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Патент USA US2133564

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Oct. 18, 1938.
2,133,564
c. B. PATToN
APPARATUS FOR DRILLINGl WELLS
Filed June 9, 1937
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. Oct. 18, 1938.
c. B. PATToN
2,133,564
APPARATUS FOR DRILLING WELLS
Filed ‘June 9, 1937
‘
2 Sheets-Sheet 2
BYQMM *MM
A TTORNIÈYS.
Patented ocrls, 193s
` '2,133,564
UNITED STATES PATENT ori-‘ICE
2,133,564
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'APPARATUS Foa Damme WELLS
a ‘clement n. Patton, columbus, om»>
Application June 9, 1937,. Serial No. 147,343
"1o claims. (c1. 2st-_4) '_
. My invention relates to'apparatus for drilling
wells. It has to do, more particularly, with ap
paratus for drilling wellsinto the earth for oil,
gas, water, sulfur or other minerals found below
5 the earth’s surface. It relates more specifically>
to the rotary type of well-drilling apparatus. '
With the rotary method of well-drilling now
commonly in use it is necessary to have a driving
u
»
shaft, composed of a plurality of sections coupled
l0 together,~ running from the drilling tool at the
bottom of the hole upwardly through the hole to
.
not benecessary to have a driving shaft extending
from vthe tool to the surface.
Another object_of my invention is to provide
L
the above-indicated device in combination with a
well-drilling tool which is of such a nature that 5
it will undercut the casing to allow lowering
thereof buty which will fold up so that it may be
moved through the casing.
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_
_ .
Another object of my invention is to provide'
well-drilling apparatusy of A_the type Vindicated
which may be quickly and easily lowered into the
casing or raised through the casing’. .
the surface where the driving power unit is lo
Another object of my invention is to provide
cated. Obviously, because it is necessary for the
driving shaft to be so long, it is quite costly. Due well-drilling apparatus of the type indicated
which is of simple structure but which is of very
15 to the extreme length of the driving shaft, con
siderable power will be required for rotating the ' sturdy construction and which will effectively and
_
shaft and the bit _connected to the end thereof. economically drill the well.
Furthermore, because of .the extreme length of
the driving shaft, itfrequires considerable time
1:0 and effort to progressively connect the sections
`thereof together and lower it into the well cas
ing. Also, when the tool is pulled from the casing
it is necessary to provide powerful means for lift
ing .the heavy drive shaft from the casing and
Another object_of my invention isto provide a
well-drilling device of such a type that the casing
is carried within a few feet of the bottom of the 20
boreA so that the side walls of the bore will be pro
tected from movement of the drilling device
thereby diminishing tendency of the side walls to
cave in.
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f
In its preferred form my invention contem 25
coupling the sections of the drive shaft. Also, platesthe provision of a well-drilling unit which
with this method of drilling much power is needed _ is adapted to be disposed within the well casing
A 2li considerable time and effort is required for' un
to operate the expensive equipment necessary to
' force water down through the drill stem and back ’
:m to the surface on the outside of the drill stem to
carry away drillings.
'
at the lower end thereof. This unit embodies an
electric motor and a well-drilling tool located di
rectly adjacent each other. 'I'he well-drilling
tool is rotated by means _of an angular drilling _
Several devices have been proposed in the past . ~stem which slides through the motor and is con
in an attempt to overcome these disadvantages. nected to the dnmng tool. The drilling tool is of
Some of these. devices have embodied an electric -such a nature that at the time it is lowered or
'm motor locat‘èd in the casing directly adjacent the raised through the well casing it will be folded
drilling tool. However, these prior art devicesv up and will not interfere with movement of the ,
well-drilling unit through the casing. However,it reaches the lower end of the casing, the
been successful or practical. Another difficulty when.
tool will automatically unfold and will project
have been of such a structure that they have not4
experienced in the priory art is the provision of a
i“ satisfactory tool which will undercut the casing
to allow lowering thereof but will fold up so that '
it can b'e raised without removing the casing. It
- is desirable to provide a satisfactory grinding type
’_ drilling tool, which is needed in hard structures,
*'- butlsuch a tool is not provided with most prior
'
M,
beneath the casing so that it will undercut the
casing and permit lowering thereof. Folding and _
unfolding of the well-drilling tool is accom
plished automatically merely by raising and low
ering the well-drilling unit.
