US3175513A

US3175513A - Hydraulic pumping unit

Info

Publication number: US3175513A
Application number: US335588A
Authority: US
Inventors: Richard O Dulaney
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-01-03
Filing date: 1964-01-03
Publication date: 1965-03-30
Anticipated expiration: 1982-03-30

Description

March 30, 1965 R. o. DULANEY HYDRAULIC PUMPING UNIT 3 Sheets-Sheet 2 Filed Jan. 3, 1964 .N .mu

March 30, 19755 R. o. DULANY Y 3,175,513

HYDRAULIC FUMPlNGr UN IT Filed Jan. 5, 1964 r .v s sheets-sheet 5 .1r/G. s.

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v 4 INVENTOR. ,Y P/@m90 o.- 004 ,QA/Ex United States Patent O 3,175,513 HYDRAULIC PUNHING UNIT Richard 0. Dulaney, 1403 Continental National Bank Bldg., Fort Worth, Tex. Filed Jan. 3, 1964, Ser. No. 335,588 10 Claims. (Cl. 103-206) This invention relates to hydraulic well pumps, and more particularly to a hydraulic well pump of the walking beam type.

A main object of the invention is to provide a novel and improved hydraulic well pump which is simple in construction, which is eiiicient in operation, and which is relatively compact in size.

A further obiect of the invention is to provide an improved hydraulic well pump of the walking beam type which is actuated by a hydraulic cylinder, the pump involving relatively inexpensive parts, being durable in construction, which is smooth in operation, and which can be accurately adjusted to provide optimum speed of operation.

A still further object of the invention is to provide an improved hydraulic well pump of the walking beam type which employs a hydraulic cylinder for operating the walking beam and a distributing valve for controlling the supply of hydraulic fluid to the operating cylinder, the pump having improved means for eiciently and accurately controlling the action of the distributing valve so as to provide optimum performance of the main hydraulic cylinder, whereby the pump may be operated at high efciency with substantial savings in fuel or power costs.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

FIGURE 1 is a side elevational view of an improved hydraulic `pump constructed in accordance with the present invention, showing the walking beam thereof in a substantially horizontal position, and with a well string secured to its horsehead.

FIGURE 2 is an enlarged, partly diagrammatic vertical cross sectional view showing the distributing valve and the associated valve operator or pilot valve assembly, as employed in the hydraulic pump shown in FIGURE l, the fluid connections being shown diagrammatically by dotted lines.

FIGURE 3 is a somewhat enlarged transverse vertical i cross sectional View taken substantially on the line 3--3 of FIGURE 1.

FIGURE 4 is an enlarged horizontal plan view taken substantially on the line 4-4 of FIGURE 1.

FIGURE 5 is a longitudinal vertical cross sectional view taken substanitally on the line 5-5 of FIGURE 4.

FIGURE 6 is a transverse vertical cross sectional view taken substantially on the line 6-6 of FIGURE 5.

FIGURE 7 is a transverse vertical cross sectional view taken substantially on the line 7-7 of FIGURE 5.

IGURE 8 is a somewhat enlarged transverse vertical cross sectional view taken substantially on the line 8--8 of FIGURE l.

Referring to the drawings, the improved hydraulic well pump assembly is designated generally at 11 and comprises an open rectangular base frame 12 constructed of channel irons and comprising the parallel

longitudinal channel bars

13, 13 which are connected by transverse end channel bars 14. A central Samson post 15 rises from the frame 12 and comprises two pairs of upwardly and laterally inwardly convergent legs 16 which are suitably secured to their lower ends to the

side bars

13, 13. The pairs of legs 16 converge upwardly and longitudinally inwardly towards each other and are rigidly secured at their top ends to the corner portions of the horizontal base member 17 of an upstanding transverse bearing 18 on which is pivotally mounted an upper bearing plate 19 which is in turn rigidly secured to the bottom ange 20ct an I-beam walking beam member 21, at an intermediate location along the walking beam member.

The walking beam member 21 is provided with the forward horsehead 22, land connected thereto at 23 is a well pumping string 24.

