US2297157A - Drill - Google Patents

Description

J. MccLlNToN sept. 29,v 1942.

' DRILL FiledNov. 16, 1940 Y 2 Sheets-Sheet l NVENTOR C/mzn.

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SePf- 29, 1942- J. MocLlN-roN DRILL Filed Nov. 16, 1

Patented Sept. 29, 1942 UNITED STATES FATENT OFFICE DRILL l John McClinton, Houston, Tex.

Application November 16, 1940, Serial No. 365,909

(Cl. Z55-61) 2 Claims.

This invention relates to a drill.

An object of the invention is to provide a drill specially designed for use in deep well drilling and which may be used in either soft or hard formation.

It is a further object of the invention to provide a drill of the character described embodying novel means for operating both against the bottom of the bore as well as against the side wall of the bore with guide means on the drill head for holding the cutting means positively and rmly against the work.

Another object of the invention is to provide a drill of the character described having a head and cutting means and guide means thereon so related as to cause the drill to follow a straight course so as to prevent deflection of the bore.

With the above and other objects in View .the

invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specication and illustrated in the accompanying drawings, wherein:

Figure 1 shows a side View of the drill.

Figure 2 shows a cross-sectional view taken on the line 2-2 of Figure 1.

Figure 3 shows a cross-sectional View taken on the line 3 3 of Figure 1.

Figure 4 shows a fragmentary view of the drill taken on the line 4-4 of Figure 5.

Figure 5 shows a longitudinal, sectional View of the drill.

Figure 6 shows a side view taken at right angles to the View shown in Figure 1.

Figure '7 shows a bottom end view, and

Figure 8 shows a cross-sectional View taken on the line 8--8 of Figure 5.

Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the gures, the nui meral I designates the drill head which is, preferably, cylindrical in shape and whose upper end is internally threaded to receive the externally threaded pin member of .the drill stem 2. The

lower end of the head is approximately of an in- J verted, conical shape as shown in Figure 6. At one side the head has a vertical, dove-tailed groove 3 extending from the lower end thereof upwardly and terminating at the shoulder 4. A dove-tailed shank 5 is fitted upwardly into said groove and may be secured therein by bolts as 6 and may be also welded in place, if desired, by the weld l.

The lower end of the shank diverges downwardly relative to the axis of the head forming an anchor 8. The outer end of the anchor is beveled presenting a vertical, outside face 9 and the inner side of the anchor presents the bearing face I0. Extending inwardly at approximately right angles to the bearing Ill of the anchor there is a spindle I I preferably formed integrally with said anchor and on which is mounted to rotate a irusto-conical shaped rolling cutter I2 whose outer surface is suitably toothed to penetrate the formation as shown. The rolling cutter I2 is mounted to rotate about the spindle on suitable roller bearings I3. Its outer, or large, end presents an annular bearing face I4 which bears against the face I ll and its inner end is conical in form. If desired, a gasket I6 may be fitted around the spindle II and countersunk into the corresponding end of the rolling cutter I2.

Above the upper end of the shank 5 and preferably aligned therewith and formed integrally with the head there is a side reaming cutter I 'I terminating in a forwardly directed sharp reaming edge I8. It will be noted from an inspection 'of Figures 1 and 8 that surrounding the annular face I4 of the rolling cutter I2 there is an annular series of cutting teeth I9 on said rolling cutter and it will be noted from an inspection of Figure 5 that these teeth I9 operate against the side wall of the bore at the bottom of the bore while the other, or surface teeth of the rolling cutter I2 operate directly on the bottom of the bore as the drill rotates.

Opposite the rolling cutter I2 there is a cutting blade 20 secured on the lower end of the head. This cutting blade terminates in a forwardly directed cutting edge 2I to operate on the bottom of the bore as illustrated in Figures 5 and 6. This blade 2l) is preferably welded to the lower end of the head by the weld 22.

As the drill rotates the rolling cutter I2 will penetrate into and disintegrate the formation at the bottom of the bore and the blade-like cutter will follow the rolling cutter and remove the disintegrated material ahead of it, which material will be carried from the well by the circulating drilling iluid in the well known manner. This drilling fluid is circulated downwardly through the drill stem and through the drill head and is discharged out onto the cutters through the channels 23, 24 through the head and is returned up through the bore outside of the drill stem.

Formed integrally with the head and arranged opposite the reaming cutter II there is a guide, or stabilizer, 25 which extends longitudinally of the head and extends out radially to the outer side of the cutter 20. This is more clearly shown in Figures 1, 2 and 8. The outer side of the guide, or stabilizer, is curved to approximately the curvature of the bore and rides against the wall of the bore to hold the reaming blade l1 and the rolling cutter l2 rmly against the opposite side of the bore so that they will effectively operate against the side as well as against the bottom of the bore. This tends to hold the drill steady and to cause it to follow a straight course thus preventing the formation of a deflected or crooked bore.

The arrangement of the rolling cutter and the blade-like cutter at the bottom of the drill makes provision for a drill of this type which will very effectively penetrate soft as Well as hard formations.

The drawings and description are illustrative merely and are not intended to restrict the invention except as the same may be dened by the appended claims.

What I claim is:

1. A drill for forming an earth bore comprising a head, an anchor depending from the head at one side having a downwardly and outwardly inclined bearing face, a frusto-conical rolling cutter mounted on the anchor to bear against said face and to rotate on an axis perpendicular to said face and having peripheral teeth thereon to engage the bottom of the bore and outer end teeth to engage the side Wall of the bore, a cutter blade on the head positioned substantially opposite the rolling cutter and adapted to cut the material at the bottom of the bore disintegrated by the rolling cutter, a stabilizing guide on the head and in approximate alignment with the cutter blade and a reamer on the head in approximate alignment with the rolling cutter and disposed approximately opposite the guide and having a forwardly directed reaming edge.

2. A drill for forming an earth bore comprising a head, an anchor depending from the head at one side having a downwardly and outwardly inclined bearing face, a frusto-conical rolling cutter mounted on the anchor to bear against said face and to rotate on an axis perpendicular to said face and having teeth thereon to engage the bottom of the bore as the cutter rotates, a cutter blade on the head positioned substantially opposite the rolling cutter and adapted to cut the material at the bottom of the bore disintegrated by the rolling cutter, a stabilizing guide on the head and in approximate alignment with the cutter blade and a reamer on the head in approximate alignment with the rolling cutter and arranged opposite the guide.

JOHN MCCLINTON.

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