US785906A - Casing packer and shoe for gas or oil wells. - Google Patents

Description

No. 785,906. PATBNTED MAR. 28, 1905.

A. P. MGBRIDE.

ASING PACKER AND SHOE FOR. GAS OROIL WELLS.

APPLICATION FILED DEU. 6,1904.

xff/m'////f/4.,////w/1 .A u 4x l l I l w z @L y /d/ W lr -L 7 a NMF@ & y A W` A l@ UNITED STATES Patented March 28, 1905.

PATENT OEEICE.

CASING PACKER AND SHOE FOR GAS OR OIL WELLS.

SPECIFICATION forming part of Letters Patent No. 785,906, dated March 28, 1905.

Application filed December 6, 1904. Serial No. 235,683.

To all whom, t nwty concern:

Be it known that I, ALBERT P. MOBRIDE, a citizen of the United States, residing at Independence, in the county of Montgomery and State of Kansas, have invented certain new and useful Improvements in Casing Packers and Shoes vfor Gas or Oil Vells, of which the following is a specification.

This invention provides novel means for packing deep wells, such as oil and gas, which will obviate crowding of the packing' material past the upper retainer and the consequent loss of its effectiveness after a comparatively short period of use.

For a full description of the invention and lthe merits thereof and also to acquire a knowledg'e of the details of construction of the means for effecting tbe result reference is to be had to the following description and accompanying drawings.

lVhile the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment thereof is shown in the accompanying drawings, in which- Figure l is a vertical central section of a casing packer and shoe embodying the invention, showing the normal arrangement of the parts. Fig. 2 is a view similar' to Fig'. l, showing the relation of the parts after the easing' is settled.

Corresponding' and like parts are referred to in the following description and indicated in both Views of the drawings by the same ref'- erence characters.

The numeral l indicates a tubular section which is adapted to be coupled to the lower end of the easing and form, in effect, a length collar or band 4 is tapered, as indicated at 5, and coperates with an expansible ring 6, loosely fitted upon the section l and having' its upper portion flared to conform to thetaper o. The ring 6 is split at 7 to provide for its expansion when forced upon the taper 5. The lower end of the ring' 6 is curved outward and downward, as shown at 8, to engage with the upper end of the packing 9 and confine the same. rlhe ring 6 constitutes a retainer for the upper end of the packing' 9 and is preferably made of' spring material, such as steel. A second ring, lO, is loosely mounted upon the lower portion of the tubular section l and is normally supported upon the shoulder 3 and is externally tapered, and its upper end l1 is curved in a similar manner to the end 8 of the ring' 6. The ring 10 constitutes a lower retainer for the packing' 9.

When the parts are assembled, the ring' l0 is supported by the shoulder 3, and the ring 6 is prevented from upward displacement by the collar or band 4. The packing' 9 is slipped upon the section l and is confined between the rings or retainers 6 and 10 and may be of rubber or other material commonly employed for packing deep wells. The tapered end 2 constitutes a shoe and descends as the well is bored or deepened. The retainer or ring l() catches upon the sides of the well and is held in place by a wedge action, and as the easing descends the packing 9 is compressed and pressing upward upon the ring or retainer 6 causes the same to ride upon the taper, with the result that the ring 6 is expanded, so as to snugly fit the sides of the well and prevent the upper portion of the packing 9 being forced above the lower end thereof. This is indicated most clearly in Fig. Q. The expansion of the ring 6 proportionately increases the resisting-surface against which the upper end of the packingl 9 bears and at the same time serves to coniine all of the packing' which is expanded in a diametrical direction proportionate to the longitudinal compression, thereby insuring the formation of a tight joint between the casing and the sides of the well and preventing' water or the like finding its way into the casing. The well or opening is of larger diameter than the packer, thereby permitting the latter to readily enter the well and descend to the bottom or place to be packed before operating. When the tapered ring l0 reaches the contracted p oint of' the TOO ing their inner or opposing ends outwardly flared, the upper ring having its inner side flared to conform to the tapered portion of the aforementioned band and made expansible, and packing loose upon the tubular section and confined between the rings thereof'.

In testimony whereof' I afHX my signature in presence ofl two witnesses.

ALBERT P. MCBRIDE. [L s] Witnesses:

E. S. ELLIS, EDGAR H. BRENNAN.

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