US2787964A - Sectional liner pump - Google Patents

Description

April 9, 1957 E. E. STEVENSON 2,787,954

SECTIONAL LINER PUMP Filed Oct. 8, 1952 2 sheets-sfieet 1 n 1 N Z W 0 0 9 6 0 M w 7. H mag X 6% f 1 E. A a w J g E I W Fv .ll AN 1; a

April 9, 1957 E. E. STEVENSON SECTIONAL LINER PUMP 2 She ets-Sheet 2 Filed Oct. 8, 1952 United States P n M SECTIONAL. PUMP Edward E. Stevenson, Whittier, Califi, assignor to United States Steel Corporation, a corporation of New Jersey Application October 8,1952, Serial No. 313,638

3 Claims. (Cl. 103181:)

This invention relates to improvements in. liners for subsurface pump barrels.

One type of subsurface pumpused in oil wells and the like includes a stationary barrel inserted in the well tubing, which contains a shoe on which the barrel seats. The barrel can be designed so that either its bottom portion or its top portion engages the shoe, but the former has the disadvantage that sand can pack in the annular space between the barrel and the tubing, making removal of the pump difficult. In both arrangements the downstroke of the plunger places the full load of the fluid head in the tubing on the standing valve, which is closed. In a top-seated barrel this load, which may be several thousand pounds, stretches the barrel walls. Some pump barrels have liners of wear-resistant material, such as the boron-containing cast iron sold under the trademarks Di-Hard or I-R Metal, and in larger sizes these linings are sectional. Previous sectional liners with which I am familiar cannot withstand such stretch without their sections becoming misaligned. Since these pumps are precision instruments, any'misalignment causes early failure. Consequently for sectional liner barrels it has been necessary to resort to the otherwise less desirable bottom-seating.

An object of the present invention is to provide improved sectionau liners which enable a pump barrel to be top-seated without stretching its liner nor tending to misalign the sections.

A more specific object is to provide improved sectional liners which include a cylindrical jacket fixed to the pump barrel at one end and floating at the other end and liner sections mounted within said jacket.

In accomplishing these and other objects of my invention, I have provided improved details of structure, preferred forms of which are shown in the accompanying drawings, in which:

Figure 1 is a vertical sectional view of the upper portion of a subsurface pump in which the barrel liner is constructed in accordance with one form of the present invention;

Figure 1a is a continuation of lower portion of the pump;

Figure 2 is a vertical sectional view of the upper portion of a subsurface pump in which the barrel liner is constructed in accordance with a modified form of the present invention; and

Figure 2a is a continuation of Figure 2 showing the lower portion of the pump.

Figures 1 and la show well tubing which contains a seating shoe 12 formed in the coupling between two of its sections. A subsurface pump is mounted within said tubing and includes a stationary barrelformed of a liner hereinafter described and an outer shell 13. The upper end of said shell is joined to a seating body 14 which is seated in the shoe 12. A rod guide 15 is fixed to the top of the seating body 14, and a reciprocable rod string 16 extends through said rod guide to the sur- Figure 1 showing the ICE face for motivating the pump. The lower end of the rod string is fixed to a reciprocable plunger 17 which carries a traveling valve 18. The lower end of the shell 13' carries a standing valve 19. Apart from the novel liner, pumps of this general construction are well known, so that no more detailed description of its structure or operation is deemed necessary.

In accordance with the embodiment of my invention shown in Figures 1' and 1a, the. liner includes a cylindrical' metal jacket 20', the upper end of which is threadedly joined to the seating body 14. The lower end of the jacket 20 carries a nut 21 threadedly engaged therewith. A plurality of accurately aligned Wear-resistant liner sections 22 are mounted within the jacket 26 and are clamped between the top of the nut 21 and the bottom of the seating body 14. The lower end of the liner is free or floating with respect to the shell 13', and consequently any stretch in the shell is not transmitted to the liner.

Figures 2 and 2a show a modification in which the liner is joined to the lower end of the shell and is free at its upper end. The standing valve 19 carries a connector 23 to which the lower end of the liner jacket 20a is threadedly engaged. The upper end of this jacket carries a nut 21a which fits closely within the shell 13. The liner sections 22a are clamped between the bottom of this nut and the top of the connector 23. To prevent entry of sand in the space between the jacket 20a and the shell 13 of the pump barrel, the exterior of the nut 210 preferably carries an O-type packing ring 24 which slidably engages the interior of the shell but leaves the upper end of the jacket floating with respect to the shell.

From the foregoing description it is seen that either embodiment of my invention leaves the liner free of stresses that stretch the pump barrel. Consequently the barrel can be top-seated in the tubing Without danger of such stresses misaligning the liner sections.

While I have shown and described only certain preferred embodiments of my invention, it is apparent that modifications may arise. Therefore, I do not wish to be limited to the disclosure set forth but only by the scope of the appended claims.

I claim:

1. The combination, with a well tubing which has a seating shoe spaced above its lower end, of an insert pump removably received in said tubing and including an annular seating body removably resting on said shoe, a depending barrel shell fixed to said seating body for removal therewith and being free of said tubing, a standing valve mounted on the lower end of said shell, a jacket Within said shell, means fixing one end of said jacket with respect to one end of said shell, the other end of said jacket being floating with respect to said shell, a plurality of tubular liner sections of harder material than said jacket fitted therein in end-to-end abutting relation, means fixed to the floating end of said jacket and cooperating with said first named fixing means to clamp said liner sections within said jacket, a reciprocable element within said liner sections, a traveling valve carried by said reciprocable element, and means sealing the upper end of the space between the shell and jacket from access to the interior of said tubing.

2. The combination, with a Well tubing which has a seating shoe spaced above its lower end, of an insert pump removably received in said tubing and including an annular seating body removably resting on said shoe, a depending barrel shell fixed to said seating body for removal therewith and being free of said tubing, a standing valve mounted on the lower end of said shell, :1 jacket within said shell, means fixing the upper end of said jacket to said seating body, the lower end of said jacket being floating with respect to said shell, a plurality of tubular liner sections of harder material than said jacket fitted therein in end-to-end abutting relation, a nut fixed to the floating lower end of said jacket and cooperating with said seating body to clamp said liner sections within said jacket, a reciprocable element within said liner sections, and a traveling valve carried by said reciprocable element, said seating body constituting means sealing the upper end of the space between the shell and jacket from access to the interior of said tubing.

3. The combination, with a well tubing which has a seating shoe spaced above its lower end, of an insert pump removably received in said tubing and including an annular seating body removably resting on said shoe, a depending barrel shell fixed to said seating body for removal therewith and being free of said tubing, a standing valve mounted on the lower end of said shell, a jacket within said shell, means fixing the lower end of said jacket to the lower end of said shell, the upper end of said jacket being floating with respect to said shell, a

plurality of tubular liner sections of harder material than said jacket fitted therein in end-to-end abutting relation,

a nut fixed to the floating upper end of said jacket and cooperating with said first named fixing means to clamp said liner sections within said jacket, a reciprocable element within said liner sections, a traveling valve carried by said reciprocable element, and a seal between the outside of said nut and the inside of said shell sealing the upper end of the space between the shell and jacket from access to the interior of said tubing.

References Cited in the file of this patent UNITED STATES PATENTS 1,546,329 Uhl July 14, 1925 1,578,720 Derby Mar. 30, 1926 1,702,619 Sargent Feb. 19, 1929 2,138,002 Hall Nov. 29, 1938 2,220,821 Mancuso Nov. 5, 1940 2,300,648 Carlberg Nov. 3, 1942

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