Title:
Drill bit
United States Patent 2457960


Abstract:
The present invention relates to new arid useful improvements in well drill bits and' has fbr its primary object to provide, in the maniie as hereinafter set forth, novel means for autole&ticealy indicating, while the tool is in operation inr the hole, when said tool becomes worn and dull to...



Inventors:
Walker, William E.
Application Number:
US54040544A
Publication Date:
01/04/1949
Filing Date:
06/15/1944
Assignee:
Walker, William E.
Primary Class:
Other Classes:
73/7, 175/42, 175/421, 340/650, 340/679, 340/691.1, 407/120
International Classes:
B23Q17/09; E21B12/02
View Patent Images:
US Patent References:
2296183Drill bit1942-09-15
2132493Bit1938-10-11
2007465Method and means for indicating the position of a drilling bit in a well casing1935-07-09
1786414Rotary well-drilling tool1930-12-23
1508443Drill bit1924-09-16



Foreign References:
DE201888C
Description:

The present invention relates to new arid useful improvements in well drill bits and' has fbr its primary object to provide, in the maniie as hereinafter set forth, novel means for autole&ticealy indicating, while the tool is in operation inr the hole, when said tool becomes worn and dull to the extent of requiring replacement.

Another very important object of the inveition is to provide a drill bit of the aforementioned character which embodies unique meains- for releasing in the hole an indicating fluid or rmedium to be carried to the surface.

Other objects of the invention are to provide a drill bit of the character described which Will be -comparatively simple in construction, strong, durable, highly efficient and reliable in operation, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the inventior will becone 2 apparent from a study of the following specification, taken in connection with the accompanying drawing, wherein like characters of reference designate corresponding parts throughout the several views, and wherein: Figure 1 is an elevational view of a drill bit constructed in accordance with: the, present invention, a portion being broken away in section.

Figure 2 is a vertical sectional view through one of the blades. 3 Figure 3 is a diagrammatic view of the electric circuit.

Figure 4 is an elevational View, showing a modification.

Figure 5 is a view in horiztontal , taken k 3 substantially on the line 5-5 of Figure 4.

Figure 6 is a view in side elevation of one of the blades of the modification.

Figure 7 is a fragmentary view in elevation of another form other r e invention with a portion 4 broken away in vertical section.

Referring now to the drawing in detail, it will be seen that reference character I designates a holder having mounted thereon a pair of blades 2 having cutting edges 3. The holder I has formed therein a plurality of chambers 4. Ducts 5 extend from intermediate portions of the chambers 4 through the holder I and terminate in closed ends adjacent the cutting edges 3 of the blades 2. 60 The chambers 4 are for the reception of electric batteries 6. Also mounted in the chambers 4, outwardly of the batteries 6 are frangible containers T. A partition 8 divides the containers 7 into a pair of chambers, one of which is filled with a suitable indicating fluid 9 having a distinguishing cdlor, bi do, d etc. The other chambier is for the reception of anh explosive and' has mounted th'erein an electric heating elemnt 1a. The elements 10 are electrically cdnnected to the batteres 6 which, in turin, are grounded to the holder f. Insulated' conductr wires I f are mounted in the ducts anid are connected to the elements 10.

It is thought that the manner in which the invention as thus far described1 fun'ctions Will be readily appareit in' a geriial way from a consideration of the foregoding. Briefly, when the cutting edges 3 of the blades' 2 becotme dull and worn to the point of needing replacement, the insulation is Worn froni the conductor wires I1 and said Wires: are thus exposed arid grounded.

In this manner the electric circuits which include the heating elements. I T are coleted and said 0 elements are heated. The elements I0 ignite the explosive which expels the indicating mediums 9. from, the chambers 4 into' the hole to be carried' to the surface.

fii the modification illustrated in Figures 4, 5 51 and 6 of th6 dra-wing, a c-l; a 12 is mnountedf on theĆ½ usual stem portion 13' of the holder 1. Theb collar 12' ~as' formed therein wells' or chambers 1i4 imillai to the aforeaid chambers 4 for the recepti'hcl of the batteries 6, the con8ainers 7 and 0 the heating elements 10 t herein, etc. Tubular containers 15 of suitable metal are-secured' vertically by welding or o~herwise on either: the front or back faces of the blades 2. The tubular contain s l5:' enclose one end- pbrti'bn of iisulated 5 cohductr-wires 16' ha'vig their other" ends el'edtricaly connected to the elements' 0' in' tfi chambers . 41 In operation; Whei-A the; llctting edges of the blades 2 bieco"6e dull and' w6ear of S ciently, 0 the adjacent end portions of the tubular containers 15 and the corresponding end portions of the insulation on the conductor wires 16 are also worn off. In this manner the conductor wires 16 are exposed for grounding and completSing the electric circuit, thereby heating the elements 10 for igniting the explosives and ejecting the indicating mediums 9 in the containers 14 from the collar 12 to be carried to the surface.

