US2427703A - Combination pump and gas lift - Google Patents

Description

lH. s. -BERKEY COMBINATION PUMP AND GAS LIFT Sept. 23, 1947.

Filed Jan. 15, 1945 2 Sheets-Sheet 1 @www fill/lll.

lNvENToR Maf/.5255

l l l ATTORNEY.

Sept. 23,v 1947. H. s. BE'RKEY COMBINATION PUMP AND GAS LIFTv I Filed Jan. 15, 1945 INVENTO R. j 55E/Eg l ATTORN EY.

BY//Y Patented Sept. 23, 1947 UNITED STATES PATENT OFFICE COMBINATION PUMP AND GAS LIFT Hugh S. Berkey, Orange, Calif.

Application January 15, 1945, Serial No. 572,855

9 Claims.

This invention in general relates to the art of lifting liquids to the surface of the ground from wells, such as oil wells and the like. The invention may be classed more particularly as relating to oil well pumps of the type known as fluid operated pumps wherein the pump is operated without the use of sucker rods and other standard equipment ordinarily used in pumping wells.

The present invention is an improvement on the type of fluid operated pumps such as shown and described in my Patent No. 1,868,874, the present apparatus being particularly designed to the ordinary tubing in the Well.

Ingeneral, the present invention consists of .a unit which is suspended in a well upon tubing into which extends the discharge tube of the apparatus connected to what is usually termed the macaroni. It embodies the use of gas under pressure which is conducted from above ground down the well to a control unit containing a valve assembly which controls the passage of the high pressure gas into a cylinder for the operation of the piston connected to land which operates a reciprocating pump below the control unit, such control unit also controlling the discharge of exhaust gas from the cylinder to the discharge tube of the well where it intermingles with the column of fluid being pumped, lightening such fluid and acting as a gas lift so that the present invention combines the two principles of lifting fluid from the Well, to wit, the reciprocating pump and what is known as the gas lift.

It is well known that ordinary pumping apparatus for oil wells is unsatisfactory and limited in capacity, particularly in deep wells, with a consequent limited production. Gas lift methods presently employed are only satisfactory under certain well conditions and are usually capable of successful operation only during a short time, as for instance, such methods are inoperative When the rock pressure in the well falls below the pressure required to lift the fluid to the surface, which is a condition frequently met with.

The present invention combines the desirable features of both the ordinary pump and gas lift and is not limited in size by the ability of the surface equipment or rod stretch of the ordinary pump but only by the diameter of the well casing and the capacity of the well to produce, and while the gas lift principle is embodied in the present invention it is not limited to or dependent upon the rock pressure in the well as the gas pressure for operation of the apparatus 2 is dependent only upon the equipment labov ground.

It is a primary object of this invention to produce an apparatus of the class described of simple form and construction, reliable and highly eilicient in its operation, and which is not limited by gas conditions in the well.

It is a furtherobject of this invention to produce an apparatus of the class described and in which the control mechanism is of simple form and operation and by means of which the exhaust gas from the operation of the pump is delivered into the discharge tube of pumped liquid, thereby lightening the column in the discharge tube and macaroni, materially lessening the load on the pump.

The general construction of the apparatus contemplated by this invention consists of a delivery tube which discharges into the macaroni, the latter extending through the casing head of the well. A power unit associated with the delivery tube is suspended in the well casing and also associated with a pump connected thereto and below the power unit, the Whole apparatus being suspended in a casing at a point near the bottom of the well. The power unit includes a power cylinder containing the power piston which is connected to and operates the pump, the piston containing therein a valve assembly by means of which a flow of high pressure gas from the top of the well is directed to the opposite ends of the piston and which also controls the delivery of exhaust gas from the cylinder into the discharge :flow of pumped liquid.

Other objects and advantages will appear hereinafter from the following description and drawlngs.

