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Патент USA US3085647

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April 16, 1963
J. D. BENNETT
308553 7
SIDE WALL CORE TAKING APPARATUS
Filed March 9, 1960
2 Sheets-Sheet 1
55
LKEH
38
FIG.
FIG. 4.
H
m.
ATTORNEYS
April 16, 1963
J. D. BENNETT
3,085,637
SIDE WALL CORE TAKING APPARATUS
Filed March 9, 1960
2 Sheets-Sheet 2
Fl 6. 5.
Fl_6.7.
360°
90°
12°
‘f 38
F I G‘ 6‘
INVENTOR.
JOHN D. BENNETT
BY
ATTORNEYS
3,085,637
tates
Patented Apr. 16, 1963
1
3,085,637
SIDE WALL CORE TAKING APPARATUS
John D. Bennett, Richardson, Tern, assignor to Sun Oil
Company, Philadelphia, Pa., a corporation of New
Jersey
Filed Mar. 9, 1960, Ser. No. 13,876
8 Claims. (Cl. 175-77)
2
of a tube 26 mounted in a ?tting 28 having a pin 30 ex
tending therethrough and mounting torsion springs 32.
Wrapped around the lower end portion of tubular body
10 is a compression spring 34 which is embraced by a
collar 36 for its protection against damage during drill
ing. Seated upon the collar 36 is the lower end portion
of a cylindrical sheath 38 embracing body 10‘. The torsion
springs 32 bias the core takers outwardly and upwardly,
‘This invention relates generally to well drilling appara
but normally they are secured against such movement by
tus, and more particularly to improvements in side wall 10 sheath 38.
coring devices. One of the objects of the present inven
Referring particularly to FIGURE 6, the sheath 38 is
tion is to provide an improved side wall coring device
provided with four openings 40, respectively, for the vfour
which effectively serves as a section of the drill stem and
tiers of pockets 24 formed in the body 10. These open
remains in the drill stem during the drilling operation,
ings 4!} are arranged, as shown, so that they register with
while being controllable from the surface.
15 the pockets 24 and core takers 26 one at a time.
Another object is to provide a coring apparatus for the
Means are provided for indexing or stepping the sheath
sequential taking of cores at diiferent positions. This is
38 about body 10 to register successively with each of the
accomplished by the provision of a sheath embracing
pockets 24. This indexing means comprises a piston
the drill stern and provided with openings through which
means in the form of a tubular member 42 positioned
the core takers may extend ‘for selectively taking sequen
within tubular body 10 and slidable relative thereto.
tial samples, and by the provision of actuating means for
Tubular member 42 is connected to a cylindrical drive
stepping the sheath about the drill stem to thereby effect
ratchet 44, which embraces the outer wall of tube 10‘ and
projection of the core takers through said openings in
is slidable relative thereto, by means of a plurality of
predetermined sequence for taking samples.
cylindrical cam followers 46 projecting through openings
A further object is to provide such a device with con
25 48 in tubular member 42. Openings 48 de?ne cam tracks
trol means actuated by producing drilling mud pressure
for guiding the movement of cam followers 46. Cam
differentials internally of the drill stem by starting and
followers 46 are ?xedly secured to tubular member 42
stopping the drilling mud pumping means. A device of
by screws 50 which are threaded through the cam fol
‘the indicated type is disclosed in the co-pending applica-,
lowers 46 into threaded engagement with tubular mem
tion of John D. Bennett and Preston E. Chaney, Serial 30 ber 42. Cam followers 46 extend through the openings
No. 856,427, ?led December 1, 1959. An advantage of
48 into openings 51 in drive ratchet 44 of substantially
the apparatus in accordance with the present invention
the same outer diameter as the cam followers 46 and are
is that it is a more simple, compact and reliable structure
substantially ?ush with the outer wall of driveratchet 44.
permitting economy in manufacture and facilitating in
Although any number of cam followers 46 and openings
35 48 may be employed, two are used in the illustrated
stallation and repair.
