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_ April 1, 1947.
7
D. H. REED
2,418,278
OUTSIDE PIPE-CUTTER
Filed Aug. 24, 1.945‘
2 Sheéts-Sheet 1
DEMPSON I-LPEED.
INVENTOR.
93%
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- *7E4'Zd?
A's-re NEY§
April '1, 194?.
2,418,278.
D. H. REED
OUTSIDE PIPE-CUTTER
Filed Aug. 24, 1945
2 Sheets-Shée’r. 2
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Patented Apr. 1, 1947
‘ 2,418,278
UNITED ‘STATES PATENT" OFFICE.
2,418,278
OUTSIDE PIPE CUTTER
Dempsoni “IAI.'Reed,,Houston, ‘Tex. 1
Application August .24, 194'5,'Serial No. 612,340
11‘ Claims. (Cl.‘?164—0.6)
‘2
1
The. invention relates to an outside pipe-cutter
side pipe-cutters wherein the friction driving
.of'the compensating typeso as to provide ‘a grad
rings are ‘so constructed as to be unaiiected by
uated frictionaldrive to accomplish the cutting
‘the ?ow of flushing fluid.
action.
Still another object of the invention is to pro
The present pipe cutter is in .the nature of an U! vide an anchor device for outside pipe-cutting
tools which may be operated to move into pipe improvement over that shown in my prior patent,
2,213,049 issued August 27, 1940.
In the operation of an outside pipe-cutting
engaging position by the application of hydraulic
pressure.
Another object of the invention is to provide ‘a
.tool in a well bore .for the purposenoi severing
pipe great dif?culty is encountered due to var 10 control ,,mechanism for advancing the outside
ious conditions such as the particular position
pipe-cutters against the pipe said mechanism in
cluding a ‘spring loaded compensating friction
or inclination of the pipe, the hardness of .the
material of the pipe, and the fact that thetool
‘drive.
‘Other and further objects of the invention will
must operate in a medium of drilling ?uid or
‘be readily apparent when the following descrip
abrasive slush. An outside pipe-cutter in ama
tion is considered in connection with‘the accom
jority of instances is usedin cutting off sections
panying drawings, wherein:
-.of drill pipe which is usually made of high car
Fig. 1 shows the outside pipe-‘cutting tool in
bon steel having a relative .thick wall so that it
vertical elevation with :one quarter cut away to
“isdi?icult to out and thetool must be operated
in the annularspaoe around the outside of the " illustrate an internal arrangement of the parts.
ameter of the welliboreorcasing therein.
.Fig.‘ 2 is'an .enlarged’sectional view ofthe pipe
.cutter. anchoring mechanism.
With the ‘foregoing ‘ conditions in mind, vit is
obvious that an adjustment of the cutters for one
illustrating the 'spllned arrangement of‘thejparts
, pipebeing cut andiwithin the con?nes of the di
‘set of i circumstances may not‘cause the cutter
.to operate asieffectively under other conditions
.and thatva setting of the cutters before the tool
is, lowered into the wellbore may di?eriasebeing
an improper setting when the conditions .down
Fig. 3 is a transverse-section through ‘the tool
to effect rotation of onepart vwith respect'to the
other.
.Fig. 4 is a vertical sectional view illustrating
the spring loaded compensating adjustment for
‘ the driving mechanism.
Fig. 5 is a section illustrating the ratchet dogs
in the well are encountered. It is thereforede 30
of the compensating driving-mechanism.
sirable to provide a‘tool wherein the power tend
.Fig. 6 is a transverse'section looking down‘on
.ing'tojadvance the cutters may be adjusted or
varied, depending upon the conditions'encoun
teredpbecause a driving force which‘would ad
vance the cutters at one location or againstone
‘portion of the pipe.‘ might be entirely inadequate
when used in making another out.
It is therefore‘ meet the objects of the inven
tion to provide an outside pipe—cutting tool
wherein the frictional driving ‘force tending to
.advance the cutters to perform 'thecuttingac
.tionrmay beadjusted;byimanipulationof the tool
while it is in positioninthe well bore. .