Referring to the drawings, which are for illustrative purposes only:

Figs. 1, la, lb :and 1c are sectional elevational views in successive order showing sections of the entire assembly from top to bottom;

Fig. 2 is an enlarged sectional elevational View showing in detail the construction of the control `assembly inclusive of the cylinder, piston and valve mechanism;

Fig. 3 is a sectional plan View on line 3--3,

Fig. 2;

Fig. 4 is a sectional plan view on line 4 4, Fig. 2;

Fig. 5 is a sectional plan view on line 5--5, Fig. 2;

Fig. 6 is a sectional plan view on line 6 6, Fig. 2;

Fig. 7 is a sectional plan view on line 1--1, Fig. 2;

Fig. 8 is a sectional elevational view which may be considered as having been taken through the side of the piston in a plane represented by the line 8 8, Fig. 3, showing the valve rods in position at start of upstroke; and

Fig. 9 is a sectional elevational View similar to Fig. 8, showing the valve rods in position at the beginning of the downstroke.

Referring more particularly to the drawings, II] indicates the ordinary well tubing connected at the upper end to the usual string of tubing and connected at its lower end by means of threads or in any suitable manner to the pump shoe or anchor body indicated at II. This tubing forms a casing which encloses the apparatus embodying my invention. This tubing hangs in the well casing, being supported therein from the top of the well in any well known manner.

The power unit consists of an upper tube section indicated at I2 which is threaded to a top head indicated at I3 and at its lower end to the upper cylinder head or coupling indicated at I4. This tubing forms an upper pressure chamber indicated at I and is provided at its upper portion directly under the top head I3 with a series of perforations indicated at I6Y which form inlets to the pressure chamber I5 from an annular space indicated at I1 between the tubing I0 and the upper tube section I2 which space conducts the high pressure gas from the upper pressure chamber to the cylinder of the engine, as more fully hereinafter described.

Threaded to the lower end of the upper cylinder head I4 is a second tube indicated at 20 which formsa cylinder for the piston hereinafter described. The lower end of thisk tube is threadedy to or otherwise connected to the upper end of a lower cylinder head indicated at 2 I. 22 indicates an upper discharge tube which slideably extends through the top head I3, such top head being provided with a stuiilng box indicated at 23. The lower end of the tube 22 is threaded into the upper end of a coupling indicated at 24. This coupling receives and is threaded to the upper end of an inner traveling tube 25 which extends through and is spaced apart from an outer traveling tube indicated at 26, the space between. the tubes 25 and 26 forming an annular passage indicated at 21 for the high pressure gas, as more fully hereinafter described.

The upper end of the outer traveling tube 26 is threaded into the lower end of the coupling 24 and the lower end of the traveling tube 26 is threaded into the upper end of a coupling indicated at 28. The outer traveling tube 26 between the couplings 24 and 21 is perforated as indicated at 29 and may be designated as a strainer nipple. These perforations permit entrance of the high pressure gas from the upper pressure chamber I5 into the space or passage 21 between the traveling tubes. The outer traveling tube 26 is made in two sections. A lower section of the traveling tube indicated at 30, at its upper end is threaded into the coupling 28 and extends downwardly through the upper cylinder head I4 to the upper end of a cylindrical power piston indicated at 32 to which the section 30 is threaded. The lower end of the inner traveling tube 25 extends into the piston 32 and is threaded at its lower end into the piston as indicated at 33, thereby leaving acircular space or chamber 34 in the piston which is in open communication with the space 21 between the traveling tubes and consequently receives from such space between the tubes the high pressure gas.

Threaded into the lower end of the piston 32 as indicated at 35 is a tube 36 which extends downwardly through the lower cylinder head 2 I, through a stuffing box 31 therein, and is threaded at its lower end into an upper plunger coupling indicated at 38.

Slideably extending through longitudinal bores 39 in the piston are four valve members indicated at 40 connected or tied together at their upper ends by means of a valve yoke ring 4I and at their lower ends by means of a yoke ring indi- -cated at 42, the ends of the valve members being threaded to receive nuts indicated at 43. The valve members 40 are provided with cutaway portions indicated at 45 which alternately open and close ports as, for instance, high pressure gas inlet ports indicated at 46 which open into and receive high pressure gas from the chamber 34 in the piston and exhaust valve ports 41 which communicate with exhaust ports 48 which open into the hollow bore or chamber 49 in the piston, which chamber is in open communication with the lower end of the inner traveling tubes 25 through which the pump discharges the well mixture into the upper discharge tube 22. It in turn discharges` the mixture into the discharge tubing of the well commonly known as macaroni, indicated at 5I), the gas discharge from the engine through the ports 48 lightening the column and thereby acting as a gas lift for assisting the discharge of oil from the apparatus to the ground surface.

