Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2338093 A
Publication typeGrant
Publication dateJan 4, 1944
Filing dateJun 28, 1941
Priority dateJun 28, 1941
Publication numberUS 2338093 A, US 2338093A, US-A-2338093, US2338093 A, US2338093A
InventorsCaldwell Walter T
Original AssigneeGeorge E Failing Supply Compan
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Kelly rod and drive bushing therefor
US 2338093 A
Images(2)
Previous page
Next page
Description  (OCR text may contain errors)

Jan. 4, 1944. w. T. CALDWELL KELLY ROD AND DRIVE BUSHING THEREFOR ATTORN EY 25h t sh t1 Patented Jan. 4,

KELLY non AND DRIVE RUSHING TnEREFoR.

- walter 'i'. Caldwell, Enid, ok1a.,assignor to 'rile George E. `Failing Supply Company, Enid, Okla.,- a corporation of Oklahoma lApplication June 28', 19471,` Serial No. 409,322

(Cl. Z55-'23) 12 Claims.

This invention relates to rotary drilling apparatus, and more particularly to a Kelly v'rod and drive bushing therefor, the application for patent for the present invention .being a continuation in part of avcopendin-g applicationl for patent on ."Kelly rodand drive bushing therefor filed January20, 1939, Serial No: 251,966, now abandoned. Y When a'- drill feeding mechanism is used in conjunction with a drill rotating mechanism it is diiiicult to grip a conventional Kelly rod with the feed chuck of the'feeding mechanism due to the cross-sectional shape thereof, and any deformity in the Kelly rod produced by the gripping chuck interferes with movement of the Kelly rod through the drive bushing. Consequently the Kelly rods are constructed to provide considerable looseness between the rods and bushings. 'I'his loosenessproduces considerable back-lash and wear due to battering caused by resistance of bit rotation under power of the rotary.

vI therefore provide a Kelly rod of circular crosssection which can be gripped by the chuck and slide freely through a circular bore in the drive bushing of the rotary mechanism and provide the bushing with relatively close fitting drive keys operable in longitudinal grooves of the Kelly rod.

I am A aware that it has been suggested to drive Kelly rods with keys, but such keys have not proved satisfactory because the keys tend to bind the kelly within the drive bushing and prevent free sliding movement of the Kelly rod through the bushing.

It is an object of the invention to overcome this diiiiculty by providing cylindrical rod-like keys which are positioned in grooves of the kelly and bushing in such amanner that driving contact area between the bushing and keys is substantially equal to the driving contact between the keys and Kelly rod with the resultant forces of the driving connection acting diametrically through the axes of the keys.

Another diihculty in rotary `drilling mechanisms is that the Kelly rod moves through the drive bushing as the drilling progresses and enters the bore-hole below the drilling table so that it is coated with drilling fluid and mud when itis retracted through the table to add another section of drill pipe. Since there is clearance space between the drive bushing and Kelly rod, the

drilling fluid and mud are barried into the bore of the drive bushing, and being of abrasive character are apt to cause rapidwear of the kelly, drive bushing, and the rod-like or cylindrical keys. A lack of adequate lubrication aggravates the wearing action.

Therefore, rfurther objects ofthe present invention are to provide the Kelly rod bushing with means for wiping the drilling fluid from the Kelly rod when the Kelly rod is moved therethrough; and to provide for pressure lubrication of the driving faces to resist wear and entrance of the drilling fluid into .the bushing.

In accomplishing these and other objectsof the invention, as hereinafter pointed out, I have provided improved detailsof structure, the preferred forms of which are illustrated in the accompanying drawings, wherein: y

Fig, 1 is a vertical section through a drill rotating mechanism equipped with a kelly and drive bushing embodying the features of the present invention.

Fig. 2 is a horizontalfsection through the drive bushing and kelly on the line 2-2 of Fig. 1.

Fig. 3 is a perspective sectional view of the Kelly drive bushing removed from its seat in the turntable of the rotary mechanism.

Fig. 4 is an enlarged horizontal section on the line 4-4 of Fig. 1, particularly illustrating the keying elements and the clearance space between the bushing and Kelly rod.

