US2188409A

US2188409A - Wire line pipe cutter

Info

Publication number: US2188409A
Application number: US126347A
Authority: US
Inventors: Edward K Lane
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-02-18
Filing date: 1937-02-18
Publication date: 1940-01-30
Anticipated expiration: 1957-01-30

Description

Jan. 30, 1940. E, K LANE 2,188,409

WIRE LINE PIPE CUTTER Filed Feb. 18, k1937 2 Sheets-Sheet l Jan. 30, 1940. E. K. LANE WIRE LINE PIPE CUTTER mi M. w n m M f w m mw.. SII L m .m d 7 E 2 I l K //m lm y. m5. 7 g Si 1G m ./M 4x z Ei m, d b. VM HM/ w e H Z II-I'IJ/l/ f n l. i .l f

Patented Jan. 30, 1940 'ijf- :UNITEDv STATES PATENT GFFICE 2,188,409 WIRE` LINE PrPE CUTTER EdwardK. Lane, Houston, Tex. Appucatinrebrafy .18, 1987, ;k serial No. 126.347 4 Claims'. (01.' isi-0.7)

My invention relates vto pipe cutters adapted for cutting pipe in wells.- It-pertains'more particularly to inside pipe cutters wherein the cutter `is lowered downwardlyv within the pipe to be cut oif. i

Pipe cutters of the general character of that which forms the subject matter of this invention are more or less common but almost without exception they are mounted upon a string of pipe which has to be lowered into and again removed from the well with a large consumption of time in so doing. It is an object of the invention to provide a pipe cutter which may be lowered into the well on a wire cable and to be then actuated to sever the pipe and withdraw the pipe from the well.

I aim to provide a pipe cutter which is of simple construction and which may be positivelyoperated in the well to engage and cut the pipe at vany desired level.

It is also an object of the invention to provide means for holding the device in inoperative position until it reaches the point in the well where it is to be operated. v

The invention also resides injthe particular construction and arrangement of the parts making up the device and these will be `better understood from the description which follows.

In the drawings,

Figs. 1 and 2 are side views, partly in section, and shown within a well casing, Fig. 1 illustrating the upper portion of the device and Fig. 2 representing the lower end thereof.

Fig. 3 is a transverse section on the plane 3--3 of Fig. 1.

Fig. 4 is a similar transverse section-on the plane 4-4 of Fig. 2.

Fig. 5 is abroken sideview partly in section and partly in elevation showing the cutter head with the cutters advanced. v

Fig. 6 is a similar view with the parts in retracted position.

Fig. '7 is an assembly view showing the device in the well and illustrating the structure partly in section and partly in elevation.

With reference particularly to Fig. l'I it-will be seen that my device is adapted tobe lowered in the well at the end of a cable I. Said cab-le is secured at its lower end to a head 2 of an operating shaft 3. The head 2 is cylindrical adjacent its lower end and has a radially extending sho-ulder 4 over which may :be engaged the spring arms 5 of the ancho-rsleeve 6. y

'Ihis construction is shown somewhat venlarged in Fig. 1 and it will be seen that the spring arms 5 have their upper ends inclined yinwardly and hooked so as to engage over the shoulder 4, thus holding 'the 'anchor sleeve 6 in raised position along the shaft. The shaft 3 extends downwardly in-an axial position relative to the assembled device and extends through the entire construction for a suitable distance below the same. is formed with a coarse spiral groove or thread lvLthejpurpose.of which is to rotate the cutter headI when the l shaft is moved upwardly.

. The anchor sleeve 6 is slidable longitudinally of the shaft but is held from rotation thereon by -means of a key 8, which, as shown in Fig. 1, extends inwardly from the sleeve and engages .withinj a longitudinal groove or keyway 9 in the shaft. The sleeve is thus slidable but nonrotatable on the shaft. The lower end of the anchorv sleeve has an upwardly tapered expanding head III` thereon. As will be see'n from Fig. 3, this head I0 is provided with opposite flattened surfaces upon which the cutter dogs II and I2 may engage. There is a dovetailed connection between the expander head and the jaws I I and -I2 soI that the jaws will be held firmly against the side of the head as they are moved longitudinally thereon.

I l The jaws lII are formed with teeth thereon` which are arranged transversely and, as will be seen in Fig. l, said teeth are inclined upwardly so as to resistan upward pull on the device when it is anchored. The jaws I2 on the other hand are formed with longitudinal teeth which engage the pipe I3, which is to be cut, and resist rotation of the anchor.

The said jaws are suspended on links or arms ,Ill. which depend from an upper weight block I 5.v Saidblock is slidable along the anchor sleeve andtends-to -push the jaws downwardly into pipeengaging position. `This downward movement of the jaws is resisted by a spiral spring member I6. which is supported at its lower end upon a collar I'I xed by means of the screw I8 upon the anchor sleeve; 'I'his supporting spring I6 is comparatively strongand ordinarily holds the weight block and the dogs upwardly away from expanded position rupon the head I0.

. l The lower end of the anchor sleeve is extended down below the expander head and is reduced in diameter, as shown at I9 in Fig. 2. This downward extension onthe sleeve is formed yat itsv extremity with an internal threaded socket 20 within which the cutter expanding mandrel 2| is screwed. This. downward extension upon the anchorsleeve provides a swivel attachment with said rsleeve of a relatively rotatable cutter head 22. The connection of the cutter head with the anchor sleeve is formed by a row o-f balls 23 which forms an anti-friction raceway between the head andthe sleeve and also prevents relative longitudinalmovement of the cutter head uponthe sleeve, Between the upper end of the cutter h ead and the shoulder on the sleeve is an anti-friction ybearing 24 which takes up the thrust between the head and the sleeve.

