US2172948A

US2172948A - Rat hole packer

Info

Publication number: US2172948A
Application number: US139937A
Authority: US
Inventors: John E Weiler
Original assignee: Halliburton Oil Well Cementing Co
Current assignee: Halliburton Oil Well Cementing Co
Priority date: 1937-04-30
Filing date: 1937-04-30
Publication date: 1939-09-12
Anticipated expiration: 1956-09-12

Description

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Patented Sept. 12, 1939 2,112,948 BAT nom Pacman.

JolmE. Weiler, Duncan, Okla., assignor to Halliburton Oil Well Cementing` Company, Duncan,

. Okla.

Application April 30, 1937, SerialNo. 139,937

` s claims. (c1. ice- 11) This invention relates to oil wellv equipment and more particularly to meansand methods for setting ,packers in a rat-hole in-,a well.

It isnften desirable to eiIect a seal between a 6 conduit placed in an oil well and the wall of the well. For example, where it is desired to obtain a sample of the connate uid in the well by means of a testing tool, a packer is placed on the bottom of the tool to effect a seal. An ex- 10 ample of this is disclosed in the patent to Simmons, No. 1,930,987. In making a test a cone packer is commonly employed and is seated lupon a rat-hole or 'hole of small diameter inthe bottom of the well. 'The shoulder at the top of the l5v rat-hole sometimes crumbles so that it is diflicult to-eiect a seal with a cone packer and other diiculties' sometimes arise as,l for example, where the rat-hole is not exactly centered with respect to the main part of the bore hole.

It is an object of the present invention to devise means and methods forr setting a wall packer in the rat-hole in addition to the cone packer to effectk a double'seal'.

It is another object of the invention to provide 26 means and methods for setting a .wall packer in a rat-hole without employing an anchor pipe or other means'below the packer for supporting it while it is being seated. j

Other objects reside in certain novel features 30 of the-apparatus and'methods as will be more apparent from the following-description taken in connection with the accompanying drawing,

in. which:

Figure 1 is a vertical cross-sectional view of the lower portion of an oil well showing in vertical cross-section a cone packer and a `wall packer in the rat-hole of the well, together with mechanism for setting the same; and

Figure 2 is a vertical cross-sectional view sim ilar to Figure 1 but showing the parts in the relative positions which they occupy when the packers are set.

Referring to the drawing in detail, it will be seen that an oil well is there shown as provided with a borehole Iland a rat-hole I2, the top of the frat-hole providing a shoulder I3.. The apparatus for eiecting a seal in the rat-hole may be connected to the bottom of a testing tool or to other equipment (not shown) which is to 50 be sealed in the well. In thearrangement illustrated, two packers are employed, one consisting of an ordinary cone packer I4 and the other consisting of a wall packer I5.

To support the packers, a mandrel or operating member I6 is provided, theuppei end of which is,

screw threaded as shown at I1 to provide means for connecting it to a testing tool or a pipe. The mandrel extends downwardly through the cone packer I4 and is fastened to the upper shoe I8 of the wall packer I5 by means of a screw threaded 5 connection I9.

The upper shoe 20 of the cone packer I4 isV connected toa sleeve 2I which is in turn connected to the lower shoe 22 of this packer, the shoes and the sleeve being screw `threaded to- 10 gether soas to provide means for compressing the packer I4 and holding it iirmly between the l shoes. The assembly of the packer I4,

shoes

20 and 22, and the sleeve 2l, is mounted for limited longitudinal movement upon the mandrel I6 but 15 is prevented from rotating with respect thereto by means of a key 23 tted into slots 24 in the mandrel I6 and secured to'the upper portion of the sleeve 2l. To prevent leakage through the slots 24, a sleeve 25 is screw threaded onto the 20 upper end of the sleeve 2| and provided with a stuffing box or g1and'28 above the upper end of the slots 24. Y The lower shoe 21 of the wall packer I5 is rigidly connected to the upper shoe 20 of the cone 25 packer I4. To make this connection, an inner sleeve 28 is screw threaded to the lower shoe 21 of the packer I5. This sleeve 28 passes upwardly through the mandrel I6 and is connected to the key 23 which, as mentioned above, is integral 30 with the sleeve 2I and the upper packer 20. The connection at the upper end of the sleeve 28 to the key 23 may be made by simply making slots in the sleeve 28 of the same size as thel keyand passing the key therethrough. 35