Designated at 25 is a counterweight member which is slidably engaged on the top flange 26 of the walking beam member 21, beingr formed with a T-shaped longitudinal groove 27 which receives the top ange 26 and a substantial portion of the web of the walking beam member 21, as shown in FIGURE 6. The counterweight 25 i-s slidable between a pair of

stop sleeves

28 and 29 engaged on and secured to the top flange 26 of the walking beam member 21, the sleeves being provided with clamping screws 30 which are threadedly engaged through their bottom lianges and which are clampingly engageable with the underside of the top flange 26 of the walking beam member 21, whereby to secure the sleeves on said top flange, as illustrated in FIGURE 7.

Secured to the forward end of the counterweight member 25 is a forwardly extending piston rod 31 provided at its forward end with a piston 32 rigidly connected thereto and received in a hydraulic cylinder 33, lfor controlling the position of the counterweight member 25 on the walking beam member 21. A conduit 34 is connected to the rear end or" the cylinder 33 and another conduit 35 is connected to the forward end of said cylinder.

Pivoted to the intermediate portion of the top flange of the front cross member 14, as shown at 36, is an upwardly extending iiuid pressure cylinder 37 The cylinder 37 is provided with a piston having a piston rod 3d whose top end is pivotally connected at 39 to the bottom flange 2d of walking beam member 21 adjacent to horsehead 22. As shown in FIGURE 3, the cylinder 37 contains the piston, shown at 40, which is adapted to be moved upwardly or downwardly in the cylinder by hydraulic iiuid admitted to the respective opposite ends of the cylinder. A pressure fluid supply conduit 41 is connected through a flexible conduit section 42 to the lower end of the cylinder 37 at one side thereof, as shown in FIGURE 3, whereas a second hydraulic iiuid supply conduit 45 is connected through a exible conduit section -44 and a connection conduit 43 to the top end of the tion 49 and a cylinder connection conduit 50 to the top end of the cylinder 37 at the opposite side relative to Vthe connection conduit 43.

Designated generally at 51 is a reciprocating distributing valve assembly which is mounted in any suitable manner horizontally on the Samson post 16, the valve assembly 51 comprising an elongated cylinder 53 containing the slidable core member 54 and provided with the respective opposite end caps 55 and 56 communicating with hydraulic iiuid supply conduits 57 and 58, as shown in FIGURE 2. The cylinder 53 has respective diametrically opposed pairs of

ports

59 and 60, 61 and 62, 63 and 64, and 65 and 66. The pairs of ports are spaced along the cylinder 53 in the manner generally illustrated in FIGURE 2, and the core member 54 is provided with spaced sets of annular grooves 67, 68, 69 and 7d located to at times interconnect the aforesaid pairs of ports. *to its extremerightward position, as shown in FIGURE 2,

tadjustable ypivotal connection at 94.

Thus, with the core member 54 thegrooves 67 simultaneouslyy interconnect the ports 59 and 60, while the grooves 569 interconnect the ports 63 `and '64, the'othe'r remaining pairs of

ports

61 and 62,

and 65 and 66', being sealed orf relative to each other.

Similarly, when the' core member `54 is in its extreme ieftward position, the grooves 68 interconnect the

ports

61 and 62 and the grooves 70 interconnect the ports 65 and 65, whereas the other pairs of

ports

59 and 60 and 63, 64 -are sealed oif relative to each other.

A hydraulic'luid'pressure supply line 71 is connected to -a conduit 72 havingV

respective branches

73 and 74 connected

tothe ports

62 and 64. The conduit 34 is connected through a ilexible conduit section 75 to a conduit'76, which in turn is connected to the port 61.

YA branch conduit 77 connects conduit 76 to conduit 43,

which is connected in turn to the port 60. The conduit 35 is connected through a flexible conduit section 78 to a conduit 79, which in turn is connected to the port 63. A branch conduit 80 connects conduit 79 to the conduit Y'46, which in turn is connected to the port 66. Conduit 57, as shown in FIGURE 2.

