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Патент USA US3064577

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Nov. 20, 1962
M. E. TRUE
PERFORATOR FOR WELL CASING
Filed 091;. 16, 1958
3,064,571
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Patented Nov. 2e, resa
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such that the well may be worked over or recompleted
‘employing the permanent well completion technique
3,064,571
PERFORATOR FOR WELL CASENG
Martin E. True, Houston, Tex., assigner, by mesne as
signrnents, to Jersey Production Research Company,
Tulsa, Ghia., a corporation of Delaware
Filed Üct. 16, 1953, Ser. No. 757,664
9 Claims. (Cl. IGZ-21.3)
The present invention is directed to -a perforator for
which has been adequately described in the patent litera
ture. The present invention is useful and advantageous in
such multiple completions inasmuch as in Working over
or reperforating in an upper Zone, means are provided
-for avoiding the perforation of the tubing extending
through the upper zone; otherwise there is danger of
the tubing string being perforated when the upper zone is
perforating well casing and the like. More particularly, 10 perforated. By providing apparatus for perforating the
the invention is directed to a gun perforator which is
casing where one pipe string is adjacent a zone to be per
useful in perforating a well casing without perforating
an adjacent pipe therein. In its more specific aspects,
the invention is concerned with a perforator provided
forated, the pres-ent invention is quite useful and irn
portant.
The invention will be further illustrated by reference
15 to the drawing in which a preferred embodiment is illus
with positioning means.
trated and in which:
The present invention may be brieñy described as a
FIG. l shows an arrangement of a well with the device
perforator for perforating-casing and the like which
comprises an elongated cylindrical body member adapted
of the present invention positioned for perforating an
to be lowered through a first pipe in the casing to a
upper zone;
position adjacent a second pipe in the casing, the pipes
being arranged eccentrically in the casing. The elon
gated body member is provided with perforating means
and with a positioning arm arranged in an elongated
recess formed in the body member. The positioning
arm has a length sufficient to extend out of the recess 25
FlG. 2 is a cross-sectional view of FIG. 1 with the
tubing gun lowered out of oneof the tubings adjacent
a second tubing showing one position for perforating
the casing;
FIG. 3 is a similar view to FIG. 2 showing a second
position for perforating the casing; and
FIG. 4 is a partial sectional and enlarged view of the
gun perforator of the present invention.
Referring nov»Í to the drawing and first to FIG. l,
means are provided which bear against the arm and the
numeral 11 designates a well bore drilled from the earth’s
body member which is of sufficient strength for urging
.the arm out of the recess and positioning the body mem 30 surface to penetrate a plurality of hydrocarbon produc
tive strata, some of which are in the upper Zone 12 and the
ber against the casing; and frangible releasing means are
other of which may be in the lower zone 13. Arranged
also provided for maintaining the arm in the recess.
in the bore hole 11 is a casing 14 which is cemented in
Perforating means is carried by the body member oppo
place with primary cement 15. A first tubing string 16
site the positioning arm such that on release of said
is arranged in the casing 14 and terminates with its
positioning arm the perforating means is oriented to
_a distance greater than the greatest distance between
the second pipe and inner wall of the casing. Spring
erforate only the casing Without perforating the second
lower end 16a above or in the upper zone 12. A second
tubing string i7 which is parallel to the ñrst tubing
p1pe.
The perforating means employed in the present in
string 16 extends through the upper zone 12 and termi
vention is suitably a bullet gun or shaped charge or a
nates with its lower end 1S above or in the lower zone 13.
plurality of bullet guns or shaped charges. While it is 40 The lower zone 13 is separated from the upper zone 12
.by a packer 19 while the casing-tubing annulus 2i! is
preferred to employ a shaped charge as the perforating
closed by a second packer 2l.
means, other perforating means such as chemical perfo
Lowered through the tubing 16 and into upper zone 12
rating means and mechanical perforating means may be
by means of a conductor cable 2.2 is the gun perforator
used.
The positioning arm has a length such that, when it 45 23 of the present invention Which is provided with a
is extended, the extended length is greater than the
greatest distance between the second pipe and the inner
Wall of the casing. The positioning arm is provided with
positioning arm 2e and perforating means 25, which,
when operated, serves to perforate the casing 14, cement
15, and the upper Zone 12 to form the perforations 26.
Referring now to FIGS. 2 and 3, it will be seen that
a trigger which serves to close a switch in an electric cir
cuit connected to a source of electrical energy for 50 the casing 14 has the tubing 17 arranged therein with
operating the perforating means such as by firing same
when it is a bullet gun or a shaped charge.
