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Патент USA US2109903

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March l, 1938.
J. H. HOWARD
Y 2,109,903
VALVE FOR CORE DRÍLLÈ
K
'Filed Jan. 2e. _1957
Aw?
Patented Mu. 1, `was
2,109,903
UNITED "STATES >Plrl'elvr OFFICE
9Claims.
(CL Z55-72)
' This invention relates to weil drilling tools and
relates more particularly to a valve for a core drill
for use in thel rotary method of well drilling.
A general object of this invention is to provide a
simple, practical valve for the upper end of _the
core-receiving barrel of a core drill that prevents
the entrance of thick mud into the barrel whenv
the tool is run into the well, and that prevents
the circulation iiuid from entering the barrel
during the drilling operation.
10
y
` l
core drill valve that automatically closes when
the fluid is circulated through the drilling string
preparatory to the drilling operation and that
remains closed during the drilling operation to
prevent the circulation fluid from washing away
the core, vbut may open to allow the escape of
fluid displaced from the barrel by the entering
core.
-
'
`
Another object of this invention is to provide
K a core drill valve of the character mentioned that 10
It is usually necessary to provide a valve at
is entirely automaticin'operation and that does
the upper end of the core receiving barrel of a
not necessitate the dropping of an object through «
core drill to prevent the downwardly flowing cir
culation fluid from washing away the core and
that will allow the fluid to escape from the barrel
as it is displaced by the core. The typical form
the -drilling string and, therefore, is adapted for
use in tools operated on a drilling string having
of core drill valve now in general use is a simple
a core drill valve of the character mentioned
float valves.
»
15
'
Another object of this invention is to provide
embodying> novel dependable means for holding
its parts properly assembled and tightly secured
t0 the inner barrel.
2
20
O
when the pressure in the barrel exceeds that of , ' A further object <of this invention is to provide’
the circulation fluid. _When a core drill equipped a core drill valve o_f the character mentioned that
with a typical ball type check valve is run into a is'simple, and inexpensive to manufacture, in
ball check valve having 'a ball that seats down
wardly to prevent the entrance 'of the circulation
iiuid to the barrel and` that is adapted to open
well, the valve opens due to the velocity of ñuid
2 Ul iiow into the drilling string and thus allows` the
well iiuid to enter the barrel. If the mud at the.
bottom of the bore is very thick it enters the bar- ,
rel and often clogs the barrel so -that it is im
possible to obtain a core. ‘Valves have been in
stall and service.
'
The various objects and features of my inven
tion will be fully understood from. the following
detailed description of a typical, preferred form
ofthe invention, throughout which description
lreference is made to the accompanying drawing, . .
~
. troduced embodying a ball that is dropped into ' in which:
30
O
,l the drill after the' mud, etc. has been iiushed from
the barrel by waterpumped downwardly through
the drilling string. Thisvdrop-ball type of valve
is satisfactory in many instances but cannot be
employed where ñoat valves are connected in the
3
drilling string, as such float valves prevent the
ball from passing downwardly through the string
to the drill. -
`
-
Another object of this invention is to provide a`
valve for a core drill that closes when the drill
.40 is run into the well and, therefore, prevents mud,
etc. from entering the core barrel.
Another object of this invention is to provide a
valve for a core drill that may allow the light
or clean fluid in the upper portion of the well to
enter the barrel, but which remains closed as the
drill approaches the bottom of .the well, there
by preventing heavy mud in the bottom of the
well from entering and clogging the barrel.
` Another object of this invention is to provide a
core drill valve of the character mentioned that
remains closed during the making up of the joints
in the drilling string as the string is being run
-
'55
into the well.
'
-
l
`
l Another object of this invention is to provide a
Fig. 1 is a longitudinal detailed sectional view
of a typical rotary core drill showing the improved
valve of the present invention on the inner bar- .
rel. Fig. 2 is a longitudinal detailed sectional
view of the valve, taken substantially as indi-- 35
cated by lines 2--2 on Fig. 3 and Figs. 3 and 4 are
transverse detailed sectional views taken as in
dicated by lines 3-3 and li--4 on Fig. 2.