The preferred embodiment of my invention is
'I'he well-drilling apparatus which I . illustrated in the accompanying drawings where
art’devices.
have provided overcomes all of the Vabovevindi- . in_ similar- characters of' reference designate cor
cated disadvantages and is successful and prac-~ responding parts and wherein:
Figure 1 -is a perspective view showing my well 50
_
_
One of the objects of my invention is to provide drilling unit in operative position.
Figure 2 is a vertical section taken through my
a well-drilling apparatus of the rotary type which
embodies a power unit for rotating the drill and well-drilling unit.
Figure 3 is a horizontal section taken substan-_
which is adapted to be located in the well casing
tical.
55 directly adjacent the drilling tool so that vit will
tially along line 3-3 of Figure 2.
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2
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rotating by means of the cooperating ñattened
portion indicated at 33 in Figure 4. A packing
nut 34 is threaded onto the upper end of the
away, of the well-drilling tool or bit and ther bearing housing 30. An oil duct 35 is provided
for oiling the bearing 33. Sleeve 28 is provided
means for controlling folding and unfolding there
of, the bit being shown unfolded or inoperative with a cup 38 on its lower end for catching oil
that drips from the bearing 32. A wire 36 passes
position.
Figure 6 is a similar view but showing the bit downwardly past member 34 and is connected to
folded up or in inoperative position.
a contact member 3l of the motor.
It will be apparent that both the upper and
10 f Figure '7 is a perspective View illustrating a
lower end of the motor are sealed and, conse
different type of bit.
quently, there will be no danger of water reach
With reference tc the drawings, I have illus
trated my well-drilling apparatus as comprising ing the interior of the motor. When the motor
mainly a power unit I and to tool unit’2 which is operated the shaft I8/ will rotate due to rota
Figure 4 is a horizontal section taken substan
tially along line 4-4 of Figure 2.
Figure 5 is a perspective view, partly broken
is driven by the unit I.
,
,
,
4
tion of the armature Il.
The sleeve 28 will ro
The unit I is'illustrated best in Figure 2. It tate within the bearing 32. The bearing 32, the
comprises an upper casing 3 of tubular form, a - housing 30 and the packing gland nut 34 will
all be stationary.
lower casing 4 of tubular form and an interme
- 'I’he motor should be wired so as to produce a
diate tubular portion 5 which is threaded to the
20 lower end of member 3 and the upper end of-
member 4 and joins such members together.
Thus, the members 3, v4 and 5 form a substan
tially cylindrical housing. This housing has its
upper edge tapered inwardly as at 6 and vhas an
opening 1 formed in the top thereof. The bot
tom of the housing is substantially closed by
low number` of revolutions per minute and it
should be self-starting. It can either be made of
a single segment or a number of segments. The
motor speed should also be variable as the type
of drilling tool being used and the kind of strata
in which the tool is drilling will have different
effects on the motor speed.
The motor shaft I8 is hollow and has an open
ing of square cross-section, as indicated in Fig
ure 4, extending therethrough. A drilling stem or
shaft 39 of square cross-section extends through
the opening in the shaft I8 and projects from
each end thereof. Since the shaft 39 is of square
formed thereon -which are adapted to ñt into
corresponding notches formed on the interior of cross-section and the opening‘in the hollow shaft
a collar I2 which is disposed in cooperative rela- - I8 is of similar cross-section, rotation of the
tionship thereto when the well-drilling device is motor shaft I8 will cause rotation of the shaft :
in operative position within the well casing I3. 39. However, the shaft 39 may be of any other
This collar I 2 is threaded on the lower end of the desired angular cross-section.
