US2000109A - Oil well swal - Google Patents

Description

May 7, 1935.

\ B* E, TYLER OIL WELL SWAB Filed F'b. 14, 1955 y ,34 irl/.56 @#57 S 39 INI/ENTOR.` \40 Beer E. NLE/z ATTORNEYS.

' In the drawing Patented May 7, 1935 v UNITED STATES PATENT OFFICE 2,000,109 i 011 WELL SWAE Bert E. Tyler, Los Angeles, Calif., Application February 14, 1933, Serial No. 656,669 Z Claims. (Cl. 309-23) This ,invention relates to an oil well tool', and.

particularly pertains to a well swab.

In oil eld production operations it sometimes occurs that the well does not ow freely, although its potential production is greater than the capacity of a regular oil well pumping unit. In such cases it is often'possible to obtain maximum production by a swabbing operation. The efficiency of a well swab is in direct proportion to the ability of the swab to form a tight t between its packing elements and the surrounding wall of the well casing, and to maintain this fit irrespective of wear upon the packing elements. It is the principal object of the present invention, therefore, to provide a well swab which may be easily lowered into a well casing, and which operates by mechanical and hydrostatic pressure means to maintain a suitable packed relation with the casing at all times.

The present invention contemplates theprovision of a well swab having a tubular central mandrel upon which is mounted a Aplurality of packing units, said under mechanical pressure to expand against the wall of a well casing, and being provided with means to cause varying degrees of hydrostatic pressure to be imposed upon the successive packing elements to expand them into the casing so as to obtain a maximum swabbing effect even though certain of the packing units should become damaged to an extent where they would be practically useless.

The invention is -described by way of example in the accompanying drawing, in which:

Figure 1 is a view in central vertical section and elevation showing the well swab in position within a section of well casing.

Fig. 2 is a view in transverse section through the well swab as taken transversely of the packing cap and structure as shown in Figure 1, and as indicating the manner in which hydrostatic pressure may be imposed upon the packing element.

Referring more particularly to the drawing, I0 indicates a well casing into which a well swab II is introduced. The depth at which the swab is operated is determined by the condition of the well and the level of the fluid within the casing. the swab II is shown as provided with a top packing rubber I2 and a lower packing rubber I3. The upper rubber is mounted upon an upper section I4 oi a tubular mandrel, and the lower rubber is mounted upon the lower section I5 of a tubular mandrel. Said mandrel sections abutting against `each other at I6 and being threaded into the opposite ends of a center packunits being normally set ing cup I1. at its upper member I9.

upper packing rubber an oppositely disposed cylindric the upper cylindrical extension 2l rubber I3. The packing rubbers as are formed at their oppos bore receiving a cylindrical extension 20 of the cup member a cylindrical cup has a center I2. The cup-member I9 has al bore receiving `o the packing thus described ite ends with longitudinally aligned cylindrical extensions 20 and 2|.

The intermediate portion of each of the packing rubbers is indicated at 22 as beingy of relatively large diameter and is preferably formed with its largest diameter intermedia surfaces of the packing members eter of the portion 22 this contact may be te its ends. The outer are convexed nt the largest diamis intended to contact with tubular shank 24 and with which section I4 is preferably forme central threaded c threaded en tubular pass with the upper opened end of I4 and is provided with a plura inclined eduction fluid may fl upper cup has a ceive the upper I4. .A central and outwardly through which upper end oi joint 28 which threaded onto the tion I5. The

rubber the clined face 32 which enlarged central portions 2 that by tightening will be seen 3l against the adjacent ends bers I2 and I3, longitudin bly engage the wall of t of the mandrel sections of the in the center cup I1 as by welding.

The lower mandrel section I5 pro d integr/al.

ow from well casing above the swab. The the shank 2 may be threaded into 29 of a polish rod 30, or other suitable suspending element. The lower packing at its lower .end with a lower c lower end of various cups I8,

In order that de, the upper exprovided with an r end of the the mandrel This pening to red of mandrel section ageway 25 registers the mandrel section lity of upwardly ports 26 and 21 the mandrel 4 is formed with a pm the box joint I3 is provided up 3l which is mandrel secy I9, 23 and 3I'are` inwardly in- 2. In this manner 1t the cups 23 and packing rubal pressure may be exbody of rubber occurring between the opposed cups, thus the rubber and distended to forcihe casing. Either or both I4 and I5 may be secured jects through the threaded opening in the end wall of the lower cup :Hand into a threaded opening by a cylindria check Valve strainer portion of the check valve seat is formed desired. ttenti n is directed to the fact that the upper interior of the casing IU and a chamber 43 which 1l occur within the cups between their end walls and the end faces of the packing rubbers I2 and within the fluid of the well. Prior to lowering the swab into the well thecups 23 and 3| have been properly tightened to expand the packing rubbers l2 and I3 to fit within .the well casing. As

through the ducts 43 of the cups Attention is directed to the fact that wnen the device is assembled, the joint between the adjacent ends of the mandrel sections I4 and occur at I6 within the center cup upper end of I4 into the passageway 25 then outwardly through the into the casing.

of the shank 24, and ducts 25 and 21 swab is drawn upwardly, this liquid will be lifted from the Well.

As has been previously explained, some occawell casing, though the packing rubbers should become inoperative.

While I have invention as now known to me, it will be under- Having thus described my invention, what I claim and desire to secure by Letters Patent is:-

Y. 1. A packing structure tudinally compress the expanding member and remotas a HsiuNs.

wardly to form a seal with the seat within the cups.

2. A packing structure adapted to be expanded into a cylindrical Vnember comprising a, central cylindrical member upon which a tubular deformablepackig' element ismmounted, said element having-an" enlarged central body portion adapted to contact with the surface of the member into which it is expanded, and reduced cyl- 10 inder ends, said ends having end faces formed with a circumferentially extending V-shaped groove,

cylindrical cups at the opposite end of said packer and receiving the ends thereof, said cups being secured to the cylindrical member passing through the packer, whereby a compression force between the cups will tend to expand the packing, `said. cups,be.ing icrmedi .witnfiggtsf l communicating y withthc groovesintheendofrthe packing Whereby the fluid being packedmwll-naid in producing compression the packing.

Images