As heretofore explained, high pressure gas passes from the` chamber 34 in the piston through ports 46 which communicate with the bores or valvechambers in which the valve members 40 operate, such chambers having ports 5I, and 52, respectively above and below a wall 5 I2 separating upward bore 5 Ia and downward bore 52a through which the high pressure gases pass respectively to the upper and lower end of the cylinder 20. From the upper and lower ends of the cylinder respectively the exhaust gases pass through down bore 53a and upward bore 54a and ports 53 and 54, separated by the wall 534 through port 48 into the chamber 49 in the piston through which the mixture from the oil well passes upwardly as the same is pumped. For the purpose of releasably holding the valve members at the ends of their stroke, a valve lock indicated at 56 is provided, which constitutes a tube or pipe section 51 mounted crosswise in the piston and balls 59 in the pipeA section which are pressed outwardly by a spring 60 into engagement with the valve members. Bumpers are provided at each end of the piston within the cylinder, a bumper indicated at 62 being provided above the piston, cushioned by means of a bumper spring 63 which extends between the bumper 62 to the upper cylinder head I 4 and below the piston is a bumper 64 which is yieldingly supported by a bumper spring 65 which extends between the bumper 64 and the lower cylinder head 2 I.

The bumper springs 63 and 65 perform two functions. For instance, as shown in Fig. 2 of the drawings, the piston and valve members are in the position assumed when the piston has just started its upward movement, it being noted that the balls 59 of the valve lock are in engagement with a reduced portion of the valve members below a shoulder formed by the cutaway portion of such members. The parts remain in this position during the upward travel of the piston until the upper end of the valve members 40 engage the lower surface of bumper 62. The continued upward movement of the piston causes the bumper to be moved upwardly against the resistance of the spring 63 and when the spring 63 is loaded to a point where the pressure of the bumper causes the valve members to move downwardly in the piston, the balls 59 of Valve lock 56 are pressed inwardly by the enlarged portion of the valve members sufficiently to permit the valve members to move downwardly past the Valve lock until the balls engage the reduced portion just above the enlarged portion of the valve members just referred to. This movement just described changes the relation of the valve members to the piston, closing the high pressure ports 52 and opening the high pressure port 5|, at the same time exhaust ports 54 are opened.

The pump assembly portion of the apparatus may be described as follows. Above it has been pointed out that the tubing IIJ is connected at its lower end to the pump shoe or anchor body indicated by the numeral This pump shoe is provided with a tapered seat indicated at which is designed to receive the conical lower end 1| of the master standing valve generally indicated at 12. 13 indicates the master standing valve seat with which a ball member indicated at 14 cooperates, the lower end 1| having a vertical passage therethrough below the ball which receives and conducts the mixture from the well upwardly through that portion of the apparatus.

The ball 14 is mounted in a master standing valve blind cage indicated at 15. This cage 15 is exteriorly threaded at its upper end to receive a nipple indicated at 18, the upper end of which is threaded to the lower end of a cylindrical perforated bushing indicated at 11 having a plurality of longitudinal perforations 18 extending through the bushing. The upper end of the bushing 11 is exteriorly threaded to receive the lower end of the pump jacket indicated at 80. The pump jacket 80 is a tube somewhat longer than the pump plunger, valves and the stroke of the pump. The lower end of the pump jacket is threaded to the upper end of the perforated bushing 11 and at its upper end is threaded to the lower cylinder head 2|.

