US1858926A - Oil tool device - Google Patents

Description

Ma 17, 1932. H, E, G U ET AL 1,858,926

, OIL TOOL DEVICE Filed March 27, 1928 2 Sheets-Sheet l I INVENTOR.

n GM W 50 m MJ W 5 Y B May 5 17, 1932. H. E. GRAU ET AL OIL TOOL DEVICE Filed March 27, 1928 2. .Sheets-Shegt 2 INVENTOR. Herberi E. Grau; Andrew .J'. C01memuer',-'

' ATTORNEYS.

Patented May 17, 1932 UNITED STATES PATENT DFFICE HERBERT E. GRAU', F LOS ANGELES, AND ANDREW J. COLMERAUER, OF REDONDO I BEACH, CALIFORNIA OIL TOOL DEVICE .Application filed March 27, 1928.

This invention relates to oil tool devices, and particularly to an underreaming bit.

The invention has for an object the provision ofan oil tool device which is so formed and constructed as to permit a jarring thereof at any interval desired during a boring operation.

Another object is the provision of a rotary bit so formed and constructed that the blades of said bit may expand to perform a drilling operation to the end that a well hole of greater diameter than the casing may be out.

Another object is the provision of a rotary bit which may readily pass through a well casing of a selected diameter, to cut a hole of greater diameter than the well casing and which bit is readily collapsible whereby the same may be withdrawn, as desired.

Another object is the provision of a rotary bit so formed and constructed as to permit complete circulation therethrough.

Another object is the provision of a rotary bit wherein and whereby the blades of said bit are so carried as to relieve strain from the carrying point during a cutting operation.

Other objects will appear as the specification proceeds, which includes a device which is simple in structure, efficient in operation, inexpensive to manufacture, easy toassemble, and generally superior in results obtained.

With the above and other objects in view, the invention consists in the novel and useful provision, formation, construction and interrelation of parts, members and features, all as shown in certain embodiments in'the accompanying drawings, described generally, and more particularly pointed out in the claims.

In the drawings:

Figure 1 is an elevation of one form of our improved rotary bit,

Figure 2 is a vertical sectional view of the bit shown in Figure 1 and on an enlarged scale from the showing of Figure 1, the blades being in collapsed condition, 7 V

Figure 3 is a view similar to Figure 2 with the blades in expanded position,

Figure 4 is a fragmentary elevation of the blades and associated parts of the bit,

Serial N0. 265,056.

Figure 5 is an end elevation of the bit and bit head,

Figure 6 is a cross-sectional view on the line 66 of Figure 2, V

Figure 7 is a vertical sectional view of a modified form of the bit, the blades being in collapsed condition, Y

Figure 8 is a view similar to Figure'7, the blades being in expanded position, and

Figure 9 is a fragmentary side elevation of that form of the invention shown in Figures 7 and 8 and illustrating certain features thereof.

Referring now with particularity to the drawings, that form of the invention illustrated in Figures 1 to 6 inclusive is designated as an entirety by A, and the form of the invention shown in Figures 7 to 9 inclusive by B.

The form of the invention designated as A'will be described first, and the same includes a bit head a adapted to receive a mandrel b and which mandrel is adapted tocooperate with blades 0 carried by the bit head. The bit head is substantially an annulus and is provided with internal screw-threads 1, which are adapted to cooperate with corresponding screw-threads 2 carried by the mandrel and particularly that portion of the mandrel 3. One end of said mandrel is tapered or provided with a conical wall 4 while the opposite end carries an enlarge- -ment 5 provided with a pin 6. The enlargement 5 is provided with what may be termed a jaw 7 which is formed by canting the base of the enlargement lying between the periphery of the enlargement and the part 3. Themandrel is formed with a central bore 8, whereby fluid such as water may be passed therethrough and. out through the tapered ,drive head.

The bit head has one end provided with a jaw 9, which is formed the same as the jaw 7, which is to say the end is canted. Likewise, said bit head is tapered on two sides at that portion adapted to carry the blades, as shown in Figures 1, 4 and 5, at 10. That portion of the bit head which lies between the tapered surfaces, shown at 10, is slotted at 11; It will be noted that the bore of the bit head is not uniform in diameter and that portion of the bore which would be between the tapered portions is of lesser diameter than the remaining portion of the bit head and that the diameter at this portion progressively diminishes as shown at 12. This portion of diminished diameter corresponds to the general taper of the drive head of the mandrel. 1

The blades 0 are pinned or otherwise secured for swinging engagement within the slots 11, as shown at 13, and these blades in the present instance may be of any form desired although they are shown as of the fish-tail type, and said blades normally lie within the confines of the slot 11, when the mandrel is out of engagement therewith. When the mandrel, however, is moved downwardly within the bithead by screwing the bit head and mandrel together, the conical drive head of said mandrel is received between said blades and forces the same apart and outwardly from said slots 11 into the position shown in Figure 3. In this connection, the blades are so formed as to best cooperate with the conical drive head which is to say that both blades are formed with tapered drive head engaging walls 14. Furthermore, when the blades are in the position of Figure 3, it will be seen that the said blades are cooperating with the bit head and in the following manner. As both blades are identically constructed, one thereof will be described. Referring to Figure 6, it will be seen that the blade is formed with butts or lugs 15 on both sides of the blade and that said butts or lugs are adapted to cooperate with complemental abutments 16 formed in the blade carrying end of the bit head. Thus when the blades move from the position of Figure 1 to that of Figure 2, it will be seen that the lugs or butts engage the abutments and limit further outward movement of said blades in the bit head. Furthermore, these lugs and abutments cooperate in such a manner that strain is relieved from the pins or connections 13 between the blades and the bit head when the blades are in a position of operation.

