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Патент USA US2131836

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Oct. 4, 1938.
E. ‘E. DAVIDSON
2,131,836
VARIABLE CHOKE
Filed May 24, 1937
5. .5. zwwbsom
2,131,836
Patented Oct. 4, 1938
i
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“UNITED,
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" ' STATES
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2,131,836‘_
PA'Tj'ENT-"V'OFFICE
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VARIABLE onokn
Edward E. Davidson, Houston?l‘ex.
_ ‘v
Application May 24,1937, Serial No. 144,384‘
(01. 138-45)
1 Claim.
This invention relates to ‘a variable choke of
a type adapted for‘use in connection with oil
wells and in similar ‘situations.
‘
'
~ It is customary, and ‘in certain localities re
UL quired by law, to test the production of new oil
wells by. causing the wells to flow through a
standard ori?ce or choke.‘ From this test it is'
determined how much the well should be al
lowed‘ to produce, and the production of the
10 well is thereafter controlled by causing, it to
flow through» a choke so that it will produce
only the amount which it has been determined
it should produce.
Previously, it has been the custom to insert
the standard choke, or such other choke as may
be decided upon, by removing a bull plug on
one branch of a T or cross, andinserting the
choke through the T or cross into an inter
nally threaded section in the flow line on the
'20 opposite, side of such ?tting. The bull plug is
then replaced and the valves opened to flow the
well.
‘
'
The di?iculty with the practice just set forth,
however, is that in many instances it is nec
essary to make numerous and frequent changes
25 in the size of choke employed in order to cause
the well to produce at the desired rate.
This
under the previous practice involved shutting
down the well each time by closing the gate
valves ahead of the choke,‘ removing the bull
plug through which the chokes are inserted, re
moving the choke from the flow line, inserting
the new choke, and replacing the bull plug. This
is a job requiring a considerable length of time
and involving in each change the necessity for
735 screwing a choke out of position and screwing
another choke into position within the ?ow line.
In addition to the time and labor involved
in making the changes in the chokes under the
40 previous practice, the threads with which the
chokes are engaged within the flow lines after
many changes in chokes will deteriorate. until
it may become necessary. to disconnect the flow
line and replace a section thereof with a new
'
45 internally threaded part.
In the past, attempts have been made topro
vide variable chokes which could be changed
without the necessity for replacing the choke
within the flow line in order to vary and regu
50 late the. amount of‘?uid produced by the well.
However, these have for the most part relied‘
upon the principle of the needle valve in' which
the valve is moved by means of threads or the
like toward or away from a seat within the ?ow
55
line so as to obstruct‘ flow past. said seat in a
greater, or lesser degree’ as desired. However,
when used with high pressure wells it has been
found that such apparatus will cut out very
60 quickly due to the rapid flow therethrough, and
these‘ chokes have not beengenerally used for
this
reason.
~
I
‘
l}.
.
'It is an object of this invention to provide
a‘ variable‘ choke ‘which will- make possible a
change from one size of choke to another with
out the necessity for dismantling any part. of
the apparatus, and without involving any‘ of the
defects and shortcomings in the prior art struc
tures.
I
‘
r
7
It is a further, object of this inventionto pro 10
vide a variable choke'which may be varied to
present a choke oifany given size with substan
tially no loss of time or expenditure of labor.
It is. a further object to provide a variable
choke which will not be any more susceptible
of cutting out than are the standard chokes cus
tomarily employed.
It is a further object to provide a variable
choke, the wearing parts of which may be re
moved and replaced with a minimum of effort 20
and without dismantling the flow lines at any
time that replacement may be found necessary.
It is a further object of this invention to pro
vide a ‘variable choke which may be opened to
permit free flow without any choking action 25
whatever;
It‘ is a further object to provide a variable
choke adapted to receive a standard choke for
purposes of testing production.
Qther objects and advantages of this inven- 30
‘
tion will become apparent from the following
description taken in connection with the ac
companying drawing, said drawing and descrip?
tion being by way. of illustration and example
only, and not by way of limitation.
In the drawing:
35
.Fig. 1 is a vertical cross section illustrating
a choke constructed in accordance with this in
vention.
.
-
i
Fig. 2 is'a horizontal cross section taken along 40
the line 2-2 of Fig. 1.
g
r Fig. 3 is a vertical cross section at right angles
to‘ that shown in Fig; 1 taken along the line
3--3 of Fig. ,1.
V
'
Fig. 4 is an elevation illustrating the choke 45
shown in Fig. 1 connected to a portion of a
Christmas tree.
7
The choke illustrated in the drawing consists
of a body member I of elongated formation and
having a passageway therethrough. At one end,
the body member is externally threaded as il
lustrated at 2' to‘ receive the cross 3 forming a
portion of a Christmas tree. At its other end,
it is formed as illustrated at 4 to receive'a ?ow
line 5.
'
»
55
The upper branch of the cross 3 is closed by
means of a bull plug 6 to which a pressure
gauge 1 is connected in the usual manner. ‘The
lateral branch of the cross opposite the choke ’
is provided with a bull plug 8_, and the lower 60
2
2,131,836
portion of the cross is connected to the portion
9 of the Christmas tree.
The passageway through the body I for the
major portion of the length of the body is of an
elongated cross section as shown at I0. That is,
one dimension is substantially twice the other.
At-its intake end, however, the passageway is re
duced as indicated at II to a cylindrical bore of
substantially the same diameter as the shortest
10 dimension of the remainder of the passageway.
