US3263446A - Shock isolator for rotary drill string - Google Patents

Shock isolator for rotary drill string Download PDF

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US3263446A
US3263446A US303327A US30332763A US3263446A US 3263446 A US3263446 A US 3263446A US 303327 A US303327 A US 303327A US 30332763 A US30332763 A US 30332763A US 3263446 A US3263446 A US 3263446A
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drill string
convolutions
bellows
shock
bit
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US303327A
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Jr John H Wiggins
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ExxonMobil Upstream Research Co
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Exxon Production Research Co
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    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/72—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling parts
    • F16D3/74—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling parts the intermediate member or members being made of rubber or other rubber-like flexible material
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E21B17/073—Telescoping joints for varying drill string lengths; Shock absorbers with axial rotation

Definitions

  • This invention relates generally to the rotary drilling of boreholes in the earth, and more particularly to an improved rotary drill string assembly. Specifically, the invention relates to shock isolator means for improving the drilling action of conventional rotary bits and for prolonging the life of the drill string and drilling rig.
  • drill string shock and vibration should be controlled in order to optimize bit performance, minimize hole deviation problems, decrease wear and fatigue rates throughout the drill string and surface rig equipment, and thereby reduce drilling costs.
  • Current practices of attempting vibration control at the rig floor usually result in a departure from optimum bit performance. For example, rotary speeds are sometimes altered in order to reduce vibrations, even with the knowledge that drilling rate is thereby decreased.
  • one principal object of the invention is to provide means for continuously maintaining a sustained average loading of the drill string and bit assembly whereby. adverse vibrations are minimized and a more eflicient engagement of the bit cutters with the hole bottom is accomplished.
  • a further object of the invention is to provide an integral, fluid transmissive, tubular, shock-isolating subassembly for efficient control and transmission of longitudinal and rotational forces Within a rotary drill string.
  • a novel shock isolating sub-assembly is incorporated in a drill string immediately above the drill bit.
  • the vertical flexibility of the device allows compressional shocks and vibrations to be filtered thereby increasing the life of bit teeth and bearings.
  • the device may be utilized at other locations within the drill string.
  • it may be placed near the upper end of the drill collar assembly at a position with respect to the bit which takes advantage of the natural resonant frequency of a drill collar assembly in response to compressional waves generated by dynamic vertical motions of the bit.
  • a shock isolating sub-assembly is provided in which no sliding motion or other interaction of sleeves or other parts is present to cause binding and eventual failure due to friction wear.
  • the device of the present invention is simple and inexpensive to manufacture, and at the same time provides the necessary resilient response to vertical shock and also maintaining excellent continuity of torsional force transmission.
  • the invention is a tubular shock-isolating tool, at least a portion of which consists of bellows-like convolutions.
  • the ends of the tool are adapted for connection between two joints of drill pipe or collar, or between the lowermost drill collar and a conventional bit assembly.
  • FIGURE 1 is a longitudinal sectional view of the bellows-shaped shock isolator, shown in a drill string adjacent the bit.
  • FIGURE 2 is a longitudinal sectional view of an alternate embodiment of the invention, showing an internal safety element for carrying excess tensile loads.
  • FIGURE 3 is a fragmentary longitudinal sectional view of an embodiment wherein the bellows-like convolutions are rounded.
  • a preferred embodiment of the invention comprises shock isolator 11 provided with threaded pin 12 and thread box 13 for connection in a drill string between collar 14 and bit assembly 15.
  • the tool has a circular transverse cross-section, and consists essentially of a series of bellows-like convolutions 16, formed by a corresponding series of alternate internal and external circular grooves or channels 17, preferably filled with rubber or its equivalent, as shown.
  • a tubular sleeve 18 surrounds the bellows-shaped interval of the tool as a safety feature to protect it from excess tensile loads, such as may be encountered in lifting the drill string.
  • FIGURE 2 includes a bellows-like series of convolutions 31, which are essentially the same as in the embodiment of FIGURE 1.
  • Internal tubular element 32 is a safety feature for avoiding excess tensile loads in the bellows structure.
  • flange 33 rests upon rubber cushion 34, which in turn is supported by shoulder 35.
  • the bellows structure expands, causing flange 36 to engage shoulder 37, thereby diverting excess tensile stress to tube 32.
  • Spring 38 acts to stabilize tube 32 during normal operation, when little or no tensile stress is encountered.
  • FIGURE 3 illustrates an alternate embodiment, wherein convolutions 41 are rounded to provide uniform wall thickness and reduce erosion.
