US3096103A - Dual passage rotary swivel - Google Patents

Dual passage rotary swivel Download PDF

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Publication number
US3096103A
US3096103A US846173A US84617359A US3096103A US 3096103 A US3096103 A US 3096103A US 846173 A US846173 A US 846173A US 84617359 A US84617359 A US 84617359A US 3096103 A US3096103 A US 3096103A
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tube
rotary
shank
passage
swivel
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US846173A
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Demery A Murphy
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Armco Inc
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Armco Inc
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/02—Swivel joints in hose-lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
    • F16L39/04—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies allowing adjustment or movement

Definitions

  • This invention relates to rotary swivels of the type used in the drilling of wells and it is particularly directed to improvements which provide a plurality of concentric passages for carrying fluids through the swivel.
  • Conventional swivels used in the process of drilling wells by the hydraulic rotary method have a single central passage for carrying mud fluid through the swivel and into the upper end of the drill string which the swivel supports.
  • This mud fluid passes through the interior of the drill pipe and emerges through openings in the bit.
  • This mud fluid serves to carry cuttings from the bit upward from the bottom of the hole and back to the surface.
  • one form of drilling technique uses a column of air moving at high velocity, instead of drilling mud, for removing cuttings from the bit.
  • a technique is disclosed in the Grable Patent No. 2,657,016.
  • the return flow of air carrying the cuttings continue to move at high velocity, and therefore it is desirable to have this return flow occur within the drill string itself. Accordingly, both the drill string and the swivel must be provided with dual passages, one for air travelling down to the bit and one for air returning the cuttings from the bit.
  • FIGURE 1 is a front elevation showing a preferred embodiment of my invention.
  • FIGURE 2A is a sectional elevation taken substanially on the lines 2-2 as shown in FIGURE 1, representing the upper portion thereof.
  • FIGURE 23 is a sectional elevation taken substantially on the lines 22 as shown in FIGURE 1, representing the lower portion thereof.
  • FIGURE 23 is a continuation of the lower end of FIGURE 2A.
  • FIGURE 3 is a transverse sectional view taken substantially on the lines 3-3 as shown in FlGURE 2A.
  • FIGURE 4 is a transverse sectional view taken substantially on the lines 4-4 as shown in FIGURE 23.
  • FIGURE 5 and FIGURE 6 are transverse sectional views taken substantially on the lines 55 and 66 respectively as shown in FIGURE 23.
  • the swivel generally designated It ⁇ includes a non-rotary housing 11 pendantly suspended by means of a bail 12 in a conventional manner.
  • a load carrying shank 13 is mounted on a main bearing assembly 14- Within the housing and projects through the lower end of the housing.
  • a sub 15 connects the lower end of the shank 13 to the upper end of the kelly 16.
  • a bonnet 17 is provided with a lower flange 18 which closes the upper end of the housing '11. Threaded fastenings 19 hold the bonnet 17 in place on the housing 11.
  • An elevated support ring 2% is integrally formed on the bonnet 17 and curved walls 21 connect a suppoit ring to the flange 18. Apertures .22 are provided the walls 21.
  • the housing 11 contains a radial bearing 23, the upthrust bearing 23a and sealing means 24 for retaining lubn'cant within the housing.
  • Another radial bearing 25 maybe mounted on the lower end of the skirt 26 extending downward from the flange 1 8.
  • the rotary shank 13 projects upward through the upper sealing assembly 27.
  • the rotary shank 13 is provided with a central axial opening 2 8 and a rotary tube 29 is mounted concentrically within this opening, thereby defining a first passage 39 in the annular space between the tube 29 and the rotary shank 13, and a second passage 31 within the tube 29.
  • An apertured ring 32 is fixed on the outer surface of the tube .29 and has a peripheral portion 33 which is clamped between the rotary shank 13 and the upper end of the sub 15.
  • the ports 34 in the ring 32 form a part of the first passage 30.
