US 3822970 A
Description (OCR text may contain errors)
llnited States Patent 1191 Smith et a1.
[ 1 SINGLE OR MULTIPLE STAGE BOTTOM HOLE WELL PUMP  Inventors: E. D. Smith; Robert C. Knight, Denver, C010.
 Assignee: Super-Macey Enterprises, Inc.,
Colorado Springs, C010.
 Filed: Feb. 19, 1970  Appl. No.: 12,719
52 us. 01. Q. 417/552  1 llnt. Cl. F041) 21/02  Field of Search 417/259-262, 417/552, 455, 554; 251/120; 137/331, 533.17
 References Cited UNITED STATES PATENTS 433,019 7/1890 Morris 92/169 753,828 1/1904 Hann 137/5333] 1,388,602 8/1921 Rotteleur 417/261 1,640,408 8/1927 House 137/533.17 1,943,276 1/1934 Miller 137/331 2,006,592 7/1933 Freeman 417/261 2,053,917 9/1936 Mowrey 417/554 2,643,090 6/1953 Cluphf 417/552 A V W July 9,1974
Primary ExaminerWilliam L. Freeh Attorney, Agent, or Firm-Richard W. Hanes [5 7] ABSTRACT A simplified bottom hole pump having a tubular plunger forming a valve cage and having means for connecting the plunger to the pump rod string which also serves as end members for the valve cage, and communication is provided between the interior of the plunger and the annular space around the pump rod 1 string by means of inclined apertures in the sides of the end extension connecting means. A reciprocable valve is disposed within the valve cage and is provided -with radially spaced apart guide fins.
2 Claims, 10 Drawing Figures A waawllm PATENTED L SHEET]. 0F 2 I INVENTORS o at pn' 4' BY, N
ATTORNEY PATENTED JUL 91874 SHEET 2 0F 2 ill SINGLE OR MULTIPLE STAGE BO'I'IUM HOLE WELL PUMP Other and still further objects, features and advantages of the pump and pump system of the present invention will becomeapparent upon a reading of the following detailed description of the preferred form of the invention taken in conjunction with the accompanying drawings in which:
FIG. 1 is a diagramatic cross-sectional view of a well showing the tubing and pumps of the present'invention inserted therein.
FIG. 2 is a cross-sectional view of the sliding valve pump of the present invention. I
FIG. 3 is an enlarged fragmentary cross-sectional view of a well casing with the tubing and pumps of the present invention inserted therein.
FIG. 4 is an elevational view of the sliding valve pump of the presentinvention. I
FIG. 5 is an end view of the sliding valve pump.
I FIG. 6 is a cross-sectional view taken along lines 6--6 in FIG. 4.
FIG. 7 is an enlarged fragmentary cross-sectional viewof the sliding valve pump chamber showing the drop check valve in its raised position.
FIG. 8 is a cross-sectional view taken along lines 8--8 of the FIG. 4. v v
FIG. 9 is a cross-sectional view of the lower valve end portion of the sliding valve pump.
FIG. 10 is a cross-sectional view of the standing valve body showing the drop valve located therein.
Referring now to the drawings, a preferred form of the pumping system is diagramatically shown in FIG. 1
' as including a deep well 4 having acasing 5 and a casing head 7 at the surface of the ground Over the well 4 is a rod reciprocating apparatus 10 which acts to support' and vertically reciprocate a sucker rod 12 whose function it is to operate the plurality of insert pumps 15 which form the subject matter of the present invention. A flange or collar 17 suspends from the casinghead 7 a string of tubing or a working barrel 19 which is disposed in the well substantially coaxially with and inside of the well casing 5.
The system of the present invention includes a plurality of reciprocating pumping units or travelling valves 15, a typical one of which is shown in detail in FIGS. 2 and 4 through 8. Each of the travelling valves include upper and lower valve ends 20 and 21 respectively which are interconnected by a cylindrical valve plunger 23. The interconnection is made by means of the inter-.
