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Патент USA US2138006

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Y Novi-‘9,1938
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J. H, HOWARD
ROTARY GORE-DRILL
Fiï‘ed oet. 14, 1955
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_21,133,006
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Patented Nov. 2.9, 1.938.
¿ 2,138,006
UNITED sTATEs PATENT OFFICE
2,138,006
ROTARY CORE DRILL
.
John H. Howard, Huntingtonv Park, Calif.
Application October 14, 1935, Serial No. 44,884
3 Claims. (CL 255ë'12)
This invention relates to a well tool and relates vention will bel fully understood from the fol
lowing detailed description of a typical preferred
more particularly to a well drill capable of ob
taining a sample or core of the earth formation.
A general object of this invention is to provide
5 a simple, practical> and improved rotary core
taking Well drill.
-
Another object of this invention is to provide
a rotary well drill embodying a core barrel hav
ing a cutting head and adapted to be fed into
10 the earth formation to cut and receive a core of
the formation'and then be withdrawn from the
well to permit the core to be examined Without
removing the outer barrel or drill proper.
Another object of this invention is to provide
15 a Well drill of the character mentioned in which
the core barrel may be fed into the earth forma
tion in advance of the head of the drill and ro
tated with the drill to obtain a core of the Aforma
tion and then removed from the well with the
20 core contained therein without enlarging the
bore it has formed, thus leaving a reduced bore
or rat-hole. The operation of the core barrel‘in
advance of the drill head to form a reduced
.bore and the subsequent removal of the core
25 barrel without enlarging the reduced bore are
important and facilitate the testing of the Well
as a suitable well tester may be run into the rat
hole or reduced bore following the examination
of the core obtained without the necessity of
-30 running a special drill into the well to form a
rat-hole to receive the tester.
Another object of this invention >is to pro
vide a sample taking drill of the character men
tioned in which the core barrel is fed down
35 wardly into the formation in advance of the
outer barrel by hydraulic pressure or iiuid pres
sure.
Another object of this invention is to provide
a well drill of the character mentioned that em
40 bodies a simple positive and eiïective means for
transmitting rotation from the outer barrel to
the ñuid pressure actuated core barrel during
the drilling and core cutting operation.
Another object of this invention is to provide
45 a drill of the character mentioned that includes
means for informing the driller that the core
barrel has reached the lower end of its down
ward stroke and, therefore, has received a core
of sufficient length.
50
A further object of this invention is to pro
vide a core taking well drill of the character
mentioned that embodies a minimum number
of simple sturdy parts and that is inexpensive
of manufacture.
The_various objects and features of my in
form and application of my invention, through
out. which description reference is made to the
accompanying drawing, in which:
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‘
‘
K
5
Fig. 1 is a central longitudinal detailed sec-" ‘
tional view of the drill provided by this invention '
illustrating the core barrel in the operative posi
tion. Figs. 2, 3 and 4 are transverse detailed
sectional views taken as indicated by lines 2_2, 10
3_3 and 4---4, respectively on Fig. 1.
-
The well drill of the present invention in
cludes, generally, an outer barrel I0 having a
cutting head Il on its lower end, a core barrel
I2 adapted to be run into the outer barrel I0, 15
and means I3 for feeding or advancing> the core
barrel I2 into the earth formation to obtain a
core.
f
The outer barrel I0 constitutes the body of the
drill and is a tubular structure adapted to be 20 y
connected with the lower end of a drilling string.
In the particular form of the invention illustrated
in the drawing the outer barrel I0 is sectional
comprising an upper tubular section I4 and a
lower tubular section I5. Means is‘provided at 25'l
the upper end of the upper section I4 for facili
tating the connection of the drill withV the drill
ing string. This means may take the form of a
threaded socket I6 for receiving a threaded pin
on the lower end of the string.
A suitable 30
threaded pin and socket connection I1 is provided
to connect the two sections I4 and I5 of the
barrel I0. A threaded pin I8 is provided on the
lower end of the section I5 to carry the cutting
head II. In accordance with the invention any
suitable form or type of cutting head may be
provided on the barrel I0. In the drawing there
is shown a typical cutting head comprising a
>tubular shoe I9 threaded on the pin I8 and
spaced cutting parts 20 on the shoe. The cutting parts 20 are in the form of lblades projecting
downwardly and outwardly from the lower> end
of the.shoe I9 for making an annular cut in
the earth formation. The blades v2li project in
wardly at the lower end of the shoe I9 and are
operable to make an annular cut of substantial
radial width or extent. During the drilling oper
ation circulation fluid `passes downwardly
through the longitudinal opening 2l of. the bar
rel I IJ to discharge from the cutting head II.
The opening 2l is comparatively large in diam
eter to receive the core barrel I2 and parts’ are
provided on its wall to cooperate with the core
barrel as will be hereinafter described.
