereone.
This application is a continuation-in-part of our ap
plication Serial No. 438,504, tiled June 22, 1954, “Casing
Stop Collar To Mount a Well Tool,” issued August 4,
1959, as Patent No. 2,898,136.
In the mounting of well tools, and particularly scratch
ers, cement baskets and centralizers, it is important to
locate the tools at a predetermined position on the cas
ing or pipe. Since the tools must operate within a desig
nated and limited area of the well bore in order to
accomplish the results for which they were intended, they
of the wedge and pusher rings before insertion of the
spreader screw. FIGS. 1 and 2 show the assembly before
screwing in of the spreader screw.
FIG. 3 is a view corresponding to FIG. 2 after setting
of the spreader screw and with the other side of the cas
ing and collar in section to illustrate the position of the
parts without a spreader screw in the immediate vicinity.
FiG. 4 is a perspective View of the construction of
FIGS. l-3_before insertion of the wedge and pusher
rings illustrating the manner of insertion of the latter.
FIG. 5 is a detail of one of the pusher rings shown in
FIG. 4.
FIG. 6 is a detail of one of the coil-wrapped wedge
rings shown in FIG. 4.
FIG. 7 is a View of a stop collar as .in the previous
figures wherein a pair of nails extending in the same di
rection are utilized as spreading means for Wedge rings,
parts cut away and in section to better illustrate the
construction.
4
FIG. 8 is a view of a construction similar to FIG. 7,
with the exception that only a single nail is employed to
must be located properly on the pipe. If it is desired to
spread the wedge rings at a given point, nails being driven
fixedly attach the tools of the pipe, it has been the usual
practice to fasten the tools by welding directly to the
into the collar in opposite directions, parts cut away and
exterior surface of the pipe. If it is desired to permit 25 in section to better show the construction.
the tools to have a limited longitudinal movement and
free rotative movement, it is conventional to weld lugs or
stops above and below the tools and in some cases in
mounting centralizers to place a stop collar within the
-FIG. 9 is a view taken along the line 9_9 of FIG. 8
in the direction of the arrows.
FIG. l() is a plan sectional view of a stop collar as in
the previous figures wherein only a single nail is inserted
device between collars. The mounting of tools by weld 30 between the wedge rings at a given point to force them
apart, with a plurality of nails employed and with the
ing is objectionable not only because of the expense of
original nails forced into the collar having sockets at
the labor involved and the necessity of having welding
the ends thereof to receive the heads of following nails.
equipment available, but also because it is time consum
FIG. ll is a side view of a stop collar as in the pre
ing and tends to weaken and deterioriate the pipe at
and adjacent to the welds. By the present invention, 35 vious figures wherein a single enlarged nail is employed
to both spread the wedge rings and jam the collar to one
there is provided a gripping device which may form an
side «to achieve contact of the wedge rings and collar
integral part of the tool itself or constitute a separate col
on the opposite side thereof.
lar or abutment for mounting the tool at the desired loca
FIG. l2 is a fragmental side sectional view showing a
tion on the pipe.
An object, therefore, of the present invention is to 40 collar as in the previous figures wherein a pair of nails
drive apart a pair of wedge rings which do not have coils
`provide a pipe gripping stop collar construction which is
wrapped therearound.
simple, rugged, inexpensive to manufacture and extremely
FIG. 13 is a fragmental side sectional view showing
easy to install by the operators on the job.
Another object of the invention is to provide a con
struction for use as a stop collar which is extremely
a collar as in the previous iigures wherein a single nail
deñects a single wedge ring, the nail itself operating to
wedge the other direction of motion of the collar.
strong and designed to withstand over long periods of
While the stop collar in the drawings has not been
time the abuse to which it is subjected in deep well oper
shown in application with any particular tool, such as
ations without slipping, destruction or failure.
a scratcher or centralizer, it is contemplated that it may
Another object of the invention is to provide a pipe
gripping stop collar construction which has great versa 50 be used as an integral part of a cement basket, a scratch
er, or a centralizer or as a separate stop collar mounting
-tility in ways of mounting and attaching to the pipe.
with any of the different types of tools which are conven
Another object of the invention is to provide a pipe
tionally mounted on the exterior of pipe or casing in well
gripping stop collar construction which entirely eliminates
work.
the necessity of welding operations and insures a satis
Referring to the structure shown in FI'GS. l~6, inclu
factory operational mounting of the collar on the pipe
sive, there is shown in these figures a stop collar used as
by the use of one or more wedge rings of wire or coil
an abutment for well tools mounted on a casing or pipe
form which are squeezed and jammed between the tap
At 10 is indicated the pipe or casing. 11 designates gen
ered interior surfaces of a collar and the cylindrical
erally a collar arched internally to form a passageway
outer surface of the pipe.
