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Oct 1, 1946‘-
-
r. E. HUTCHISON .
'
2,408,558
MUD SCREEN‘
Filed Dec. 13, 1943
3 Sheets-Sheet l
Oct. 1, 1946.
F. E. H'UTCIHIS‘ON '
MUD SCREEN
FiledDec} 1:5, 1943
‘My
2,408,558
'
'
a Sheets-Shed 2
32
%
-
,
QWQMM
361M! E/MJW; '
Oct. 1‘, 1946.
E; E. HUTCHISON
2,408,558
MUD SCREEN
Filed Dép.
15, 1943
3 Sheets-Sheet 3
mm
.
3.mmmm
mm
(OZ/2M Hui/Lust
x. F;
2,408,558
Patented Oct. 1, 1946
UNITEDTSTATES PATENT OFFICE
2,408,558
MUD SCREEN 7
Frank E. Hutchison, Houston, Tex.
Application December 13, 1943, Serial No. 514,182
3 Claims. (01. 210-149)
1
,
2
chored together‘by a suitable number of tubular
cross members 2.
This invention relates to a mud‘screen.
An object of the invention is to provide equip
There is an upper rectangular frame formed of
ment of the character described which has been
the side members 3, 3 which decline forwardly
specially’ designed for removing foreign‘matter
from drilling ?uid, or drilling mud.
5 and which are supported by the front, interme
diate and rear standards 4, 5, 6, as more clearly
Another and more speci?c object of the inven
shown in Figure 1. The side members 3 are pref
tion is to provide equipment of the character de
erably formed of angle iron with their horizontal
soribedvwhereby a large percentage of ?ne sand
?anges turned outwardly as shown in Figure 3.
will be separated fromrthe drilling fluid as well
The stationary frame work above described is
10
as the shale and other coarser particles.
preferably formed of metal.
~
As is well known,ja special type of drilling ?uid
1 There is a screen frame formed of the side
is usedin well drilling. This ?uid is circulated
members ‘I, ‘I which are anchored together by
down ‘through the drill stem and back up to’ the
the upper and lower angle iron cross bars 8 and 9.
ground surface around the stem. It carries away
The horizontal ?anges of the side member 1
the drill cuttings, keeps the drill cool and main 15
extend outwardly from the vertical depending
tains the walls of the well bore. In order to keep
?anges thereof, as shown in Figure 3. "
the drilling fluid, pure and to maintain its speci?c
Between the horizontally extended ?anges of.
gravityand viscosity within the required range it
the side members 3 and ‘I are the resilient blocks
is common practice to pass the ?uid through
screening equipment, commonly known as a mud 20 l I, l l, on each side which are seated in the re
pit for reuse. Screening equipment for this pur
' tainers l2 carried by the side members 3 and
over which are ?tted the inverted hoods l3 car
pose now in common use will remove a large por
‘ ried by the horizontal ?anges of the side mem- ’
screen as the ?uid returns from the 'well into the
bers l.
i
tion of the shale and other coarseparticles but a
The screening frame is thus resiliently sup
relatively small portion of the fine sand. The 25
ported on the main frame.
present invention, however, has been designed for
There is a mud box supported by the framework
the purpose of extracting from the returning
having the side walls I4, I4, the rear wall l5 and
fluid a greater proportion of the ?ne sand than
the bottom [6. The front portion lBa of the bot
will be removed by equipment now commonly
tom inclines forwardly and merges in the front
used.
'
wall H, which declines forwardly, as shown in
Another object of the invention resides in a
Figure 1 and is secured at its lower margin to
novel process employed for removing the sand
the transverse angle iron 18 which is secured to
from the drilling ?uid.
'
With the above and otherobjects in view,’ the
the side members I.