'I'he core barrel I2 is an elongate tubular mem-
35
40
45
50
55
2
2,138,006
ber adapted to be dropped or lowered through
the drilling lstring‘lto pass into the outer bar
wardly and inwardly to central upwardly facing
edges. The lower ends of the splines 31 may be
rel IIJ’an'd may be' fed downwardly by the means similarly formed and when the core barrel I2 is
I3 to cut into the formation in advance of the _lowered or run into the outer barrel III the lower
cutting head II and receive a core.
The core
barrel I2 is comparatively long and is adapted to
ñt in the opening 2| of the outer barrel III with
substantial clearance leaving a ñuid passage P.
The longitudinal opening 22 of the barrel I2 is
open at its lower end and is adapted to> receive
the core of the earth formation as the barrel is
rotated and fed downwardly into the earth for
mation. In accordance with the invention a
cutting head 23~is provided on the lower end of ’
15 the core barrel I2. The cutting head 23 is pro
portioned to pass downwardly through the outer
barrel III and to pass between the blades 20 of,
the cutting head II, and is operable to make an
annular cut and leave a core of the earth forma
20 tion for reception by the core barrel I2. The
ì cutting head 23 includes cutting parts 24'in the
form of downwardly projecting blades arranged
in an annular series to make an annular cut when
the barrel I2 is rotated and fed downwardly. A
25 core catcher>25 is provided to retain and sup
port the core in the core barrel I2.
The partic
ular core catcher 25 illustrated in the drawing
is amore or less typical form of core catcher ro
tatably supported in the cutting head 23 and em
30
bodying upwardly and inwardly projecting spring
ñngers 26.
ends of the splines 31 engage the pitched ends '
of the lugs 38 and this cooperation causes the
core barrel I2 to turn to a position where- its
splines 31 are free to pass downwardly between
the splines 36. The splines 31 are thus engaged
with the splines 36 without excessive shock to
the parts. The splines 36 and 31 are formed and
related to centralize the core barrel I2 in the
outer barrel I0 `and to permit the free downward
feeding or movement of the core barrel I2 rela
tive to the outer barrel II). The spaces between 15
the spaced splines 31 constitute continuations of
the passage l?, as illustrated in Fig. 4, when the
core barrel I2 is in the operative position within
the outer barrel I0. The -lugs 38 spaced up
wardly from the splines 36 may assist in guiding '20
and centering the core barrel I2.
The means I3 for advancing or feeding the
core barrel I2 into the earth formation isla fea
ture of the invention as it provides for the ad
vancement of the core barrel I2 relative to the 25
outer barrel I0 during rotation of the drill to
movevthe cutting head 23 downwardly in ad
vance of the cutting head II so that the barrel
I2 receives a .core of the formation in advance
of the cutting head II. The feeding or advanc 30
ing means `I3 is in the nature of an hydraulic
A valve is provided on the upper end of the
core barrel I 2 to prevent the circulation fluid
means or iiuid pressure means and is under the
from washing downwardly through the core bar
the invention the means I3 includes a piston or
plunger on the upper end of the core barrel I2 35
35 rel and to permit the discharge of fluid from the
core barrel as it is displaced by the entering core.
’I‘he vvalve may include a connector or adapter
21 threaded into a socket 28 in` the upper end of
the. core barrel I2 and carrying a transverse or
40 horizontal web 29. The web 29 has a, central
vertical port 38 which is controlled by a down
Vwardly seating valve or ball 3I. An upstanding
rim 32 is provided on the web 23 around the port
30 to wassist in retaining the ball 3| against dis
placement. A member 33 projects upwardly from
the adapter 21 and has a Valve chamber 34 re
ceiving the n'm 32 and confining the movable
ball 3|. Ports 35 connect the chamber 34 with
the passage P to permit the discharge of fluid
v50 from the interior of the core barrel I2 when th
valve or ball 3| is open.
'
'I‘he invention provides a novel releasable drive
for transmitting rotation from the outer barrel
I0 to the core barrel I2.` This drive is such that
55 it is automatically engaged when the core bar
rel I2 is dropped or run into the outer barrel I0.
'I‘he rotation transmitting drive includes a plu
rality of spaced longitudinal splines 36 on the
wall of the openings 2| and a plurality of spaced
60 longitudinal splines 31 on the core barrel I2 for
cooperating with the splines 36. The splines 36
are preferably on the interior of the lower bar
rel section I5. When in engagement the splines
36 and 31 form a positive rotative drive between
65 the outer barrel IIIV and the core barrel I2.
