US1696378A

US1696378A - Hydraulic casing hook

Info

Publication number: US1696378A
Application number: US191403A
Authority: US
Inventors: Brauer Walter
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-05-14
Filing date: 1927-05-14
Publication date: 1928-12-25
Anticipated expiration: 1945-12-25

Description

Dec. 25, 1928.

w. BRAUER HYDRAULIC CASING noon Filed May 14, 1927 2 Sheets-Sheet 2 Sheets-Sheet 2 W. BRAUER Likilifiw HYDRAULIC CASING HO K Filed May 14. 1927 Dec. 25, 1928.

Patented Dec. 25, 1928.

UNITED STATES WALTER BRAUER, OF SEMINOLE, OKLAHOMA.

HYDRAULIC CASING HOOK.

Application filed. May 14,

This invention relates to casing hooks for use with well fishing apparatus and more particularly for use with an overshot for guiding the casing thereinto.

An important object of the invention is to produce a casing hook, which may be employed for grasping casing, which is tilted to one side within an enlargement of the hole, so that it is not accessible to the usual wall or casing hook.

A further and more specific object of the invention is to provide means for connecting the hook with an overshot, such that the hook may be angularly positioned with relation thereto and extend beyond the limits defined by the diameter of the casing through which the hook may be passed.

A further object of the invention is to provide means whereby the hook may be positively moved to its angular position when it has been lowered to the proper level.

These and other objects I attain by the construction shown in the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein:

Figure 1 is a vertical sectional view through an overshot and guide therefor constructed in accordance with my invention, the casing hook being shown in the casing engaging position;

Figure 2 is a similar view showing the easing after it has entered the lower end of the guide;

Figure 3 is a section on the line 33 of Figure 2;

Figure 4 is a section on the line 44 of Figure 2;

Figure 5 is a side elevation of the casing hook removed;

Figure 6 is a section Figure 1.

Referring now more particularly to the drawings, the numeral 10 generally designates a shell adapted to be connected to the lower end of an overshot 11. This shell has slidably mounted therein a sleeve 12, downward movement of which within the shell is limited by engagement of the lower end of the shell and a segmental shoulder 13 produced by thickening the lower end of the shell at its interior about a portion of its circumference. The lower end' of the sleeve has an extension 14, the lower end of which, when the sleeve is seated upon the shoulder 13,

on the line 6-6 of 1927. Serial No. 191,403.

efitrlalnds slightly below the lower end of the s e Pivotally connected to the lower end of the shell is a wall hook 15. This hook, in the present illustration, is disclosed as being pro vided upon the tubular upper end 16 at diametrically opposed points with upstanding circular cars 17 engaging in sockets 18 formed in the wall of the shell. From the ears 17, the upper surface of the tubular upper end 16 of the casing hook inclines downwardly, as at 19, so that this hook may partake of limited oscillation with relation to the sleeve before the upper end of the tubular portion of the hook comes into engagement with the lower end of the shell.

It will be obvious that as the sleeve 12 is moved downwardly, it will come into engagement with the hook and force the same to oscillate, so that the hook, instead of occupying a position where it axially aligns with the shell 1.0, will occupy a position such that its axis is at an angle to the axis of the shell and the bill 20 at the lower end thereof will be deflected considerably to one side or the other of the axis of the shell and accordingly to the axis of the casing through which the shell is projected.

The upper end of the sleeve 12 has socured thereto by a threaded ring 21 a cup leather 22, which engages the walls of the shell and seals the sleeve thereto. Seated upon this ring is a Babbitt ring 23, which is provided in its center with an opening 24, the purpose of which will presently appear. This opening is preferably about one inch in diameter.

In the use of the device, the shell is connected to the lower end of the overshot and the combination, fishing tool thus produced lowered into the well on the lower end of the usual drill pipe string (not herein disclosed). When the lower end of the shell is slightly below the lower end of the well casing and aligned with the cave in which the tilted fish P which is to be removed is located, downward movement is stopped and the pipe line connected with the rotary table and the pump (likewise not disclosed). Pump pressure is then applied and will force the sleeve 12 downwardly, causing the hook 15 to oscillate, so that the bill thereof will operate upon an increased radius to engage the tilted pipe. It is here pointed out that the pumps ordinarily employed with rotary well drilling apparatus supply a suificient volume to build up the necessary pressure for shifting the wall hook in this manner, despite the provision of the central opening in the Babbitt disk. This opening is necessary to prevent dislocation of the disk during downward movement of the fishing tool in event there is any fluid in the bottom of the well. as there generally is. If desired, however, a check valve may be. employed to close the opening 24, as indicated at 25. When the pipe has been engaged and is entered in the lower end of the tubular portion 16, which is preferably slightly flared, as indicated at 16 to facilitate such entry, the string is lowered until the overshot engages over the upper end of the fish. In this lowering operation, the Babbitt disk 23 will be forced upwardly and in event it binds, will crumple, so that it does not interfere in any Way with the movement of the tool.

