US1278402A - Reamer-drill for well-boring. - Google Patents

Description

W. M. WALKER.

BEAMER DRILL FOR WELL BORING. APPLICATION FILED FEB.'5. IsII.

wrLnrAM M. WALKER, or rRIsoo, Texas.

' BEAMER-DRILL FOR WELL-BORING.

Lerares.

Specification of Letters Patent.

Patenten sept. ie, iets.

Application filed February 5, 1917. Serial No. 146,691.

like and in such connection it relates more particularly to the construction and arrangementt of thel drill.

Heretofore in the drilling of wells, the drill surrounded by and in'advance of the casing of the well was usually provided with reaming' projections or arms which as 'the drill advanced in the earth or rock would enlarge the hole sucientlyito permit the casing with its couplings to descend in the hole, the drill itself not being adapted to drill a hole of suilicient diameter to accommodate the couplings. In such combined drill and reamer, a rather complicated toggle construction was required to permit of the reamer arms to be drawn or folded inward to permit of the drill being drawn through the casing. l

Some attempts have also been made to form a drill which as it is projected below the casing may expand to drill a hole and team it out to the required diameters. Such structures-however havey not been successfuly for several reasons among which are the following:

ln the drill there was no provision of a groove or. channel between the wings `or Orks of the drill proper for the purpose of permitting the mud, etc., escaping upward in the casing and insuch drill there was no provision for limiting the expansion or separation of the forks of the drill which would occur if the drill struck rock or hard surfaces during the drilling operation.

My present invention contemplates the provision of a drill which may expand as it leaves the casing to form a drill and reamer, said expanding drill having between its diverging forks a groo`ve or channel into which the mud may pass during the drilling operation and which drill also is provided with means for limiting the exwithpansion or separation of the forks as the drill advances through the rock or hard strata.

The nature and scope of my invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof, in which- Figure 1, is a side elevational view of a drill and reamer embodying my invention, the surrounding casing being shown in section, and t-he drill projecting beyond the lower end of said casing.

Fig. 2, is a vertical sectional view of the drill when drawn upwardin the casing, the plane of said section being taken on line 2-2 of Fig. '3.

Fig. 3 is a view similar to Fig. 1 but illustrating the drill drawn up into the casing.

Fig. 4 is an end elevational view of Fig. 3.

Fig. 5 is a cross-sectional view taken on the line 5-5, of Fig. 1, and

Fig. 6 is a cross-sectional view taken on the line 6 6 of Fig. 3.

Referring to the drawings 1 represents the casing which is in sections united together by couplings 2 screwed on the eX- terior of meeting ends of sections 1. Within the'casing 1 the drill is adapted to be lowered, said drill having a screw or other connecting upper end 3 fitting into a sectional drill rod not shown. l

The main body 4 of the drill is formed of tool steel or similar spring metal and its lower or drilling end is divided into two forks 5. These forks 5 each have a main body portion 6 which is flattened `the body portions of the respective forks being contiguous to and riding over each other. The width vof each iat body portion 6 is slightly less than the diameter of the inclosing casj projects beyond the casing the two forks 1 spring apart and the flat bodies 6 slide over each other to make a body which is of larger diameter than either the casing 1 or the coupling 2 as clearly shown in Figs. 1 and 5.

Each drill fork 5 has its dat body provided at either end with a curved cutting flange 7 and 8 respectively and fbetween these flanges a groove 9 is formed into and through which the mud or earth orrock may pass upward as the drill advances. This groove 9 of each fork 5y is what is e termed a mud groove and both grooves 9 terminate at their upper ends in the recess 10 cut into the drill body 4 to form the forks 5 of the drill. This drill body 4 is slightly flattened (see Fig. 2) on two faces to form a continuation of the space or channel through which the mud or"excavated matter may pass upward into the casing.

To prevent accidental spreading of the drill forksduring drilling the inner anges 8 will serve in a measure to hold the drill to its work. In addition to these flanges 8 a positive means for preventing the too wide separation of the forks of the drill is provided. This means consists preferably of one or more pins 11 secured to one at body 6 of the drill and working in` one or more slots 12 formedV in the other dat body 6. lt has been found that two pins and two slots arran ed as lshown in the drawings will be pre erable in securing the two drill forks `together against too wide displacement or breakage during the drilling and reaming operation even should the drill and reamer strike solid rock or other obstruction. i

Having thus described my invention what I claim as new isr- 1. In a device of the character described, a drill having its main body recessed to form two forks, each fork having a flattened body carrying drilling flanges at either edge of the body of the fork, combined with means connecting the fiat bodies of the forks and arranged to limit the expansion of the two forks during-the reaming operation.

2. In a device of thecharacter described,

-a drill having its main body recessed to form WILLIAM M. WALKER.

Witnesses:

C. H. CONKLIN, W. W. AINSWORTH.

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