The upper end of the shaft 39 is rounded so
well casing as at I4. The interñtting portions
of member 8 and the member I2 serve to prevent that it can rotate in a guide member 40. It
passes through an opening in this member and
bodily rotation of my well-drilling apparatus.
I provide an electric motor indicated generally is connected thereto by means of a nut 4I thread
ed on the upper end of the shaft. The guide
by the numeral I5 which is disposed mainly with
in the member 4 of the housing but part of member 40, as illustrated in Figure 3, has notches
in its outer >end which cooperate with vertically
which extends up into the member 5. This elec
tric motor may be of the usual type. The motor extending guide ribs 42 formed on the interior of 45
the member 3 of the housing. Thus, the guide
comprises field magnets I6, carried by the mem
member 40 serves to center the upper end of the
ber 4, an armature I'I, disposed within the mag
net I6 and carried by a motor shaft I8, and motor shaft 39 but permits vertical movement thereof.
Abuttments 43 are provided at the upper and
brushes I9, carried by the member 5 of the hous
ing. The lower end of member I1 is flared lower ends of the ribs 42 to limit vertical move
ment of the guide member 40. The ribs 42 and
as at 20 and has a wearing surface plate 2l at
the shaft 39 are longer than shown in the draw
tached thereto which can be removed and re
placed. The plate 2| rests on a plate 22 which ings in order to permit sufficient downward move
is provided with a depending annular shoulderI 23 ment of the tool as it drills through the material.
The guide member 40 has a yoke 44 connected 55
that ñts-- into a corresponding annular- groove
formed in the top of member 9. Oil-intake valves thereto to which the lower end of cable 45 is
connected. By means of this cable the entire ap
24 are provided for carrying oil into the cham
ber 25 surrounding portion 2|)k of member I1 for paratus may be raised or lowered in the casing
oiling the contacting surfaces of plates.'2| and and vertical movementof shaft 39 can be con
trolled. The cable 445 also may carry the power Gf)
22. A collar 26 at the top of chamber 25 pre
vents oil from being thrown upwardly into the cable leading to the electric motor. A switch 46
motor. The motor shaft I8 extends downwardly is provided for starting the motor and a switch 41
through the top of member 9. A packing gland is provided for stopping the motor. These
switches are carried by the member 3 and are
21 is provided between the interior of the mem
ber 9 and the exterior of the lower endof the adapted to be operated automatically when the
guide member 40 contacts therewith. The mem
shaft I8.
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The upperendrof the motor shaft I8 extends ber 3 carries’ adjacent its upper end a plurality
of radially extending lugs 48. These lugs 48
into a sleeve or journal 28. The journal ‘or sleeve
28 has its upper end Athreaded to the upper end are pivoted to member 3 and are normally forced
outwardly by means of springs. They serve to
of shaft I8 as a 29. _ The sleeveA 28 is adapted to
center the upper end of the housing within the
rotate within a bearing housing 30. This bear
means of the enlarged upper end 8 of a sub
stantially tubular member 9. This member 9 has
a portion I 0 threaded onto the lower end of the
30 portion 4 of the housing. The lower edge of the
enlarged portion 8 of member 9 hasteeth II
40
45
0
to
65
ing housing 30 -has an enlarged portion 3| `which
is threadedkinto the upper endv of the member
5 4of the housing. A bearing 32 is’slipped into
75 the bearing housing 30.*and is prevented from
well casing. However, when the well-drilling
apparatusv is pulled upwardly through the cas
ing, the guide member 40 will contact withl the
inner ends of the lugs 48 and cause them to fall-
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2,183,564
downwardly and inwardly into the slot 49 'in
member 3 in which they are disposed.
l
3
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ing portions or arms 66 thereof having their
The shaft 39 extends downwardly through the
lower ends rounded as at 69. The extreme lower
end of the members 65 are pivotally connected to .
