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Патент USA US3040683

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June 26, 1962
H. DUNBAR
3,040,673
TUBULAR SUCKER RODS
Filed Jan. 25, 1960
2 Sheets-Sheet 1
Huey Dunbar
Inventor
June 26, 1962
H. DUNBAR '
3,040,673
TUBULAR SUCKER RODS
Filed Jan. 25, 1960
2 Sheets-Sheet 2
FIG. 3
Huey Dunbar
Inventor
By%
Attorney
United States Patent 0 ” ICC
3,040,673
Patented June 26, 1962
1
2
ing means is provided in the lower end of tubing 16 to
seal the space between connecting member 38 and the
inner walls of tubing 16. Although there are many ways
of providing this sealing means it can conveniently be
3,040,673
Huey Dunbar, Maracaibo, Zulia, Venezuela, assiguor to
TUBULAR SUCKER RODS
Jersey Production Research Company, a corporation
of Delaware
done as illustrated.
Filed Jan. 25, 1960, Ser. No. 4,305 '
A packing recess 42 is provided in
upper end plate 40 of 'working barrel 20. Packing 44 is
placed in packing recess 42 and is held there by bushing
7 Claims. (Cl. 103-179)
46. It is thus seen that an elongated annular reservoir
This invention relates to vwell pumping equipment and
more particularly to well pumping equipment for deep 10 47 is formed in tubing 16 above the sealing [means and the
exterior of hollow sucker rod 18.
’ _
wells. It relates especially to a system of pumping a deep
Passageway 50 with check valve 49 is provided in plate
well by using hollow sucker rods.
40. Passageway 50 established ?uid communication be
In pumping oil wells it is a common practice to sus
tween the interior of working barrel 20 above piston 22
pend a string of tubing from the surface of the earth
to a point below the level of the oil in the well and to re 15 and the ‘annulus between tubing 16 and casing 10.
Although not necessary, check valve 49 may be in
ciprocate a plunger within and near the bottom of the
stalled in passageway 50 to permit ?uid to ?ow out of
tubing by means of a long line of sucker rods extending
working barrel 20 through passageway 50 but prevent it
through the tubing and motivated by a power unit at the
entering therethrough.
.
surface of the earth. It is obvious that a well may at
An
annulus
packer
52
seals
the
annulus
between work
tain such depth that the strain on the sucker rods Will 20
ing barrel 20 and casing 10 at a position below the out
reach a value in excess of the tensile strength of the rods,
let of passageway 50. Many well known conventional
entailing parting or rupture of the rod. When the sucker
packers are available which are suitable for this use.
rods break, a great expense and loss of time is incurred in
A liquid 54 is retained in reservoir 48 to at least par
replacing the broken rods.
Accordingly an important object of this invention is to 2 tially sustain the weight of hollow sucker rod 18. The
liquid should have as high a speci?c gravity as possible
reduce the strain on a string of sucker rods so as to mini~
to add buoyancy to hollow sucker rod 18. The speci?c
mize breakage thereof.
gravity of the liquid should preferably exceed 1.00.
It is another object of this invention to provide a system
Liquid 54 should further be noncorrosive to the tubing
whereby the effective weight of the long line of sucker
rods on a pumping unit at the surface is reduced.
- 'An'additional object of the invention is to provide a
or hollow sucker rods.
system so that larger bore pumps can be set deeper to pro
duce higher volumes of ?uid than is possible with any
conventional sucker rods.
These “and other objects and details of the invention will 35
be apparent from the following description, when read
in connection with the accompanying drawings; wherein:
FIG. 1 illustrates, partly in section, a part of an oil well
equipped with pumping means and tubular sucker rods
embodying features of the invention;
FIG. 2 is a horizontal section on the lineqZ-Z of FIG.
1; and
FIG. 3 illustrates a different embodiment showing a
di?’erent pumping means.
The liquid also should not con
30 tain settleable solids. A suitable liquid is a solution of
potassium carbonate in water. In a speci?c example,
potassium carbonate was added to distilled water in the
proportion of about 616 grams of potassium carbonate
per 500 milliliters of Water. The gravity of this solution
at 170° F. was 1.53.
.
In the operation of this apparatus, tubing 16 (with hol
low sucker rod 18 suspended therein and pumping means
suspended at the lower end of the tubing in a manner
40 similar to that illustrated in FIG. 1) is lowered within a
well to the ?uid to be produced. Annulus packer 52 is
then set below the outlet of passageway 50. Liquid 54 is
then used to at least partially ?ll reservoir 48. Pumping
operations are then begun rby reciprocating sucker rod 18
Referring to the drawing, casing 10, lining the well, is 45 by a conventional pumping unit at the surface of the earth.
