US2081223A - Fluid operated deep well pump - Google Patents

Description

5 sheets-shea 1 5 a. 535 5459/2. y, @www5/www wb2# w mm mnw m. /f f2 u Rm V2M A NC JM R A a y A TTORNE' x C. J. COBERLY FLUID OPERATED DEEP WELL PUMP Filed April ll, 1934.

May 25, 1937.`

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May 25, 1937. c. .1. coBERLY 2,081,223

FLUID OPERATED DEEP WELL PUMP Filed April ll, 1954 5 Sheets-Shea?l 2 [/V vf/v ron.- CLARE/VCE d (06E/QL ATTO/www May 25, 1937. c. .1 -c;oBERLYl FLUID OPERATED DEEP WELL PUMP Filed April 1l, 1934 5 Sheets-Sheet 3 f/v VENTO/e.- i

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'May 25, 1937. l c. J. COBERLY FLUID OPERATED DEEP WELL PUMP Filed April 1l. 1934 5 Sharps-Shea?l 4- ]/v vf/vroR CLARE/VCE (j (06E/uy,

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May 25, l1937. c. 1. coBERLY 2,081,223

FLUID OPERATED DEEP WELL PUMP Filed April 11, 1934. 5 sheets-sheet Tf/,21 Ew? 22.

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1.1mm) oPEnA'rnnnEar wam. Pour u u ,l Clarence J. Coberly,'InsfAngeles, Calif.,-ascignor to RoKo Corporation, tion oi' Nevada I Reno, Nev., a. corpora- Applicata; April 11, 1934, serial No. '12041615 v 623,171, led July 18, 19 32, and entitled Liquid operated pump.

'As is well known, 'the pumping of oil wel'lsis accomplished chieiiy through the use of sucker rod pumps which are relatively ine'illcientl especially where oil must be pumped from a considerable depth. The reversal of stresses in vari- A ous parts of sucker rod operated pumps, namely, in the sucker rods and the pump tube, results in many failures 'of parts and necessitates fre-'' quent repairs which are often costly.

.It is an object of my present invention to pro'A vide a pumping 'device' in which the motivating power will be applied continuously and essentially constantly in one direction through a member leading from the top ofthe well to the pumping mechanismdsposed near vthe bottom of the well.4 'I'his uni-directional application of power, applied throughv a flow of fluid, is converted in the pump mechanism to av reciprocating move-- ment which accomplishes -a desired pumpingoi nil from the well.

It is an object of my invention to provide a pump structure having a iiuid operated motor Y and a. pumpingv mechanism, which pump structure `is composed of relatively simple and durable parts secured together inl cooperating relatonso as to occupy aslender A"cylindrical space.V 4The pump structure',therefore,` although it may .have a reasonably large capacity, Vmay be" in? stalled 'in a minimum vsize oi' 'pipe' at thelower` eudora deep well.I The, conditions encountered in' thefdrilling o'fwells result inlthe necessity for progressivelykreducing ,the `gcf 'the 4casing within the well as L the well increases inv depth, itljeresult` being that 'it is sbmetimes found neces' my@ www init thebotwmrof weep wen casingl pipe "2%'1 lin "diameterfr fsrrlalller object of my1invgarlialon` is provlief in ypuniti,structure bf' vthe 4above character jnove'lg yprtsvrhich are secured together; in a novel I nei', "such parts in" na jrelatively simple manner i i'rning intake' and di s`ch`slv`.`rge` passages which; undejrf ordinary.) vrinciplesffgf feesten# een l maimed :fenetre: bfrfemtivlrmme site' withuta 'scicefdfplysical strength.- 55 my invention ample strength for practical oper.y

Y its uid ports and passagers.v

.of the pump.

14 claims. (01.10946) ation of the pumping device is preserved through- Vout the various cooperating parts thereof.

In the pumping o! oil from wells, gas pockets sometimes form so as to be drawn into the pumping cylinder, thereby relieving the pumping load 5 as long as the gas is present in the pumping cylinder. `In my present invention I provide a means for practically eliminating injury to the pump structure due to the entrance of gas'into the pumping'cylinder. In ordinary typesof piston pumps, the entrance of gas into the pumping cylinder often results in the hammering of re' ciprocating parts against the end Walls of the ,cooperating parts in which they move. In my present invention the power cylinder is provided l5 with dashpots at the ends thereof for receiving the impact-of the power piston so that in event gas should pass into the pumping cylinder so as to relieve the pumping load, the pistons will not strike-'the ends of the cylinder in which they operate and accordingly will not be upset or in- 20 jured by. hammering action resulting from the entry oi.' gas into the pumping cylinder.

A vfurther object of the invention is to provide a. simple and eective means for controlling the acceleration and deceleration ofthe pistons, this effect being contributed to by the dashpots hereinabove referred to and also by the control of fluid pressure by the slide valve, its characteristie movement, Aand. the characteristic form of Further objects and advantages of the inven' tionV will bemade evident throughout the fol-- lowing part of the specication.

