US2074486A - Multiple tube pump - Google Patents

Description

March 23, 1937. c. M. PETERS -MULTIPLE` TUBE PUMP Filed May 1, 1956 A JW/w/a/ Jaffa/v0 Patented Mer. 23, 1937 UNITED STATES PATENT OFFICE MULTIPLE TUBE PUMP Clifford M. Peters, El Dorado, Ark.

Application May 1, 1936, Serial No. '17,368

4 Claims.

This invention relates to pumps having reciprocable plungers in which the seal between the plunger and the pump cylinder or barrel, is effected by a plurality of telescoping sleeves, this type of pump being particularly adapted for deep well pumping, as in the oil fields, where pumping, for economical reasons makes it advantageous to use casings, cylinders and discharge pipes of small diameter.

The primary object of the present invention is to make a pump of this type which is double acting and in which the effective discharge volume will be largely increased over other pumps of this type, and which will as nearly as possible reach a maximum capacity in a pump of 30 the accompanying drawing, in which,-

Fig. 1 is a sectional elevation of the upper portion of my improved cylinder and plunger; and

Fig. 2 a similar section of the lower end of 35 the same cylinder and plunger, it being understood that between these a considerable portion of the usual length of the tubes has been omitted.

Fig. 3 is a similar section of a modified form of the lower end of the pump, usable with the upper end shown in Fig. 1.

Fig. 4 is a section taken on the line IV-IV of Fig. 3.

Referring now to the drawing in which the various parts are indicated by numerals; III is 45 a well tubing, to the lower end of which is se- 55 threaded joint. to a standing valve body I5, to

which body the inner tube I4 ls also secured as by threading. The upper end of the tube I4 has externally secured thereto as by welding, a sleeve I6 to which sleeve the tube I3 is similarly secured, and from which sleeve the tube I3 depends between the barrel I2 and tube I4. Secured to the lower end of the valve body I5 as by threads is a valve seat member I1. Supporting this seat member, is a tapered plug I8, which is adapted to be supported by a tapered seat I9 in the shoe II, the joint between the tapered plug and its seat I9 cooperating to form an effective seal. ls a ball valve which cooperates with the seat I1 to form a standing valve, the ball being limited in its movement as by a transverse pin 2 I. 22 are openings through the tube I4 adjacent its lower end giving free communication into the lower pump chamber 23 between the barrel I2 and tube I 4.

The pump plunger comprises a head 25 having a central opening 26 therethrough, the up- Aper end of this head forming a seat for a ball valve 21, the head 25 and ball 21 forming a travelling valve. Secured to the upper end of the head 25, as by threading, is a cage 28 for the valve 21, the upper end of this cage having a threaded shank 29 to which the sucker rod 3U is secured. Secured to the head 25 as by threads and depending therefrom within the barrel I2 is an outer plunger tube 3 I. At the lower end of this tube a spacing sleeve 32 is inserted and secured as by welding, and to this sleeve is secured an inner plunger tube 33, which extends upward between the tubes I3 and I4 of the cylinder assembly. The lower end of the plunger formed by the tubes 3l and 33 and the interposed sleeve 32, forms an annular plunger which is moved upward and downward during pumping in the annular space or chamber 23 of the cylinder. Between the lower end of the cylinder tube I3 and the sleeve 32 is an annular chamber 35, and similarly between the tubes I3 and I4 of the cylinder, an annular chamber 36 is formed, both the chambers and 36 decreasing on the up stroke of the plunger, and increasing on the down stroke thereof. At the upper end of the standing tubes is an upper pump chamber 31 which is supplied through the center passageway 38 of the standing tube I 4.

