US1970061A - Swage for oil wells - Google Patents

Description

Aug. 14, 1934- M. STANFIELD ET AL SWAGE FOR OIL WELLS Filed Jan. 24, 1953 Patented Aug. 14, 1934 UNITED STATES PATENT GFFICE SWAGE FOR OIL WELLS Lawrence M. Stanfield Angeles, Calif.; said Kenneth Smith, Los

4 Claims.

The object of this invention is to provide a simple, inexpensive and efiicient tool whereby dents or other deformations which may be formed in well casings or tubings may be easily and efiectually removed so that the tube or casing will be restored to its cylindrical form and will permit the free operation of a drilling or other tool. The invention is illustrated in the accompanying drawing and will be hereinafter fully described and defined.

In the drawing,

Figure 1 is a side elevation of a tool embodying the present invention,

Fig. 2 is a vertical section showing the tool in operative position, and

Fig. 3 is a horizontal section on the line 3-3 of Fig. 2.

The reference numeral 1 indicates a portion of a, tube or casing which has been deformed, as indicated at 2, by pressure exerted externally thereon from surrounding material or from other causes. The tool of the present invention is designed to remove the deformation and restore the tubing to its original, true cylindrical form.

In carrying out the invention, there is provided a body 3, the lower extremity of which may be slightly tapered, as shown, and which is provided in its lower end with an internally threaded socket 4 for the attachment of a pilot or other element. A stem 5 rises centrally from the body 3, and the upper extremity of this stem is externally threaded and preferably tapered, as shown at 6, whereby a sub 7 may be attached, the sub being provided with a threaded shank 8 for the attachment of a rotating rod or tube, in-

dicated at 9. A bore 10 extends centrally through the body 3, the stem 5 and the sub 7, as shown clearly in Fig. 2, for the passage of mud-laden fluid. In the top of the body 3, there are provided a plurality of sockets which receive the lower ends of pins 11, any number of which may be provided. These pins each supports a swaging roller 12 which tapers from its center toward both ends and at its extremities has portions 13 which are truly cylindrical, the formation of the rollers making them symmetrical, so that in assembling the parts either end of the roller may be placed uppermost and it is not necessary to lose time bringing a particular end of a roller into a certain position. Fitted upon the stem 5 are a series of washers 14 which decrease in diameter from the uppermost washer to the central washer and then increase in diameter to the lowest washer, so that the edges of the several washers conform to the outline of the swagand Harry Webb, Los

Webb assign or to Lynn Angeles, Calif.

1933, Serial No. 653,318

ing rollers 12, as will be understood upon reference to Fig. 2, and it will be noted that the washers extend close to the swaging rollers so that, while they do not actually make contact with the rollers to resist the free rotation thereof, they will receive the lateral thrust imposed upon the rollers when at work so that the rollers will be sustained and bending of the several pins or axles 11 will be efiectually resisted. The upper ends of the pins 11 are received in openings provided therefor in a plate 15 which fits about the stem 5 and has a notch in its central opening to engage a key or lug 16 on the stem whereby the plate will be locked to the stem and will be forced to rotate therewith. The plate or disk 15 is provided with an annular rib or flange 17 at its lower side and rests upon the uppermost washer 14. Engaged around the disk or plate 15 is a flange 18, the inner diameter of which is greater at the lower side of the flange than at the upper side thereof whereby an internal shoulder is refined to rest upon the annular lip or rib 17 upon the disk, as will be understood upon reference to Fig. 2. When the parts are assembled, the upper edge of the flange 18 will project slightly above the upper side of the plate 15, and a cap plate or cover 19 rests upon the upper edge of the flange and fits around the stem 5, the lower end of the sub 7 bearing upon the cap or cover plate 19 so that when the sub is turned home on the stem the cap plate will be clamped firmly against the flange and the flange will be held firmly upon the disk or plate 15. By this arrangement the entrance of mud or other foreign matter to the upper ends of the rollers and the pins upon which they are mounted is prevented and clogging of the action is avoided.

When the tool is to be used, it is lowered in the tubing or casing and is rotated in the usual well-known manner. When the tool reaches the deformed or dented spot of the tubing, the lower tapered portions of the rollers will bear against the same and, as the tool is rotated and pressure exerted thereon, the deformation of the tube will be ironed out and the tube restored to its original truly cylindrical condition. The tapered formation of the rollers minimizes the frictional engagement between the same and the tubing so that only so much of the surface of the tubing as is not plumb will be encountered by the rollers and the work will progress rapidly and easily. Should the rollers be worn to such an extent that they fail to perform their allotted functions properly, they may be reversed. Should any one washer become broken, it may be removed and a duplicate thereof substituted without requiring the replacement of all the washers, so that the cost of maintenance will be much less than would be the case if the well-known solid, continuous plug were employed. The arrangement of the bearing plate or disk 15, the cap plate 19 and the flange 1''! is such that the rotation of the pins or rollers is not afiected, but the entrance of foreign matter is effectually prevented and, ob-

viously, the parts may be very easily and quickly assembled.

Having thus described the invention, we clairni 1. A swage for deep wells comprising a body having a central stem rising therefrom and provided with a longitudinal bore opening through the top of the stem, means connected with the upper end of the stem for rotating thebody, a bearing plate keyed to the upper end portion of the stem, pins fitted in said plate and in the top of the body, reversible swaging rollers car-' body, a bearing plate keyed to the upper end portion of the stem, pins fitted in said plate and in the top of the body, reversible swaging rollers carried by the several pins, and superposed bearing washers fitted about the stem, the swaging rollers being tapered from their centers toward both ends and the, outer edges of the washers conforming to the shape of the rollers and adapted to receive the thrust of said rollers.

'3;"'Aswaging tool for wells comprising a body having a central stem rising therefrom, means connected with the upper end of the stem for rotating the body, a bearing plate keyed tothe upper portion of the stem, a flange mounted on the edge oi thebearing plate and depending below th'same, a cap plate resting on the flange and fitting around the stem, pins fitted in the body and in the bearing plate, g and swaging rollers mounted upon the several pins.

4. A swaging tool comprising a body, a bearing plate spaced vertically from the body and having a peripheralrib, a flange surrounding the plate and provided with an annular shoulder bearing against the rib, a plurality of pins held by and between the plate and body, swaging rollers carried by the pins, and means between the rollers for receiving thrust and sustaining the rollers.

LAWRENCE M. STANFIELD.

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