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Патент USA US2124766

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July 26, 1938.
‘E. H. COX
‘
2,124,766
WELL TESTER
Filed March 20, 1937
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July 26, 1938.
'
E, H, ‘cox
2,124,766
WELL TESTER
Filed March 20, 1,937
2 Sheets-Sheet 2 v
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Ernest H.cog>§wmm
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Patented July 26, 1938
' 2,124,766
UNITED STATES
I
PATENT orrics - '
2,124,706
WELL 'rss'raa,
‘nest 11. Cox, Houston, Tex.
Application rum-h so, 1931, Serial No. 131,995 ,
‘
_ ,8 Claims.
(01. ass-1)
My invention relates to well testers for the pur
pose of making a test of the productivity of the
formation encountered in well drilling.
It is an object of the invention to provide a con
struction of well tester which will be operable
through a single string of pipe or drill stem and
which will be capable of positive action to open
and close the interior of the tester to receive
and then cut off a sample of the formation in
10 which the test is made.
_
-I desire to provide a well tester which may be
employed in‘ connection with a hole of reduced
diameter extended ahead of the main well hole,
it
Fig. 7 is a transverse section on the plane 1-‘!
of Fig. 6; and
r
Fig. 8 is a similar transverse section on the
plane 8—8 of Fig. 6.
i
The construction of the sample receiving por- 5
tion of the invention is disclosed particularly in
Figs. 5 to 8, inclusive. This device is adapted to p
be secured to the lower end of a section of pipe I
which may be drill stem or other pipe. The de
v’ce is connected to the drill pipe by means of a 10
coupling 2 of ordinary construction. The upper
end ofv the tester comprises a nipple 3 threaded
at its upper end for connection with the coupling
and ordinarily referred to as a rat hole, and to be and having its outer diameter increased to form‘
operated by a down
11 pressure exerted upon , adjacent the lower end a shoulder 4 against which 15 the operating stem. .
It is a further object of the invention to pro
vide an e?icient means of sealing the tester
against the entrance of ?uid under pressure be
fore the device is moved to open position.
It is a furtherobject of the invention to provide
in connection with a tester of this character a
' means for introducing into the well bore a stream
of ?ushing viiuiii when gas under pressure is en
countered‘. "
‘I
i
I
I
It is a further object of the invention to pro
vide a chamber for the reception 'of a sample of
the contents oi‘ the well which may be held in
_ the compression spring 5 vmay hear.
The lower
end of the nipple is interiorly threaded at 6 to
engage with the tubular upper end of a mandrel 7.
vThe nipple 3 is -formed with a longitudinal
axial passage 8 for ?uid and the upper end of
this passage is formed into a valve seat to re
ceive the ball valve 29.
The mandrel ‘I is a solid shaft of steel except
adjacent the upper end where it is provided with
an axial passage 9 for ?uid entering the tester 25
from the well bore. This passage extends a short
‘distance downwardly within the mandrel and is
connected at its lower endwith the exterior
thereof through lateral passages ill. The lower
body ll oi’ the mandrel is reduced in diameter 30
The invention resides largely in the particular somewhat, as shown at l2 to allow 'the passage
construction and arrangement oi’ the parts mak
of liquid around the outside of the mandrel and
ing up my tester.
I
between the same'and the outer sleeve 83.
This construction will be more clearly under
The sleeve i3 is threaded within the lower end
stood through reference to the drawings and de
of a head it, said head ‘being ‘spaced from the 35 v
scription thereof which follows:
mandrel and having an inner recess to receive
In the drawings, Fig. i is a side view of h;- tester therings of packing is. Said rings are supported
showing the drill stem partly'in central lonm= upon a shoulder in the head and are adapted to
I ' closed-position while the well is being ?lled with
tudinalsection.
'
‘
- be compressed into sealing engagement with the
Fig. 21s an enlarged longitudinal section show
outer surface oi’ the mandrel by means of a gland 40
ing the arrangement by which the ?ushing ?uid ‘ it threaded within the upper end of the head it.
may be discharged into the well while the test
' The upper end of the head Hi forms a lower.
is being made.
. shoulder against which the compression spring 5,
Fig. 3 is a transverse section on the'plane M previously referred to, may engage. I contem
of Fig. 2.
plate forming a protective housing ll about the
Fig. i is a broken detail taken on the plane spring by means of a sleeve of metal threaded
at its lower end to the head it and projecting‘
tt-t of Fig. 3 and showing a valve control dis
charge opening for the ?ushing ?uid such as may upwardly beyond the spring and along the outer
surface of the nipple t and ‘?tting slidably against
be employed.
said nipple.
Fig. 5 is a central longitudinal section through
The sleeve 63 extends downwardly from the
the well tester.
Fig. 6 is a side view partly in elevation and
55
partly in ‘section illustrating the tester in open
position.
head I‘ for a suitable distance and has openings
or perforations l8 adjacent the lower end through
. which ?uid from the well bore may pass.