In the modified form shown in Figs. 3 and 4 the well tubing IIIA has secured at its lower end the shoe IIA which may be formed as before with a tapered seat, but which preferably is formed with an annular shoulder 40 on which is seated a sealing ring 4I which in turn supports and is compressed to form a seal by an annular -iiange 42 on the pump assembly. The cylinder assembly of the pump comprises as before, a barrel tube I2A, an inner tube I4A which latter 5 tube is a continuation of the tube I4 of Fig. 1, and as before, supports the third tube I3 of the same ilgure. Cooperating with the tubes I2A, I3 and IIIA are plunger tubes 3l and 33 identical with those before described. 43 is a tubular member preferably forming a continuation of the ybarrel tube I2A. For purposes of construction thek barrel tube I2A has been internally offset at its lower end -to form a depending sleeve 44 of reduced diameter which is exteriorly threaded and engages with interior threads on the upper end of the tube extension 43 to support the latter. The tube 43 is exteriorly enlarged to form the flange 42 hereinbefore mentioned and by means of which flange the cylinder=assembly is supported. At its lower end the tube 43 carries a standing valve preferably comprising a valve body 45 and cooperating ball valve 46. 22A are openings through the inner tube I4A into the chamber or space 23A between the inner and out- 25 er tubes I4A, I2A. Disposed within the outer tube 43 is an auxiliary standing valve of generally tubular form which comprises a. tube 58 secured to the lower end of the tube I4A as by threads and depending therebelow. In the lower end of this tube is secured as by threading, a valve body 5I, which forms a seat for-a ball valve 52. Disposed between the tube 50 and the tube 43 are oppositely disposed hub members 53 which may be integral with both the tube 58 and the tube 43, or may be secured to one or both thereof as by welding. Extending radially outward through the tube 50 and the hubs 53 and the tube 43 are passageways 54 which establish communication from the interior of the tube 50 to the exterior of the tube 43 into an annular passageway 55 in the shoe IIA and thence upward through the passageway 56 between the outside of the tubes 43-I2A and the interior of the tubing IDA. Immediately above the passageways 54 is a diaphragm or plug 51 sealing off the lower end of the inner tube I4A. 58 is a transverse pin limiting movement of the ball 52.

In constructing both forms of the device, I make use of cold drawn seamless steel tubes of .020 inch clearance separating each tube from its adjacent tube, the longer ones of these tubesl'under usual conditions being about 18 feet in length. By such construction I set up through 55 the skin friction of the liquid pumped the necessary resistance to leakage, and am enabled to dispense with the accurate machine work otherwise necessary to secure close fits. Such greater clearance also largely reduces the wear due to sand in the liquid being pumped and greatly extends the useful life of the pumps. The plunger tube assembly and the cylinder tube assembly are brought together in working relation and are then secured to their respective valve bodies accompllshing an interlocked plunger-cylinder pump which may be lowered as a unit into the well, or removed therefrom.

In using either form of the pump the interlocked structure is secured to the sucker rod 30 and by means of the sucker rod is lowered through the tubing I0 until it comes to rest on the seat provided therefor in the shoe at the lower end of the tubing. Thereafter the sucker rods are connected to a usual or desired form of operating mechanism and pumping may be begun.

In the forms shown in Figs. l and 2, on the up stroke the fluid is drawn in through the standing valve I1-I8, and into the lower pump chamber 23, the bore 38 of the tube I4 and the upper pump chamber 31 which is at the upper end of the standing tube |3-I4. On the down stroke of the pump the standing valve I1-I8 closes and the fluid trapped in the lower chamber 23, and in the upper chamber 31 is discharged through the travelling valve 2li- 21, it being noted that the discharge volume is the sum of the inner area of the plunger tube 3| and the annular area of the chamber 23, multiplied by the length of stroke. The displacement volume not only being greater than the ordinary displacement volume by reason of the greater area of the upper displacement chamber 31, but in addition to this being augmented by the displacement volume of the lower annular chamber 23, the area of this latter chamber being a surprisingly large proportion of the total interior area of the outer standing tube or pump barrel. As an example, in a typical construction in which the pump is designed to be run in in a well having 21/2 inch tubing the outside diameter of the standing tube or pump barrel is held under usual practice to 2% inch. With the tubing used by me, the outside diameter of each additional tube is reduced 1A inch. The interior diameter of the upper pump chamber is therefore 1% inches or an area of 2.405 inches. The annular area of the lower pump chamber is 3/1416 inch less the exterior area of the standing tube I4 which is 11A inch in diameter, this leaving a net area of 1.915 which added to the area of the upper chamber gives an eiective area of 4.321 inches to be multiplied by the length of stroke in determining the pumping volume, such pumping area and volume being largely in excess of any type of multiple tube pump heretofore known.

In the form shown in Fig. 3 on the up stroke fluid is drawn into the pump through the lower standing Valve 45-46, and upward past the auxiliary standing valve 5l-52 into the pump chamber. On the down stroke the travelling tubes 3I-33 discharge iluid so drawn in,through the openings 22A and the passageway exterior to the tube 50 against the lower standing valve 45-46 and thence upward through the auxiliary standing valve 5I-52, and outward through the passageways 54 into the passageways 55-58 which lead upward within the tubing I0, and at the same time the standing tubes I3I4 acting on the upper chamber 31 of Fig. l, force the liquid within such chamber upward through the travelling valve 26-21 and discharge this uid through the case 28, likewise into the tubing I0, the eiective pumping displacement being the same as before.

In this latter type of pump should the pump acceleration be excessive, fluid held in the pressure release assembly by the lower standing valve will raise the auxiliary standing valve and escape through the passageways 54 into the tubing. 0n the up stroke this latter valve will immediately close holding the fluid in the tubing. ..1Also, since on downward movement of the plunger flow is through the passageway 54 directly into the bottom of the tubing, sand will effectively be prevented from settling, thereby keeping the pump from silting up between the outside of the tube assembly and the inside of the tubing.

