US20140332278A1 - Extended reach drilling - Google Patents

Extended reach drilling Download PDF

Info

Publication number
US20140332278A1
US20140332278A1 US14/366,377 US201214366377A US2014332278A1 US 20140332278 A1 US20140332278 A1 US 20140332278A1 US 201214366377 A US201214366377 A US 201214366377A US 2014332278 A1 US2014332278 A1 US 2014332278A1
Authority
US
United States
Prior art keywords
frequencies
drill string
frequency
drill
top hammer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/366,377
Other languages
English (en)
Inventor
Gregory Donald West
Mark Christopher Cunliffe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flexidrill Ltd
Original Assignee
Flexidrill Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flexidrill Ltd filed Critical Flexidrill Ltd
Priority to US14/366,377 priority Critical patent/US20140332278A1/en
Assigned to FLEXIDRILL LIMITED reassignment FLEXIDRILL LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CUNLIFFE, Mark Christopher, WEST, GREGORY DONALD
Publication of US20140332278A1 publication Critical patent/US20140332278A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • E21B6/02—Drives for drilling with combined rotary and percussive action the rotation being continuous
    • E21B6/04—Separate drives for percussion and rotation
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
    • 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
    • E21B1/00—Percussion drilling
    • E21B1/02—Surface drives for drop hammers or percussion drilling, e.g. with a cable
    • 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
    • E21B1/00—Percussion drilling
    • E21B1/02—Surface drives for drop hammers or percussion drilling, e.g. with a cable
    • E21B1/04—Devices for reversing the movement of the rod or cable at the surface
    • 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
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • 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
    • E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production