Designated at 89 is a pilot valve cylinder for controlling the operation of the core 54, said cylinder 09 being pivoted at 90 to the `Samson post 16. The cylinder 89 is provided with a sliding plunger 91 having a plunger rod 92 which extends slidably and sealingly through a -gland assembly 93 provided at the top end of cylinder 89 and is pivotally connected at 94 to an adjustable support member 95 which slidablyembraces the bottom flange 20 of the walking beam member 21, as shown in FIGURE 8. A manually rotating adjusting screw-96 is vjournaled at its opposite end portions in brackets 97 and 98 secured to the bottom flange 20 of walking beam member 21, the screw member 96 being threadedly engaged through .a` depending lug 99 provided onmember 95, so that the position of said member 95 may be adjusted 4along the flange 20 by rotating the screw 96. VThe screw `96 is provided with a crank handle k100 for manually -rotating same. The aforesaid adjustment of position of the member 95 adjusts the pivotal connection 94 of piston rod 92 along the ange 20. The cylinder 89 is `provided with the Ytwo `spaced

intermediateV ports

101 and 102, the Vflexible conduit S being connected to the upper port 101 and the flexible conduit 57 kbeing con gnected to the lower port 102.Y The conduit 72 .is Vcon-V nected through a exible conduit section 103 to ythe bottom end of cylinder 89, namely, to a bottom conduit 104. The bottom conduit 104 Vis connected by a conduit 105 to the top end ofcylinder 89, so that equal hydraulic yiiuid pressure is provided at the top and bottom ends of the cylinder. A dummy piston rod 106 is secured to the bottom end of the plunger v91 and extends through a seal- -ing.gland 107 Vat the bottom fend' of cylinder89, to balvance the` 'pressure effect of the operating rod '92. By virtue of this arrangement, the plunger 91V is not affected -bythe hydraulic uid ypressure but is operated .merely by the movement of the walking beam 21 through ythe In the lowermost FIGURE 1.

. 4 under pressureV to flow through the conduit 57 to the right end of cylinder 53, whereby the hydraulic iiuid acts against the core 54 and moves the core to the left. As shown in FIGURE 2, in the rightward position of the core 54, grooves 67 connect ports 59 and 60fand grooves 69 connect ports 63-and 64. Hydraulic uid under pressure flows from line 71 to the conduit 74, port 64, grooves 69, port 63 and

conduits

79, 7 8 andv 35 into the right end of cylinder 33, Vas viewed in FiF-URE 1, urging piston 32 to the left, and causing ythercounterweight 25 to move similarly, namely, toward the stop 29. Hydraulic iluid is ailowed to discharge from the left end portion of cylinder 33 to

conduits

34, 75, 77, 48, port 60, grooves 67, port-59 and conduit 82 to the return line 81. A predetermined amount of returned fluid flows from conduit to conduit 82 through the needle valve 87. At the same time, hydraulic fluid under pressure flows from line 71 through conduit 74, port 64, grooves 69, port 63, conduit 79 and conduits k41 and 42 to the bottom end of the main operating cylinder 37, driving the piston 40 upwardly, the hydraulic uid in the upper part of the cylinder discharging to the hydraulic iiuid reservoir through conduits 50, .49 and 48, port 60, grooves 67, port 59, conduit `82 and conduit `81. VThe resultant upward movement ofthe forward end portion of walking beam 21 elevates the pivotalV connection 94, raising the `plunger 91 to its yuppermost position in cylinder 89,

thereby establishing communication between conduit 104 and port 102. This closes of port 101 and allows hydraulic uid under pressure to filow to the right end of cylinder 53 from conduit 71 through conduit 72, conduit 103, port 102 andconduit 57. This drives the core 54 to its leftward position, the fluid in the left end of `the cylinder'53 being allowed to pass to the discharge ,conduit 82 through the conduit 85 and the needle valve S7. The rate of movement of the core 54 may thus be regulated by adjusting the needle kvalve 87.