  • the simplest operable embodiment of the invention consists of a thick-Walled cylinder having screw-threaded ends and a plurality of alternate internal and external circular grooves or channels spaced along a portion thereof to provide a longitudinal bellows-like flexibility substantially greater than is characteristic of the original cylinder.
  • the grooved or convoluted interval of the cylinder need not extend substantially the entire length of the tool, as shown in the drawings. Thus, a limited shock isolation effect is obtained from only a single convolution. However, at least three convolutions are generally required to provide substantial flexibility, and preferably at least five.
  • Steel is generally preferred as the construction material because of its superior strength, durability, and relatively low cost.
  • other metals and alloys are contemplated for use, including particularly aluminum and beryllium-copper alloys.
  • rubber or its equivalent is shown molded into the grooves or channels of each convolution.
  • the rubber need not bear a significant fraction of the loads imposed on the tool, although it can be designed to do so. It functions mainly to reduce erosion caused by mud flow, and to protect highly stressed areas from corrosion.
  • the safety sleeve 18 of FIGURE 1 serves no purpose during compressional loading of the bellows, and the same is true of tube 32 in FIGURE 2.
  • These safety elements are useful primarily when the bit or drill string below the shock isolator becomes stuck, and as a consequence high tensile loads are placed on the isolator.
  • the bellows-like convolutions could thus be inadvertently strained beyond their elastic limit, except for the safety element.
  • grooves or channels 17 of the illustrated embodiments are uniformly spaced along the length of the tool, and each has the same dimensions, it is within the scope of the invention to provide numerous variations of these embodiments. It is essential, however, that the grooves have a depth greater than one-half the difference between the outside and inside radii of the tool. This follows from the fact that each of convolutions 16 necessarily includes a transverse section between adjacent grooves. It is preferred that each successive internal groove be spaced from each adjacent external groove by a distance no greater than four groove widths.
  • the spring rate of -a circular bellows in pounds of force per inch of deflection, varies inversely with the number of convolutions, inversely with the square of the outside diameter, directly with approximately the cube and directly with the modulus of elasticity of the construction material.
  • the bellows-shaped portion of the present invention preferably has a wall thickness of at least A inch, an outside diameter of at least 3 inches, and a spring rate no greater than 10 pounds per inch per convolution.
  • the root diameter which is equal to the inside diameter plus twice the wall thickness, is at least one inch.
  • a convenient method of constructing the shock isolator of the invention is simply to machine a thick walled cylinder internally and externally to provide grooves or channels 17.
  • a short length of thick walled tubing having an OD. of 7" and an ID. of 5", made of S.A.E. 4140 steel having a tensile strength of 80,000 lbs. per square inch was machined externally to a depth of inch and internally to a depth of M2 inch to provide a bellows shape having -a root diameter of 5% in., and a wall thickness of A; in. It was preset, tested, and found to withstand a static vertical compressional load of 22,800 pounds at the elastic limit. It has a spring rate of 720,000 pounds per in. per convolution, and a maximum deflection of 0.0317 in. per convolution.
  • the shock isolator of the present invention possesses many advantages over prior tools designed for vibration control. Its essentially one-piece construction eliminates any need for sliding parts or fluid seals. It is conveniently designed to have a large internal bore, thus providing low hydraulic pressure loss for drilling fluid circulation. It isolates flexural shocks and vibrations as well as dynamic axial loads. Pressure differences between the interior and exterior of the tool act to provide a hydraulic load carrying capacity, in addition to mechanical support. The bellows shape stresses the metal in many ways thereby utilizing many strength properties of the material.
  • a shock isolator coupling comprising an essentially tubular element adapted for connection in a rotary drill string, at least a portion of said element consisting of bellows-like internal and external convolutions at least partially filled with a resilient material; a perimetric shoulder on said tubular element intermediate one end thereof and said convolutions, said shoulder facing said one end; and a sleeve surrounding said convolutions and attached to said tubular element intermediate said convolutions and the other end thereof, said sleeve extending beyond said shoulder and comprising a flange positioned to engage said shoulder in the event a substantial tensile load is placed on said convolutions.
  • a shock isolator coupling comprising an essentially tubular element adapted for connection in a rotary drill string, at least a portion of said element consisting of bellows-like internal and external convolutions at least partially filled with a resilient material; a shoulder within the bore of said tubular element intermediate each end thereof and said convolutions; and a second tubular element within the first named tubular element having a flange at each end thereof to engage each said shoulder in the event a substantial tensile load is applied to said convolutions.