1 l Referring to the drawings, which `are for illustrative purposes only,

vFig. 1 isla vertically sectioned view showing the upper endof a fluid operated pump embodying-myinvenizlo'n.y u

Fig- 2 is a vertically sectioned view complementary to j li'igl4 1, showing the' central section.

Eig. 3ds a vertically sectioned view comple' nientary to Fia-"2, showingv the lower end section,

lng. 51j' yist vrligplitly *enlngdzross section] qu 45 a plane representedxby the'line #-4 of F1831.

represented by the 8-0 ofFig.

Fig. 9 is a cross section on a plane represented bythe line 8--8 of Fig. 1.

Fig. 10 is an enlarged cross section on a plane represented by the line Iiii8 of Fig. 1.

Fig. 11 is an enlarged cross section on a plane represented by the line Ii-ii of Fig. 1.

Fig. 12 is an enlarged cross section on a plane represented by the line |2-l2 of Fig. 1.

Fig. 13 is a fragmentary. section on a vertical plane taken as indicated by the line i3 of Fig. 11.

Fig. 14 is a vertically sectioned view corresponding to Fig. l but showing the valve member thereof in raised position and the pilot member in lowered position.

Fig. 15 is a vertically sectioned view showing the motor piston of the invention in the lowered position thereof when the pilot rod is likewise in lowered position as shown in Fig. 14.

Fig. 16 is a sectional viewA taken on the line -i8--I8 of Fig. 2.

Fig. 17 is a sectional view taken on the line |1-i1 of Fig. 2.

Fig. 18 is a sectional viewI taken on the line |8--I8 of Fig. 2.

Fig. 19 is a sectional view taken on the une ls-ls ofFig. 3.

Fig. 2O is a sectional view taken on the 'line' 28-20 of Fig. 3.

Fig. 21 is a diagrammatic view of the pump structure with the movable parts thereof in raised position.

Fig. 22 is a diagrammatic view similar to Fig. 21 showing the pump with the parts thereof in lowered position.

In the pump structure 24, Figs. 1, 2, and 3, embodying my present invention, I employ an upper fitting 25 by which the pump structure is secured to the lower end of a fluid delivery pipe 28 by which operating fluid under relatively high pressure is delivered to the motor section of the pump structure 24. The fitting 25 has a threaded portion 21 for connection to the upper end of a valve body or valve casing 28. The valve body 28 has an axial minor bore 28 formed in the upper part thereof, which minor bore 28 is separated by a circular channel 38 from a major` bore 3i axially formed in the lower portion of the valve body 28.

Substantially intermediately between the ends of the minor bore 28 is-a circular channel 32 which communicates through ports 33 with the upper ends of primary fluid passages 35 which extend within the wall of the valve body 28 to the lower end thereof. Spaced below the channel 38 in the major bore 3i are a plurality of secondary ports 38 communicating with the upper ends of secondary iiuid passages 31 which are formed within the wall of the valve body 28 and are placed between the passages 35, as shown in Fig. 6. and which secondary passages 31 extend to the low'er end of the valve body 28. As further shown in Fig. 6, the ports 38 constitute circular depressions formed in the inner face of the major bore 3l, preferably by the use of circular milling cutters.

As shown in Fig. 5, and also in Fig. 1, a plurality of discharge ports 33 connect the channel 38 with a channel 38 formed in the outer face of the valve body 28. discharge ychannel or passagev 48 connects between the exterior of the valve body 28 and a small channel 4I formed within the major bore 3i below the ports 38. As shown in Figs. 1,. 8,

.and 13. a passage 42 extends upwardly Ironrthe lower end oi' the valve body 28 in va position between two of the passages 31, as shown by dotted As shown in Figs. 1 and '1, an auxiliary lines in Fig. 7. The passage 42 accordingly is in the same vertical plane as the port 48 but stops below the port 48.- Connecting the upper end of the passage 42 with the exterior of the valve body 28 is a port 43.

To threads 45 formed at the lower end of the valve body 28, a power cylinder 48 is secured, this power cylinder having an axial chamber 41 formed in the upper end thereof for receiving a plug body 48 which is held in fluid-tight engagement with the lower end of the valve body 28 and in fluid-tight engagement with the upper end of a cylinder liner 48 when the power cylinder 48 is connected to the valve body 28 as shown. Mounted in the upper part of the plug 48 is a valve liner 58 having an upper end portion 5i extending upwardly within the major bore 3l of the valve body 28 to a plane disposed a short distance below the ports 38, there being an annular space 52 formed within the major bore 3| around the upper end portion 5I of the valve liner 58. Internally formed intermediate the ends of the upper portion 5I of the valve liner 58 is a channel 53 which communicates with the space 52 through a port 55, and near the lower end of the upper portion 5i is an annular channel 58.