Fig. 5 is a diagrammatic View showing the drive contact areas between the Kelly rod, drive bushing and rod-like keys whereby the thrusts acting on the keys are substantially equal.

Fig. 6 is a section through a drill rotating mechanism for actuating a conventional Kelly rod of polygonal cross-section, and equipped with a modified form of drive bushing to accommodate the conventional Kelly rod.

Fig. 7 is a horizontal section through the drive bushing and kelly on the line 1-1 of Fig. 5.

Fig. 8 is a perspective sectional view of the modified form of drive bushing.

Fig. 9 is a horizontal section through the drive bushing and kelly on the line 9 9 of Fig. 8.

Referring more in detail to the drawings:

i designatesa rotary mechanism such as used in connection with conventional. drilling rigs for rotating the drilling string. The rotary mechanism includes a. turntable 2 that is mounted on, a gear `housing 3, which is adapted to be secured to the platform of the drilling rig (not shown). The rotary table 2 is preferably mounted on antifriction bearings 4 and carries a ring gear 5 meshing with a pinion gear 6. The pinion gear 6 is fixed on a drive shaft 1 that is connected with a prime mover (not shown), usually forming a part of the drilling rig. The turntable 2 has a central opening 3 forming a conical seat 9 for a drive bushing I slidably keyed relatively to a Kelly rod II which extends therethrough. The drive bushing includes a substantially conicalshaped body I2 having a tapered exterior I3 engaging the seat 9, whereby the bushing is wedged within the turntable to rotate therewith. The drive bushing also includes laterally extending lugs I4 that engage in sockets I5 formed in the turntable to provide a positive driven connection therewith. The Kelly rod Il is of circular crosssection and smaller in diameter than the bore I3 of the drive bushing to provide clearance space I3' therebetween whereby the Kelly rod is freely slidably through the drive bushing while the parts are under load incidental to rotation of the bushing and resistance'oflered by the drill bit.

The Kelly rod illustrated in Figs. 1 and 2 is formed of tubular stock to provide a channel I1 through which a drilling fluid is delivered to the drill pipe by way of a swivel head (not shown), which is attached to the upper end of the Kelly rod. 'I'he circular periphery of the Kelly rod is provided with a plurality of longitudinal grooves or flutes I8 of semicircular crosssection and shown as three in number, to engage driving keys I9 seated in registering semicircular grooves 20 formed in, the face of the bore I6. 'I'he drive members or keys are of cylinder or rod-like shape having substantially close but sliding fit within the substantially semicircular grooves,` The keys have less length than the bushing to accommodate sealing elements 2l and 22, later described, Due to the clearance space I6', and the relatively close fit of the keys, the grooves are slightly less than semicircular but they are of substantially equal depth in both the Kelly rod and bushing so that the driving contacts of the keys with the bushing and with the Kelly rod are substantially equal, as shown in Fig. 5. The axial centers of the keys therefore are in the space I3' and the driving connection between the bushing and the Kelly rod is through the diameter of the keys to equalize the pressure thereof against the walls of the respective grooves so they will not interfere with free sliding movement of the Kelly rod when under driving load. The keys have relatively close flt within the grooves so as to prevent radial play between the Kelly rod and drive bushing, thereby avoiding wear incidental to looseness. The shape of the keys permits free sliding movement of the Kelly rodthrough the bushing while they are retained therein from axial movement by means of the sealing elements now to be described. 'I'he driving pressures being equal, the keys maintain the Kelly rod concentric with the bore of the drive bushing.

Formedin the upper and lower ends of the drive bushing are counterbores 23 and 24, forming shoulders 25 and 25 substantially in registry with the ends of the keys as clearly shown in Fig. 1. Inserted within the counterbores, and engaging the shoulders, are rings 21 and 23 to engage the ends of the keys. Also inserted in the bores are packing rings 29 and 30, which are engaged by packing glands or followers 3| and 32. The rings 21 and 28 preferably have tongues 33 projecting from their inner periphery to closely engage in the grooves I8 of the Kelly rod to support similarly shaped tongues 34 of the packing rings, which also enter and seal the grooves of the kelly. The packing followers include collars 35 of suitable diameter to pass over the kelly and into the counterbores, The collars It is thus obvious that when the screws 33 are tightened, the followers 3l and 32 are moved Ainto compressing relation with the packing rings 29 and 30, and the packing rings are forced into sealing contact with the circumferential face of the Kelly rod so as to effect a seal therebetween.