82 indicates a lower standing valve body provided with a stem indicated at 83 which extends downwardly from the body into the central bore of the perforated bushing 11, being threaded or otherwise secured thereto. On the upper end of the perforated bushing 11 is a lower standing valve seat 85 which has perforations 86 coincident with the perforation 18 in the perforated bushing 11. 81 designates a standing valve cage having balls 88 therein which t upon the upper end of the seat at the upper end of the perforations 36 therein.

Threaded to the valve body 82 and extending upwardly therefrom is a pump barrel indicated at 98. This pump barrel extends upwardly to within approximately three-eighths of an inch of the lower end of the lower cylinder head 2|, being free to align itself to the connecting tube of the engine. Secured to the upper end of the lower standing valve body 82 is a blind cage indicated at 9| having a seat indicated at 92 which receives a ball valve member 93. Arranged above the standing valve 82 within the pump barrel 98 is the lower plunger working valve generally indicated at S5 which is provided with a blind cage 96 and a ball valve member 91. The upper end of the lower working valve extends into and threadingly engages a pump plunger barrel indicated at 98, the upper end of which is threaded to the lower end of a blind cage 99 of a pump plunger |80. The pump plunger |00 has slideably mounted therein a plunger tube ll, the upper end of which is threaded into the coupling 38 which is attached to the pump delivery tube 36. The lower end of the coupling 38 is chamfered and is engageable with the upper end of the pump plunger |88, as hereinafter described. The lower end of the pump plunger tube is provided with a head or enlargement H22 which is engageable with the lower end of the pump plunger 8G. The pump plunger tube ||J| is provided with a series of ports indicated at |03 which, as hereinafter described, during a portion of the stroke are exposed to provide open communication from a chamber |84 between the pump plunger |98 and the lower end of the lower cylinder head 2|.

rlhe operation of the apparatus described above is as follows.

It is to be understood that a common form of gas anchor or separator (not shown) is attached in the ordinary manner to the gas anchor plug which is threaded into the lower end of the pump shoe or anchor body and it is also to be understood 'that the tubing is closed at its upper end in the usual manner and gas under pressure introduced into the upper end of the tubing.

The mixture of oil, gas and in some instances water from the well, hereinafter generally referred 'to as oil, enters the apparatus through the master standing valve indicated at 12, the tapered lower end of this valve being seated against the tapered seat 18 of the anchor body Ei, forms a seal so that the high pressure gas cannot mix with the oil at this point, thereby preventing gas except such gas as may be in 'ne oil from passing upwardly through the pump. This oil passes upward through the master standing valve raising the ball valve member 14 and through the master standing valve blind cagev indicated at 15,

As the pump plunger moves upward the lower plunger working valve 91 is closed and it pulls a vacuum in the pump barrel below the plunger, causing the lower standing valve member 93 to leave its seat and the oil in the nipple 16 to be drawn upwardly following the pump plunger in its upward movement, and during this operation the master standing valve 12 opens, drawing oil from the well upwardly to replace the oil above the standing valve ball 93.

As long as the plunger is traveling upwardly this movement of the oil continues upward through both the standing valve and the master standing valve. When the plunger reaches the top of the stroke the balls in both standing valves return to their seats and the oil above the standing valve 12 is trapped.

At the beginning of the downward stroke of the piston 32 the pump plunger tube |0| is moved downwardly in the pump plunger |00 until it assumes the position shown in Fig. 1b, and that is the ports |03 are concealed in the pump plunger |09 thereby preventing any communication during such downward movement between the interior of the pump plunger tube and the space |84 above the pump plunger. During the downward movement of the pump plunger |00 it is to be understood that all oil below the plunger and between the valves 91 and 93 is displaced upwardly through the apparatus to the surface of the ground. DuringA this downward stroke a vacuum isformed in the chamber |04 above the pumpplunger andfbelow the lower cylinder head; This: creates a suction in the annular space between the pump barrel 99. and` the pump jacket 80. The suction. in. this space causes the balls 8 8. to-move oiY their respective seats and oil from below the perforated bushing H to be drawn upwardly through the perforations IB into the space between. the pum-p jacket and the pump barrel following the piston downwardly to the end of its down stroke.

