US3126829A - Hydraulic well pump assemblies - Google Patents

Description

3 Sheets-Sheet 1 BY WW ATTORNEYS March 31, 1964 D. T. HARBISON ETAL HYDRAULIC WELL PUMP ASSEMBLIES Filed April 5, 1963 M q 5 N II: 0 W G 4 m u 3 D W. g E A FIG. I

March 1964 D. T. HARBISON ETAL HYDRAULIC WELL. PUMP ASSEMBLIES 5 Sheets-Sheet 2 Filed April 5, 1963 F lG.l-0

INVENTORS Dixon T Horbison ATTORNEYS F|G.|-C James A. Burns March 31, 1964 D. T. HARBISON ETAL 3,126,329

HYDRAULIC WELL PUMP ASSEMBLIES 3 Sheets-Sheet 3 Filed April 5, 1963 INVENTORS Dixon T. Hurbison James A. Burns BY WM ATTORNEYS 3,126,829 HYDRAULIC WELL PUMP ASSEMBLIES Dixon T. Hal-bison and James A. Burns, Fort Worth, Tex., assignors to Harbison-Fischer Manufacturing Co., Fort Worth, Tex., a corporation of Texas Filed Apr. 5, 1963, Ser. No. 270,904 8 Claims. (Cl. 103-46) This invention relates to new and useful improvements in hydraulic well pump assemblies.

There have long been in use in both water wells and petroleum wells rod pumps as well as hydraulic pumps, the former utilizing a solid or tubular pump rod or sucker rod extending from ground level to the location of the well pump in the well bore and depending upon reciprocation of the pump rods within the well tubing for operation of the reciprocal well pump. Such rod pumps have as their primary advantage the simplicity of the structure involved, but they are subject to breakages of the pump rods, to wear or damage to the tubing within which the rods reciprocate, and in particular to space requirements which lace a severe physical limitation upon the smallness of diameter to which the well bore may be reduced.

Hydraulic pumps, utilizing a source of motive liquid under pressure pumped downwardly through the well bore to a hydraulically operated pump have enjoyed some degree of success, but in general either fail to operate satisfactorily on a fully commercial basis, or become quite complex and costly in structure. They are subject to many mechanical dimculties due to the accumulation of paraffin in the well pump components, the difiiculty in maintaining the motive or power fluid sufiiciently clean and free of foreign material as to ensure proper operation, and also due to the difficulty of positioning the pump where desired in the well bore and in retrieving the pump mechanism for servicing or repair when such becomes necessary. In general, most but not all of the hydraulic pumps which have been proposed in the past have proven themselves completely unworkable on a practical basis.

There has also been a growing tendency, particularly in the petroleum industry, to drill wells of smaller and smaller diameters so that the use of a conventional rod pump becomes infeasible, while at the same time, there has not been available a simple yet reliable and durable hydraulic pump for use in such wells. Either the dimensions or the complexity of the hydraulic pumps heretofore available preclude the use of such pumps, and in many instances, the initial cost of the hydraulic pumping equipment is not justified in view of the anticipated production of saleable liquids recovered from the proposed well.

It is, therefore, a primary object of this invention to provide an improved hydraulic well pump assembly which is simple in structure and economical to manufacture, install and operate, and which may be fabricated with such cross-sectional dimensions as to permit the use of the pump assemblies in well bores of relatively small diameter.

A further object of the invention is to provide im- 7 and the relative duration of the upstroke as compared to the downstroke of the pumping mechanism varied as may be found suitable.

A still further object of the invention is to provide an improved hydraulic Well pump assembly in which the liquid produced from the well formation is maintained completely isolated and kept apart from the motive or power liquid being utilized to drive or operate the hydraulic pump so that the contamination of the latter is avoided.

A still further object of the invention is to provide an improved hydraulic well pump assembly utilizing to a very large extent, conventional well pump components readily available as standard commercial items, and requiring the employment of only relatively few specialized components.

An additional object of the invention is to provide an improved hydraulic well pump assembly which is readily and easily mounted in a well bore and correlated with the conductors thereof as well as easily and quickly removed from the well bore when such becomes desirable.