The outer end of this bore is threaded at I2 to
receive a standard choke such as is used in test
ing the production of a well to determine the
amount it shall be allowed to produce.
15
Intermediate its ends and intersecting the
passageway I0 the body I is formed with a plu
rality of slightly tapered lateral openings I3
adapted to receive respectively a series of plug
valves which have in thisdisclosure been indi
20 cated by the numerals I4 to I8, inclusive. Each
of these plugs has a transverse opening I9 there
through after the manner of the customary plug
valve, these openings I9 in the various plugs be~
ing of substantially the same size as the bore II
and in alignment with that bore and with each
other so that when all of the plugs are turned to
place their openings I9 in alignment with the
passageway I0 a substantially unrestricted pas
30
sageway will be provided through the body I.
Each of the plugs, however, is provided with a
second transverse opening at substantially right
angles to the openings I9, these second men
tioned transverse openings being designated by
the numerals 20 to 24, inclusive, and varying in
35 size depending upon the sizes of the choke open
ings which it is desired the device shall be ca
pable of providing. As illustrated 'in_ the draw
49
ing, the openings I9 and the bore II are so po
sitioned as to be in alignment with one side por
tion of the cross section of the passageway I0.
The openings 20 and 24 inclusive, are off-set from
the openings I9 and are arranged to be in align
ment with the other side portion of the open
ing Ill.
The external surface of the body I adjacent
the open ends of the tapered openings I3 is pro
vided with a seat 25 adapted to receive a plate or
gasket 26 which serves the dual purpose of form
ing a seal about the open ends of the openings
I3 and of retaining the plugs I4 to I8, inclusive,
in position within the body I. Positioned against
the exterior of the element 215 is a ?tting 21 held
in place by means of screws 28 or the like and
formed with portions 29 providing stu?ing boxes
adapted to receive packings 30. These pack
ings 30 are compressed by means of gland nuts 3|
so as to provide a seal about the stems 32 of the
plugs I4' to I8, inclusive. These plugs may be
rotated as desired by means of squared portions
60 33 formed on the external ends of the stems 32.
In operation, the well is ?rst connected with
the body I in position as illustrated in Fig. 4,
and with a standard choke threaded into the
opening I2. All of the plugs I4 to I8, inclusive,
are rotated so that the openings I9 will be in
alignment with each other and with the open
ings I I and I2. The well is then permitted to
?ow through the standard-choke until its capacity
is determined and the rate at which it is to ‘be
allowed to produce decided upon, The well is
then shut down by means of gate valves custo
marily provided (not shown) and the ‘bull plug
8 is removed. By means of a suitable wrench
provided for the purpose which is inserted
through the cross ?tting 3 the standard choke is
then removed from the threaded opening I2 and
taken out through the opposite lateral branch of
the cross member from which branch the bull
plug 8 has been removed. The bull plug 8 is
then replaced and whichever one of the plugs
I4 to I8, inclusive, is desired is rotated so that
the opening I9 therein is at right angles to the 1O
passageway I0 and so that the smaller opening
20, 2|, 22, 23 or 24, as the case may be, is placed
in alignment with the lower portion of the pas
sageway I 0. The well is then opened and allowed
to ?ow.
Assuming that the opening 22 of the plug I6
has been placed in alignment with the passage
way ID as illustrated in Fig. 1, the well will then
be in e?ect ?owing through a choke of the size
of the passageway 22. If, however, it be found
that the well ?owing through this passageway 22
produces oil more rapidly than desired, the plug
I1 or the plug I8 may be rotated so as to place
the opening 23 or the opening 24, as the case
may be, in alignment with the passageway Ii], 25
aftervwhich the plug I6 will be rotated to place
the opening I9 in alignment with the passageway
I0. Similarly, if the ?ow through the opening
22 be found to be too slow, the plug I4 or the plug
I5 may be rotated so as to place the opening 20 30
or the opening 2I in alignment with the passage
way IIJ. Thus, it will be seen that the choke
opening provided for the flow of oil or other
?uid may be changed at will with substantially
no loss of time or expenditure of labor, and with
out necessity for shutting down the well.
It will
further be seen that the number of choke open
ings available is limited only by the number of
plugs provided in the body I, and it will be ap
preciated that this number can be varied to pro 40
vide either more or less plugs than illustrated,
<fiepending upon the need which may exist there
or.
It will further be appreciated that inasmuch as
the choke openings provided by this invention
are not determined by adjustment, but are prede
termined when the openings 20 to 24, inclusive,
are formed, there will be no errors introduced
due to faulty adjustment such as is possible with
the needle valve type or adjustable choke, and
the wear will be no greater than would exist with
the standard choke.
Having described my invention, I claim:
In a choke connection, a body having a rela
tively large passageway therethrough and a plu
rality of rotatable plugs extending transversely
of and interrupting said passageway, each plug
having a relatively large opening, all of which
are of substantially the same size and adapted
to be arranged in alignment with each other to oo
provide a substantially unrestricted passage
through the connection, and each plug having a
smaller, opening therethrough at a substantial
angle to and off-set from and independent of the
larger opening, said smaller openings being of
varying sizes in the ‘respective plugs whereby one
of said plugs may be rotated to move the larger
opening out of alignment with. the passageway
and the smaller opening into alignment therewith
to provide a selective predetermined restriction in 70
said passageway.
EDWARD E._DAVIDSON.
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