Other and further objects of the invention will appear 60 11a extending circumferentially of the collar and having
inner wall surfaces tapered from the midsection of the
in the course of the following description.
collar toward the rims. The collar 11 is held iixedly in
In the accompanying drawings, which form a part of
any preselected location on the pipe by the insertion of
the instant specification and are to be read in conjunction
wedge
rings 12 and pusher Wires 14 into the passage
therewith, embodiments of the invention are shown and,
way 11a where the wedge rings are squeezed or wedged
in the various views, like numerals are employed to in 65
between the internal tapered surfaces of the collar and
dicate like parts.
the exterior surface of the pipe. The wedge ring assem
FIG. 1 is a plan view of a first form of the inventive
bly in operation is probably best shown in FIGS. 2 and
stop collar showing the pipe in section and with parts of
3. The wedge rings are designated as a whole (FIG. 6)
the collar broken away revealing the assembly after in 70 by the numeral 12 and consists of an open-ended circular
sertion ofthe Wedge and pusher rings.
core Wire 12a surrounded by a helically-wrapped coil of
FIG. 2 is a side View of the construction of FIG. l
smaller diameter wire 12b. Rings 12 are inserted into
aoeaooa
c:
...a
the arched passageway 11a within the collar through a
slotted aperture 13 shown in FIGS. 2 and 4. After
insertion of the wedge rings 12 into the collar, they are
separated and moved into preliminary wedging position
(FIG. 2) by the insertion of the pusher wires 14, shown
in FIG. 5 and FIG. 4.
The collar which serves as an abutment for the well
tools may be stamped from a hand of heavy sheet metal
or machined as shown in the figures from a heavy ring
of metal. To facilitate mounting the collar on the pipe,
it may be hinged (not shown).
To assemble the construction in FIGS. 1-6, reference
to FIG. 4 should be made.
In the case of each of the
wedge rings 12, one end is inserted in the opening 13
and the collar 11 rotated in the opposite direction as
shown by the arrows of FIG. 4. This action is applied
also in the case of the pusher rings, although these may
have to be inserted into the opening 13 by means of grip
pers or other devices as they will have, generally speak
ing, a greater tension on the collar in the position of
FIG. 4 so that they may tightly grip the casing 10 when
inserted into the collar 11.
To assure proper functioning of the wedge rings 12
within the collar, a spreader member or tapered set screw
15 may be screwed radially into internally threaded open
ing 16 into the collar as shown in FIGS. 2 and 3. The
of aperture 13', the nails being numbered 21 and 22. The
nails are driven circumferentially around the casing be
tween the wedge rings 12', in this instance the nails being
driven in opposite directions from one another.
Once
again, the nails do not necessarily have to have heads
21a and 22a, respectively, and may entirely pass into the
aperture 13’. The nails are preferably of suflicient ex
ternal diameter to cause a continuous wedging of the
rings 12’ at least substantially circumferentially of the
casing. The length of the nails is also preferably suffi
ciently great to provide considerable wedging contact with
the ringsy around the casing. Referring to FIG. 9, the ex
tension of the nails around the casing 10' may clearly be
seen. If nails 21 and 22 are headless, their heads may be
driven past the extremities of aperture 13’. This may be
accomplished by a pointed tool or another nail which is
later withdrawn from the aperture 13’.
FIG. 10 shows a wedging construction wherein a plu
rality of nails 23, 24 and 25 are serially driven into the
cavity 11a' between the wedge rings 12’. In this case,
nails ‘23 and 24 have sockets 23a and 24a in the heads
thereof to receive the tip of the following nail. The
final nail 25 is shown having a conventional head 25a
thereon.
In FIG. l1, there is shown the use of a single, very
large diameter nail 26, optionally having head 26a, which,
when driven between the wedge rings 12' on one side
of the collar, itself wedges in the passageway 11a’ so as
to operate to jam the collar against longitudinal move
and wedge rings outwardly to cause the latter to wedge
tightly between the tapered inner surfaces of the collar 30 ment on the casing 10’. On the other side of the casing,
the collar 11’ is pulled so tightly to the casing 10’ that
and the exterior of the pipe.
the wedge rings 12’ themselves wedge closely to the cen
Turning to FIG. 7, there are a number of identical
ter of the passageway 11a'. It should be noted, in this
structural features in this figure to that shown in FIGS.
tapered end of the screw 15 separates the loops of the
pusher or spreader wires, thus forcing the pusher wires
1-6.
