US1636896A - Core drill - Google Patents

Description

July 26, 1927,

L. F. BONNEY CORE DRILL Filed Dec. 11. 1926 \w\ v \\\V\\\\\ Patented July 26, 1927.

UNITED STATES PATENT OFFICE.

LY'N'N I. BONNEY, OF LOS ANGELES, CALIFORNTA, ASSIGNOR T OIL'WELL CORE DRILL- ING COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

CORE DRILL.

Application filed December 11, 1926. Serial No. 154,080.

This invention relates'to a core drill, and refers particularl to the type of core drill which is employe in taking cores during the drilling of wells, such as oil wells.

In the drilling or taking of cores from core drills, the cutters or cutting parts of the drill are subjected to rapid wear. This necessitates a repeated replacement of the cutting parts of the core drill.

An object of the present invention is to provide a core drill with a novel form of detachable cutter.

Various further objects and advantages of the present invention will be understood from a description of the preferred form or example of a core drill embodying the invention. For this purpose, reference is made to the accompanying drawings, in which:

Figure 1 is an elevation mainly in vertical section,

Figure 2 is a section on the line 22 of Figure 1,

Figure 3 is an elevation. of the detachable cutter for the core drill, and,

Figure 4 is a fragmental elevation of the lower end of the core drill with the cutter removed.

Referring to the drawings, 2 indicates the lower end of a string of pipe employed for supporting and rotating the core drill in the Well holes 3 indicates a core receiving barrel for the core drill which barrel, it is understood, may as usual be of any desired length and normally is provided at its upper end with a' check valve (not shown). The core receiving barrel is threaded near its lower end, as indicated at 4, to a head" 5. The head 5 in turn has its upper end threaded as indicated at 6 to a tool joint 7 which, in turn, is threaded as indicated at 8 to the lower end of the stand of drill pipe 2. The core barrel 3 is of smaller'outer diameter than the inner diameter ofthe tool joint 7, thus providi an annular space'9 therebetween by Whlifil flushing fluid may be passed from the stand of drill pipe to the core drill head 5. The core drill head '5 is cut away, as indicated at 10, to provide a downwardly facin annular shoulder, and below said shoul er.10, the head tapers or curves inwardly, as indicated at 11. The head 5 is also provided with a plurailty of downwardly extending and circumferentially spaced apart lugs 12 which thus form radial extenslons ofthflower end of the head. Said core drills The head 5 is also provided with a plurality of radially extending openings 15 tapering. to contract outwardly, said openings 15 being formed in the head 5 in the rear'part of the lugs 12.

16 indicates a detachable cutter forthe core drill which has a sliding fit with the lower end of the head 5, the upper end of the cutter 16 engaging the shoulder 10. The major portion of the cutter 16 is tapered or curved downwardly and inwardly, as indicated at 17, fitting the outer surface of the tapered or curved end 11 of the head 5. Through the cutter 16, there are provided vertical openings 18 fitting the lugs 12 of the head 5, the cutter 16 thus being provided with a plurality of torque receiving bearing faces 19 engaging the bearing faces 14 of the head. The cooperating torque receiving bearingl faces 14 and 19 resist the torque load upon t e cutter 16 and head 5 during drill-' ing operations, and thus prevent said load from being applied to the means for locking or holding the cutter 16 upon the head 5.

The cutter 16 may be provided with any desired form or shape of cutters adapted for, cutting cores in well drilling, being indicated as having thecore cutting teeth 20 together with the lower set of reaming cutters 21 contiguous with the lower end of the core cutting teeth 20. There is also preferably pro vided a plurality of enlarged reaming cutters 22, the lower ends of which terminate above the core cutting teeth 20 so that said core cutting teeth have a lead or are advanced infront of the large reaming cutters 22. All of said cutters may be an inte ral part of the head 16,

although it is un erstood, in practice, that they may be detachably secured thereto and even when integral therewith maybe of a different or harder composition than the rest of the cutter head, being attached to the rest of the cutter head by being welded thereon.

The cutter 16 is also preferably provided with an openin 23 adjacent each lug 12 of the head 5 for supplied to the core ischarging the flushing fluid rill in proximity to fluid is discharged from ports 23 immediate- 'lyadjacent the cutting edges of at least a part of the cutters 22, thereby being deposited in a position for most effective cooling of the cutters and for most effectively washing and clearing away the detritus formed thereby.

The cutter 16 is provided with tapering openings 24 aligning with the openings 15 in the lugs 12 of the head 5 and said openings receive tapered pins 25 which serve to support and lock the cutter 16 on the head 5. The inner ends of said pins 25 are in turn engaged by the core barrel 3 whereby they are locked in position.

The core drill also includes a core catcher 26 of any suitable design such, for example, 'as formed by spring fingers 27. While said spring fingers 27 are indicated as formed on a separate annular ring 28 below the core barrel '3, it is understood that said ring might constitute an integral part of either the barrel 3 or the head 5 or cutter 16.

By the construction of core drill here in described, all of the cutting parts of the drill are formed detachable from the remainder of the drill with the result that they may be readily removed and others substituted therefor when worn. Moreover, the detachable cutter 16 is positively secured or locked to the core drill by means preventing any of the torque or load applied to the drill being imposed upon the locking means. Thereby, there is provided a core drill assembly by which the detachable cutters may be very readily and easily engaged and dis engaged. Moreover, the construction of core drill thus described provides a means for discharging the flushing fluid from the cutters at the most desirable point.

While the core drill herein described is well adapted for carrying out the objects of the present invention, various modifications and changes maybe made without departing from the invention and the invention includesall such modifications and changes as come within the scope of the appended claims.

I claim:

1. A core drill comprising a head, a core receiver secured to the head, a cutter loosely fitted to the head, and pins locking the cutter upon the head, said pins being locked in place by engagement with the core receiver.

2. A core drill comprising a head, a core receiver secured to the head, the head having a plurality of circumferentially spaced apart lugs, flushing passages extending through said lugs, a cutter having a loose fit with said head, there being cooperating torque receiving bearing faces between said cutter and said lugs, and openings in said cutter communicating with the flushing passages within said lugs.

3. A core drill comprising a head, a core receiver secured to the'head, means for securing a drill pipe to the head, said head being provided with a plurality of circumferentially spaced apart outer lugs, a cutter having a loose fit with said head, the head and'cutter having cooperating torque thrust receiving faces, means for passing flushing fluid through the head and cutter, registering openings in said head and cutter tapering to contract outwardly, pins fitting said openings, and a member secured to said head engaging the inner ends of said pins for locking the same in place.

4. core drill comprising a head, means for securing the head to a drill pipe, a core receiver secured to the head, lugs on the head a cutter having a loose fit with said head and engaging radial shoulders on said lugs the cutter being provided with both core drilling and reaming teeth, and means for detachably locking the cutter to the head.

Signedat Los Angeles, California, this 3 day of December 1926.

LYNN F. BONNEY.

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