Other and more particular objects of the invention will be apparent from a reading of the following description.

A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings, wherein an example of the invention is shown, and wherein:

FIG. 1 is a vertical sectional view of the upper end of a hydraulic well pump assembly constructed in accordance with this invention, and showing the reversing piston and cylinder thereof,

1G. 1-A is a vertical sectional view, partly in elevation, forming a continuation of FIG. 1, and showing the means for alternating the flow of motive liquid under pressure,

PIG. l-B is a vertical sectional view forming a continuation of FIG. 1A, and showing the motor cylinder and piston,

FIG. 1-0 is a vertical sectional view, forming a continuation of FIG. 1-13, and showing the pump cylinder and piston,

FIG. 1-D is a vertical, sectional view forming a continuation of FIG. l-C, and showing the anchor means for the pump assembly,

FIG. 2 is a schematic view of the well pump assembly showing the same at the beginning of its downward stroke,

FIG. 3 is a view similar to FIG. 2, showing the well pugnp assembly at the beginning of its upward stroke, an

FIG. 4 is a fragmentary, vertical, sectional view taken on the line 44 of FIG. 1-A.

111 the drawings, the numeral 10 designates a conventional well tubing which is shown as being in direct con tact with the earth formation 11 at the top of the well, but which in conventional practice would be received within the usual well casing which, for purposes of simplification, has not been shown, but which itself is normally in direct contact with the earth formation so as to exclude the same from engagement with the well tubing. A flanged tubing head 12 is mounted upon the upper end of the tubing 10 and has secured thereto the flanged lower end 13 of a reversing cylinder and piston assembly designated generally by the numeral 14.

Thereversing assembly 14 includes an elongate reversing cylinder 15 having therein a closed-end, hollow reversing piston 1-6 having a snug sliding fit within the cylinder 15. At the upper end of the reversing assembly there is provided a head member 16' reduced intermediate its ends to form a depending screwthreaded pin 17, and further reduced at its lower end to form a second depending, screwthreaded pin 18 of less diameter than the pin 17. A jacket 19 surrounds the reversing cylinder 15 and is spaced therefrom to provide an annulus 20, the upper end of the jacket '19 being screwthreaded internally and received upon the screwthreaded pin 17, a conventional O-ring seal 21 being provided between the uppermost extremity of the jacket 19 and the upper part of the pin 17. The upper end of the reversing cylinder 15 is also internally screwthreaded and received upon the pin 18 with an O-ring seal 22 being provided at the upper end of the joint between the reversing cylinder and the pin 18. An axial passage 23 extends downwardly through the head member 16 terminating at its lower end in a flared portion 24 which opens into the upper end of the interior of the reversing cylinder 15 above the reversing piston 16.

The reversing cylinder '15 is formed intermediate its ends with a plurality of radially extending ports or passages 25 so positioned that when the reversing piston 16 is in its uppermost position as shown in FIG. 1, the ports 25 are uncovered or exposed to establish communication between the interior of the reversing cylinder 15 below the reversing piston 16 and the annulus 20'. On the other hand, when the reversing piston 16 is in its lowermost position within the reversing cylinder 15, as shown in FIG. 3, the ports 25 remain covered by the side walls of the piston 16 and accordingly, there is no communication between the interior of the reversing cylinder 15 and the annulus 20.

A cross-over fitting 26 is formed with a depending neck 27 which carries the bottom flange 13 for connection to the tubing head 12 and has at its upper end a reduced, externally screwthreaded pin 28 which receives the internally screwthreaded lower end of the jacket 19, there again being provided an O-ring seal 29 between the lowermost extremity of the jacket 19 and the lower portion of the pin 28. At its upper extremity, the upper portion of the cross-over fitting 26 is further reduced to form a second upstanding pin 30 which receives the lower end of the reversing cylinder 15 in snug sliding engagement, there being provided an O-ring seal 31 between the pin 30 and the lower end of the reversing cylinder 15 so that an effective seal is provided but longitudinal spacing of the lower end of the cylinder 15 with respect to the pin 30 is not made critical.