which communicates with the space 52 through a port 51. The parts 53, 55, 58, and 51 are shown in the cross sectional views, Figs. 9 and 10. A shoulder or collar 58 is formed on the valve liner 58 in a position to rest against the upper end of the plug body 48 and to reside within the lower extremity of the major bore 3i. Below the horizontal plane of the collar 58, a channel 58 is formed, which, as shown in Figs. 1, 11, and 13, communicates through a port 88 in the wall of the valve liner 58 and a passage 8l in the plug body 48 with 'a vertical passage 82 which connects with the lower end of the passage 42 formed in the lower portion of the valve body 28, so as to communicate with the exterior of the pump structure through the port 43 disposed at the upper end of the passage 42 as shown in Figs. 8 and 13. To preserve proper alignment of the cooperating passages in the valve body 28 and the plug body 48, a small sleeve 42a is placed in the lower end of the passage 42, as shown in Fig. 13, so as to project into the upper end of the passage 82 of the plug body 48.

Slidable within the valve body 28 is a piston valve 83 which is shown Aagain in Fig. 14. This valve member 83 is of tubular form and has a minor portion 85 which is separated by a radial shoulder'88 from a major portion 81. The minor portion 85 of the .valve member 83 is oi smaller diameter than the major portion 81 and has an external surface 88 which ts the minor bore 28 of the valve body 28 in fluid-tight relation. The major portion 81 of the valve member 83 has an external surface 88 which is slidable within and fits the major bote 3l of the valve body 28 in duid-tight relation. In the upper part of the minor portion 85 of the valve member 83 are primary valve ports 18 which connect the bore 1i of the minor portion 85 with the primary ports 33 at the upper ends of the primary passages 35 when the valve member 83 is in lowered or primary position, as shown in Fig. 14. In the major portion 81 vof the valve member 83 are secondary valve ports 12 which connect the bore 13 of they maior portion 81 with the secondary ports 38 at the upper ends of the secondary passages 31, when the valve member 83 is in raised or secondary position. as shown in Fig. 1. At the lower end of the minor portion 88 of the valve member 63 is a shallow channel 14`which extends circumferentially around the valve member and constitutes a port for connecting the primary passages with the discharge passage or port 38, as shown in Fig. 1, when the valve member 63 is in raised position, and for connecting the secondary passages 31 with the dischargepassage 38, as shown in Fig. 6, when the valve member 63 is in lowered position. Slidable within the bore of the valve liner in fluid-tight relation, and movable within the bore of the valve member 63 in spaced relation thereto, between the raised and lowered positions thereof showny in Figs. land 14, is a pilot rod 16,-the lower end of which is connected to the upper end of a power piston 11 adapted to be reciprocated Within the power cylinder 66'. A cavity 18 formed in the lower end of vthe plug body 48 constitutes a continuation of the bore of the cylinder liner 43, and the portion thereof above ports 19 forms a dashpot 'chamber for holding a body of uid to control the movement of the power piston 'i1 when itis at and near A the upper end of its stroke. The ports 'I9 communicate with vertical passages formed in the wall of the plug body 48 and are so placed as to connect with the lower ends of the primary fluid passages 35 of the valve body 28.

The secondary fluid passages 31, which lead downwardly from the ports 38, connect with fluid passages 8| 4'having the form of grooves in the external face of the plug body 48. The lower end of the power cylinder 48 has threads 82 for connecting it toA an intermediate plug 83 which has an upwardly projecting extension adapted to engage the lower end 86 of the liner 49 in fluid-tight engagement. `In the upper end of the extension 85 a dashpot cavity 81 is formed, the side wall 88 thereof having ports 89 which connect the lower cylinder space with an annular space 9| formed between the extension 85 and the wail 92 of the power cylinder 46, which space 9| is connected to the chamber 41 at the upper end of the cylinder 48 by means of passages 93 which are formed between the cylinder 46 and its liner 49.` i

A piston rod extends downwardly from the power piston 11 through the intermediate plug 83 and a valve structure 96 disposed at the lower Y end thereof into engagement with the upper end of a pumping piston 91 which is reciprocable in a pumping cylinder 98. The pumping cylinder 98 has the same characteristics as the power cylinder 46 in having an upwardly extending wall 99 forming a cavity |00 adjacent the lower end of the intermediate plug 83 to which it is connected by means of threads |0|. The lower 'end of the cylinder 98 comprises a downwardly extending wall |02 which forms a cavity |03 adjacent the upper end of an extension |05 forming a part of a lower plug |06 to which the wall |02 is connected by means of threads |01. By means of threads |08, a fitting |09 is connected to the lower end of the lower plug |06, this tting |09 having a downwardly tapering wall ||0 at the lower end thereof adapted to engage a conical seat formed in a valve insert member ||2 which is supported in a reducing iitting 3 which is connected by means of threads I5 to the -lower end of a string of pipe ||6 which extends to the top of the well and is of such diameter that the pump structure may be lowered thereinto into engagement with the seat member |l2 as shown in Fig. 3. The lower end of the fitting |.|3 is threaded at ||1 to receive an intake member ||8 which serves as a gas anchor.