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

Description

1966 J. H. WIGGINS, JR 3,263,446
SHOCK ISOLATOR FOR ROTARY DRILL STRING Filed Aug. 20, 1963 John H. Wiggins Jr.
INVENTOR.
BY @8, km
ATT RNEY United States Patent 3,263,446 SHOCK ISOLATOR FOR ROTARY DRILL STRING John H. Wiggins, .lra, Tulsa, Olden, assignor, by mesne assignments, to Esso Production Research Company, a corporation of Delaware Filed Aug. 20, 1963, Ser. No. 303,327 2 Claims. (El. 64-45) This invention relates generally to the rotary drilling of boreholes in the earth, and more particularly to an improved rotary drill string assembly. Specifically, the invention relates to shock isolator means for improving the drilling action of conventional rotary bits and for prolonging the life of the drill string and drilling rig.
Prior investigations have repeatedly established the occurrence of adverse vibrations in the operation of a rotary drill string, and the consequent need for incorporating a resilient shock-absorbing sub-assembly therein. Various explanations have been advanced for such vibra tions in the drill string. As can readily be seen, the bit and drill collars are elevated a short distance as each successive bit tooth or row of teeth contact the hole bottom. This alone is one source of vibration. Moreover, it has been found that each such elevation is not always followed immediately by a corresponding descent of the drill column in time for the next tooth to achieve proper contact with the hole bottom. The bit and collar may even be thrown sharply upward for a substantial time interval entirely free of engagement with the rock, following a particularly pronounced irregularity in the cutting action. Various influences retard the fall of the drill assembly following such a disturbance. The bit and I collars are quite massive and because of their high inertia are not easily returned to the hole bottom in time for the next successive cutter tooth engagement.
Regardless of their origin, drill string shock and vibration should be controlled in order to optimize bit performance, minimize hole deviation problems, decrease wear and fatigue rates throughout the drill string and surface rig equipment, and thereby reduce drilling costs. Current practices of attempting vibration control at the rig floor usually result in a departure from optimum bit performance. For example, rotary speeds are sometimes altered in order to reduce vibrations, even with the knowledge that drilling rate is thereby decreased.
Accordingly, one principal object of the invention is to provide means for continuously maintaining a sustained average loading of the drill string and bit assembly whereby. adverse vibrations are minimized and a more eflicient engagement of the bit cutters with the hole bottom is accomplished.
A further object of the invention is to provide an integral, fluid transmissive, tubular, shock-isolating subassembly for efficient control and transmission of longitudinal and rotational forces Within a rotary drill string.
In accordance with one embodiment of the present invention a novel shock isolating sub-assembly is incorporated in a drill string immediately above the drill bit. The vertical flexibility of the device allows compressional shocks and vibrations to be filtered thereby increasing the life of bit teeth and bearings.
In addition the device may be utilized at other locations within the drill string. For example, it may be placed near the upper end of the drill collar assembly at a position with respect to the bit which takes advantage of the natural resonant frequency of a drill collar assembly in response to compressional waves generated by dynamic vertical motions of the bit.
It is a further object of the invention to provide means of minimizing dynamic oscillations in a drill string by incorporating therein a device in which no sliding fluid 3,263,446 Patented August 2, 1966 sealsare required. A shock isolating sub-assembly is provided in which no sliding motion or other interaction of sleeves or other parts is present to cause binding and eventual failure due to friction wear.
The device of the present invention is simple and inexpensive to manufacture, and at the same time provides the necessary resilient response to vertical shock and also maintaining excellent continuity of torsional force transmission.
