US2135024A

US2135024A - Drill

Info

Publication number: US2135024A
Application number: US141589A
Authority: US
Inventors: George J Barrett; Robichaux Sosthene
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-05-10
Filing date: 1937-05-10
Publication date: 1938-11-01
Anticipated expiration: 1955-11-01

Description

Nov. 1, 1938.

G. J. BARRETT ET AL DRILL Filed May 10, 193'! Patented Nov. 1, 1938 PATENT" OFFICE.

DRILL George J. Barrett and Sosthene Robichaux,

Houston, Tex

Application May 10, 1937, Serial No. 141,589

6 Claims.

This invention relates to a drill and has particular relation to that type of .drill to be used in drilling wells through rock or. other hard formation.

It is an object of the invention to provide a drill having a plurality of side cutters for disintegrating the formation at the outside of the bore as the drill progresses and having suitable cross-rollers at the lower end of the drill for disintegrating the material at the bottom of the bore.

In a preferred embodiment of the invention more than two side cutters are provided, there being preferably four. side'cutters as shown. The major portion of the work is performed'by the rolling side cutters and they are subjected construction for mounting the cross-rolling cutters for disintegrating the central portion of the bore.

It is another object of the invention to provide a drill of the character described that is of simple construction and which may be readily assembled or dismembered for repairs and replacements.

With the above and other objects in view the invention has particular relation to certain novel ing member.

usual passageway 3 downwardly therethrough' Figure 4 shows a fragmentary, sectional view of another embodiment.

Referring now more particularly to the drawing wherein like numerals of reference designate the same parts in each of the figures, the numeral l' designates the drill head which is upwardly'extended and formed with the shank 2 for connection to the drill stem or other driv- The shank and head have the for the discharge 'of the drilling fluid. The

- lower end of the head isformed with the spin- .dle anchors 4,1 and 5, 5, which arespac'ed'apart aroundthe lower end of the head and whoseinner sides present the flat bearing

faces

6, 6 and l, 1, which diverge downwardly.

Converging inwardly and downwardly from the anchors 4, 4 are the

spindles

8, 8 and converging inwardly and downwardly from the anchors, 5, 5, are similar spindles .9, 9.

The

outer ends of these spindles, in assembly, may

be fitted through bores as It! through the corresponding anchors 4, 5, and then welded in place, as more clearly shown in Figure l.

Frusto-conical shaped rollers II, II are rotatably mounted on the spindles 8 and frustoconical shaped rollers l2, H are rotatably mounted on the spindles 9. In a preferredem=- bodiment of the invention the rolling cutters II are oppositely disposed and the rolling cutters l2 are also oppositely disposed as more clearly shown in Figure 3. These cutters are provided with external cutting teeth which roll about the outer portion of the bottom of the bore, and disintegrate the hard material encountered.

There is a bridge l3 whose upper end is circu- I lar and concaved, said upper end being fitted into a correspondingly shaped countersunk groove l4 around the lower end of the passageway 3 and preferably'welded in place. This bridge has the depending legs l5, l6 which are spaced apart and which have transversely aligned bearings to receive the spindle I'I. One end of this spindle may be an enlarged head l8, if desired, and the ends of the spindle are arranged adjacent, but are not connected to, the opposing faces l9, l9, into which the inner ends of the spindles 8 are formed.

Mounted on the spindle ll between the legs l5, [6 there is a rolling cutter 20. This rolling cutter,'as shown, is approximately frusto-conical shape in form with its smaller end located.

left between the

cutters

20 and 22 and the cutter 22 is so located that it will disintegrate that portion of theformation left between the cutter 2| and the cutters l2.

It will be noted that the cutters 12 are extended inwardly further than the cutters II, the arrangement being such that the cross-rolling cutters 20, 2|, 22 will traverse the entire area at the bottom of the bore not disintegrated by the side cutters I i, I2.

Since the major portion of the work of the drill will be performed by the side cutters II and I2, a greater number of said side cutters have been provided than is now commonly used so that each side cutter will be subjected to less wear than would otherwise be the case and the full diameter of the bore will thus be maintained. In the embodiment shown in Figure 4 the bridge B21 is provided with only the depending leg IS in which the spindle IT has a bearing and in this form said spindle I! may have one end, or both ends if necessary, welded to the adjacent spindle, or spindles, 8. The bridges l3, l3a are provided with suitable ducts as 23 whereby the flushing fluid may be delivered onto the respective cutters.

If desired, the leg may be laterally braced by means of the braces 24 which are welded thereto and to the inner end of the spindles 9 as more clearly shown in Figure 3.

As indicated in Figure 1 the side rolling cutters H, l2 are mounted to rotate on anti-friction *rollers 25 and ball bearings 26.

In assembly the cutters may be slipped over 7 this process. The raceways in which the balls 26 ride will then be in registration and these balls may be inserted into their raceways through suitable gates, left in the spindles for that purpose and the gates then plugged up by welding in the usual manner. The spindles may then be inserted through the bores l0 and welded therein and the bridge with the cross-rollers assembled thereon may be welded into place and the drill thus completed. P

It may be found most practical to make the bores l0 in-the form of slots extending down to the ends of the anchors 4, 5 inrwhich case the rolling cutters ll assembled on their spindles 8 and the bridge [3 with the cross-rolling cutters mounted in place thereon may be inserted as a unit into place, the outer ends of the spindles 8 passing up into said slot-like bores l0 and these parts may then'be permanently welded in position and the side cutters l2 assembled on their spindles 9 may then be inserted into the position shown in Figure 2 and the spindles 9 welded in place' and thereafter the braces 24 may be formed on the head and arranged to disintegrate the formation at the bottom of a well bore and some extending inwardly further than the others and rolling cutters on the drill mounted to'rotate on a transverse axis and arranged to disintegrate the formation at the centralportion of the bore. 1

3. A drill comprising ahead, four downwardly and inwardly converging spindles thereon, outside frusto-conical rolling cutters on said spindles arranged to disintegrate the formation at the outer portion of the bore, each of said cutters being of a unitary structure and some extending inwardly further than the others, a leg anchored to the head and depending therefrom, means connecting said leg to some of said spindles, a

transverse rolling cutter support on the leg whose 1 ends are adjacent other of said spindles andcross-rolling cutters on said support arranged to disintegrate the formation at the central portion of the bore.

4. A drill comprising a head, four outside rolling cutters mounted to, rotate on the head and arranged to disintegrate the formation at the bottom of the, well bore, each cutter being of a unitary structure and two oppositely disposed of said cutters extending inwardly toward the axis of the drill further than the other of said cutters and rolling cutters on the drill mounted to rotate on a transverse axis and arranged to disintegrate the formation left at the central portion of the bore by said outside cutters.

5. A drill comprising a head, four spindle anchors depending from the head and spaced apart approximately a uniform distance around the head, downwardly converging spindles on the anchors, frusto-conical shaped cutters mounted to rotate on said spindles, each cutter being of'a unitary structure and two opposing cutters extending inwardly further toward the axis of the head thanrthe other two cutters.

6. A drill comprising a head, a transverse spindle at the lower end of the head, rolling cutting means on the spindle arranged to disintegrate the formation at the central portion of the bore, four outside frusto-conical rolling cutters on the head spaced apart in approximately uniform distance around the head, two opposing rolling cutters extending inwardly toward the center of the head further than the other two of said roll ing cutters.

GEORGE J. BARRETI. SOS'I'HENE ROBICHAUX.