Cleaning Device for Wells Page: 2 of 3
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UNITED STATES PATENT OFFICE.
DAVID A. GARDEN, OF HOUSTON HEIGHTS, TEXAS.
CLEANING DEVICE FOR-WELLS.Specification of Letters Patent.
Patented Mar. 19, 1918.
Application filed July 21, 1917. Serial No. 182,088.
To all whom it may concern:
Be it known that I, DAVID A. CARDEN,
a citizen of the United States, residing at
Houston Heights, in the county of Harris
and State of Texas, have invented certain
new and useful Improvements in Cleaning
Devices for Wells, of which the following
is a specification.
This invention relates to new and useful
10 improvements in a cleaning device for wells
and is particularly adapted for the purpose
of the washing out of the well screen after
it has been set in the bore.
Well screens now in most common use are
15 formed of perforated pipe usually wrapped
with screen wire, the turns of which are
spaced apart and, as the screen is lowered
into the bore, the slits between the turns of
wire become clogged and filled with sand
20 and dirt and after the screen is set it must
be washed out by forcing water under pres-
sure, down within the screen and through
the slits between the turns of wire. Also
after the screen has been in the well for a
25 time, the slits gradually become clogged up
by particles of sand and detritus so as to
restrict and some times entirely cut. off the
inflow of fluid. The object of this inven-
tion is to provide a device for the purpose
30 of washing out the screen when it has be-
come, for any reason, clogged.
With the above and other objects. in view,
the invention has particular relation to cer-
tain novel features of construction, opera-
35 tion and arrangement of part:, an example
of which is given in this specification and
illustrated in the accompanying drawings
wherein:-
Figure 1 is a side elevation of the device
40 located within the screen.
Fig. 2 is a fragmentary vertical sectional
view thereof.
Fig. 3 is a transverse sectional view taken
on the line 3-3 of Fig. 2.
45 Fig. 4 is a transverse sectional view of a
packing ring employed.
Fig. 5 is a plan view thereof.
Fig. 6 is a transverse sectional view of a
form of washer employed, and
50 Fig. 7 is a plan view thereof.
Referring now hore particularly to the
drawings, the numeral 1 indicates a well
screen which is formed of perforated pipe
wrapped with suitable screen wire 2, the
55 turns of which are spaced apart. This screenis set in the bore and there is usually a
space 3 between the screen and the wall of
the bore. The oil flows in through the slits
between - the screen wire 2 from the sur-
roundino- reservoir into the interior of the 60
screen. 'However, in setting the screen, the
slits between the turns of wire often become
clogged with sand and other detritus and
before the oil can enter the screen, said
screen must be washed out and cleaned. For 65
the purpose of accomplishing this object I
have provided a device which will now be
described :-This device includes two sec--
tions of pipe 4 and 5 which are spaced apart
and each of which is. provided with a plu- 70
rality of perforations 6, said sections 4 and
5 being connected by means of a pipe sec-
tion 7 provided with a plurality of small
perforations 8, said section 7 being connect-
ed to the adjoining sections by the collars 75
9 and 10. Fitted over each of the sections
4 and 5 are the metallic washers 11 which
are spaced apart. These washers fit closely
around the respective sections and between
them are the open packing rings 12 which 80
surround the respective sections 4 and 5 and
are spaced therefrom. The end washers are
secured on the section 4 by means of the re-
spective collars 9, 9', which are screwed on
the respective ends of said section and abut 85
against said washers and the end washers
are secured on the respective ends of the
section 5 by means of the collar 10 'and the
cap 10' which are screwed on the respective
ends of said section 5. The device is let 90
down into the screen by means, of a string
of. pipe 13 and water is then forced down
through said string under pressure by means
of a force pump located at the surface. The
perforations of the sections 4 and 5 have a 95
greater capacity than those of the section
7 and a portion of the water passes through
the first mentioned perforations and forces
the packing rings 12 open causing them to
expand against the inner walls of the screen 100
on all sides forming a water tight joint with
said screen and preventing the passage of
water between the screen and the sections
4 and 5. The remainder of the water passes
through the orifices 8 provided in section 7 105
and out through the portion of the screen
opposite said last mentioned section and
passes thence along the space 3 and enters
the screen above the section 4 below the sec-
tion 5. This current of water being under 1101,259,721.
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Carden, David A. Cleaning Device for Wells, patent, July 21, 1917; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257417/m1/2/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.