In essence, the invention is a tubular shock-isolating tool, at least a portion of which consists of bellows-like convolutions. The ends of the tool are adapted for connection between two joints of drill pipe or collar, or between the lowermost drill collar and a conventional bit assembly.
FIGURE 1 is a longitudinal sectional view of the bellows-shaped shock isolator, shown in a drill string adjacent the bit.
FIGURE 2 is a longitudinal sectional view of an alternate embodiment of the invention, showing an internal safety element for carrying excess tensile loads.
FIGURE 3 is a fragmentary longitudinal sectional view of an embodiment wherein the bellows-like convolutions are rounded.
Referring to FIGURE 1, a preferred embodiment of the invention comprises shock isolator 11 provided with threaded pin 12 and thread box 13 for connection in a drill string between collar 14 and bit assembly 15. The tool has a circular transverse cross-section, and consists essentially of a series of bellows-like convolutions 16, formed by a corresponding series of alternate internal and external circular grooves or channels 17, preferably filled with rubber or its equivalent, as shown. A tubular sleeve 18 surrounds the bellows-shaped interval of the tool as a safety feature to protect it from excess tensile loads, such as may be encountered in lifting the drill string. In this event, expansion of the bellows will cause flange 19 to engage shoulder 20, thereby diverting a fraction of such tensile loads to sleeve 18. Although the sleeve is attached by means of weld 21 in the illustrated embodiment, it is within the scope of the invention to provide a shoulder and flange or other means of holding sleeve 18 in place.
The embodiment of FIGURE 2 includes a bellows-like series of convolutions 31, which are essentially the same as in the embodiment of FIGURE 1. Internal tubular element 32 is a safety feature for avoiding excess tensile loads in the bellows structure. Thus, flange 33 rests upon rubber cushion 34, which in turn is supported by shoulder 35. Similarly, when high tensile loads are encountered, the bellows structure expands, causing flange 36 to engage shoulder 37, thereby diverting excess tensile stress to tube 32. Spring 38 acts to stabilize tube 32 during normal operation, when little or no tensile stress is encountered.
FIGURE 3 illustrates an alternate embodiment, wherein convolutions 41 are rounded to provide uniform wall thickness and reduce erosion.
The simplest operable embodiment of the invention consists of a thick-Walled cylinder having screw-threaded ends and a plurality of alternate internal and external circular grooves or channels spaced along a portion thereof to provide a longitudinal bellows-like flexibility substantially greater than is characteristic of the original cylinder. The grooved or convoluted interval of the cylinder need not extend substantially the entire length of the tool, as shown in the drawings. Thus, a limited shock isolation effect is obtained from only a single convolution. However, at least three convolutions are generally required to provide substantial flexibility, and preferably at least five.
Steel .is generally preferred as the construction material because of its superior strength, durability, and relatively low cost. However, other metals and alloys are contemplated for use, including particularly aluminum and beryllium-copper alloys.
In the drawings, rubber or its equivalent is shown molded into the grooves or channels of each convolution. The rubber need not bear a significant fraction of the loads imposed on the tool, although it can be designed to do so. It functions mainly to reduce erosion caused by mud flow, and to protect highly stressed areas from corrosion.
The safety sleeve 18 of FIGURE 1 serves no purpose during compressional loading of the bellows, and the same is true of tube 32 in FIGURE 2. These safety elements are useful primarily when the bit or drill string below the shock isolator becomes stuck, and as a consequence high tensile loads are placed on the isolator. The bellows-like convolutions could thus be inadvertently strained beyond their elastic limit, except for the safety element.
While grooves or channels 17 of the illustrated embodiments are uniformly spaced along the length of the tool, and each has the same dimensions, it is within the scope of the invention to provide numerous variations of these embodiments. It is essential, however, that the grooves have a depth greater than one-half the difference between the outside and inside radii of the tool. This follows from the fact that each of convolutions 16 necessarily includes a transverse section between adjacent grooves. It is preferred that each successive internal groove be spaced from each adjacent external groove by a distance no greater than four groove widths.
