US1259340A - Casing-perforator. - Google Patents

Description

L. F. BAASH.

CASING PERFORATOR. APPLICATION FILED smmzs. ma.

Patented M11212, 191s.

nun

LAWRENCE F. BAASI-I, 0F FILLIVIORE, CALIFORNIA.

CASING-PERFOBATOR.

Application filed September 26, 1916.

To all whom it may concern:

Be it known that I, LAWRENCE F. BAAsI-I, a citizen of the United States, residing at Fillmore, in the county of Ventura and State of California, have invented new and useful Improvements in Casing-Perforators, of which the following is a specification.

This invention relates to a perforator and particularly pertains to a device adapted to perforate holes through the walls, of well casing.

It is an object of this invention to provide a tool adapted for simultaneously perforating a well. casing at opposite sides and to provide an apparatus consisting of a minimum number of parts which is easily manipulated and positive in action. 7

Other objects will appear as the description proceeds.

My invention consists in the combination, construction and arrangement of parts hereinafter described and claimed.

The invention is illustrated, by way of example, in the accompanying drawings, in which:

Figure l is a view in side elevation illustrating the complete perforating tool and particularly disclosing the cutter advancing mechanism with one of the springs broken away for the sake of clearness.

Fig. 2 is a view in elevation as seen in the direction of the arrow on Fig. 1.

Fig. 3 is a fragmentary view in elevation illustrating on an enlarged scale the locking means provided the cutter mechanism.

Fig. 4 is a view illustrating the lower end of the perforator and particularly discloses the cutter operating mechanism as in its locked position.

. Fig. 5 is a fragmentary view of the lower end of the perforatoras seen in section and as illustrating the locking mechanism provided the cutters.

Fig. 6 is a fragmentary view in section and elevation illustrating in a diagrammatical manner the initial contact between one of the cutter teeth and the casing wall.

Fig. 7 is a view similar to Fig. 6 and illustrates the cutter tooth as having formed a perforation through the wall of the casing.

Referring more particularly to the drawings, 10 indicates a perforator body which is substantially cylindrical in shape and is formed with a shank 11 at its upper end. The shank 11 is reduced in diameter at its end and is threaded to permit it to be readily Specification of Letters Patent.

Patented Mar. is, rare. Serial N0. 122,241.

mounted within a coupling member which will secure it to the end of a rod by which it is suspended in the casing. The shank 11 is formed with flats 12 which permit it to be screwed into position. The portion of the perforator body disposed below the shank 11 is formed with a pair of longitudinally alined cutter slots 14.- and 15, which extend entirely through the body for the reception of cutter wheels 16 and 17. These wheels are provided with spindles l8 and 19 upon which they are rigidly secured and which are adapted to move along angular slots 20 and 21 formed through the body member at right angles to the slots 1 and 15. The portion of the cutter body through which the slots pass is machined to provide oppositely disposed parallel faces 22 and 23 upon which a cutter wheel mechanism is adapted to reciprocate.

It will be noted that the slots 20 and 21 are formed with their angular portions extending in opposite directions from the ce11- ter of the body member and that the faces 22 and 23 are correspondingly positioned. This allows a back portion 24 to occur along one side of the faces to act as a guide for slide plates 25 and 26 which constitute a portion of the cutter wheel operating mechanism. These plates are formed integral and are adapted to bear upon the faces 22 and 28 respectively of the body, and have transverse slots 27 formed through them which are engaged by the ends of the cutter spindles. It will be understood that the plates are in pairs upon opposite sides of the perforator body and are held in position by means of longitudinally extending leaf springs 28 and 29. These springs are secured upon opposite sides of the perforator body by bolt 30 to the slide plates 25 and extend. downwardly therefrom. Bolt 30 extends through the slots 20 and may be advanced therealong as will hereafter be explained. The lower ends of the springs are secured to each other by a bolt 31 which extends along slots 21 thus holding the plates 25 and 26 in position upon their sliding planes.