When the Walking `beam 21 has been thus rotated to elevate the'horsehead 22, the upward movement of the plungerAV 91 causes hydraulic iiuid under pressure to be delivered to the right end of cylinder 53, as viewed in `.FIGURE 2, moving the core 54 at a timed rate, depending upon the adjustment of valve S7, so that it reaches its extreme leftward position, causing areversal of move- -ment ofthe Walking beam, namely, establishing the hydraulic connections required to move the piston 40 downwardly and to move ithecounterweight 25 to the right, namely, towardthe rightstop member 23, shown in This lowers .the plunger 91 to the position thereof shown in FIGURE 2, re-establishing communicationfbetween the top portion ofthe cylinder S9 and port 101, Yso that hydraulicuid under pressure may flow through conduit 58 to the left end of cylinder 53,

theluid in' the right end-of cylinder 53 being discharged position of the plunger 91, the top end portion of 'the v,cylinder-*89 is connected to the port 101, and thence uppermost 'position incylinder9, the conduit 104 communicates' with theA port 102, nallowing `hydraulic uid throughrconduit Srand the adjustable needle valve 8S to the discharge conduit 83. The Yrate of discharge of -the hydraulic fluid from the right endy of cylinder 53 may similarly be regulated by adjusting the needle valve 88. The raterof movement of the core54 may thus be vindependently regulated foreither direction of its movement, because of the independent adjustment provided Iof* the needle valves 87 and. The timing of the movevment of the coremember 54 may also be accurately adjusted by adjusting the position of the pivotal connection-94-by-means'of crank handle 100 Vassociatedwith screw 96. ThisV adjustment is independent of the value of the hydraulic `1iuidpressure,-since the pressures in the top and bottom portions of the pilot valve cylinder '89 are lalways equal, so that the hydraulic iluid exerts no effective force on the plunger 91, andthe movement of said plunger is regulated solely by the movements of `the Walking beam 21.

ance with the rocking movement of the walking beam 21 to alternately expose its

ports

101 and 102 to the pressure iluid delivered to the inlet conduit 104 and supplied to the top and bottom end portions of cylinder 39. The core 54 is thus reciprocated, the reciprocating movement of the core being regulated in speed by the adjustment of the

needle valves

87 and 88, as above explained. This correspondingly regulates the speed of the upward and downward movement of the piston 40 in the ram cylinder 37 and similarly regulates the forward and rearward reciprocating movement of the piston 32 in the counterweight operating cylinder 33. When piston 40 is moved upwardly, namely, in a direction to elevate the horsehead 22, the piston 32 is moved rearwardly, moving the counterweight 25 toward the stop 29, which adds to the lifting moment acting on the horsehead 22 and urging the walking beam 21 in a counterclockwise direction, as viewed in FGURE 1. The upward movement of the hydraulic piston rod 38 is concurrent with the upward movement of the pilot valve piston rod 92, so that at the end of the upward stroke the lower port 102 of the pilot valve is exposed to the pressure iluid, causing reversal of the distributing valve l., thereby reversing the direction of movement of pistons 40 and 32. As a result, the horsehead 22 is moved up and down, following the rocking motion of the walking beam 21. This motion continues until the supply of pressure fluid to line '71 is cut ott.

An important feature of the present invention is the provision of the

needle valves

88 and 87 to control the speed of travel of the plunger core 54 in the distributing valve 51, and also the provision of the dummy rod 196 in the pilot valve 89 to equalize the pressure at the opposite ends of the pilot valve chamber. It will be further noted that the apparatus includes means to shift the counterweight member 25 in a manner to balance the up and down strokes and to cooperate with the main hydraulic ram assembly. The apparatus includes the necessary structure to provide the necessary increased lifting power for the upward stroke of the drill string, which usually requires of the order of fifty percent more power than the downward stroke. At the same time, the required mass of the counterweight 25 is held to a minimum. The uid pressure lines are connected to both

cylinders

37 and 33 at the same time, so that the counterweight 25 is operated to equalize the load, on the upstroke, and to facilitate the elevation thereof by the main hydraulic ram assembly, enabling automatic and rapid lifting of the load on the upstroke.