member 9 and has an enlarged square portion 50
a block orl bit-carryingmember 16 at a point '
on its’lower end. This portion 50 is disposed
adjacent one edge of this member. \ This mem»- 5 -
mainly within a housing 5| which. encloses the
mechanism that controls folding and unfolding
ber 10 is disposed within the arms 68 and is
pivoted thereto as at 1| adjacent the edge of
of the tool oi- bit. The upper end of the enlarged
the block ormember 10 opposite to the edge
portion 56 passes through a square opening in
1.0 the upper end of the housing 5| as at 52. The
upper end of the housing‘5l is bevelled _as at 53
and the extreme lower edge of member 9 is cor
where the members 65 are connected. The
respondingly bevelledat 54. A plurality of re
silient lugs 55 are secured to the upper bevelled
member 10'has a square boss 12 on its upper 'sur-I ~ ln
face adapted to cooperate with a square socketJ
13 (Figure 2) formed in the lower ¿end of the
member 59.
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l
» The member 10 carries oppositely projecting
15 end 53 of housing 5|. When the shaft 391s in “grinders l14 which are rotatably mounted there- :|r,
its uppermost-.position the surfaces ‘53 and 54 on by means of.spindles 15. -These grinders 14
will be in contact with each other and the lugs extend outwardly from` the member 10 through
55 will extend upwardly into ‘the interior of the spaces 61 between ‘the portions 66 of the
member 9. The enlarged portion 50 of shaft
2.0 39 will at this time force projections 56'o`n the
housing 5|.
_
.
In the operation of my apparatus, assume that .2n .
ends of the lugs into sockets 51 formed on'the ' the casing I3 is in positiondn the earth and the
interior of member 9. When the lugs are in
this position they serve to connect the housing 5|
well-drilling apparatus is adapted to be lowered
intothe casing. The drilling tool will be folded
to the member 9.
up so that the grinders 14 thereof will be within
It is desirable for the hous
ing 5| to be connected to member 9 during rais
ing and lowering of theV apparatus through the
well casing.
) a
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Within the housing 5| al compression spring 58
the tool housing as indicated in F‘igure 6. 'I‘he 2,-,
device will be hanging by the cable 45 which
will pull the shaft 39-to its uppermost position.
This causes the member 59, as indicated in
Figure 6, to be in its uppermost position and the
spring 58 to be compressed. At this time the
pin- 64 will lie in the extreme lower end of the
curved portion 6| of slot 60. It will project
through the slots 62 at the upper ends thereof.
The member 10 and the tool bit carried thereby
will have been at this time swung upwardlyn into
is disposed in surrounding relation to the en-`
3.0 larged portion 5|) of shaft 39.- This compression
spring bears against the upper end of the hous
ing 5| andv its lower end bears against a further
enlarged bearing portion-59 formed on the shaft
39. This bearing portion 59 is square and slides
vertically within the interior of the housing 5|
which is of similar cross-section. The member- - vertical position by the members `65. The tool
59 has a transversely extending slot 60_formed housing 5| will be connected to the member 9
therein. This slot has a- vertical portiomand an by means of the lugs 55,’ the projections 56 of
foutwardly -curved portion 6| at its lower“ end. which will be forced into the socket 51 by means
of ¿enlarged portions 50 of shaft 39 which will ¿o
40.- The side walls of the housing 5| which are ad
be disposed upwardly within the member. 9.
jacent to the ends of the slot 60 are provided
with slots 62. Each of these .slots 62 comprises a lThe lugs 48 will be forced inwardly and the
vertical portion having a curved portion' 63 at toôl‘will be folded up. Consequently, the entire
well-drilling apparatus may then be lowered into
its lower- end which is curved in a direction op
the casing.
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°
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45 posite to that of the'curved portion 6|' of slot 60.
'I‘he apparatus is lowered into the casing, the
It will be noted from Figure 6 that the slot 62 is '
slightly out of alignment with the slot 60. In lower end of lwhich is spaced apredetermined .A '
reality the upper end of the slot 62 -is disposed \ distance from the bottom 'of the hole, by means "`
substantially in alignment with the extreme of the cable 45 until it reaches the lower end of
the casing where the collar 6 on the housing 50
lower end of the curved portion 6| in slot 60.