In Fig. 1, the upper guide 24 is at the right hand side of the face 22 and the lower guide 24. is at the left hand side. of the face 23, and the spindle 18 moves to the left while the spindle 19 moves to the right, when the body 10 is lowered relative to the perforating mechanism.

When the perforator is being lowered into a well it is desirable to positively prevent the cutter wheels from coming in contact with the wall of the casing thus impeding its movements therethrough. This is accomplished in this device by means of a lock pin 32 which is mounted within a transverse bore 33 formed across the lower end of the body member and parallel to the bolt 31. The pin 32 is formed with a head portion 34 and has a pair of oppositely disposed transverse slots 35 adjacent to its other end.

These slots form a reduced neck like a button adapted to be engaged by a lock slot 36 formed upon an extension of one of the slide plates 26. Reference being had to Fig. 3, it will be seen that this slot has an enlarged opening at its upper end for permitting the free passage of the pin 32 through to allow the neck 35 to register with the main portion of the slot. The pin 32 is normally drawn within its recess by. a coil spring 37 acting beneath its head to positively insure the release of the cutter wheel operating mechanism when desired.

The perforation of casings has required considerable time in the past due to the manner in which the cutter blade efiected an opening through the casing wall. The cutter wheel having a tooth as particularly shown in Figs. 6 and 7 of the drawings, is

designed to overcome this difficulty. The

wheels preferably are formed with a plurality of teeth radially disposed and having a beveled or backed-0E cutting end. The teeth are longest upon the back sides so that the end faces of the teeth will strike flat against the face of the casing. This peculiar formation permits the cutting end of the tooth to abut squarely against the interior of the casing atthe cutting moment, and will thus shear through the pipe along all of its edges as the perforating proceeds, thus pro ducing a clean-cut hole from which a portion of the wall has been punched. It will be readily seen that such a cutting action is theoretically correct and will produce re-' sults greatly to be desired both as to the work done and the time andpower required to accomplish it. F orwardly beveling the cutting ends also provides a clearance so that the teeth will not hook to the casing in withdrawing the teeth after the holes are punched.

As a means for relieving the friction which normally would occur between the interior of the casing and the surface of the perforator body a series of anti-friction ball bearings 38 are embedded with the face of the member in a manner readily to be rotated and will thus allow the device to be manipulated with considerable ease. V

In operation the device is set, as is shown in Figs. 1 and 2 of the drawings,'by forcing.

the pin 32 outwardly to engage the slot 36 and prevent the movement of the slidable plates 25 and 26, and consequently of the cutter'wheels 16 and 17. When the proper depth has been obtained, the perforator body is drawn upwardly, and, as the leaf springs 28 and 29 are in intimate contact with the casing wall, they will remain in a constant position; As the perforator is raised, the pin 32 will slide along the slot 36 until it reaches the enlarged upper portion thereof at which time it will move back into the recess 33. The actuating mechanism for the cutter wheels will then be freeto move, and as the perforator body is again lowered the spindles of the cutter wheels will be advanced along the slots 20 and 21 and move to a position in contact with the casing wall. Further lowering of the device will cause the teeth of the cutters to form perforations in opposite sides of the casing, as indicated in Fig. 7 of the drawings. The device may then be withdrawn by lifting it as the cutter wheels will instantly be retracted. It will be understood that power may be delivered to 'thedevice by a plunger rod which is connected to the jars of the well rig. I

It will thus be seen that the perforator here disclosed is simple in operation and construction, and will efliciently produce a series of-perforations through a well casing with a relatively small amount of power and with ease of operation.