‘Another. object :of :the :inventionris to provide
an .outside pipe-cuttinggtool wherein the driving
mechanism iforiadvancing the. cutters may be ad
justed for increasing ‘the driving .forcezby. manip~
ulationof the‘ tool in :theiwell here either before
or during the ‘cutting :action.
.Another object of .the invention istoproyide
v.adriving mechanism .ior advancing the cutters
in :.an ‘outsideniDe-cutting tool which can be ‘ad
,justed by backing up the tool.
.still another object of .the invention. isv tohpro-i
vide a compensating driving mechanism for out
the construction of Fig. 5.
.Fig. 7 is an enlarged detailed View illustrating
the cutters as having severed the pipe.
Fig. .8 is a transverse sectional view through
‘the tool looking down on the cutting members.
Fig. ‘9'is a broken away side elevation looking
at‘the cutter member advancing mechanism.
In'Fig.i1the pipe or ?sh 2 which is ,to be sev
eredisillustrated as .a piece of heavy drill pipe
having a coupling 3 thereon. For somereason
‘.orrother this pipe 2 has become .lodgedor stuck
.in the ‘well .boreand cannot beremoved. ‘The
sing lowered
over the pipe 2 witha viewofsevering the upper
section .6 of the pipe from the lower portion '1
which is lodged in the hole.
This; pipe cutting tool .5 is arrangedtobelow
cred into the well bore andimanipulated by an
operatingpipe? which. is threaded at 9 into the
body or housing o-fwthe-tool “It. This housing is
arrangedto .contain'the various mechanisms of
.the cutting ,tool and .at the upper end .there‘are
arranged a plurality of ‘dogs or “pipe "engaging
‘ outside pipe cutting .tool 5Lis thus
2,418,278
'
'
4
3
members II which are mounted on a bushing l2
so as to seat on the shoulder _|3 thereof. These
rings 33, the compensating rings 38 has an anti
dogs are normally pressed inwardly by a leaf
plurality of coil springs 44. These coil springs
spring l4 and have a tooth inclined edge l5
thereon to engage against the shoulder l6 of the
coupling or tool joint 3.
The springs |4 normally urge these dogs or
urge the ring 45 upwardly toward the shoulder
34. This ring 45 carries a plurality of studs 45
engaging members inwardly toward the pipe but
the lowermost one of the friction rings 33. In
they are enabled to move backwardly so as to
this manner there will be a spring loaded com
friction bearing 43 thereon which supports a
projecting through the openings 41 in the shoul
der 34 bearing against the lower surface 43 of
snap by the collars‘ 3 which are passed on the 10 pressive force applied to the friction rings tend
ing to compress them together and increase the
way down.
'
frictional resistance to sliding. It seems obvious
Fig. 1 shows this anchor mechanism as having
that by varying the vertical position of com
been locked or latched in pipe engaging position
by moving the ?ange 20 of the sleeve 2| in be
pensating ring 38 by relative turning between
hind the up-per end of the dogs. This is accom
15 such ring and the. pins 4| that the ring will be
plished by the application of hydraulic pressure
raised due to the threads 31, Any upward move
This
ment therefore will increase the compression on
sleeve is normally urged upwardly by the coiled
spring 23 seated on the shelf 24 carried by the
cylinder 25. This cylinder is in turn retained
in position by the set screws 25 on the bushing
the springs 54 and consequently increase the
frictional driving effect on the shoulder 34 and
the driving skirt 35.
to the upper surface 22 of the sleeve 2!.
Fig. 3 shows every other one of the rings 33 as
being provided with notches on the outer pe
riphery to engage corresponding splines in the
Normally the flange 20 will be spaced above the
driving collar 35 while the alternate‘ rings will
upper end of the dogs due to the force of the
coil spring 23 so that the dogs can slip past the 25 be splined on the inside of the periphery to en
gage the driving skirt 3|. In this manner half
cduplings 3. When it is desired to set the tool
of the rings will be held stationary with the driv
a pump pressure through the operating pipe 8
ing skirt and half of them will be compelled to
will be increased so that the resistance to ?ow
move with the driving collar.
.