The spring rate of -a circular bellows, in pounds of force per inch of deflection, varies inversely with the number of convolutions, inversely with the square of the outside diameter, directly with approximately the cube and directly with the modulus of elasticity of the construction material. The bellows-shaped portion of the present invention preferably has a wall thickness of at least A inch, an outside diameter of at least 3 inches, and a spring rate no greater than 10 pounds per inch per convolution. The root diameter, which is equal to the inside diameter plus twice the wall thickness, is at least one inch.
As readily appreciated by one skilled in the art, residual stresses are an advantage in loaded members if they oppose the working stresses. In the case of bellows springs, longer life and increases up to 100 percent, as determined by tests (30 percent is common in coil springs), in maximum allowable working stress can be obtained by controlling or generating residual stresses in accordance with this general rule. To effect this control, stress relief and cold setting or presetting are usually performed.
A convenient method of constructing the shock isolator of the invention is simply to machine a thick walled cylinder internally and externally to provide grooves or channels 17. For example, a short length of thick walled tubing having an OD. of 7" and an ID. of 5", made of S.A.E. 4140 steel having a tensile strength of 80,000 lbs. per square inch, was machined externally to a depth of inch and internally to a depth of M2 inch to provide a bellows shape having -a root diameter of 5% in., and a wall thickness of A; in. It was preset, tested, and found to withstand a static vertical compressional load of 22,800 pounds at the elastic limit. It has a spring rate of 720,000 pounds per in. per convolution, and a maximum deflection of 0.0317 in. per convolution.
The shock isolator of the present invention possesses many advantages over prior tools designed for vibration control. Its essentially one-piece construction eliminates any need for sliding parts or fluid seals. It is conveniently designed to have a large internal bore, thus providing low hydraulic pressure loss for drilling fluid circulation. It isolates flexural shocks and vibrations as well as dynamic axial loads. Pressure differences between the interior and exterior of the tool act to provide a hydraulic load carrying capacity, in addition to mechanical support. The bellows shape stresses the metal in many ways thereby utilizing many strength properties of the material.
While various embodiments have been specifically described, other variations and modifications will occur to those skilled in the art, without departing from the proper scope and spirit of the invention.
What is claimed is:
1. A shock isolator coupling comprising an essentially tubular element adapted for connection in a rotary drill string, at least a portion of said element consisting of bellows-like internal and external convolutions at least partially filled with a resilient material; a perimetric shoulder on said tubular element intermediate one end thereof and said convolutions, said shoulder facing said one end; and a sleeve surrounding said convolutions and attached to said tubular element intermediate said convolutions and the other end thereof, said sleeve extending beyond said shoulder and comprising a flange positioned to engage said shoulder in the event a substantial tensile load is placed on said convolutions.
2. A shock isolator coupling comprising an essentially tubular element adapted for connection in a rotary drill string, at least a portion of said element consisting of bellows-like internal and external convolutions at least partially filled with a resilient material; a shoulder within the bore of said tubular element intermediate each end thereof and said convolutions; and a second tubular element within the first named tubular element having a flange at each end thereof to engage each said shoulder in the event a substantial tensile load is applied to said convolutions.
References Cited by the Examiner MILTON KAUFMAN, Primary Examiner.
ROBERT C. RIORDON, BROUGHTON G. DURHAM,
Examiners. H. C. COE, Assistant Examiner.

