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Патент USA US2522401

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sept. 12, 195o
Filed Nov. -.15, 194e
F76. 4
FIG. 2,
Hé. /
MM m
Patented Sept. 12, 1950
f UNITED STATES Ä1>A*rlz‘I\J»'r`-_»loFFlCEif ”
E. J. Longyear Company, Minneapolis, Minn.,
a corporation of Delaware
. _
` - Application November 15, 1948,1S'erial No. 60,093>
5 claims. (o1. s55-72)'
¿invention relates to core barrels used with
core drills, particularly of the type »used for ex
ploratory drilling, and more especially toim- provements in core lifters for such core barrels.
In, the art of core drilling the bit, reaming shell, _
core barrel outergand inner tubes, core lifter and
couplings, by which the assembly is attached to
the-drill rods are collectively known as the “core
In the core drilling art it has been common
practice to provide a core barrel with a core barrel
inner tube for ‘receivingthe core as itis produced
ing a strong core formation. As a result, journals
andthe lcore'barrel inner tubes have been brokenv
whenìattempts are 'made to withdraw the corel
barrelA and the core, when using >such mecha
nismo.` Also, the core barrel inner tube is of ‘thin
metal and itis difficult to machine threads into
thev end of it. Hence,fattempts to mount the core
lifter on the core barrel inner tube have necessi
tated la thickening of the inner tube or, _ con--`
versely, acceptance of a weak inner tube struc-_ _
It is an object of the present invention to pro
by the drill. As originally made such barrels had
, vide an improvedA -core barrel wherein the fore
the Ácore barrel inner tubemounted so as to rotate - ' going disadvantages are obviated and more par
with the ¿outer tube, but these were'subject to ob~
jection because the rotating core barrel inner tube .
ticularly to provide an improved core I_ca-rre'ly
wherein the core lifter is-mounted in such a
tended to iamor drag upon thecore as it was pro
manner that during the drilling operation 'itis
carried >by _andassumes a position on the lower
be disintegrated, thus destroyingor limiting the _'
end of lthe core barrel inner tube and according
usefulness of the mechanism- for exploratory .
ly has a non-rotating action during this portion ‘
duced, and `inmany instances caused the core to -
ofv its "operation, but is mounted so as to _transfer v
>Morezlately, it has been Athe practice to mount n ' thejloading‘imposed by breaking and lifting the
the `core barrelinner tube upon journals so that
corejto the bit during the _core breakingand with
theoorebarrel _inner- tube' is free to -receive the ¿25
drawing function.
core Vas it fis.’ produced, without itself rotating.
The-"eiîect is that the core barrel innerr tube, as]v
it drags slightly upon the core, is thereby stopped
from rotating, the ‘outer tube’oi the'assembly in
l I'the-'meantime »being free to rotate aboutfthe core
barrel inner tube as the entire mechanism pro
gressed into the formation being'drilled.
' `
For the purposeof breakingloose the core when
thecorebarrel inner tubeïis filled, it has been
customary to provide what 'is known as a “core
lifter” in the core barrel assembly._ . This is usual
ly in the form" of -a small split ring having> an ex»y y
terior tapered or conical‘surface which bears- up
It is also an object of the inventionL to provide
‘an improved core barrel'wherein the core lifter is
mounted'within a. transfer case slidable upon the
_ core barrel inner tube and movable relative there
to into Vabutment with the bit >for breaking and
,lifting the core.
It >isa further object of the invention to pro
vide an improved core barrel capable of eXtract- `
l ing amuch larger percentage of core than. vhas
been possible Vwithvprei/ious apparatus.