Such parts are numbered the same as in FIGS 1-6,
case, as in the modification of FIG. 7, a relatively large
but primed. Thus casing 10’ mounts a collar 11’ which 35 gap 27 is provided on the nail side, while a relatively
small gap 28 is provided on the opposite side of the cas
is arched internally to form a passageway 11a' and has
ing between the casing and the collar rims.
an aperture or opening 13' substantially centrally thereof
FIG. 12 is identical in all ways with FIG. 7 except for
and centrally of the arched passageway. Wedge rings
the fact that solid wire wedge rings 12" are wedged by
identical in construction to those of FIGS. 1-6, inclusive
(having coil 12b’ and wire core 12a’), are received with 40 the two nails 17' and 18’. The solid wire wedge rings
may be substituted in all examples of this invention for
in the passageway, inserted through aperture 13’. Fig.
the coil-wound wedge rings shown in the other views.
7 differs from that construction shown before in that a
In FIG. 13, there is shown a relatively large diameter
pair of nails 17 and 18, optionally having heads 17a and
nail 29 (optionally having head 30) which is of suflicient
l17b, have been driven into the aperture 13’ and circum
ferentially of the casing between the wedge rings 12’ to 45 diameter to (l) sufliciently deiiect a single wedge ring 12’
to cause it to wedge in one direction and (2) wedge it
force them apart to wedge the collar on the casing. The
l'self to prevent motion in the other direction. Thus the
nails 17 and 1S do not need to have enlarged heads 17a
objects of the invention in this case are provided by the
and 17h, in which case, the heads of the nails may go
use of but a single peripheral wedge ring and a single
into the aperture 13’ and not protrude therebeyond as
shown. The manner of wedging in FIG. 7 is clear from 50 spreader member.
From the foregoing it will be seen that the invention is
comparing the two sectioned sides of the figure where the
one well adapted to attain all of the ends and objects
side `showing the nails wedging the rings 12 apart has
hereinabove set forth, together with all the other ad
the side of the collar further spaced from the casing pro
vantages which are obvious and which are inherent to the
viding a gap 19 of relatively great size, while the opposite
side where the nails do not extend has a relatively minute 55 structure.
It will be understood that certain features and subcombi
gap 20 with the wedge rings 12’ wedging closely adjacent
nations are of utility and may be employed without refer
the center of the passageway. The diameter of the nails
17 and 18 must be suñicient to cause wedging of the rings
ence to other features and subcombinations. This is con
templated by and is within the scope of the claims.
As many possible embodiments may be made of the
The use of nails in the manner of FIG. 7 and the fol 60
invention without departing from the scope thereof, it is
lowing figures permits a high-speed wedging apart of the
to be understood that all materials hereinabove set forth or
rings 12', to achieve the results of the invention.
shown in the accompanying drawings is to be interpreted
In all of the following figures, the casing and collar
as illustrative and not in a limiting sense.
are identical in construction to those of the preceding
Having thus described our invention, we claim:
described figures and thus they will be numbered the 65
circumferentially around the collar.
They will
1. In a stop collar for mounting tools on the exterior
not be redescribed in each figure’s description. The aper
Referring then to FIGS. 8 and 9, these views differ
of pipe or casing, the combination with a collar having
a minimum diameter providing a free sliding iit between
the collar and the pipe exterior, a circumferentially ex
tending arched passageway or tunnel inside and along the
mid-section of the collar, the walls of said passageway
tapered from the mid-section toward the rims, and an
aperture in substantially the mid-section of the collar and
substantially centrally of the passageway, of at least two
from FIG» 7 in that only one nail is driven into each side
wedge rings insertable in the passageway through said
same, but primed as in the case of FIG. 7.
ture in the midsection of the collar is identical in each
case and will be numbered 13'. In all cases except FIG.
12, the Wedge rings are of the same character as shown
in FIGS. l-6 (particularly FIG. 6) and will be num
bered 12’ generally and their parts numbered 12a’ and
12b', respectively.
5
aperture, at least two pusher wires likewise insertable
throughsaid aperture t-o surround the pipe between the
wedge rings, and at least onel spreader memberv circum
ferentially insertable through the passageway of the collar
and between the two pusher wires whereby to move the
wedge rings toward opposite‘extre'mities o_f the passage:
way, the spreader member` including at least _one nail
6
whereby to move the wedge` rings toward opposite ex
tremities of the passageway, the spreader member includ
ing at least one >nail driven intol the mid=sec`tion of the
collar between the wedge rings having av socketed head
and a following nail adaptedvto~ enter the socket with
its tip and drive the iir’stvnail circumferentially of the
casing, said nails of such diameter vand length _as to cause
driven into the mid-section of the collar between the pusher
wedging of the rings circumferentially around the collar
wires having a socketed head and a following nail adapted
when in place.
to en_ter the socket with its tip and drive the ñrst nail cir
‘
‘
_
‘
n
oumferentially of the casing.