While a specific embodiment of an improved hydraulic Well pump has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

1. A hydraulic well pump comprising a base, an upstanding Samson post on the base, a generally horizontal walking beam pivoted intermediate its ends on the post, a well string secured to one end of the walking beam, a counterbalance weight slidably mounted on the walking beam adjacent its opposite end, a hydraulic cylinder mounted on the walking beam in parallel relationship thereto and having a piston provided with a piston rod, means connecting said piston rod to said counterbalance weight, a hydraulic ram pivoted to the Walking beam opposite said counterbalance weight and pivoted on the base, distributing valve means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator, said valve operator comprising a pilot valve cylinder member containing a plunger member, one of said members being pivotally connected to the walking beam and the other member being pivotally connected to the post, the plunger member being continuously moved in the cylinder member as the walking beam oscillates on the post, a hydraulic return line connected to the distributing Valve means and to the valve operator, and a uid pressure line connected to the distributing valve means through the valve operator, said valve operator being provided with means to operate the distributing valve means responsive to the movement of the plunger member in the cylinder member.

2. A hydraulic well pump comprising a base, an upstanding Samson post on the base, a generally horizontal walking beam pivoted intermediate its ends on the post, a well string secured to one end of the walking beam, a counterbalance weight slidably mounted on the walking beam adjacent its opposite end, a hydraulic cylinder mounted on the walking beam in parallel relation thereto and having a piston provided with a piston rod, means connecting said piston rod to said counterbalance Weight, a hydraulic ram pivoted to the Walking beam opposite said counterbalance weight and pivoted on the base, distributing valve means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator operatively connected to said distributing valve means, said valve operator comprising a pilot cylinder member containing a plunger member, one of said members being pivotally connected to the walking beam and the other member being pivotally connected to the post, the plunger member being continuously moved in the cylinder member as the walking beam oscillates on the post, a hydraulic return line connected to the distributing valve means and to the valve operator, and a fluid pressure line connected to the distributing valve means through the valve operator, said valve operator being provided with means to operate the distributing valve means responsive to the movement of the plunger member in the cylinder member.

3. A hydraulic well pump comprising a base, an upstanding Samson post on the base, a generally horizontal walking beam pivoted intermediate its ends on the post, a well string secured to one end of the walking beam, a counterbalance weight slidably mounted on the walking beam adjacent its opposite end, a hydraulic cylinder mounted on the walking beam in parallel relation thereto and having a piston provided with a piston rod, means connecting said piston rod to said counterbalance weight, a hydraulic ram pivoted to the walking beam opposite said counterbalance weight and pivoted on the base, distributing valve means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator, said valve operator comprising a pilot valve cylinder member containing a plunger member, one of said members being pivotally connected to the walking beam and the other member being pivotally connected to the post, the plunger member being continuously moved in the cylinder as the walking beam oscillates on the post, said valve operator having a pair of outlet ports connected to opposite ends of said distributing valve means and having hydraulic uid inlet means, means to communicatively connect said inlet means alternately to said outlet ports responsive to the movement of the plunger member to two respective predetermined positions in the cylinder member, a luid pressure line connected to said distributing valve means and said uid inlet means, a hydraulic return line connected to the distributing valve means, and means in said distributing valve means to connect said fluid pressure line alternately to opposite ends of said cylinder responsive to the admission of pressure fluid into the opposite ends of said distributing valve means and to simultaneously operate said hydraulic ram.

4. A hydraulic well pump comprising a base, an upstanding Samson post on the base, a generally horizontal walking beam pivoted intermediate its ends on the post, a Well string secured to one end of the walking beam, a counterbalance weight slidably `mounted on-the walking beamfadjaent its opposite end, a hydraulic:V cylinder mounted on the walking beam in parallel relation lthereto andjhaving a piston Aprovided with a piston rod,

means connecting said piston rod to said counterbalance weight, a hydraulic Vrampivotedto the walking beamV opposite said counterbalance weight and pivoted on thel nected to the post, the plunger member being continuously moved inthe cylinderrnember as the walking beam oscillates on the post, said valve operatorhaving a pair of outlet ports connected to opposite ends ofnsaid distributing valve means and having hydraulic fluid inlet means, means Vto communicatively connect said inlet means alternately to said outlet por-ts responsive to the movement of the plunger-member to two respective predetermined positions in the cylinder member, a iiuid pressure line connected to said distributing valve means and said fluid inlet means, a hydraulic return line connected to the distributing valve means,;means in said Adistributing valve meanspfto connect said .fluid pressure line alternately to opposite vends of said cylinder responsive to the admission of pressure'fluid into the opposite ends of said distributing valve means and to simultaneously operate said hydraulic ram, and restricted bypass means connecting each end of said distributing 4valve means to the hydraulic return line.