The packing rings also form wipers for removing drilling fluid from vthe face and grooves of the rod before they pass into the bushing, so that the portions of the Kelly rod engaged by the inner bore of the bushing and the driving keys are free of drilling fluid. Since the drilling fluid is excluded from the bushing, it is, therefore, possible to lubricate the keys and bore of the bushing so as to further reduce wear and promote smoother driving action between the bushing and Kelly rod.

In order to supply the lubricant, the bushing III is provided with a channel 43 which extends downwardly from the upper end of the bushing and terminates substantially in the center thereof, as shown in Fig. 1. The outer end of the channel is counterbored and threaded, as at 44, to accommodate a pressure fitting 45 having a check valve 43 therein for closing the channel. It is thus obvious that by applying a pressure grease gun to the fitting, the lubricant or grease may be forced into the interior of the bushing and retained by the packings underpressure. Therefore the clearance space I6' between the kelly and drive bushing, as well as those surrounding the driving keys, is filled with lubricant under sufficient pressure to exclude further the possibility of drilling fluid entering the driving portion of the bushing. If desired, the washers 21 and 23 may be retained against the shoulders 25 and 23 by means of spring rings 41 engaged within grooves 43 in the walls of the bores and having portions projecting over the washers.

The drive bushing 49, illustrated in Figs. 6

to 9 inclusive, is substantially the same construction as that shown in Figs. 1, 2 and 3, with the exception that it is provided with a polygonal bore 50 and is equipped with similar packing elements 43, 5I and 52 at the respective ends thereof. The packing rings, however, conform in shape to the cross-sectional shape of the Kelly rod 53, the illustrated instance being a Kelly rod of hexagonal section. However, it is obvious .that a similar bushing may be provided for any conventional shaped Kelly rod vsi'ithout departing from the spirit of the invent on.

From the foregoing it is obvious that I have provided a Kelly rod and drive bushing assembly constructed to provide free sliding movement of the Kelly rod in the bushing, and have provided means to exclude the drilling fluid from the driving connection. I have also provided the bushing with a lubricant supply so that closer tolerances may be effected between the driving faces of the bushing and Kelly rod.

What I claim and desire to secure by Letters Patent is:

l. In a drill rotating mechanism, a Kelly rod of circular cross-section and having longitudinal grooves of substantially semicircular cross-section, a driving bushing having a cylindrical bore of slightly larger diameter than the diameter of the Kelly rod to provide a clearance space therebetween iorfree sliding movement `of the Kelly rod vthrough the bushing, said bushing having groovesv of substantially vsemioircular cross-section registering with the grooves-in the Kelly rod and cooperating therewith to provide recesses of circular cross-section, cylindrical keys closely fitting within said. recesses vand having driven contact with 'the `bushing substantially equal in area tov driving contact with theKelly rod, and means at the ends of the bushing engagingly retaining said cylindrical keys to prevent longitudinal movement of the keys in the bushing.r i

2. In a` drill rotating mechanism, a Kelly rod of circular cross-section and having longitudinal grooves of substantially semioircular cross-section, a driving bushing having a cylindrical bore of slightly larger diameter than the diameter oi.' the Kelly rod to provide a clearance space therebetween for free sliding movement of the Kelly rod through the bushing, said bushing having grooves of substantially semicircular cross-section registering with the grooves in the Kelly lrod and cooperating therewith to provide recesses of circular cross-section, cylindrical keys closely fitting within said recesses and having driven contact with the.bushing substantially equal in area to driving contact with the Kelly rod, said driving and driven contact areas being located on diametrically opposite sides oi said keys, and means at the ends of the bushing engagingly retaining said cylindrical keys to prevent longitudinal movement of the keys in the bushing.