I claim: 7

1. A casing perforator comprisinga substantially cylindrical body member having flattened faces at opposite sides and a longi-' tudinal slot extending through the'body at right angles to said faces, said faces being provided with alined slots communicating with said first-named slot, said alined slots having their lower portions vertical and their upper portions at an angle thereto, a

slide plate mounted on each of said flattened faces, said plates being provided with cuttcrwheel'bearings, a cutter-wheel mounted in said bearings, having its teeth disposed in said longitudlnal slot, a pair of springs rigidly secured to said plates, and means op erative on the initial raising of the casing perforator forcausing said springs to frictionally engage the said casing and hold the same in stationary relation thereto during said flattened faces being in alinement with corresponding slots on the other flattened face, a plurality of slide plates mounted on said flattened faces and provided with cut ter-wheel bearings, a cutter-wheel for each pair of oppositely disposed slide plates mounted in said bearings, the teeth of said cutter-wheels being disposed in said longitudinal slot, a pair of springs rigidly secured to said plates, and means operative on the initial raising of the casing perforator for causing said springs to frictionally engage the casing to be perforated and to remain in stationary relation thereto during the perforating operation.

3. A casing perforator comprising a substantially cylindrical body member having a longitudinal slot extending therethrough, a pair of alined slots at right angles to said longitudinal slots and communicating therewith, the lower portion of said slotsbeing vertical and the upper portion at an angle therewith, a pair of slide plates on opposite sides of said body, and movable along said last-named slots, a cutter-wheel mounted in said plates, having its teeth disposed in said longitudinal slot, and means rigidly secured to said plates and operative on the initial raising of the casing perforator for engaging the casing to be perforated and to remain in stationary relation thereto during the perforating operation.

4. In a casing perforator, a body member having upper flattened faces at opposite sides and lower flattened faces at opposite sides, said upper and lower faces being offset relatively to each other and there being guides along corresponding sides of the upper faces and guides along corresponding sides of the lower faces, the upper guides being at opposite sides of the faces from the lower guides, and there being a longitudinal slot extending through the body at right angles to the faces and each pair of faces being provided with a transverse slot at right angles to the longitudinal slot, the lower portions of said transverse slots being longitudinal and the upper portions of said slots being oppositely inclined, slide plates mounted on the flattened faces and against the guides and having cutter wheel bearings transversely elongated, cutter wheels in the longitudinal slot and having spindles extending into the elongated cutter wheel bearings; so that as the slide plates move up wardly relatively to the body the cutter wheels will move laterally and project their teeth beyond the body; means for holding the slide plates in position to withdraw the cutter wheels while the perforator is being pushed downwardly into a casing, and means to cause the'slide plates to stick in the casing and force the cutter wheels outwardly to perforate the casing.

5. In a casing perforator, a body member having flattened faces at opposite sides, there being a longitudinal slot extending through the body at right angles to thg faces, and said faces being provided with transverse slots at right angles to the longi tudinal slot, the lower portions of the transverse slots being longitudinal and the upper portions being oppositely inclined, slide plates mounted on said flattened faces and having cutter wheel bearings, cutter wheels mounted in the longitudinal slot and having spindles extending into the cutter wheel bearings; so that when the slide plates are down the cutter wheel teeth are withdrawn and when the slide plates are up the cutter wheel teeth are extended; and springs rigidly secured to the slide plates for engaging a casing and holding the slide plates during thev perforating operation.

6. In a casing perforator, a body having a longitudinal slot extending therethrough, transverse slots at right angles to the longitudinal slot, the lower portions of the transverse slots being longitudinal and the upper portions being oppositely inclined, a pair of slide plates on opposite sides of said body, bolts connecting the slide plates through the transverse slots, cutter wheels in the longitudinal slot and having spindles extending through the transverse slots and through the slide plates; so that when the slide plates are down relatively to the body the cutter wheel teeth are withdrawn and so that when the slide plates are up relatively to the body the cutter wheel teeth are oppositely extended; there being a transverse bore through the body member and a registering slot through one of the slide plates, a lock pin in said transverse bore, and a spring for withdrawing the pin, said lock pin being adapted to button into said slot and hold the slide plates in position to hold the cutter wheels withdrawn while the perforator is being insorted into a casing and so that by raising the body the lock pin will unbutton and withdraw and release the perforating mechanism for operation.

In testimony whereof I have signed my name to this specification.

LAVVRENOE F. BAASH.

Goploa oi this patent my be obtained for five cents each, by addressing the "Commissioner at Patents, Washington, D. 0.

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