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Патент USA US2134465

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0er. v25, A193.3.
Filed sem.. i510, 1956V
246 ï"
.2 sheèt-s-sneet 1
Oct. 25, 1938.
2,134,465 I
Filed septl. so. 193e
7i 55-
35 '
3 ’«
? 96“
2 shee'tsèsneet 2
James E. Lac
Hi ioz'neys.
Patented Oct. 25, 1938
James E. Lacy, Los Angeles, Calif., assigner of
one-half to Richard H. Lacy, San Marino,
« -Application September 30, 1936, Serial No. 103,338
. '7 Claims.
(Cl. 10S-46)
My invention relates to a deep Well pump such - as the piston for ‘the compressedair engine and
as a pump suitable for pumping- oilxfrom bored
wells ,or for pumping water or water with min
erals in solution fromv considerable depths fbelow
5 the surface of the earth.
An object and feature of my invention is to
as the plunger fc r the oil pump.
Another detail feature of my invention is in
controlling the _air valves by a cam which posi
tively rotates the valves a suñ‘icient amount to
open the air valve for admitting air to the air
use compressed -air as the motive force for pump . engine on the power stroke and giving a reverse
ing the oil or other liquid and in which the pump motion for exhaust.- The cam for operating the
assembly is located at the desired depth in the
well for receiving the oil or other liquid, which
rotary valve is preferably actuated by a recipro-`
eating cross-head having a cam mounted there- 10
liquid is positively elevated by a plunger pump,
the .plunger being operated by an air engine
o`n, which cross-head is positively depressed by
~ pumps and thus positively elevates the oil to a
suflicient air to lift a heavy load 'of oll or other
the weight of oil above the pump. -To effect this
having a cylinder and a piston. An advantage of operation a small duct communicates with the
my construction is that the only moving partsl oil in the oil tubing above the pump and leads` 5
are the piston of the air motor and the plunger to a small diameter but elongated cylinder hav
of the oil pump together with the actuation of ing a piston with a connecting rod therein, the
the control valves.> Hence there are no long rod operating the cross-head. Another feature
reciprocating partssuch as the sucker rods in of my invention relates to a construction of the
the ordinary pumps leadingl down into' the well. air engine by providing a plurality of compara
tively small air valves connected with the com- 0
20 ‘ Another general‘object 'and feature of my in
vention is pumping the oil or other liquid from pressed air line through the medium of a mani
deep'wells' in stages. That is, the lowermost fold.> By this construction comparatively small
pump is located at the bottom of the well which air valves can be utilized to admit and exhaust
25 higher elevation-where it flows into a sealed-off
chamber in the well in which the next higher
pump is located, the oil being pumped upwardly
through a string of oil pipe. Thus by having a
succession >of pumps.. eachw of which is operated
30 by compressed air, the oil maybe elevatedby
stages from the bottom to the top of the well. A
further feature of my invention resides in using
separate air conduits or pipes connecting from
vthe top of the well and an air compressor plant
35 to the individual pumps. Thus by using a proper
timing arrangement the pumps can be operated.
in a sequence, hence as only a comparatively
small amount of compressed air is required for
any one pump, it is not necessary to have a very
40 large Aor expensive compressor plant, although
of course it is desirable to use the air lat high
pressure in the individual pumps. 1
Another object and feature of my invention
is in arranging the pumps and their construc
45 tion suitable for use in a well in which the cas
ing tapers in stages from the top to the bottom
of the well, being smallest at the bottom. Hence
as it is desirable to have as large a diameter oil
pipe as possible, the lowermost pump may have
the pump plunger and the piston of the air
- motor or engine substantially the full diameter
of the oil pipe or tube. In this case the cylinder
_in which the piston operates for the air engine
also functions as a cylinder for use in pumping
55 the oil. In fact, the piston may function bothv
liquid. .
My invention is illustrated in connection with
the accompanying drawings, in which:
Fig. 1 is a vertical section through a well cas
ingfwith the pump assemblies in elevation. In
actual practice, however, each pump assembly
may be much longer in its relation to its diam
eter and the diameter of the casing and the oil
Fig. 2 is a vertical section taken on the line
2--2 of Fig. 8 of a form of pump suitable for a
small diameter well casing. In thisl instance
the pump barrel is the same or substantially the
same diameter as the oil pipe through which the
oil is pumped upwardly.
