US1629018A - Strainer - Google Patents

Description

' CLARENCE J. oonnanv,

fluid is separated Patented May 17, 1927.

UNITED 'STATES PATENT OFFICE.

LOS ANGELES, CALIFORNIA,

or Los ANGELES, CALIFORNIA, assronon 'ro KOBE, me, or

a. conrona'rron or camroama.

sraamnn.

Application filed January 5, 1925. Serial No. 736.

are used, and it 18 particularly adaptable where the walls of the slots are subjected to in abrasive wear. 'My invention is of prointo the well inside the casing,

pump the oil at thebottom of the well is nounced value in the oil industry as a screen casing or strainer. After a well has been drilled to the oil producing stratum, a. casin is lowered into the well. A pump is by which elevated to the surface. A screen casing is situated at the lower end of the well casing. This screen casing, as now constructed, pro- 20 vides a multiplicity of narrow elongated slots through which the oil flows to enter the casing. These slots are of such'a size and shape as to exclude any particles of sand or gravel which might cause injury to .-5 pumping equipment. The abrasive efiect of ;="strained will"enter this face. the slot'is comparatively narrow,

the minute particles on the wall of the slots tends to wear the walls away, and to enlarge the slots, and in time the larger particles will pass through these slots.

It is an object of this invention to provide a strainer having slots, the walls of which slots being capable of enduring considerable attritional action. I accomplish this object by providing areas around the slots which are extremely tough and will resist a maximum of abrasive wear.

it is another object of the invention to provide a strainereinploying inserts which have slots therein. This permits the making of a strainer of a body of comparatively soft material and an insert of a comparatively hard or tough material. This is a very practical way to'provid'e ,siots with high. wear resisting walls owing to the fact that the inserts are of such a size that they may be very conveniently tempered or treated. in anymanner to acquire the desired hardness or toughness. keystone or wedge-shaped slot is most efiicient in preventing particles of abrasive material from passing through the strainer. Tlie'slots are arra-nged so that the narrow r es is posifihed so that the fluid bein This portiono? and only lowered the in practice it is found-that a the extremely minute particles may pass through this constricted openin By providing the slots in wedge-shape the entering face of the slot is relieved and the dan-v gcr of the slot clogging is reduced to a minimum. It is rather diflicult to provide a wedge-slot of this character when the slots are provided in the body member of the strainer. In producing screen casing, it is necessary to cut the slots from the inside of pipe by use of a machine, which is extended into the pipe. This is rather difiicult and expensive. By providing an insert as in my invention, it is very convenient to produce slots of this character. The inserts are'small in size and may be conveniently produced in a machine at a very small cost.

It is another object of the invention to provides. novel means for holding these inserts in place. In the body of the strainer, 1 provide openings which have converging walls. In case of a screen casing, these show my invention in the form of a screen casing for wells solely for illustrative purposes Fig. lis a fragmentary view of a strainer of my invention. 1

Fig. 2 is a cross section taken as indicated by the line 2-2 of Fig. i.

Fig. 3 is an enlarged fragmentary cross section taken through one of the inserts of my invention. I g

' Fig.4 is a .plan View of one of the open- -walls converge at the innerface of the wall ings provided in the body of the strainer to receive an insert of my invention.

Fig. 5 1s a perspective view of an insert "member arrangedfor insertion in the-openings shown in Fig. 4.;

In the drawing, I provide the body of a strainer in' the. form of a tubular casing member 11 which carries inserts 12 The body 11 is provided .with a multiplicity of openings like the one shown in Fig. 4;. Each openingl' i is of an elongated shape and has the ends thereof, as shown.

I Fig. 5. Each insert 12 is elongated in shape,

- serts .12 are curved, and the walls 20 and 21 as shown, and has converging walls 20 and 21 which are of a convergence equal to that of the walls 15 and 16. The ends of the inmeet thereat and form a shape complementary of the walls 15 and 16 of the openings 14. An elongated'slot 23 is provided in each of the inserts '12. This slot 23 is wedgeshaped or keystone-shaped, as shown clearly in Fig. 3 of the drawings. The walls 25 and 26 of the keystone-shaped slot 23 diverge from the outer face 27 of the insert 12. \Vhen the insert 12 is in place, as shown in Fig. ,3, the walls 20 and 21 thereof contactwith the walls 15 and 16 of the openings 14-. The insert is secured in place in the opening 14 as by welding 28, as clearly shown in The oil or liquid to be strained passes through the wedge-slots 23 from the outer faces 27 thereof. These slots are narrower they/ are small in size and may beconven :extensrve period of time.

at this face, and rovide the necessary relief, as referre to hereinabove. The body ll-may be made of a comparatively soft material such as softtsteel, which is comparatively cheap in price and is easy to work upon. The openings 14 in the member 11 may be provided in any suitable manner. I find it advantageous to provide the openings 14 by use of cutting torches, this method of forming the openings being presented to the Patent Ofiice in a separate applica'tion. The inserts 12 are to be made of a very tough or hard material which will resist maximum abrasive wear. A material such as manganese steel is very good for this use. The inserts may-be provided in any desirable manner and may be very cheaply produced by machine, owing to the fact that iently handled. By making the insert of a very tough material of this character, the

Walls of the slot 23 therein will have high wear resisting characteristics, and the size of the slot Wlll remain the same for a very As previously mentioned. is essential that the slots be of a definite size so as to prevent passage of any particles which might cause injury to a machine, or ;in the oil'industry'tothe punipf'fof the well. .The .man-

'ner of.retaining th iflserts in the body 11 is very simple gandthe inserts may be quickly and economically ins'talled.

I claim as my ,invention:

7 30th day of December, 1924.

1. A well strainer comprising: a pipe having an elongated opening formed therein, said opening having converging walls; and an elongated insert having correspondingly converging walls and secured in said opening, said insert having a single elongated aperture disposed lengthwise thereof.

2. A well strainer comprising: a pipe having an elongated opening formed therein,

said opening havinsmooth converging marginal walls; an elongated insert having correspondingly smooth converging perimetric walls adapted to closely engage said marginal walls when the insert is positioned in said opening, said insert having formed therein a single elongated aperture disposed lengthwise thereof; and means for securing said insert in said opening.

3. A well strainer comprising: a pIpe having an elongated opening formed therein,

said opening having smooth converging pipe wall.

4. In combination: .a plate of metal having an elongated opening formed therein, said opening having smooth converging marginal walls; an elongated insert ha-vin/g,

correspondingly contoured smooth converging perimetric walls adapted to closely engage said marginal walls when the insert is positioned in said opening, said insert being of the same thickness as said plate and having formed thereing a single elongated aperture disposed along its major axis; and

means for securing said insert in said opening flush with the surfaces of said plate.

5. As a new article of manufacture: an elongated strainer insert having pernnetric walls converging in the direction of its thick ness and provided with a single elongated aperture disposed lengthwise thereof.

16. As a new article-of manufacture: an elongated strainer insert having perimetric walls converging in the direction of its thinkness and provided with a' single elongated aperture disposed lengthwise thereof;- said aperture having-marginal walls diverging 7 relative to and in ,the direction of convergence of said perlmetric wallsset my hand at Los Angeles, California,- this CLARENCE J. COBERLY.

In testimony whereof, I have hereunto

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