A pin 64 is passedr through the slots 60 and 6'2 inter-fits with the collar |2fon the lower end of
when the portion 59-of the shaft 39, is in its the casing. This will prevent bodily rotation of
.
v
45
uppermost position within the housings 5|. At
this time the lower end -of the curved' portion
the apparatus within the casing. At' this time
downwardk movementof the housing is- stopped.
of the slot 60 will be in alignment with the upper
-ends of slots 62, as indicated in Figure 6. The
Continued feeding of the cable 45 downwardly ¿55
into the casing'will cause1 the shaft 39 to move
pin 64 pivotally carries a pair of downwardly
downwardly through the hollow motorshaft I8..
extending© curved connecting members 65.` The
The guide member 40 will move downwardly’
vupper portions of these members 65 are dis
therewith. The lugs 49 will, consequently, be
posed within the housing 5|,\between the mem
permitted to swing outwardly and center the .60
upper end of the housing within the well casing.“
ber 59'and the wall of the housing, cut-away
_portions 66 being provided in the outer surface
As the shaft 39 moves downwardly through the
of member 59 to permit swinging movement -of _motor, the enlarged portion 5,6 will slide.down-'
member 65 about the pivot pin '64. It will be
wardly th’rough theJ upper end of the tool hous- ~
notedthaïtthe slots 62 are formed in opposite
ing 5|\ 'I'his movement will be aided by spring 65
side walls of the‘housing 5| substantially midway
‘58.
The member 59 will move downwardly and
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between the edges of the, side walls. ‘ The slöts 62 ` as it moves downwardly the, pin 64 which is- dis
are offset relative to the slot 60. However, 'the posed in the curved portion 6|- of slot 60 -will
curved portions 63 of the slots 62 extendover mo‘ve downwardly through the slot 62. 'I'his
70 the slot 60 while thepur‘ved portion 6| of the downwardmovement ofv member 59 will cause 7()
Slot 66 extends over the slots 62. Furthermore,v the‘members 65 to swingl member 10 about the "
it will be noted that the lower end of the housing
pivot A1| towards a horizontal position. When
5| has its other sidewalls cut away as at 61'so
the pin .64 reaches the curved lower ends 63 of
the _slots 62, the bits 14 of the tool will be hori
that the lower end of the housing _is of substan
7.5 tially inverted U-shape, the downwardly extend
zontally disposed.V The curved portions 63 of` 75
4
2,133,564 .
vslots sz serve to 1ook the tool in horizontal posi
tion until the pin 64 is actually pulled upwardly
by means of- shaft 39. It will be _obvious that
upward forces tending to cause the member 10
to swing'about the pivots'1l will ordinarily- mere
ly force the pin 64, by means of member 65, into
the extremity of the curved portion 63 of slots 62.
The curved portion 6I of slot 60 similarly func
tions to lock the tool in vertical position until
projecting rigidly supported` arms 14a.
These
arms are flat on the bottom but the top surface
thereof is inclined to form a knife edge on one
edge thereof. Theknife edges of the two arms
are oppositely disposed. A removable cutting
member 1lb may be applied to the lower surface
of each arm and is provided with a portion which
projects over the cutting edge thereof. 'A trans
versely extending cutting edge 1lb is provided on
10 --the shaft 39 is actually moved downwardly.
the lower surface of member 10a_for cutting away
As indicated, the tool is now in horizontal posi
tion'. However, the member 59 is still spaced from
the member 10 and the housing 5I is still con
nected to member 9 by lugs 55. It is important
15 for the grinding members of the tool to reach
horizontal position before member 5| moves down
away from member 9 in order that there will be
no danger of the t'ool striking the bottom of the
hole before it is swung outwardly completely.'