Fig. 3 is a verticalsection taken substantially
on the section lines 3-3 of Figs. 4, 5, and 6 show
ing a construction of pump suitable for the upper
stages in pumping where the >well casing is of
larger diameter and the pump barrel of greater 4
. diameter than the oil pipe.
Fig. `4 is a horizontal section on the line 4-4
of Fig. 3" looking upwardly in thel direction of
the arrows. »
Fig. 5 is a horizontal section on the line 5--5
of Fig. 3 looking downwardly in the direction of
the arrows.
Fig. 6 is a horizontal section on the line 6--6
of Fig. 3 looking downwardly in the direction
of the arrows.
Fig. '7 is a horizontal section on the line 1-1
of Fig. 3 looking downwardly in the direction ' long arms secured to the rods 54. A circular oil
of the arrows, this ñgure being on a smaller scale
manifold 58 is located above the upper head 23
than Figs. 4, 5, and 6.
and supplied by oil by a small bore oil pipe 58
Fig. 8 is a horizontal section on the line 8_8 ' extending upwardly along the oil cylinder v28 and
of Fig. 2 looking downwardly in the direction of
being connected as indicated at 68 to the upper
part of the cylinder 28 above the ilap check valve
Fig. 9 is a detail perspective partly broken. 6I, this being pivoted at 62. A radial oil lead
away of one of the air control valves.
l63 extends from the manifold to the upper
Referring first to Fig. l, the oil well casing pipe
end of each of the small bore pipes 5,8 (note Figs.
10 indicated by the numeral || has a lower section
3 and 7). 'I'he inlet for oil to the- oil pump is
I2 with the perforations I3 for the inflow of oil through the inlet elbow pipe 64 (note Fig. 3),
or other liquid, this being at the bottom of the this having a check valve 65 therein, such valve
well and is usually of much smaller diameter~ being operative for inñow of oil from the oil
than for instance, an upper vsection I4. There
15 fore when pumping is done in stages it is> usually chamber 43 surroundingÍ the pump to the oil
cylinder~ 29 but preventing outñow on the up
impractical to have a large~diameter pump at
stroke. The small oil vent 66 is provided in the
the bottom oi a well. The lowermost pump is head 23 for inflow and ejection of oil above the
indicated by the numeral |5 and is shown in plunger 24 during the reciprocating motion of
detail in Figs. 2 and 8, using however the valve this plunger under the action of compressed air.
20 construction of Fig. 9. An upper or larger diam
The air supply and control assembly designated
eter pump is indicated by the numeral I8 and by the numeral 15 includes _a plurality of indi 20
illustrated particularly in Figs. 3 through 'l vidual air valves 16, th ee of these being illus
having the valve of Fig. 9.
the arrows on the same scale as Fig.> 2.
The upper type of pump is constructed sub
stantially as follows, having reference particu
larly to Figs. 3 through 7 and 9. An outer cyl-v
inder or case 28 encloses the cylindrical motor
barrel 2| which barrel has a lower head 22 and
an upper head 23, preferably connected thereto
The motor plunger
or piston 24 is slidably mounted in the barrel and
has a central rod 25 which extends downwardly
through a guide opening 26 in the lower head 22.
A'piston rod 21 also connected to the plunger 24
extends upwardly through a guide opening 28 in
30 by a threaded connection.
the upper head 23.@ To this upper head is con
nected an oil pump cylinder 28 having the oil
pumping piston 38.mounted~ on. the upper end of
the piston rod and working in this cylinder. The
40 upper or smallv diameter string of oil pipe 3| con
nects to the oil pump cylinder 28 and extends up
wardly in the well.
' 4
The lower end of the cylindrical case 28 is pro
vided with an end head 35 with a guide opening
This is
preferably screw threaded into the lower end of
trated, the details bein presented in Figs. 3,'4, 5
and 9. Each valve has 'a cylindrical valve casing
1.1 extending downwardly from the lower head 22 25
which head has an inlet port 18 and an outlet
port 19, these being arranged concentric with the
axis of the rotary cylindrical valve plug 88. Such
plug has right angular inlet air passage 8| and a
longitudinal outlet air passage 82 (note particu 30
larly Figs. 3 and 9), the inlet` passage being of
larger diameter than the outlet passage. Air is
supplied through a circular air manifold 83 lo
cated below the head 22 and connected to open
ings 84 through the valve casing 11. A vertical 35
air compressed pipe 85 has a. connection’to the
manifold 83 and passes upwardly in the annular
space 5| between the cylindrical case 28, and the
motor barrel 2|, this having an upward lead L86
with couplings 81 following upwardly on the oilv 40
pipe string to the top of the well where such
pipe is connected to a suitableair compressor or
a controlled storage tank of compressed air.