It will be noted that the pilot rod 16, the power piston 11, the piston rod 95, and pumping piston 91 are allequipped with axial passages I9, which passages ||9 connect with an axial passage |20 extending through a rod |2| which projects downwardly from the pumping piston 91 through the valve structure |22 contained within the cavity |03, and through the lower plug |06 into a tubular member |23 which extends downwardly from the lower plug |06 and has the lower end thereof closed by means of a wall |24. The axial passages i9 conduct the power fluid from the space |33 at the upper end of the pump structure to the interior of the tubular member |23 so that the iiuid pressure against the lower end of the rod i2! will balance the fluid pressure against the upper end of the pilot rod 16. In this manner a/balanced condition of the reciprocating structure of the mechanism is attained. This subject matter is disclosed and claimed in my copending application, Serial No. 623,171, entitled Liquid operated pump, iiled July 18, 1932, to which reference is hereby made.

y Oil from the well, which is to be pumped by the pumping piston 91,passes into the lower end of the pump structure through an opening |25 in the foot tting |09, upwardly through the space within the fitting |09, as indicated by arrows |26, through openings |21 formed within the wall of the lower plug |06 into the annular space |28 formed in the cavity |03 around the valve structure |22, and through passages |29 between the cylinder wall 98 and its liner |30, which passages |29 connect the space |28 with the space |3| in lthe cavity |00 around the valve structure 96.

Each valve structure 96 and |22 includes an annular insert body |32 having three L-shaped passages |33 throughwhich oil may pass from the spaces |20 and |3| and through passages |35 into the upper and lower ends |36 and |31 respectively of pumping cylinderspaces formed within insert bodies |38 which are held against the ends of the liner |30. The inner ends of the passages |33 are normally closed against an outflow of iiuid by check valve balls |39 which are urged against the inner ends of the passages |33 by means of springpressed rings |40. Also formed in. the insert bodies |32 are a plurality of passages |4| which connect the passages |35 with annular spaces |42 formed respectively in the lower and upper ends of the plugs 83 and |06,Athere being passages |43 in the plugs 83 and |06 connecting the spaces |42 with the exterior of the plugs and consequently with the annular space |45 formed around the pump structure 24 within the pipi-.ng ||6. Ac-

cordingly, in the operation of the pump oil isA drawn from the spaces |28 and |3I through the passages |33 into the ends of the pumping cylinder and is forced from the pumping cylinder through the passages |4| and |43 into the space |45 within the piping ||6 which carries the discharge oil to the top of the well. The discharge passage 38, Figs. 1 and' 5, also connects with the space |45 so that the discharge from the power cylinder combines with the pumped oil in the piping I6 and is conducted to the top of the well.

When the valve'member 63 is in raised position as shown in Figs. 1 and 21, operating fluid under high .pressure is delivered through the upper bore of this valve member 63, through the secondary valve port 12 and the ports 36, into the passages v31, from whence it is carried to the lower cylinder space 90 through the passages 8| and 93, the

space 9|, and the ports 89. actuating fluid moves the power piston 11 upwardly. For the purpose of explaining the operation of the valve mechanism, let it be assumed that the power piston 11 in Fig. 21 has just reached its raised position, bringing the pilot rod 16 likewise into raised position and causing a spiral port or passage |46 formed intermediately in the pilot rod 16 to connect the port 60, also shown in Figs. 1, 11, and 13, with the port 51 which leads into the annular space 52 below the piston valve member 63. This will connect the space 52 with the body of fluid existing at low pressure exterior of the pump structure 24 so that fluid under pressure may readily now from the space 52 outwardly through the port 51, downwardly through the spiral passage |46, and outwardly to discharge, as best shown in Fig. 13, through the channel 59 formed within the lower portion of the valve liner 50, the port 60, the passage 6 I, the passage 62, the passage 42, and the discharge passage or port 43 which communicates with the space |45 formed exteriorly of the pump structure 24 by the discharge piping I |6.

'Ihe release of fluid from the annular space 52 in the manner just described permits the pressure of fluid against the upper end of the valve member 63 to move such valve member 63 downwardly toward a lowered position such as shown in Figs. 14 and 22, in which the primary ports 10 will communicate through the ports-33 leading into the upper ends of the primary passages 35, and in which position the shallow channel 14 of the valve member 63 will connect the ports 36 at the upper ends of the secondary passages 31 with the discharge port or passage 38. For producing a slow movement of the valve member 63 as it approaches the end of its downward movement, I provide a means for throttling the discharge of iluid from the space 52 through the port 51. Such means comprises an inner cylindrical wall portion |48 at the lower end of the valve member 63 which will close the port 51 as the valve member 63 approaches close to the end of its downward travel, so that the discharge of fluid from the space 52 will be practically shut off and so that further discharge of uid from the space 52 must take place at reduced speed through a vertical passage |49 in the lower end of the valve member 63 which connects through a shallow annular space |50 in the lower portion of the valve member 63 with a spiral orifice or groove |5| formed in the major portion of the valve member 63 below the secondary ports 12. When the valve member 63 nears the lowered position in which it is shown in Fig. 1, the ports 12 will communicate with the channel 4| formed in the major portion 3| of the bore of the valve body 28, this channel 4| being connected through a passage 40 with the fluid under low or discharge pressure existing in the space |45 around the pump structure 24. Accordingly, fluid may flow slowly outwardly from the lower portion of the annular space 52 and through the flow restricting spiral orice I and the downward movement of the ,valve member 63 may be completed at a reduced rate of speed.

