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Publication numberUS1830625 A
Publication typeGrant
Publication dateNov 3, 1931
Filing dateFeb 16, 1927
Priority dateFeb 16, 1927
Publication numberUS 1830625 A, US 1830625A, US-A-1830625, US1830625 A, US1830625A
InventorsSchrock George W
Original AssigneeSchrock George W
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Drill for oil and gas wells
US 1830625 A
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Description  (OCR text may contain errors)

Nov. 3, 1931. 5, w, s o 1,830,625

DRILL FOR OIL AND GAS WELLS Filed Feb. 16, 1927 ATTORNEY Patented Nova? 1931 (moms w. scnaocx, or mnoao,.1nmo

mm. ton on. mass wELLs Application filed Iebr'uary .18, 1927. Serial No. 168,752.

This invention relates to drills and more particularly to cable rock drills used in bormgoil and gas wells.

i A primary object of the invention is to provide a drill of this character having a one ,piece head provided with aplurality of bits or cutters of different types so arranged as to effectively cut across each others path through the rock and so produce a round hole 10 without necessitating the use of other tools,

and which'cutters are adapted to be changed fre uently to provide for drilling a hole of uniiorm' size throughout. 7 Another'object' is to so mount the hits or 16 cutters in the head-that they may be readily .removed by the operator for sharpening or replacing when dulled, thus saving expense vention,

Fig. 2 is a similar view taken in a plane at 80 right angles to Fig.1,

. ig. 3 is a transverse vertical section through the head of the drill with the shank broken off for convenience in, illustration,

Fig. 4 is a bottom plan view of the tool with the bits in place, and

Fig. 5 is a similar view of the head with the bits removed.

In the embodiment illustrated a solid substantially cone-shaped head 1 is shown which merges at its apex into a shank or stem 2 provided at its upper end with a reduced threaded terminal 3 for'connection with the drilling apparatus. A plumb or guide r' 4 is mounted on the upper end of the shan 2 being seated on a shoulder 40 formed at the inner end of a reduced portion 2a ofthe shank. This plumb ring is secured in tion by a set screw' 5 passin radially em ,n through and engaging the each provided with an angular portion 17 to with a plurality of longitudinally extending peripherally spaced sand grooves 6 between which in the head are formed sockets 8 arranged obliquely as shown in Fig. 3 to receive the threaded shanks 14 of the cutters or bits, four of which are here shown and which have said shanks extended-in longitudinal alinement with the bodies of the cutters. A central s0cket7 is larger in size than those and is designed to receive a master cutter 9 which is made in the form of a bull bit, with a reduced threaded rear end for insertion in the socket 7. The sockets 8 are inclined upwardly and inwardly as shown in Fig. 3 so that the bits 10, 11, 12 and 13 which are mounted therein are inclined outwardly at their cutting edges to provide a clearance for the four cutterswhile drilling. This arrangement of the bits 8 and their sockets adapts the cutting strain to beborne by the head 1 and not at the 70 'junctionz giif the bits with the head such as would-be' liable to shear off the bits at this point, These cutters are arranged in pairs, those of each pair being diametrically oppo site each other two of said'cutters being 0111881 cutters and two bull bits. The cutters or bits are held in their sockets by set screws 16 as shown clearly. in Fig. 3 and are preferably receive a wrench for screwing them into and out of the sockets. The two chisel bits 10 and '11 are set opposite each other with cutter edges on two sides of the head and the two bull bits 12 and 13 are set with their cutting corner edges from the center to the outer edge of the drill base on two sides as is shown clearly in Figs. 1 and 4 while the master drill, bit 9 is set with the cutting corner edges to the center of the two chisel bits so that all of the rock. will be cut out since these bits cut across each others paths thereby insuring the formation of a round hole without necessitating the use of any other tools.

The master bit 9 has mounted in the riphery' thereof four screws arranged at 'ametrically zgiposite points so' that the heads 18 thereof 1 thespa'c'es between the master bit and the other bits and said heads are made I K I concave on their outer faces to fit the shanks The outer face of the head 1 is provided of -the cutting. bits as shown at 19 in Fig. i-

2 l f I 1,880,095

These screws 18 which are threaded into the master bit 9 operate to hold thebits 10 '11, 12 and 13 rigidly in cutting osition and t us insure the o eration of the its in unison.

5 From e above description, it will be obvious that this drill has its head and shankconstructed from a single piece whereby strength and durability are, provided and the conesha ed or beveled construction of the head m wi the bit receiving sockets arranged at an incline provide a clearance for the bits while mg. Without further description, it is thought that thefeatures and advantages of the in-,- 15 vention will be readily apparent to those skilledin the art, and itwill, of course, be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the 30 spirit of the invention or its scope as claimed.

I claim A multi-bit drill comprising a substantially cone-shaped head having a shank extending from the apex thereof, sand grooves arranged 18 in the outside walls of said head, a central socket opening through the base of the head and surroundedby a plurality of concentrically arran d sockets, the central socket being lar er t an the others, a master drill'bit a6 inserte in said central socket and pairs of chisel and bull bits mounted in the other sockets, these bits being arranged inpairs diametrically opposite each other, and locking elements arranged between said master 35 bit and the ad'acent bits.