.
invention has particular relation to certain novel 35 This mud box is of substantially the same
width and length as the main frame work and is
features of construction, operation. and arrange
suitably secured thereto. It has side discharge
ment of parts and to a novel method, an exam
chutes l9, l9 controlled by suitable gates 20, 20
ple of which is given in this speci?cation and il
whereby the reclaimed mud may be delivered
lustrated in the accompanying drawings, where
40 from the mud box back to the pit for re-use.
in:
As will be noted from an inspection of the
Figure 1 shows a side elevation of the mud
drawings, the screen frame is mounted over the
screen, partly in section.
. mud box.
.
Figure 2 shows a plan view.
>
Beneath the screen frame, and anchored there
Figure 3 shows a fragmentary sectional view 45 to, there is a screen 2| formed of suitable for
taken on the line 3-3 of Figure 1.
>
Figure 4 shows a fragmentary cross sectional
view of the screen and frame and
aminated material.
The side margins of this screen are clamped be
tween the upper and lower clamp plates 22 and 23.
v Figure‘ 5 shows an enlarged, fragmentary, lon
There are the side tension‘ bars 24, 24 extend
50 ing from end to end of the screen frame and sub
gitudinal sectional view.
stantially U-shaped in cross section. The upper
Referring now more particularly to the draw
flanges of these bars rest against the inside of the
ings, wherein like numerals of reference designate
corresponding side members ‘I and retaining
the same parts in each of the ?gures, the numer
plates 25 are welded to the top of the side mem
als I, I designate spaced side members forming
bers ‘l and overlie the tension bars 24 to retain
the base of the main frame work which are» an
2,408,558
3
4
the latter in place, as shown in Figures 2 and 3.
The outer margins of the clamp plates 22, 23, are
in Figure 5 and will be retained suspended from
the screen by adhesion thereto and will gradually
retracted and engaged over the lower ?ange of
each tension bar 24, as shown in Figure 4.
There are the tension bolts 216 ?tted outwardly
through holes in the webs of the bars 24 and
Whose inner ends have the heads 2'! which engage
As above stated, these drops will meet with no
obstructions to cause them to drop back into the
mud box. They will assume a sack-like shape
which shape will be preserved by the surface
move on down along the underside of the screen.
tension of the liquid forming the drops and the
fine sand will collect in them and be carried
with said webs. These bolts also fit through holes
in the depending ?anges of the side members 1
and have tension nuts 253 threaded on to the outer
ends thereof whereby said bolts may be placed
along with them. Of course some of the drops
will be released from the screen before they
reach the lower margin of the screen out beyond
the forwardly declining front wall H, but a high
percentage of the drops containing the ?ne sand
will adhere to the smooth underside of the screen
under tension to pull the tension bars 211 out- I
wardly to regulate the tension on the screen 2L1‘
The screen frame has a central longitudinal
T-iron 29 extending from the upper to the lower
end thereof and suitably secured to the upper and
lower ends of the screen frame. Its lower mar
gin has a V-groove to receive a rod 3:3 which ex
tends from end to end thereof and which is
formed of resilient material. The screen 2| pass- es beneath the rod 3?) and when under tension is
until they have passed out beyond the forwardly
declining front wall, or de?ector l1 and then they
will be released from the screen and will fall out
side of the mud box.
As herein before stated, the screen 2| is slight
ly convexon its underside and is drawn tightly
around the cushioning rod 38. The screen is
drawn tightly thereagainst. _ The screen is
stretched uniformly so as to give a smooth, uni
slightly curved downwardly from side to side as
form under surface area.
shown in Figure 3.
As the drilling ?uid flows through the screen,
It will thus be observed that the screen 2| de 25
small drops of the fluid will form over the entire
clines forwardly from end to end of the screen
underside of the screen. This action takes place
frame and over the mud box and is completely
about halfway up the screen, but the exact loca
unobstructed on its underside so that the drops of
tion depends upon the volume of drilling ?uid
liquid forming on the underside. of the screen may
being handled at the time. If the volume is
move downwardly along the underside of the
large, the action starts further down the screen
screen without meeting with any obstructions.
giving less ?otation separation, and when the
Mounted on the main frame, at the rear end.
volume is decreased, the action starts closer to
is a receiving chute 3| which receives the mud
the top of the screen giving more sand separation
returning from the well, through the return pipe
by ?otation.
