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Патент USA US2408420

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Oct. 1, 1946.
_
J, ‘L. FOSTER
2,408,419
WELL EXPLOSIVE DEVICE
Original Filed March 17, 1939
Fig-1
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Patented Oct. 1, 1946
.
UNITED STATES. PATENT orncs
2,408,419
v WELL EXPLOSIVE DEVICE
James Lewis Foster, Wichita Falls, Tex.
Original application March 1'7, 1939, Serial No.
262,531. Divided and this application December
2, 1942, Serial No. 467,657
9 Claims.
(Cl. 89-1)
. This application is a division of my prior apearth formation, showing the tool partly in ele
plication on Process of treating wells, Serial No.
vation and partly in section, disposed in a well;
262,531, ?ied March 1'7, 1939,, now Patent No.
Fig. 2 is a fragmentary horizontal section
2,307,729, granted January 5, 1943.
, through the tool, on the line 2-2 of Fig. 1;
This invention relates to an apparatus for g,
Fig. 3 is a longitudinal section through a form
placing an explosive projectile in a subterranean
of a projectile used in connection with the tool;
,
formation, and more particularly to the firing of .
these projectiles from a well into a ?uid-bearing
Fig. 4 is a similar view of a modified form of
projectile used in the tool; and
'
various points in the earth formation and deto-
plosive charges within the tool. '
formation to increase the recovery of said fluid. ‘'
Fig. 5 ha diagrammatic view of a wiring dia
By placing a small amount of the explosive at 10 gram for sequentially ?ring a plurality of ex
nating this explosive, more advantageous results
maybe obtained than by placing a large amount
"of explosive within the bore hole and detonating
it there.
v
I
With more particular reference to the drawing,
the numeral i represents the body of a tool which
carries a plurality of radially disposed explosive
15 chambers or cannons 2 which are preferably
Heretofore, it has been common practice to
lower large charges of high explosives into a well
and to detonate these charges by ~mechanical or
spaced along the length of the tool, preferably
being turned in diilerent radial directions relative
thereto. These cannons have removable barrels
time-clock means. These charges, which con3 which may be taken out of the tool I, being
sist of from ten quarts to five hundred quarts of 20 removably placed in sockets 4 in the tool i. The
pure nitroglycerin, .are dangerous to the workremovable barrels 3 are held in place in recess 1
men handling them, dangerous to the public safeby bolts 6 and within the outer end of this barrel
ty, since they must be moved over the public .
is disposed the threaded bushing 8 which engages
highways, and'often do extensive damage to the
shear ring H and causes the ring to seat upon
well casing and equipment. The reason that 25 gasket 5. This prevents moisture from entering
these charges must be so large is that they dethe powder chamber 9. This threaded bushing
pend entirely on concussion and reverberation to ‘
achieve the desired result of loosening and re-
forms an extension of cannon barrel 3 and is re
moved each time a new projectile is inserted. -
moving that part of the formation immediately.
Before inserting the tool into’ a well, an ex
adjacent the bore hole, wherein they are ap- ‘ 3" plosive charge 9 is placed in each of the cannon
proximately axially disposed at the time of the
detonation.
.
bores or chambers 2 behind an explosive ~projec
tile ID or Iii’ therein, upon which projectile an
While the drawing shows one form of apparaexpansive shear ring II has been ?tted and
tus for practicing the invention, it is to be'underslipped into an annular recess i2v in the cannon
stood
thatadvantageous
the inventionplacing
relatesoftoexplosives
provisionsconfor 35 bore
2.
the more
A percussion
cap I3 is fitted into an opening
tained in projectiles at a point in the earth’s
M in the cannon barrel 3, longitudinally of the
stratum removed from the bore hole, so that the
tool, so that ?ring pin l5 will detonate the cap
portion of the stratum lying between the point
i! and theadjacent explosive charge 9 upon the
of explosion and the bore hole will be driven to- 40 striking of the ?ring pin i5 by the hammer
ward the bore hole by the force of the explosion. ' ii. The hammer I6 is operated by an electro
It is obvious that varied results such as blastmagnetic coil or solenoid i1 when electrical en
ing down a portion of the wall of t e well, driving
ergy is supplied thereto. The entire solenoid
gathering holes with basins at the outer ends
mechanism is contained in a casing i8 and may
thereof, providing entries for formation solvents, *5 be inserted into or removed from thegtool through
providing enlarged sections in the bore hole for
the recess 4 therein.