Claims (1)

1. A SHOCK ISOLATOR COUPLING COMPRISING AN ESSENTIALLY TUBULAR ELEMENT ADAPTED FOR CONNECTION IN A ROTARY DRILL STRING, AT LEAST A PORTION OF SAID ELEMENT CONSISTING OF BELLOWS-LIKE INTERNAL AND EXTERNAL CONVOLUTIONS AT LEAST PARTIALLY FILLED WITH A RESLILENT MATERIAL; A PERIMETRIC SHOULDER ON SAID TUBULAR ELEMENT INTERMEDIATE ONE END THEREOF AND SAID CONVOLUTIONS, SAID SHOULDER FACING SAID ONE END; AND A SLEEVE SURROUNDING SAID CONVOLUTIONS AND ATTACHED TO SAID TUBULAR ELEMENT INTERMEDIATE SAID CONVOLUTIONS AND THE OTHER END THEREOF, SAID SLEEVE EXTENDING
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447340A (en) * 1967-05-29 1969-06-03 Smith International Resilient unit for drill strings
US3926265A (en) * 1974-06-10 1975-12-16 Hydroacoustic Inc Drill steel for percussive drilling devices
US4030553A (en) * 1975-06-23 1977-06-21 Rockwell Thomas H Percussion tool with noise reducing characteristics and method of making
US4066995A (en) * 1975-01-12 1978-01-03 Sperry Rand Corporation Acoustic isolation for a telemetry system on a drill string
US4560012A (en) * 1984-06-20 1985-12-24 Mcneely Jr Branch M Drill collar structure for use in deviated well bore drilling
BE1003211A3 (en) * 1990-10-15 1992-01-14 Diamant Boart Stratabit S A En METHOD AND DEVICE FOR DAMPING VIBRATIONS IN A ROTATED DRIVED ROD TRAIN.
US5174340A (en) * 1990-12-26 1992-12-29 Shell Oil Company Apparatus for preventing casing damage due to formation compaction
US5269570A (en) * 1991-04-17 1993-12-14 Nunley Dwight S Flexible casing for well boreholes
US5595254A (en) * 1993-09-03 1997-01-21 Baker Hughes Incorporated Tilting bit crown for earth-boring drills
US5833541A (en) * 1993-07-23 1998-11-10 Turner; William E. Elastomeric joints having interlocking threaded portions
US20080066965A1 (en) * 2006-09-20 2008-03-20 Schlumberger Technology Corporation, Incorporated In The State Of Texas Methods and apparatus for attenuating drillstring vibrations
US20120199400A1 (en) * 2009-07-20 2012-08-09 Assn Pour La Rech Et Le Dev De Meth Et Process Ind Drill pipe and corresponding drill fitting
US20140228132A1 (en) * 2011-10-07 2014-08-14 Ringfeder Power-Transmission Gmbh Compensating coupling for transmitting torques
EP2379907A4 (en) * 2009-01-20 2017-10-11 Hunting Energy Services (Drilling Tools), Inc. Downhole vibration dampener
US10077615B2 (en) 2015-07-31 2018-09-18 ASDR Canada Inc. Sound absorber for a drilling apparatus
US20230407712A1 (en) * 2022-06-10 2023-12-21 Baker Hughes Oilfield Operations Llc Flexible coupler for reducing torsional oscillations

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1871227A (en) * 1928-08-29 1932-08-09 Cleveland Steel Products Corp Flexible coupling
US1889868A (en) * 1930-07-21 1932-12-06 Gustavus A Montgomery Double box rotary tool joint
US2301105A (en) * 1941-05-01 1942-11-03 Smith Corp A O Safety collar for drills
CH272052A (en) * 1948-10-14 1950-11-30 Elmpt Carl Shaft coupling.
US2756022A (en) * 1953-05-25 1956-07-24 Thomas E Reed Shock absorber coupling for rotary drill stem
FR1169407A (en) * 1957-03-13 1958-12-29 Turbine or underground motor for soil drilling
US2870617A (en) * 1954-04-26 1959-01-27 Melville F Peters Control of torque and fluid flow in sealed drives
US3122902A (en) * 1961-08-28 1964-03-03 Drilprodco Inc Drilling shock absorber
US3156106A (en) * 1962-08-17 1964-11-10 Gist Mfg Company Drill string shock absorbers

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1871227A (en) * 1928-08-29 1932-08-09 Cleveland Steel Products Corp Flexible coupling
US1889868A (en) * 1930-07-21 1932-12-06 Gustavus A Montgomery Double box rotary tool joint
US2301105A (en) * 1941-05-01 1942-11-03 Smith Corp A O Safety collar for drills
CH272052A (en) * 1948-10-14 1950-11-30 Elmpt Carl Shaft coupling.
US2756022A (en) * 1953-05-25 1956-07-24 Thomas E Reed Shock absorber coupling for rotary drill stem
US2870617A (en) * 1954-04-26 1959-01-27 Melville F Peters Control of torque and fluid flow in sealed drives
FR1169407A (en) * 1957-03-13 1958-12-29 Turbine or underground motor for soil drilling
US3122902A (en) * 1961-08-28 1964-03-03 Drilprodco Inc Drilling shock absorber
US3156106A (en) * 1962-08-17 1964-11-10 Gist Mfg Company Drill string shock absorbers