The cross-over fitting 26 is substantially hollow, having an axial bore 32 extending from its lower end to its upper end, the latter being exposed to the lower portion of the interior of the reversing cylinder 15. The member 26 also carries an axial internal conductor 33 closed at its upper end by a plug 34 and having a pair of diametrically opposed branch passages 35 opening from its interior into the lower end of the annulus 21 below the lower end of the reversing cylinder 15. Further, the conductor 33 is formed with an internal web or bridging member 36 above which a lateral passage 37 opens from the interior of the conductor 33 to a discharge conductor 38 extending exteriorly of the cross-over member 26 for the discharge of produced fiuid such as water or petroleum.

An additional lateral passage 39 extends from the interior of the conductor 33 below the bridging member 36 laterally to the exterior of the member 26, and the lowermost portion of the conductor 33 is internally screwthreaded for reception of the upper end of a motive liquid conductor 40 extending downwardly and axially through the well tubing 10.

With this arrangement, the interior of the tubing 14) is placed in communication with the interior of the reversing cylinder 15, the annulus 23 is placed in communication with the discharge conductor 38, and the interior of the motive liquid conductor 41) is placed in communication with the lateral passageway 39. Also, when the reversing piston 16 is in its uppermost position, the interior of the d reversing cylinder 15 is placed in communication with the annulus 20 through the ports 25.

A conductor block 41 is suitably secured to one outer side of the cross-over fitting 26 and carries a transverse passage 52 registering with the lateral passage 39, and an angular passage 43 opening from one lateral wall of the block 4%) to the upper wall or end thereof and receiving a motive liquid conductor 44 communicating between the passage 43 and the axial passage 23 of the head member 16, and thus with the interior of the reversing cylinder 15 above the reversing piston 16. A four-way valve 45 is secured to the lateral Wall of the conductor block 41 and has an inlet fitting 46 for motive liquid under pressure connected to the outlet conductor 47 of a hydraulic pump 48 driven by a suitable motor or other means 49 and drawing motive or hydraulic liquid from a surge tank 50 for delivery under pressure to the inlet fitting 46, there being provided suitable filters and other conventional elements (not shown) such as pressure gauges and the like,'for maintaining the motive liquid free of foreign matter, ensuring delivery thereof at the desired pressure and carrying out other conventional and usual functions. The four-way valve also has an outlet fitting 47' for re turn of motive or hydraulic liquid to the surge vessel 50 through a conductor 51. Of course, any suitable or desirable means may be employed for supplying motive liquid under pressure to the inlet fitting 46 and receiving liquid from the outlet fitting 47. The four-way valve 45 is of conventional construction and includes an internal, vertically reciprocal valve plunger or core 52 along with the usual internal passages 53 which, when the valve core 52 is in its uppermost position as shown in FIG. 1A place the inlet fitting 46 in communication with an internal passage 54 of the four-way valve communicating with the passage 42, while connecting the passage 43 through an internal passage 55 with the outlet fitting 47. When the valve core 52 is in its lowermost position, as shown in FIG. 2, the inlet fitting 46 is placed in communication with the passage 43, and the outlet fitting 47' is placed in communication with the passage 54. Thus, as the valve core 52 is reciprocated vertically, motive liquid under pressure is alternately admitted to the passage 54 while being exhausted through the passage 55, and then admitted to the passage 55 while being exhausted through passage 54. The result is to supply a motive liquid under pressure alternately to the conductor 41) and to the upper end of the reversing cylinder 15 while exhausting such liquid from the other of such members.