The improved valve provided by this invention
is adapted to be embodied in or applied to core
drills of various types and makes. In the follow
ing detailed disclosure I will describe one typical
form'of the invention as used in connection with
a more or less conventional rotary core drill. It
is to be understood that the invention is not to be
`construed as limited or restricted to the speciñc
application of the invention illustrated in the
drawing.
i
.
'
‘
The core drill illustrated in the drawing `includes an outer barrel l0 `to be connected with
the lower end of a tubular well drilling string.
A sub l I is provided on the upper end of the outer
barrel I0 to facilitate its connection with the
drilling string. A sub l2 is connected with the>
lower end of the outer barrel I0 and» carries a
2
9,109,903
cutter head I3. The cutter head I3 is provided
with cutting means for making an annular cut in
the earth formation. The particular headillus
trated has spaced drag type blades I4 operable to
make an annular cut in the formation and leave
a core for reception by the drill. An inner barrel
I5 is arranged longitudinally in the outer barrel
I0 to receive the core. A collar I6 on the lower
end of the inner barrel I5 -cooperates with a
10 recess in the head I3 to support the inner barrel.
'I‘he inner barrel I5 extends through the outer
barrel Ill with substantial clearance leaving an
Ports
I‘I in the collar I6 connect this fluid space with
15 discharge ports I8 in the head I3. A core catcher
I9 is provided in the head I3 to grip and retain
‘ annular ñuid space in the outer barrel.
the core. The blades I4 cut or leave _the up
standing core which is received in the barrel I5
as -the drilling progresses. The core catcher I9
20 is operable to break loose the core and to retain
the core in the barrel I5 when the drill is re
moved from the well. ‘
rel I5. The cage 22 is a tubular member having
its lower end in communication with thev inner
barrel I5 and having its upper end in communi
cation with the interior of the outer barrel I0
and the drilling string. The tubular cage 22 is'
provided between its ends with a chamber 34 for
containing the ball 24. A downwardly facing
annular shoulder 35 is provided on the lower end
of the cage 22 to seat downwardly against the
upper end of the body 20. A reduced portion 36
is provided on the lower end of the cage 22 and
ñts downwardly into the upper portion of the tu
bular body 20. An annular internal iiange 31 is
provided in the body 20 and is engaged by the
lower- end of the said portion 36. The chamber 15
34 in the cage 22 has closed sidewalls and is -only
Y open at its upper and lower ends.
'
It is a feature of the invention that the device
or valve includes two spaced opposing seats 23
and 38. The seat 38 is provided at the upper end 20
of the chamber 34 while the seat 23 is provided at
the lower end of the chamber, as will be herein
after described. In the 'simple structure illus
The improved valve of the present invention
includes, generally, a body 20, means 2I for re
ltrated the seat 38 is a tapered annular face on an
25 movably securing the body 20 to the upper end internal restriction or flange 39 occurring at the
of the inner barrel I5, a cage 22 on the body 20, '_ upper end of the chamber .34. 'I'he side walls of
a valve seat 23 in the body 20 connected with the the chamber 34 preferably converge upwardly to
cage 22 and a valve or ball 24 in the _cage 22.
the seat 38 to guide the ball 24 to the seat. The
The body 28 may be a simple tubular member opening in the tubular extension or portion 35 is
30 as illustrated in the drawing. In practice the suiiiciently large in diameter to allow the ball 24
body 20 may be comparatively short and may have to cooperatel with the seat 23, as illustrated in
relatively thick walls. The tubular body 2li is Figs. 1 and 2.
'
adapted to enter the upper end of the inner barf
The cage. 22 is preferably provided with a plu
rel I5, as will be more fully described._ The op
rality of circumferentially spaced wings or guide
35 posite ends vof the body 22 may be flat and nor
ribs 40. The ribs 48 project outwardly or radially
mal tov its; longitudinal axis.
