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Патент USA US2112026

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March 22, 193e».l
w. s. JONES
Filed Aug. l, 1935
2 Sheets-Sheet 1
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March 22, 1938.
w. s. JONES
Filed Aug, 1, 1935
2 sheets-'shew 2
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Patented Mar. 22, 1938
Winfield scott Jones, Long Beach, Calif.
Application August 1, 1935, Serial No. 34,163
2 Claims. (o1. 1er-0.4) y
This invention relates to cutters‘for use in
the severing of pipe. '
More particularly the‘present invention has
to do with that form of cutter which operates
5"»within casing or tubing as-‘distinguished from
that type ordinarilylcalled an “outside” cutter.
The present invention has for an «object the
provision of anV inside cutter, the parts of which
are so arranged and constructed that “freezing"
`of the tool within the‘pipe during or after a cut ’
ting operation is prevented.
Another object of theinvention is the pro
vision of a cutter of the character stated, which
permits the cutter to. engage casing or tubing
15‘~“to becutk or to be, released therefrom at the
Will of the operator Without danger of break
ing the cutter blades.
Another object is the provision of an inside
type cutter, the `parts of which are so interre
2 O lated that unscrewing of thecasing pipe due to
>any faulty cutting operation is eñectively over
Figure 3 is a further continued View in lon
gitudinal section of the‘cutter shown in Figure
2 and showing the remaining portions of the
cutter, said View being on the same scale as
Figure 2, and
Figures 4, 5, 6, 7 and 8 are sectional views
taken on corresponding sections of Figures 2 and
3, respectively.
Referring now to the drawings, and specifically
to Figures 2 and 3, I is a coupling having the 10
usual threaded boxes 2 and 3, the threads at 2
being considerably coarser than the threads
shown at 3, and drill pipe or the like d engages
the threads‘Z. Adapted to engage the threads 3
of the coupling is the pin portion 5 of a driv 15
ing mandrel 6. This driving mandrel is formed
with a centralbore l. The end 8 of the man
drel'is provided with a flange 9, the external di
ameter of which is greater than the external di
ameter of the body of the mandrel and this ñange O
is internally screw-threaded at I0. What is`
termed a cutter carrier II has the upper end
Another object of the invention is the provision
of novel means whereby the cutter may be quick
25 ly anchored by mere rotation of the cutter and
released from said anchored `condition by longi
tudinal movement of the cutter.
Another object of the invention resides in the
` fact that the present cutter allows cuts to be
¿gg-made at any Zone below the zone which has
already been cut by first moving the tool longi
tudinally in one direction and then moving to
the zone desired. This is a feature of import
ance because most cutters, so far as the inven
f tor is aware, only permit an ascending action for
the cutting operation, but not a descending ac
Other objects of the invention comprise a cut
ter which is novel in construction,` positive in its
4m operation, and not' likely to require frequent re
pair, and which will stand rough usage.
thereof recessed at I2, this construction pro
viding a flanged head I3. The cutter carrier
proper comprises one or more, in the present
instance three, equidistantly spaced members
provided with dovetailed portions I4 at an angle
to the longitudinal axis of the cutter carrier, con
sidered as an entirety. A flanged nut I5 is re
ceived Within the recess l2 in threaded engage
ment with the threads Iii for holding-the cut
ter carrier to the driving mandrel '6. A wash
pipe I6 in the present instance forms a continua
tion of the cutter carrier, the wash pipe having
the usual longitudinal bore I'I communicating
with a longitudinal bore Ila in the cutter car
rier. The outermost end of the wash pipe is
threaded at I8 for threaded engagement with
a nose or plugA member I9 and this nose or plug
as shown in a certain embodiment in'> the accom
member is provided with a longitudinal bore in
alignment with the wash pipe bore, as shown
at` 26.
The remaining portions of the invention are
all built around the members just described. A
flanged nut ZI is internally threaded at 22 to
an annular body 23. This body' is provided with
panying drawings, described generally, and more
longitudinal slots 2G adapted to house elongated
particularly pointed in the claims. *
keys 25. These keys in turn are received within
key ways 26 formed in the flange 8 of the driv
ing mandrel and in the nut I5. The lowermost
With the above and other objects in view, the
invention consists in the novel and useful provi
sion, formation, construction association, and in
11-51-‘iterrelation of parts, members, and features, all
In the drawings:>
Figure 1 is a fragmentary longitudinal view of
the cutter withinV Well casing, the said cutter
being’in inoperative position,
Figure 2. is a` fragmentary longitudinal'sec
tionalviewion an Aenlargedlscale of a portion of
<, the;cuttenshownlin,.Figure 1, ,
end ofthe body is internally screw-threaded at
21 and internally of the said body and above the
threaded Zone 21 are one or more, in the present
instance three, equidistantlyf spaced apart seg
mental flanges 28.;` The Vasegmental ?langesxìn'v
each instance are transversely channeled or bored,
as shown at 29, and fitted within said channels
or bores are individual cutters 30. In alignment
with the channels or bores and the said cutters,
are transverse openings or bores 3l in the body
and through which openings or bores the cutters
may project, as hereinafter set forth.