In the modification of Figure 7 of the drawing collapsible bellows type containers 17, for the reception of a fluid 18, are mounted in the chambers 14. Exposed tubes !9 are mounted on the front or back faces of the blades 2 and are connected to the containers 17, said tubes comprising closed ends located adjacent the cutting edges 3 of said blades. Covers 19' are provided for the chambers 14 in this form of the invention. The covers 19' are provided with suitable vents in order that the chambers are internally exposed to all external pressures, thereby making it possible to utilize the reactive spring pressure on the bellows-like containers IT as the differential force with which to eject the indicating medium. Coiled springs 20 are mounted under tension between the covers 19' and the collapsible containers IT to give the necessary fluid ejecting pressure on the containers 17 when occasion requires.

In operation of the embodiment of Figure 7 of the drawing, the closed ends of the tubes 19 are worn off when the cutting edges 3 of the blades 2 become sufficiently dull and worn to require replacement. When this occurs the containers I7 are collapsed by the coil springs 20 for ejecting the fluid 18 therefrom through the tubes 19 into the hole to be carried to the surface.

It is believed that the many advantages of a drill bit constructed in accordance with the present invention will be readily understood and although preferred embodiments are as illustrated and described, it is to be understood that further modifications and changes in the details of construction may be resorted to which fall within the scope of the invention as claimed.

What I claim is: 1. In a drill bit including cutting edges, a closed container mounted on said bit and containing an indicating material, there being a communicable passage extending from said container and terminating at a point within said cutting edges, an explosive cooperatively associated with said container, a source of electric current carried by said bit and grounded to the latter, an ignitible element operatively associated with said explosive and electrically connected to said source, and a conductor insulated from said bit extending through said passage and having one end connected to said ignitible element and its other end positioned in the termination point of said passage, whereby wearing away of the cutting edges to an extent such as to remove the insulation from the end of the conductor complemental thereto and bring said conductor into electrical contact with said bit causes the ignitible element to ignite the explosive and upon the ignition of the explosive to open the container and discharge the indicating material into the surrounding hole.

2. In a drill bit including cutting edges, a closed container mounted on said bit and containing an indicating material, there being a communicable passage extending from said container and terminating at a point within said cutting edges an explosive cooperatively associated with said container, a source of electric current grounded to said bit and electrically connected to said explosive, and a conductor insulated from said bit extending through said passage and having one end connected to said source and its other end positioned in the termination point of said passage, whereby wearing away of the cutting edges to an extent such as to remove the insulation from the end of the conductor complemental .0 thereto and bring said conductor into electrical contact with said bit causes the ignitible element to ignite the explosive and upon ignition of the explosive to open the container and discharge the indicating material into the surrounding hole.

- 3. In a drill bit comprising a holder, blades provided with cutting edges mounted on said holder, a plurality of chambers in said holder, each of said chambers having an electric battery and a frangible container containing an indicating material mounted in spaced relation therein, an explosive interposed between said frangible container and said battery and cooperatively associated with said container, said battery being grounded to said holder, an ignitible element operatively associated with said container and electrically connected to said battery, ducts extending from each of said chambers and terminating at a point within the cutting edges of said blades, and conductor wires insulated from 3, said holder extending through each of said ducts, each of said wires having one end thereof connected to said ignitible element and the other end positioned in the termination point of said duct, whereby wearing away of cutting edges to 35an extent such as to remove the insulation from the ends of the conductor wires complemental thereto and bringing said conductor wires into electrical contact with said holder causes the ignitible element to ignite the explosive and upon ignition of the explosive to open the container and discharge the indicating material into the surrounding hole.

WILLIAM E. WALKER.

45 REFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS 50 Number 1,508,443 1,786,414 2,007,465 2,132,493 55 2,296,183 Name Date Christian ---------- Sept. 16, 1924 Kennedye ---------- Dec. 23, 1930 Burt .------------ July 9, 1935 Phipps ------------Oct. 11, 1938 Richard ------ - Sept. 15, 1942 FOREIGN PATENTS Number Country Date 201,888 Germany ------------------ 1908