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Патент USA US2412876

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Dec. 17,
Filed Feb. 19, 1945
Patented Dec. 17, 1946
Roy E. Edwards, Duncan, 0kla., assignor to Halli
burton Oil Well Cementing Company, Duncan,
Application February 19, 1945, Serial No. 578,712
2 Claims. (Cl. 166-18)
This invention relates to wire brushes, and
more particularly to steel brushes adapted to be
mounted on steel pipe or casing and lowered into
a well bore such as an oil well to clean the wall
with the bristles all running longitudinally of
the casing, but with portions of the brush ar
ranged in staggered relation upon the casing.
Other objects and advantages reside in certain
novel features ‘of the construction and arrange
ment as will be apparent from the following de
scription taken in connection with the accom
of the bore and to center the pipe therein.
In the drilling of wells with the rotary method
a mud is generally used which has the property
of caking or plastering upon the wall of the bore
panying drawing, in which:
I ‘
hole. After the well is drilled casing is lowered
Figure 1 is a side view of a section of easing
into the well bore and is usually cemented in 10 showing wire brushes constructed in accordance
place. The success of the cementing operations
with the present invention secured in staggered
in bonding the casing to the rock surrounding the
relation thereon;
bore hole depends to some extent upon the proper
Figure 2 is an enlarged cross-sectional view of
removal of the mud so that the Portland cement
a portion of the casing of Figure 1 showing the
or other bonding material can come in direct 15 construction and vmounting of the brushes; I
contact with the rock. The success of the ce
Figure 3 is a cross-sectional view of the ar
menting operation also depends to some extent
rangement of Figure 1 taken on the line 3-3
upon whether the casing is centered in the well
bore and upon whether the cement as it leaves
‘Figure 4 is a perspective view of the spring
the bottom of the pipe channels through the mud 20 arrangement used in mounting the bristles of
along only a portion of the periphery of the pipe,
the brushes of Figure 1.
or Whether it ?ows evenly on all sides of the pipe.
Referring to the drawing in detail, it will be
It has heretofore been proposed to employ wire
seen that a section of pipe adapted to be used
brushes on casing in oil wells to scrape the wall
as ‘casing in an oil well as illustrated at I0.
of the bore hole or to center the casing therein, 25 Mounted upon the casing in staggered relation
In general, the brushes heretofore proposed for
and partially overlapping are a number of sec
this purpose have employed wire bristles or spring
tions of channel irons II which have ?anges “I2
steel leaves which have been disposed spirally or
adapted to be welded or otherwise secured to the
circumferentially upon collars attached to the
casing. In mounting the channel irons upon the
casing at spaced intervals, and which perform
casing tapered end pieces I3 are preferably pro
their function of removing the mud sheath as the
vided and welded to the casing and to the chan
casing is lowered into the well. Such devices have
nel irons to offer some insurance against the
been used to some extent and perform a desirable
channel irons being stripped from the casing as
function. There is some danger involved in their
it is lowered into the Well. The channel irons II
use, however, inasmuch as cuttings or other ma 35 may be made of sheet metal, for example, of 10
terial suspended in the mud in the well bore are
gauge to Ill-gauge, and constitute the body of the
apt to clog or form what is known as a bridge
brushes upon which the bristles are secured.
around the brushes and prevent the flow of ce
As shown in Figure 1, the channel irons II
ment upwardly along the casing, even when high
are provided with a number of holes or apertures
pressure is exerted thereon so that the cementing 40 I4 disposed linearly along the longitudinal dimen
operations result in failure to properly cement
sions thereof, through which the bristles I5 ex
the casing.
tend. Within the concave portion of the channel
It is an object of the present invention to pro
irons II, a spring mounting for each bristle is
vide wire brushes adapted to be secured to the
provided together with means for securing the
outside of casing lowered into an oil well in 45 bristles to the channel irons.
which the bristles of the brushes are disposed
As best shown in Figure 4, two adjacent
longitudinally of the casing and in which each
bristles together with their spring mounting and
bristle is spring mounted in such a way that it
securing means are formed from a single piece
may perform the desired function of removing
of wire by bending it into a securing loop I6 and
mud sheath from the wall of the bore hole even 50 into four coil springs designated I‘I, I8, I 9 and
after being lowered thousands of feet to the bot
2B, coils I1 and 20 having their axes parallel to
tom of the well.