The bit head is formed with a shoulder 17, and likewise provided with openings 18 through which openings bolts or stops 19 may be passed for engagement with the mandrel. These bolts or stops act to limit movement of the mandrel in upward direction when the said stops engage the flange or shoulder 17, and likewise act as a stop when the mandrel is completely screwed to the bit head, said stops striking the wall portion or shoulder portion that exists between the portions of two diameters in said bit head.

The operation of the device A just described is as follows: Assuming that it is being lowered by tubing through the casing,

the blades will be in collapsed position, as

shown in Figure 2, and after the drill is passed through the casing the mandrel may be turned relative to the bit head so that they may be screw-threaded together and the drive head of the mandrel will force the blades apart. In this position, it is evident that the blades will cut a greater diameter or bore than the diameter of the casing as the blades can be of considerable width and will hang in a collapsed condition, as shown in Figure 2, due to the placement of the pins or connections 13. The drive head, of course, will hold the blades in tight engagement with the abutment of the bit head, and if a jarring operation becomes necessary, the bit head and mandrel may be unscrewed slightly and then again screwed so that the jaws will suddenly engage. This separation of an engagement between the jaws will perform the jar desired.

That form of the invention shown in Figures 7, 8, and 9, and designated as B does not difier in essential details from that form of the invention just described and all parts which are similar in structure and nature are given the same reference characters. In the present instance, the bit head at is formed at one end with a box 10, and with a bore of small diameter 4-1 leading from said box and joining with a tapered bore 42 which finally communicates with a bore 43 of greater diameter than the greatest diameter of the tapered bore 42. The bit head is provided with diametrically disposed radial slots 44: within which slots are placed blades 6. The lower edge of both blades is formed with a depending part 45, and the depending parts are received within a groove 16 of the bit head, and which groove communicates directly with the slot within which the blades are movable. The clearance openings or bores 18 are provided as before and the mandrel is constructed the same as before. Each blade is provided with a tapered drive head engaging wall 17 and said blades are like wise beveled at 48 between the top wall L9 and the side wall 50 thereof. The length of the slot is suiiicient to permit the blades to be inserted in position therethrough after which looks 51 are placed in position. These locks comprise angle members having a base portion 52 and a side portion 53, the side portion being secured in any suitable manner to the portion 5a of the bit head. This form of the device may carry further lengths of tubing secured to the box and the blades may be moved from the position shown in Figure 7 to that of Figure 8 at any time desired upon the lowering of the mandrel. The casing surrounding said mandrel is shown in dotted lines at 55 and when the mandrel is released from its engagement with the blades and the device as an entirety is pulled upwardly, the beveled edge 48 of the lades will contact with the lower end of the casing and cam the blades within the slots of the bit head, whereby the device may be passed upwardly through the casing.

In the operation of both devices, it is intended that a fluid such as water may be passed through the opening 8 of the mandrel so that the Water or other fluid may constantly clear the dbris or cuttings from that portion where the cutter blades are operating on the formation and likewise keep the blades cool. The device is so constructed that a suitable number of threads between the mandrel and the bit head are always in engagement so that there is no danger of stripping threads due to lifting of the bit as an entirety from the casing or well hole. The stops act to indicate to the operator when rotation between the mandrel and bit head may be terminated. Both forms of the device provide a means for supporting the blades during the cutting operation, it being evident that the form B has ample support in that the Walls of the bit head bounding the slot through which the blades are passed secures said blades against side movement.

It is obvious that various changes, modifications and variations may be made in practicing the invention in departure from the particular showing of the drawings without departing from the true spirit thereof.

Having thus disclosed our invention, what We claim and desire to secure by Letters Patent is:

1. In an oil tool device, an annular bit head, the bore of which is tapered adjacent an end thereof, a transverse slot in said bit head at the zone of said tapered bore, blades pivotally depending from said bit head at an end thereof and normally confined within said slot, a mandrel formed with a tapered end for reception within said tapered bore to contact with said blades and positively move the same outwardly from the slot.

2. In an oil tool device, an annular bit head, the bore of which is tapered adjacent an end thereof, a transverse slot in said bit head at the zone of said tapered bore, blades pivotally depending from said bit head at an end thereof and normally confined within said slot, a mandrel formed with a tapered end for reception within said tapered bore to contact with said blades and positively move the same outwardly from the slot, the opposite end of said bit head being provided with a jaw and said mandrel being provided with a cooperating jaw to permit jarring action of the device when the mandrel is moved in one direction relative to the bit head.

In testimony whereof we have signed our names to this specification at Los Angeles, California, this 13th day of March, 1928.

HERBERT E. GRAU. ANDREW J. COLMERAUER.

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