'
p
'1
‘downwardly through the tool will be applied to
The driving collar 35 is splined into the driven
the surface 22 on the upper end of the sleeve 2|. 30
member 50 which is threaded with a coarse
In this mannertheflange 2|] will move in be
thread 5| into the nipple 4D. This member 53 ~
hind the dogs to accomplish the locking thereof
is thus arranged for relative vertical movement
so that a subsequent upward pull on the tool to
due to these threads 5| but is compelled toro
. effect the cutting action will not dislodge the
tate with the driving collar 35. If this assembly '
tool because the anchor mechanism will be se
21 as best seen in the left hand side of Fig. 2.
curely locked.
>
This anchor mechanism, including the bushing
I2, is supported on the anti-friction bearings 28
supported upon a rib 23 of the housing l0.
Threaded to the bushing l2 at 35 is the driv
ing skirt “projecting below the rib-23. . This
driving skirt has an off-set 32 thereon which
is arranged to have the set of friction rings 33
rotates as a unit, then the driven member 50 will
not negotiate any vertical movement.
7
This driven member 50 has circumferentially
spaced thereon the cross pins 52 upon which'are
mounted the links 53 for ' pivoting movement.
These links are in turn pivoted at>54 with the
cutters 55 which are carried in thegcutter arm
56 pivoted at 5‘! in the housing H] of the tool.
If the driven member 55 moves downwardly due
raised upwardly against its lower surface. These
friction rings may be provided in any desired 45 to the relative turning between such ~r_nember
and the nipple 40, then a block portion’ 55 thereon
number and are offset in size and provided with
is arranged to slide on the surface Bil on the cut
transverse grooves or slots 36 as best seen in
ter arm 55 so as to cause relative sliding move
Fig. 4. These slots and offset sizes permit the
ment from the position of Fig. 1 to the position
flow of ?uid past the rings in actual use so that
there will be no building up of hydraulic pressure 50 of Fig. '1 when the cutter is fully advanced. The
pin 54 has a ?attened side or area 52 thereon‘ as
on the rings, which might interfere with the fric
seen in Figs. 1 and '7 which serves to lock thev
tional resistance or drive as will be later ex
cutter 55 against any tilting movement‘where it '
plained. These rings are supported upon the
bears against the surface of the block 59. ' _
shoulder 34 of the driving collar 35. This driv
ing collar is movably arranged within the hous
The links 53 prevent the cutters from advanc-'
ing i0 and is threaded at 31 to a compensating
ring 38 which rides on the surface 39 of the nip
ing more than the - predetermined) amount at
ple 4|) which is threaded at 4| to the housing Hi.
The nipple 43 has a plurality of upstanding pins
as to prevent gouging of the pipe.
which the driven member moves downwardly so
’
v' H '
It seems obvious that with the foregoing _con~
4|’ thereon best seen in Fig. 6 which are ar
struction, ready adjustment of the frictional driv
ranged to be received in the notch 42 of the pawl
43 which is hinged at 43' on the compensating
ing action can be had because‘ when the out is
started, and if the, operator ?nds that'the-re
ring 38.
sistance to cutting is such that the cutters'do'not
advance, it is only necessary'for him to stop the
In this manner when the housing I3 is rotated
by the operating pipe 8, the pins or studs 4| will 65 clockwise rotation of the tool and back it up a .
move in an accurate path beneath the pawls
desired amount so as to cause the pawls '43 to
43 while the compensating ring 38 is rotated
click over the pins or studs’ 4|;
This turning
with the housing at a slower rate,‘ dependent upon
movement causes the threads 37 to move the com
.the friction between the fritcion rings 33. The
pensating ring 31 upwardly which'increases the
driving collar 35 due to the threads 31 will have 70 compression-on the springs 44 and moves the
a tendency to rotate with the compensating ring
and in this manner the shoulder 34 will tend to
carry the friction rings 33 around with it.
studs 46 against the friction rings with a greater
force.
The rotation of the tool in a clockwise
direction can then beresumed and the, friction
7 In order to vary the friction driving force im
tending to drive’ the driven member 5|] has thus
parted to the driving collar 35 by the friction 75 been increased. It seems obvious that thefric
2,418,278
5
6
tional driving force can thus be adjusted to apply
the desired force tending to advance the cutters
to negotiate the cut iii in the pipe 2.
construction including an anchor to engage the
pipe, cutters to cut the pipe, and a friction, drive
between said anchor and cutters including a
plurality of friction rings, a drive sleeve to be
Broadly the invention contemplates a com
pensating outside pipe-cutting tool where the fric
moved longitudinally by said rings to cause ad—
tional driving force tending to advance the cut
vance of the cutters, and means to adjust the
ters can be adjusted while the tool is in the well
frictional pressure on said rings.
bore, depending upon the resistance encountered.