.
from the cage 22 and have outer longitudinal
fl‘liea'neans` 2i for securing the body 20 to the edges'adjacent the inner wall of the outer barrel
inner barrel> I5 is such that the valve may be I0 to definitely limit working or tilting of the
` ».fea'sily -`’and quickly connected to and removed inner barrel I5. The ribs 40 operate to centralize
¿from the inner barrel. The means 2| includes a and stabilize the upper portion of the inner bar
` Lcoarse steeply pitched thread 25 on the body 20 rel I5. The upper ends of the guide ribs 48 may
.5.40
r` '. mating’with a similar thread 26 on the barrel I5.
In'theconstruction illustrated the inner barrel I5
‘ - has a tubular extension connected to its upper end
45 by welding at 2'I and this extension carries the
thread 26. _ It is to be understood that the thread
28 may be formed on the barrel I5 and I will con
sider the above-mentioned extension- as a part or
y 5ol
continuation of the inner barrel. The thread 25
is preferably an external thread for cooperating
with an internal thread 26 on the barrel I5.
The threads 25 and 26 are steeply pitched so that
the valve body 20 may be quickly threaded in
I
place.
The body 28 may have a downwardly
55 facing external shoulder 28 for cooperating with
the upper end of the inner barrel I5 to limit down
ward threading of the body.
The means 2l further includes a _latch 29 for
preventing unthreading of the body 20. The latch
60 29 is pivotauy supported by a pm an earned by'
spaced lugs 3| on the upper endvof the body 20.
The latch 29 projects downwardly and is partially
received in a groove 32in the exterior of the body
20. The lower portion of the latch 29 is received
operating with the notch 33 prevents turning and
unthreading of the body 20. The surrounding
and confining outer barrel I0 limits outward piv-'
70 oting of the latch 29. and may prevent therlatch
>from disengaging from the notch 33.
.
'I'he cage 22 houses or contains the valve mem
ber or ball 24 and in the form ofthe invention
illustrated serves to carry the seat 23 and to guide
and stabilize the upper portion of the inner bar-v
30
35
40
be inclined downwardly and outwardly. In prac
tice the ribs..40 may be integral with the cage 22.
One of the ribs 40 is provided atf its lower end
with an extension or lug 4I adapted to cooper-‘ 45
ate with a notch `42 in the upper end of the body
20. 'I'he lug 4I cooperating with the notch 42
prevents relative rotation between the body 2|!
and the cage 22. 'I'he lug 4I is retained in the
notch 42 in the manner to be subsequently de 50
The valve seat 23 is provided in the body 28
and the cage 22 and is engageable by the ball 24
when the ball seats downwardly to prevent the
entrance of circulation ñuid into the core receiv 65
ing barrel I5. The seat 23 may be a simple an
nular member or tubular member, as illustrated.
In accordance with the invention the seat 23 is
threaded' upwardly into the lower portion 36 of
the cage22 to have its upper end adjacent the
lower wall of the chamber 34. An outwardly
projecting annular flange 43 is provided on the
seat 23 to engage upwardly against the body
flange 81. 'I'he flange. 43 is preferably provided
65 in a notch 33 in the upper end of the inner bar- ' on the lower end ofthe seat 23.
rel I5. It will be apparent how the latch 29 co
25
It will be ob
65
served that the iiangr 43 engaging upwardly
against the flange 31 holds .the cage downwardly
against the body 2li and, therefore, holds the
lug"4|'in the-notch 42.
The upper end of the -
valve seat k23 >is provided with a suitably formed 70
sealing face 44 engageable by the ball 24.
'I'he lower end of the seat 23 is provided with
two diametrically opposite notches 45. vThe
notches 45 are adapted to receive a tool for
threading the seat 23 into the cage portion 33 75
aioaeos
when the valve is assembled. When the seat 23
3
course, tends to flow downwardly through the
has been properly threaded in place a bar 66 is cage 22 and the -inner barrel i5. The ñuid thus
arrangedthrough the notches d5 to have its oppo
pumped downwardly through the drill moves the
site ends 'at the internal wall of the body 2d. The ball 2t downwardly against the seat surface td.