  • An axially extending key 35 prevents relative rotation between the ring 32, and the tube 29, and accordingly the tube 29 turns as a unit with the rotary shank 13.
  • a snap ring 3 6 received in a groove on the tube 29 may be provided to anchor the ring 32 in place on the tube 2?.
  • the lower end of tube 29 is slidably received within the collar 37 and the upper end of the tube 29 projects through the tubular wash pipe 38 which is connected to rotate with the tubular shank 13 and which forms a continuation of the first pasage 30.
  • the lower end of the wash pipe 38 is connected to rotary shank 13 by means of the spline ring '39 and the clamp nut 40. This construction is described in detail in my prior Patent No. 2,764,428 granted September 25, 1956.
  • This clamping nut do is connected by threads 41 to the upper end of the rotary shank 13.
  • a tubular sleeve 42 is clamped to the non-rotary support ring 2% by means of the bolts 43 and the lower end of this sleeve 42 is provided with the bore 44 which receives a packing assembly 45 engaging the upper portion of the outer surface of the wash pipe 38.
  • a nut 46 on the lower end of the sleeve 42 holds the packing assembly 45 in place.
  • a flow conduit 4-7 is threadedly connected to the lateral port 48 in the sleeve 42 and communicates with the interior of the wash pipe 38 and the passage 30.
  • a valve 49 of conventional design is provided on the flow conduit 47, and a bracing strut 56* may be provided for the flow conduit 4-7, if desired.
  • a second wash pipe 51 is provided, and is connected to the upper end of the tube 29 by means of the threads 52.
  • a packing assembly 53 is provided in a bore 54 in the sleeve 42 and provides a seal against the outer cylindrical surface of the rotating wash pipe 51.
  • This paching assembly 53 provides a rotary seal to prevent leakage between the first passage 3% ⁇ and the second passage 3 1.
  • the packing assembly 53 is held in place in the bore 54 by means of the ring 55 which is clamped in place by the flange 56 engaged by the bolts 48.
  • This flange 56 is formed integrally with the threaded projection 57 and the latter is connected by means of the union 58 with the flow conduit 5?.
  • Suitable bracing struts on may be provided for the conduit 59, if desired.
  • a conventional valve 61 controls flow through the conduit 59.
  • the collar 37 which slidably receives the lower end of the tube 29 is fixed on the upper end of the tube 65 positioned concentrically within the kelly 16.
  • Radial fins 66 projecting outward from the tube as rests on 'an inclined shoulder 67 provided in the upper end of the kelly 16. These fins 6n support and center the tube 65 within the bore 68 of the kelly.
  • the annular space between the tube 65 and the kelly bore 68 forms part of the passage 30 while the interior of the tube 65 forms a part of the passage 31. Additional means are provided for centering the tube 55 the kelly 16' and as shown in the drawings this means includes a plurality of soratoher devices generally designated 69.
  • scratcher devices may be of any conventional style, for example as shown in the Wright Patent 2,506,405.
  • the scratchers 69 are welded to the tube 65. They are not employed for their usual scratching function; they are used only to hold the tube 65 in central position within the kelly bore 68.
  • the kelly'16 is turned in the usual manner by means of a rotary machine and drive bushing (not shown) engaging the non-eircular periphery 7G.
  • the kelly drives the sub 15 through the threaded connection 71 and the sub 15 drives the rotary shank 13 of the swivel 19 through the threaded connection 72.
  • the ring 32 drives the tube 29.
  • Air under pressure is delivered to the condui-t 47 through the valve 49 and this air passes through the interior of the wash pipe 38 into the annular passage 3%.
  • the air passes downward through the passage 39 through the rotary shank 13' of the swivel, and through the sub 15, kelly 16"and down through the drill string to the bit (not shown).
  • Air returning from the bit passes upward through the inner passage 31 through the tube 65 and tube 29.
