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SEM. 24V, 1946.
Fil-ed July 26, 1945
wm wm
' /9 rfb/mfr _
Patented Sept. 24, 1946
l 2,407,991
Otis J. McCullough, Houston, Tex., assignor to
McCullough Tool Company, Houston, Tex.
Application July 26, 1943, Serial No. 496,140
1 claim. (Cl. 16S-1)
The invention relates to a pipe releasing device
which is particularly adapted for use in a string
of pipe which is stuck or lodged in a well bore at
an inaccessible location and is useful in jarring
loose a threaded connection so as to permit un
screwing of the pipe.
In the drilling of wells by the rotary method a
string of drill pipe is made up of sections threaded
together with couplings and this string of pipe
a string of pipe in a well bore and ready to be
actuated to release,- the pipe.
v «
Figs. 2 and 3 are vertical sectional views which
form a continuation one with the other and illus
trate the internal construction of the tool.
Fig. 4 is a transverse verticalv section taken
through the explosive chamber and the locating
springs of Fig. 3.
Fig. 5 is a broken detail sectional view illustrat
serves to advance the bit by rotating the bit on 10 ing a plug construction which will'determine the
the bottom of the well bore. In some instances
pressure at which the jar is releasedäagainst the
the Ibit may become lodged in a lissure or crevice
or may be otherwise stopped from rotating and
In Fig. l. a string of pipe 2 has been ~illustrated
the operator on the surface may continue to
which may be made up of the pipe sections 3 and
rotate the pipe and twist off the pipe somewhere 15 4 which are threaded together by a coupling‘ä.
in the well bore. In other instances the pipe
As seen in Fig. l the ends of the pipe 3 and 4 do
may become stopped due to caving or coagulation
not usually come in close contact with each other,
of the drilling mud. Under these circumstances
but may provide an open space 6 inside of the
it is desirable to unscrew one or more sections of
coupling 5. In this manner the lower end_‘I of
the drill pipe and remove the same from the well 20 the pipe 4 forms a shoulder in the threaded con-so as to eventually salvage the pipe. While drill
pipe has been mentioned, other types of pipe such
A pipe releasing device constitutes a tool IIJ
as tubing or casing are also utilized in the well
which is suspended by means of a cable I I in the
pipe in the well bore. This cable II serves to
The present invention concerns itself with the 25 manipulate the tool by lowering and raising it in
setting of the tool at the desired threaded cou
the well bore.
pling which is to be released, the application of
The tool I0 has a plurality of springs I2 cir
a torque tending to unscrew the pipe and then
cumferentially arranged thereon as seen in Fig. 4
the creation of a high pressure blast at the
which normally extend outwardly 4beyond the pe
threaded coupling which will tend to jar the 30 riphery of the tool and are arranged tov engage
coupling and in this manner to loosen the threads.
a shoulder such as 'I in a, pipe connection. It
It is therefore one of the objects of the inven
seems obvious that the tool can be lowered
tion to provide a pipe releasing tool which can
through the pipe by means of the cable II until
be located so as to apply a jar at a threaded con
the desired elevation is accomplished. This ele
nection in a well bore.
35 vation is determined »by the amount of pipe which
Another object of the invention is to provide a
the operator believes may be unscrewed when the
device for latching the pipe releasing tool at the
pipe releasing tool of the present invention is
elevation of the threaded coupling to be released.
utilized. The tool is then raised by pulling up on
Still another object of the invention is to pro
` the cable II until the springs I2 snap into a
vide a, pipe releasing tool wherein a primer serves
threaded coupling. This prevents further upward
to set oiï a charge of explosive to provide a source
movement of the tool and the operator is advised
of high pressure to jar the pipe.
that his tool is anchored in a threaded coupling.
Another object of the invention is to provide
This arrangement of structure is seen in Fig. 1.
an electrically ñred pipe releasing device wherein
The springs I2 may be connected to the tool by
the electric contacts are sealed by confining a 46 the screws I3.
resilient material and applying a, pressure thereto.
The tool I0 is made up of a cap I4 which is
Another object of the invention is to control
threaded at I5 into the Ibonnet I6. This bonnet
the pressure at which a pipe releasing device will
I 6 is in turn connected to the nipple I1 which
discharge a, pressure therefrom against the pipe
is threaded at I8 to the housing I9. A foot piece
to be released.
