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Патент USA US2128593

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Ag. 30, 1938.
c, R, PHILUPS
2,128,593
TUléING AND CASING STRIPPER FOR WELLS
Filed April 14, 1958
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2,128,593
Patented Aug. 30, 1938
UNITED STATES
PATENT OFFlCE .
2,128,593
TUBING AND CASING STRIPPER FOR WELLS
Charles R. Phillips, Mannington, W. Va.
Application April 14, 1938, Serial No. 201,969
4 Claims. (Cl. 164—0.3)
This invention relates broadly to a tool ‘for fa
cilitating the withdrawal and removal of tubing or
casing from wells, and more particularly to a tool
adapted to be used in the freeing of certain sec
tions of well tubing or casing that offer obstinate
resistance to withdrawal. '
One of the objects of the invention is to provide
a cutting tool or “casing ripper” adapted to be
lowered into the tubing or casing of a well and
then operated to cut or slit the lower end of a sec
tion of tubing or casing so that said section may
be pulled or stripped from a coupling or collar
by means of which two adjacent sections are con
nected.
'
-
.
Another object of the invention is to provide a
tool of the character referred to wherein the cut
ter blade may, after performing its desired func—
tion, be automatically retracted toinoperative po
sition out of contact with the tubing or casing,
thus facilitating removal of the tool from the
well. ‘Such automatic retraction of the cutter
blade after cutting prevents objectionable mutila
tion of the coupling; prevents the blade from per
forating the casing after slitting the tube, and
prevents the blade from being broken by engage
ment with the wall of the well.
With these and other objects in view, the in
vention resides in the features of construction, ar
rangement of parts, and combination of elements
30 which will hereinafter be described, reference be
ing had to the accompanying drawing, in which—
Figure 1 is a side elevational view of the device
in a well tubing or casing;
Figure 2 is a detail view, in side elevation, of the
cutting mechanism, parts thereof being broken
away;
Figure 3 is a front or face. view of the same;
Figure 4 is a sectional view taken on line 4-—4
of Fig. 2; and
Figure 5 is a detail view of an end of a section
of tubing or casing after slitting.
The device comprises a rod 1 having leaf
springs 2 attached thereto for properly guiding
and positioning the tool in the tubing or casing 3.
The housing 4 for the cutting mechanism is lo
4.5
cated at the upper end of the rod I.
Snugly re
ceived within a pocket 5 provided in the housing
t and maintained therein by .a pin 6 are spaced
plates 1, the latter being fastened together to
form a unit by rivets 8. Each plate ‘I has a slot 9
provided in its wall .and slidably received within
each slot 9 is a slide block it. A pin ll connects
the two slide blocks and pivotally supported on
said pin H intermediate the plates 1 is the cut
ting blade l2, the cutting point or edge normally
protruding outwardly of the tool and in contact
with the tubing or casing by reason of the provi
sion of a spring pressed pin I3 which underlies
the blade l2 adjacent its inner end and exerts an
upward pressure thereon.
Said spring and pin l3 are housed in an aper
ture provided in a spacing member I5 interposed
between the two plates 1 below the cutter l2, and.
the upper end of said spacer terminates in a
shoulder I6 whose forward edge abuts the inner 10
extremity of the cutter [2. As shown in Fig. 2,‘
the inner extremity of the cutter i2 is curved on a
radius corresponding to the curvature of the for
ward end of the shoulder so that the two elements
snugly inter?t. When in this position, the slide 15
blocks H) occupy a forward position in the slots 9
and the cutting edge of the blade l2 protrudes
from the tool in operative position.
When it is desired to strip a section of the tub
ing from a well,- the device is lowered into the
tubing 3 by a cable (not shown) until it reaches
the desired point, which point is always at a loca
tion in the depth of the well where two sections 3
are joined together by .a collar I'I. During lower
ing of the tool into the well, the cutter blade I! 25
frictionally rides inoperatively against the tubing
3 and against the pressure exerted by the spring
presed pin l3. When, however, the point to be
severed is reached, the spring impelled cutter I2 is
forced outwardly beneath the lower end of the
section of tubing 3 and the leaf springs 2 fric
tionally contact the inner surface of the well tub
ing and function to maintain the tool in operative
position, as illustrated in Fig. 1.
