US909593A - Bottom-hole packer. - Google Patents

Description

C. M. HEETER.

BOTTOM HOLE PAGKER.

APPLICATION FILED JAN. 25. 1907.

909,593, Patented Jan. 12, 1909.

' sand or rock formations than in others.

CHARLES M. HEETE'R, or BUTLER, PENNSYLVANIA.

:BO'i'IOM HOLE mom" it.

Spee'ifieatiofi of Letters Patent.

rates-tea in. 12, 1909.

Application filed January 25, 1907. Serial n6. 354,044.

To all whom it may concern:

Be it known that I, CHARLES M. HEETER, a resident of Butler, in the county of Butler and State of Pennsylvania, have invented certain new and useful Improvements in Bottom-Hole Packers, of which the following is a specification.

This invention relates to a packer adapted to be set at the bottom of a hole for packing the bottom of a fully drilled well, also for packing the bottom of a hole which is to be drilled deeper by operating through the packer.

The object of the invention is to provide a packer which when uncollapsed has the rubber annulus located above the shoe or lower end of the packer structure, but which when collapsed forces the rubber downward around the shoe almost if not entirely to the bottom of the hole, the lower extremity of the com-- pressed rubber o erating in conjunction with the extremity o the shoe for sustaining the packer and preventing it from settling unduly, atendency which is greater in song: further advantage in having the rubber extended clear to the bottom of the hole when the packer is set is that there is less liability of breaking the packer body in two at the upper end of the shoe than when there is a considerable portion of the body or shoe extended beneath the rubber when the packer is set.

A further feature of the invention is the formation of the lower extremity of the shoe which causes it to obtain a firm seat in formation in which otherwise the packer would tend to settle.

In the accompanying drawings, Figure 1 is a vertical sectional view of thepa'eker shown in position at the bottom of a hole before being set, and Fig. 2 is a similar view of the acker when set. Fig. 3 is a sectional view of the lower portion of the set packer, illustrating the same as having settled and formed a seat which prevents further downward movement.

Referring to the drawings, 2 designates the tubular packer body having secured to its lower end the tubular shoe 3, formed of thicker metal than body 2, the shoe adjacent its lower end having the annular bulge or enlargement 4. From this enlargement the outer face of the shoe is coned or beveled inward to its lower extremity, as indicated at 5. The upper extremity of the shoe is tapered at 6, so that the rubber annulus 7, surrounding body 2, may readily start downward over shoe 3 when the packer is collapsed.

The upper end of body 2 is enlarged annnlarly at 8,- and loosely fitting around the body beneath the shoulder formed by this enlargement is ring 9, having its under face beveled and bearin against the upper extremity of annulus Ring 9 is secured to the lower extremity of outer or telescoping tubular section 10, and carried by the upper end of the latter is collar 11 to which the tubing or other packer-lowering device is secured.

The telescoping parts of the packet are rigidly united by frangible rivets 12 which extend through tube 10 and enlargement 8 and hold the parts separated or uncolla'psed while the packer is being lowered into the well. As soon however as shoe 3 reaches the bottom of the hole and provides the necessary resistance, the weight of. the tubing or other lowering device operates to shear rivets l2, whereupon said weight is exerted on the rubber, forcing it downward over shoe 3, which in turn spreads the rubber laterally and forces it tightly against the well wall, as shown in Fig. 2. Thus the shoe of thicker metal performs the double function of supporting the packer and spreading the rubber. The compression of the rubber may be such as to carry it downward no further than enlargement 4, or it may be forced down completely around the latter as far as the lower extremity of shoe 3. The outer taper or bevel 5 of the lower extremity of the shoe wedges into formations which tend to give under the weight of the packer, crowding the sand or rock outward in such a way as to prevent any considerable settling, as will be seen by referring to Fig. 3. ThlS tendency is probably greater when the drilling is continued through and below the packer, also as illustrated in Fig. 3. The

packer body or shoe may settle to such an ency of the shoe collapsing under the weight of the tubing, or of the shoe being broken by the drilling tools operating therethrough, than in those constructions of bottom hole packers wherein the rubber when compressed or packed terminates a distance upward from the bottom of the hole.

I claim 1- 1. A bottom hole' packer comprising tele scoping inner and outer sections, a shoe secured to the lower end of the inner section and adapted to rest on the bottom of the hole and sustain the packer and a rubber annulus embracing the said irmer section and adapted to be forced downward around the shoe by the said outer section.

2. A bottom hole packer comprising telescoping inner and outer sections, a shoe secured to the lower end of the inner section and adapted to rest on the bottom of the hole and sustain the packer, the shoe bein larger externally than the inner section an at its upper end tapered upwardly, and a rubber annulus surrounding the said inner section and adapted to be forced downwardly by the said outer section over the tapered upper end of the shoe and downward around the latter,thereby expanding the annulus radially and contracting it longitudinally.

3, A bottom hole packer comprising telescopin inner and outer sections, a shoe secure to the lower end of the inner section and adapted to rest on the bottom of the hole, the shoe being larger externally than the said inner section and at its upper end tapered upwardly, the shoe having an external enlargement adjacent its lower end, and a rubber annulus embracing the said inner section and adapted to be forced by the said outer section downwardly over the being larger externally shoe and over and around the said shoe enlargement. I

4. A bottom hole packer comprising telescoping inner and outer sections a shoe secured to the said inner section and adapted to rest on-the bottom of the hole, the shoe than the inner section and having its lower extremity tapered for the purpose described, and a rubber annulus surrounding the said inner section and adapted to be forced by the said outer section downwardly over the shoe. v

5. A bottom hole packer comprising telescoping sections, a shoe thicker than the in- 5 ner section and forming a bottom continua-- tion thereof, the shoe having an annular enlargement adjacent its lower end with the outer surface of the shoe coned or beveled from said enlargement to the bottom ex- 6 tremity of the shoe, and a rubber annulus surrounding the inner section of the body and adapted to be forced downward over the shoe when the packer is collapsed.

6. A bottom hole packer comprlsin a tu- 6 bular body portion having an en argui shoulder-forming upper end, a shoe depending from the lower end of the body, a rubber annulus surrounding the body, a ri encircling the body between the upper en of the annulus and said body enlargement, a tubular part secured to and extending upward from the ring and adapted to telesco the body, and fran ible rivets uniting said tubular part with t e upper portion of the body.

In testimony whereof I afiix my signa-' ture in presence of two witnesses.

CHARLES M. HEETER.

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