. iirEORGE W. SCHROCK.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2689109 *Apr 30, 1948Sep 14, 1954Joy Mfg CoRock drill bit
US3075593 *Nov 18, 1959Jan 29, 1963Timken Roller Bearing CoDrill bit
US7073598Jul 23, 2003Jul 11, 2006Weatherford/Lamb, Inc.Apparatus and methods for tubular makeup interlock
US7083005May 31, 2005Aug 1, 2006Weatherford/Lamb, Inc.Apparatus and method of drilling with casing
US7090021Mar 16, 2004Aug 15, 2006Bernd-Georg PietrasApparatus for connecting tublars using a top drive
US7090023May 9, 2005Aug 15, 2006Weatherford/Lamb, Inc.Apparatus and methods for drilling with casing
US7093675Aug 1, 2001Aug 22, 2006Weatherford/Lamb, Inc.Drilling method
US7100710Dec 18, 2003Sep 5, 2006Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7108084Dec 24, 2003Sep 19, 2006Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7117957May 25, 2004Oct 10, 2006Weatherford/Lamb, Inc.Methods for drilling and lining a wellbore
US7128154Jan 29, 2004Oct 31, 2006Weatherford/Lamb, Inc.Single-direction cementing plug
US7128161Sep 20, 2005Oct 31, 2006Weatherford/Lamb, Inc.Apparatus and methods for facilitating the connection of tubulars using a top drive
US7131505 *Feb 22, 2005Nov 7, 2006Weatherford/Lamb, Inc.Drilling with concentric strings of casing
US7137454May 13, 2005Nov 21, 2006Weatherford/Lamb, Inc.Apparatus for facilitating the connection of tubulars using a top drive
US7140445Mar 5, 2004Nov 28, 2006Weatherford/Lamb, Inc.Method and apparatus for drilling with casing
US7147068Dec 5, 2003Dec 12, 2006Weatherford / Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7165634Oct 2, 2003Jan 23, 2007Weatherford/Lamb, Inc.Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7188687Jul 27, 2004Mar 13, 2007Weatherford/Lamb, Inc.Downhole filter
US7191840Mar 5, 2004Mar 20, 2007Weatherford/Lamb, Inc.Casing running and drilling system
US7213656Apr 26, 2004May 8, 2007Weatherford/Lamb, Inc.Apparatus and method for facilitating the connection of tubulars using a top drive
US7216727Dec 21, 2000May 15, 2007Weatherford/Lamb, Inc.Drilling bit for drilling while running casing
US7219744Nov 29, 2005May 22, 2007Weatherford/Lamb, Inc.Method and apparatus for connecting tubulars using a top drive
US7228901Dec 1, 2005Jun 12, 2007Weatherford/Lamb, Inc.Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7234542Feb 9, 2006Jun 26, 2007Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7264067Oct 1, 2004Sep 4, 2007Weatherford/Lamb, Inc.Method of drilling and completing multiple wellbores inside a single caisson
US7284617May 20, 2004Oct 23, 2007Weatherford/Lamb, Inc.Casing running head
US7303022Apr 27, 2004Dec 4, 2007Weatherford/Lamb, Inc.Wired casing
US7311148Feb 9, 2004Dec 25, 2007Weatherford/Lamb, Inc.Methods and apparatus for wellbore construction and completion
US7325610Mar 5, 2004Feb 5, 2008Weatherford/Lamb, Inc.Methods and apparatus for handling and drilling with tubulars or casing
US7334650Feb 2, 2004Feb 26, 2008Weatherford/Lamb, Inc.Apparatus and methods for drilling a wellbore using casing
US7360594Mar 5, 2004Apr 22, 2008Weatherford/Lamb, Inc.Drilling with casing latch
US7370707Apr 5, 2004May 13, 2008Weatherford/Lamb, Inc.Method and apparatus for handling wellbore tubulars
US7413020Mar 5, 2004Aug 19, 2008Weatherford/Lamb, Inc.Full bore lined wellbores
US7503397Jul 29, 2005Mar 17, 2009Weatherford/Lamb, Inc.Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US7509722Mar 5, 2003Mar 31, 2009Weatherford/Lamb, Inc.Positioning and spinning device
US7617866Sep 8, 2005Nov 17, 2009Weatherford/Lamb, Inc.Methods and apparatus for connecting tubulars using a top drive
US7650944Jul 11, 2003Jan 26, 2010Weatherford/Lamb, Inc.Vessel for well intervention
US7712523Mar 14, 2003May 11, 2010Weatherford/Lamb, Inc.Top drive casing system
US7730965Jan 30, 2006Jun 8, 2010Weatherford/Lamb, Inc.Retractable joint and cementing shoe for use in completing a wellbore
US7857052May 11, 2007Dec 28, 2010Weatherford/Lamb, Inc.Stage cementing methods used in casing while drilling
US7938201Feb 28, 2006May 10, 2011Weatherford/Lamb, Inc.Deep water drilling with casing
US8276689May 18, 2007Oct 2, 2012Weatherford/Lamb, Inc.Methods and apparatus for drilling with casing
USRE42877Jul 9, 2010Nov 1, 2011Weatherford/Lamb, Inc.Methods and apparatus for wellbore construction and completion
Classifications
U.S. Classification175/413, 175/420
International ClassificationE21B10/00
Cooperative ClassificationE21B10/00
European ClassificationE21B10/00