When the piston 32 of the engine starts on its upward stroke the rst movement imparted to any of the pump structure is through the medium of the pump. delivery tube 3B, which being connected to the piston moves. upwardly, imparting movement to the upper plunger coupling 38, which being connected to the upper end of the pump plunger tube moves such tube upwardly exposing the ports |03, and when in such exposed position the head |02 on the tube IDI engages the lower end of the pump plunger-upwardly. This upward movement of the pump plunger causes valves M and 93 to open and valve 91 to close, causing the oil in the chamber |04 above the pump plunger ISI. to be displaced through the ports |03 into the delivery structure and oil in the chamber |04 above the pump plunger passes from such chamber ldinto the discharge tube of the well along with the oil which is passing upwardly from above the valve 91.

The area of the space or chamber |04 from thetop of the plunger to the top of the stroke is less than the area below the plunger but the area of the connecting tube or pump delivery tube 36 is approximately 75% of such area. When theI pump is on the up stroke this smaller portion of oil is handled. This is when the engine has a weight of all the moving parts to lift in addition to the fluid. When the smaller portion of oil is handled the smaller upper area of the engine is exhausted and while a larger volume of oil is being handled on the downstroke, there is no lift of moving parts and thevweight assists in this movement and the greater volume of exhaust gas from below the piston is keeping the gas and oil ratio practically constant, thereby resulting in the engine having an almost perfectly balanced load at all times.

What has been referred to hereinabove as the control unit or engine operates in the following manner.

As hereinabove described, the high pressure gas from a suitable source above the ground enters the upper pressure chamber I5 through the perforations I6 in the upper tube |2. From this upper chamber this high pressure gas passes through the perforations 29 into the space 21 between the inner traveling tube 25 and the outer traveling tube 26. The high pressure gas passes downwardly between these two tubesand intol the chamber 34' in the piston 32. From this chamber the high pressure gas passes through ports 46 into the bores or valve chambers and from such chambers passes through ports 5| and 52 alternately to the opposite ends of the cylinder. Such gas is alternately exhausted from the opposite ends of the cylinder through exhaust ports indicated at 48 so that the piston is reciprocated in the cylinder 20.

Referring to the bumpers 62 and 64, the end of the valve rods contact such bumpers and move the valve rods in the piston to alternately uncover the intake and exhaust ports. The engagement of the valveV rods bythe bumpers force the valve lock 56; open. and. alternately move the valves in the piston.

Although. one form of the invention has been particularly shown and described, it is contemplatedr that various changes and modifications can be made without departing from the scope of.` the invention and it is intended to cover such changes and modications as come within the scope of the claims.

l': claim as my invention:

1'.l In. a well pumping apparatus the combination. of: a power cylinder suspended from the oil discharge tubing of the well; a cylindrical power piston in the power cylinder; means for introducing high pressure fluid alternately to the opposite ends of said cylinder; means for exhausting pressure from the opposite ends of the cylinder into the passage through the piston; means attached to the piston providing an open connection from the passage in the piston to the interior of the oil discharge tubing; a plunger barrel; a plunger in the barrel connected to the piston; means for delivering liquid pumped by said plunger intothe passage in said. piston; a working valve in the lower end of said plunger; a standing valve in. the lower endi of said plunger barrel; a pumpv jacket secured to the lower end of said power cylinder and a standing valve at the lower endV of said pump jacket.

2'.. Pumping apparatus for use in wells having oil discharge tubing within the well tubing, the combination of: a power cylinder adapted to be suspended, from the oil discharge tubing within the well tubing; a cylindrical power piston in the power cylinder; an inner traveling liquid delivery tube secured to .the piston and extending upwardly therefrom in open communication with the oil discharge tubing of the well; an outer traveling tube secured to Said piston spaced apart from the inner traveling tube forming an annular space therebetween.; means for delivering pressure fluid from saidV annular space between the traveling tubes through said piston into said cylinder alternately toopposite ends thereof for effecting reciprocation of said: piston in said cylinder; means for alternately delivering exhaust pressure fluid through said piston from opposite ends thereof into said inner traveling tube; a plunger barrel in said well; a plunger in said barrel connected to said piston and` means for delivering liquid pumped by said plunger into said inner traveling tube.