_It is also an object of the inventionwto provid
an .improved core barrel o_f rugged and simple
construction, yet- having >improved,functioning
on'a'corresponding surface of thedrill bit and an ‘
interior surface for gripping the core thereby to ’
»Other and vfurther objects o_f the invention. are
break vthe core when the core barrel _is withdrawn. l40 ' those inherent inv the _apparatus hereinA illustrated,
-most instances the core lifter has been*>
. mounted in a'recess in thebit itself, but such a
method vvof mounting has been subject to disad
vantages because the rotating bit tends to rotate „ "
the core» lifter, andas a; result the core `lifter
Wears ‘the -core and tends to disintegratejit. In
other yinstances, attemptshave been made to`
mount the core lifter upon the core barrel inner
-`tube, 'when the latter is journalled, so as there
describedr and> claimed.
f ,-
The invention is illustrated with reference Vto
the drawings wherein
,Figure 1 is a longitudinal view, partly in sec“
tien, of the core barrel of the present invention.
showing it during the period `of. drilling;
\ Figure 2 is a. fragmentary‘longitudinal sec-
tional view vof the core lifter portion and bit end
by to provide Vnon-rotation of the core lifter as 50 ¿of the .apparatusishown in Figure land showing
thecorebarrelï progresses forward: over the core. -
the .apparatus during the core lifting operation;
The difficulty with such constructions has been
that the core barrel inner tube',` and particularly f
' Figure 3 isa longitudinal sectional view some#A what'enlarge'd' las compared to Figures 1 and 2, '
its-journal mounting, »are not- suiiiciently strong`
’ to prov-ide the tension force vnecessary for break#
showing the transfer case separated from the
"remaining portions of the apparatus;
Figure 4 is a longitudinal sectional view of the
core lifter which operates in conjunction with the'
transfer case of Figure 3, likewise shown sepa
rated from the remaining portions of the appa
the lower end of the core barrel inner tube, has
a male portion 4I of reduced diameter upon which
Figure 5 is a longitudinal sectional view of a
modified form of core lifter for soft cores, which
also may be used in the transfer case of Figure 3,
The lower end of member 40, which is actually
the correspondingly sized female portion 42 of the
transfer case, generally designated 43, is adapted
to slide longitudinally. Referring to Figure 3 it
will be noted that the transfer case 43 has a
uniform outer diameter 45 and anupper cylin
drical portion 44 of uniform diameter. At the
in place of the core lifter of Figure 4;
Referring to the drawings III illustrates the 10 lower end of the transfer case there is an inter
nally tapered conical surface 4B, the two surfaces
earth or rock formation through which the drill
44 and 46 being separated by an internally ex
is being penetrated for producing a core I I of the
tending flange 41. The lower edge 48 of the
formation. The core barrel includes a coupling
transfer case is provided with a plurality of
i2 which is provided at its upper end with stand
notches 49 across which the drilling fluid may
ard threads I3 for receiving the lower coupling
pass so as to allow the drilling fluid to drain when
of the drill rods to which it is attached. The
the drill string is lifted.
coupling I2 is bored to receive an inner member
Referring to Figure 4 there is illustrated a core
8 which is press iitted into the coupling I2 and
lifter generally designated 5U having an internal
additionally pinned at 9 to provide a solid connec
tion. The member 8 is provided with a channel 20 longitudinally iiuted surface 5I and an outer sur
face 52 of tapered conical configuration adapted
at, I5 which terminates at the space I6 so as to
to nt and slide upon the be wedged to smallerl
allow the drilling fluid to travel in the direction
diameter by the internal conical surface 4B of the
of-_arrows I 1 for cooling the bit, and the coupling
I2 and member 8 are side drilled at 1 to provide
transfer case. The core lifter 50 has a split _at 54
so as to permit it to assume a shape of smaller
a relief port extending into the center bore 6.
diameter, as is common practice.
‘ f
The_member 8 is provided witha screwed in tubu
Referring to'Figure I, during-the drilling op
lar Yjournal stud IS which is threaded into the
member 8 and provided at its lower end with a
eration the transfer case 43 which contains the
core lifter 55 moves relatively upwardly as a"unit.i
portion IS of> reduced diameter. Upon the por
tionsy I8 and i9 there is journalled the journal
This movement is due to the, fact that the core
block 20 of the core barrel inner tubeV 21. The
lifter 50 slightly grips upon the core I I and hence`
journal block 2U is held between the bearing wash
as .the outer tube, bit and reaming shell gradually
move downwardly, the core lifter 5i) tends todrag
ers 2i and ‘22 and is retained in place by means
upon the core II and tends to push against the
of the castellated nut 23, the latter being adjusted
andheld by cotter pin 24. rl‘he member 20 is 35 under surface of the flange 41 of the transfer case,
provided with threads at 25A so as to receive the
thereby likewise causing the transfer case to drag
upperl threaded end of the core barrel inner tube
21. As a consequence of this_'construction the
upon the core.