5. A hydraulic well pump comprising a base, an npstandingkSamson post on thebase, a generally horizontal-walking'beam pivoted intermediate its ends on the post, a well string secured to one end of the walking beam, a counterbalance'weight slidably mounted on the Walking beam adjacent its opposite end, a hydraulic cyl-V inder mounted on the Walking beam in parallel relation thereto and having a piston provided Vwith a piston rod, means connecting said piston rod to said counterbalance weight, a hydraulic ram pivoted to the walking beam opposite said counter balance :weight andpivoted on the base, distributing valve'means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic Valve operator, said valve operator comprising a pilot valve cylinder membercontaining a plunger member, one vofsaid members being pivotally connected to the walking beam and the other member being pivotally vconnected to the post, the plunger member being continuously moved inthe cylinder member as the Walking beam oscillates onthe post, said valveoperator having a pair of outlet ports connected to opposite ends of said distributing valve means and havinghydraulic fluid inlet means, means to communicatively connect said in- 'let means. alternately to said outlet ports responsive to `the movement ofthe plunger member to two respective predetermined positions in the cylinder member, a duid pressure line connected to said distributing valve Lmeans and said fluid inlet means, a V,hydraulic return vline connected to the distributingvalve means, means `in said distributing valve means to connect said fluid fduit meansconnecting each end of said distributing valve Vmeansto thefhydraulic return line, each of said last- 'named conduit `means includingta variable restriction.

6. A hydraulic well pump comprisingr a base, an upstanding Samson post on the base, a generally horizontal vWalking beam pivoted intermediate its ends on the post, a well string secured to one `endfof the walking jbeam, a counterbalance weight slidably mountedon Vthe Walking beam adjacent its opposite end, a hydraulic cyl- Vinder mounted-.on the walking beam in parallel relation .thereto and having a .piston provided with a piston rod, ymeans connecting said position rod to said counterbal- .ance weight, a hydraulic ram pivoted to the walking beam Vvopposite, said counterb'alance weight and pivoted yon the base, distributing valve means connected between .said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator,` said valve operator. comprising yarpilotvalve cylindermember containing a plunger meL ber, one of said members being pivotally connected to the walking beam and the other member being pivotally .connected to the post, the plungerrmember being continuously moved in the cylinder member as the walking beam oscillates on the post, said valve operator having a pair of outlet ports connected to opposite ends of said distributing valve means and having hydraulic fluid inlet means, means to communicatively connect said inlet means alternately to `said V,outlet ports responsive to the movement of the plunger member `to two respective predetermined positions in the cylinder member, a iiuid pressure line connected tosaid distributing valve means and said fluid inlet means, a'hydraulic return line connected to the distributing valve means,rmeans in said distributing valve means toV connectsaid iluid pressure line alternately to oppositeends of said cylinder responsive to the admission oi pressure iiuid into the opposite ends of said distributing valve means and to simultaneously operate said hydraulic ram, and conduit means connecting each ,end of. said distributing valve means to theY hydraulic return line, .each of said last-named conduit means including a manuallyadjustableneedlervalve arranged to adjust the eiiective cross sectional area thereof.