the plane of the bristles I5 while coils I8 and I9
It is a further object of the invention to devise
have their axes in a plane at right angles to the
a wire brush which can be cut into suitable
plane of the bristles I5. Thus, when the bristles
lengths and readily secured to casing in the ?eld 55 and their spring mounting are secured within
‘1 i
the channel I I as by means of a rivet 2| through
the loop l6, each bristle I5 is spring mounted for
transverse movement into a position tangential
to the casing I0 upon the distortion of the coil
spring to which it is adjacent, and for move
ment lengthwise of the casing upon distortion of
all of the bristles on any one brush are in line
the coil springs adjacent the loop l6_.
‘s s
longitudinally of the casing, there is little danger
that the brush will become clogged and prevent
the casing from being properly cemented in the
While only one embodiment of the invention
has been shown and described herein, it is ob
vious that various changes may’ be made with
The size'of- the wire used in vformingthe bristles
and spring mounting ‘therefor shown in Figure
4 may vary under different conditions, but 12:
gauge spring steel wire has been found suitable
10 .
out departing from the spirit of the invention
or the scope of the annexed claims.
I claim:
wire brush for well casing consisting of
With brushes constructed _as illustrated and
"a pieceof channel iron having 'a number of ap
m?unted upon a casing as, shown-3m" Figured,
ertures disposed linearly along the longitudinal
the casing may be lowered into the well without 15 dimension thereof, Wire bristles extending from
the concave portion of said channel iron to the
the brushes becoming excessively bent and dam
aged. As the casing is loweredinto the wellthe V , exterior ‘ thereof through said apertures and
means.‘ for yieldingly mounting said bristles in
coil springs l8 and I9 are distorted so that the
said channel iron, said means including two coil
bristles may lay nearly ?at upon the exterior ‘of
the channel irons H. When the casing has been 20 springs for each bristle, said coil springs hav
lowered to the ‘desired depth it may be rotat
ed; i'Astit is turned, the springs l1 and 20 cause
bristles to be‘ de?ected outwardly and remove the
mu'dsheath‘from the wall of the bore hole. In
theievent that the casing is laying against the
wallfof the bore hole on any one side as is us
ually the case, or, in the event that the Wall of
the bore hole is irregular so that the bristles en
counter obstructions tending to distort them as
‘ing their-axes disposed in planes at right angles
to teach other wherebyiieach bristle is spring
mounted for movement longitudinally of said
‘channel iron as "well as for movement trans
versely thereof upon distortion of ‘said coil
Z.v A brushing device for well casing adapted
to‘ remove mud sheath from the wall 'of a well
bore comprising a piece of pipe having a num
ber‘ of Wire brushes secured thereto in staggered
*tlie'c'asing is' rotated, the springs I1 ‘and 20 are 30
distorted and permit the'bristles to pass by the
relation, each brush consisting of a piece of
obstruction without becoming bent out of shape
excessively. The action of the spring mounting
for the bristles is such astotend to force the
casing into the center of the well bore.
In Figures’ 1 and'3, the'brushes 'have been
"shown mounted on the casing‘ wspaced 120 de
channel iron disposed longitudinally of said
pipe, each channel ironhaving a'number of ap
ertures disposed linearly along the longitudinal
35 dimension thereof, wire bristles’ extending from
the concave portion of said channel iron to the
vexterior thereof through said apertures and
means for yieldingly mounting said bristles in
grees. It is, of course, within the purview of the
invention to ‘vary, this spacing as well as to vary
said channel iron, said means including two coil
the longitudinal spacing of the brushes along the
casing. However, in order to insure the main
springs vfor‘ eachbristle, said coil springs havé
ing'theirz'axes‘ disposed in planes at right angles
tenance ofsu?icient space to allow the mud and
Tthelcement which is used to secure the casing in
place adequate ‘clearance between the brushes,
to'ea'ch other whereby each bristle is spring
mounted ‘for movement longitudinally'of said
channel iron ‘as well as for movement transversely
the "best "practice requires that the brushes not .) thereof upon distortion of said coil springs.
bermounte’d too closely together either longi
tudinally or radially.’ In view ‘of ‘the'fact that
' ROY ErEDwARDsl. ’
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