core barrel inner tuben21 and journal block 20
are free to rotate as a unitrelative to the stud
IS-I 9, or stated conversely, the core barrel inner
tube 21 can remain stationary and slide down
upon the' core while the outer> tube 3|, reaming
shell 33 and bit 3'5 rotate as a unit aroundit.
Upon the exterior surface `of the member I2
there are provided threads 3D to which there is
attached the upper end 3I of the outer tube.
The lower end of the outer tubel is threaded at 32
soÍas to receive the upper end ofA the reaming
Since the core barrel inner tube,
although not rotating, still moves axially with the
outer tube, the lower end 4I of the _core’barrel
:inner tube slides in the female portion 42 of the
transfer case until the lower end of the core bar
rel inner tube abuts against the upper surface of
flange 41. Thereupon, the transfer case 43 and
core lifter 5E] are moved downwardly as a unit.
4:vi v4upon the core I I but` neitherrotates and the inner
tube 21 likewise does not rotate. vDuring this
time it will be noted that there is a space at 55
between the lower edge 48 of the transfer case 43
and the inner ledge 58 of the bit 35. Hence, the
shellv 33 which likewise is threaded> at its lower 50 drillingY water yor fluid entering via arrow I1 is
permitted to cross this space,` as illustrated by the
end 34 to receive the bit 35. Consequently, Vas
the coupling I2 is rotated during the -drilling'op
eration, core barrel outer tube, reaming shell 33
and bit 35 are likewise rotated.' The lower sur
face of the bit 35 and the outer surface of the
reaming shell 33 are provided with linset dia
monds, bort, stellite or other hard cutting mate
rial, and consequently as the'unit is rotated, the
bit 35 gradually drills in_to the surface 31 and the
arrow, 59 and crossesithe face ofthe bit.f` „ '
When the core II `has filledgthe core barrel
inner tube 21, the entire >drill string rotationl is
stopped and a lifting force is applied thereto. f
The first action is to lift the bit 35 olf the bottom f
bit forms the core I I. Meanwhile' the core barrel
inner t'ube 21 drags upon'the core II and con
sequently it is held from rotation, this being per
of the- hole, as shown inFigure 2,» and then as
the bit is withdrawn the inner shoulder 58 of the
bit 35 comes into contactwith the lower'surface
48 of the transfer case-which in the meantime
has remained stationary due to its drag upon the
core. As the drill string and bit 35 was lifted,
mitted by the journalling action on the journal
this likewise lifted the core barrel inner tube 21 _
and the transfer case~-43,¿«being retainedvby the
The lower end of the core barrel inner tube 21 is 65 gripping action of -the core lifter V455, hence slidesY provided with a, female shoulder at 38 into which
relative to the lower end of the `core barrel inner
there projects the correspondingly sized male end i tube at the juncti0n4I-4v2. ¿l Asadditional lifting i
33 of the inner tube extension 40. The junction
force is applied on the Vbit the transfer case vis 38-39 is a press fit and the member 40. laccord
lifted upwardly, the core lifter 50 in the meantime
ingly forms the lower end of the core barrel inner 70 being held by its grip upon the core. The ,rela-`
tube`A 21 which can, however, be removed when
tive movement of the transfer case upwardly out- '
worn out. The members ¿iii and 21 may be made
side the core lifter 50 thereby contracts the ,core
integral in accordance with the -presentinven
lifter due to the wedging actionWhen
-of the cooperating
a suflicient‘î
tion, since the two members 46 and 21 act as a
conical surfaces 48 and 52.