ends of the bar dii are welded to the body 2B at The ball 2d engaging the seat surface ‘ld prevents
di?. The vbar' ¿i6 cooperating with the notches . the downward ilowë of circulation iluid into the
d5 ‘and rigidly secured to the body 2d prevents inner barrel it. Thus the' bali 2t prevents the
rotation of the seat 23 relative to the body 2d circulation ñuid from entering the inner barrel
and the seat ilange ¿i3 cooperating with the
10 flange 3l holds the lug ti in the notch dias de
15
20
30
,
to wash away the core as the core is received in ‘
the inner barrel it. When the `upstanding core
scribed above, so that the entire assembly is locked' enters the‘inne'r barrel I5 it tends to displace the' l0
'against disconnection and loosening.
f
fluid upwardly from the inner barrel. When the
The ball 2t may be a plain cylindrical member, pressure on the fluid in the inner barrel becomes
as illustrated in the drawing. The ball 2d is pro
greater than the pressure on the circulation fluid
portioned to properly cooperate with the seat dit the ball 2d raises from the seat surface M and
and the surface il@ of the seat 23. The ball 2t permits'the escape of the trapped iìuid from the 15
is movable through the chamber 3d with substan
inner barrel iii. As described above, the fluid
tial clearance to permit fluid flow through the trapped in the inner barrel i5 is a light, relatively
chamber when it is unseated from the seats t@ _ clean'ñuid and does not interfere with the free
and 23. The ball 2d may be a solid metal mem
entrance of the core to the barrel i5.
20
ber. However, it may be hollow- or formed of a
The core` drill valve provided by the inven
material of relatively low specific gravity to m'ore tion operates to prevent the entrance of thick,
readily rise against the seat 38 with fluid flowing heavy mud into the core receiving barrel when
upwardly through the chamber at.
_
the drill is run into the well. This is important
In operation the core drill is connected with the as it prevents such heavy mud from clogging 25
lower end of a tubular well drilling string and is ` the inner barrel to interfere with the reception of
run into the well on the lower end of the string. the core. The valve is also effective in preventing
The well bore is usually iilled or substantially filled the >downwardly flowing circulation ñuid from
withy the rotary mud ‘employ i. î‘n the rotary entering the inner barrel to Awash "away the core.
method of well drilling. When the drill is run The bod-y 2t of the valve may be easily and quickly 30
downwardly into the well the drilling string is, of threaded onto the inner barrel iä and is de
course, empty and the ñuid in the well ñows up
wardly through _the inner barrel i5 and through
the portsx id and il to pass through the outer
The fluid passing upwardly into the
35 barrel it.
pendably locked in_ place by the latch 29. The
removable cage 22 and the releasable seat 23 are
securely lato-hed or locked to the body 2li by the
lugdi and the bar dt and cannot becomedis~ 35
inner barrel i5 rushes through the cage 22 at a3 placed. The seat 23 and the cage 22 may be
substantial velocity and raises the ball 2d so that readily'replaced when worn. The valve is easy to
it seats upwardly against the seat 3d. The ball install and is dependable in operation.
,
2d engaging upwardly against the seat 38 of
' Having described only a typical preferred form
40 course prevents further ilow through the cage 22
and application of my invention, I do not wish to 40
and thus prevents the further, entrance of ñuicl be limited or restricted to the specific details
into the inner barrel `l 5. It will be apparent that
the fluid received in the inner barrel l5 prior to
closing of the' valve 2t is the fluid _in the upper
45 portion oi’l thel well bore. The fluid standing in
the upper portion of the well bore is light and
carries a minimum of solidmatter in suspension
as such solid matter tends to settle inthe well.
Thus the inner barrel i5 is occupied by clean and
50'
relativelylight fluid or liquid.
.
„
The ball 2d remains closed against the seat
3d as the drill is run through the bore to its
lower'end.` In running a drilling string into a well
it is necessary to connect or make up threaded
55 connections-in the string.I During these opera
tions the drilling string does not move down
wardly. However, the column of fluid standing
herein set forth, but wish yto reserve to myself any
variations or modifications that may appear to
those skilled in the art or fall within the scope ` I
of the following claims: `
45
Having described my invention, I claim:
1. In a well core drill having a core receiving
barrel, the combination of, a cage structure on the l
upper end of the barrel having a chamber, valve
seats at the upper and lower ends of the cham
50
ber, the wall of the chamber being inclined up
wardly and inwardly toward the seat at the upper
end of the chamber, and a movable valve mem
ber in the chamber for cooperating with the
_ seats.
