US 1987291 A
Description (OCR text may contain errors)
Jan. 8, 1935. GLiWlTZKl I 1,987,291
COMBINED WIDENING AND GUIDING TOOL FOR BORING WELLS Filed Feb. 20, 1952 INVENTOR I ATTORNEY Patented Jan. 8, 1935 UNITE STATES PATENT OFFICE COMBINED W'IDENING AND GUIDING TOOL FOR BORING WELLS 1 Claim.
This invention refers to an improved tool comprising a Widener and guide to be used in the boring of wells and which is illustrated in the accompanying drawing, wherein:
Fig. 1 is an elevation of a tool constructed according to my invention for use with rotary drills.
Fig. 2 is an end view thereof.
Fig. 3 shows a modified form of drill.
' Fig. 4 is an end view thereof.
Fig. 5 shows another modification of my invention.
Fig. 6 is an end view thereof.
Fig. '7 shows a further modified form of drill.
Fig. 8 is an end view thereof.
Fig. 9 shows a still further modification of the tool.
Fig. 10 is an end view thereof.
This improved boring tool comprises a threaded body (1) provided with various blades or fins (2) adaptable for the widening of the diameter of the well and maintaining in perfect working position the whole of the boring outfit. The material to be used in the manufacture of the invention, is that which is usually employed in the construction of boring tools, although alloys of a hard and resistant metal may also be added to the parts exposed to friction with the ground to be drilled. Thethreads(3) whichserve to unite the tool object of this invention to the remaining boring tools may be made in accordance with the experience gained by practical tests with the dilferent systems.
The improved combined tool may be applied directly to the upper part of the boring instrument (drill or crown) or separated from same by means of reductions, master bars or boring pipes. One or more of these combined tools may be used at one time, excepting cases where excentric boring is being carried out, in which case only one of these tools is to be used. The fins or blades of the combined tool serve to rectify the section of the well, excavating the earth which has not been touched by the drill or crown due to these having been slightly worn by friction during the perforation. This avoids frequent replacing of the drills and eliminates the necessity of reboring the well with a drill, cross mouthed borer or Widener. Due to the position of the various blades or fins and specially when several of these combined tools are used at once, the whole of the tools are maintained in working position, which also guarantees a vertical perforation with rotary systems, where up to the present day, the instrument which only operates at the bottom, for various reasons, and sometimes due to the twisting or decentralization of the bars was easily deviated from operating in a vertical direction.
It is evident that the setting of a pipe in a well vertically drilled and of an even diameter does not afford any dilficulty in the carrying out of the operation.
In the systems where perforations are being carried out by means of cables, an additional advantage is obtained by diminishing the danger of the tools being damaged or broken.
Up to the present day when using this system the master bar remains suspended without any guide and as the drill tool hits the bottom of the well, the master bar is violently bended and therefore causes the breakage of the union threads. The lower portion generally remains inclined also and hinders the fishing operation, as when this is being carried out the inclination increases and causes the upper extremity of the lost portion to enter the walls of the well, thus making the fishing operation an impossibility. When the combined tool, object of this invention is employed, the lateral movement of the master bar is avoided by the guiding action of the blades or fins and this prevents any breakages. Furthermore in the case of fishing operations, the upper end of the lost portion is maintained in the center of the well. i
This combined tool is also adaptable for the carrying out of the so called eccentric perforations, if the blades are disposed in asymmetrical position as shown in Fig. 3, of rotary systems as shown in Fig. 4 (for percussion systems). In this case it is only possible to employ a combined tool, because by placing several, these would not maintain exactly the same eccentrical position in relation to each other, and it would not be possible to pass the whole outfit through the pipes.
In perforations made by the crown system, three combined tools are applied at one time, viz:
- one on top of the crown, one in the middle of the boring pipe (or between two boring pipes) and the third on top of the last boring pipe. The advantage obtained would be identical to those obtained in perforations done with the drill tool.
It is evident that modifications may be eifected in the construction and details of the invention without departing from the scope of same.
Having thus described the nature of my invention and the manner in which same may be put into practice, what I claim as new and wish to protect by Letters Patent, is:
In a well boring tool, an elongated central body having an upper offset and threaded end, and a lower threaded central bore for coupling the tool to the line of drill pipe and to other tools, and a plurality of fins or blades outwardly extending from said central body symmetrically and asymmetrically arranged thereto, one of said fins or blades subdivided into a plurality of blades and projecting from said central body for a longer distance than the others, said blades having bevelled outer edges.