8. An outside pipe-cutting tool cutter driving
What is claimed is:
construction including an anchor to engage the
1. An outside pipe-cutting tool including a 10 pipe, cutters to cut the pipe, and a friction drive
housing, means to anchor said housing against
between said anchor and cutters including a plu
upward movement on the pipe being out including
rality of friction rings, a drive sleeve to be moved
means to contact the pipe, and means movable
longitudinally by said rings to cause advance of
by the flow of liquid pressure in the tool to move
the cutters, and means: to adjust the frictional
said anchor means into ?rm biting engagement
pressure on said rings, including a spring.
with the pipe.
9. An outside pipe-cutting tool cutter driving
2. An outside pipe-cutting tool including a
construction including an anchor to engage the
housing, means to anchor said housing against
pipe, cutters to cut the pipe, and a‘ friction drive
upward movement on the pipe being cut includ
between said anchor and cutters including a plu
ing means to contact the pipe, lock means mov- ,
rality of friction rings, a drive sleeve to be moved
able by the ?ow of liquid pressure in the tool to
longitudinally by said rings to cause advance of
move said anchor means into engagement with
the cutters, and means to adjust the frictional
the pipe, and spring means to release said look
pressure on said rings, including a spring and
upon reduction in the ?ow of liquid.
means to adjust the pressure of said spring
3. An outside pipe-cutting tool including a
against the rings.
housing, means to anchor the tool against upward
10. An outside pipe-cutting tool cutter driv
movement on the pipe, pipe cutting members in
ing construction including an anchor to engage
the housing, a friction driving means operable
the pipe, cutters to cut the pipe, and a friction
against said anchor means to advance said out
drive between said anchor and cutters including
ter to cut the pipe, including a plurality of fric
a plurality of friction rings, a drive sleeve to be,
\ tion rings.
moved longitudinally by said rings to cause ad
4. An outside pipe-cutting tool including a
vance of the cutters. and means to adjust the
housing, means to anchor the tool against up
frictional pressure on said rings, including a
ward movement on the pipe, pipe cutting mem
spring and means to adjust the pressure of said
bers in the housing, a friction driving means
spring against the rings while the tool is in use
operable against said anchor means to advance
in a well.
said cutter to cut the pipe, including a series of
11. An outside pipe-cutting tool cutter driving
friction rings, and an additional means to adjust
construction including an anchor to engage the
the frictional pressure of said rings to vary the
pipe, cutters to cut the pipe, and a friction drive
driving force advancing said cutter.
between said anchor and cutters including a plu
5. An outside pipe-cutting tool including a
rality of friction rings, a drive sleeve to be moved
housing, means to anchor. the tool against up
longitudinally by said rings to cause advance of
ward movement on the pipe, pipe cutting mem
the cutters, and means to adjust the frictional
bers in the housing, a friction driving means op
erable against said anchor means to advance said
cutter to cut the pipe, including a series of fric
tion rings, and an additional means to adjust the
frictional pressure of said rings to vary the driv
ing force advancing said cutter by backing up
the tool relative to said anchor means while such
means is engaged.
6. An outside pipe-cutting tool including a
housing, an anchor to engage the pipe being cut
so as to position the tool, cutters in the housing,
and a friction drive to advance said'cutters in
cluding means to adjust such drive while the tool
is in cutting position in the well.
7. An outside pipe-cutting tool cutter driving
‘ pressure on said rings, said rings having recesses
therein to allow the ?ow of ?uid between and
around the rings so that such fluid will not affect
the frictional pressure on the rings.
DEMPSON H. REED.
REFERENCES CITED
The following references are of record in the
?le of this patent:
Number
UNITED STATES PATENTS
Name
Date
2,213,049
Reed ____________ __ Aug. 2'7, 1940
2,325,104
Brown __________ __ July 2'7, 1943
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