The releasable means is suitably a frangible means
the perforator 23 and its positioning arrn 24 positioning
the perforator such that when tired it perforates only
the casing 14 Without perforating tubing 17, the posi
tioning arm 24 having an extended length greater than
which may be an explosively operated shear pin and the
55 the greatest distance between the tubing 17 and the inner
like.
wall of the casing 14. As shown in FIGS. l to 3 of the
The present invention is suitably used in a well which
drawing, the positioning arm 24 in its fully extended posi
has been drilled to penetrate a plurality of hydrocarbon
tion Orients the perforator 23 by slidable contact with
productive zones, sands, horizons, strata, formations,
the tubing 17.
and the like, from which it is desirable to obtain simul
taneously hydrocarbons from several of said zones such 60
It is to be noted that the perforating means 25 are
Thus in such
carried by the body member opposite the positioning
multiple completions, a plurality of pipe or tubing strings
arm 24 such that the casing 14 only will be perforated
Without penetrating the pipe string or tubing string 17.
as from an upper zone and a lower zone.
such as two or more may be eccentrically arranged in a
well casing with one tubing string extending through an
Referring now to FIG. 4, the perforator 23 is pro
upper zone to a lower zone while another tubing string 65 vided with perforating means 25, which are illustrated
in this embodiment as shaped charges but which may
terminates with its lower end in or above the upper zone
be bullet guns and is provided with a positioning arm 24
with the lower zone being separated from the upper Zone
arranged in a recess 24a formed in the perforator 23.
by a suitable packer and the casing-tubing annulus also
The positioning arm 24 is releasably held in place by a
being closed above the upper zone with another packer.
In the present invention either one or all of the several 70 releasable means 27 bearing against the arm 24, which
tubing strings are preferably arranged with their lower
ends above a plurality of hydrocarbon productive strata
suitably is an explosive shear pin in the recess 24a,
which, on being exploded, causes the arm 24 to be ex
3,064,571
3
tended by an urging means such as spring 2S which bears
against a retaining pin 28a with end 29 and against the
arm 24 with end 30.
The shaped charges or perforating means 25 are iired
by an electrical circuit connected to a source of electrical
energy which may lead to the earth’s surface through the
conductor cable 22, the electrical circuit having a safety
switch 3d therein which is operated by an actuating
trigger 32. which comes into operative engagement or
contact with the switch 31 on being pivoted around a
pivot 33 to extend the arm 24. As can be seen in FIG. 4
an electrical current may be sent through lead 34 to the
open safety switch 31 and through lead 3S to ignite the
explosive shear pin 27 where upon the arm 24 is released.
The trigger 32 closes the safety switch 31 sending the
electrical current through lead 35 to blasting cap 37
which ignites the prima cord 38 iiring the perforating
tioning arm with the second .pipe to perforate
without perforating the second pipe.
2. A perforator in accordance with claim
the perforating means ina bullet -gun.
3. A perforator in accordance with claim
the perforating means is a shaped charge.
4, A perforator in accordance with claim
said casing
1 in which
l in which
l in which
the operating means is a `switch in an electrical circuit
connected to a source of electrical energy for ñring said
perforating means and the actuating means is a trigger
for operating said switch.
«
5. A perforator in accordance with claim l in which
the arm is maintained in retracted position by a releasable
means on said body member.
6. A perforator which comprises an elongated body
member adapted to be lowered through a ñrst pipe in a
casing to a position adjacent a second pipe extending
means 25. This provides that the perforating means 25
will be operated or tired only when the arm 24 is in
extended position such as shown in FIGS. 2 and 3 to allow
below said first pipe in said casing, said body member
being free of any connection with said pipes, said pipes
perforating of the casing 14 without perforating ‘the
v'tubing 17.
From the description taken with the drawing, it will
e means carried by said body member, a positioning arm
be clear that the perforating means 23 is free of any
being arranged eccentrically in said casing, perforating
pivotally mounted on said body member having a length
greater than the greatest distance between the second
pipe and the inner wall of the casing, means urging said
connection with the tubings 16 and 17 and is positioned 25 arm from a retracted position into a fully extended posi~. Y
Ysuch that the perforating means will be operated only
tion, said urging means being of sutlicient strength to
position the body member into contact with said casing,
when the periorating means is positioned to fire in a
direction'away from the tubing 17. In order to assure
said arm being maintained on said body member in said
retracted position until said body member is lowered out
that the perforator of the present invention is properly
positioned before tiring, the conductor cable 22 may 30 of said ñrst pipe, said perforating means being carried
by said body member relative to said positioning arm
be manipulated up and down to be sure that the per
such that on extending said positioning arm the perforat
forator 23 is rotated and assumes a position such as shown
in FIGS, 2 and 3.
ing means is oriented on slidable contact with the sec
ond pipe to perforate said casing without perforating
While the frangible releasing means has been shown
as being released by a small explosive charge, it may 35 the second pipe, and means for operating said perforat
be suitably released or ruptured by a force asserted from
I the surface by means of the conductor cable 22; thus
an upward pull on a shear pin releasing means with a
suñ'icient force to rupture same may be sufñcient to re
ing means responsive to extension of said arm from Ysaid
body member when said body member and arm are in
casing contact.