  • the rapidly moving stream of air carrying cuttings passes upward through the wash pipe 51 and into the conduit 59 and out through valve 61.
  • the conduits 47 and 59 and their associated bracing struts are removed.
  • the bolts 43 are then removed to permit disassenrbiy of the flange 56.
  • the sleeve 42 may then be moved upward through the central opening in the support ring 20.
  • the wash pipes '38 and 51 may be replaced if desired in the absence of the sleeve 42.
  • the sleeve 42 may be returned to position and the pants reassembled.
  • a housing bearing means with in the housing, a shank mounted on said bearing means and projecting through the lower end of the housing, the shank having a central opening extending therethrough, a tube extending centrally through the shank opening and defining a first passage in the annulus between the shank and the tube and a second passage within the tube, a sub threadedly secured to :the lower end of said shank, means connecting the tube and the shank so that they rd tate as a unit, said means including an element fixed to said tube and having a port-ion thereof clamped between the shank and said sub, a first Washpipe detachably conhected to the upper end of said shank and encircling a portion of said tube, a second washpipe detachably connected to the upper end of said tube, a sleeve detachably secured relativeto said housing and having axially spaced sealing means engaging said wash

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)

Description

July 2, 1963 D. A. MURPHY 3,096,103
DUAL PASSAGE ROTARY SWIVEL Filed Oct. 15, 1959 3 Sheets-Sheet 1 Jim-ma:
OEMEQY A Mae A/y INVENTOR.
BY i v m 47700A/EY5 July 2, 1963 MURPHY I 3,096,103
DUAL PASSAG OEM EQY A. Mae/ 14V INVENTOR.
A 77'02/V5YS $396,103 DUAL PAESAGE RQTARY SWIVEL Demery A. Murphy, Torrance, Caiiil, assignor, by mesne assignments, to Arman Steel Corporation, Middletown, Ohio, a corporation of Ghio Filed Oct. 13, 1959, Ser. No. 846,173 1 Claim. (6i. 285134) This invention relates to rotary swivels of the type used in the drilling of wells and it is particularly directed to improvements which provide a plurality of concentric passages for carrying fluids through the swivel.
Conventional swivels used in the process of drilling wells by the hydraulic rotary method have a single central passage for carrying mud fluid through the swivel and into the upper end of the drill string which the swivel supports. This mud fluid passes through the interior of the drill pipe and emerges through openings in the bit. This mud fluid serves to carry cuttings from the bit upward from the bottom of the hole and back to the surface.
In certain types of rotary drilling techniques using a rotary drill string supported by a rotary swivel, it is desirable to have more than one passage extending through the swivel and drill string to the bit. As an illustrative example, one form of drilling technique uses a column of air moving at high velocity, instead of drilling mud, for removing cuttings from the bit. Such a technique is disclosed in the Grable Patent No. 2,657,016. In this latter system using air, it is desirable that the return flow of air carrying the cuttings continue to move at high velocity, and therefore it is desirable to have this return flow occur within the drill string itself. Accordingly, both the drill string and the swivel must be provided with dual passages, one for air travelling down to the bit and one for air returning the cuttings from the bit.
Accordingly, it is the principal object of this invention to provide a novel :form of rotary swivel having a plurality of passages extending therethrough. Another object is to provide a device of this type having dual concentric passages. A more particular object is to provide a dual passage rotary swivel having novel means for connecting each of a pair of conduits to one of the concentric passages, respectively.
Other and more detailed objects and advantages will appear hereinafter.
In the drawings:
FIGURE 1 is a front elevation showing a preferred embodiment of my invention.
FIGURE 2A is a sectional elevation taken substanially on the lines 2-2 as shown in FIGURE 1, representing the upper portion thereof. FIGURE 23 is a sectional elevation taken substantially on the lines 22 as shown in FIGURE 1, representing the lower portion thereof. FIGURE 23 is a continuation of the lower end of FIGURE 2A.