7. A hydraulic well pump comprising a base, an u standing Samson post on thelbase, a generally horizontal Walking beam pivoted intermediate Vits `ends on the post, alwell stringfsecured to one end of the walking beam, a counterbalance Weight slidably mounted on the walking beam adjacent its opposite en d, a hydraulic cylinder Ymounted on theV walking beam in parallel relation thereto and having a pistonprovided with a piston rod, means connecting said piston rod to said counterbalance weight, a hydraulic ram pivoted to the walking beam opposite said counterbalance weightand pivoted on the base, distributing valve means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator, said Valve Voperator comprising an elongated valve chamber Vhaving a pair uof intermediate spaced outlet ports .connected ,to opposite ends .of said distributing valve means and having hydraulic uid inlet means at its Vopposite end portions, a valve element slidably mounted in said chamber, the opposite ends of the hydraulic valve operator being respectively pivotally connected to the walking beam 0n one side of the post .and to said post so that the valve element is continuously movedi in the valve chamber as the walking beam oscillates on the post, said valve element being moved a sufticient distance in said chamber 'by the oscillation oi the Walking beam `to alternately communicatively connect Adistributing valve means, and means in said distributing valve means to connect said iluid pressure line alternately Vto opposite ends of said cylinder responsive to the alternate admission of pressure iluid into the opposite ends of said distributing valve means and to simultaneously operater` said hydraulic ram.

8. A hydraulic Ywell pump comprising a base, an upstanding Samson post on the base, a generally horizon- -tal walking beam pivoted intermediate its ends on the post, 'a well string secured to one end of'the walking beam, acounterbalance-weight slidably mounted ron the walking beam adjacent itsy opposite end, a hydraulic cylinder mounted on thenwalking beam in-fparallel relation theretoY and having a piston .provided Vwith a piston rod,

means connecting said piston rod to said counterbalance weight, a hydraulic ram pivoted to the walking beam opposite said counterbalance weight and pivoted on the base, distributing valve means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator, said valve operator comprising an elongated valve chamber having a pair of intermediate spaced outlet ports connected to opposite ends of said distributing valve means and having hydraulic fluid inlet means at its opposite end portions, a valve element slidably mounted in said chamber, the opposite ends of the hydraulic valve operator being respectively pivotally connected to the walking beam on one side of the post and to said post so that the valve element is continuously moved in the valve chamber as the walking beam oscillates on the post, said valve element being moved a sufcient distance in said chamber by the oscillation of the walking beam to alternately communicatively connect said inlet means to said outlet ports, a uid pressure line connected to said distributing valve means and said inlet means, a hydraulic return line connected to said distributing valve means, means in said distributing valve means to connect said fluid pressure line alternately to opposite ends of said cylinder responsive to the alternate admission of pressure fluid into the opposite ends of said distributing valve means and to simultaneously operate said hydraulic ram, and restricted bypass means connecting each end of said distributing valve means to the hydraulic return line.

9. A hydraulic well pump comprising a base, an upstanding Samson post on the base, a generally horizontal walking beam pivoted intermediate its ends on the post, a well string secured to one end of the walking beam, a counterbalance Weight slidably mounted on the Walking beam adjacent its opposite end, a hydraulic cylinder mounted on the Walking beam in parallel relation thereto and having a piston provided with a piston rod, means connecting said piston rod to said counterbalance Weight, a hydraulic ram pivoted to the Walking beam opposite said counterbalance Weight and pivoted on the base, distributing valve means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator, said valve operator comprising an elongated valve chamber having a pair of intermediate spaced outlet ports connected to opposite ends of said distributing valve means and having hydraulic iluid inlet means at its opposite end portions, a valve element slidably mounted in said chamber, the opposite ends of the hydraulic valve operator being respectively pivotally connected to the walking beam on one side of the post and to said post so that the valve element is continuously moved in the valve chamber as the walking beam oscillates on the post, said valve element being moved a suicient distance in said chamber by the oscillation of the walking beam to alternately communicatively connect said inlet means to said outlet ports, a Huid pressure line connected to said distributing valve means and said inlet means, a hydraulic return line connected to said distributing valve means, means in said distributing valve means to connect said uid pressure line alternately to opposite ends of said cylinder responsive to the alternate admission of pressure uid into the opposite ends of said distributing valve means and to simultaneously operate said hydraulic ram, restricted bypass means connecting each end of said distributing valve means to the hydraulic return line, and means to adjust the point of pivotal connection of said hydraulic valve operator to the walking beam.