7. A perforator which comprises an elongated cylin
lease the positioning arm 24. Under some circumstances, 40 drical body member adapted to be lowered through a
iirst pipe in a casing to a position adjacent a second pipe
the frangible releasing means may be dispensed with.
extending below said ñrst pipe in said casing, said' body
For example, a perforator of this type omitting the re
member being free of any connection with said pipes,
leasing means may be positioned in a tubing by man
said pipes being arranged eccentrically in said casing,
ually holding the positioning arm in a collapsed position
in the recess and thus inserted in the tubing. The biased 45 perforating means carried by said body member, a posi
tioning arm pivotally mounted on said body member
arm rides against the inner tubing wall until the body
having a length greater than the greatest distance between
member is lowered out of the tubing when the position
the second pipe and the inner wall of the'casing, spring
ing arm projects outwardly orienting the perforator in
means urging said arm from a retracted position into a
the desired direction until it reaches the perfoating depth.
fully extended position, and frangible releasable means
The nature and objects of the present invention having
on said body member for maintaining said arm on said
been completely described and illustrated, what I wish
body member in said retracted position, said spring means
to claim as new and useful and secure by Letters Patent is:
being of suflicient strength to position the body member’.
1. A perforator which comprises an elongated body
into contact with said casing, said perforating means
member adapted to be lowered through a ñrst pipe in
a casing to a position adjacent a second pipe extending
being carried by said body member opposite said posi
below said íirst pipe in said casing, said body member
being free of any connection with said pipes, said pipes
tioning arm such that on extending said positioning arm
the perforating means is oriented on slidable lcontact of
being arranged eccentrically in said casing, perforating
the positioning'arm with the second pipe to perforate
said casing without perforating the second pipe, and
means carried by said body member, a positioning arm
means
for operating said perforating means responsive to
pivotally mounted on said body member having a length
extension of said arm from said body member when said
greater than the greatest distance'between the second
body member and arm are in casing contact.
pipe and the inner wall of the casing, means urging said
8. A perforator which comprises an elongated cylin
arm from a retracted position into a fully extended posi
drical body member adapted to be lowered through a
tion, said urging means being of suñicient strength to
nrst pipe in a casing to a position adjacent a second pipe
position the body member into contact with said casing,
extending below said first pipe in said casing, said body
means for operating said perforating means only when
member being free of any connection with said pipes,
said arm is fully extended, means carried by said posi
said pipes being arranged eccentrically in said casing,
tioning arm for actuating said operating means, said
shaped charge perforating means carried by said body`
arm being maintained on said body member in said re 70 member, a positioning arm pivotally mounted on said
tracted position until said body member is lowered out
body member having a length greater than the greatest
of said iirst pipe, said perforating means being carried
distance between the second pipe and the inner wall of
by said body member relative to said positioning arm
the casing, spring means urging said arm from a retracted
such that on extending said positioning arm the perfo
position’into a fully extended position, said spring means
rating means is oriented on slidable contact of the posi 75 being of sutiìcient strength to position the perforating
3,064,571
5
6
means into contact with said casing, and frangible re
leasable means bearing against said arm for maintaining
said arm on said body member in said retracted position,
fully extended position, .an electrical circuit connected to
a source of electrical energy and to said shaped charge for
tiring said shaped charge, a switch in said circuit, a trigger
on said positioning arm operatively engaging said switch
said perforating means being carried by said body mem
ber opposite said positioning arm such that on extending
said positioning arm the perforating means is oriented on
slidable contact of the positioning arm with the second
only when said positioning arm is fully extended, and
explosive releasable means connected to said body mem
ber and bearing against said arm for maintaining said
pipe to perforate said casing without perforating the
second pipe, and means for operating said perforating
arm on said body member in said retracted position,
said perforating means being carried by said body mem
means responsive to extension of said arm from said 10 ber opposite said positioning arm such that on extending
body member when said body member and arm are in
said positioning arm the perforating means is oriented
on slidable contact of the positioning arm with the sec
casing contact.
ond pipe to perforate said casing without perforating
9. A perforator which comprises an elongated cylin
the second pipe.
drical body member adapted to be lowered through a
first pipe in a casing to a position adjacent a second pipe 15
References Cited in the ñle of this patent
extending below said ñrst pipe in said casing, said body
member being free of any connection with said pipes, said
UNITED STATES PATENTS
pipes being arranged eccentrically in said casing, shaped
charge perforating means carried by said body member, a
positioning arm pivotally mounted on said body member 20
having a length greater than the greatest distance be
tween the second pipe and the inner wall of the casing,
spring means bearing against said arm and said body
member urging said arm from a retracted position into a
.2,616,370
2,644,519
2,785,754
2,796,623
2,917,280
Foster _______________ __ Nov. 4,
Kanady ______________ __ Iuly 7,
True ________________ __ Mar. 19,
Abendroth ___________ __ .Tune 18,
Castel ______________ __ Dec. 15,
1952
1953
2,952,319
Popham ____________ __ Sept. 13, 1960
1957
1957
1959
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