FIGURE 3 is a transverse sectional view taken substantially on the lines 3-3 as shown in FlGURE 2A.
FIGURE 4 is a transverse sectional view taken substantially on the lines 4-4 as shown in FIGURE 23.
FIGURE 5 and FIGURE 6 are transverse sectional views taken substantially on the lines 55 and 66 respectively as shown in FIGURE 23.
Referring to the drawings, the swivel generally designated It} includes a non-rotary housing 11 pendantly suspended by means of a bail 12 in a conventional manner. A load carrying shank 13 is mounted on a main bearing assembly 14- Within the housing and projects through the lower end of the housing. A sub 15 connects the lower end of the shank 13 to the upper end of the kelly 16.
A bonnet 17 is provided with a lower flange 18 which closes the upper end of the housing '11. Threaded fastenings 19 hold the bonnet 17 in place on the housing 11. An elevated support ring 2% is integrally formed on the bonnet 17 and curved walls 21 connect a suppoit ring to the flange 18. Apertures .22 are provided the walls 21.
In addition to the main bearing assembly 14, the housing 11 contains a radial bearing 23, the upthrust bearing 23a and sealing means 24 for retaining lubn'cant within the housing. Another radial bearing 25 maybe mounted on the lower end of the skirt 26 extending downward from the flange 1 8. The rotary shank 13 projects upward through the upper sealing assembly 27.
The rotary shank 13 is provided with a central axial opening 2 8 and a rotary tube 29 is mounted concentrically within this opening, thereby defining a first passage 39 in the annular space between the tube 29 and the rotary shank 13, and a second passage 31 within the tube 29. An apertured ring 32 is fixed on the outer surface of the tube .29 and has a peripheral portion 33 which is clamped between the rotary shank 13 and the upper end of the sub 15. The ports 34 in the ring 32 form a part of the first passage 30. An axially extending key 35 prevents relative rotation between the ring 32, and the tube 29, and accordingly the tube 29 turns as a unit with the rotary shank 13. A snap ring 3 6 received in a groove on the tube 29 may be provided to anchor the ring 32 in place on the tube 2?.
The lower end of tube 29 is slidably received within the collar 37 and the upper end of the tube 29 projects through the tubular wash pipe 38 which is connected to rotate with the tubular shank 13 and which forms a continuation of the first pasage 30. The lower end of the wash pipe 38 is connected to rotary shank 13 by means of the spline ring '39 and the clamp nut 40. This construction is described in detail in my prior Patent No. 2,764,428 granted September 25, 1956. This clamping nut do is connected by threads 41 to the upper end of the rotary shank 13.
A tubular sleeve 42 is clamped to the non-rotary support ring 2% by means of the bolts 43 and the lower end of this sleeve 42 is provided with the bore 44 which receives a packing assembly 45 engaging the upper portion of the outer surface of the wash pipe 38. A nut 46 on the lower end of the sleeve 42 holds the packing assembly 45 in place. A flow conduit 4-7 is threadedly connected to the lateral port 48 in the sleeve 42 and communicates with the interior of the wash pipe 38 and the passage 30. A valve 49 of conventional design is provided on the flow conduit 47, and a bracing strut 56* may be provided for the flow conduit 4-7, if desired.
A second wash pipe 51 is provided, and is connected to the upper end of the tube 29 by means of the threads 52. A packing assembly 53 is provided in a bore 54 in the sleeve 42 and provides a seal against the outer cylindrical surface of the rotating wash pipe 51. This paching assembly 53 provides a rotary seal to prevent leakage between the first passage 3%} and the second passage 3 1. The packing assembly 53 is held in place in the bore 54 by means of the ring 55 which is clamped in place by the flange 56 engaged by the bolts 48. This flange 56 is formed integrally with the threaded projection 57 and the latter is connected by means of the union 58 with the flow conduit 5?. Suitable bracing struts on may be provided for the conduit 59, if desired. A conventional valve 61 controls flow through the conduit 59.