Cil

The cutter head has a lower nipple or projection thereon which engages closely against the shaft and has an inwardly extending thread 26 thereon engaging with the groove or thread 1 upon theshaft. It will thus'be seen that when the shaft is drawn upwardly relative to the rotatable head 22 the head will be caused to rotate.

The cutter head is formed with an inner.`

chamber 21 within which is housed the mandrel 2| and the upwardly tapered expanding member thereon. B-elow the expanding member the outer diameter of the mandrel is reduced to form a shoulder 29 below which the mandrel is cylindrical. The upwardly tapered portion of the mandrel forms an expanding means which tends to engage with cutters: 3B and move them outwardly as the mandrel is moved relatively upwardly.

The cutters 30 are shown in Figs. 2 and 4 and it will be seen that I have employed four such cutters. Each cuter is approximately rectangular in cross section and its outer end is formed into a cutting point 3|. The inner end of the cutter pin engages against the mandrel 28. There is a spring 32 surrounding each cutter and tending to move the cutter inwardly and hold it firmly against the outer surface of the mandrel.

The cutter head isY fixed against rotation relative to the mandrel 28 by means of radial connecting pins 33, said pins being screwed through the outer wall of the cutter head and radially into the slot 33' in the mandrel. They serve to connect the two members together so that as the head is rotated the mandrel will be also rotated in a direction to screw the mandrel upwardly within the socket 2l) yin the anchor sleeve. This movement of the mandrel will obviously advance the cutters until the pipe has been severed and the further movement of the mandrel will allow the spring 32 upon the cutter to force the cutter back below the shoulder 29 on the mandrel.

In'the use of my device the parts are assembled in the position shown in Figs. 1, 2 and '1, and are lowered downwardly to the desired level where the pipe is to be cut. To set the anchor and x the anchor sleeve firmly in position an upward jerk on the cable will tend to move the anchor sleeve upwardly and advance the anchor jaws Il and l2 so as to firmly engage the casing. An upward tension on the cable thereafter will hold the device firmly fixed in position. 'I'he upward jerk on the cable also `releases the spring arms 5 at the upper end of the anchor sleeve so that the shaft may be moved upwardly relative to the anchor.

The upward movement of the shaft through the anchor device will impart a rotative movement to the cutter head. This rotative movement carries the cutters around in contact with the inner surface of the pipe to cut the same. The rotation of the cutter head also screws the mandrel 28 upwardly into the threaded socket 20 and the engagement of the tapered surface of the mandrel with the inner ends of the cutter pins will force the cutters gradually outward until the pipe has been severe-d. The lower extension upon the operating shaft will be regulated to impart to the cutter head the desired number of rotations to assure that the pipe is severed before the shaft is moved upwardly through the device beyond a certain point. An enlargement upon the lower end of the shaft may be formed to limit the upward movement of the shaft in the cutter block and furnish a support therefor so that after the pipe has been severed it may be withdrawn upwardly with the device from the well.

.The advantage of my lconstruction lies in the speed with which the cuts may be made and the sections of pipe withdrawn from the well. It

"will be obvious that the cutter assembly may be loweredina very short time to the level where the cut is to be made and the device may be then quicklyv operated to cut the pipe and by oontinued upward pull on the cable the pipe may lIt is therefore expeditious in its operation and simple in construction.

What is claimed as new is:

1. A cutter for pipe in wells, including a shaft adapted tobe'supported by a cable, an anchor sleeve slidable but nonrotatable on said shaft, means responsive to an upward jerk on 4said shaft tol anchor said sleeve in the pipe to be cut, a cutter head rotatably supported on said anchor sleeve,\a coarse spiral groove in said shaft, mea-ns on said head interiitting in said groove to impart rotative movement to said head as said shaft is moved longitudinally relative to said head, cutters movable outwardly in said head, an upwardly tapered mandrel in said head engaging said cutters to move them, and means operable by the rotation of said head to move said mandrel upwardly.

2. A cutter for pipe in wells, including a shaft adapted to be supported by a cable, an anchor sleeve slidable but nonrotatable on said shaft, means responsive to an upward jerk yon said shaft to anchor said sleeve in the pipe to be cut, a cutter head rotatably supported by said anchor sleeve, a c'oarsespiral groove in said shaft, means on said head interiitting in said groove to impart rotative movement to said head as said shaft is moved longitudinally relative to said head, cutters movable outwardly in said head, an upwardly tapered mandrel in said head engaging said cutters to move them, a threaded connection of said mandrel with said sleeve, and means on'said head connecting with said mandrel to screw it upwardly in said sleeve as said head is rotated and thus advance said cutters.

3. A wire line pipe cutter for wells, including a cable, a threaded shaft thereon, an anchor sleeve mounted slidably but nonrotatably on said shaft, means actuated by a jerk on said cable and said sleeve to fix said sleeve against upward movement in the pipe to be cut, a-downward extension on said sleeve, a cutter head, a swivel connection for said head on said sleeve, said head being screwed upon said shaft, cutters housed in said head,` and means in said head engaging said sleeve to move said cutters outwardly to cut said pipe as said shaft is moved upwardly in said head to rotate the same.

4. A wire line pipe cutter for wells, including a cable, a threaded shaft thereon, an anchor sleeve mounted slidably but nonrotatably on said shaft, means actuated by a jerk on said cable and said sleeve to fix said sleeve against upward movement in the pipe to be out, a cutter head rotatably supported on said sleeve, said head being screwed upon said shaft', Icutters housed in said head, a tapered mandrel threaded to said sleeve and engaging said cutters and means to move said mandrel upwardly to advance said cutters. Y

EDWARD K. LANE.