Novel and particularly effective means is pro
vided for guiding or directingthe splines 31 of
the core barrel I2 between the splines 36 when
the core barrel is dropped or run into the outer
70 barrel I II. A plurality of circumferentially spaced
lugs 38 is provided on the wall of the opening
2|. The lugs 38 are spaced above the upper ends
ofthe splines 36 and are in vertical or longi
tudinal alignment with the splines. The upper
75 ends of the lugs 38 are pitched or inclined up
full control of the driller. In accordance with
operating in the opening 2| of the barrel Il).l
'I‘he plunger comprises a sealing element 40 sur
rounding the upper end portion of the member
33 and bearing downwardly against an annular
flange 4I on the member. A head or nut 42 is 40
threaded on the upper end portion of the mem
ber 33 to clamp or retain the sealing element 40
in position. 'I'he sealing element 40 is shaped
and proportioned to effectively seal- outwardly
against the wall of the opening 2| under the ac
tion of downward ñuid pressure.
Means is provided for producing a diiîerential
or drop in pressure at the opposite sides of the
sealing element 40 so that the pressure on the
circulation fluid pumped through the drilling 50
string feeds or forces the core barrel I2 down-.
wardly. The member 33 has la fluid chamber 43
below the flange 4I and spaced ports 44 extend
ing upwardlyfrom the chamber 43 to its upper
end.
Ports 45 in the wall of the member 33 con
nect the chamber 43 with the fluid passage P.
Oriñce members or chokes 46 having small ports
55
or passages 41 are provided in the upper portions
of the ports 44. The chokes 46 operate to ma
terially restrict the flow downwardly through the
ports 44 to provide for a substantial drop in fluid
pressure at the lower side of the sealing element
40 so that the circulation iiuid under pressure
pumped downwardly through the string acts on
the sealing element 40, the nut 42 and the upper
end of the member 33 to force or feed the core
barrel I2 downwardly relative to the outer bar
rel I0. A stem 48 is provided on the upper end
of the member 33 to facilitate the handling of
_ the core barrel I2 by a line provided with an over
shot or other device for engaging the stem. The
upwardly projecting stem 48 is provided with a
tapered head 49 readily engageable by an over
shot or similar ilshing tool.
"il O
In accordance with the invention the drill is 75
2,138,006
constructed to automatically signal to the driller
that the core barrel I2 has recelveda sufficient
amount of core. During the core receiving op
eration the fluid pressure acting on the sealing
3
This contact of course limits downward move
ment of the core barrel I2. When the flange 4I
is in engagement with the lugs 38 the lugs cp
pose the ports 45 to close or restrict the ports.
element 40, the nut 42 and the upper end of the This stops or reduces the downward flow through
member 33 feeds the core barrel I2 downwardly the drilling string and causes the pumps forcing
the fluid through the string to labor. The labor
more rapidly than the outer barrel I0 is ad
vanced, moving the head> 23 downwardly into ing of the pump or pumps indicates to the driller
the earth formation in advance of the head II. that the core barrel I2 has reached the lower
The lower side of the flange 4I is adapted to end of its stroke and has obtained a core of suf 10
cooperate with the upper ends of the lugs 38 to ficient length. When the pump or pumps labor
limit the downward travel of the core barrel I2 the driller discontinues the rotation and down
relative to the outer barrel I0. The parts are ward feed of the drilling string and prepares to
proportioned and related so that the inner sides ` remove the core barrel I2. A cable carrying an
overshot or the like is run into the drilling string 15
15 of the lugs 38 directly oppose and close or sub
stantially close the ports 45_ when the lower side and the overshot or fishing tool is engaged with
of the flange 4I cooperates with the upper sides the stem 48 to remove the core barrel. The line
of the lugs 38.` Thus the downward flow of the or cable is raised to pull the core barrel I2 `up
circulation fluid is stopped or materially retarded wardly out of the outer barrel IIJ and upwardly
20 simultaneously with the stopping of downward through the drilling string. When the core bar
movement of the core barrel I2 relative to the rel I2 is movedv upwardly the core catcher 25
outer barrel I0. The restriction or closing of grips and holds the core to retain it in the core
the ports 45 by the lugs 38 causes the pump or barrel. Thus the core is retained in the core bar
pumps delivering the circulation fluid to the rel I2 and maybe examined when the core barrel
25
has been brought to the surface of the ground.
25 drilling string to labor, indicating to or inform
» The withdrawal of the core barrel I2 as just
ing the drillerv that the core barrel I2 has
reached the lower end of its downward stroke described leaves a reduced bore or rat-hole in
the lower end of the well. If the sample or core
and has received a sufficient core.