The collar 37 which slidably receives the lower end of the tube 29 is fixed on the upper end of the tube 65 positioned concentrically within the kelly 16. Radial fins 66 projecting outward from the tube as rests on 'an inclined shoulder 67 provided in the upper end of the kelly 16. These fins 6n support and center the tube 65 within the bore 68 of the kelly. The annular space between the tube 65 and the kelly bore 68 forms part of the passage 30 while the interior of the tube 65 forms a part of the passage 31. Additional means are provided for centering the tube 55 the kelly 16' and as shown in the drawings this means includes a plurality of soratoher devices generally designated 69. These scratcher devices may be of any conventional style, for example as shown in the Wright Patent 2,506,405.. The scratchers 69 are welded to the tube 65. They are not employed for their usual scratching function; they are used only to hold the tube 65 in central position within the kelly bore 68.
In operation, the kelly'16 is turned in the usual manner by means of a rotary machine and drive bushing (not shown) engaging the non-eircular periphery 7G. The kelly drives the sub 15 through the threaded connection 71 and the sub 15 drives the rotary shank 13 of the swivel 19 through the threaded connection 72. The ring 32 drives the tube 29. Air under pressure is delivered to the condui-t 47 through the valve 49 and this air passes through the interior of the wash pipe 38 into the annular passage 3%. The air passes downward through the passage 39 through the rotary shank 13' of the swivel, and through the sub 15, kelly 16"and down through the drill string to the bit (not shown). Air returning from the bit passes upward through the inner passage 31 through the tube 65 and tube 29. The rapidly moving stream of air carrying cuttings passes upward through the wash pipe 51 and into the conduit 59 and out through valve 61.
When it is desired to change one or both of the packing assemblies 45 and 53, the conduits 47 and 59 and their associated bracing struts are removed. The bolts 43 are then removed to permit disassenrbiy of the flange 56. The sleeve 42 may then be moved upward through the central opening in the support ring 20. The wash pipes '38 and 51 may be replaced if desired in the absence of the sleeve 42. After new wash pipes and packing msernblies have been installed the sleeve 42 may be returned to position and the pants reassembled.
Having fully described my invention it is to be understood that I do not wish to be limited to the details set forth above, but my invention is of the full scope of the appended claim.
I claim:
In a rotary swivel of the type used in the drilling of wells, the combination of: a housing, bearing means with in the housing, a shank mounted on said bearing means and projecting through the lower end of the housing, the shank having a central opening extending therethrough, a tube extending centrally through the shank opening and defining a first passage in the annulus between the shank and the tube and a second passage within the tube, a sub threadedly secured to :the lower end of said shank, means connecting the tube and the shank so that they rd tate as a unit, said means including an element fixed to said tube and having a port-ion thereof clamped between the shank and said sub, a first Washpipe detachably conhected to the upper end of said shank and encircling a portion of said tube, a second washpipe detachably connected to the upper end of said tube, a sleeve detachably secured relativeto said housing and having axially spaced sealing means engaging said washpip-es, a flow conduit connected to said sleeve at a location between said sealing means and communicating with said first passage, and a second flow conduit fixed with respect to said housing and communicating with said second passage.
