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Патент USA US2124617

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July 26, 1938.
Filed June 25, 1937
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Patented July 26, 1938
_ 2,124,617?
CASING oU'r'rER,„ f
Rober-til. Greenawalt, Conoquenessing, Pa.
Appliéation June-23,4937, serial No. 149,804
s claims.. (o1. 1cm-0.3).,
This invention relates to‘pipe cutters, andmore
On one of its flat sides, the body i‘s‘recessed, as.’
in particular to cutters for cuttingor‘slotting the--
at 6, tojaccommodate a cover ‘I su'italzìly'shapedI
casings of abandoned oil-wells," etc.;4 placed veryÁ to conform to the general contour ofthe ~body
deeply in the ground.
and secured Nthereto=-loy=meansvof- screws '8. A
One of the primary objects of this' invention is deeper- »recess'9 is also cut to freely accommodate
to provide a tool for cutting casings inabandoned the casing ëcutterrproper' I0, the cutter-springvli "
wells, wherev said casingscannot be pulled out and the dog I2?.v ’On'the rear, cylindrical, side` of .î
directly because of sediment .or dirtf settlingl the~body- there-'is cutla longitudinal- groove»-I3`
around the lower joints, or wherezthe casingsî
10 cannot be extracted because of the absence on
the site of suitable derricks‘or other heavy ‘ma
chinery usually needed forthe purpose.
Another object of this invention is to provide a'
tool which can be -easily and quickly adjusted to
out casings of ,different diameters.. A .further
object is the provision of a cuttingtool which is
very simple in construction and application, rela“
tively light in weight and which, by .actual ex
periencein the ñeld, has proven .to fbelveryv effr-A
cientran-dquick in the performanceof itslpur
Additional .features and advantages of _this invf
vention Will appear inthe course'` of the follow*
wherein insert-strips'cf variousfdepths may be
insertedlto adapt the tool to casings of'diiîerent'
bores.> Pins or screwsv I5'are »used tofsecure* the
insert strips I 4-~in the ¿main/body. »f The lower
part of the cylindrical front sidelof `tlf1e"bocly.isl
preierablycut partly awayV to produce a ñat face
I6,` to' betterik expose the'sharpfend-of the cutter,
reduce the `weight of lthe Ywhole tool- and also
facilitate LitsI introduction'- in the casing to be
TheV casing"` cutter -' I Il' -is »made-of »tool `steel and
its- -lower end=-is tapered l‘upwardly towardsthe f
rear, as at I1,- to provide a favorable‘leutting angle.
'I'he ' actual cutting-knife ' -I 8 is substantially nar
roWer thanthe ' 'cutter- and 'f‘ is i' placed; 'thereon
ing description considered `in_.connection with. centrallmjthus »providing the two-shoulders ¿I9
the accompanying .drawing‘formingapart oi this
which act -as-stops‘to' limit theI depth off-the cut,
so` - that the` 'cutting `Will-¿be limited‘praetically Ato
lînthe drawingz-~
the~thickness of the `casing-1and-'notlmaterially
Fig. l is a front'elevation-of .the casingi‘cutting. -affect the-coupling of Athe sama-thereby con
siderably reducing» the task imposed on the. cut--v
Fig. 2 is a sideelevation thereof, Withthe re
ting tool. '
movable cover. taken oiî and the cutter proper..
The'upper-end- of--thecutter is rounded, as atI
shown in operative position.
20, `and has a drilled-hole 2 I» which freelyreceives
Fig. 3 is a similar View, but with the cutter held- a pivot'-pin.-22«»'-`mountedy in the-main bodyîand von
in inoperative position.
Fig. 4 is a top plan view of the `cutting-tool.44
Fig. 5 is an enlarged fragmentary sectional"
which th'elcutter is pivotedi The-rounded endof .
the cutteriñts into» the'accordingly rounded bot- l»
tom 23 of VthezV-shaped‘.socket 24'cut` inthe .main
View showing, the .cutting tool in._.a_We1l-'casing,_ body..~ Thetsides 125i and.. 2610i .-_this ¿socket-fare
the lower pipe section of~ which has been partly"- suitably »inclinedfitoçrallowf-.the required- angular»
slotted longitudinally to free itfiromitscorre
movement of the cutter. Theîreasonvfor making
spending .pipe coupling, upon exerting an upward the hole 2 I largerl thanthefdiameter ~ of the -pin A22
pull on the upper part of the well-casing..
isto .relieve thelatter of~any~stress imposed dur
Fig. 6 is a cross-sectional vievvA takensubstan
ing the slowing-operation». on..a casing, these
tially. on line 6--"-6 in Fig.. 5." ' '
stressesfbeing, _absorbed by the` rounded» bottom.
Fig. 7 is a< perspective View of 'the cutteror` of ytheA socket,..while the. outward. `flaring thrust
knife properìof thecutting tool. .
Fig. 8 is a .sectional longitudinal ’viewthrough
a casing-line in which the casing cutter has `been
lowered in position `readyto partlyslot, longi-L
tudinally, the lowermost length of casing. _.