For reciprocating the valve core 52 vertically on a controlled basis, a suitable motor or other driving means 56 is provided driving through a speed controller or speed reduction unit 57, a cam 58 which bears against the usual cam roller 59 on the upper end of the valve core 52. The cam 58 is formed of a pair of cam disks 60 and 61 rotatable with respect to one another, but normally held in a locked nonrotational position by means of a fastening element 62 extending through arcuate slots 63 cut in the cam disks. Each of the cam disks has a lobe 64, and it is obvious that by rotational adjustment of the cam disks with respect to one another through loosening of the fastening element 62, the combined extent of the lobes 64 may be increased or decreased to increase or decrease the period of time the valve core 52 is held in its lowermost position, and accordingly to decrease or increase the time the valve core is held in its uppermost position. Of course, regulation of the speed controller 57 permits control and adjustment of the period of time for which the valve core is held in both its upper and lower positions. As shown in FIG. 4, the roller 59 of the valve core is of sufficient width as to engage the peripheries of both of the'cams 60 and 61 at the same time, and accordingly, the angular adjustment of the cam disks becomes effective for simultaneous control of the valve core 52 by both cam disks.

The pumping section of the assembly includes any suitable or desirable type of pump anchor 64 having associated therewith a suitable packing means 65 for sealing ofi between the interior of the tubing and the usual conductor 66 extending interiorly of the anchor member. The particular anchor illustrated in FIG. 1-D of the drawings is that disclosed in our copending application, Serial No. 257,296, filed February 8, 1963, and reference is made thereto, but any suitable type or types of packer and anchor may be employed.

The upper end of the conductor 66 is connected through the usual blind cage standing valve 67, having therein a valve seat 68 and a valve ball 69 moving downwardly to engage the seat and close the valve, with the lower end of an elongate pump barrel or cylinder 70 extending upwardly through the tubing 10. The usual rod guide 71 having lateral discharge passages 72 for discharging pro duced liquid from within the pump barrel or cylinder 7 t) to the interior of the tubing 10 is connected to the upper end of the pump cylinder 78, and has a pump rod or actuating member 53 extending downwardly therethrough. A pump plunger or piston 74 has a snug, sliding, reciprocal fit within the pump cylinder 70, being provided with the usual downwardly-closing traveling valve 75 at its lower end and a tubular mandrel 76 extending upwardly from the traveling valve and carrying the pump piston rings 77. The mandrel 76 extends upwardly from the traveling valve 75 to a top nut 78 having lateral discharge passages 79 for conveying produced liquid flowing upwardly through the traveling valve 75 and the tubular mandrel 76 to the interior of the pump cylinder 76 above the pump piston. The nut 78 is screwthreadedly connected to the lower end of the rod 73 so that reciprocation of the latter results in reciprocation of the pump piston within the pump cylinder.

The pump rod 73 extends upwardly from the rod guide 71 which has an externally screwthreaded pin 80 on its upper end through an upper, closed rod guide 81 connected to the lower end of a motor cylinder 82 disposed within the tubing 18, the rod guide 81 having on its lower end an externally screwthreaded, depending pin 83. A collar 84 connects the lower rod guide '71 and the upper rod guide 81 by screwthreaded engagement with the pins 80 and 83, and confines between the rod guides a sectional, sealing liner 85 which seals off around the rod 73 and is in sliding engagement therewith. The liner 85 thus seals the interior of the motor cylinder 82 from the interiors of the pump cylinder 78 and the tubing 1%).

A motor piston 86 has a snug sliding fit in the motor cylinder 82. The piston 86 is formed with a depending internally screwthreaded box 87 on its lower end within which the upper end of the rod 73 is received, and also has an upwardly extending, internally screwthreaded box 88 on its upper end receiving the lower end of an elongate tubular conductor 89. An axial passage 90 extends downwardiy in the piston 86 from the box 88 and is divided at its lower end into branch passages 91 opening therefrom through the lower end of the piston 86 on opposite sides of the box 87 outwardly of the rod 73 so as to place the conductor 89 and passage 90 in communication with the interior of the motor cylinder 82 below the motor piston 86.

The upper end of the motor cylinder 82 receives an apertured guide member 92 similar to the rod guide 71 and having laterally opening passages 93 placing the upper interior portion of the motor cylinder 82 in communication with the interior of the tubing around the pump assembly. The upper end of the guide member 92 is formed with an internally screwthreaded box 93 with an upstanding annular neck 94 surrounding the same, the screwthreaded lower end of a sealing liner 95 being received in the box 93'. A coupling collar 96 has a screwthreaded box 97 formed on its lower end and surrounded by a depending neck 98, the upper end of the sealing liner 95 being received in the box 97 and joining the box to the guide member 92 and motor cylinder 82.