Oil then ?ows from reservoir 12 through perforations 14
and into casing 10 below annulus packer 52. The oil then
?ows into working barrel 20 through passage 34 and check
valve 35. On the down stroke of piston 22 oil ?ows up
Suspended within casing 10 is tubing 16. Tubing 16
extends from the surface of the earth to near the bottom 50 wardly through passage 28 through check valve 30 and
into the space above piston 22 in working barrel 20. On
of casing 10 or below the liquid level of the oil in casing
the upstroke of piston 22, oil above piston 22 is forced
10 to be pumped to the surface.
'
through passageway 50 and check valve 49 and thence up
A string of hollow sucker rods 18 is suspended within
the annulus between tubing 16 and casing 10 to the sur
tubing 16. Conventional pumping equipment (not
face of the earth.
shown) at the surface of the earth is provided to recipro 55
It is thus clear that at least partial ?otation of the hol
cate sucker rods 18 in the tubing.
low sucker rod is effected, and that the use of a high spe
Suspended at the lower end of tubing 16 is working
ci?c gravity ?uid increasesvv the effect of ?otation. There
barrel 20. Adapted to reciprocate within working barrel
fore, the use of a hollow sucker rod system of this inven
20 is piston 22 which is provided with upper piston ring
24 and lower piston ring 26. Within piston 22 is passage 60 tion permits the setting of and use of larger pumps at
greater depths than is possible with conventional sucker
28 having check valve 30 which is of a character to pre
rods.
vent the downward flow of ?uid through passage 28. The
The use of this invention materially reduces the weight
lower end of working barrel 20 is enclosed by plate 32.
on the sucker rods and permits‘ longer sucker rods to be
Bottom plate 32 of working barrel 20 has passage 34
with check valve 36 which is of a character to permit oil 65 used without breaking than. ordinarily has been possible;
and ‘as the sucker rods do not have to support much of
to ?ow from the casing into the working barrel but pre
illustrated as set in the top portion of producing reservoir
12. Casing 10 has perforations 14 so that oil may ?ow
from the reservoir 12 into the interior of casing 10.
their own weight as in other systems more of the strength
of the rod can be used for transmitting‘power for, driving
In a preferred embodiment hollow sucker rod 18 has
a pump in the bottom of the borehole.
_
a connecting member 38 attachable to piston 22 by a lock
70
As
an
example
of
the
buoyancy
effect
of
this
system,
a
nut 23. Member 38 is preferably solid and has a re
steel rod of 31/8 inch diameter having a 0.150 inch wall
duced cross section from that of hollow rod 1-8. A pack
is considered in connection with a liquidhaving a speci?c
vents oil ?owing downwardly through passage 34.
3,040,673
4
gravity of about 1.30 in tubing 16. It can be readily cal
culated that buoyancy will support 91% of the weight of
the rod thus leaving only 9% to be supported at the top.
The stretch of the sucker rod due to its own weight is
What is claimed is:
1. A well pumping apparatus comprising a combina
tion of a string of tubing, means forming an elongated
reservoir in said tubing, a string of hollow sucker rods re
likewise reduced. The design of a hollow rod for a par
ticular job will depend upon many factors such as the
depth from which fluid is to be pumped, the rate'of pump
said reservoir, a high density liquid in said reservoir to
put buoyancy upon said rods, pumping means recipro-v
cable by said hollow sucker rods to pump ?uid upwardly
ing, the nature of the ?uid to be produced and the density
of the liquid.
,
ciprocably and sealingly extending longitudinally through
from the bottom of the well exterior of said tubing to _
I
of the earth.
FIG. 3 illustrates another embodiment of the invention 1O the2.surface
A pumping apparatus for removing oil from a well
using a full-opening retrievable pump unit. Parts in FIG.
comprising a casing in said well, a tubing string suspended
3 which are identical to parts in FIG. 1 will be given the
within said casing, a hollow rod suspended'reciprocally in
same reference numerals. The illustrated full-opening re
said tubing, packing means disposed in the lower part of
trievable pump unit includes the pump barrel 56 mounted
said tubing sealingly engaging the inner wall of said tubing
in the lower end of tubing 57. This is held in place by 15 and slidably andsealingly engaging said rod, an annulus
a bottom lock holddown means including an expanding
nose 58 and a receiving recess 60' in the lower interior of
tubing 57. For a description of an .API bottom lock
holddown, reference is made to Continental-Emsco Com
pany illustrations on page 1421, volume I of the 23d
(1958-1959) revision of the composite catalog published
by World Oil, PO. Box 2608, Houston, Texas. A pump
piston 62 is attached to connecting member 3-8 by lock
packer sealingly engaging said tubing and said casing,
pumping means suspended at the lower end of said tubing
string below said packer and connected'to the lower end
of said rod, and of a character to pump oil from below
said annulus packer to above said annulus packer, and a
liquid within said tubing above said packing means.