The pilot rod 16 does not start to move downwardly from the raised position in which it is shown in Fig. 21 until the valve member 63 has moved from the position of Fig. 1 to the position of Fig. 22. The reversal of theow of fluid to and from the power cylinder 46 causes the power piston 11 to move downwardly until finally the lower end of its movement is-reached and the pilot rod 16 arrives at v`the position in which it The force of the is shown in Fig. 22, wherein -a spiral port |52 at the upper end of the pilot rod 16 will connect the fluid under high pressure in the upper bore of the valve liner 50 with the port 55 which now, as shown in Figs. 14 and 22, communicates through the shallow annular space |5|) and the passage |49 of the valve member 63 with the lower end of the annular space to introduce fluid under pressure into the lower end of the space 52 and against the lower end of the valve member 63. In view of the fact that the cross sectional area of the lower end of the piston 63 is'greater than the cross sectional area of the upper end 'of the member 63, the fluid operatingV under high pressure in the lower end of the annular space 52 will force the valve member 63 upwardly against the downward pressure of fluid in the space^|53 at the upper end of the valve body 28, and consequently the valve member 63 will move upwardly toward the raised position in which.` it is shown in Figs. 1 and 21. As the valve member approaches the upper end of its movement, the annular wall portion |48 will close the port 55 so that fluid under pressure cannot thereafter enter the space 52 through such port .50 but must travel-downwardly through the spiral orice |5| which is now in such condition near the upper end of the valve liner 50 that itmay receive iluid under'pressure from the space |53 through the bore of the valve member 63. Accordingly, the remainder of the upward movement of the valve member 63 will be controlledto a slow speed by the reduction of the ow of fluid into the space 52 by the spiral orifice |5|. The spiral orifice I 5| communicates With the orifice or discharge passage 40 when the valve member is in lowered position, as shown in'Figs. 14 and 22, and the spiral orifice |5| communicates with fluid under pressure through the bore of the valve member 63 when such valve member is in raised position, as shown in Figs. 1 and 21. Accordingly, the spiral orifice operates in both lowered and raised positions of the valve member 63 to provide a locking means for holding the valve member 63 in its extreme positions during the periods of time consumed by the travel of the pilot rod 16 between its raised and lowered positions. It is to be understood that the diagrammatic Figs. 21 and 22 do not represent the actual method of assembling the elements, and that they are provided merely for the purpose of facilitating an understanding of the method of operation of the invention.

y In a pump of the character shown difficulty has been experienced from the encountering of pockets of gas in the oil to be pumped, and the various expedients employed, suchas gas anchors, etc.. have not been succesul in avoiding injury of the pump due to racing thereof and due to the reciprocating parts striking walls at the ends of their paths of movement. It is found that where gas enters the pumping cylinder so that the pumpving load is practically removed, the pump will start to race, and there is great danger of the pump pistons becoming injured or upset at the ends due to striking the end walls of the pump cylinder. In my invention I provide an effective means for controlling the acceleration and deceleration of the piston and cooperating reciprocating parts at and near the ends of their upward and downward strokes and cushioning the ends of the movement of the reciprocating parts of the pump so that certain of the walls of the pumping unit are relievedvof sudden strains and I lo y apanage so that danger of injury to the pump due to is decreased to a This I accoml'ilish by forming a fluid ordashpot space |55in Vthe upper part of thefcavitl'; Y18 abovethe .,inlet'ports f 19 ieadinginto theupper endof the power cylinder, and also a dashpot -space |58 lin the lower part of the cavity 81 below the ports 89 forming iluid inlets for the lower end of the power cylinder. The piston` 11 at the upper end of its movement is received against a body of fluid contained in the dahpobpace |88 so that it is stopped with' a cushioned effect andi without metal--to-fmetalV contact with the upper end/wallof the cavity 18.

Likewise, at the endof its downward movement, as shown in Fig. 15, the piston 1 1 comes against a body of fluid in the dashpot space |58, and its downward movement is accordinglybrought to a cushioned stop.