A spacing sleeve 99 is received externally around the necks 94 and 98, and serves to position the guide member 92 and the coupling collar 96 apart a predetermined distance. The sealing liner sealingly and slidingly engages the exterior surface of the conductor 89 so as to seal off around the conductor 89 below the collar 96. The coupling member 96 also carries an upwardly directed, internally screwthreaded box 108 on its upper end, and the lower screwthreaded end of the motive liquid conductor 40 is received therein. The fluid conductor 89 projecting upwardly through the sealing liner 95 is received in sliding engagement by an axial bore 101 extending between the bottom of the upper box and the top of the lower box 97 of the member 96, and projects upwardly an appreciable distance within the conductor, as shown in FIG. l-B, terminating in an open upper end 102 through which its internal bore is exposed to the interior of the conductor 40.

In the operation of this hydraulic pump, the entire assembly is lowered into the bore of the tubing 10 upon the conductor 40 to the desired elevation in the well bore, and the anchor members 64 and packing element 65 set in the well in the usual manner, the upper end of the conductor 48 being connected, of course, into the lower end of the conductor 33 and the flange 13 of the reversing assembly 14 being connected to the tubing head 12. Now, as the motor 56 and pump motor 49 are set in operation motive liquid under pressure is supplied through the conductor 47 to the inlet fitting 46.

In the position of the reversing assembly shown in FIGS. 1 and 1-A, the unit is just beginning the downstroke of the pump, and as the valve core 52 is moved downwardly by the cam 58, the motive liquid under pressure is caused to flow from the inlet fitting 46 to the passage 55 and passage 43, and through the conductor 44 into the upper end of the reversing cylinder 15. At the same time, the conductor 40 is brought into communication with the outlet or exhaust fitting 47.

As soon as the reversing piston 16 has moved downwardly suificiently to cover the ports 25, produced liquids, such as water or petroleum, will be forced downwardly from the lower portion of the reversing cylinder 15 through the bore 32 of the cross-over fitting 26 around the central conductor 33 and into the annulus between the tubing 16 and the motive liquid conductor 40. This pressure is communicated downwardly through the tubing and through the ports or passages 93 of the upper guide member 92 onto the upper side of the motor piston 86 to force the latter and the piston rod 73 downwardly within the motor cylinder 82, also forcing the pump piston 74 downwardly within the pump cylinder or barrel 70. The standing valve 67 will be closed at this time, and accordingly, the liquid below the pump piston will be forced upwardly through the traveling valve 75, and consequently, there will be no flow of liquid, to speak of, inwardly through the passages 72 of the rod guide 71. As the motor piston 86 moves downwardly in the motor cylinder 82, the liquid beneath the piston in the cylinder is driven upwardly through the passages 91 and the passage 96 into the interior of the conductor 89 and upwardly therethrough into the conductor 48 to flow through the branch passage 39 and the passages 53 and 54 to the outlet fitting 47' and return to the surge tank 56. It is noted that at the lower end of the stroke of the reversing piston 16, the ports 25 remain covered.

Now, as the cam 58 continues its revolution and permits the valve core 52 to move upwardly into the position shown in FIG. 1A, the conductor 44 is placed in communication with the outlet fitting 47, and motive liquid under pressure is directed from the inlet fitting 46 to the passage 42 and branch passage 39 and thence into the motive liquid conductor 48. The motive liquid under pressure flows downwardly through the conductor 46 and into the open upper end 162 of the conductor 89 and downwardly therethrough through the passage 90 and passages 91 into the space within the motor cylinder 82 beneath the piston 36, thus forcing the piston 86 upwardly and forcing produced liquid from the interior of the cylinder 32 above the motor piston 86 outwardly through the passages 93 into the tubing. At the same time, through the connecting rod 73, the pump piston 74- is drawn upwardly in the pump cylinder 7t), drawing produced liquid from the well bore upwardly through the standing valve 67, and forcing the produced liquid above the traveling valve 75 upwardly and outwardly through the ports 72 and upwardly through the tubing lit. The produced liquid flows upwardly through the cross-over fitting 26 into the lower end of the reversing cylinder 15, forcing the reversing piston 15 upwardly therein until the ports 2% are uncovered, after which the produced liquid is forced outwardly through the ports 25 into the annulus 2i? and to storage through the branch passages 35, the conductor 33 and the outlet fitting 38. Thus, only a portion of the liquid forced upwardly by the pump piston 74 is utilized for moving the reversing piston 16 to its upper position, the remainder of the stroke being utilized for flowing produced liquid upwardly through the tubing and outwardly through the outlet fitting 38.