References Cited the file of this patent UNITED STATES PATENTS Failing Aug. 26, 1958
US846173A 1959-10-13 1959-10-13 Dual passage rotary swivel Expired - Lifetime US3096103A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3297100A (en) * 1964-04-13 1967-01-10 Large Mine Shaft Drillers Inc Dual drill stem method and apparatus
US3310107A (en) * 1963-10-23 1967-03-21 Fmc Corp Underwater well method and apparatus
US3529626A (en) * 1968-05-31 1970-09-22 Aro Corp Recirculating hose assembly
US3601206A (en) * 1969-09-15 1971-08-24 King Oil Tools Side inlet swivel
US3664441A (en) * 1970-06-01 1972-05-23 Carey Machine And Supply Co Concentric pipe drill string
US3684316A (en) * 1970-09-18 1972-08-15 Sherritt Gordon Mines Ltd Rotary joint
US3794126A (en) * 1971-09-01 1974-02-26 Smith International Drilling and belling apparatus
US3807514A (en) * 1972-08-10 1974-04-30 J Murrell Drilling apparatus
US3830319A (en) * 1972-05-16 1974-08-20 Stork Conrad Bv Drilling apparatus
US3871486A (en) * 1973-08-29 1975-03-18 Bakerdrill Inc Continuous coring system and apparatus
US4359115A (en) * 1979-03-08 1982-11-16 Construction De Materiels De Mines S.A. Novel rotary drill bits and drilling process
DE3418892A1 (en) * 1984-05-21 1985-11-21 Preussag AG Berlin-Hannover, 3000 Hannover THREADED OR CONNECTOR
US5435607A (en) * 1993-09-07 1995-07-25 S. E. Huffman Corporation Rotary coupler

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2120132A (en) * 1936-12-23 1938-06-07 Texas Co Method and apparatus for cleaning wells
US2234454A (en) * 1940-05-20 1941-03-11 Herman F Richter Apparatus for drilling wells
US2459472A (en) * 1945-03-23 1949-01-18 Emsco Derrick & Equip Co Rotary swivel
US2657016A (en) * 1950-01-20 1953-10-27 Donovan B Grable Fluid circulation head for drill strings
US2849213A (en) * 1953-11-12 1958-08-26 George E Failing Company Apparatus for circulating drilling fluid in rotary drilling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2120132A (en) * 1936-12-23 1938-06-07 Texas Co Method and apparatus for cleaning wells
US2234454A (en) * 1940-05-20 1941-03-11 Herman F Richter Apparatus for drilling wells
US2459472A (en) * 1945-03-23 1949-01-18 Emsco Derrick & Equip Co Rotary swivel
US2657016A (en) * 1950-01-20 1953-10-27 Donovan B Grable Fluid circulation head for drill strings
US2849213A (en) * 1953-11-12 1958-08-26 George E Failing Company Apparatus for circulating drilling fluid in rotary drilling

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310107A (en) * 1963-10-23 1967-03-21 Fmc Corp Underwater well method and apparatus
US3297100A (en) * 1964-04-13 1967-01-10 Large Mine Shaft Drillers Inc Dual drill stem method and apparatus
US3529626A (en) * 1968-05-31 1970-09-22 Aro Corp Recirculating hose assembly
US3601206A (en) * 1969-09-15 1971-08-24 King Oil Tools Side inlet swivel
US3664441A (en) * 1970-06-01 1972-05-23 Carey Machine And Supply Co Concentric pipe drill string
US3684316A (en) * 1970-09-18 1972-08-15 Sherritt Gordon Mines Ltd Rotary joint
US3794126A (en) * 1971-09-01 1974-02-26 Smith International Drilling and belling apparatus
US3830319A (en) * 1972-05-16 1974-08-20 Stork Conrad Bv Drilling apparatus
US3807514A (en) * 1972-08-10 1974-04-30 J Murrell Drilling apparatus
US3871486A (en) * 1973-08-29 1975-03-18 Bakerdrill Inc Continuous coring system and apparatus
US3948588A (en) * 1973-08-29 1976-04-06 Bakerdrill, Inc. Swivel for core drilling
US4359115A (en) * 1979-03-08 1982-11-16 Construction De Materiels De Mines S.A. Novel rotary drill bits and drilling process
DE3418892A1 (en) * 1984-05-21 1985-11-21 Preussag AG Berlin-Hannover, 3000 Hannover THREADED OR CONNECTOR
US5435607A (en) * 1993-09-07 1995-07-25 S. E. Huffman Corporation Rotary coupler

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