nally threaded ends of the plunger 23 being threadingly engaged with the exteriorly threaded ends of the upper and lower valve ends 20 and 21. Between the said ends and interiorly of the valve plunger 23 is disposed a reciprocably movable check valve 25. The drop valve is preferrably of solid metal construction selected from a group of metals which are compatible with Teflon or similar plastic material which can be used to form a 2 wear resistant valve seat 27 in the valve end 21. The check valve includes a body portion having a blunt tapered nose 28 extending below the seating area in order to retard quick downward movement of the valve and prevent the valve from closing too rapidly. Serving as guides for the valve within the chamber defined by the interior of the plunger 23 are four equi -spaced radial fins 29 which are integral with the valve body 25 and which are dimensioned so as to slide easily within the chamber. The valve body 25 is also tapered on its top side so as to provide a maximum area path for fluid flow around the valve when it is in the open position as shown in FIGS. 2, 4 and 7. Fluid enters the travelling valve through a plurality of intake ports 31, inclined to the longitudinal axis of the valve, as shown in FIG. 9, in the bottom end valve member 21 and is discharged from the valve through a plurality of inclined exhaust ports 33 disposed in the upper end valve member 20. The exhaust and intake ports may also be slightly angulated with respect to the longitudinal-center line of the pump in order to provide an upward spiraling motion to the fluid passing through the ports, thus tending to keep solids in suspension in the fluid instead of permitting the sand and other solids to settle into the valve seat and valve shoulder surfaces to cause ,wear.
The concentric annular. collars 35 which are provided on both valve ends 20 and 21 are sized to provide a relatively small clearance with the interior of the working barrel 19 so that the traveling valve 15 acts as a fluid-packed piston as the sucker rod 12 is reciprocated.
In order to more fully describe the operation of the pump 15, fluid flow arrows with accompanying reference letters in balloons are provided in FIG. 2. The fluid tobe lifted is present at A'which has an area for fluid flow equal to the inside tubing area less the sucker rod area. Fluid flows to Band through the intake ports 31 to the intake throat C and hence between-the fins 29 of the check valve 25 at D and into the upper throat E. The fluids exit from the piston chamber through the exhaust ports 33 at F. The foregoing flow offluid takes place as the sucker rod l2moves downwardly in the well thus causing the check valve 25 to open. When the sucker rod 12 moves upwardly, a low pressure is created below the check valve 25 and the valve closes thus providing no path for reverse fluid flow and a consequent lifting of the fluids which have become trapped on the topside of the check valve 25.
One of the primary objectives of the invention is obtained through the design and formulation of the check valve 25. The tapered top portion of the valve in cooperation with the spaced apart fins provide a greater area for fluid passage than conventional ball valves operatingwithin the same sized tubing and consequently there is provided a greater volumetric efficiency and higher pumping capacity.
Preferrably, the travelling valves 15 which have been individually described are interconnected in a string at approximately 500 to 1,000 foot intervals in order that the valve or valves near the bottom of the well are not required to lift the entire column of fluid. Each valve lifts only the fluid which exists between that valve and the one above it. Thus, it is seen that the sucker rod requires less tensile strength at or nearthe bottom of the well than it does at or near the top which advantage effects a savings and economy in the sucker rod elements.
The outside diameter of the travelling valve is such as will provide a clearance with the inside diameter of the working barrel, thus providing a fluid packed piston when the rod is reciprocated.
The system of the present invention is completed by providing at the bottom end of the tubing a foot valve or standing valve 41. Basically, the standing valve is similar to the travelling valve except that the upper valve end 43 is exteriorly threaded in order to be attachable to the working barrel or tubing and fitting. Obviously, the standing valve, being attached to the tubing, does not reciprocate with the sucker rod but acts in the capacity of the well known foot valve.
1. A bottom hole pump for fluid wells actuated by a pump rod string comprising:
a plunger having a hollow tubular interior terminated at its discharge and intake ends respectively with an inwardly projecting annular shoulder surrounding a discharge port and an annular valve seat surrounding an intake port;
pump rod string connecting means extending longitudinally from the intake and discharge ends of said plunger, each of said connecting means having inclined apertures providing communication between said intake and discharge ports with the annular space surrounding the pump rod string;
a plurality of radially equi-spaced guide fins carrying a valve body and disposed for reciprocal and rotatable movement within said plunger and wherein said valve is adapted to sealingly engage said seat.
2. A bottom hole pump for fluid wells comprising:
a tubular plunger forming a valve cage;
valve seat means fonning caps for each end of said valve cage, each of said caps having reduced diameter extensions exteriorally of said valve cage and coaxially with the longitudinal axis of said cage and where each of said extensions is provided with obliquely inclined elongated bores which communicate through said valve seats with the interior of said cage;
a valve member adapted to sealingly engage one of said seat means and disposed within said valve cage for reciprocate movement therein; and
a plurality of radially spaced apart guide fins carried by said valve member, the upward extensions of which are adapted to engage the other of said seat means and said fins being in free movable contact with the inside surface of said cage.