US 3678811 A
A pumping well working barrel includes an outer polyvinyl chloride sleeve and an inner liner of stainless steel.
Claims available in
Description (OCR text may contain errors)
United States Patent 51 3,678,811
Penwell 1 July 25, 1972 1 OIL WELL PUMP WORKING BARREL  References Cited UNITED STATES PATENTS  Inventor: James T. Penwell, Rte. 1, Box 45, Chelsa,
Okla 74016 2,240,121 4/1941 Patterson ..92/169 X 2,613,958 10/1952 Richardson ..138/140 X 3,484,539 12/1969 Glander et a1. 138/141 X  Flledz May 28, 1970 3,134,305 5/1964 Jensen, Jr. ..92/169 2,606,574 8/1952 Lefehvre ..l38/l41 X 1,498,806 6/ 1 924 Oberman, Jr. ..92/169 21 Appl. No.: 41,367
Primary Examiner- Edward .I Earls Almrm'yHead 8!. Johnson  U.S.C1 ..92/l69, 138/109, 138/140 I57] ABSTRACT ..F04b 39/12  Field Search I 92/]69 l7| A pumpmg well worklng barrel Includes an outer polyvlnyl 138/109 140, 14] 143 I45 DIG. 7; 166/105 I07 chlonde sleeve and anmnerlmer ofstamlesssteel.
243', 285/423; 308/4 R 3 Claims, 2 Drawing Figures OIL WELL PUMP WORKING BARREL BACKGROUND OF THE INVENTION This invention relates to pumping equipment and more particularly to a pump working barrel.
Present pump working barrels, such as used in pumps for pumping oil from an underground basin, commonly comprise a relatively expensive corrosive-resistant metallic cylinder such as stainless steel or brass hollowed out to form a straight concentric tube. The inner wall defining the tubular opening of the barrel is honed and receives the pump plunger which reciprocates therewithin. The inner tubular wall of the barrel is the only part of the barrel in contact with the well fluid and must be corrosive-resistant and hardened to resist wear, and smooth to effect a seal with the pump plunger. However, the remainder of the barrel merely provides rigidity and a means to connect the barrel to the remainder of the pump casing. Thus the process of manufacturing the entire barrel from expensive corrosion-resistant material results in an excessively priced barrel.
It is therefore an object of this invention to present an improved working barrel having a relatively thin inner liner and an outer polymer resin sleeve.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the pump working barrel of this invention shown connected to pump casing.
FIG. 2 is a cross-sectional view of the working barrel of this invention taken along the lines 2-2 of FIG. 1.
I DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIGS. 1 and 2, there is shown the tubing of an oil well pumping unit disposed downwardly from the earth's surface into a well bore. Inserted between sections of engage the female threads of upper and lower coupling members 18A and 188 for interconnecting the pump working barrel to the pump tubing 10. Couplings 18A and 188 may be metallic in some instances, or in other instances may be made of a polyvinyl plastic resin.
The wall thickness of polyvinyl chloride outer tubular sleeve 20 can be varied and is determined by the design requirements of specific applications. Also, if an application requires such, female threads can be substituted for the male threads on the upper and lower endsof outer tubular sleeve 20.
Suitably secured against the inner walls of tubular sleeve 20 such as by a press fit and coaxial therewith is a hard, corrosiveresistant inner liner 22 of relatively narrow wall thickness such as .0065 inch. Inner liner 22 may be of a variety of corrosionresistant, endurable materials such as stainless steel, Monel, brass or chrome plated material as is required by the specifications of each particular application. Inner liner 22 includes on the upper and lower ends thereof outwardly beveled flanges 24 and the interior wall thereof is honed to effect a seal-tight of the normal suction cups of pump plunger 14.
In operation, the pump plunger 14 reciprocates within honed inner liner 22 to pump the fluid medium from the well basin in a manner well known in the art.
Although the invention has been described with a certain degree of particularity, it is to be understood that the words used are not words of limitation, but include all equivalents which operate in a similar manner to accomplish a similar purpose.
What is claimed is: 1. In a subterranean oil well tubing working barrel within which a reciprocating pump plunger operates, the improvement of said barrel comprising:
an outer tubular rigid synthetic plastic sleeve having means at is upper and lower ends thereon for threaded connection with said oil well tubing; an inner stainless steel liner disposed within and coaxial with said outer sleeve along its longitudinal length to form the inner periphery of said barrel, said inner liner adapted for reciprocally receiving said plunger of said pump. 2. A pump working barrel as in claim 1 wherein said outer plastic sleeve is polyvinyl chloride.
3. An apparatus as in claim 2 wherein the upper and lower inner ends of said sleeve and said inner liner are beveled outwardly.