Other objects of the invention will appear more fully
embodiment of the invention and would be preferable.
from the following description read in conjunction with
It will thus be apparent that the tubular member 42,
the accompanying drawings, in which:
_
'FIGURE 1 is a ‘fragmentary external view of a por
the cam followers 46 land the drive ratchet 44 are con
jointly movable ‘as a unitary structure relative to- the
tion of the side wall core taker in accordance with the 40 tubular body 10. A spring 52 is mounted in compression
invention;
between an annular shoulder 53 formed in the inner wall
FIGURE 2 is a fragmentary longitudinal section
of tubular body 10 ‘and a ‘collar '54 contacting the lower
through a side wall coring device in accordance with the
end of tubular member 42. Compression spring 52 thus
invention;
biases the assembly comprising tubular member 42 and
FIGURE 3 is a fragmentary longitudinal section similar 45 sheath 38 upward to a “home” position determined by
to FIGURE 2, showing one of the core takers shortly
contact of the upper end of ‘sheath 38 with a shoulder ‘55
after beginning its entry into the side wall of the well;
formed in the outer wall of tubular body 10 as is best
FIGURE 4 is an external view of the portion of the
illustrated in FIGURE 2.
Y
drill stem section in accordance with the present inven
A pair of sealing rings 56 and 57 of a sealing material,
50
tion;
such as neoprene, are provided for restricting the drilling
FIGURE 5 is a section taken on the plane indicated
mud from entering between the cooperating walls of
at 5—5 in FIGURE 3;
tubular member 42 and tubular body 10 to prevent the
FIGURE 6 is a developed view looking at the sheath
erosion of these walls by the drilling mud. Sealing ring
which embraces the core takers, the openings in the
56 is mounted in a groove 58 adjacent the upper end of
sheath and core takers being shown in non-registering 55 tubular member 42 and sealing ring 56 is mounted in
relation, the condition that obtains when the device is low
a groove 60 at the lower end of tubular member 42. ‘
As is ‘shown in FIGURE 4, cam track openings 43
ered into the well; and
extend helically relative to the drill stem axis and serve
FIGURE 7 is an elevation of a slug adapted to be
dropped into the drill stern for the control of coring 60 to guide the travel of the assembly comprising tubular
member 42 and dnive ratchet 44 helically relative to the
operation.
tubular body 10. Formed at ‘the lowermost end of drive
A preferred embodiment in accordance with the inven
ratchet 44 are downwardly extending teeth 62 which mesh
tion comprises a tubular body 16 which is threadedly
with upwardly extending teeth 64 formed at the upper
connected in the drill stem between a drill stem section
12, which would usually be the drill collar, and a section 65 end of sheath 38. It will ‘be apparent that the downward
helical movement of drive ratchet 44, which may be
14 at joints 16 and 18, respectively. As shown in FIG
termed the power stroke, is limited by the contact of the
URE 5, tubular body 10 is grooved, as at 20, to provide
cam followers 46 with the lowermost end of openings
for longitudinally extending circumferentially equally
spaced formations 22. In each of the ‘formations 22 there
48.
Since the drive ratchet 44 and the sheath 38 are
in engagement by reason of meshing teeth 62 land 64 'dur-,
are formed four longitudinally spaced pockets 24. There 70 ing this power stroke, the sheath 38 will also ‘be actuated
are four tiers of such formations 22 and pockets 24 with
through this downward helical movement.
I,
each pocket 24 accommodating a core taker in the form
In order to permit movement of the drive ratchet 44
8,085,837
4
3
relative to a sheath 38 on the return movement of the
former from the lowermost position thereof to the home
position, a latch means is provided which serves to dis
engage the sheath 42 from the drive ratchet 44. This
latch means comprises a pair of elongated latching mem
bers 66 mounted in openings 68‘ in tubular body 10.
shown in FIGURE 3. In the lower position of the sheath‘
38, two of the openings 78 are in registry with the pair'
of latching members 66 whereby the latter move out
wardly under the action of springs 72 to extend into such
registering openings 78.
