US1710203A - Packer - Google Patents

Description

April 9 w. H. BURSTALL 1,710,203

PAGKER Filed Feb. 2'7, 1928 INVENTOR.

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A TTORNE YS.

Patented Apr. 23, 1929.

UNITED STATES PATENT OFFICE.

PACKER. .x

Application filed February 27, 1928. Serial No. 257,495.

This invention contemplates a novel form of packing means adapted to seal off communicati on between certain zones of a packer.

The invention has forv an object the provi:

objects in view. the invention consists in the novel and useful provision, formation, construction, association and relative arrangement of parts, members and features all as shown in a certain embodiment in the accompanying drawing, described generally and more particularly pointed out in the claims.

In the drawing:

Fig. 1 is an elevation partly in section of the improved packer;

Fig. 2 is a fragmentary vertical section of certain portions of the invention and on an enlarged scale from the showing of Fig. 1;

Fig. 3 is a cross sectional detail showing the packer in operation, and

Fig. 4 is a plan view of a packing ring used in practising the invention.

Corresponding parts in all the figures are designated by the same reference characters.

Referring with particularity to the drawing. the improved packer as an entirety is designated by A, and the improvement contemplated by this invention and incorporated in the packer is designated by B.

The means B comprises a ring which is of any cross section and shown in the present instance as circular at 1 in Figure 2, prior to deformation thereof. This ring may be formed of any suitable substance such as lead or treated fabric or asbestos which has been treated with graphite or any similar substance or substances which act as an effective seal for fluid. The said packer briefly stated includes-an annulus a which is provided with an annular enlargement 2, and with a wall thereof inclined or cammed at 3. The said enlarged portion is shouldered and screw threaded at 4 to receive an annulus 5 and which annulus is enlarged and shouldered at 6. A slip expander sleeve 6 is carried upon the annulus 5 and a lower portion thereof is normally seated upon the shoulder 6 as shown at 7. This expander sleeve is provided with an annular concave groove 8 at one end thereof and the peripheral surface of said expander sleeve is tapered at 9. The annulus 5 really forms an extension of the annulus a, the annulus a being secured to a member 10. The part 5 carries upon,the periphery at a lower portion thereof a pin or pins 11 and surrounding the member 5 and below the shoulder portion 6 is a collar 12 provided with a bayonet slot. Secured to this collar 12 are slips 0. In particular the slips include serrated heads 14, secured to arms 15. Also carried by the collar 12 are bowed spring arms 16.

It will be noted particularly that the collar 12 is reduced in diameter at the zone of attachment thereto of the spring arms and the slips. The slip heads have. their back faces inclined where they are in contact with the beveled or inclined face 9 of the expander sleeve 6. Assuming that the packing ring is carried or resting between the top surface of the sleeve 6 and the cam or inclined face 3 of the annulus a,'when the parts are in the position shown in Figure 1 the packer may be lowered within the casing or tubing C, by securing tubing D to said packer, to a desired zone within the casing, and upon turning the tubing D the packer will be turned so that the pin or pins 11 are released from the bayonet slot 13. The springs 16 by their frictional engagement with the inner surface of the casing will readily permit such disengagement upon raising the tubing D to raise the annulus a and release the pin or pins from the bayonet slot or slots. lVhen this occurs the slip heads will be forced in an outwardly direction by the slip expander sleeve, so that the serrated surfaces of said slip heads will engage the inner surface of the casing. Upon further lowering of the tubing D with its associated annulus a, the slip expander sleeve will move upwardly to a slight amount and the annulus a will move downwardly so that 'the inclined wall 3 which forms an expander portion will engage the packing B and deform or compress the same as shown in Fig. 3 at 17. Thus said packing will stop communication between the casing and the packer at this zone. In Fig. 2 the tubing shown at d is a part of the packer while the tubing shown at e is known as the oil tube.

Attention is directed to the fact that the expander sleeve 6 is provided with one or inclined face 9 to a cut away portion 19 of the sleeve. These bores provide circulation openings.

In this regard attention is directed to Fig. 3, the dotted line 20 of which represents an elevated position that the annulus a may assume and so assuming be raised above the packing B. In this regard it will be noted that the packing still remains within the concave groove 8 and in engagement with the inner surface of the tubing. However, these circulation openings or bores permit a direct circulation through the bore and around the said packing. This is a feature of great importance in the present'invention as it provides a means whereby a sealing off of desired zones between the packer and cas-- ing may be effected, as well as a means whereby circulation may be effected around said packing.

The device is particularly useful in oil well practice where it is desired to shut off gas flow, to force the gas into the oil to be lifted, to aid in the lifting of the oil to the surface of the well. The packer may be set at any desired location in the well hole.

It is obvious that various changes, modifications, and variations may be made in prac-.

Havingthus disclosed my invention, 1

claim and desire to secure by Letters Patent:

1. In a packer, an expander, a movable expander sleeve, and an annular packer between said expander andexpander sleeve, said expander sleeve being formed'with a circulation opening; said expander and expander sleeve being ada ted to cooperate to deform the annular pac (er, and said circulation opening permitting circulation of fluid therethrough and around said packer when the expander is moved from engage-' ment with said annular packer.

- 2. In a packer, an expander sleeve, an annular packer carried by said expander'sleev, said expander sleeve being formed with a circulation bore permitting communication at separate zones of. said annular packer.

In testimony whereof I have signed my name to this specification.

WILLIAM H. BURSTALL."

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