The portion of the motor cylinder 32 above the motor piston 85 constitutes essentially a surge chamber into which and out of which the same volume of liquid flows on each complete pumping cycle, and similarly, the same volume of motive liquid flows in and out of the motor cylinder from beneath the motor piston 86. The same volume of motive liquid also flows into and out of the upper portion of the reversing cylinder 15 on each complete pumping cycle, but the flow of produced liquid through the pumping section of the assembly is always upwardly through the standing valve 67 and the traveling valve 75. Obviously, the pump piston 74 may be given as long a stroke as desired, since all that is necessary is that the reversing cylinder 15 force sufficient liquid downwardly through the tubing on the downstroke to return the pump piston to the lowermost end of its stroke. The volume of liquid produced by the pump piston 74 on each stroke is in no way dependent upon limited mechanical movements at the ground surface such as those of the conventional pumping jack and other usual mechanical pumping equipment utilizing a rod-type pump. At the same time, all the advantages of a rod-type pump are realized along with the advantages of a hydraulic pumping system.

It is to be noted that the motive liquid is fully and completely isolated at all times from the produced liquid, and hence, contamination of the motive liquid is avoided and maintenance of the motive liquid in clean and optimum condition is achieved. Further, it is pointed out that all of the sealing elements are required to seal on one face only, and the difliculties inherent in requiring a sealing element to seal on both inner and outer faces are avoided.

The foregoing description of the invention is explanatory thereof and various changes in the size, shape and materials, as well as in the details of the illustrated construction may be made, within the scope of the appended claims, without departing from the spirit of the invention.

What we claim and desire to secure by Letters Patent is:

1. A hydraulic well pump assembly including a pump cylinder member, a pump plunger member in the pump cylinder member, one of the pump members being adapted to be anchored in a well tubing, downwardly-closing valve means in the pump cylinder member, downwardly-closing valve means in the pump plunger member, one of the pump members being reciprocable with respect to the other, the reciprocable pump member having passage means from its valve means to the exterior of the pump, a motor cylinder above and connected to the pump member adapted to be anchored in a well tubing, a motor piston reciprocable in the motor cylinder, first means sealing the interior of the motor cylinder below the motor piston, reciprocating means connecting the motor piston to the reciprocable pump member and extending through the sealing means, a conductor extending upwardly from the motor cylinder, a tubular stem extending upwardly from the motor piston into the conductor and having its interior exposed to the interior of the motor cylinder below the motor piston, second sealing means in the conductor receiving the tubular stem in sliding sealing engagement, the conductor having an outlet opening exteriorly of the pump between the motor piston and the second sealing means, a reversing cylinder adapted to be mounted at the top of a well in which the pump cylinder member is disposed, a reversing piston in the reversing cylinder, the reversing cylinder having a produced liquid outlet intermediate its ends so positioned as to be covered by the reversing piston when the latter is at one end of its stroke in the reversing cylinder and to be exposed to the interior of the reversing cylinder when the reversing piston is at the other end of its stroke in the reversing cylinder, means exposing one end of the reversing piston to the exterior of the pump, and means for supplying motive liquid under pressure alternately to the opposite end of the reversing piston and to the interior of the conductor above the second sealing means.