60 or tail pipe 20 may be carried by the lower end
Other and further objects of the invention will
of the housing if desired.
be readily apparent when the following descrip
As seen in Fig. 2 the cable II extends through
tion is considered in connection with the accom
the passage 22 in the cap I4 and into the bon
panying drawing wherein:
net I6. This cable may preferably carry an elec
Fig. 1 is a side elevation of the tool located in 55 tric contact 23 which is anchored in a sealing
46 prevents escape of any substantial amount of
member 24 disposed in the recess 25 in the lower
the pressure from the explosion chamber.
end of such bonnet. Th‘e electrical connection
Fig. 4 shows three of these openings or dis
26 extends through the cable to the contact 23.
charge outlets 45 so that a uniform jar is applied
This Wire 26 is insulated from the bonnet i6 by
the provision of the insulating material 24. The Ul to the circular threads.
Fig. 5 shows a modiiied type of plug 46 in the
main portion of the cable is enclosed in a packing
form of a cylindrical ñgure 41 which may be a
21 which is held in place by the cap I4.
phenolic member which is driven into the posi
A tool of this sort being lowered into a well
tion seen in Figure 5 and can only be dislodged
bore is subjected to tremendous hydrostatic pres
sure and. in` order to prevent'leakag'el into the 10 by theV application of a tremendous force.
In operation the tool willbe lowered through
tool which' might short »circuit the y#wire 26 itis’
Hthe pipe ¿l to approximately the position of the
desirable to set up and maintain inside the tool
coupling which is to be unscrewed. The tool is
a pressure in excess of the pressure expected to
then moved upwardly until the spring ñngers
be encountered in the well bore. To accomplish
catch in the threaded coupling as seen in Fig.
this the plugs 35 of material have been inserted
1. A torque is then preferably applied to the
through the openings 3l in the side of the bon
pipe él in any suitable manner tending to unscrew
net and the set bushings 32 may be screwed into
the threads of the coupling. While this torque
the openings in order to compress the plugs 3€)
is applied the tool will be ñred so as to apply a
and the packing material 24. In this manner
th'e desired pressure may be set up around the 20 sharp jarring action to the coupling which will
tend to loosen the threaded connection so that
wire 26 to prevent any leakage into the tool.
the torque will unscrew the coupling.
Fig. 3 shows the nipple l1 as having the lower
Broadly the invention- contemplates a tool for
end of the bonnet E6 threaded thereinto so that
applying a jarring action to a pipe in a well bore
the contact 23 projects into the primer chamber
34 in the nipple Il. This primer chamber is ar 25 wh'erein the tool can be accurately located at the
positionl where the jarring action is to be ap
ranged to receive an adapter 35 and the primer
36 which is held in position by a spring 3l.
What is claimed is:
This primer may be of any suitable type which
Apparatus for use in well tubing within a
is arranged to be ’ñred when a vflow of current
occurs through the-fconta'ct‘äí-l so as to ignite 30 well bore to facilitate unthreading of sections of
Well tubing at a joint formed by »an internally
the primer. The ñri-ng of this primer discharges
threaded female coupling member surrounding
ñre into the chamber 39 from whence it flows
and threadedly connected to'externally threaded
through the passage 46 into the explosion cham
ends of tubing sections with the tubing section
ber 4l. This passage ¿l0 is of relatively> small
ends spaced from each other, comprising a hous
diameter so as to conduct the fire from the
ing arranged to be lowered into the well tubing
primer into th‘e explosion chamber.
and having an explosion chamber therein, a
The explosion chamber Il! is disposed in the
charge of explosive in said chamber, a plurality
housing i9 and is arranged to contain a charge
of pressure outlet ports in said housing extending
43 of gun powder or other suitable explosive
which will be detonated by the ñre from the pas 40 from said chamber radially outward in a single
substantially horizontal plane to discharge the
sage 49. It seems obvious that the size of this
products of detonation of the explosive in a plu
charge can he varied in accordance with cir
rality of substantially horizontally and radially
cumstances encountered. A lateral outlet 45
directed jets, means on said housing arranged
from the explosion chamber is shown as being
to contact the end of one of th'e tubing sections
closed by the plug or disk 46 which is firmly fitted
for positioning the housing with said outlet ports
therein. When the detonation occurs this plug
and the jets of explosive products directed at
will be blown from the opening 45 against the
circumferentially'spaced portions of the interior
inside of the lcoupling 5 as will be apparent from
surface of said female coupling member between
Fig. 1. This plug 46 may ñt snugly in the open
the spaced ends of the tubing sections, and
ing so that a predetermined pressure will have
means for detonating saidv explosive.
to build up in the explosion chamber before the
plug is dislodged. The small area'of the passage
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