The drilling mud is then stopped, or its pumping rate is
considerably reduced. This reduces the differential pres
sures on opposite sides of the slug 88 to permit return of
pins 70. The lower vends of latching member 66 are
the drive ratchet 44 to the home position by the action
biased outwardly by compression springs 72 urging a hol
low pin 74 outwardly from a recess 76 in latching mem 10 of spring 52. As the drive ratchet 44 begins its return
helical movement toward the home position, the sheath
ber 66 into contact with the tubular member 42. Upon
38 will be held in its lower position by the latching mem
movement of tubular member 42 and sheath 38 to the
bers 66 which prevent both upward and rotatative move
lowermost position thereof, each of the lower ends of
ment of the sheath 38 by reason of the snug ?t of the
latching members 66 is moved outwardly under the action
of springs 72 into one of a plurality of slots 78 provided 15 latching members 66 in openings 78. Since the sheath
38 is held in its lower position there will be a minimum
in sheath 38, sixteen of the slots 38 being provided to
of interference between the teeth 62 and 64 tending to
accommodate the sixteen core taking positions of the
prevent the return rotation of the drive ratchet. The
sheath 38. At the ‘same time, the upper ends of latching
batching members 66 are pivoted ion centrally positioned
sheath 38 will adjust for this interference by being forced
provided with tubular member 42. The latching mem 20 downwardly against the bias of spring 34 as a result of
members 66 move inwardly into an annular groove 80
the mutual camming action of the teeth 62 and 64 as the
drive ratchet 44 moves helically upwardly. While the
core taker projecting out of the opening 49 would also
body 10. Latching members 66 also restrict any upward
serve to arrest rotation of the sheath 38, the latching
movement of sheath 38 since such movement would
cause contact by the lower edges of slots 78 with the lower 25 members 66 relieve the core taker of this function where
by the core takers are not subjected to repeated stresses
edges of latching member 66. On the return helical
during the core taking operations.
movement of the assembly comprising tubular member
After the drive ratchet 44 has moved upwardly a dis—
42 ‘and drive ratchet 44 from the lower position thereof
tance so that the teeth 62 and 64 are fully disengaged, the
to the home position, the latching member 66 will restrict
the sheath 38 from such helical movement to disengage 30 lower portion 82 of the groove 88 will contact the upper
ends of latching members 66 and upon continued upward
the same in a manner to be set forth more fully herein
movement of the drive ratchet 44, portion 82 will cam
after in connection with the description of the operation
latching members 66‘ into openings 68 whereby the sheath
of the apparatus.
38 is no longer restricted against upward movement.
Formed on the upper end of tubular member 42 is a
Spring 34 will thus urge sheath 38 upwardly into reen
landing shoulder 86 adapted for supporting a slug 88
gagement with drive ratchet 44. However, since the drive
comprising a spearhead 90 and a restricted longitudinal
ratchet 44 has been rotated relative to the sheath 38,
passage 92. Alternatively, as later described, a'housing
teeth 62 and 64 will reengage at a position wherein sheath
of a ‘bore hole logging apparatus may ‘be seated at shoul~
38 is advanced one tooth spacing with respect to its origi
der 86.
The coring tool is connected in the drill stem and re 40 nal position prior to the power stroke.
bers 66 are constructed to ?t snugly into the slots 78 to
thereby restrict rotation of sheath 38 relative to tubular
mains there during the drilling operation. As the drilling
mud is pumped down through the internal bore in the
drill stem during the drilling operation, the drive ratchet
44 and the sheath 38 are maintained in the home position
by the action of springs 34 and 52. Initially, the sheath
38 is positioned so that none of the openings 40 registers
with a core taker as is indicated in FIGURE 6.
The
sheath 38 holds the core takers in position in the lower
end portions of the pockets 24 against the in?uence of
the torsion springs 32. The drilling position of the
coring device is shown in FIGURE 2.
Assuming, ?rst, that logging is not involved and it is
desired to core the side wall 94 of the well. The drill
stem is raised a distance su?icient to place the lowermost
tier of core takers 26 at the level of the side wall area
to be cored, land the slug 88 is dropped into the stem.