The inner end of each cutter is provided with
a dove-tailed groove 32 adapted to cooperate with
the dove-tails lll of the cutter carrier.
Surrounding the wash pipe lli is an annular
nut 33, the upper end of which is threaded at 345,
for engagement with the threads 2l. This nut is
tailed flange ñts within the dove-tailed slot to
allow relative movement between the members
5| and 64. The tripping ring surrounds the wash
pipe and is provided with a central bore 6l of
greater diameter than the wash pipe. This trip
ping ring likewise is internally provided with
screw-threads $8. The nose i9 is provided with a
shank 559 having threads 7€). The diameter of
the shank is considerably less than the diameter
of the threaded cavity 63 of the tripping ring. 10
The threads of the shank are mutilated at 1l,
and a leaf spring l2 has one end secured to the
threaded shank at the mutilated Zone. The re
has its upper end reduced as to diameter and
maining portion of the spring bears against the
threads 68 and normally urges the tripping ring
annularly grooved at 3l. Adapted for placement
in one direction, to-wit: a position such that a
between ends of the nut 33 and of the slip carrier
body 36 are roller bearings 38 confined in the
usual bearing races. Means 39 is provided for
holding the members 3S and 33 in position of
assemblage, this said means including a split
segment of the threads of the shank 69 will en
gage the threads 68 (see Figure 8).
Adapted to be interposed between a washer T3
and the nut 2l and surrounding the mandrel 6 20
is a coil spring lli. This spring 14 urges the
various parts of the invention to assume the
position shown in Figures 2 and 3.
The operation, uses and advantages of the in
annularly grooved at 35. A slip carrier body 36
annulus provided with two spaced apart flanges
adapted for reception within the annular lgrooves
35 and 3l. This split annulus in turn is main
25 tained in position by a rod, wire, or the like 40,
passed through circular bores in both portions
of the annulus, in the well understood manner.
The slip carrier body is provided with one or
more tapered dove-tail portions di, in the pres
30 ent instance three, and the construction is such
that the portions of the slip carrier body carry
ing the dove tails is substantially triangular in
transverse section, as shown in Figure 6. The
lowermost end of the slip carrier body is formed
35 with an annular flange 42.
Movable upon the
dove-tail portions 4I are slips d3 provided with
dove-tailed slots bld. Each slip has pinned there
to a depending link d5, which link is passed
through a slot 4S in the flange ¿52. Surrounding
40 the wash pipe is an annular collar 4l provided
with one or more slots 48 within which slots are
received ends of the links 135, the links being
pinned to said link collar. Below the link collar
is a washer "39 and this washer is secured to the
45 link collar by means 5B constituting a bolt
threaded to the link collar and washer. Inter
posed between the washer ¿i9 and a washer 5i
is means 52. This means constitutes what is
known as a friction arm support and comprises
50 a linked annulus portion 53 surrounding the
wash pipe and provided with upper and lower
aligned radial arms 5d and 55, respectively. In
the present instance, three equidistantly spaced
upper and lower arms are provided, as shown
in Figure '7. A pair of said arms will be de
scribed, the remaining arms being of like con
struction. Both upper and lower arms are trans
versely bored at 5t and 5l. A friction shoe 58,
provided with upper and lower slotted arms 59
and til, is adapted to move relative to the arms
5f@ and 55, it being noted that the pins 55 and 51
pass through the slots 59 and 5S, respectively,
so that its movement is positive.
One or more
coil springs iii lie between a friction shoe and the
65 annulus 53, both members being suitably grooved
to receive ends of said spring or springs. These
springs normally urge the friction shoes away
from the arm supports 54 and 55. The washers
¿9 and 5I are secured to the arms of the friction
70 shoe support by welding or otherwise, as indi
cated for both washers at 62. The washer 5l is
provided with a diametrical dove-tailed slot EES
(see Figure l), and what is termed a tripping
ring 64 has an end 65 thereof formed with a
75 dove-tailed diametrical ñange 66.
This dove
vention just described are as follows:
If we assume that the tool has been lowered
within casing l5, the said tool may be anchored
in the casing at any Zone desired. Usually the
cutter cuts at the “frozen” zone. However, with
the present cutter, it is possible to make cuts at
any zone, even below a zone which has already
been out. Obviously, if the casing or tubing is
cut at the “frozen” zone, it is a simple matter,
.in the ordinary case, to remove all casing or tub
ing above the zone of “freeze”. However, all 35k
cutting operations are not simple and it becomes
necessary to either release the cutter and ascend,
to out further up, or descend, as the case may be.