'I'he actuating mechanism for the valves desig
nated by the assembly numeral 88 employs tubes 45
8|, each connected at its upper end to a valve
the cylinder. This cylinder 20 terminates at the plug 88, the outlet passage 82 discharging down
bottom in a reduction head 31 having va ilange 38 v wardly through the pipe 8|. Each pipe has a
to which the lower string of oil tubing 38 is -con
reduced journal end 82 connected to its lower
50 nected, this leading upwardly from the lower
end, this having a bearing 83 in the head 35 50
pump I5. Thus there is an oil chamber 48 pro
adjacent the lower end of the cylindrical case 28,
vided below the head 35 and havingoil flow open
there being a central air discharge perforation 84
ings 4|. An annular packer 42 of any suitable through the head 35 and the journal end 82.
type seals off the lower portion ofthe pump I6 -The pipe. 8| is provided with an upper radially
55 with the well casing, the packer being below the
projecting pin-85 and a lower radially projecting
openings or perforations 4| to allow upflow of oil pin 86, these being at 88 degrees to each other. 55
into an upper annular oil chamber 43 between the The cross head carries three cams, each indi
cylindrical case 28 of the pump I6 and the well cated by the numeral 100 and secured to the
45 36 for the rod 25 and perforations 35'.
A series of small oil reaction cylinders 58, these
being shown as three in number as indicated in.
Fig. 6, extend downwardly in the annular space
5I between the casing cylinder 28 and the motor
barrel 2|.' 'I'hese preferably have a snug ñt and
65 by means of welded iillets 52 properly center and
retain the motor cylinder mounted in a concen
tric and fixed position in reference to'. the cylinder
case 28. In each of these small pipes or cylinders
there is mounted a piston 53 with a downwardly
70 extending4 piston rod 54, this being connected to
a cross-head 55. The cross head is shown in
Figs. 4 and 5 as a series of radial arms 56 leading
from a central hub 51 through which hub the rod
25 passes, the hub being rigidly secured to the
75 rod. The cross-head is shown as having three
cross head hub 51 by short arms |8| (note Figs.
3, 4 and 5). ~Each of these cams has an upwardly 60
sloping face |82 and a lower sloping face |83 so
that on the. upward movement of the cross-head
55 l'when the pump plunger 24 moves up, the
face |82 engages >the upper pin 85 and causes a
rotation of the valve plug in one direction. Like
wise when the cross-head moves downwardly
due to its rigid attachment to the rod 25 and the
lower face |83 engages the pin 86, the tube >8|
and the valve plug 88 is rotated in the opposite
It will be apparent that instead of having the
cylindrical case 28 and the motor." barrel 2|
formed as two separate elements with an annular
space 5| therebetween, these can be made inte
gral with longitudinal bores forming a provision 75
for the small reaction cylinders 50 and for the
compressed air duct 85, as it is not really essential
` that there’be an annular space such as 5|.
in some cases where there is sufficient diameter
in the well casing to have relatively large valves,
one air valve may be utilized instead of a plu
rality of smaller valves. Also in some cases in
stead of >having the reaction pistons 53 to effect
the' positive downward movement of the cross
10 head and'hence of the cams |00, the weight of
the outlet passage 82 ñows downwardly throughl
the pipe 9|, the discharge perforation 94, into the
oil chamber 40 and hence outwardly through the
oil flow openings' 4| or the perforations 35 and
thus mingles with the oil conñnedin the well cas
ing flowing upwardly through this oil and eventu
ally being discharged from the top of the well.
It will be apparent that the motor-barrel and the
length of stroke provided for the cross-head 55
may be as long as desired to give a considerable 10
lift at each stroke to' a comparatively small vol
ume of oil, the volume being regulated by the dl
ameter of the oil cylinder 29 and the length of
the stroke of the oil piston 30. Inthis arrange
ment the air is always under constant compres
the plunger 24 or weights attached to the rod 25
may be suflicient for this purpose. It will be
noted that the small pistons 53 are always subject
to the hydraulic head due to the weight of oil or
15 other liquid above the flap valve 8| to the upper i sion in the air pipes 86 and 35, supplying air to
end of the particular length of oil pipe 3|'.
the valves, -hence the rapidity of the stroke is
dependent on the air pressure,lthe weight of the
trated particularly in -Figs. 3 to '7 and 9, is sub- ' column of oil being elevated and the speed with 20
which the plunger 24 descends.
