US2358974A

US2358974A - Pumping unit

Info

Publication number: US2358974A
Application number: US479365A
Authority: US
Inventors: Henderson Bee
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-04-07
Filing date: 1943-03-16
Publication date: 1944-09-26
Anticipated expiration: 1961-09-26

Description

P 1944. A B. HENDERSON I 2,358,974

PUMPING UNIT Original Filed April 7, 1941 3 Sheets-Sheet l Inventor 7 ,Bee lyenafersa zz/ Sept. 2 1944.

HENDERSON PUM ING uni'r Originl Filed April '7, 1941 3 Sheets-Sheet 2 Inventor Bee f/eza rsow v Sept. 26, 1944. B. HENDERSON 2,358,974

PUMPING UNIT Original Filed April 7, 1941 5 Sheets-Sheet 3 i I @i I :EI. 5 li 1 i g l 44} 4 I A (I: l a 7 I o r /2 6. I Irwektor Patented Sept. 26, 1944 PUMPING UNIT Bee Henderson, Dryden, Tex.

Original application April 7, 1941 Serial No. 387,304.- Divided and this application March 16, 1943. Serial No. 479,365

2 Claims.

My invention relatesto improvements in well pumping means of the type featured in' my copending application, Serial No. 387,304, filed April '7, 1941, now Patent No. 2,316,429, and of which the instant application is a division.

The principal object of the instant invention is to provide an inverted cylinder pumping unit .designed for operation by a cable, as a power transmitting medium, instead of rods, and which utilizes the weight of the liquid being pumped for returning the pumping pistons, is simplein construction and highly efficient in operation' Other objects and advantages, together with the precise nature of my improvements, will be readily understood when the succeeding description and claims are read with reference to the drawings accompanying andforming part of this specification. c

-In said drawings:

Figure 1 is a view in vertical section of th lower part of a well casing and the upper and lower portions of my improved pumpin unit.

7 Figure 2 is a similar fragmentary view drawn to an enlarged scale.

Figure 3 is another similar fragmentary view taken through the lower portion of the well casing and pumping unit anddrawn to a further enlarged scale.

Figure 4 is a view in transverse section taken on the line 4-4 of Figure 1 and drawn to an enlarged scale.

Figur 5 is a similar view taken on 5-5 of Figure 1.

Figure 6 is a view in perspective of one of the compression cup dividers drawn to an enlarged scale, and w Figure 7 is a fragmentary view in side elevation the line of the compression cup holder of the lower portion of the unit.

Reference being had to the drawings by numerals, the well casing 5, according to my invention, has threaded thereon a tapering, tubing compression cup holder 6 at the lower end thereof against which bears the bottom compression cup 1 which is tapered in conformity with the cup holder-6 and engages the lower end of the casing 5. The compression cup 1 spacedly surrounds a beveled annulus 8 engaging the lower end of the lower pump cylinder, designated 9, and rests on the horizontal flange H] of said cup I, as best shown in Figure 3. The flange l rests on a beveled lateral annular flange ll formed on the lower end of the compression cup retainer l2 which is threaded into the lower end of the lower barrel 9 of thepump.

The upper end .ofthe ;-lowerpump-barrel 9 is threaded on the lower part of the splicetsleeve 13 on whose upper part is threaded the slotted tubing I4 provided with the circumferentially spaced, vertically elongated openings 15. The upper end of the slotted'tubing I4 is threaded on the lower part of the divider I 6 on whose upper part is threaded'the lower end of the upper barrel I! of the pumping unit. v I The parts 18, 19,10 and 2| comprise means for anchoring the pumping unit in the well casing 5 against upward movement therein while allowing downward movement thereof inv said casing and need merely be identifiedin passing. 7 t

The operating cable 22 depends through the well casin from the surface machinery, not shown, and passes downwardlythrough the upper'end of the-upper barrel. l1, said cable being connected at its lower end in the opening 23 in the upper part of the invertedcup-shaped member 24 which'forms thetop of the upper pumping cylinder, generally designated 25,- and which is threaded into the skirt of the element 24, as shown in Figure 2. The upper pumping cylinder has a Verticallymovable spool-check 26 therein, the bottom of the said cylinder being pros} vided with a relatively large opening 21- tapped bya seat 28 with which the spool check 26 is adapted to engage in its depressed position to close the opening '21. The lowerv part ofthe vpumping cylinder 25 has a lateral annular flange 29 above which are stacked several sets of-compression cup dividersv 30 and compression cups 3| which slidably engage the interior wall of the upper barrel l1. I a

Threaded into the-depending portion of the compression cup retainer flange His-the upper end of the valve holder 32whichis in the form of a cup providing a chamber below'th bottom of the pumping cylinder 25 for Operation of another spool check valve 33 which, in its depressed position, rests on a seat 34 formed around the upper end of an axial-opening 35 provided in the bottom of the holder 32, into the lower part of which opens the upper end of a relatively'small diameter tube 36 threaded into said holder. The holder 32 is provided with; circumferentially spaced radial openings 31 in the side wall thereof. A similar but more elevated opening 26' is provided in the side wall of the'upperpumping cylinder 25. The aforesaid tub 36 slides downwardly through an axial opening 38in the divider l6 and through compression cups and retainers formed in a unit 39 and attached to the lower end of the divider l6 within the slotted tubing M.