With the tool so positioned it is drawn up
wardly by its supporting cable. Such elevation
results in the cutting edge of the blade l2 goug
ing into the tubing 3 and continued elevation
of the tool cuts a slit (shown at 20 in Fig. 5) in
said tubing, thus ripping the tubing from its col 40
lar 11. When the upper end of the collar is
reached in the ripping operation, the point of
the cutting edge of the blade l2 will be projected
outwardly through the tubing and engaged there
by, and continued elevation of the tool will result
in slight rotation of the cutter l2 on its pin ll.
As the cutter rotates, its rear or inner extremity
is brought out of abutting relation with the ?xed
shoulder I6. Being thus left unsupported, the
slide blocks I!) move rearwardly in their slots 9
because of the pressure of the tubing on the cut
ting edge of the blade l2, and, as a consequence,
the entire mechanism, including the cutter I2, is
retracted inwardly and the cutting edge of the
blade I2 is brought out of contact with the tubing 55
2
2,128,593
and gravitates about its pivot pin II to a recess
22 between the two plates 1. As a result, the
cutter is entirely con?ned within the tool after
the cutting operation is completed so that neither
the tubing, the collar, or the tool can thereafter
be damaged by withdrawal of the tool from the
well.
ment of the blade in a prescribed arc about its
pivot to permit the pivotal means to move in
After ripping and withdrawal of the tool, the
ripped section may be removed from the well,
after which an appropriate ?shing toolmay be
engaged with the collar and the balance removed.
Although I have illustrated and described cer
tain of the preferred embodiments of the inven
tion, it will be apparent that various changes and
alterations might be made in the general form
and arrangement of parts described without de
parting from the invention. Hence, it is not in
tended to be limited to the precise details set
forth, and I shall consider myself at liberty. to
make such changes and alterations as fairly "fall
within the spirit and scope of the appended
claims.
wardly of said housing, ?xed means in said hous
ing and engageable with the cutter blade for
maintaining the cutting edge outwardly of said
housing, said last mentioned means being adapted
to be disengaged from said blade following move
.
>
-
What is claimed is:
1. A tool for‘ cutting well casing sections com
prising a housing, a cutter blade pivoted in said
housing and having a cutting edge at its outer
end projecting from the housing, means whereby
the cutter blade may be moved inwardly of said
housing to retracted position in said housing,
30 and means in said housing and engageable with
the cutter blade for maintaining it in its out
ward operative position, said last mentioned
means being adapted to be disengaged from said
blade following movement of the blade about its
pivot in a prescribed arc to permit said cutter
blade to be retracted within the housing.
2. A tool for cutting well casing sections com
prising a housing, a cutter blade having its cut
ting edge projecting from said housing, pivotal
means for supporting said cutter blade, said
pivotal means being slidable inwardly and out
wardly of said housing for retracting the cutter
blade.
3. A tool for cutting well casing sections com~ 10
prising a housing, a cutter blade pivoted in said
housing and having a cutting edge at its outer
end projecting from the housing, means permit
ting the cutter blade to be moved inwardly of
said‘ housing to retracted position in said hous 15
ing, a fixed shoulder in said housing engageable
with the inner end of said cutter blade for main
taining the latter in its outward operative posi
tion, said blade being adapted to be brought out
of abutting relation with said shoulder follow
ing movement 'of’the blade about its pivot in a
prescribed arc whereby said blade is permitted
to be retracted to inoperative position inwardly
of the housing.
4. A tool for cutting well casing sections- com 25
prising a housing, oppositely disposed transverse
slots provided in said housing adapted to receive
slide blocks therein, a pivot pin connecting said
slide blocks and supporting a cutter blade, means
in said housing and engageable with’ the.cutter 30
blade for maintaining said slide blocks in a for
wardly position in their slots so that the cutting
edge of the blade protrudes outwardly of the
housing, said last mentioned means being adapted
to be disengaged from said blade following move 35
ment of the blade about its pivot in a prescribed
arc so that said slide blocks are permitted to
move rearwardly in their slots to retract the
cutter blade to inoperative position.
CHARLES R. PHILLIPS.
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