2. A hydraulic well pump assembly adapted to be associated with a well tubing and a motive fluid conductor in a well bore and including; a reversing assembly adapted to be mounted at the top of a well including, a reversing cylinder adapted to have one end connected to a well tubing, a reversing piston reciprocably positioned in the reversing cylinder and having one end adapted to be exposed to the interior of the well tubing, the reversing cylinder having a produced liquid outlet intermediate its ends so positioned as to close when the reversing piston is at one end of its stroke in the reversing cylinder and to be exposed to the interior of the reversing cylinder when the reversing piston is at the opposite end of its stroke in the reversing cylinder, and means for supplying motive liquid under pressure alternately to the end of the reversing piston opposite that end adapted to be exposed to the interior of the well tubing and to the interior of the motive fluid conductor; and a well pump including, a motor cylinder adapted to be connected to the motive fluid conductor, a motor piston reciprocably positioned in the motor cylinder, a tubular stem extending upwardly from the motor piston, sealing means sealing between the motor cylinder and the motive fluid conductor and receiving the tubular stem in sliding sealing engagement, the motor cylinder having a liquid flow passage to the interior of the tubing from between the motor piston and the sealing means, the motor piston having a flow passage between the tubular stem and the interior of the motor cylinder below the motor piston, a reciprocal well pump below the motor cylinder having a produced fluid outlet to the well tubing, a movable pumping member forming a part of the reciprocal well pump, means for sealing ofi between the exterior of the reciprocal pump and the well tubing below the produced fluid outlet of the reciprocal pump, and actuating means extending between the motor piston and the movable pumping member of the reciprocal well pump.

3. A hydraulic well pump assembly adapted to be associated with a Well tubing and a motive fluid conductor in a well bore including; a well pump including a pump cylinder having its lower end adapted to be exposed to the interior of the well tubing, means for anchoring the pump cylinder in the well tubing and sealing off the exterior of the pump cylinder from the well tubing therebelow, a pump piston in the pump cylinder, the well cylinder having a first liquid outlet extending from its interior above the pump piston to the interior of the well tubing, downwardly-closing valve means carried by the pump cylinder and the pump piston, a motor cylinder having its lower end connected to the upper end of the pump cylinder, first sealing means between the motor cylinder and the pump cylinder above the first liquid outlet, a motor piston in the motor cylinder, actuating means connected between the motor piston and the pump piston sealingly and slidably engaged by the first sealing means, the motor cylinder being adapted to be connected to the motive fluid conductor, second sealing means adjacent the upper end of the motor cylinder for sealing between the motor cylinder and the motive fluid conductor, the motor cylinder having a second liquid outlet extending from its interior above the motor piston and below the second sealing means to the interior of the well tubing, a tubular stem extending upwardly from the motor piston through the second sealing means in sealing and sliding engagement with the latter, the motor cylinder having passage means extending from the interior of the tubular stem to the interior of the motor cylinder below the motor piston; and a reversing assembly adapted to be mounted at the top of a well including, a reversing cylinder adapted to have one end connected to the upper end of the well tubing, a reversing piston reciprocably positioned in the reversing cylinder and having a first end exposed to the well tubing, and means for alternately supplying motive liquid under pressure to the motive fluid conductor and to the reversing cylinder at that end of the reversing cylinder opposite the end adapted to be connected to the well tubing, the reversing cylinder having a produced liquid outlet intermediate its ends positioned to be uncovered by the reversing piston when the latter reaches the end of its stroke toward that end of the reversing cylinder opposite the end of said cylinder adapted to be com nected to the well tubing and to be covered at all other times.

4. A hydraulic well pump assembly as set forth in claim 3 wherein a jacket surrounds the reversing cylinder it? and the produced liquid outlet opens from the reversing cylinder into the jacket.

5. A hydraulic well pump assembly as set forth in claim 3, and means for varying the frequency with which the supplying of motive liquid to the reversing cylinder and the motive liquid conductor is alternated.

6. A hydraulic well pump assembly as set forth in claim 3, and means for varying the relative lengths of time the motive liquid is supplied to the reversing cylinder and to the motive liquid conductor.