the anchoring of cement bridges, and other simiA single wire, with grounded return circuit,
iar functio , may be produced by varying the
is shown and a relay switch is connected within
forces of the explosives involved in the invention
this wired circuit 2| and has connection with the
and by varying the types of projectiles used. 50 solenoid which is next to be operated so that the
These variations are to be considered within the
projectiles may be sequentially fired from cannon
scope of the invention herein disclosed.
bores 2 by closing and opening a switch iii in
The accompanying drawing shows a preferred
said circuit (Fig. 5) ,which switch is located at
embodiment of the invention, in which:
‘ thesurface or at the mouth of the well. Upon
Fig. 1 is a fragmentary vertical section of an 55 closing the switch IS, a source of electrical, en
2,408.41 9
ergy, such as a battery 20 is conn'ectedwith
circuit 2| leading to the solenoids H, which are
in parallel with the circuit through secondary
in this manner a passage is formed for some
A switch arm 22 rests on contact plate 23 (Fig.
2) which closes the circuit to the coil l1 and actu
ates the hammer i6 by the force exerted in mag
distance out into the stratum with a basin at
the outer end, and passages radiating from said
basin, thus opening up producing stratum, or
permitting chemicals to be introduced into cer
ments cutting. a channel in the stratum, and
switches.
tain types of formations where they will work
with greater rapidity and e?'ectiveness than if
netic coil l1. As the hammer I6 is moved to strike
?ring pin l5 (Fig. 1), a pointed end 24 of the
introduced into the immediate bore hole of the
hammer, which pointed end 24 is made of ?ber
or other insulating material and which normally 10 well.
Two types of projectiles are shown in Figs. 3
holds the switch arm 22 retracted, is withdrawn
and 4,
type shown in Fig. 3
and permits switch arm 22 to be moved into the
position shown in dotted lines and indicated at
22' (Fig. 2), by a spring 45 acting on the arm
This
22 until said switch'arm is stopped by a stop 15
pin 48.
-
In this position the contact point 25 is still in
contact with plate 23, although having moved
to the opposite side of the axis of the hammer
l6; however on the breaking of the circuit by 20
the manual release of the switch IS, the solenoid
I1 is deenergized, releasing the hammer l6, and
upon the return of the hammer l6 under pressure
of spring 26 hearing thereagainst, the pointed end
24 will push the switch point oil contact plate 25
23 against contact 23', to dotted line position
retains the projectile within the cannon
barrel until the greater part of the explosive
as indicated at 22'.’ (Fig. 2). By this move
charge is burned. In this manner the full e?'ec
ment of the switch arm 22, the ?rst solenoid is
tiveness of the charge is obtained upon the shear
entirely disconnected from the circuit and re
mains deenerglzed until the tool is removed and 30 ing of expansive shear ring II.
The form of
the mechanism reset when a new charge is in
serted. A plugged opening 21 is provided through
the wall of the tool I for the insertion of an
instrument against switch arm 22 for resetting
the same, as shown in Fig. 2.
When the switch arm 22 moves to the dotted
and longitudinal
disposed within the chamber
signed to carry the explosive charge.
line position 22" and engages contact 23' after
?ring the ?rst charge, this closes the circuit 2|
to the next succeeding solenoid I‘! which is then
ready to be ?red by again closing switch l9, as 40
described. This operation is repeated until all
of the charges have been ?red.
A wire 2i is shown schematically in Fig. 1 for
spective solenoids, designated a, b, and c in Fig. 5.
This wire is shown leading onward from solenoid
c, as any number of discharge units may be used.
When the tool is cross-drilled, the holes will be
plugged in the usual manner.
Several types of penetration are desirable, par- '
ticularly for oil wells, two of which are shown.
One type is indicated at A, where an explosive
the explosive is used
to blow the formation toward the well. In this
manner, a formation which has become sealed
with para?in, asphalt, mud or other foreign mate
rial that renders the formation non-productive
of oil, may be removed by placing a projectile a
and detonating it so that this foreign substance
will be loosened, and may be cleaned from the
A new porous surface is thus produced
which has a larger exposed area, thereby giving
the well greater productivity.
>
The tool may be lowered into the well by any
suitable means such as pipe 42 or a cable. If
used on a drill stem, it can be screwed together
gether.
the projectile
the surface.