material at the center of the hole. '
Contiued downward movement of shaft 39 will
cause the member 59 to move closer to the mem
‘ ber 19. This further movement of vmember 59
will cause the pin 64 to occupy a position in the
upper end of the slot 60. When the member 59
contacts with>the member 19, the boss 12 will nt
into the socket 13. 'I'he member 5| will also ~move
away from the member 9, as indicated in Figure
1. Substantially at the instant when the member
59 reaches the member 10, guide member 40 con
30 tacts with switch 45 and permits current to pass
to the motor. 'I'his will rotate the shaft 39 and
It will be apparent from the above description
that I have provided- well-drilling apparatus
which is of the rotary type and which embodies
a'power unit that occupies a position directly 15
adjacent the drilling tool. Consequently, maxi
mum power and maximum eillciency is obtained
with the power unit. Itis not necessary to have'
a long driving shaft extending from the surface
to the bottom of the casing. Furthermore, the
power unit and the drilling tool are connected
to each other by sturdy connections. The con
nections between the power unit and the drilling
tool control folding and, unfolding of the tool.
The tool is automatically moved into inoperative
position to permit movement through the well
casing whenever the device is lifted through- the
casing. Furthermore, merely lowering apparatus
into the bottom of the casing causes the tool to
30
swing into operative position.
Many other advantages will be apparent from
the drill tool connected to the lower end thereof.
the preceding description, the drawings and the
As> the tool drills -the hole, the shaft 39 will
move downwardly to progressively feed the tool
through the material. When the shaft reaches
following claims.
the limit of its downward movement, the member ,
40 will contact switch 41 and interrupt flow of
current tothe motor. Operation of the motor
will stop and a meter, which may be provided at
2o.
,
Having thus described my invention, what I
claim is:
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35
.
l. A well-drilling apparatus of the rotary type
adapted to be positioned at the end of a well cas
ing comprising‘a power unit, a tool unit, said tool
unit embodying a tool member mounted for move
40 the surface, will indicate the drilling has stopped. , ment between an operative position where it drills 40
The well-drilling device may then be withdrawn, and underreams the hole below the well casing
and the drillings may be bailed out. The casing and an inoperative position for permitting move-l
may then be lowered farther into the bore and the ment thereof through the well casing to and from
drilling operation be again performed, Vas before. working position, a drilling stem adapted to be
It will be understood that the’lower part of rotated by the power unit and being connected 45
the bore or hole will contain water. The water to the tool member for rotating it, said drilling
will surround the electric motor and keep it cool.
power unit, said drilling stem being connected to
motor because it is tightly sealed.- The tool hous
-ing, being square,~wi1l serve to agitata the water
in the lower part of the hole and will prevent the
the tool member in such a manner that longi
tudinal movement thereof will cause movement of
A borings from forming a sediment at the bottom
of the hole. l
operation of lowering the apparatus into the well
casing that whenthe apparatusA is lraised from the
casingby means of the cable 45, the tool will
automatically fold up in the manner illustrated
in
Figure
6.
said tool member between operative and inopera
tive positions.
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2. A well-drilling apparatus of the rotary type
ì
, It will -beapparent'from the description of the
55
stem being slidable longitudinally through the
However, no water will` reach the interior of the
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The tool illustrated in Figures 5 and 6 is adapt
adapted to be positionedat the end of a well cas
ing comprising a power unit, a tool unit, said
power unit embodying an electric motor, said tool
unit embodying a tool member mounted'for move
554
>ment between an operative position where it drills «
and underreams the hole below the well casing
and an ` inoperative position where it will not 60
ed to be used when drilling rock or ’other hard' ' interfere with movement thereof through the well
65
substance. It will be noted that the cone-shaped
grinding members v14 are removably mounted on
the inclined spindles 15. The inclination of the
casing to and from working position, a drilling
stem adapted to be rotated bythe electric motor,
spindles 15 is such that the bottom surface of
the grinder 14 will be substantially horizontally
through the electric motor,- said drilling stem be
disposed, as indicated in Figure 2. A rotatable
cutting member or grinder 14’ is disposed on the
70 'bottom of >member 10 in order to remove ma
terial- at the center of the hole below the^tool
.
saidV drilling stem ybeingY slidable longitudinally
ing connected to the tool member in such a man
ner that longitudinal movementl thereof will cause
movement of said tool member between operative
-and inoperative positions.