The lower end of the said tube 36 is threaded into the hole 40 in the center of an inverted cupshaped upper element 4| of the lower pumping piston designated 42. The skirt of the element 4| is threaded on the upper end of the compression cup holder 43 which is relatively large in diameter and tubular in form-and is-.provided on its lower 'end with a lateral annular flange 44 exteriorly beveled, as indicated by numeral 45. The flange 44 supports above it, on the exterior of the compression cup holder 43, a series of compression cup dividers 46, and compression cups 4'! which engage the interior of the lower cup barrel 9 above the compression cup retainer ing unit 42 through the openings l5 in the element l4, which is the full pressure of the liquid in the tubing 5, forces the lower pumping unit and hence the upper pumping unit downwardly. This creates a pressure in the chamber 50 which forces the spool check 33 to seat, or close, and forces the spool check valve 26 to an open position, thereby permitting liquid in .the chamber 50 to flow outthrough the opening 26' in the upper pumping cylinder and into the chamber 52 which is exposedto the liquid in the tubing 5. Thus, the liquid is forced upwardly through l2 at the lower end of the lower'pumping barrel 9.

The construction and arrangement of parts described above define chambers 50 and =5! located above and below the divider l6, respectively, with'in 'the' lower partof the upper pump barrl I -l, land the chamber --de'fined within the -*upper bar-rel f! above the upper pumping piston and directly exposed to the tubing pressure is generally designated 52, while the chamber '53 above the'lowe'r pumping piston 42 and 'below theiliv-i cl'er "Ili-is generally -designa'te'd53, and is also=dire'ctly exposed to thetubing pressure.

It will be noted t'hat 'the unit is of acne-piece solidconstruction which can be lowered into or miilled out of 'the wll without pulling the tubing. "Asan incideritto lowering of the unit into the bottom of the we1l,'-the compression cup arrangement I, 33=fit-s lrito'an'd seals the opening in the compression cup holder 6, so as to prevent any pn the-npperpump'ing cylinder, when said cable is pulled upwardlygall'of the described connected elements are pulled upwardlywith respect to the upper and lower pump barrels l1 and 9 and thereby provide for passage of the liquid from "the well "into thechamberjSO. 'T-hedivider I6 is so arranged that "a downward pressure is created blowi't in the lower pumping barrel 9 on the upstroke of th'e cable so as to cause a downward pressure toforce the working parts of the unit downwardly after the surface powerfhas pulled the same upwardly and-let go.

As*'the-'cable 22:pul1sitheinnermoving parts of the unit upwardly, liquid is 'forced out of the chamber 53 through the-openings f5 in the slotted tubing 1 4 into the space 54 between the pumping unit and the wll *casing 5. As the movement'starts/the check spool 26 in the upper pumping cylinder seatsso 'asto close the opening 21 and thereby create' a'vacuum in the chamber 50. :As' the movement continues upwardly, pull- :ing'liquid through the bore of the tube 36, the spool-check 33 "is forced upwardly and unseated, thereby permitting the chamber'50 to "fill. The compression cup assembly 3 9 seals "the tubing "36 so that liquid -in the chamber :53 cannot reach the chamber 50. These conditions obtain until the upper and lower pumping units have been pulled t'o theztop of thelstroke. As the surface machinery rreleases the tension on the cable 22, the Ifluid pressure exerted on the lower pun'zpthe tubing.

It may be explained, at this point, that the previously identified anchoring means are constructed'and arranged so that when the unit is being removed from the tubing, the upper pumping cylinder 25 releases the anchoring means, thereby releasing the unit as a whole for movement relative to the tubing 5, so that the entire un'it c'an b'e hoisted or p'ulled out of the tubing -5,' "as occasiommay "require.

' 'The foregoing will, it is-believ'ed, suflice to'irnpart a clear understanding of 1 my invention without further explanation.

'Manif'estlygthe invention, as described, is suscepti bl'e of modification without departing from "the inventive concept, and right is herein re- 's'er-ved to such modifications as -fall within the scope of the appended claims;

What-I claimiis:

1. In "a 'wel'l'pumping unit including a casing, an'elonga'ted barrelinthe lower'part'of'the cas- :ing spaced th'erefrom to form an annular space between said ca'sin'g and barrel, both endso'f the barrel b'eingo'pen, a divider dividing the barrel into 'upper and lower chambers, an upper piston in the upper chamber, a lower piston 'in thel'ower chamber, the bottom of the *lower piston being openymeansfor closing the lower end of the annular space, packing means between each piston and the barrel, a valve cage connected. with the lower end -of the upper piston and having holes therein communicating the interior-"5f the cage withthe upper chamber, theupper piston havin'g operfings therein-Tor communicating the-upper portion thereof with the upper end of the"barrel and said upper piston having arr-opening in its lower en'd communicating the piston with the cage, a downwardly closing valve in the upper piston controlling the opening. in the bottom thereof, a tube connecting the lower end of the cage with the upper end of the lower piston for the passage of fluid from the lower piston into the page, a downwardly closing valve in the cage for controlling communication between the interior of the cage and the tube, means connected with the upper end of the upper piston for moving the two pistons and the tube upwardly, the barrelhaving openings therein below the divider for admitting fluid from the annular space into the lower chamber to cause pressure of the fluid to act upon the lower piston to lower the piston assembly when said-means'is slackened.

2. In awell'pumping unit including a casing, an elongated "barrel in the lower part of the casing spaced therefrom to 'form an annular space between the casing and barrel, both ends of the barrel being open, 'a divider dividing the barrel into upper and lower chambers, an upper piston in theupper chamber, alower piston in the lower chamber, "the bottom of the lower piston being onemmea'ns for "closing the lower end of the annular space, a valve cage connected with the lower end of the upper piston and communicatthe passage of fluid from the lower piston into the cage, a downwardly closing valve in the cage for controlling communication between the interior of the cage and the tube, the barrel having openings therein below the divider for admitting fluid from the annular space into the lower chamber to cause pressure of the fluid to act upon the lower piston to lower the piston assembly. BEE HENDERSON.