The slug 88 comes to rest upon the shoulder 86. Gen
In order to take a sample, the drill stem is now lowered
a short distance, in consequence of which the core taker
is driven into the side wall 94 of the well, and swings
outwardly and upwardly through a horizontal position
and emerges from the side wall when it is in a position
extending outwardly and upwardly. As soon as the core
taker is free of the side wall, the torsion spring 32 ?ips
the core taker further upwardly into the upper end por
tion of the pocket 24. The sheath 38 is thus simulta
neously freed for rotation through a subsequent power
stroke since the core taker will no longer interfere with
such movement.
The drill stem is then raised to position the second i.e.,
next to the lowermost, tier of core takers at the level of
the second side wall area to be cored. The core taking
procedure outlined above, including reapplication of mud
pressure by renewal of full ?ow, release of pressure, and
downward drill stem movement is repeated, and this time
erally, this would occur during interruption of the mud
a sample is taken by a core taker in the second tier of
circulation. When circulation is resumed, a gradient in
core takers and circumferentially spaced 90° from the
drilling mud pressure is caused by the resistance to the 60 core taker that took the ?rst sample, this second core
flow of mud due to the restricted passage 92 in slug 88.
This pressure gradient in the drill stem drives the tubular
member 42, the drive ratchet 44 and the sheath 38 down
wardly against the bias of springs 34 and 52. As the
cam followers 46 move in the helical cam tracks provided
‘by openings 48, the drive ratchet 44 is advanced about
tubular body 10. Since the teeth 62 and 64 are engaged,
the sheath 38 turns with the drive ratchet 44 to a position
in which one of the core takers in the lowermost tier
thereof registers with the associated openings 40, where
upon the core taker is swung outwardly through the open
ing 40 under the bias of its torsion spring 32. The free
end of the core taker engages the side Wall 94 of the well
and is arrested thereby in a position extending outwardly
taker being now in alignment with an opening 40. The
drill stem is then raised again to position the third, i.e.,
next to the topmost, tier of core takers at the level of the
third side wall area to be cored. The core taking pro
cedure is repeated again, and this time a sample is taken
by a core taker in the third tier of core takers and dia
metrically opposite the core taker that took the ?rst sam
ple. The drill stem is again raised to position the top
most tier of core takers at the level of the fourth side
wall area to be cored. The core taking procedure is re
peated once again, and this time a sample is taken by a
core taker in the fourth tier of core takers and circumfer~
entially spaced 270° from the core taker that took the
and downwardly. This position of the coring device is 75 ?rst sample. Now the whole operation is repeated, start
3,085,637
5
ing with the second core taker in the ?rst tier of core
would not impede the projection of the electrode assem
takers. In all, with the arrangement illustrated, sixteen
bly.
core samples may be thus taken sequentially. It will be
understood that each time the sheath 38 is advanced about
the drill stem, an opening 40‘ is moved out of registry
It will be understood, of course‘, that the present inven
tion is susceptible of‘ various changes and modi?cations
without departing from the general principles of the in
with an underlying pocket 24, whereupon the associated
vention.
For example, the number of core takers em
core taker and the sample just taken thereby are com
ployed and the order in which the core takers operate
pletely encased and protected from returning drilling mud,
may be varied. Accordingly, the invention is not to be
and another opening 40 is moved into registry with one
regarded as limited except as required by the following
of its associated pockets 26, whereupon another core taker 10 claims.
What is claimed is:
is released for taking a sample.