3. In a pumping apparatus for use in well tubing having oil discharge tubing suspended therein, the combination of an upper tube section having a plurality of perforations therein; means for suspending said rupper tube section from the oil discharge tubing; a power cylinder suspended from the upper tube section; a cylindrical power piston in the power cylinder; an inner traveling liquid delivery tube secured to the piston and extending upwardly in open communication with the oil discharge tubing; an outer traveling tube secured to the piston spaced apart from the inner traveling tube forming an annular space therebetween; said outer traveling tube having perforations therein for the admission of pressure uid into the annular space between the traveling tubes; means for delivering a pressure fiuid from said annular space between the traveling tubes through said piston into said cylinder at opposite ends thereof for effecting reciprocation of said piston in said cylinder; means for alternately delivering exhaust pressure fluid through said piston from the ends 9 of said cylinder into said inner traveling tubes; a plunger barrel in said well; a plunger in said barrel connected to said piston; and means for delivering liquid pumped by said plunger into said inner traveling tube.

4. In a pumping apparatus for use in welll tubing having oil discharge vtubing suspended therein, the combination of: an upper perforated tube section; a head having an opening therethrough attached to the upper end or said upper tube section connecting said section to the lower end of the oil discharge tubing; a power cylinder; an upper head for said cylinder attached to the lower end of said upper tube section; a lower cylinder head attached to the lower end of said cylinder; a hollow piston in said cylinder; an inner traveling tube secured to the upper portion of the piston slideably extending through the top head in open communication with the oil discharge tubing; an outer traveling tube secured to said piston slideably extending through the upper cylinder head and having a series of perforations therein above the upper cylinder head; said traveling tubes being spaced apart forming an annular passage for pressure iluid; means for delivering pressure fluid from said annular space between the traveling tubes through said piston into said cylinder at opposite ends thereof for eiecting reciprocation of said piston in said cylinder; means for alternately delivering exhaust pressure fluid through said piston from the ends of said cylinder into said inner traveling tube; a plunger barrel in said well; a plunger in said barrel; tubular means slideably extending through the lower cylinder head for connecting said plunger to the piston for delivering liquid pumped by said plunger into said inner traveling tube.

5. In a pumping apparatus the combination of: a well tubing; an upper tube section having perforations therein freely suspended in the tubing and spaced apart from the well tubing to form an annular passage therebetween for receiving gas under pressure; a power cylinder suspended from said upper tube; a power piston in said cylinder; a liquid delivery tube in said upper tube section spaced apart therefrom; inner and outer traveling tubes spaced apart to form an annular gas passage therein; the outer tube having perforations therein; said tubes being secured at their lower ends to the piston; the inner tube being open at its upper end into said discharge tube; means for alternately delivering gas under pressure from the annular space between the traveling tubes alternately to the opposite ends of the piston for effecting reciprocation of said piston in said cylinder; means for alternately delivering exhaust pressure fluid from the ends of said cylinder through said piston into the inner traveling tube'; a plunger barrel in said well; a plunger in said barrel connected with said piston; and means for delivering liquid pumped by said plunger into said inner traveling tube.

6. In a pump apparatus for use in wells having a well tubing and macaroni suspended in said well tubing, the combination of an upper tube section secured to the macaroni; said upper tube section being perforated and spaced apart from the well tubing to form an annular passage therebetween for receiving gas under pressure; a power cylinder suspended from said upper tube section; a power piston slideably mounted in said cylinder; a liquid discharge tube in said upper tube section having its upper end in open communication with said macaroni; said liquid discharge tube being spac'ed apart from said upper tube section to form a gas chamber; inner and outer traveling tubes spaced apart to form an annular gas passage therein; the outer tube having perforations therein; said tubes being secured at their lower ends to the piston; the inner tube being open at its upper end into said discharge tube; means for alternately delivering gas under pressure from the annular space between the traveling tubes alternately to the opposite ends of the piston for eiecting reciprocation of said piston in said cylinder; means for alternately delivering exhaust pressure iluid from the ends of said cylinder through said piston into the inner traveling tube; a plunger barrel in said well; a plunger in said barrel connected with said piston; and means for delivering liquid pumped by said plunger into said inner traveling tube.