10. A hydraulic well pump comprising a base, an upstanding Samson post on the base, a generally horizontal walking beam pivoted intermediate its ends on the post, a well string secured to one end of the walking beam, a counterbalance weight slidably mounted on the walking beam adjacent -its opposite end, a hydraulic cylinder mounted on the walking beam in parallel relation thereto and having a piston provided with a piston rod, means connecting said piston rod to said counterbalance Weight, a hydraulic ram pivoted to the Walking beam opposite said counterbalance Weight and pivoted on the base, distributing valve means connected between said hydraulic cylinder and said hydraulic ram, a hydraulic valve operator, said valve operator comprising an elongated valve chamber having a pair of intermediate spaced outlet ports connected to opposite ends of said distributing -valve means and having hydraulic uid inlet means at `its opposite end portions, a valve element slidably mounted in said chamber, the opposite ends of the hydraulic valve operator being respectively pivotally connected to the walking beam on one side of the post and to said post so that the valve element is continuously moved in the valve chamber as the walking beam oscillates on the post, said valve element being moved a sufficient distance in said chamber by the oscillation of the walking beam to alternately communicatively connect said inlet means to said outlet ports, a fluid pressure line connected to said distributing valve means and said inlet means, a hydraulic return line connected to said distributing valve means, means in said distributing valve means to connect said liuid pressure line alternately to opposite ends of said cylinder responsive to the alternate admission of pressure uid into the opposite ends of said distributing valve means and to simultaneously operate said hydraulic ram, and restricted bypass means connecting each end of said distributing valve means to the hydraulic return line, said valve operator including a walking beam connection rod extending slidably and sealingly through one end of said elongated valve chamber and connected between the walking beam and said valve element, and a pressure balancing dummy rod connected to said valve element and extending slidably and sealingly through the opposite end of said elongated valve chamber.

References Cited by the Examiner UNITED STATES PATENTS 2,432,735 12/47 Downing '74--589X LAURENCE V. EFNER, Primary Examiner.

ROBERT M. WALKER, Examiner.

Claims

1. A HYDRAULIC WELL PUMP COMPRISING A BASE, AN UPSTANDING SAMSON POST ON THE BASE, A GENERALLY HORIZONTAL WALKING BEAM PIVOTED INTERMEDIATE ITS ENDS ON THE POST, A WELL STRING SECURED TO ONE END OF THE WALKING BEAM, A COUNTERBALANCE WEIGHT SLIDABLY MOUNTED ON THE WALKING BEAM ADJACENT ITS OPPOSITE END, A HYDRAULIC CYLINDER MOUNTED ON THE WALKING BEAM IN PARALLEL RELATIONSHIP THERETO AND HAVING A PISTON PROVIDED WITH A PISTON ROD, MEANS CONNECTING SAID PISTON ROD TO SAID COUNTERBALANCE WEIGHT, A HYDRAULIC RAM PIVOTED TO THE WALKING BEAM OPPOSITE SAID COUNTERBALANCE WEIGHT AND PIVOTED ON THE BASE, DISTRIBUTING VALVE MEANS CONNECTED BETWEEN SAID HYDRAULIC CYLINDER AND SAID HYDRAULIC RAM, A HYDRAULIC VALVE OPERATOR, SAID VALVE OPERATOR COMPRISING A PILOT VALVE CYLINDER MEMBER CONTAINING A PLUNGER MEMBER, ONE OF SAID MEMBERS BEING PIVOTALLY CONNECTED TO THE WALKING BEAM AND THE OTHER MEMBER BEING PIVOTALLY CONNECTED TO THE POST, THE PLUNGER MEMBER BEING CONTINUOUSLY MOVED IN THE CYLINDER MEMBER AS THE WALKING BEAM OSCILLATES ON THE POST, A HYDRAULIC RETURN LINE CONNECTED TO THE DISTRIBUTING VALVE MEANS AND THE VALVE OPERATOR, AND A FLUID PRESSURE LINE CONNECTED TO THE DISTRIBUTING VALVE MEANS THROUGH THE VALVE OPERATOR, SAID VALVE OPERATOR BEING PROVIDED WITH MEANS TO OPERATE THE DISTRIBUTING VALVE MEANS RESPONSIVE TO THE MOVEMENT OF THE PLUNGER MEMBER IN THE CYLINDER MEMBER.