1. A core taking device ‘for drilled wells comprising a
It will be evident from the foregoing that successive
cores are taken in predetermined sequence, so that by
body adapted for connection in a drill stem, a plurality
of core taker tubes pivotally connected to said body,
keeping a record of the levels at which the coring pro
cedure is repeated, each core may be positively identi?ed 15 means biasing said core tubes for vertical swinging move
ment thereof outwardly from said body for taking
with the level at which it was taken.
samples, tubular means enclosing said body for securing
Drilling may be resumed at any time by retrieving the
slug to permit again the free flow of mud. This may be
said core tubes against outward swinging movement, hav
ing an opening therein for registration with each core
accomplished by lowering on a Wire line an overshot to
tube and movable through a path to successively register
engage the spearhead 90 so that upon withdrawal of the
an opening with each core tube for releasing said core
overshot the slug may be removed. If drilling is not to
tube for swinging movement thereof outwardly for tak~
be resumed after taking cores, the slug 88 may, of course,
ing samples, means movably mounted on said body
be recovered on raising the drill stem to recover the
adapted to be movable in response to differential drilling
cores and/or change the bit.
mud pressures within the drill stem for ‘actuating said
In connection with the use of this coring device it may
tubular means through said movement thereof, means in
terconnecting said actuating means ‘and said tubular
means including a ratchet member carried by said actu
application of Fred M. M-ayes and Jack Weir Jones,
ating means and a catch member carried by said tubular
Serial No. 818,066, ?led June 4, 1959, and in the appli
cation of John D. Bennett, Preston E. Chaney, Jack Weir 30 means engageable with said ratchet member, and latching
means mounted on said body for engagement with said
Jones and Fred M. Mayes, Serial No. 818,162, ?led
tubular means for restricting movement thereof from
June 4, 1959. As disclosed in these applications an appa
each of said successive core tube releasing positions, said
ratus comprising a housing and a ?exible electrode assem
actuating means being contractable with said latching
bly is lowered through the drill stem so that the ?exible
be desirable to effect electrical or other logging. Suit
able apparatus for electrical logging is disclosed in the
electrode assembly becomes projected through openings
35 means to actuate the same to free said tubular means for
movement from each of said successive positions.
2. A core taking device for drilled well-s comprising a
tubular body adapted for connection in a drill stern, a plu~
rality of core taker tubes pivotally connected to said body
and then take the place of the slug 88 in restricting the
?ow of mud, serving in the same fashion as the slug 88 40 ‘and continuously biased for vertical swinging movement
in a bit, the apparatus coming to rest with the housing on
a seat. If logging is to be accomplished with the present
apparatus, the housing may come to rest on the seat 86
to e?’ect coring operations.
While other procedures may be used for both logging
and coring, a typical and advantageous procedure might
thereof outwardly from said body for taking samples,
sheath means mounted on the exterior of said tubular body
for rotation with respect to said body securing said core
takers ‘against outward swinging movement, said sheath
well involve the following:
After the completion of a drilling operation in which 45 means being movable and having openings therein adapted
to receive said core takers and arranged to release said
a new length of the bore hole is produced, the drill stem
core takers successively in predetermined order for
may be lifted from the bottom and the logging apparatus
introduced at its upper end and permitted to drop, or
be lowered, so that the ?exible electrode will enter and
pass through an opening of a jet bit and extend down
wardly below the bit, the housing reaching its lowermost
position when it comes to res-t on the seat 86.
At this
time, the ?exible electrode assembly would have its full
length extended through the bit. The drill stem may
then be raised, as described in said copending applica
tions to eifect automatic logging of the desired portion of
the bore hole which would usually be that portion last
drilled.
Assuming that electrical logging of another earlier
drilled portion of the hole had already been accomplished
and the logging result had been analyzed, it might be
swinging movement thereof outwardly for taking samples,
means responsive to differential drilling mud pressures
and reciprocable from ‘a home position through a power
stroke and a return stroke back to said home position to
index said securing means, said indexing means
including a ?rst tubular member mounted for move
ment interiorly of said tubular body in response
to said differential drilling mud pressures, a second tubu
lar member embracing said tubular body and movable
thereon, a cam follower means extending through said
tubular body interconnecting said tubular members for
conjoint movement thereof, said tubular body de?ning a
cam track at the portion thereof through which said cam
follower means extends for guiding said movement of
said indexing means, and ratchet means carried by said
second tubular member, and interlock means carried by
interest as exhibited by the log. For this purpose, then,
said sheath means and engageable with said ratchet means
the drill stem could be repositioned at successive levels
for transmitting movement of said indexing means to said
65
to effect coring, during which operations the sequential
sheath means.
