US1743937A - Swab - Google Patents

Description

. ferent kinds ofI packing.

Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE 1,1* HARVEY R. STANDLEE, OF TULSA, OKLAHOMA, ASSIGNOR OF ONE-FOURTH T0 :PAUL

` ARBON COMPANY, 0F TULSA, OKLAHOMA SWAB ' v.Applicationfiled May 15,

snugly lit against the interior wall of the casing regardless of thepressure. `Another disadvantage of some presento day swabs is the fact that the rubber packing thereon not `only wears out quickly but is difficult to replace. i

It is the purpose of my invention to create a swab which will `operate extremely satisfactory under a wide range of pressures and whichwill reduce wear upon its packing to a minimum. i

" I accomplish the above by .usingl two dif- My upper packingconsists of canvas or rubber orthe like and it is very stiff and the packing below this is rather liexible. The upper packing fits snugly against thercasing and carries most of the pressure due to the column of fluid `which. `is abovel the swab. The fluid which leaks past the stiff upper packing is carried by the flexible` packings there eneath.` The lowest packing is not quite as flexible as the centrally situated packing.

Thus', the stiff upper packing rides against the casing and takes or carries some of the pressure ofthe fluid above the swab which would otherwise press inwardly upon the flexible packing justbelow. Hence, the dif- `4.0 ference in pressure between the `inside and the outside Hof the flexible packing is iiicreased with the result thatl very little fluid will leakpast this flexible packing.

y The pressure is likewise held. ott of the 5 outside of the lower flexible packing by both tion"the` expansible part oriparts should' 1929. Serial No. 363,266.

the flexible packing thereabove and the stif packing. Thus the difference in pressure between the inside and outside of this last mentioned packing is even greater than that of the previously referred to packing and hence this lower packing cup is made slightly thicker and stiffer.

4 Another advantage which I obtain is the4 readiness with which the worn out rubber packing or the like may be renewed dueto the inner taper of the collars. i

Brieiiy described my invention consists of an integral hollow tube having a series of increasing diameters whereby all of the several packing and locking units may be successively placed on or removed from its lower end. Obviously, my integral structure has a maximum of strength with the minimum of `material asv there, are no `joints whatsoever. r Furthermore, it will be appreciated as the description proceeds that the point of greatest strain is at the top of the v packing unit and it is at thisu point that the hollowbody member is the thickest.

After the several packing units and their locking means are placed in position upon the hollow body member my novel valve is threadedly engaged at the bottom end thereof. This is a one-.way valve and its structure'is disclosed in my Patent 1,719,028, liled4 Aug. 26, 1926, entitled `Swab release mechanism. r

The upper end of the circular hole in the body member terminates in a slot` which passes through the wrench square and thus I utilize this `flat surface for two purposes. That is to say, by drilling this slot through the flat sides ofthe wrench 'square not only is the drilling operation shortened but the path traveled by the fluid through the swab is shortened and rendered less toituous.

The body of the swab can be made shorter and no space other than the wrench square is required for the openings which permit the fluid to pass from the interior to the exterior of the swab.

Other objects and advantages reside in the special construction, combination and arrangement of the various elements forming the invention as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part thereof, wherein;

The figure is a side View of my swab, parts being broken away in order to facilitate the showing.

Similar numerals represent similar parts throu hout the several views.

VRe erring now to the drawing, numeral 10- indicates the main body Vor mandrel of my swab. The main body or mandrel is preferably forged from high grade steel and it has the usual tapered and threaded portion -11 at its upper end, by which it is attached to the usual string of tools as is well known to those skilled in this art.

A short distance below the threaded part -11- are formed flat surfaces l2- and 13 thereby furnishing an ordinary wrench square and a slot or opening #111- passes directly through the body from one flat surface to the other.

The slot I4- connects with the hole -15- which runs longitudinally of the main body member. The hole 15eand the slot -14- provide a passageway for the fluid upwardly as the swab is gravitated downwardl into the well.

A shoul er 1G- is formed just below the slot or opening -14- and a cylindrical seat -'-17-,with a threaded portion -18-, is formed just below the shoulder. Thus, the impregnated canvas and rubber packing -20-, with the disc plate -21- as a follower, is held tightly against the shouldered ortion -16- by means of an ordinary ook nut -22-.

Just below the lock nut 22- the diameter of the body portion is reduced to form the surface -23- with a threaded portion 24 and an inverted cup-shaped member 2oformed of a bottom part -26-, with a hole therein, and a tapered flange Q7-1 is placed against the shoulder -28-. Another similar oup member -25- is uprightly placed below the inverted cup mem` ber and thus a seat is formed for my flexible rubber aeking.

As s own, my packing consists of a bulged cylindrical shaped flexible body -30.-., preferably of rubber, and tapered end portions -3land -82- which snugly fit into the cups -25. Lock nuts 33- and *36P- are threadedly engaged upon the threaded portion 24- and provide means for placing the rubber packing 30- under compression as well as retaining it in place. Additional pressure is obtained on the inside of the packing -30--,

when under actual working conditions, by boring holes -35- through the body just behind the bulged portion of the flexible packing. These holes allow the fluid to freely enter behind the packing and push it outwardly but the stiff upper packinv hinders the fluid pressure from imme iately reaching the outer side of this flexible packing and hence a difference in pressure is obtained. This outwardly directed pressure maintains a desirable tight lit between the flexible packing and the casing.

A shoulder -40- is formed just below the threaded portion Q4- and cups -41- hold the rubber -42- in place and are in turn held in lace by the lock nuts 43- and 44- t readedly engaged upon the threaded portion 45-. A hole 46- allows the fluid to pass behind the rubber -4Q- and add to its outward pressure when in operation.

As previously set forth the stiff' packing prevents the fluid pressure from reaching the outside of the upper flexible packing and allows it only on the inside thereby causing it to expand. Similarly, or rather in increasing fashion, the stiff packing and the upper flexible packing bot-h tend to prevent fluid pressure from reaching the outside of this lower cup and hence its inner pressure causes it to press snugly against the walls of the casing in which 1t is being operated.

The threads -45- also provide means for holding the neck 51- of the valve -50- rigid in place at the bottom of the mandrel or body part. This is a one-way valve and it allows the fluid to pass upwardly as the swab is being lowered into the well.

Although a particular embodiment of the invention has been illustrated and described in order to comply with the terms of the patent statutes, it is not intended that the invention shall be limited to said particular embodiment since the invention may be applied to other forms without departing from its spirit.

I claim:

l. A swab consisting of a substantially cylindrical integral body of successively increasing diameters relative to one end thereof and a squared portion thereon near the other end; threaded portions on the several stepped portions adjacent the shoulders therebetween, extremely stiff acking on the portion closest to the s uare portion; means for holding or loc ing it in place; other packing on the adjacent portion and means to hold it in place.

2. A swab comprised of a body member having a hole therethrough, heavy stiff packing encircling the swab near its top, flexible packing encircling the swab below its top, said body member having an opening leading from its interior hole to a CID CERTIFICATE 0F CORRECTIQN.

Patent No. 1,743,937. Granted January 14, 1930, to

HARVEY R. STANDLEE.

It is hereby certified that error appears in the printed specification `of the above numbered patent requiring correction as follows: Page 3, in claim 3, first line, for "claim 1" read "claim 2"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the t case in the Patent Office.

Signed and sealed this 25th day of March, A. D. l1930.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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