In addition to the packing gland 26 near the top of the mandrel I6, an additional packing p gland 29 is provided between the lower shoe 22 of the packer I4 and the mandrel I6 to prevent iiuid flowing upwardly between the sleeve 2I and the 40 mandrel and into the mandrel through the slots IS-and/,will thus constitute an abutment sup-y Qporting the lower shoe 2l of the-wall packer I5 55 the relative positions shown in Figure 2. The

downward pressure necessary to set the wall packerI will be considerable and this pressure will valso be transmitted through the inner sleeve 2l to the upper shoe 20 of the cone packer so as to force thecone packer rmly into position. In

this way a. double seal is effected and even if the shoulder I3 is irregular in shape the wall packer I5 will prevent mud or other ilui'd in the well from flowing downwardly and passing up through the sleeve 28 and the mandrel I6 into the conduit to which it is connected.

In its broader aspects, the invention may be considered as providing means for setting awall packer inv a rathole without the use ofa cone packer. means may be substituted for the cone packer Il and act merely as an abutment for supporting the -lower shoe -ol the wall packer without attempting to effect a seal on the shoulder I3.

Where the term wall packer is used herein, a hollow cylinder of rubber or other expansible material is meant, this cylinder being designed to effect a seal in casing or pipe ,in t e hole.

Where the term rat-hole packer or con'e packer is used herein,a hollow segmental cone of fabric, belting, rubber or like material is meant, this being designed 'to eiiect a seal in 'an open hole at the top of a rat-hole or hole of small diameter drilled in the bottom of a well.

Various changes may be made in the construction or arrangement of the parts and in the methods employed for effecting aseal without departing from the spirit of the invention or the s cope of the annexed claims.

I claim: Y

1. Apparatus for eiectlng a seal between a conduit and a rat-hole in an oil Vwell or the like, which includes a cone packer; a wall packer located belo'w the cone packer, each of said packers having shoes, means connecting the lower A suitable block or other supporting n open hole rather than induit to the upper shoe of the wall packer whereby the cone packer may act as an abutment or support for the lower shoe of the wall packer while the upper shoe thereof is moved downwardly by the conduit to set the wall packer.

2. Apparatus for effecting a seal between a conduit and a rat-hole in an oil well pr the like, which includes means adapted to rest on the shoulder formed Ain the well at the top of the '.rat-hole, a wall packer adapted to enter the rat-hole, means for supporting the wall packer on said means which rests on the shoulder and means for setting the wall packer while it is so supported.

3. Apparatus for effecting a seal between a conduit and a rat-hole in an oil well or the like including, in combination, a cone packer, a wall packer located below the cone packer, a support for the wall packer consisting of a device oonnecting the same to the cone packer and mechanism for setting the cone packer in the top of the rat-hole and the wall packer within the rathole beneath the cone packer.

' 4. Apparatus for effecting a seal between a conduit and a. rat-hole in an oil Awell or the like including, in combination, a cone packer, a wall packer located below the cone packer, a support for the wall packer consisting of a device connecting the same to the cone packer and' conduit and a rat-hole in an oil well or the likev including, in combination, a cone packer, a wall packer located belowthe cone packer and mechanism for setting the cone packer in the top of the rat-hole and the Wall packer withinthe rat-hole beneath the cone packer, said mechanism including a mandrel extending through the cone packer and connected to the wall packer, said mandrel being operable to set the wall packer, nand a member connecting a part of the wall packer to a part of the @ne packer to cause the cone packer to support the wall packer against downward movement during operation of the mandrel toA set the wall packer.

" JOHN wmum.