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3. A well-drilling apparatus of the rotary type 70
adapted to be positioned'at the end of a well cas
unit.
When drilling through soft substance, it is de
ing comprising a power unit, a tool l/unit, said
sirable to have a tool of the type illustrated in _ power unit embodying
y
`
` an electric
motor, said
' Figure 7. This tool embodies 'a pair of oppositely tool unit, embodying a tool member mounted for
f
2,138,564
-movement between an operative position where it
_
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.
_
5
me motor, said arming stem being sndabie umgi
tudiñally through the -electric motor, said drilling
drills and underreams the hole below the well cas
ing and an inoperative position where'it will not v stem being connected to the tool member. in suchl
interfere with movement thereof through the well a manner that longitudinal movement lthereof
casing to and from working position, said electric will cause movement of said'tool member between
operative and inoperative positions,v and means
motor having a> hollow drive shaft with an open
ing extending therethrough of angular cross-sec
extending from the surface through the casing
tion, a drilling stem of a corresponding angular and connected to said apparatus» for raising. and
cross-section extending through said shaft and lowering it through the casing, said means con
10 being slidable longitudinally through said' hollow trolling longitudinal movement of said drilling
o
shaft, said drilling stem being connected to the tool member in such a manner that longitudinal v
15
stem.
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7_. In combination with a’wellcasing, a well-n
drilling apparatus of the rotary, type adapted to
movement ofthe stem will cause movement of
said tool member between operative and inopera
be positioned at the end oi' the well casing and
tive
comprising a power unit and a tool unit, said
positions.
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4. A well-drilling apparatus of the rotary type , power unit comprising a housing having an elec
adapted to be positioned at the end of a well tric motor disposed therewithin, said tool unit
casing comprising a power unit, a tool unit, said embodying a tool member mounted forv movement
15?
power unit embodying an- electric" motor, said „ between an operative position where it drills and
tool unit embodying a tool member mounted for underreams the-hole below the -wellcasing and 20
swinging movement between an operative position an inoperative position where it will not _inter- "
where it projects outwardly and underreams the fe're with movement thereof through/the well cas-v
hole-below thè°well casing' and inoperative posi
tion where it is so disposed that it will not in
25 terfere with movement thereof through the well
casing to and from working- position, said electric
motor having a hollow drive shaft with an open
ing' extending therethrough of `angular cross-sec
ing to and from'working position,»means on the
lower ~end of the casing i'or> engaging said housing`
to prevent rotation thereof relative to said casing, 25
a drilling~ stem adapted to b_e rotated by the elec
tric motor, said drilling stem being slidable longi
tudinally through the electric motor, said drilling
tion, a'drilling stem‘ of a corresponding angular ~ stem being connected to the tool member in such
30
cross-section extending through said shaft and
being slidable longitudinally through said-hollow
sliaft. said drillingl stem being connected to the
a manner that longitudinal movement thereof 30
willÍ cause movement of said tool member be
tween operative and inoperativepositions, means
tool member in such a manner that longitudinal extending from the surface through the casing
movement of the stem will cause swinging move f ,and connected to said apparatus for raising and
ment of the tool member between operative and lowering it through the casing, said Ameans con
inoperative positions, and means operating auto - trolling: longitudinal movement ?oi’ said drillingy
matically in response to longitudinal movement of stem and means operating automatically'in re
said stem for controlling operation of said motor. _sponse to, longitudinal movementof said drilling
stem for controlling said electric motor,
5. In combination with a well casing, a well
drilling apparatus of the rotary type adapted to ^ 8. In combination, aw drilling stem, a drillingrr
be positioned at the end of the well casing and
y comprising a “powerlunit and a. tool unit, said
power-unit comprising a housinghaving'an elec
tool housing connected to the end of said stem,