3. In a drill rotating mechanism, a Kelly rod,l of circular cross-section and having longitudinal grooves of substantially semioircular cross-section, a driving bushing having a cylindrical bore of slightly larger diameter than the diameter of the Kelly rod to provide a clearance space therebetween for free sliding movement of the Kelly rod through the bushing, said bushing having grooves of substantially semicii'cular cross-section registering with the grooves in the Kelly rod and cooperating therewith to provide recesses of circular cross-section, cylindrical keys closely iitting within said recesses and having driven contact with the bushing substantially equal in area to driving contact with the Kelly rod, and sealing means at the respective ends of the bushing to retain said cylindrical keys.

4. In a drill rotating mechanism, a Kelly rod of circular cross-section and having longitudinal grooves of substantially semicircular crosssection, a driving bushing having a cylindrical bore of slightly larger diameter than the diameter of the Kelly rod to provide a clearance space therebetween for free sliding movement of the Kelly rod through the bushing, said bushing having grooves of substantially semioircular cross-section registering with the grooves in the Kelly rod and cooperating therewith to provide recesses of circular cross-section, cylindrical keys closely fitting within said recesses and having driven contact with the bushing substantially equal in area to driving contact with the Kelly rod, said driving and driven contact areas being located on diametrically opposite sides of said keys, means at the ends of the bushing engagingly retaining said cylindrical keys to prevent longitudinal movement of the keys in the bushing, sealing means at the respective ends of the bushing to retain said cylindrical keys, and

" assaooa means' connected with the Bushingmfof meeting a lubricant between said sealing means to 1111 4 the clearance space and provide lubricantfor the cylindrical keys. r I

5, In a drill rotating mechanism, a Kellyrod of circular cross-,section and having longitudl` nal grooves of substantially semicylindrical crosssection, a drive `bushing yfor theKelly rod having a bore passing the Kelly rod therethrough and provided with grooves registering with the Kelly rod grooves and of substantially semicylindcal cross-section, driving keys in said registering grooves of substantially cylindrical cross-section, and packing means at the respective ends of said bore to seal the bushing with the Kelly rod including means for retaining said keys from longitudinal movement in the grooves of the drive bushing.

6. In a drill rotating mechanism. a Kelly rod i of circular cross-section and having longitudinal grooves of substantially semicylindrical crosssection, a drive bushing for the Kelly rod having a bore passing the Kelly rod therethrough and provided with grooves registering with the Kelly rod grooves and of substantially semicylindrical cross-section, driving keys in said registering grooves of substantially cylindrical cross-section, packing means at the respective ends of said bore to seal the bushing with the Kelly rod including means for retaining said keys from longitudinal movement in the grooves of the drive bushing, and means connected with the drive bushing for injecting a lubricant between said packing means for lubricating the keys in said grooves.

7. In a drill rotating mechanism, a Kelly rod having longitudinal grooves, a drive bushing having a bore passing the Kelly rod therethrough and provided with grooves registering with the Kelly rod grooves, driving keys in said grooves, and packing means at the respective ends of said bore to seal the bushing with the Kelly rod including means for retaining said keys from longitudinal movement in the grooves of the drive bushing.

8. In a drill rotating mechanism, a Kelly rod having longitudinal grooves, a drive bushing having a bore passing the Kelly rod therethrough and provided with grooves registering with the Kelly rod grooves, driving keys in said grooves, packing means atthe respective ends of said bore to seal the bushing with the Kelly rod including means for retaining said keys from longitudinal movement in the grooves of the drive bushing, and means for injecting a pressure medium into the bore of the drive bushing.

9. In a drill rotating mechanism, a Kelly rod having longitudinal grooves, a drive bushing having a bore passing the Kelly rod therethrough and provided with grooves registering with the Kelly rod grooves, driving keys in said grooves, said bushing having counterbores at the upper and lower ends thereof, and packing means in said counterbores to seal the bushing with the Kelly rod including means for 'retaining said keys from longitudinal movement in the grooves of the drive bushing.