55
'
2. In a well core drill having a core receiving
barrel, the combination of, a body, steep threads
in the well around the outer barrel ld and the ' connecting the body with the barrel, latch means
drilling string is higher than the column Vof fluid preventing unthreading of the body, a cage on
60 in the string so that a differential in pressure
the body, and means controlling fluid ñow 60
exists which maintains ‘the ball 2d upwardly
against the seat 3d. Accordingly, the ball 2d
remains in cooperation with the seat 3E during the
running of the tool into the well.
When the core
65 drill approaches the lower end- of the well bore
occupied by the heavy thick mud this mud is pre
vented from entering the inner barrel l5 by the
relatively light and clean iiuid completely oc
cupying the inner barrel.
70
l
When the drill is in position at the bottom of
the welll the circulation ñuid is pumped down
. wardly through the drilling string to discharge
- from the core drill.
This downwardly ñowing cir
- culation fluid flows through the outer barrel I@
through the cage. ,
,
3. A valve for use on the core receiving barrel
of a well core drill including, a body connected
with the upper end of the barrel, the body having
a notch, a cage seating on the body, a part on 05
the cage cooperating with the notch, means hold
ing the cage against the body, and a valve mem
ber in the cage controlling fluid ñow there
through.
v
-
y
4. A valve for use on the core receiving barrel 70
of a well core drill including, a body connected
with the upper end of the barrel, the body having
a notch, a cage seating on the body, a part on the
cage cooperating with the notch, means holding
to discharge from the ports l'll and I8 and, of , the cage against the body, a seat threaded in the 75
2,109,903
4
cage, e. non-rotatable connection between the
seat and the body, and a. valve member in the
cage for cooperating with the seat.
5. A valve for use on the core receiving borrel
cage where the lug is in the notch, the seat hev
ing o notch, a. bar secured to the body and co
operating'with the notch in the seat to prevent
unthreading of the seat, and a. ball in the cage
of o. weil core drill including, a body connected
for cooperating with the seat.
with the upper end of the barrel. the body having
8. A vai-'1e for use on the core receiving barrel
of a well core drill including, a body connected
a. notch, a. cage on the body leaving o. multiplicity
o1 external ribs, one of solo ribs cooperating with
the notch, a seat threaded to the coge, o non
16 rotatabie connection between the :seat and the
body, end a valve in the cage moei-ating with
the sect.
'
6. A valve for me on the core receiving barrel
of o, well core drill including, n body connected
with the upper end oi the barrel, the body having
a notch, a. cage on the body having o. lug coop
eratlng with the notch, a seat threaded ‘to the
cage end cooperating with the body to hold the
cage where the lug is in the notch, menne gore
venting unthreading of the sent, end o. ball in the
cage for cooperating ‘with the seat.
7. A valve for use on the core receiving leer
rel of a Well core drill including. s. body connected
With the upper end of the barrel, the bodyhaving
a notch, a cage on the body having e lug coop
erating with the notch, e seat threaded to the
cage and cooperating with the body to hold the
,
with the upper end oi’ the borrel, the body having
o. notch, e. cage on the bony having e. lug coop
erating with the notch, o. seat tin‘enoed to tlie
coge and cooperetim;f with the body to hold the
coge where the lug is in the notch, a second seat
in the coge spaced above and opposing the Erst
mentioned seat, a ball in the cage for cooperat
ing with the seats, and means preventing un»
threading of the first mentioned neat.
9. in n well core drill having a core receiving
barrel, the combination of, o. tubular valve coge
bovino an upwardly end inwardlyv inclined side
woll, means removably securing the cage to the 20
said barrel, vnlve seats at the upper and lower
ends oi the coge, one oi' said sects being remov-elaie, and a. ball in the cage operable to cooperate
with the seats, said inclined side well guiding the.
25
bell lto the upper seat.
JOHN E. HOWARD.
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