The tool may be used also to obtain samples
of formation in the proximity of the detonated
projectile, as the force of the explosion of the
projectile III or
Another form of shot which may be placed,
ID’ will ‘force a portion of the.
formation
into a cannon barrel, as indicated at
is that indicated by dotted outline at B. The 70 44, which portion
amount of explosive 9 in chamber 2 is increased
may be removed from the well
so as to drive the projectile a greater distance
into the stratum than shown at A. This pro
jectile may be so constructed as shown in Fig. 4,
vthat it will be blown into bits, each of the frag
foranalysis.
On reloading the device, a new gasket 5 and \
a new shear ring II, as well as a new projectile,
will be required, as the projectile will shear these
75 each time the cannon is detonated.
2,408,419
6
having a surrounding oil-bearing earth forma
The lower end of the tool is preferably tapered
tion, a device suspended within the bore hole, an
to a point to facilitate its insertion into, as well
as its removal from the well after the explosion
explosive projectile carried by said device, means
on said device for ?ring said explosive projectile
of the projectiles when the explosives would have
forced a quantity of the formation into the bore
from within the bore hole laterally at an angle
to the axis thereof into said oil-bearing forma
tion, and means on the projectile for exploding
hole.
7
said projectile in said formation.
Iclaim:
1. In a well having a bore hole projecting into
a surrornding ?uid-bearing earth formation, the
combination of a well casing projecting said
10 having a surrounding ?uid-bearing earth forma
bore to a point spaced above the lower end of the
to a point above the bottom thereof, a device sus
bore, an explosive device suspended within the
bore, an explosive projectile carried by said de
pended within the bore hole, an explosive pro
jectile carried by said device, means on said de
vice for ?ring said explosive projectile into said
surrounding earth‘ formation at a point below
6. In a well, the combination of a bore hole
vice, and means on the explosive device for dis
charging the explosive projectile into said sur
rounding ?uid-bearing earth formation at a point
below the casing to increase the exposed area of
tion, a wel1 casing projecting into the bore hole
the casing, and means on the projectile for ex
ploding said projectile in said formation.
'1. In a well explosivedevice, a body adapted
2. In a well having a bore hole projecting into 20 to be lowered into a well having a surrounding
?uid-bearing earth formation, an explosive pro
a surrounding fluid-bearing earth formation, the
the ?uid-bearing formation.
jectile carried by said body adapted to be pro
jected into a wall of the well, and delay action
detonating means on said projectile whereby the
bore, an explosive device suspended within the
bore, an explosive projectile carried by said de 25 projectile is adapted to penetrate the wall of the
vice, means on the explosive device for discharg
well before exploding.
8. In a well explosive device, a body adapted
ing the explosive projectile into said surrounding
to be suspended within a bore hole having a sur
?uid-bearing earth formation at a point below
rounding ?uid-bearing earth formation, said
the casing, and means for subsequently explod
ing said projectile in said formation to increase 30 body having a barrel therein, an explosive pro
jectile mounted in the barrel, explosive means
the exposed area of the ?uid-bearing formation.
in the barrel behind the projectile for discharging
3. In a well explosive device, a cannon barrel,
said projectile into the wall of the well, and de
an explosive projectile within the barrel having
lay action detonating means on the projectile
an annular groove around the outer periphery
whereby the projectile is adapted to penetrate
thereof, an expansive ring ?tted into said an
nular groove and secured to said cannon barrel
the wall of the well before exploding.
9. In a well explosive device, a body adapted
tending to hold the projectile therein, and delay
to be lowered into a well having a surrounding
action detonating means on said projectile
fluid-bearing earth formation, the body having a
whereby the projectile'is adapted to penetrate
combination of a well casing projecting said
bore to a point spaced above the lower end of the
the wall of a well before exploding.
40 chamber therein, an explosive projectile carried
by the body in the chamber, means for ejecting
4. In a well, the combination of a bore hole
the projectile from the body into a wall of the
having a surrounding fluid-bearing earth for
well‘, and delay-action detonating means on said
mation, a device suspended within the bore hole,
an explosive projectile carried by said device,
projectile whereby the projectile penetrates the
means on said device for firing said explosive pro
wall of the well before exploding and causes a
portion of the earth formation of the wall of the
well to be directed into the chamber of the body.
jectile into said surrounding earth formation,
and means on the projectile for exploding said
projectile in said formation.
5. In a well, the combination of a bore hole
JAMES LEWIS FOSTER.
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