75 »lifting force has thus been applied to the core III:`
it is broken off as illustrated at 60 and the entire
core barrel and drill string is then withdrawn and
removed from the hole.
tapered outer surface for engaging the tapered
inner surface of the transfer case.
2. kThe apparatus of claim 1 further character
When the core barrel is used in very soft forma
ized in that the transfer case has an inwardly
tions, such as clay, the core lifter 58 of Figure 4
may be replaced by the core lifter assembly l0 of
Figure 5, wherein the ring "il is flexible and is
split at l2. The outer surface of the ring 'H is
tapered at ‘i3 to correspond to the taper 46 of the
ner tapered surface which is of maximum di
3. The apparatus of claim 1 further character
ized in that the core lifter has spring iingers ex
firmly attached to the ring 'H by rivets 7'5. The
, vided with a reaming shell and terminating in an
extending flange adjacent that portion of its in
10 tending upwardly and inwardly therefrom for
transfer case 43, but the inner surface of 'H
gripping the core.
notched at its upper edge to receive a plurality
Li. In a core barrel having an outer tube pro
of flexible inwardly bent fingers 75 which are
entire assembly 'i0 fits into the transfer case 43 '
annularv drill bit and having a core barrel inner
and operates like the core lifter 50 in that while'
tube of >lesser diameter than the outer tube, jour
drilling is proceeding, it remains stationary and
hugs the core as the latter is produced, mean
while forcing the transfer case relatively up
wardly against the core barrel inner tube as in
Figure l. When the core barrel is withdrawn the g
transfer case is lifted by contact with surface >58 '
of the bit, the core lifter meanwhile hugging the
core. As more lifting force is 'applied the fingers
'l5 dig into the core and break it. If perchance
the lifter of Figure 5 should be in the `core barrel
and the formation should turn out h-ard instead
of soft, no harm results since the fingers are
merely flexed out and inner surface 'Il then grips
nalled at one end in the outer tube land having a
free end, the improvement comprising having the
core barrel inner tube of a length such that a
space is provided between the free end of the core
barrel inner tube and the drill bit, and a cylindri
cal transfer case of approximately the same di
ameter as the core barrel inner tube fitted to the
free end of the inner tube for limited axial slid- `
ing movement thereon and having an axial length
such that it is free to move between the bit and the
adjacent end of the inner tube, said transfer case
being free to rotate with respect to the core barrel
inner tube, said transfer case having ay tapered
conical inner surface and a split core lifter ring
the (hard) core as is the case with the core lifter
50 of Figure li.
30 having a conical external surface ñtted to slide
within and be contacted by the tapered conical
As many apparently widely different embodi
inner surface of the transfer case, said core lifter
ì ments of this invention may be made without de
ring and transfer case being axially slidable as an
parting from the spirit and scope thereof, it is to
assembly on the ycore barrel inner tube from a
be understood that I do not limit myself to the
specific embodiments herein.
35 position spaced from the bit to a position in abut
ment with the bit.
What I claim is:
5. The apparatus of claim 4 further character
l.' In a core barrel having an annular drill bit
ized in that the core barrel inner tube slides
and having an inner tube journalled within the
within a portion of the transfer case and said
drill string, said inner tube terminating in spaced
relation to the bit for receiving the core as it is 40 transfer case has a flange on its inner surface to
serve as a stop for said sliding movement and as
produced, the improvement comprising a slidable
a stop for the sliding movement of the split lifter
tubular transfer case shaped to slide axially upon
ring therein.
that portion of the inner tube which is most ad
jacent the bit and having an axial length such
that it is free to move axially between the bit and
adjacent end of the inner tube, said case being
The following references are of record in the
shaped so as to abut against the bit when moved
file of this patent:
axially toward the bit and abut against a part
of the inner tube when moved ‘axially toward the
inner tube so as thereby to have only a limited
range of axial movement, said case having a tap
Stone ____________ __ July 16, 1929
ered inner surface between the end of the inner
Allen ____________ __ Oct. 18, 1932
tube and the bit, and a split core lifter ring hav
Howard et al _______ __ Jan. 5, 1937
ing .an inner surface for engaging the core :and a
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