" 28 and the upper end of thepower cylinder liner acceleration and deceleration of the piston struc- 49 when the power cylinder 48 `is threaded onto the lower end of the valve body 28, as shown in` Fig. 1'.

nlustrative 'of the method of controlling the ture, it .may be lpointed out that at the ports 19 and 89 the forward end portions of the side walls of the dashpots |55 and |58 are flared or given" a material clearance over the diameter of the piston 11 and are constricted rearwardlyto a small clearance over the. piston diameter. For

example. the dashpots may have a. clearance of .100 inch at their outer ends and .002 inch at their rearward or inner ends. By the'use of an arrangement such as set forth above, the ilowol' fluid from the dashpot spaces at the ends of the piston will be controlled so as to'bringA the piston to a smooth and gradual stop at the end of each stroke, and the control of uid into the dashpot spaces at the ends of the piston will produce a gradual start of thepiston from a position of rest.

Contributing to the present invention is the `novel manner of forming the parts 'so that the.

connecting these fluid passages respectively with the upper and lower ends of the power cylinder.

`In my present structure this is accomplished through the use of the plug body 48 in which a plurality of holes 80 are drilled downwardly in positions to communicate with the lower ends of the passages 35. By use of a small milling cutter, shallow depressions are cut in ,the wall forming the cavity 18 so as to form ports 19 connecting with the lower ends of the passages 80.- In order to connect the secondary passages 31 of the valve body 28 with the lower end of thepower cylinder,

- Iilrst provide external grooves 8| in the plug body 48, and then form thevliner 49 with external grooves so` thatA when thel cylinder 48 isshrunk upon the liner 49, passages 93 will exist, which passages connect the channels8| of the plug body 48With"'the annular space `8| in the lower end of thecylinder 48, connection with the cylinder space being finally accomplished through the ports 89 in the wall'88 4whichseparates the dashpot space |58 from the annular space 9|.-

It is also necessary in a pump of this character e plug by pressing into place.

i to-provide: a means for delivering the fluid which .is tobe pumped toboth the lupper and lower ends v of thepumping cylinder 98 and `to provide valve means within the pump structure' for controlling the intake and discharge of fluid yrelative to both ends of the pumping cylinder space. To simplify `the construction. in this respect, I provide an annular space around each'of thevalve structures 98 and |22, respectively within Vthe tubular end walls y99 and |02' of the pumping cylinder 98, and connect these respective `annular spaces '|3| and |28 with the inlet tube- ||8 which extends downwardly from the tting ||3 with whlchthe lower end lof the pump structure 24 is in sealed engagement as the result ofthe lower extremity |09` of the fitting l| 08 resting within the seat v| I.

" The-lower plug |08 has passages |21 which extend upwardly from the lower end thereof-and through lateral ports |51l connectwith the space |28, `which space in turn connects with the passages |29 leading upwardly around the liner |30 of the` pumping cylinder98 into thespace |3| around :the valve structure 98. The -valve` structure 98,

Vwhich includes aninsert plug |88, is clamped Abetween the lower end of the intermediate plug. 83 and the upper 'end of the liner. |30, and the lower valve structure |22, which includes an"in. `sert vplug |38, is clamped between the lower end of the liner |30 and the upper end of thelower plug |88. Before the walls 89 and |02 are threaded tightly onto the intermediatel and lower plugs83 and |08 respectively, such walls 99 and |02 are heated so as to `produce expansion therey of. They are then screwed up tightly with respect to the p1ugs.83 Vand |08 and contractV on `cooling so as to move the ends of the liner |38 respectively toward the plugs 83 and |08, thereby clamping the valve structures 98and |22 in fluidtight relation to those parts with which they have end-to-end `engagement, as shown in Figs. 2

and 3.

It will be recognized that the valve liner 50 and the plug body 48 could have been made in a single part, but the valve liner 50 is subject to wear, and replacement thereof may be now made without the necessityof providing a new plug body 48, since the plug body 4 8 may be expanded and the worn valve liner removed therefrom, after which a replacement valve liner 50 may be inserted in the plug body 48, enabling the plug body 48 to be continuously employed. The intermediate plug 83 is provided with a removable liner |58 which is initially made slightly oversize and is placed within the bore of the intermediate The liner |58 is in this manner placed under an initial stress so that it will not undergo an additional circumferential reduction due to high pressure fluid which may 'work into the bore of the intermediate plug 83 wash'the wall of the liner |30 andthe exterior `face of the `piston 91 with clean fluid while at kthe same time lubricating these surfaces.

The rods `18,95, and |2| are connectedto the.

pistons" and 91, inthe manner shown, by use of external threads |63 on the rods which engage threads |64 formed near the inner ends of counterbores |65 in the pistons 11 and 91, the