'7. In a pumping apparatus :foruse in well tubing, the combination of a power cylinder adapted to be suspended in and spaced apart from the well tubing;` a cylindrical power piston in the power cylinder; an inner traveling tube secured to said piston spaced apart from the inner traveling tube forming an annular space therebetween; means for delivering pressure fluid from said annular space between the traveling tubes through said piston into said cylinder at opposite ends thereof for effecting reciprocation of said piston in said cylinder; means for alternately delivering exhaust pressure fluid through said piston into said inner traveling tube; a plunger barrel in said well; a plunger in said barrel connected to said piston and means for delivering liquid pumped by said plunger into said inner traveling tube.

8. In a well pumping apparatus the combination of: a power cylinder suspended from the oil discharge tubing of the well; a cylindrical power piston in the power cylinder; means for introducing high pressure fluid alternately to the opposite ends of said cylinder; means for exhausting pressure fluid from the opposite ends of the cylinder into the passage through the piston; means for providing an open connection from the passage in the piston to the interior of the oil discharge tubing; a pump jacket suspended from the lower end of the power cylinder; a plunger barrel in said pump jacket spaced apart therefrom to form an annular oil receiving passage; said oil receiving passage being in open communication with the interior of the plunger barrel at its upper end; a plunger in said plunger barrel; a working valve mounted on the lower end of the pump plunger; a valve at the upper end of said plunger comprising a pump plunger blind cage secured to the pump plunger; a plunger tube slideably extending through said pump plunger; said tube having a plurality of ports normally closed within said pump plunger blind cage; tubular oil receiving means connected to said piston; coupling means engageable with the upper end of the pump plunger connecting the upper end of said pump plunger tube to said tubular means; a head on the lower end of the pump plunger tube engageable with a shoulder on the pump plunger blind cage; a standing valve in the lower end of said plunger barrel; a perforated bushing attached to said pump jacket; an open cage at the upper end of said bushing; a ball valve in said cage for each .perforation in the perforated bushing; and a lower standing valve supported from the lower end of the pump jacket below the perforated bushing.

9. In a well pumping apparatus the combination of: a power cylinder suspended from the oil discharge tubing of the well; a cylindrical power piston in the power cylinder; means. for introducing high pressure uidralternately to the opposite ends of said cylinder; means-for exhausting pressure iiuid from the opposite ends of the cylinder into the passage through the piston; oil delivery tubing attaching to said pistonextending upwardly therefrom in open communication with the oil dischargetubing; a pump jacket suspended from the lower end of the. power cylinder; a plunger barrel in said pump jacket having its upper end spaced apart from the lower end of the cylinder.; saidplunger barrel being spaced apart from the Apump j acket, to form` an, annular oil receiving passage therebetween; a working valve mounted on the lower end of the pump plunger; a valve at the upper end of said plunger comprising a pump plunger blind cage secured to the pump plunger; a plunger tube slideably extending through said pump. plunger;v said tube having a plurality of ports normally closed within said pump plunger blind cage; tubular-V oil receiving means connected to said piston ;v coupling means engageablewith the upperend of the pump plunger connecting the upper end. of said pump plunger tube to said tubular means; a head on the lower end of the pump plunger tube-engageable with a shoulder on the pump. plunger blind cage; a standing valve in the lower end of said plunger barrel; a perforated bushing attached to said pump jacket;` an open cageat the upper en d of said bushing;` a ball valve in said cage for each perforation in the perforated bushing; and a lower standing valve supported from the lower endofrthepllmp jacket-below the perforated bushing.

HUGH S. BERKEY.

REFERENCES CITED The following references are of: record in the le of this patent:

STATES PA'IENTS Number. Name Date 5775545 Williams Feb. 23, 1897 1,868,374 Berkey July 26, 1932

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