In operation the cuter barrel Ill is connected obtained in the core barrel indicates that it is
30 with the lower end of a well drilling string and desirable to make a test of the formation a well 30
run into the well for operation in accordance tester may be run into the well to pass or extend
with the rotary method of well drilling. When into the reduced bore formed by the cutting head
it is desired to obtain a sample or core of the 23 of the core barrel I2. The drill involving the
earth formation to determine its character the core barrel I2 fed into the formation in advance
35 core barrel I2 is dropped or run through the of the principal cutter II and removable from 35
drilling string on a cable to land or come to rest the well without enlarging the reduced bore it
in the outer barrel I0. As the core barrel I2 has formed conditions the well for testing by a
moves downwardly through the outer barrel I0 well tester without further drilling. If the charm
acter of the core obtained is such that it is not
the lower ends of the splines 31 contact or en
40 gage the tapered upper ends of the lugs 38. The deemed advisable to test the formation the drill 40
taper of the lugs 38 causes the core barrel I2 ing may be continued with the drill and cores
to turn to a rotative position where its splines may be taken from time tov time by means of
31 may pass down between the splines 36 on the core barrel I2. The present invention pro
the wall of the opening 2|. Thus the splines 36 vides a rotary well drill involving a core taking
45 and 3’I are engaged to form a positive- rotative means that is positively rotated with the drill 45
drive between the outer barrel III and the core and that is fed into the formation in advance of
the principal cutter by hydraulic pressure to ob
barrel I2. `
_Rotation of the drilling string is then resumed tain a core and to leave a reduced bore or rat
and the circulation ñuid is pumped downwardly hole. The tool is easy to control and operate
50 through the drilling string to pass through the and involves a minimum number of sturdy parts. 50
chokes 46, the ports 44, the chamber 43, the
ports 45 and ñow out through the passage P.
The chokes 4'I provide for a substantial drop in
the pressure on the fluid below the sealing ele
55 ment 48 so that the pressure acting on the seal
ing element, the nut 42 and the upper end of the
member 33 urges or feeds the core barrel I2
downwardly. Thus the core barrel I2 is fed
downwardly relative to the outer barrel I 0 and
60 is rotated with the outer barrel so that its cut
ting head 23 cuts into the earth formation. The
hydraulic pressure acting downwardly on the
core barrel I2 causes the cutting head 23 to drill
into the formation in advance of the cutting head
65 Il. The cutting head 23 fed downwardly in ad
vance of the cutting head II forms -a reduced
bore in the lower end of the well and leaves a
core which is received in the core barrel I2. As
the core is receivedin the core barrel I2 the fluid
trapped in the core barrel is displaced through
the port 30, the chamber 34 and the ports 35.
The drilling or coring operation is continued
until the core barrel l2 is fed downwardly rela
tive to the outer barrel I0 to a point wherev the
75 lower end of- the flange 4I contacts the lugs 38
70
Having described only a typical preferred form`
and application of my invention I do not wish
to be limited or restricted to the specific details
herein set forth, but wish to reserve to myself
any variations or modifications that may appear 55
to those skilled in the art or fall within the scope
of the following claims:
Having described my invention, I claim:
1. A rotary well drill including a tubular body
adapted to be operated on a tubular drilling 60
string, a tubular cutting head on the lower end
of the body, a core barrel adapted to be passed
through the string to the interior of the body,
means for transmitting rotation from the body
to the core barrel, a cutter on the core barrel 65
operable to-cut a core for reception by the core
barrel, means for feeding the core barrel down
wardly to cause its cutter to'cut a core in ad
Vance of the cutting head, and means for audibly
signaling to the driller when the core barrel has 70
been advanced a predetermined extent.
2. In a rotary well drill construction, a barrel
adapted to be operated on the lower end of ~a
tubular drilling string, longitudinal splines on
theinterior of the barrel, a core receiving barrel 76
4
2,138,006
adapted to be passed through the string into the
end of the barrel, a, core barrel adapted to be
barrel, splines on the core receiving barrel adapt
ed to slidably cooperate with the splines on the
passed through the string into the barrel, parts
rel, and a plunger carried by the core barrel for
there being a longitudinal ñuid passage between
on thewbarrel and core barrel adapted to co
barrel, lugs on the barrel for guiding the splines . operate to transmit rotation and allow longitu
of the core barrel between the splines of the _bar
dinal movement of the "core barrel in the barrel,
operating in the barrel, a head on the core barrel » the barrel and core barrel, a plunger on the core
having a port establishing communication be
tween the string and the interior of the barrel
and effecting a drop in pressure below the plung
er whereby the fluid pumped through the string
acts on the >plunger to feed the core barrel
downwardly, one of the lugs substantially clos
ing the port when the core barrel has been fed
_15
a predetermined distance.-
<
3. In a rotary well drill construction, a barrel
adapted to be operated on the lower end of a.
tubular drilling string, a cutter head on the lower
barrel operable in the barrel, there being a port
in the core barrel establishing communication.
between the string and the passage and eiïect
ing a drop in pressure below the plunger whereby
fluid pumped through the string feeds the core
barrel downwardly relative to the barrel, and a
part on the barrel adapted to restrict the ilow
through the port when the core barrel has been 15
fed downwardly a predetermined extent.
JOHN H. HOWARD.
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