- rods having conical ends |66 at the extreme ends thereof which engage conical seats |61 at the lnner extremities of the counterbores |65 so that a. positive fluid seal is thereby formed between the ends of the rods and the pistons which they engage. A feature of the invention is to provide a means for connecting the rods to the pistons so that they will be practically concentric, but at the Sametime the rods are provided with sulcient flexibility of connection with the pistons to compensate for small deviations from perfect axial alignment of cooperating parts. To accomplish this result, each of the counterbores |65 has an intermediate bore portion |10 formed adjacent s the outer ends of thethreads |64 which is ground to t snugly that portion |1| of the rod adjacent the threads |63, thereby producing an axial alignment of the end of the rod which is independent of the threads |63 and |64. Each of the counterbores |65.has an outer boreportion |12 which is ground to a diameter slightly larger than the rod so that the portion |13 of the rod within the outer end of the counterbore |65 may flex laterally should the rod be slightly out of alignment with other parts of the pump structure with which it cooperates. For this purpose the outer bore portion |12 may be ground to a diameter approximately .002 inch greater than the diameter of the portion |13 of the rod. By use of a construction as hereinabove described, the end of each rod 16, 95, and |2| is given a spaced two-point centralizing engagement with the piston to which it is attached. For instance, the conical end |86 of each rod engages a conical seat |61 at the inner end of a counterbore |65, and a portion 1| of the rod spaced from the end thereof engages an intermediate portion |10 of the counterbore |65. Beyond the intermediate portion |10 the rod may flex within the outer end portion |12 of the cooperating parts require the same.

Although I have herein shown and described I my invention in simple and practical form, it is recognized that certain parts or elements thereof are representative of other parts, elements, or mechanisms which'may be used in substantially the same manner to accomplish substantially the same results; therefore, it is to be understood that the invention is not to be limited to the details disclosed herein but is to be accorded the full scope of the following claims.

I claim as my invention:

1. A deep well pump of the character described, including: a vertically elongated tubular structure having a. power cylinder and a pumping cylinder formed therein; a power piston in said power cylinder; a. pumping piston in said pumping cylinder; a rod connecting said pistons together; valve means operative to control the delivery'of fluid pressure to said power cylinder to actuate said power piston; check valve means for controlling the inlet and discharge of pumped fluid relative to said pumping cylinder; and walls forming dashpots at both ends of said power cylinder for controlling the ends of the reciprocating movement of said power piston therein.

2. A deep well pump of the character described, including: a vertically elongated tubular structure having a power cylinder and a pumping cylinder formed therein; a power piston in said power cylinder; a pumping piston in said pumping cylinder; a rod connecting said pistons together; valve means operative to control the delivery of fluid pressure to said power cylinder to actuate said power piston; check valve means at both ends of said pumping cylinder for controlling the inlet and discharge of pumped uid relative to said pumping cylinder; and walls forming dashpots at both ends of said power cylinder for controlling the ends of the reciprocating movement of said power piston therein.

3. In a deep well pump of the character described, the combination of a valve body adapted to be secured to the lower end of a pressure fluid delivery tube; walls forming a power cylinder at the lower end of said valve body, there being passages extending from saidk valve body to the upper and lower ends of said power cylinder; a power piston operative in said power cylinder; control Valve means in said valve body for controlling the delivery of pressure fluid into said passages and the opening of said passages to discharge in a manner .to produce reciprocation of said power piston; a connecting rod extending downwardly from said power piston; a plug member at the lower end of said power cylinder having an opening through which said rod extends; a pumping cylinder connected to the lower end of said plug member; a pumping piston operative in said pumping cylinder, said pumping piston being connected to the lower end of said connecting rod; check valve means for said pumping cylinder; and walls at the upper and lower ends of said power cylinder forming d-ashpots for controlling the end movements of said power piston.

4. A deep well pump of the character described, including: a vertically elongated tubular structure having a power cylinder and a pumping cylinder formed therein; a power piston in said power cylinder; a pumping piston in said pumping cylinder; a rod connecting said pistons together; a pipe member for conveying an operating fluid from a source of supply to the pump structure; valve means between said pipe member and said power cylinder operative to control the delivery of operating fluid to said power cylinder to actuate said power piston, there being means for controlling the flow of said operating fluid to and from the end of said power cylinder whereby to control the acceleration and deceleration of said pistons; and check valve means for controlling the inlet and discharge of pumped fluid relative to said pumping cylinder.

5. A deep well pump of the character described, including: a vertically elongated tubular structure having a power cylinder and a pumping cylinder formed therein; a power piston in said power cylinder; a pumping piston in said pumping cylinder; a rod connecting said pistons together; valve means operative to control the delivery of fluid pressure to said power cylinder to actuate said power piston, there being means for controlling the flow of fluid to and from the ends of said power cylinder whereby to control the acceleration and deceleration of said pistons; and check valve means for controlling the inlet and discharge of pumped fluid relative to said pumping cylinder.