20 stantially as follows: Presuming the plunger 24
The type of pump such as I5 for use in they
is at the bottom of its stroke adjacent the lower
a well where the diameter of,
head 22 of the motor barrel, then the cross head
55 is at the lower part of its stroke and the lower the casing is not suflicient to accommodate the
face |03 of the cam |00 engages the pin 96 of larger pump such as designated at I6, is’ con 25
structed substantially as follows, having refer
25 the tube 9|, thus rotating and positioning the ence particularly to Figs. 2, 8 and 9. This in its
valve plug 80 to align the inlet passage 8| with
main feature's is the same as the pump I5 above the air openings 84 to the manifold to allow com
pressed air to enter through the inlet port 18 described. An elongated cylindrical case |25
has a lower perforated head |26 with perforations
in the head 22, this compressed air as above men
|21 and a central guide opening |28, which head 30
30 tioned, .being fed downwardly through the air may be threaded intothe lower end of this cylin
pipe 86 and 85 and the manifold 83. As the pis
concentrically mounted in the case as a corn-`
ton rod 21 is carried downwardly by the plunger der
compressed air and oil lift cylinder |30,
24, the oil piston 30 is likewise lowered causing an bination
the lower end |3| of which is4 provided for the
inflow of oil from the annular space between the compressed air and the upper portion I 3|’ for 35
35 well casing and the pump through the -inlet 64
oil to be lifted. A combination air plunger
having the check valve 65. In this action the the
and _oil piston |32 is mounted in the cylinder |30
downflow of oil retained in the upper part of the and has a rod |33 extending downwardly through
cylinder and the oil pipe 3| is prevented by the a guide opening |34 in the lower head |35 of the
flap valve 6|. The compressed air below the cylinder |30. This rod _extends downwardly 40
40 plunger 24 gives an upward stroke to its plunger, through the guide opening |28. There are small
which' it will be noted, is of very much larger area
tubes |36 forming oil cylinders located be- '
than the oil piston 30. This creates a lift of bore
the case |25 and cylinder |30 and having
the oil in the oil pump cylinder 29 closing the
check valve 65 and opening the flap valve 6I for the function of the reaction cylinders 50, each
The manner of operation and functioning of
the pump assembly designated as l0 and illus
being provided with a plunger |31 and a rod |38 45
extending downwardly and connected to a cross
elevating the cams |00 and also by means of the _ head |39. This cross head is similar to the cross
rods 5,4, thrusting the small pistons 53 upwardly. head 55 and secured to the rod |33.` IThe cross
-Any oil which has entered through the vent 66 head is provided with cams |00 and operates the
same type of valve indicated at 15 as shown in 50
above the plunger 24 in the motor barrel is ex
connection with the pump of Fig. 3. In this case
pelled through this vent. When the upper slop
ing surface |02 ofthe cam |00 engages the upper however, the tubes |40 extend downwardly from ~
pin 95 o'n the tube 9| it rotates the pin and the the Valve plug having a perforated lower bearing '
tube and hence the valve plug 80 one-quarter |4| in the lower head |26, the exhaust air being
discharged downwardly through these pipes |40. 55
55 turn, thus dis-aligning the intake passage 8| with It will be noted in the construction of the valve
the intake port 19 and bringing the outlet air
45 upflow of oil in the oil pipe 3|. «At the same time
the rod 25 carries the cross head 55 upwardly
passage ,82' in the plug into alignment with the
outletl port 19. This releases the air pressure in
the motor barrel below the plunger 24 allowing
60 this to descend.
As the small pistons 53 are al
Ways subject to the hydraulic head of the oil in
the manifold 58, the small bore pipe 59 and the
` `oil string 3|', these pistons are positively forced
downwardly when there is no air pressure to
65 cause their elevation.
Thus even if there is a
resistance to the outflow of. air from below the
plunger‘24, the cross-head 55 positively exerts
a downward pull on the rod 25 and hencei‘orrthe
plunger. The first action of the downward move
70 ment of the piston 30 is to cause a closing of ñap
-valve 6|, thus trapping the oil above such valve.