core taking could be controlled by control of drilling mud
3. A device as claimed in claim 2 wherein said cam
pressure, the housing of the logging apparatus then func
track de?nes a helical path relative to said tubular body
tions in the same fashion as the slug 88 to restrict mud
whereby said sheath means is indexed rotatably about
?ow and provide differential pressure to effect stepping 70 said tubular body.
movements of the sheath 38. After completion of these
4. A device as claimed in claim 2 including latching
successive logging and coring operations, the logging
means cooperable with said securing means for restricting
assembly could be removed by an overshot so that, if de
movement thereof from each of said successive positions
sired, drilling could be resumed. It will be noted that
to cause disengagement of said securing means from said
the coring apparatus contains a central passage which
indexing means during a portion of said return movement,
desirable then to take cores at particular levels of special
3,085,637
7
8
said indexing means contacting said latching means during
being movable out of engagement with said element dur
ing movement of said indexing means through said return
a portion of said return movement, said indexing means
contacting said latching means during said return move
ment for actuating the same to free said securing means
stroke, a latching means mounted on said body, said
latching means being movable between a latching posi
tion in which said latching means engages said securing
for movement from each of said successive positions into
reengagement with said indexing means, said indexing
means to hold the same in said core taking positions
means moving relative to said sheath means during said
thereof and a releasing position out of engagement with
said securing means, said indexing ‘means having cam
disengagement thereof.
means mounted thereon and contactable with said latch
5. A device as claimed in claim 4 wherein said latching
means comprises a latch member pivotally mounted in 1O ing means during a portion of said return stroke thereof
for actuating said latching means to said releasing posi
said tubular body and said sheath means has a plurality
tion thereof to free said securing means for movement
from each of said core taking positions into reengagement
with said indexing means, said indexing means moving
to restrict axial movement of said sheath means in the
direction of said return movement and rotation of said 15 relative to said securing means during disengagement
thereof.
sheath means in either direction about said tubular body.
7. A device as claimed in claim 6 wherein said securing
6. A core taking device for drilled wells comprising a
means comprises a sheath member embracing said tubu
tubular body adapted for connection in a drill stem, a
lar body and having a plurality of openings therein, a
plurality of core taker tubes pivotally connected to said
body and continuously biased -for vertical swinging 20 ?rst group of said openings being adapted to receive said
of slots therein, said latch member being biased to ex_
tend into said slots and cooperable with any of said slots
movement thereof outwardly from said body for taking
latching means upon movement thereof into one of said
samples, means mounted on said body adjacent said core
latching positions, a second group of said openings being
arranged to receive said core takers upon movement
takers for securing said core takers against outward
thereof outwardly for taking samples, said latching means
swinging movement and movable to core taking positions
to release said core takers successively in predetermined 25 cooperating with said ?rst openings to restrict axial move
order for swinging thereof outwardly for taking samples,
ment of said sheath member in one direction relative to
said tubular body and rotation of said sheath member
means mounted on said body adapted to be responsive to
relative to said» tubular body.
differential drilling mud pressures and movable from a
8. A device as claimed in claim 6 wherein said indexing
home position through a power stroke to a second posi
tion and from said second position through a return 30 means includes a first tubular member movable within
stroke back to said home position to index said securing
means through said movement thereof, said indexing
means having a driving member movable therewith be
tween said positions thereof, said securing means having
an element arranged for engagement and movement by
said driving member during movement of said indexing
means through said power stroke, said element being se
cured to said securing means for conjoint movement to
transmit the movement of said driving member to said
securing means in response to movement of said index
ing means through a power stroke, said driving member
said tubular body in response to said differential drilling
mud pressures, a second tubular member embracing said
tubular body and movable thereon and means intercon
necting said tubular members, said driving member being
carried by said second tubular member.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,326,405
2,697,585
2,870,989
Spencer ____________ __ Aug. 10, 1943
Chaney et al __________ __ Dec. 21, 1954
Laval ______________ __ Jan. 27, 1959
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