saidf stem being movable longitudinally relative»
to said'housing, a drilling tool pivoted to said
tric motor Adisposed therewithin", said tool unit' housing for _ìnovement between oplerative position `
where it projects from the hoáusing and inopera
ment between anÍ operative position where it drills tive position where it is ’disposed substantially'
and underreams the hole below the well casing Within the housing. _means for connecting- the
end of the drilling stem to the tool in such a man
. and an inoperative position where it will no't in
45 embodying a tool member mounted -for move
terfere with v_movement'thereoiî througli>the well, u ner that longitudinal movement of the stem» will
50 casing to and fromrworkin'g> position, means on
the lower end lof the casing for engaging said
housing to prevent rotation thereof relativev to
said casing,»a drilling stem adapted to vberotated
‘by .the electric motor, said drilling stem’being
slidable longitudinally through the electric motor,
cause movement of the tool between operative 50
and inoperative positions', said means comprising
members pivotally connected to the drilling stem
by apivot pin passing through a `transversely ex
tending 'vertically disposed slot formed ’in said
stem, said members-having their opposite ends» 55
said drilling stem being 4connected to the tool connected to the tool- member at a point spaced ~
member _in such »a manner that longitudinal from the‘point where the tool member isïplv
‘movement thereof will cause movement. of said ' otally connected to-the housing, the ends of said
tool' member between operative and linoperative -'pivot pin also extending through vertically dis
GO
positions.
j
.
'
'
‘
.
6. In combinationiwith a well casing, a well
drilling apparatus of the rotary type adapted to
posed slots formed in adjacent side'walls of said
housing, said last-named slots being odset rela
tive to said slot 4in .said stem, the lowerl ends of
` be positioned at the end of the well casing and the slots formed in the casing and the lower end
comprising“ a power unit and' a`tool unit,I said v’of the slot formed‘in the ystem having oppositely
power' ùnit comprising a housing having an velec-`p curved portions each 'of which extends over the \,
tric motor disposed therewithin, said tool unit adjacentßlot. '
9. A well-drilling apparatuspf the rotary
embodying a tool mem er mounted for'movement
between an operative osition wherelt drills. and
underreams the hole below the well casing and an
adapted to be positioned at the end of a well cas
ing comprising a power unit, a tool unit, said tool
-inoperative position where it will not interfere
unit embodying a. tool -member mounted for 704
swinging movement between an operative posi
tion where it projects outwardly and drills and .
withymove ent thereof throughthe well-casing
to and fro Working position, means on‘the lower
end of the casing for engaging said housing to f underreams the hole below. the -well casing and an _ `
prevent rotation thereof~ relative to said casing, a ’
drilling stem adapted torbe rotated bythe elec
. inoperative position where it -is so disposed that
_ it ' will not interfere with movement’ thereof
2,133,564
6
through the well casing to and from working- po
sition, a drilling stem adapted to be rotated by
the power unit and being connected to the tool
member for rotating it, said drilling stem being
slidable longitudinally through the power unit,
said drilling stem being connected to the tool
member in such a manner that longitudinal
movement thereof will cause swinging movement
of said tool member between operative ‘and inop
10
erative positions.
_
g
-
10. In combination, a drilling stem, a drilling
tool housing, said stem having its end passing
into said housing and being slidable longitudinal
ly relative to said housng, a block pivoted to the
15 lower end of said housing and having a drilling
tool member mounted thereon, movement o1' said
block about its pivot being adapted to move the
tool member between an inoperative position
where it is disposed substantially within the hous
ing and an operative position where it projects
from the housing, means for connecting the end
of the drilling stem to the block in such a manner
that longitudinal movement of the stem will
cause the block to move about its pivot, said stem
having an angular socket formed in its lower end 10
adapted to receive an angular portion formed on
said block when the tool member is in operative
position so that the tool member may be rotated
by the stem.
`
CLEMENT B. PATTON.
15
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