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Патент USA US2109731

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March 1, 1938.
Original Filed April 1, 1956
2 Sheets-Sheet 1
[5 v
Ill. mczzyga, zaz
By a;
Patented Mar.v l, 1938
2,109,731 '
David L. McDonald, Amarillo, Tex.
Application April 1, 1936, Serial No. 72,191
Renewed July 31, 1937
4 Claims." (01,."166-5)
The invention relates to strainers, and more
particularly to a strainer for use at the lower end,
or at any other position in the casing of a well
for straining water, oil or other ?uids pumped or
taken from the well free of foreign matter; and
admitting gas through aperture from gas hear
ing formations at various depths.
, '
A very important object of the present inven
tion is to provide a strainer of the character and
10 for the purpose mentioned which is not likely to
become clogged, but which will operate with cf,
flciency at all, times.
The invention, together with its objects and
advantages, will be best understood from a study
of the following description taken in connec
tion with the‘accompanying drawings, wherein:
Figure 1 is an elevational view illustrating the
application of the invention to the casing of a
water well;
.threadedly engaged with vv‘the lower 'end of ithe'g' '
well casing l5_ as suggested inFlgure 1.
v The lower section 8 at, its lower ,edge ‘is-pro
lvided“ with either internal or. external threads
:16, through the medium-of ‘which said section is 5
threadedly engaged with the threaded stem of a
base or a foundation.“ disposed inv alignment
with the lower end of the well. casing and resting
on the stratum of clay I 8, ‘or engaged with the
threaded end of the well casing, tobe extended be- '10
low the bottom end of said strainer to any depth.
As shown in Figure 1, the strainer 5 is so dis
posed at the lower end of the well casing l5 as to
extend below the several earth strata. A and B
\into the ?ne sand or gravel stratum‘ l9 found in 15
sand water bearing or other formations.
It will thus be seen that with the sections or
units of the strainer thus assembled there is pro
vided a strainer having at intervals throughout
its length inlet openings 20' with a circular series
of passages 20 associated with each series of inlet NI0
openings'to the end that the water and foreign
Figure 2 is an elevational view of the strainer;
Fig. 3 is a longitudinal sectional view taken
substantially on the line 3-3 of Figure 2;
Figure 4 is an elevational view of two of the " matter drawn into the strainer will be forced
sections of the strainer, with said sections being to ?ow in an inward and upward direction
25 shown separated.
through the strainer. Thus with thisstrainer
Figure 5 is a top plan view of one of the ‘strainer while the water will travel in and rise upward to N) 5
its highest level above the strainer the gravel or
' Referring to the drawings by reference numer
the foreign matter will not. Hence, it is possible
als, it will be seen that the improved strainer is in
that a strainer of this character will permit use
30 dicated generally by the reference numeral 5 and
of a very ?ne gravel in a gravel wall, gravel treat- 30
comprises a plurality of substantially aligned ed or gravel packed well, and retain all gravel
sections including a series of intermediate sec
tions 6, a top section 1, and a bottom section 8.
The intermediate sections, 6 and the bottom
35 section 8 are identical in construction in that
each includes a substantially cylindrical lower
used in such treatment on the outside of the
strainer where it belongs, still retaining the ex
tra large inlet areas of the strainer. Further,
by such a construction and arrangement, the 5
strainer will tend to prevent gravel or other solid
body portion 9, a restricted intermediate portion ‘matter from ever entering the well to the end
Ill, and a cylindrical end portion ll of materially that the possibility of the strainer ever becoming
less diameter than the end portion 9.
clogged is practically obviated.
Also formed integral with the "parts III and II
It will be further understood that the strainer
of each of saidv sections 6‘ and I are ribs l2 embodying the features of the present invention 0
formed adjacent their lower ends with shoul
may be constructed of fabricatedmaterials, or
ders l3.
it may be cast. Further, the strainer can‘ be
The top section 1 is of cylindrical form and cheaply manufactured of metals best suited to
45 of uniform diameter throughout its length.
resist damaging effect of chemicals held in solu
As clearly shown, the ends I l of the sections tion in water to be handled, and that the strain‘
er may be used with all types of well casings, and
extend into the ends 9 of the next adjacent sec
tion and the portions 9 of the sections are welded may be installed without trouble, and at a much
greater depth than is feasible with concrete
50 or otherwise secured to the edges of the ribs l2
with the free ends of the largest portions 9 of strainers now generally employed.
Having thus described the invention, what is
sections 6 and 1 abutting the shoulders IS.
The top section 'I is provided at its free upper claimed as new is:
1. A strainer for wells comprising an elon
end with either internal or external threads ll
through the medium of which said section is gated substantially tubular structure adapted to
be connected at various positions in a well cas
ing, said structure being provided at intervals
with inlet openings and passages admitting
through apertures extending inwardly from said
openings parallel to the axis of the strainer, said
strainer consisting of a plurality of identical
cylindrical sections each having a relatively large
cylindrical end, and a relatively small cylindrical
end, with the smaller end of each section ?tting
in the larger~end of the next adjacent section,
and all said sections being hollow and open at
10 their respective opposite ends and means on, the
smaller ends of said sections engaging the larger
ends of adjacent sections to maintain the larger
sections in spaced longitudinal relation with re
spect to each‘other and in spaced concentric re
15 lation with respect to the smaller sections.
' 2. In a strainer for wells, a plurality of sub
stantially identical intermediate sections and
top and bottom end sections, said intermediate
sections and said bottom section each including
20 a cylindrical body open atits ends and having a
cylindrical end of relatively large diameter, a
second cylindrical end of relatively small diam
eter ?tting within the largest end of the next
adjacent section and a constricted intermediate
25 portion connecting the ends of said sections, lon
gitudinally extending spacing ribs formed on the
reduced cylindrical end of each intermediate
‘section, said ribs being reduced in width adjacent
the upper portion thereof to provide a shoulder
30 on each rib for supporting the lower edge of the
next adjacent section to maintain the large cy
lindrical sections in spaced longitudinal relation.
3. A strainer for wells comprising a plurality -
of elongated hollow sections, each section having
one end thereof of smaller outer dimension than
the other end, the smaller end being extended
into the larger end of the adjacent section for
a material portionof its length, means center
ing said smaller end in said larger end, and
meansv to secure 'said centering meansv integrally .10
to said ‘sections with the surfaces ,of said ends
spaced apart, thus providing passages extending
vertically between said ends for ?uid, the outer
surfaces of said larger ends being aligned longi
tudinally and of approximately uniform diam 15
4. A well strainer made up of inter?tting sec
tions including a lower section and an upper
section, the outer surface of said sections being
of approximately the same dimensions and sub 20
stantially parallel with the axis of the strainer,
the upper end of the lower section ?tting freely
within the lower end of the upper section, said
upper end being smaller than the lower end of
said upper section to provide a vertical passage 25
between the inter?tting ends for ?uid moving
upwardly into said strainer, and means to secure
said sections together and also to space said
upper end uniformly within the lower end of
said upper section.
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