10. In a drill rotating mechanism, a Kelly rod having longitudinal grooves, a drive bushing having a bore passing the Kelly rod therethrough and provided with grooves registering with the Kelly rod grooves, driving keys in said grooves, said bushing having counterbores at the upper and lower ends thereof, washers in the bottoms of said bores and having tongues extending into said Kelly rod grooves, packing supported by said washers and having flexible tongues supported on said tongues of the washers, and glands for retaining said packing.

11. In a drill rotating mechanism, a Kelly rod having longitudinal grooves, a drive bushing having a bore passing the Kelly rod therethrough and provided with grooves registering with the Kelly rod grooves, driving keys in said grooves, said bushing having counterbores at the upper and lower ends thereof, washers in the bottoms of said bores and having tongues extending into said Kelly rod grooves, packing supportedby said washers and having flexible tongues supported on said tongues oir the washers, and glands for retaining said t packing, said glands having tongues extending into the Kelly rod grooves to cooperate with the washer tongues in supporting the packing in sealing contact with said grooves. 12.` In a drill rotating mechanism, a Kelly rod having longitudinal grooves, a drive bushing having a bore passing the Kellyrod therethrough and provided with grooves registering with the Kelly rod grooves, driving keys in said grooves, said bushinghaving counterbores at the upper and lower ends thereof, washers in the bottoms of said bqres and having tongues extending into said Kelly rod grooves, packing supported by said washers and having flexible tongues supported on said tongues of the washers, glands for retaining said packing, and means for retaining said washers in the bottoms of said bores.