However as above described, in certain cases the
small pistons 53 with the rods 54, the oil duct 59
andthe manifold 58, may be discarded. The
75 exhaust air as above described as passing through
of Figs. 2 and 8 that the cylinderv|3g0 is of the
same diameter as the oil tubing 39 through which
the oil is vpumped upwardly. An oil inlet |42 hav
ing a check valve is provided and located below 60
the pivoted flap valve |43. A small bore oil duct
|44 connects to the cylinder |30 on the oil tubing
39 above the l'lap valve |43 and connects to an
annular manifold |45 (note (Fig. 8), this having
connections |46`to each. of the small oil cylinders
|36. . The compressed air is brought downwardly
by a compressed air pipe |41 which leads through
the annular space between the case |25 and the
cylinder |30 and leads to a manifold |48 located .
surrounding the valve assembly 15 and supplies
air to these valves in the same manner as the
similar manifold of the pump of Fig. 3. This
air pipe |41 leads upwardly through the upper
pumps I6 either through the annular ,space 5|.
or through special bores provided. By this con 75
-struction there is a separate air pille supply to
connecting said small piston andthe rod con
each of the pumps when these are arranged in ï nected to the plunger and a liquid connection
The operation of the pump l5 considered as an
'individual pump is substantially the same as thepump of Fig. 3, except in this case the area oi' the
plunger |32 on which the air operates is slightly
less than the upper area lifting the column of
-oil. On account of this lower pump being de
10 signed for use in the lower contracted end of the
well casing 'where the oil ilows in through- the
perforated casingvfrom the oil sand, it is desirable
that this type of pump have a greater lift than
the pump of Fig. 3.
'I‘he operation 'of an assembly of pumps for
lifting the oil in stages is as follows, having ref
erence particularly to Fig. 1: The pump I5 is
operated by its own air line and lifts the oil
through the lower string of oil tubing 39 which
20 is‘ connected as shown in Fig. 3 to the lower
end of the cylindrical case‘ 2q of the larger
pump I6 next thereabove. The oil is discharged
into _the oil chamber 40 and ilows `outwardly
through the ports or perforations Il in the cyl
25 inder 20 (note Fig. 3) into the annular chamber
43 deiined by the packer 42, the upper section
from theV small bore cylinder above its piston to
the liquid in the liquid tube.
2. In a deep well pump in which a well bore
is provided with a well casing, a gas motor fitted
in the casing, a liquid pump connected there
5 ,
to. a , gas supply pipe for the motor and a
liquid pipe connecting from said pump upward
ly in the well,-the motor having a movable ele
ment combined with a return mechanism for
the moving element of the motor having a liquid
pressure connection to the liquid in thel said
liquid pipe> to positively return the moving ele
ment of the pump to its initial position.
3. In a deep well pump in which a well bore
is provided with a well casing, a gas motor hav
ing a reciprocating piston and ailiquid pump
also having a reciprocating piston, the pistons
being connected, al gas supply pipe for the motor 20
leading upwardly in the well, a liquid discharge
pipe from the pump extending upwardly in the
well combined with aireturn mechanismv for the
piston of theA pump having a liquid connection
to the liquid in the liquid pipe constructed and 25
adapted to maintain a liquid pressure due to
Il of the well casing and the cylindrical case the head _'of liquid in the pipe with means
20, the oil being always maintained at a level A urging the motor piston downwardly, the pres
well above the oil intake 64. Therefore the
30 upper pump I6 operating on its own air system vsure of the gas being adapted to overcome the
downward u'rge on the pumping stroke of the 30
gives the oil a lift in the second stage upwardly motor and the pump.
through the string of oil pipe 3|. This in its
4_. In a deep well pump as claimed in claim 3,
turn may be connected to a similar pump much the liquid return mechanism including one or
in the same manner as the oil tubing 39 is con
35 nected‘to the pipe i6. Thus by having a series more small- bore cyinders each with a piston
therein with a liquid connection from the cyl 35
of ` pumps which may increase in size as de~
inder or cylinders to the discharge liquid pipe
sired as the well casing increases in diameter together with means connecting the small pis
towards the top of the well, the oil may be ton or pistons to the piston of the gas motor.