Reference being had to the drawing, _the casing`
cutting. tool comprises a main body.I of parti"
cylindrical cross-section, having _at its upperend
a tapered portion 2 provided with suitable pipe
threads v3 surmountedby a straight Acylindrical
shank #and a straight,‘threaded; stud‘5`:
* ' ‘
of. .the `cutter...1's `limited ..and.- resisted by the,` ' “
bevelled side25 of the saidsocket.
The ...cutter is acteduponbya .spring of any
desired >and suitable'type, such as. the wire spring
II, securedinthe recessßbymeans of vpins or..
screws 2'I. 'I‘he tendency Yof .this spring isto force
_the cutter .outwardly intov eiïective, or. slotting,
position, as Will be readily understood.
In ordento faciliate’the lowering of the out:
ting tool intoa casin'gg,thejcutter‘rnustV be Withr;`
dravvn‘inton thema-in Ybody; this~is ' accomplished"
by means ofthe »dog I2, pivotally mounted at its>
upper end on a pin 28 secured in the main body,
said dog having an angularly disposed catch-lug
29 adapted to engage the lower end of the cutter.
At the rear of the cutter there is secured by
screws or pins 30 the ñat, resilient, foil 3|, the
free end of which is suitably curved upwardly and
which, when the dog engages the cutter, extends
somewhat beyond the outer periphery of the Afront
ward pull is exerted on >the upper string of cas
From the above description, the mode of ap- ì
plication and operation of this device will be
readily understood and may be briefly described 5
to be as followsz-As is well known, an oil-well Y
consists of a series of casings 5I! driven into the
ground and secured together by means of threaded
pipe couplings 5I. The length of kthe threads
in the latter isv such as to leave a clearance 5,2,
10 side of the cutting tool, so that, whenvthe latter . ’ varyingrfrom one-'half inchy to over .an inch, be- .
is lowered 'into' a casing,l the ‘foil v'will assist in tween two juxtaposed casing-ends. ’
holding the cutter in its withdrawn position. On
When the casing of an abandoned well is to be
the other hand, when the cutting tool is pulled. -salvaged, the depth of the-recoverable casing is
upward in the casing, the friction between the first-measured by locking the cutter I0 into in
15 latter and said foil will cause the disengagement’ operative position, by means of the above men
of the dog from the cutter, and the latter will tioned cotter-pin inserted in the hole 32, and low
assume the operative positionshown in Figs. 2, 5 ~ ering the tool into the oil-well as far down as
t and 8.
possible, that is, until the tool strikes an im
The diameter of the body of the cutting tool is passable body of sediment-which may have ac~
20 made such as to suit the bore of the smallest cas
ing generally used in oil-fields. If larger casings
are to be cut, an insert-strip I4 of suitable depth
may be readily substituted in the longitudinal
groove I3, by simply extracting the pins or screws
25 I5, removing the small insert-strip and inserting
instead a larger one which is, properly secured in
place by replacing the holding means I5.
In theY front of the cutter, there is Ydrilled
through the main body I a hole 32 for the inser
30 tion therein of a Cotter-pin (not shown) , or the
` like, whereby thecutter may be held positively
within the body without the assistance of the
dog I2, which is also held within the main body
by gravity. This pin is used yat the time when
35 the depth of the oil-well is to be measured to as
certain the amount of casing which may be sal
vaged. If desired, a string or cord (not shown)
may be attached to said cutter-pin, or to any other
desired part of the cutting tool, and the length
of said cord measured to determine the free
depth of the well.
The various accessorial parts used in connecfv
tion with the cutting tool are shown in Fig. 8.
To the threaded portion 2 of the cutting-tool is
secured by means of the pipe coupling 33 the so
called “weight-pipe” 34, measuring about twelve
feet and provided at its upper end with a cen
tering device intended to guide the tool in the
casing. As shown, this centering device com
prises a collar 35 screwed on the weight-pipe and
cumulated in the casing, or a so-called “packer”
whichhad been purposely forced into ythe lower
most casing-length at the time the exploitation
of the well was stopped, to prevent the entrance of
mud, sand, etc.
N) Cn
If the recoverable casing isrof sufficient value to
justify further labor, the cutting tool is again
lowered into the well, the cotter-pinhaving first
been removed and the cutter I0 held in inopera
tive position by means of thedog I2. When the 30
tool reaches the lowermost position, which factV
may be easily ascertained by the nature of the
sound produced by the impact of the tool, the
latter is slowly raised, whereby the dog I2 will
disengage the cutter Ill, and the latter, due to the 35
spring I I, will then snap into the clearance space
52 between the next following juxtaposed cas
ing-ends. This condition will be shown by the
failure of the tool to drop when the tension in
the'cable-line 49 isreleasedV and by the metallic
sound produced by the impact, showing that the
edge ofthe cutter I0 is resting directly on the
upper end of the lowermost casing-length 5D.
