US1919510A - Apparatus for lowering pipes in wells - Google Patents

Description

July 25, 1933 G. G. HARRINGTON APPARATUS FOR LOWERING' PIPES IN WELLS Filed Aug. 51, 1931 /wwww L ATTORNEY.

Paten-ted `luly 25,V 1933 UNITEu sTaTEs PATENT *orTlcE GEORGE G. HARRINGTON, F HOUSTON, TEXAS, ASSIGNOR TO REED ROLLER BIT COM- PANY, 0F HOUSTON, TEXAS, A CORPORATION OF TEXAS APPARATUS FOR LOWERING PIPES IN WELLS Application led August 31, 1931.

This invention relates to apparatuses for lowering pipes in wells.

The rotary drill stem employed in deep well drilling comprises a pipe made in sections and having on its lower end a drill bit. When the drill pipe is long, and its length sometimes exceeds a mile, it is very heavy. For reasons well known to those skilled in the art, it must beremoved from and then again lowered into the well as the drilling proceeds. To reduce the strain on the hoisting apparatus when the drill pipe is lowered into the hole, a float valve is now mounted in the drill pipe to prevent the passage of the water in the well upwardly therethrough. A portion of the weight of the pipe is thereby placed upon the water in the well. But although the conventional float valve performs a good service while the-pipe is being lowered, it is not removable from the 2@ pipe while the pipe is in the well, and this is objectionable for several reasons. One conventional drill bit is adapted to be lowered through the drill pipe and to automatically assume a cutting position on the lower end '725 of the pipe; and to be removed through the pipe when worn to be replaced by a new bitall while the pipe is in the well. It will be obvious that this bit cannot be used when the conventional float valve is used because the float valve obstructs the passage through the pipe.

This invention has for its principal object the provision of a new and improved float valve that can be removed yfrom the drill pipe while the pipe is in the well so that such drill bits may then be lowered into place through the drill pipe.

The invention will also be found useful in lowering into a well casings, linings, tubings, and other pipes; because, while the oat valve may be used advantageously whilethe pipe is being lowered, it maybe removed after the pipe is in place so that the passage through the pipe is unobstructed. l p

Other objects will hereinafter appear.

The preferred embodiment of the invention is illustrated by 'the accompanying drawing, of which Fig.` 1 is a sectional elevation of the valve carrier in a pipe; Fig. 2,` a horizontal section on the line 2-2 of Fig. 1; Figs. 3 and Seral No. 560,359.

this pipe, I provide a section 2 having an internal annular groove 3 to form shoulders'to be engaged by the dog 4 of the valve Acarrier 5.

The carrier 5 is substantially cylindrical to fit within the section 2, but its upper portion has tiattened sides 6 (Fig. 2) to form with the pipe fluid passage-ways that communicate v with the transverse passageways 7 and axial passageway 8. Movable in a lcage 9 on thev lower end o fthe valve carrier and urged upwardly against the seat 10 by the spring 11 is a float valve 12. Surrounding the carrier are y a plurality of packinglrings 13 to seal the space between the carrier and the pipe section.

The dog 4 is pivoted at 14 in the transverse slot 15 of the carrier and l is connected to a reciprocable plunger 16 by the pin 17 fitting 1n elongated slot 18. The dog 4 is urged into the groove 3 by the spring 19. Y l

The plunger 16 has a head 20 adapted to be engaged by the fingers 21 `(Fig. 5) of the overshot 22.

rllhe lioat valve may be used as follows: T he carrier 5 may be inserted in thie pipe section 2 until the dog 4 reaches and is forced into the groove 3 by the spring 19. ,The dog 4 will then serve to prevent movement of the carrier in the pipe section.

The pipe section 2 may then be connected to form a section of the pipe 1 at the desired point.

[The pipe 1 may then be lowered into the well. The valve 12wi'll prevent the passage of water or other fluid in the well upwardly through the carrier, so that there will be no fluid in the pipe 1` above the carrier. A portion 'of the vweight of the pipe is thereby placed upon the fluid in the well.

When the pipe has been lowered to a predetermined point, water may then be pumped into the pipe 1 above the carrier. The water will pass downwardly through the passageways 7 and 8 of the carrier and will open the may readily be removed therefrom. 'lhen' the overshot 22, attached to the conventional wire line, not shown, may be lowered until its fingers 21 engage the head 20 of the plunger 16. When the overshot is elevated, the plunger 16 will be moved upwardly in the carrier 5, the pin 17 moving upwardly in the slot 18 to withdraw the dog 4 from the groove 3, against the resistance of the spring 19. Then the carrier will be moved upwardly through and out of the pipe 1.

The invention is not limited to the preferred embodiment herein disclosed. Various changes may be made within the scope of the following claims:

I claim:

1. A well pipe valve carrier having a iuid passageway therethrough, a oat valve in said passageway, a pipe engaging carrier holding dog movable into active and inactive positions, and means to move said dog into its inactive position. y

2. A well pipe valve carrier having a iuid passageway therethrough, a 'loat valve in` said passageway, a packing surrounding said carrier, a carrier holding pipe engaging dog mounted on said carrier so that 1t 1s movable into active and inactive positions, and `a plunger slidable in said carrier and connected to said dog to move said dog into its inactive position.

3. The combination with a well pipe having an internal shoulder, of a valve carrier having a movable holding dog, a spring to urge said dog into engagement with said shoulder to hold said carrier in said pipe, a plunger to move said dog out of engagement with said shoulder, a iuid passageway, a iioat valve in said passageway, and a packing to seal the space between said carrier and said pipe, said carrier being removable through said pipe.

4. The combination with a well pipe having an internal shoulder, of a valve carrier and a float valve in said carrier, said carrier having a movable holding dog to engage said shoulder, a plunger, said dog being moved by said plunger out of engagement with said shoulder when said plunger is pulled upwardl whereupon said carrier may be removedY upwardly through said pipe.

5. The combination with a well pipe, of a Valve carrier and a ioat valve in said carrier, said carrier having holding means to engage said pipe and prevent upward movement of said carrier in said pipe, said holding means being releasable from said pipe by an upward pull, whereupon said carrier may be removed upwardly through said ppe.

GEORGE G. ARRI'NGION.

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