,
32, and which delivers said mud onto the screen
As the drops move down along the underside
as illustrated in Figure 1.
of the screen, they willcollect more and more
Mounted on the side members ‘i and the cen
tral member 29 of the screen frame are the trans
versely alined clamps 33 which are ?rmly secured
to the screen frame and which contain the an
nular, resilient shock absorbers all which sur
round the transverse tubular housing
This
housing is closed at one end by the cap 3'6 which
is secured thereon.
Within the housing 35 there is a shaft 3M
having coaxial end spindles 3‘! and 33 which are
eccentric with respect to the axis of the shaft
4.0
sand and when they reach the lower end of the
screen, the sand will predominate over the liquid
in the drop so that while not all of the sand will
be removed from the ?uid being screened a sub
stantial portion thereof will be extracted.
The drawings and the description are illustra
tive, only, while the broad principle of the inven
‘ tion Will be de?ned by the appended claims.
What I claim is:
1. In a vibrating screening unit a mud box
having vertical side walls, a vertical end wall at
and which are mounted in anti-frictionbearings
one end and a horizontal bottom, a portion of
39 and 4t suitably retained within the housing.
The spindle 38 is extended outwardly through 50 the bottom inclining toward the other end of
the box, and a wall at said other end of the box
the cap 4| screwed on to the corresponding end
which declines outwardly and whose upper mar
of the housing. The extended end of the spindle
gin merges with the adjacent end of the inclined
38 has a sheave t2 splined thereon through which
portion of the bottom; and a vibratory, forwardly
the shaft may be rotated. The inside diameter
declining, screen mounted above the mud box
of the shock absorbers
is somewhat less than
and extending transversely, approximately from
that of the clamps 33 so that there will be no
side to side, and longitudinally, approximately
metal to metal contact of the housing 35 with said
from end to end, of the box, with its upper, or
clamps.
_
feed, end above one end of the mud box and with
As the shaft 37a is rotated, it will impart vibra
its lower end positioned over and adjacent said
tion to the housing 35, by reason of its eccen
outwardly declining portion.
'
tricity, which vibration will be imparted through
2. In a vibrating screening unit, a screen com
the shock absorbers | l and will not be transmit
prising a frame formed with side members, means
ted to the main frame.
for anchoring said side members together in
The vibration imparted to the screen will there~ '
fore
a rather
not be
gentle
violent
vibration.
but on the other hand will be
The ?uid returning from the well will be cast
onto the screen as hereinabove stated and pass
on into the mud box and the shale and coarse
particles will pass down over the screen and be
spaced relation, a ?at, sheet-like foraminated
screening element, tension bars along the inner
sides of said side members having outwardly
turned ?anges, clamp means engageable over
said ?anges and over the side margins of the
screening element and clamping. the margins of
said element to said tension bars, a longitudinal
tension rod above the screening element which
the mud box but the fine sand will pass through
bears against said element approximately midway
the screen.
between its side margins, tension bolts passing
A substantial portion of the liquid will form in
drops on the underside of the screen, as shown 75 through said tension barsland side members and
discharged from the lower end thereof beyond
2,408,558
6
across the frame and approximately from end to
end thereof, clamp means clamping the side mar
bolts whereby tension may be applied to the
gins of the screen to the tension bars, a longi
screening element transversely to draw it tightly
tudinal
tension rod above the screen which bears
against said rod.
3. In a vibrating screening unit, a substantially CH against the screen approximately midway be
tween its side margins, tensioning means secu
rectangular screen frame formed with side mem
ring the tension bars to the side members and
bers, means'for anchoring the side members to
adjustable whereby tension may be applied to the
gether in spaced relation, tension bars along side '
screen transversely to draw it tightly against said
the inner sides of said side members and extend
ing approximately from end to end of the frame, 10 rod.
FRANK E. .HUTCI-HSON.
a substantially ?at, sheet-like screen extending
tension nuts threaded onto the outer end of said
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