US2130267A

US2130267A - Paraffin scraper

Info

Publication number: US2130267A
Application number: US170111A
Authority: US
Inventors: Milam A Cowen
Original assignee: EDWARD RASNEK
Current assignee: EDWARD RASNEK
Priority date: 1937-10-20
Filing date: 1937-10-20
Publication date: 1938-09-13
Anticipated expiration: 1955-09-13

Description

Filed 001;. 20, 1937 a M m PW v a u. H w m 5 g.

l l HM l l HMWW 4 III F M a Patented Sept. 13, 1938 UNITED STATES PATENT OFFICE] Mllam A. Cowen, Gladewater, Tex assignor of one-fourth to Edward Rasnek, Kllgore, Tex.

Application October 20, 1937, Serial No. 110,111 2 Claims. (011. 166-48) The invention relates to an oil well tool, and

manner eliminating any. scraping action upon the inner surface of the casing or tube during downward stroke and on the reverse stroke or upward movement of the stem the blades will automatically move to a position for complete scraping action on the inner surface of the easing or tube for the removal of paraflin or other accumulated substance therefrom which createsobstruction to the free flow of oil from the 20 well in the pumping thereof.

Another object of the invention is the provision of a device of this character, wherein the mounting and working of the blades arenovel, being self-adjustablefor positive scraping optr'oduced into a, well casing or tube.

A further object of the invention is the provision of a device of this character, wherein the blades are assisted downwardly in a well cas- 0' ing or tube through the medium of a weight located beneath the said blades in their fitting with carrier or stem therefor and in this downward movement the said blades are inactive for scraping operation.

provision of a device of this character, which is simple in construction, thoroughly reliable and efiicient in operation, strong, durable, automatically adjustable from scraping to non-scraping positions during operation thereof, and inexpensive to manufacture.

With these .and other objects in view the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawing, which discloses the preferred embodiment of the invention, and pointed out in the claims'hereunto appended.

In the accompanying drawing: I

Figure 1 is an elevation of the device constructed in accordance with the invention and shown in scraping position within an oil well casing, the latter being in vertical section.

Figure 2 is a side elevation of the device reeration in the working of the device when in- A still further object of the invention is the moved from the casing, being partly. in section.

Figure 3 is a sectional view taken on the line 3-3 'of Figure 4 looking in the direction of the arrows.

Figure 4 is a sectional view on an enlarged scale'taken on the line 4-4 of Figure 2.

Figure 5 is a sectional view on the line 55 of Figure 2.

Similar reference characters indicate corresponding parts throughout the several views in the drawing.

Referring to the drawingin detail A designates generally a portion of an oil well casing or tube and B the scraping device, respectively, which latter constitutes the present invention and will be hereinafter fully described. v

The device B comprises a stem or shank It). having a major lower portion ll downwardly tapered and a minor ,upper portion l2 reversely tapered, while between these portions is a cupshaped holder forming a'carrier l3, being exteriorly formed on the stem or shank ill. This carrier l3 between its side wall It which is upwardly flared and the outer surface adjacent thereto of the stem or shank It forms an annular downwardly directed wedge-shape seat l5 for a plurality of sector or segment shaped scraper blades it, these being downwardly tapered in a longitudinal direction or reversely to the minor portion i2 of the stem or shank it. The blades H5 at their narrower ends are adapted for seating and wedge engagement in the seat i5 which is the scraping position for said blades on the upward stroke or movement of the stem or shank .lll.

Concentrically about the minor portion I2 and extending from within the carrier l3 to a spacing spider or ring H and following the taper of said portion i2 is a series of uniformly spaced guide rods !8 which are passed through suitable clearances or passages therefor provided in said blades 56 and-in this manner the latter are guided toward and away from the said carrier pllng with a tool line or a sucker rod (not shown) The rods 88 are removably engaged with the spider or ring it. when the same is detached from the end 19 ofthe stem or shank l0, and in this manner the blades i6 can be pulled oil of the The lower end 2| of the stem or shank. Ill is said rods i8, the latter being welded or otherwise secured to the carrier l3 interiorly thereof.

' II of the stem or shank effects weight below the 'blades Hi to assist in the lowering of the device exteriorly threaded for fastening to a coupling box (not shown) of the line or sucker rodand this box together with the lower major portion cross-sectional sizes or diameters of tubes or casings. When the said blades are in scraping position they will have close contact with the,

inner surface of the casing or tube A and such blades at their larger ends are of greater circular diameter than the open end of the carrier it. When the blades l6 move away from the carrierl3 on the down stroke of the stem or shank 56- they will not scrape the inner surface of the casing or tube A, the device being lowered into the latter and during this movement the blades are in nonscraping position, while on the upstroke of the device the said blades [6 move to scraping position.

The upstroke of the device removes paraffin or the like 24 from the inner surface of the casing or tube A for the free flow of oil from the well during the pumping operation.

What is claimed is:

l. A device of the character described, comprising a stem having an upwardly tapered minor portion, a cup-shaped carrier located at the tapered minor portion, and shiftable sector shaped blades about the said minor portion and reversely tapered thereto for seating and unseating in and from the carrier. g

2. A device of the character described, comprising a stem having a tapered portion, a plurality of sector shaped scraper blades around said tapered portion, a cup shaped receiver for the blades, and means for guiding the blades into and from the receiver.

MILAM A. COWEN'.