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447340A (en) * 1967-05-29 1969-06-03 Smith International Resilient unit for drill strings
US3926265A (en) * 1974-06-10 1975-12-16 Hydroacoustic Inc Drill steel for percussive drilling devices
US4066995A (en) * 1975-01-12 1978-01-03 Sperry Rand Corporation Acoustic isolation for a telemetry system on a drill string
US4030553A (en) * 1975-06-23 1977-06-21 Rockwell Thomas H Percussion tool with noise reducing characteristics and method of making
US4560012A (en) * 1984-06-20 1985-12-24 Mcneely Jr Branch M Drill collar structure for use in deviated well bore drilling
BE1003211A3 (en) * 1990-10-15 1992-01-14 Diamant Boart Stratabit S A En METHOD AND DEVICE FOR DAMPING VIBRATIONS IN A ROTATED DRIVED ROD TRAIN.
WO1992007163A1 (en) * 1990-10-15 1992-04-30 Diamant Boart - Stratabit S.A. Method and device for absorbing vibration in a rotating drill pipe string
US5174340A (en) * 1990-12-26 1992-12-29 Shell Oil Company Apparatus for preventing casing damage due to formation compaction
US5269570A (en) * 1991-04-17 1993-12-14 Nunley Dwight S Flexible casing for well boreholes
US5833541A (en) * 1993-07-23 1998-11-10 Turner; William E. Elastomeric joints having interlocking threaded portions
US5595254A (en) * 1993-09-03 1997-01-21 Baker Hughes Incorporated Tilting bit crown for earth-boring drills
US5671816A (en) * 1993-09-03 1997-09-30 Baker Hughes Incorporated Swivel/tilting bit crown for earth-boring drills
US20080066965A1 (en) * 2006-09-20 2008-03-20 Schlumberger Technology Corporation, Incorporated In The State Of Texas Methods and apparatus for attenuating drillstring vibrations
WO2008036498A1 (en) * 2006-09-20 2008-03-27 Services Petroliers Schlumberger Methods and apparatus for attenuating drillstring vibrations
US7828082B2 (en) 2006-09-20 2010-11-09 Schlumberger Technology Corporation Methods and apparatus for attenuating drillstring vibrations
US20110011644A1 (en) * 2006-09-20 2011-01-20 Schlumberger Technology Corporation Methods and apparatus for attenuating drillstring vibrations
US7984771B2 (en) 2006-09-20 2011-07-26 Schlumberger Technology Corporation Methods and apparatus for attenuating drillstring vibrations
EP2379907A4 (en) * 2009-01-20 2017-10-11 Hunting Energy Services (Drilling Tools), Inc. Downhole vibration dampener
US20120199400A1 (en) * 2009-07-20 2012-08-09 Assn Pour La Rech Et Le Dev De Meth Et Process Ind Drill pipe and corresponding drill fitting
US8915315B2 (en) * 2009-07-20 2014-12-23 Vam Drilling France Drill pipe and corresponding drill fitting
US20140228132A1 (en) * 2011-10-07 2014-08-14 Ringfeder Power-Transmission Gmbh Compensating coupling for transmitting torques
US9206857B2 (en) * 2011-10-07 2015-12-08 Ringfeder Power-Transmission Gmbh Compensating coupling for transmitting torques
US10077615B2 (en) 2015-07-31 2018-09-18 ASDR Canada Inc. Sound absorber for a drilling apparatus
US20230407712A1 (en) * 2022-06-10 2023-12-21 Baker Hughes Oilfield Operations Llc Flexible coupler for reducing torsional oscillations
US12385328B2 (en) * 2022-06-10 2025-08-12 Baker Hughes Oilfield Operations Llc Flexible coupler for reducing torsional oscillations

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