pumped in succeeding stages from the bottom
.5. In a deep well’pump, the combination of
40 to the top of the well for discharge in the usual
a cylindrical case having a iìrst cylinder for air- 40
manner. In order to economize on the size of mounted concentrically therein, said cylinder
the air compressor plant, this may be arranged having av lowe'r head with a guide opening, the
-to form a connection to the various air supply said case having a lower head with a `second
lines for the diñ’erent pumps in a sequence so
45 that one pump actuates on its lift at a time and
it is not necessary to supply at one time enough
guide opening, a plunger mounted in the iirst
cylinder and having-a‘road extending through
the guide openings in the head of the cylinder 45
air to operate all of the pumps simultaneously. and the lower head of the case, the lower head
It will be apparent however, if desired, that all )of the cylinder having inlet and exhaust ports,
of the pumps may be connected to the same air
50 line, in which case it will be only necessary to
run one line of air pipe from the surface to the
ground to the lowermost pump, this being tapped
off to the manifolds of the various pumps used
a valve having a rotary plug with inlet and ex
haust passages, a compressed air connection
from the said valve to the top of the well, a re 50
ciprocating actuating means for the valve con
nected to the said road and a valve moving de
vice connected to the valve plug to be engaged
Various changes may be made in the details by the said ‘actuating means to operate the said
ofthe construction without departing from ,the valve to align the said passage respectively with 55
l spirit or scope oi' the invention as defined by the-> the said ports, and a liquid cylinder connected
appended claims.
to the first cylinder having the valve, said liquid
I claim:
cylinder having a piston connected to the plung
1. In a deep well pump, the combination o1' er, a liquid tube extending Iupwardly from the
in the stages above the lowermost.
an outer case structure, a combined air and _ liquid cylinder and having a check valve there
liquid cylinder havi-ng a plunger therein with a in and an intake for liquid with a second check
rod connected to the- plunger, aA liquid tube con - valve below the ñrst check valve, the rod having
nected to the upper end of the liquid cylinder a cross-head connected thereto, a small bore cyl-v
65 and having a check valve with an inlet there
inder positioned between the case and the first
cylinder and having a small piston therein with 65
below, a valve for the air cylinder, a com
pressed air connection from the top of the well a piston rod connected to the said cross-head, a
to the said valve, a valve operating means hav
liquid connection from thef upper end of the
ing a movable element connected to the said small cylinder above its piston to the liquid tube
rod, with valve rotating elements operatively above the check valve ot said tube whereby the
positioned to be engaged thereby, the >valve hav
small piston is always subject to the hydraulic 70
ing an inlet and an exhausty passage for air, a." head of the liquid contained in the said liquid .
means to positively move the plunger down
tube for returning the cross-head and the said
wardly comprising a small bore cylinder having
a small piston -therein with an Operative means
plunger to its lowermost position after a lifting
6. In a deep well pump, an air motor cylinder
having a head at the bottom with a guide open
ing therethrough, a plurality of air valves mount
ed on the lower head and having inlet and ex
haustv passages, an air manifold having a con
nection to the inlet passages, a compressed air
connection from the manifold to the upper part
of the well, a motor pump plunger in the cylin
der having a rod extending downwardly through
10 the guide opening in the head, a valve actuating
the small pistons are always subjectto the hy
draulic head of the liquid in the liquid tube.
7. In a deep well pump acompressed gas mo
tor and an oil pump connected together, the mo
tor having a cylinder with a piston operating
therein and the pump having a cylinder with a '
pump piston operating therein, the said pistons
being connected together, an oil inlet to the oil
pump above the level of the uppermost travel of
the pump piston, a valve connected to the lower 10
end of the motor cylinder, a conduit for com
means having a portion thereof secured to said
rod to reciprocate therewith to actuate the valves pressed gas extending downwardly and connected
to the valve, a cross-head connected to the pis
simultaneously from an inlet to an exhaust posi
tion, a liquid pump having a cylinder connected . ton of the motor, a cam on said cross-head and
an interacting means between the cam and the 15
to the cylinder of the air motor with a piston valve
to rotate the valve, such valve having an
connected to the plunger, a liquid inlet above exhaust opening communicating with the well,
the piston, a check valve above the inlet and a a small bore cylinder positioned adjacent the
liquid tube extending upwardly from the liquid motor cylinder having a small piston therein,
pump cylinder, _the valve actuating means in-Í an oil connection from the upper end of the 20
cluding a' cross-head, a plurality of small liquid -cylinder to a position above a check valve of the
cylinders connected to the air pump cylinder and oil pump to always maintain an oil pressure on
each having a small piston, secondary piston rods the piston of the small cylinder-and a rod con
between each small piston and cross-head, a
liquid manifold vconnected to the upper end of
each of the small cylinders, a liquid connection
necting the small piston with a cross-head where
by the small piston and said rod always exerts a 25
from Vsaid manifold to the liquid pump cylinder
above the check valve of said cylinder whereby
hence on the motor piston.
downward movement in the cross-head and
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