If we assume that the cutter is lowered within 40
the casing, the parts will be in the position shown
in Figure l, with the friction shoes engaging the
inner surface of the casing. When the zone of
the casing is reached, which it is desired to sever,
the drill pipe ll is rotated to the right. The fric
tion shoes will resist turning movement of the
tripping ring, with the result that the nose i9 will
rotate, due to its connection with the wash pipe,
cutter carrier, the body 23, and the keyed rela
tionship that exists between the body, the man
drel 6 and the coupling 2, with the result that the
nose will be unthreaded from the tripping ring,
and when this occurs, downward movement of
the mandrel 6 will cause downward movement
of the cutter carrier, its associated wash pipe,
together with the nuts 33, and slip body 36, to
move the slips 43 relative to the dove-tailed
flanges lil and bring the slips into engagement
with the casing. During this downward move
ment, the cutters 3U will move along the dove
tailed flanges and outwardly of the openings in
the body. As so far stated, it now becomes evi
dent that the cutter is being held within the
casing or tubing at a Zone below that which is to
be cut, in that the slips are below the cutters. 65
Upon rotation of the pipe fi to the right, and
downward movement of the pipe to move the inan
drel downwardly, the cutters are forcibly brought
into engagement with the casing to sever the
same. If for some reason itis impossible to remove 70
the severed casing, it remaining frozen, upward
movement of the mandrel will bring the teeth of
the nose I9 into engagement with the tripping
ring, with the result that the slips will be moved
again to the position shown in Figure 3 and the 75
cutters moved radially inwardly, as shown in
Figure 2. The tool as an entirety may then be
moved upwardly within the casing and a new
out made.
It is important to note that no relative turning
action occurs between the slip body, the slips,
and the
them shoes,
any to
the member
action. It
is also important to note that the tripping ring
releases upon turning of the ring and re-latches
merely'upon upward movement of the tool, for
the reason that the friction shoes still engage
the casing. The friction ring always moves lat~
erally due to the dove-tailed construction and the
said spring 12 always urges the said movement
in the plane of said dove-tail.
The friction shoe arrangement is such as to
provide frictional engagement between the shoes
and the inside of the casing, utilizing a short
20 length shoe. Most of the cutters known to the
inventor provide a long, bowed, spring. This is
quite unnecessary with the present construction.
A feature of the invention resides in the fact
that by suspending the cutter below that portion
I claim:
1. In a device of the character disclosed: a
driving mandrel, a tubular member secured to
said mandrel, a member provided with an eX«
ternal threaded shank secured at one end of said
tubular member, a disk surrounding said tubular
member, a nut provided with internal threads
and having a greater internal diameter than the
external diameter of the threaded shank, means
between said nut and said disk permitting trans lO
verse movement of said 'nut relative to the longi~
tudinal axis of the tubular member, means nor
mally urging said nut into partially threaded en
gagement with said threaded shank, means se
cured to saidrdisk for frictionally engaging work
whereby rotation of said mandrel and tubular
member unscrews said threaded shank from said
nut, and longitudinal movement of the mandrel
and tubular means causes the said threads to
again engage.
2. A cutter including a mandrel, a body in
part surrounding and keyed to said mandrel, a
cutter carrier conñned within said body, cutters
secured to the cutter carrier, said cutter carrier
ofthe casing to be cut, it is possible to release ' formed with an inclined face adapted to move
the cutter by merely lifting the same whereas
when a cutter is suspended in that portion of the
casing that is to be out, after a cutting operation,
difficulty may be encountered in removing the
tool, for the reason that if the tool is revolved,
say, to the right, to aid in this release, with the
blades caught, the casing may turn along with'
the turning of the drill pipe, with the result that
the casing is unthreaded from the diiïerent col
lars. This is impossible of occurring inthe pres
ent tool.
AAnother feature resides in the fact that on
driving downwardly through the mandrel, torque
is not transmitted to the blades or to the cutter
carrier upon rotation of the mandrel, forV the
reason that the mandrel is keyed by keys 25 to
the housing or body 23.
The coil spring 14, as before stated, at all times
tends to urge the members into the position
. shown in Figures 2 and 3, and thus moves the
cutter blades inwardly.
the cutters outwardly of the body when the cutter
carrier is moved in one direction, an elongated
wash pipe secured to the cutter carrier, a slip
body surrounding said wash pipe and rotatable
relative to the body surrounding and keyed to
the mandrel, slips carried by the slip body, fric
tion means connected to the slips below the slip
body and adapted for frictional engagement with
work, a member secured to the lower end of the -.
wash pipe provided with a threaded shank, and
a member secured to the friction means and
transversely movable relative to the axis of the
wash pipe and provided with threads adapted
to engage the threaded shank; said friction means 40
Yhaving limited longitudinal movement relative
to the slip body whenl the transversely movable
member is unthreaded from the threaded shank.
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