6. A deep well pump of the character described, including: a pipe member for receiving an operating iluid from a source of supply and delivering the same to the pump; a vertically elongated tubular structure having a power cylinder and a pumping cylinder formed therein; a power piston in said power cylinder; a pumping piston in said pumping cylinder; a rod connecting said pistons together; valve means disposed between said pipe member and said power cylinder to control the delivery of operating iiuid to said power cylinder to `actuate said power piston; check valve means for.l controlling ths-inlet and discharge of pumpedfiuidrelative to said pumping cylinder; and walls forminga dashpot in an end of said powerjcylinder for controlling the end movement of said power piston. f

7. A deep well pump of the character described, including: a pipe member for extending down into,l a well to convey an operating fluid from a source of supply: a pump body having a double acting power cylinder and a pumping cylinder l5 formed therein; a double acting power piston in said power cylinder; a Vpumping piston in said pumping cylinder; means connecting said pistons together; valve means between said -pipe `member and said power cylinder to control the 20 delivery of operating iiuid to said power cylinder whereby to reciprocate said power piston; valve means for controlling the inlet and discharge of pumped fuid relative to said pumping cylinder; and dashpot means `connected to said power piston so as to control the end movement of said power piston, said dashpot means comprising chambers receiving" operating iiuid which has been delivered to said pump body through saidk pipe member. l

$0 8. A deep well pump of the character described,

including: a pipe.member for receiving an operating fluid from a source of supply and de- 1 i livering the same to the pump; a vertically elongated tubular structure having a power cylin- .5 der and av pumping cylinder formed therein;y a power piston in said power cylinder; a pumping piston in said pumping cylinder; a rod connecting said pistons together; valve means disposed between said pipe member Aand said power cylinder to control the delivery of operating fluid to said power cylinder to actuate said power piston; check valve means for controlling the inlet and discharge of .pumped fluid relative to said pumping cylinder; and walls forming a dashpot means connected to said power piston, said dashpot means being connected so as to receive operating iluid which has been' delivered through a said pipe member from said source o f supply.

9. In a deep well pump, the combination of: a fluid operated motor, including a power cylinder having two ends and a power piston adapted to lreciprocate therein; means for delivering an operating iiuid under pressure to said motor so las to reciprocate said power piston; a uid pump adapted to pump iiuid from a well, including a pumping cylinder having a pump piston therein; means for operatively connecting said power piston to said pump piston so that actuation of said power piston will actuate said pump piston to pump iiuid from said well; and means associated with saidapower piston and said power cylinder Y to prevent hammering of said power piston against either end of said power cylinder when decreased.

10. In a deep well pump, `the combination of: a fluid operated motor. including a power cylinder having two ends and a power piston adapted to reciprocate therein: means for delivering an v operating iluid under pressure to said motor and alternatively to opposite ends of said power piston so as to reciprocate said power piston; a fluid pump adapted to pump fluid from a well, including a pumping cylinder having a pump piston therein; means for operatively connectthe pumping load on said pump is substantially ing said power piston to said pump piston so that actuation of, said power piston will actuate said pump piston to pump iluid from said well; and means associated `with said power piston and said power cylinder to prevent hammering of said power piston against either end of said power cylinder when the pumping load'on said pump is substantially decreased.

11. In a deep well pump, the combination oi':

v a uid operated motor, including a power cylin- ,power piston will actuate said pump piston to pump fluid from said well; and a dashpot in each end of said power cylinder for controlling end movement of said power piston. l Y

12. In a deep well pump, the combination of:

a iiuid operated motor, including a power cylinder and a power piston adapted to reciprocate therein; valve means for delivering a continuous flow of operating kiluid under pressure alternatively to opposite ends oi said power piston so as` to reciprocate said power piston; a iluid pump adapted 4to pump fluid from a well, including a pumping cylinder having a pump piston therein; means for operatively connecting said power pis-- ton to said pump piston so that actuation oi' said power piston-will actuate said pump piston to pump fluid from said well; and a dashpot in each end of said power cylinder for controlling acceleration of said power piston at the beginning of each stroke thereof.

13. In a deep well pump, the combination of: a iiuid operated motor, including a power cylinder and a power piston adapted to reciprocate therein; valve means for delivering a continuous flow of operating iiuid lunder pressure alternatively to opposite ends of said power piston so as to reciprocate said power piston; a fluid pump adapted to pump iiuid from a well, including aj pumpingcylinder having a pump piston therein;

vmeans for operatively connecting said power pis- 50 ton to said pump piston so that actuation of said power piston will actuate said pump piston to` pump fluid from said well; and a dashpot in each end of said power cylinder for controlling :de-

therein; valve means ior delivering a continuous flow of operating iluid under pressure alternatively to opposite ends of said power piston so as to` reciprocate said. power-piston; a iuid pump adapted to pump iiuid from a well, including a pumping cylinder having a pump piston therein; means for operatively connecting said power .piston to-said pump piston so that actuation of said power piston will actuate said pump piston to pump iiuid from said well; and a dashpot in CLARENCE J. coiaEnLY.

Disclaimer 2,081,223.0lm"ence J. Uoberly, Los Angeles, Calif. FLUID OPERATED DEEP WELL PUMP. Patent dated May 25, 1937. Disclaimer filed Dec. 17, 1951, by the assignee, Dresser Equipment Campany. Hereby enters this disclaimer to claims 1, 4, 5, v6, 7, 8, and 9 of said patent.

[Oez'al Gazette Janumy 2Q, 1952.]

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