Above the perforated portion of the sleeve I -55
2,124,760
form a packer made up of ?at plates or washers
- _ is of ?exible packing material spaced apart by
rings 20 of metal or other rigid equivalent mate
rial. The lower one of the packing washers I3 is
supported upon a downwardly tapered ring 2i,
which is in turn supported upon a ring v22 screwed
upon the outer surface of the sleeve l3. ‘Itwill be
noted that the outer surface of the head I‘ is
tapered downwardly and that the packing washers
is are adapted to. be compressed against the
10 inner wall of the rat hole, the tapered area of the
be seen from Fig. 4, there is an outlet from the
valve chamber 34 downwardly at an inclination
. as is indicated at 31 in that ?gure.
Thisoutlet discharges to the lower side of the
central enlarged portion of the circulating head
21. It will be seen from this construction that
?uid pumped downwardly in the drill stem may
pass through the passages 32 and 33 to the valve
chamber and after passing the valve may be pro
Jected downwardly through the outlet 31 into 10
the well casing 38.
Above the circulating head 31 I screw within
head“ engaging within the upper portion of the
rat hole, thus together forming a seal around the , the upper portion of the passage 28 an upwardly
extending chamber or passage 39 upon the up
tester when it is in operative position at the bot
tom of the well.
15
‘
.
At the lower end of the solid portion H of
the mandrel I have screwed a cap 23, said cap
. having an upper shoulder at 24 which limits the
. relative downward movement thereon of the
20 sleeve i3, the lower end of said sleeve being held
against said cap by the spring 5 previously de
' scribed. The lower end of the sleeve may have
thereon a skirt 2! ?tting slidably over the upper
portion of the cap 23 and tending to prevent the
25 entrance of sand or sediment thereto.
With the parts of the tester arranged as shown
in Fig. '5 the passages Ill leading to the interior
of the tester are closed by contact with the seal
ing rings it. when pressure is exerted upon the
.30 drill stem sufilcient to force the mandrel down
_ wardly relative to the sleeve l3 the spring 5
will be compressed and the mandrel will be
' shoved downwardly into the position shown in
Fig. 6, with the openings ll exposed below the
packing rings. In this position ?uid from the
well may enter through the openings i3 in the
sleeve and pass upwardly around the solid por
tion of the mandrel and enter the openings i0
and from thence pass upwardly through thepas
sages 3 and 3, and ‘by raising the ball valve 29
may pass upwardly into the chamber 23 within
the pipe or drill stem I.
It frequently occurs that when a. test of‘ this
kind is made there is found to be a pressure of
45 gas in the well which tends to blow upwardly
through the casing and to thus damage the well.
To avoid this, it becomes necessary to pump mud
downwardly into the well so as to weight down
the gas within the well and carry away the
50
aerated portion of themud into which‘ the gas
has entered. In order to accomplish this in con
per end of which is placed a standing valve pre
venting the entrance of liquid thereto from
above. Said standing valve is of ordinary con
struction having a valve cage 40, an inner valve
seat 4|, and a ball valve 42 in said cake and
20
resting upon said seat.
It will be seen that when occasion arises to
force mud down through the drill stem and into
the well bore this may be done without interferw
ing with the sample of the formation which has
been
taken.
Fluid
circulating
downwardly 25
through the stem will be shut oil from the
tubular extension 33 by the standing valve and
will be circulated outwardly into the well bore
through the circulating head as described. The
sample of formation which enters through the 30
tester as described may pass upwardly past the
lower ball valve 29 and into the chamber pro
vided by the section of the drill stem i and the
extension tube 33 above the circulating head.
This chamber may be opened when the tester
has been withdrawn from the well and- the sam
ple of well ?uid may be found retained within
the chamber thus provided.‘
"
The advantage of my invention lies in the
simple construction whereby the inlet to‘ the re
ceiving chamber is closely» sealed, during the in
sertion of the device into the well, by means of
the packing rings It. This chamber will, how
ever, be opened to receive the well ?uid by the
relative'downward movement of the mandrel in 45
the sleeve into position to expose the entrance
openings It. When the test has been made the
pressure on the device may be released by'mov
ing the drill 'stem upwardly, thus automatically
closing the further entrance of liquid to the 50
receiving chamber.
There is the further advantage that ?uid may
be circulated into the well in case heavy gas
pressures are encountered without interfering»
with the sample contained within the receiving 55
nection with the tester and thus avoid dangerous
blowouts I have provided means whereby the
sample may be retained within the tester and
55 drill stem and still allow the circulation of mud.
To accomplish this I provide a circulating head chamber. I am thus enabled to make ‘a satis
factory test and still be enabled to circulate
21, .which is threaded at both ends for connec
tion within the drill stem. This head comprises ' where emergency arises so as to prevent a blow
out of the gas from the well.
a heavy casting of metal having a central pas
The further advantages of the invention will
sage
28
therethrough,
the
lower
end
of
which
is
60
partially closed by a plug 30. Said plug is be obvious to those skilled in the art. ,
What is claimed as new is:
screwed within the lower end of ‘the circulating
1. Means for testing the productivity of wells
head and has a restricted bore 3| longitudinally
thereof. Within the upper body of the head I including a string of pipe, a chamber therein nor
mally-closed at its lower end but adapted to be 65
65 form a plurality of downwardly extending pas
opened to receive a sample of the ,well ?uid in
sages 32. Said passages terminate approximate
1y midway of, the length of the head and are ,{response to downward pressure on said string
connected with laterally extending branches 33 , when said chamber is supported at the-bottom of
, which discharge into valve chambers 34. As will the well, valves adjacent the upper end 'of said
chamber to prevent downward passage 'of ?uid
70 be seen from Figs. 2 and 4, these valve cham
bers are closed at their upper ends by threaded therein, and means in said string to discharge
plugs 35. The passage 33 is extended upwardly ?ushing ?uid from said string when said testing
into said chamber and a ball valve 36 in said .means is being operated.