~2. In a stop collar for mounting tools onuthe exterior
5. In a stop collar for mounting tools on the exterior
of pipe yor casing, the combination with a collarV hav
ing a minimum diameter providing a free sliding nt be
of pipe or casing, the combination with a collar having a
tweenthe collar _and the pipe exterior, a circumferentially
extending arched passageway inside and along the mid
minimum diameter providing a 'free sliding ¿tit between the
collar and the pipe exterior, a circumferentially extending
section «of the collar, the walls of said passageway tapered
arched passageway or tunnel inside and along the mid
s‘ection of the collar, the walls of said passageway tapered
from the mid-section toward the rims, and> an aperture
lfrom the mid-section toward the rims of the collar, and
an aperture in substantially the mid-section of the collar
and substantially centrally of the passageway, of a wedge
ring insertable in the passageway through said aperture,
in substantially the mid-section of the collar _and sub
stantially centrally of the passageway, of at least two '
wedge rings insertable in the passageway through said
said wedge ring being of lesser diameter than the height
of the center of the passageway from the outside of the
aperture, at least one spreader member circumferen
casing, said wedge ring substantially circular in trans
tially insertable through the passageway of the collar
verse cross section and a single spreader member of
whereby to move the wedge rings toward opposite ex
tremities of the passageway, the spreader member com~
greater diameter than the wedge ring insertable circum
ferentially of the casing through the aperture of the col
lar whereby to displace said wedge ring toward one of
said rims, said spreader member comprising a nail of
sumcient length to wedge said wedge ring relative said
tapered passageway substantially around the circum
prising a single nail driven into the aperture between the
wedge rings, said nail of insufficient length to wedge apart
the wedge rings substantially around the circumference
of the pipe, the diameter and length of the said nail suñi
cient in combination, however, to cause wedging of the
rings between the collar and the pipe circumferentially
around the collar when inserted between the wedge rings
ference of the pipe, the length and diameter of said nail
sutiîcient in combination with the wedge ring diameter
as to cause wedging of said ring circumferentially around
said collar to prevent motion thereof in one direction,
at least a substantial portion of its length.
3. In a stop collar for mounting tools on the exterior
the nail itself of suñicient diameter relative to the pas
of pipe or casing, the combination with a collar having
sageway to prevent motion thereof in the other direction.
a minimum diameter providing a free sliding ñt between
6. In a stop collar for mounting tools on the exterior
the collar and the pipe exterior, a circumferentially ex
of pipe or casing, the combination with a collar hav
tending arched passageway or tunnel inside and along
ing a minimum diameter providing a free sliding ñt be
the mid-section of the collar, the walls of said passageway
tween _the collar and the pipe exterior, a circumferentially
tapered from the mid-section toward the rims, and an 40 extending arched passageway or tunnel inside and along
aperture in substantially the mid-section of the collar
the mid-section of the collar, the walls of said passage
and substantially centrally of the passageway, of at least
way tapered from the mid-section toward the rims, and
two wedge rings insertable in the passageway through said
an aperture in substantially the mid-section of the collar
aperture, spreader members circumferentially insertable
and substantially centrally of the passageway, of at least
through the passageway of the collar whereby to move 45 two wedge rings insertable in the passageway through
the wedge rings toward opposite extremities of the pas
said aperture, spreader members circumferentially insert
sageway, said spreader members comprising a pair of
able through the passageway of the collar whereby to
nail members driven into the opposite ends of the aper
move the wedge rings toward opposite extremities of
ture in apposite directions between the wedge rings the
the passageway, said spreader members comprising a pair
50
diameter and length of said nails such as to cause wedg
of nails driven into the same end of the aperture in the
ing of the rings circumferentially around the collar when
same direction between the wedge rings, the length of
said nail members are inserted substantially their length
said nails insuílìcîent to wedge apart the rings substan
into said collar between said wedge rings.
tially circumferentially of the pipe, the diameter and
4. In a stop collar for mounting tools on the exterior
length of said nails in combination, however, such as to
of pipe or casing, the combination with a collar hav 55 cause wedging of the rings circumferentially around the
ing a minimum diameter providing a free sliding tit be
collar when said nail members are inserted substantially
their length into said collar between said wedge rings.
tween the collar and the pipe exterior, a circumferentially
extending arched passageway or tunnel inside and along
References Cited in the ?lle of this patent
the mid-section of the collar, the walls of said passage 60
way tapered :from the mid-section toward the rims, and
UNITED STATES PATENTS
an aperture in substantially the mid-section of the collar
189,190
Chapman _____________ __ Apr. 3, 1877
and substantially centrally of the passageway, of at least
2,013,660
Lauer ________________ __ Sept. 10, 1935
two wedge rings insertable in the passageway through
2,836,446
Hall _________________ __ `May 27, 1958
said aperture, at least one spreader member circum 65 2,855,052
Wright et al _____________ __ Oct. 7, 1958
ferentially insertable through the passageway of the collar-
2,898,136
Hall et a1 ______________ _.. Aug. 4, 1959
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