WALTER T. CALDWELL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2628817 *Jan 24, 1950Feb 17, 1953Union Carbide & Carbon CorpRock piercing blowpipe
US2739790 *Sep 29, 1948Mar 27, 1956Joy Mfg CoRotary oil well drilling apparatus
US2745636 *Mar 9, 1953May 15, 1956Exxon Research Engineering CoKelly drive bushing
US2784942 *Jan 11, 1955Mar 12, 1957California Research CorpApparatus for simultaneously drilling and casing shot holes
US2927774 *May 10, 1957Mar 8, 1960Phillips Petroleum CoRotary seal
US2979926 *Dec 23, 1957Apr 18, 1961Joy Mfg CoSplit kelly driver
US2987129 *Mar 26, 1959Jun 6, 1961Houston Engineers IncFluid pressure one way jar
US2992548 *Aug 5, 1959Jul 18, 1961Jean Walterscheid MaschinenfabUniversal-joint shaft assembly
US3112627 *Nov 7, 1960Dec 3, 1963Leitz Ernst GmbhCylindrical mount for photographic objectives
US3197216 *Jul 31, 1962Jul 27, 1965Homer E JacksonAlignment control and seal for spline drives
US3446105 *Jan 24, 1967May 27, 1969Houdaille Industries IncNotching unit
US3797584 *Mar 31, 1972Mar 19, 1974E BaileyStriking bar
US3874196 *Jul 16, 1973Apr 1, 1975Gardner Denver CoRotary drive and joint breakout mechanism
US3920087 *Jan 22, 1975Nov 18, 1975Gardner Denver CoRotary drive and joint breakout mechanism
US4172391 *Sep 9, 1977Oct 30, 1979The United States Of America As Represented By The United States Department Of EnergyDrill drive mechanism
US4325233 *Dec 13, 1979Apr 20, 1982Joy Manufacturing CompanyKelly and kelly drive bushing
US4493245 *Apr 22, 1983Jan 15, 1985Rimrock CorporationRotary and linear actuating device
US5647444 *Aug 23, 1996Jul 15, 1997Williams; John R.Rotating blowout preventor
US5662181 *Oct 22, 1996Sep 2, 1997Williams; John R.Rotating blowout preventer
US6138774 *Mar 2, 1998Oct 31, 2000Weatherford Holding U.S., Inc.Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment
US6263982Mar 2, 1999Jul 24, 2001Weatherford Holding U.S., Inc.Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US6470975Mar 1, 2000Oct 29, 2002Weatherford/Lamb, Inc.Internal riser rotating control head
US6913092Jul 23, 2001Jul 5, 2005Weatherford/Lamb, Inc.Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US7159669Oct 28, 2002Jan 9, 2007Weatherford/Lamb, Inc.Internal riser rotating control head
US7237623Sep 19, 2003Jul 3, 2007Weatherford/Lamb, Inc.Method for pressurized mud cap and reverse circulation drilling from a floating drilling rig using a sealed marine riser
US7258171Nov 21, 2005Aug 21, 2007Weatherford/Lamb, Inc.Internal riser rotating control head
US7448454Mar 23, 2004Nov 11, 2008Weatherford/Lamb, Inc.Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
US7487837Nov 23, 2004Feb 10, 2009Weatherford/Lamb, Inc.Riser rotating control device
US7559359Feb 7, 2008Jul 14, 2009Williams John RSpring preloaded bearing assembly and well drilling equipment comprising same
US7635034Feb 7, 2008Dec 22, 2009Theresa J. Williams, legal representativeSpring load seal assembly and well drilling equipment comprising same
US7708089Apr 15, 2008May 4, 2010Theresa J. Williams, legal representativeBreech lock stripper rubber pot mounting structure and well drilling equipment comprising same
US7717169Feb 7, 2008May 18, 2010Theresa J. Williams, legal representativeBearing assembly system with integral lubricant distribution and well drilling equipment comprising same
US7717170Feb 7, 2008May 18, 2010Williams John RStripper rubber pot mounting structure and well drilling equipment comprising same
US7726416Feb 7, 2008Jun 1, 2010Theresa J. Williams, legal representativeBearing assembly retaining apparatus and well drilling equipment comprising same
US7762320Feb 7, 2008Jul 27, 2010Williams John RHeat exchanger system and method of use thereof and well drilling equipment comprising same
US7766100Feb 7, 2008Aug 3, 2010Theresa J. Williams, legal representativeTapered surface bearing assembly and well drilling equiment comprising same
US7789172Apr 15, 2008Sep 7, 2010Williams John RTapered bearing assembly cover plate and well drilling equipment comprising same
US7798250Feb 7, 2008Sep 21, 2010Theresa J. Williams, legal representativeBearing assembly inner barrel and well drilling equipment comprising same
US7836946Mar 2, 2006Nov 23, 2010Weatherford/Lamb, Inc.Rotating control head radial seal protection and leak detection systems
US7926593Mar 31, 2008Apr 19, 2011Weatherford/Lamb, Inc.Rotating control device docking station
US7934545Oct 22, 2010May 3, 2011Weatherford/Lamb, Inc.Rotating control head leak detection systems
US7997345Oct 19, 2007Aug 16, 2011Weatherford/Lamb, Inc.Universal marine diverter converter
US8113291Mar 25, 2011Feb 14, 2012Weatherford/Lamb, Inc.Leak detection method for a rotating control head bearing assembly and its latch assembly using a comparator
US8286734Oct 23, 2007Oct 16, 2012Weatherford/Lamb, Inc.Low profile rotating control device
US8322432Dec 21, 2009Dec 4, 2012Weatherford/Lamb, Inc.Subsea internal riser rotating control device system and method
US8347982Apr 16, 2010Jan 8, 2013Weatherford/Lamb, Inc.System and method for managing heave pressure from a floating rig
US8347983Jul 31, 2009Jan 8, 2013Weatherford/Lamb, Inc.Drilling with a high pressure rotating control device
US8353337Feb 8, 2012Jan 15, 2013Weatherford/Lamb, Inc.Method for cooling a rotating control head
US8408297Mar 15, 2011Apr 2, 2013Weatherford/Lamb, Inc.Remote operation of an oilfield device
US8636087Jan 7, 2013Jan 28, 2014Weatherford/Lamb, Inc.Rotating control system and method for providing a differential pressure
US8701796Mar 15, 2013Apr 22, 2014Weatherford/Lamb, Inc.System for drilling a borehole
US8714240Jan 14, 2013May 6, 2014Weatherford/Lamb, Inc.Method for cooling a rotating control device
Classifications
U.S. Classification464/7, 464/165
International ClassificationE21B3/04, F16H1/14, E21B3/00, F16H1/04
Cooperative ClassificationE21B3/04, F16H1/14
European ClassificationE21B3/04