2.‘ Means for testing the productivity of wells
upward extension tends to prevent the passage
of ?uid backwardly into the drill stem, As will including a string of pipe, a chamber therein in 75
75
/
2,124,768
eluding a section of said string and a standing
barrel extending upwardly above said section,
said chamber being normally closed at its lower
end'butadapted to be opened to receive a sample
of the well ?uid in response to downward pressure
on said string when said chamber is supported
at the bottom of the well, valves adjacent the
- upper end of said chamber to prevent downward
10 passage of ?uid therein, and means in said string
to discharge ?ushing ?uid from said string when
said testing means is being operated.
» 3. Means for testing the productivity of wells
including a string of pipe, a chamber therein in
15 cluding a section of said string and a standing,
barrel extending upwardly above said section, said
chamber being normally closed at its lower end
but adapted to be opened to receive a sample of
the well ?uid in response to downward pressure
20 on said string when said chamber is supported at
the bottom of the well, an upwardly opening valve
in said chamber, a circulating head in said string
above said valve to direct ?ushing ?uid from said
string, a passage upwardly through said head and
25 a standing valve at the upper end of said passage.
4. A well tester for use in a well having a hole
of reduced diameter at its lower end, including
a single string of pipe, a test mandrel at its lower
end, an axial passage in said mandrel for a short
30 distance at its upper end, the lower end of said
mandrel being solid, a sleeve spaced slightly from
said mandrel, there being openings from said
passage to the interior of said sleeve and openings
insaid sleeve, packing elements in said sleeve
35 normally closing the openings in said mandrel,
means holding said sleeve normally downwardly
on said mandrel, a stop member on said mandrel
limiting the downward movement of said sleeve
thereon, a packer on said sleeve to engage the
upper end of said reduced diameter well hole,
said mandrel being movable by pressure relatively
downwardly in said sleeve to move said openings
below said packing to receive ?uid from said
sleeve.
-
5. A well tester for use in a well havinga hole
.
.
3
normally closing the openings in said mandrel,
means holding said sleeve normally downwardly
on said mandrel, a stop member on said mandrel
limiting the downward movement of said sleeve
thereon, a packer on said sleeve to engage the
upper end of said reduced diameter well hole, said
mandrel being movable by pressure relatively
downwardly in said sleeve to move said openings
below said packing to receive ?uid from said
sleeve, and a valve at the upper end of said man 10
drel to prevent the passage of ?uid downwardly
in said mandrel and sleeve.
6. A well tester including a single string of pipe,
a perforated sleeve on the lower end thereof, a
packer on said sleeve, a mandrel on saidpipe
having a hollow portion with openings from the .15
.interior to said sleeve and slidable in said sleeve,
means on said mandrel to limit the movement
thereon of said sleeve, packing rings in said sleeve
normally closing said openings, means to hold .20
said sleeve resiliently downwardly to close said
openings, an upwardly opening valve closing the
upper end of said hollow portion, and means to
discharge ?ushing ?uid from said string ofpipe
above said tester.
25
7. A well tester including a single string of
pipe, a perforated sleeve on-the lower end thereof,
a packer on said sleeve, a mandrel on said pipe '
having a hollow portion with openings from the
interior to said sleeve and slidable in said sleeve, 30
means on sald'mandrel to limit the movement -
thereon of said sleeve, packing rings in said sleeve
normally closing said openings, means to hold
said sleeve resiliently downwardly to close said
openings, an upwardly opening valve closing the 35
upper end of said hollow portion, means to dis
charge ?ushing ?uid from said string of pipe
above said tester, and a chamber in said string
for well ?uid between said valve and said ?ushing
?uid discharge means.
40
8. In a well tester including a single string of
pipe,'a testing chamber at the lower end thereof
and means to close and open the lower end of
mandrel being solid, a sleeve spaced slightly from
said chamber, thecombination of a circulating
head in said string above said testing chamber, 45
said head acting to close the passage of ?uid up
wardly in said string except for a restricted axial
passage, a tube extending upwardly from said
passage, a standing valve thereon, discharge
passage to the interior 01’ said sleeve and openings
circulating head to the well.
of reduced diameter at its lower end, including
a single string of pipe, 0. test mandrel at its lower
end, an axial passage in said mandrel for a short
distance at its upper end, the lower end of said
50 said mandrel, there being openings from said
in said sleeve, packing elements in said sleeve
passages in said head for ?uid from above said 59
ERNEST H. COX.
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