At any time the entire pump assembly may be withdrawn from the well, as for inspection and/or repair, by withdrawing the sucker rod 30.

What I claim is: LInapiunphavingadischargepipewith an annular seat adjacent its lower end, a cylinder assembly and a plunger assembly reciprocably cooperating; said cylinder assembly including an annular head adapted to be removably supported 1 by said seat, said head including a standing valve discharging upwardly, two spaced and concentric standing tubes secured to said head and extending upwardly therefrom, an annular spacer secured andsealed around the upper end of the inner of said tubes and a shorterstanding tube disposed intermediate said two standing tubes, secured and lsealed to said spacer and depending therefrom; said plunger comprising an annular head, carrying a travelling valve discharging upwardly, a travelling tube secured to said head and depending therefrom, between and having a` working iit with the outer and intermediate ones of said standing tubes, an annular spacer secured within fand sealed to said travelling tube at the lower end thereof, and a shorter-travellingtube secured within and sealed to said spacer, said shorter tube extending upward betweenV said inner and inter- .mediate standing tubes and" having a working t with both thereof, the lower end of said two travelling tubes and the spacer therebetween fafming an annular plunger in the annular chamber between the said inner and the outer.

having openings Aestablishing free communication from said chamber into the bore of said inner standing tube. v 2. In a pump, a discharge pipe, a cylinder as- 3" sembly and a plunger assembly reciprocably cooperating; said cylinder assembly comprising an annular head supported by said discharge pipe, said head including a standing valve discharging upwardly. two spaced and concentric standing wardly therefrom, an annular spacer secured and sealed around the upper end of the inner. of said tubes and a shorter standing tube disposed intermediate said two standing tubes, secured and s ealed to said spacer and depending therefrom; said plunger comprising an annular head. carrying a travelling valve discharging upwardly, a travelling tube secured to said head and depend, ing therefrom, between and having a working ilt with the outer' and intermediate ones of `said standing tubes, an annular spacer secured within and sealed to said travelling tube at the lower end thereof, and a shorter travelling tube secured within and sealed to said spacer, said shorter tube extending upward between said inner and intermediate standing tubes and having a working fit with both' thereof, the lower end of said two travelling tubes and the spacer therebetween forming an annular plunger in the annular chamber between the said inner and the outer of said standing tubes, said inner standing tube having openings establishing free communication from said chamber into4 the bore of said inner standing tube.

of said standing tubes, said inner standing tube tubes secured to said head and extending `upannular seat adjacent its lower end,- a cylinder assembly and a reciprocably cooperative plunger assembly; one said assembly including three uniformly spaced concentric tubes, and the other assembly two tubes nesting and having a working nt with said three tubes. ahead secured to contiguous ends of the outer and inner of said three tubes and sealing the annular space between said tube ends, means securing together the opposite ends of said inner tube and the intermediate of said tubes andsealing the annular space between said ends, a head secured to the outer of said two tubes at the end remote from said rst, head, means secured to the opposite endsofsaidtwotubesandsealingtheannnlar space between said ends. said heads each having an opening therethrough and a one way valve closure therefor, and both of said closures opening upward; one-of said heads being securable 4at its upper end to a pump sucker rod, and the other thereof having supporting means adapted to seat on said annular seat. A

4. In a pump having a discharge pipe with an annular seat adjacent its lower end, a cylinder assembly and a plunger assembly reciprocabiy cooperating, said cylinder assembly comprising a head adapted to be supported by said seat, two spaced standing tubes secured to said head and extending upwardly therefrom, the inner of said tubes having openings therethrough adjacent said head, and having an annular spacer secured and sealed around its upper end, and a shorter standing tube disposed intermediate said iirst tubes, secured and sealed to said spacer and depending therefrom; said head having an upper portion forming a closure for the lower ends of said inner and outer standing tubes, and concentric annular downward extensions therefrom, said extensions each carrying a standing valve discharging upward, said upper head portion being apertured to establish a passageway from the inner of said extensions above its said valve into said `well tubing, and being independently apertured to establish connection from the outer of said extensions above its said valve into the space between said inner and outer standing tubes; saidplunger comprising a head carrying a travelling valve discharging upwardly, a travelling tube secured to said head and depending therefrom, between and having a working nt vwith the outer of said standing tubes and said n and having a working iit with both thereof, the

lower end of said travelling tubes and spacer forming an annular plunger cooperating with walls of said inner and outer standing tubes.

ormoni) M. PETERS.

. 3. amapumphavingadischargepipewithan

Images