US3032112A

US3032112A - Oil saver shock absorber

Info

Publication number: US3032112A
Application number: US783330A
Authority: US
Inventors: Willie E Webster
Original assignee: Pure Oil Co
Current assignee: Pure Oil Co
Priority date: 1958-12-29
Filing date: 1958-12-29
Publication date: 1962-05-01
Anticipated expiration: 1979-05-01

Description

y 1962 w. E. WEBSTER 3,032,112

OIL SAVER snocx ABSORBER Filed Dec. 29, 1958 a4 l 3 I2 J [0 32 32 5 FIG I 2 2 e IN V EN TOR.

WILLIE E. WEBSTER BY FIG. 3 FIG. 4 ATTOR 3,032,112 01L SAVER SHUCK ABSQRBER Willie E. Webster, Olney, 111., assignor to The Pure Oil Company, Chicago, 121., a corporation of flhio Filed Dec. 29, 1958, Ser. No. 783,338 3 Claims. (til. 16684) This invention relates to equipment for wiping or stripping wire lines being withdrawn from oil wells in connection with the removal of swabs or similar tools and equipment from the well bore.

When tools are removed from a well bore, they are commonly raised until the uppermost portion of the tool strikes the lower extremity of the 1ine-stripping apparatus which is attached to the casing head. This metal-tornetal impact is injurious to both the tools and the line stripper. The prior art has recognized the desirability of placing a shock absorber or cushion at the lower extermity of the line-stripping apparatus to prevent metalto-metal impact.

The at also recognizes the desirability of using a linestripping apparatus which consists of two or more symmetrical sections which may be assembled in operative position on the casing head around the wire cable; or may be removed from the casing head and wire cable without first having to remove the cable from the line-stripping apparatus. This makes it possible to assemble tools in their operative position within the well bore before in stalling the line-stripping apparatus, and also makes possible removing the line stripper in order to dislodge tools which may become hung in the well bore.

It is an object of this invention to provide a shock absorber suitable for use with split-type line strippers.

Another object of this invention is to provide a line stripper shock absorber which may be removed from the casing head and wire cable without first removing the wire cable from the well bore.

It is still a further object of this invention to provide a shock absorber retainer which is permanently fixed to the line-stripping apparatus.

Briefly, this invention consists of the combination of a split-type line-stripping apparatus, a bumper pad made of synthetic rubber or other suitable elastomer, and a bumper retaining member which is permanently fixed to the lower extremity of the line-stripping apparatus and firmly holds the bumper pad in place.

This invention can best be described by reference to the drawings, of which FIGURE 1 is the side elevation and partial section view of a typical line-stripping apparatus and shock absorber.

FIGURE 2 is a bottom view of FIGURE 1 along line 2-2.

FIGURE 3 is an elevational view and FIGURE 4 is a plan view of a bumper pad forming part of the novel apparatus.

FIGURE 5 is an elevational view of alternate bumper pad construction.

Referring to FIGURE 1, the apparatus of this invention is devisable into two symmetrical parts along the line AA. Accordingly, the base plate member is divided into right and left hand portions and 12. The retaining sleeve 14 is also divided into corresponding right and

left hand sections

16 and 18. Retaining sleeve 14 has an inwardly depending flange 20 which serves to retain bumper pad 22 within the retainer sleeve and in contact with the

base plate sections

10 and 12. Referring to FIG- URES 3 and 4, bumper pad 22 is cylindrical with a central passage 24- through which the wire cable may be run down into the well. Bumper pad 22 may be made in two or more segments but is preferably formed in one piece, the radial slit 26 extending from passage 24 to the outside surface of the bumper pad permits the pad to be expanded so that it may be slipped on or off of the wire cable. The bumper pad may be constructed of any oilresistant resilient substance but is preferably made of a synthetic rubber which is resistant to oil. FIGURE 5 shows an alternate bumper pad construction including a groove 28 to accomodate the inwardly depending flange 20 of retainer sleeve 14. The portion 30 of the pad extends below and covers flange 20.

The retainer sleeves,

sections

16 and 18, may be formed integrally with the

base plate sections

10 and 12 or they may be welded in place on the base plate sections with bead weld 32. The right and left band members of the line-stripping apparatus are held together by nuts and bolts 34.

The removal of the line-stripper shock-absorber apparatus of this invention from around a wire cable With- :out removing the wire cable from the well may be illustrated as follows: First, the line stripper is unfastened from the casing head in the conventional manner, then nuts and bolts 34 are loosened and removed. The linestripper apparatus with the shock absorber retaining sleeve segments in place may then be separated into the right and left hand portions and removed from the wire cable. Bumper pad 22, which remains attached to the cable, may then be removed by expanding the bumper pad along the radial slit 26 and pulling it over the wire cable.

It will be noted that instead of using screws or other fasteners to fix the shock absorber in place, the sleeve is instead made an integral part of the base plate or in the alternative is welded to a base plate. This avoids the possibility of screws or other fasteners coming loose and dropping into the well bore where they may cause tools to jam in the well bore.

I claim:

1. In combination in a line-stripping apparatus, a splittype line stripper housing, the lower portion of which comprises a similarly split retainer sleeve having an inwardly depending flange at its lowest extremity, and a radially slit bumper pad having a vertical passage therethrough and a horizontal circumferential groove adapted to accommodate said inwardly depending flange, the portion of said bumper pad above said groove being within and supported by said sleeve and flange, the portion of said bumper pad below said groove lying below and substantially covering the lowest surface of said flange.

2. An apparatus according to claim 1 in which the bumper pad is composed of an elastomer.

3. An apparatus in accordance with claim 2 in which the bumper pad fits snugly against the inner wall of said sleeve.

References Cited in the file of this atent UNITED STATES PATENTS 696,747 Rigby Apr. 1, 1902 913,286 Heeter Feb. 23, 1909 1,627,945 Wigle May 10, 1927 1,646,639 Crowell Oct. 25, 1927 1,823,233 Bell Sept. 15', 1931 1,858,882 Cole May 17, 1932 2,005,259 Guiberson June 18, 1935 2,657,414 Miller et al. Nov. 3, 1953 2,842,386 Regan July 8, 1958