It will be obvious that a construction of this character will permit the removal of many pipes, which would otherwise be inaccessible for removal and a pipe which is unremovable often causes the loss of a hole, the drilling of which has proceeded for a considerable distance. It will also be obvious that a construction of this character may be very readily and cheaply produced and may be cheaply operated, since the only part which must be replaced after an operation thereof is the Babbitt ring 23. While the Babbitt ring is preferred, any readily frangible material may be employed in its stead.

Since the construction hereinbefore set v forth is capable of a certain range of change and modification without materially departing from the spirit of the invention, I do not limit In self to such specific structure except as iereinafter claimed.

I claim 1. In a guide for overshots, a shell adapted to be connected to the lower end of an overshot and having an inwardly extending shoulder at its lower end, a casing hook having its upper end pivotally connected to the lower end of the shell and a sleeve slidable within the shell having a portion engaging the upper end of said hook to oscillate the same upon the pivot and thereby position said hook at an angle to the axis of the sl1ell,said shell and sleeve permitting passage of a fish upwardly therethrough for engagement with an overshot from which the shell is supported.

2. In a guide for overshots, a shell adapted to be connected to the lower end of an overshot, a casing hook having its upper end ivotally connected to the lower end of the s 1e11, a sleeve slidable within the shell having a portion engaging the upper end of said hook to oscillate the same upon the pivot and thereby position said hook at an angle to the sums of the shell, and means for positively forcing said sleeve downwardly within the shell while the shell is in position within a well bore.

3. In a guide for overshots, a shell adapted to be connected to the lower end of an overshot, a casing hook having its upper end pivotally connected to the lower end of the shell, a sleeve slidable within the shell having a portion engaging the upper end of said hook to oscillate the same upon the pivot and thereby position said hook at any angle to the axis of the shell and a piston seated upon the upper end of the sleeve.

4. In a guide for overshots, a shell adapted to be connected to the lower end of an overshot, a casing hook having its upper end pivotally connected to the lower end of the shell, a sleeve slidable within the shell having a portion enga ing the upper end of said hook to oscillate t e same upon the pivot and thereby position said hook at an angle to the axis of the shell and a piston seated upon the upper end of the sleeve having a small central openmg.

5. In a guide for overshots, a shell adapted to be connected to the lower end of an overshot, a casing hook having its upper end pivotally connected to the lower end of the shell, a sleeve slidable within the shell having a portion engaging the upper end of said hookto oscillate the same upon the pivot and thereby position said hook at an angle to the axis of the shell, a piston seated upon the upper end of the sleeve having a small central opening, and a downwardly seating check valve for closing said opening.

6. In a guide for overshots, a shell adapted to be connected to the lower end of an overshot, a casing hook having its upper end pivotally connected to the lower end of the shell, a sleeve slidable within the shell having a portion engaging the upper end of said hook to oscillate the same upon the pivot and thereby position said hook at an angle to the axis of the shell, means for positively forcing said sleeve downwardly within the shell while the shell is in position within a well bore, and means engaging upon the inner face of the shell engaging said sleeve to prevent rotation thereof and limit the sleeve in its downward movement.

7. In a guide for overshots, a shell adapted to be connected to the lower end of an overshot, a casing hook having its upper end ivotally connected to the lower end of the s ell, a sleeve slidable within the shell having a portion engaging the upper end of said hook to oscillate the same upon the pivot and thereby position said hook at an angle to the axis of the shell and a piston seated ufpon the u per end of the sleeve, the interior 0 the shell aving an enlargement engaging the sleeve and said ortion to limit downward movement of the sleeve and prevent rotation thereof.

8. In a. guide for overshots, a shell adapted to be connected to the lower end of an overshot, a casing hook having its upper end pivotally connected to the lower end of the shell, a sleeve slidable within the shell having a portion engaging the upper end of said hook to oscillate the same upon the pivot and thereby position said hook at an angle to the axis of the shell and a piston seated upon the upper end of the sleeve, said piston being of readily frangible material.

9. In combination with an overshot, an open-ended shell co-axial therewith and connected to the lower end thereof, a casing hook supported from the lower end of the shell and movable with relation thereto from a position where it is axially aligned with the shell to a position where it is disposed at an angle thereto, and means operable while the shell is disposed within a well bore and controllable from the upper end of the bore for positively moving the hook from the first named to the last named position. J

In testimony whereof I hereunto aflix my signature.

WALTER BRAUER.