3,. An apparatus as de?ned in claim 2 in which the
liquid is a solution of potassium carbonate in water.
nuts 64. The upper end of pump barrel 56 is closed by
4. An apparatus for pumping liquid from a Well com
plug 66 which has an aperture 68 therethrough for the
prising a casing, a tubular member suspended within said
passage of connecting rod 38. Sealing means 70 effects a
casing, a hollow sucker rod reciprocable within said tubu
sliding and sealing relationship between connecting mem—
lar member, means forming a liquid reservoir within said
ber 38 and cap 66. The lower end of pump barrel 56
tubular member and exterior of said rod, an annulus
is enclosed by a lower cap 72 having a passage 74 there
packer between the lower end portion of said tubular
30
through. A check valve 76 is located in passageway 74
member and said casing, pumping means reciprocable by
and permits the flow of ?uid only in an upwardly direc
said rod which sealing'ly extends through the bottom of
tion therethrough.
,
said means for forming a liquid reservoir, said pumping
As shown piston 62 has a passage 78 vertically there
means being further characterized in having its suction
through. Passage 78 has check valve 80 which permits
side below said annulus packer and its discharge side in
35
the flow of ?uid upwardly through passageway 78 but pre
the annulus between said casing and said tubular member
vents its ?owing downwardly therethrough. Packer 52
above said annulus packer, and a liquid within said res
seals the annulus between tubing'57 and casing 10. Ports
ervorr.
82 and 84 in thewalls of pump barrel 56 and tubing 57
5. An apparatus as de?ned in claim 4 in which the
respectively provide ?uid communication between the up
speci?c gravity of the liquid is greater than 1.00.
per interior of pump barrel 56 and the annulus between 40
6. An apparatus of the character described for pump
casing 10 and tubing 57. An internal recess 88 in tubing
ing ?uid from a well bore comprising an elongated reser
57 serves to interconnect ports 82 and 84 so that exact
voir suspended within said well bore, a liquid in said
alignment of the ports is not essential. Sealing means 90
reservoir, a hollow rod reciprocably mounted within the
above ports ‘84 and 82 provide a sealing relationship be
liquid in said reservoir, an extension rod connected to the
tween the upper end of pump barrel 56 and tubing 57.
lower end of the hollow rod and extending in a sealing
Another sealing-means 9-2 provides a-?uid-type seal be
and sliding relationship through the bottom of said res
tween the lower end of pump barrel 56 and tubing 57.
ervoir, said extension rod sealing the lower end of the
In the embodiment shown in FIG. 3 if it is desired to
hollow rod, pumping means supported at and from the
remove pump barrel 56 for any reason such as repair of
lower end of said reservoir including a piston mounted in
check valve, seals, etc., it is seen that the pump barrel 56 50 said pumping means connected to and motivated by the
may be removed therefrom without removing or pulling
reciprocation of said rods and conduit means from the dis
tubing string 57. An upward pull on tubing 18 while tub
charge side of said pumping means extending to the sur
ing 57 is held stationary results in piston 62 being pulled
face of the earth.
upwardly against plug 66. Further upward movement
7. An apparatus as de?ned in claim 6 in which the
of pump rods 18‘ causes expanding nose 58 to be com
liquid is a solution of potassium carbonate and water.
pressed and move out of recess 60. The pumping unit
References ‘Cited in the ?le of this patent
then may be pulled to the surface for repairs.
It will be noted that the foregoing description is con
UNITED STATES PATENTS
cerned with two structural embodiments of the invention.
It is possible to produce still other embodiments without 60
departing from the inventive concept herein disclosed, and
it is desired therefore that only such limitation be im
posed on the impending claims as are stated therein.
1,900,588
1,906,933‘
2,051,089
Scott __-____ ______ __'_____ Mar.'7, 1933
Standlee- _____________ _.._ May 2, 1933
Lamb ______________ __ Aug. 18, 1936
2,797,642
Bloudoff' _____________ __ July 2, 1957
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