At this stage, an upward pull Von the line of cas
ings is exerted by meansV of a pulling machine, or
a tractor with rope-blocks, and the sinker-rod
and jar are now alternately raised and dropped
by means of an engine and reel for the cable 49
mounted on a small truck. The impact due to
the weight of the sinker and jar on the jar-guide 55)
will be transmitted to the cutter I0, and the lat
ter will speedily cut through the casing a longi
tudinal slot 53 (Figs. 5 and 6), which will cause
the collapse of the slottedcasingend, owing to
the strong upward pull exerted on theV upper
string of casings. TheV latter will jerk up away
from the lowermost casing-length and may beV
pulled out altogether by means of the above
having suitably shaped resilient ñngers 36 which
`yieldingly engage the inside of the casing. Also,
to the stud 5 is screwed the cylindrical plug 31
having a reduced shank 38 to» which is fastened
55 by means of the pin 39 the tubular jar-guide 40,
approximately three feet long and having at its
upper end a guide and stop bushing 4I provided
with an outward iiange 42 resting on the upper mentioned pulling machine, etc.
Numerous applications of this cutting tool in 60
end of the jar-guide.
Longitudinally movable within the jar-guide is ' oil-fields have proven that casings may be cut for
the jar proper comprising the lower guide-col
extraction from deep wells in much 'less time,
larl 43, the plunger-rod 44 and the head 45 having with considerably less help and very much lighter
a threaded stud 46 to which a heavy sinker-rod machinery, thanV is required with the various
4'I, about twelve feet long, is secured. At the tools Yor methods now in common use.
As will be understood, there may be changes
upper end of the latter there is screwed the eye
socket 48 to which israttached the lower end of made in the constructionV and'arrangement of the
the'cable 49 by means of which the jar may be details of this invention without departing from
raised as high as the stop bushing 4I will permit. the i'leld and scope of the same, and it is intended
When the jar is suddenly dropped, its head 45 to include all such variations, as fall within the 70
70 strikes the guide~bushing flange 42 and the im
sphere of the appended claims, in this applica
tion in which the preferred form only of the in
pact is transmitted to the casing-cutter I0, where
by a slot of sufficientlength may be cut in the vention has been disclosed.
I claim:
upper end of the lowermost casing 50, to free
1. A cutting tool for casings and the like, com
prising a main body; a casing cutter rockably
mounted at its upper end within the body;
means to limit rthe rocking movements of said
cutter; spring means to force the cutter into op
erative position; locking means effective on the
lower end of the cutter to hold same into inop
erative position, and means positioned on said
locking means to automatically release the cut
ter into operative position bythe upward travel
10 of the tool within a casing.
2. A cutting tool for casings and .the like com
prising a main body; a casing cutter rockably
mounted at its upper end within said body; means
to limit the rocking movements of said cutter;
15 spring means to force the cutter into operative
position; a detent rockably mounted in said body
means to limit the rocking movements of said
cutter; spring means to force the cutter into
operative position; locking means efiective'on '
the lower end of the cutter to hold same into in- ,
operative position; vmeans positioned on> said
locking means to automatically release the cut
ter into operative position by the upward travel
of the tool within a casing, and means to limit the
penetration of said tool through Ythe Wall of said
5. A cutting tool for casings and the like com
prising a main body; a casing lcutter rcckably
mounted at its upper end within said body; means
to limit the rocking movements of said c_utter;
spring means to force the cutter into operative
position; locking means effective on the' lower
end of the cuttervto hold same into inoperative
and effective on the lower end of the cutter to
hold same into inoperative position, and means position; means positioned on said locking'means
positioned on said detent to automatically re
to automatically release the cutter into operative
20 lease the cutter into operative position by the position by 'the upward tra-vel of the tool within
upward travel of the tool within a casing.
a casing, and means positioned on the cutter to
3. A cutting tool of the character described limit the penetrationthereof through the wall
comprising a main body; a casing cutter rock
of said casing.
ably mounted at its upper end within Vsaid body;
6. A cutting tool for casings and the likevcom
25 means to limit the rocking movements of said
prising a main body; a casing'cutter rockably
cutter; spring means to force the cutter into op Y mounted at its upper end within'said body;
erative position; a detent rockably mounted at means to limit the’rocking movements oi”> said
its upper end in said body and having at its cutter; spring means to force thecutter into op
lower end a lug adapted to engage the lower end erative position; locking means effective onthe
30 of said cutter to hold same into inoperative po
lower end of the cutter to hold same into inop
sition, and a resilient member positioned at the erative position; means positioned on said lock
lower end of said detent constructed to auto
ing means to automatically release thel cutter
matically release the cutter into operative posi
into operative position by the upward’travel‘ of
tion by the upward travel of the tool within a the tool within a casing, and means integral
35 casing.
with said cutter to positively limit the penetra
4. A cutting tool for casings and the like com
tion thereof through the wall of said casing.
prising a main body; a casing cutter rockably
mounted at its upper end Within said body;
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