7. A hydraulic well pump assembly as set forth in claim 3 wherein the means for alternately supplying motive liquid under pressure includes a cam-operated fourway valve, an operating cam for the four-way valve, at least two abutting cam disks forming the cam, a cam lobe on each cam disk, and a releasable fastening holding the cam disks against rotational movement with respect to one another, releasing of the fastening allowing rotational adjustment of the cam disks with respect to one another to vary the area of the cam lobes exposed to the four-way valve.

8. A hydraulic well pump assembly as set forth in claim 3 wherein the means for alternately supplying motive liquid under pressure includes a cam-operated fourway valve, an operating cam for the four-way valve, a motor for driving the cam, and a speed controller connecting the motor to the cam to vary the speed of driving the latter.

References Cited in the file of this patent UNITED STATES PATENTS 784,435 Russell Mar. 7, 1905 3,020,848 Green Feb. 13, 1962

Claims (1)

1. A HYDRAULIC WELL PUMP ASSEMBLY INCLUDING A PUMP CYLINDER MEMBER, A PUMP PLUNGER MEMBER IN THE PUMP CYLINDER MEMBER, ONE OF THE PUMP MEMBERS BEING ADAPTED TO BE ANCHORED IN A WELL TUBING, DOWNWARDLY-CLOSING VALVE MEANS IN THE PUMP CYLINDER MEMBER, DOWNWARDLY-CLOSING VALVE MEANS IN THE PUMP PLUNGER MEMBER, ONE OF THE PUMP MEMBERS BEING RECIPROCABLE WITH RESPECT TO THE OTHER, THE RECIPROCABLE PUMP MEMBER HAVING PASSAGE MEANS FROM ITS VALVE MEANS TO THE EXTERIOR OF THE PUMP, A MOTOR CYLINDER ABOVE AND CONNECTED TO THE PUMP MEMBER ADAPTED TO BE ANCHORED IN A WELL TUBING, A MOTOR PISTON RECIPROCABLE IN THE MOTOR CYLINDER, FIRST MEANS SEALING THE INTERIOR OF THE MOTOR CYLINDER BELOW THE MOTOR PISTON, RECIPROCATING MEANS CONNECTING THE MOTOR PISTON TO THE RECIPROCATING PUMP MEMBER AND EXTENDING THROUGH THE SEALING MEANS, A CONDUCTOR EXTENDING UPWARDLY FROM THE MOTOR CYLINDER, A TUBULAR STEM EXTENDING UPWARDLY FROM THE MOTOR PISTON INTO THE CONDUCTOR AND HAVING ITS INTERIOR EXPOSED TO THE INTERIOR OF THE MOTOR CYLINDER BELOW THE MOTOR PISTON, SECOND SEALING MEANS IN THE CONDUCTOR RECEIVING THE TUBULAR STEM IN SLIDING SEALING ENGAGEMENT, THE CONDUCTOR HAVING AN OUTLET OPENING EXTERIORLY OF THE PUMP BETWEEN THE MOTOR PISTON AND THE SECOND SEALING MEANS, A REVERSING CYLINDER ADAPTED TO BE MOUNTED AT THE TOP OF A WELL IN WHICH THE PUMP CYLINDER MEMBER IS DISPOSED, A REVERSING PISTON IN THE REVERSING CYLINDER, THE REVERSING CYLINDER HAVING A PRODUCED LIQUID OUTLET INTERMEDIATE ITS ENDS SO POSITIONED AS TO BE COVERED BY THE REVERSING PISTON WHEN THE LATTER IS AT ONE END OF ITS STROKE IN THE REVERSING CYLINDER AND TO BE EXPOSED TO THE INTERIOR OF THE REVERSING CYLINDER WHEN THE REVERSING PISTON IS AT THE OTHER END OF ITS STROKE IN THE REVERSING CYLINDER, MEANS EXPOSING ONE END OF THE REVERSING PISTON TO THE EXTERIOR OF THE PUMP, AND MEANS FOR SUPPLYING MOTIVE LIQUID UNDER PRESSURE ALTERNATELY TO THE OPPOSITE END OF THE REVERSING PISTON AND TO THE INTERIOR OF THE CONDUCTOR ABOVE THE SECOND SEALING MEANS.

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