Definitions

  • the present invention relates to extended reach drilling.
  • the invention more particularly, but not solely, relates to methods of extended reach drilling, with a drilling apparatus able to effect extended reach drilling and operation of a downhole drill string in extended reach drilling with the generation and transfer of enabling or synergistic spread of vibration.
  • Methods of enhancing the reach of a drill string and downhole tooling using a top hammer comprising, without specifically tuning for resonance, generating a spectrum where the output energy of the hammering impacts at least to some extent is localised to first order of magnitude spread of frequencies, yet the configuration uphole of the drill string supporting assembly (the impacting or vibrational device) is such that, by impedance, excitation, mass affects, or the like, a greater spectral spread of the vibrational energy, and of frequencies over several orders of magnitude, passes downhole and/or in combination with some subsequent frequencies being reflected back uphole thereby to enable the extended reach drill string operations, and operating the drill string with such a modified spectrum of vibrational frequencies passing into it.
  • Top hammer drilling has been used for many years within the mining industry to rapidly advance drill bits into ground formations.
  • top hammers have traditionally been energised by either pneumatic or hydraulic power. Such hammers are designed to generate large impact shock waves with minimal mechanical impedance between the impacting piston and the drive shaft (the connection between the piston and the drill rods) via drill rods to a drill bit and providing large amplitude of movement, giving very rapid penetration through relatively short distances, as has been the requirement for blast holes—typically up to 30 meters.
  • “Sonic” drill rigs (which aim to “tune” the vibration input to a specific resonant mode, and generally achieve the resonance by rotating eccentric masses), are also depth limited (owing to the substantial horsepower requirements and the practicalities of mechanical devices operating at extremely high revolutions per minute (RPM's) which are required with these devices when trying to drill at second, third, or fourth resonant modes) to generally around 100 meters.
  • RPM's revolutions per minute
  • the present invention envisages using impact pulses and wide spread bands of vibrations to advantage when drilling.
  • the invention also relates to the use downhole of a first frequency, or a first frequency range (e.g. able to break rock with or without resonance) and a distinct second frequency, or second frequency range (e.g. to avoid formational grab on the drill string), to excite, for different functionalities, the drill string and/or the tool or bit.
  • N any number (N) of frequencies or frequency ranges can also be used to advantage.
  • the invention is a method of extended reach drilling which comprises
  • top hammer assembly from which a drill string is dependant, being configured by mass or cross section impedances that create excitations to provide multiple localised bands of frequencies that differ from and are not harmonics of the band or bands of frequencies to be generated at the strike interface, variation of frequencies sufficient to allow extended reach drilling, and
  • top hammer assembly during operation of the drill string in an extended reach drilling operation, without tuning the drillstring for resonance.
  • the invention is a method of extended reach drilling which comprises
  • top hammer assembly from which a drill string is dependant, the top hammer assembly, being configured by impedances or masses to increase the spread of non-harmonic vibrational frequencies to pass into and downhole along the drill string from those generated at the impact interface of the top hammer assembly,
  • the invention is a method of enhancing the reach of a drill string downhole using a top hole hammer functionality, the method comprising, without tuning for resonance,
  • the invention is a drilling apparatus having a top hammer functionality able to provide vibration to a drill string that extends downhole and to allow deep reach drilling activities characterised in that a spectrum of different orders of magnitude of vibrational frequency is passed into the drill string without reference to its length, from an impact generated spectrum of lesser order of magnitude of vibrational frequency spread, the impact generated spectrum not, of itself, able to allow the deep reach drilling activities.
  • the impulse length of the stress waves are very short and synergistically allow extended reach drilling operations.
  • apparatus including a drill string and drill string dependent tool where there is provision from within and/or without the drill string to generate for and/or to the drill string, for and/or to the tool, or both, a frequency or a range of frequencies to provide multiple vibration(s).
  • the range or frequency could be defined as going from a first to a Nth range.
  • N any number (N) of frequencies or frequency ranges can be used.
  • frequencies can be generated (e.g. by an oscillator) to be incident downhole some or several frequencies can be non-incident (e.g. reflected).
  • Such reflected and/or incident frequencies may be caused to vary by the nature of the overall apparatus.
  • an oscillating (vibrational)apparatus that outputs at least two vibrational frequencies and/or frequency ranges with first frequency or frequencies in the kilohertz range e.g. (>1000 Hz) and the second frequency or frequencies in the tens hertz range e.g. ( ⁇ 100 Hz) for drilling through sub terrain.
  • Envisaged are frequencies within the following ranges 0-100 Hz, 100-1000 Hz, 1000-10,000 Hz, etc.
  • a multi-oscillating (vibrational) apparatus capable of being tailored to drill through sub terrain reliant on specified or discrete frequency or frequency ranges for specific purposes in the drilling function.
  • an impact/vibrational assembly capable of impacting a drill bit on a bore face, the assembly comprising or including
  • a drill head that is capable of attaching to the drill string
  • each of the drill string, drill bit and drill head each have a mass, or masses, that can be excited to vibrate at functional frequencies.
  • the drill head provides with a striking directly some functional frequencies and said masses responsive to the striking provides other functional frequencies to which at least one of the drill string and drill bit responds with an excitation.
  • the excitation is by means of one or more oscillator(s) whether in the drill string, in the drill head, in the drill bit, or some hybrid of those choices.
  • the device may optionally or preferably have dampers that negate non useful frequencies.
  • the primary vibrational frequencies are totally or in part generated by, hydraulic, pneumatic, eccentric drive, electromagnetic, electric, or mechanical top hammer functionality.
  • the invention is A top hammer for use with/in drilling apparatus at an input frequency in extended reach drilling operations configured with mass or impedances that limit resonance(s) in the drilling apparatus at the input frequency by creating multiple localised bands of frequencies that differ from and are not harmonics of the band or bands of frequencies (beat frequency) generated at a strike interface of the top hammer, the variation of frequencies sufficient to allow extended reach drilling.
  • extended reach contemplates drilling to greater, and indeed very much greater than, say, 50 metres.
  • the capabilities are to allow downhole operations (drilling, reaming, etc) that extend for deeper than the depths of 30 metres, 50 metres and 100 metres acknowledged as depth limits for existing techniques.
  • This invention may also be said broadly to consist in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, and any or all combinations of any two or more of said parts, elements or features, and where specific integers are mentioned herein which have known equivalents in the art to which this invention relates, such known equivalents are deemed to be incorporated herein as if individually set forth.
  • FIG. 1 shows a conventional hydraulic/pneumatic top hammer arrangement, the impact device being on the right and involving a hammering shuttle (commensurate to its impact face in cross-section) responsive to input pressure(s) and exhaust actuation (shown diagrammatically) and subject to drill string rotation apparatus to drive a downhole drill bit or other downhole tool, these top hammers generating significant impact force of (relatively) long duration which provides significant force and large amplitudes of movement of the drill bit into the formation—but with most of the impact energy in frequencies at or near the beat frequency (the number of hammer impacts per second) but without generating significant additional frequency rich vibrational content of very short duration
  • FIG. 2 shows a typical impact graph resulting at the interface from the hammering effect of an arrangement as in FIG. 1 ,
  • FIG. 3 shows a sonic drill arrangement, this time reliant on eccentrics to generate substantially sinusoidal inputs, but again showing a drill string rotational apparatus and a downhole drill bit,
  • FIG. 4 shows a typical sinusoidal output of such an eccentric driven vibrational arrangement for sonic drilling
  • FIG. 5 is the conceptual arrangement of the present invention showing an impact device to the right acting down a drill string to a drill bit or other downhole tool (optionally via a spring), the impact device being hereinafter described in more detail by reference to an example,
  • FIG. 6 shows an extended reach hydraulic or pneumatic top hammer arrangement as an example in accordance with the present invention to be the impact device at the right of, for example, the layout as in FIG. 5 or to operate without the spring arrangement shown,
  • FIG. 7 shows a still further embodiment reliant on a hydraulic or pneumatic top hammer arrangement
  • FIGS. 5 , 6 , & 7 showing embodiments of an extended reach Top hammer device, whereby the various masses, dimensional changes and stiffnesses of the assembly encourage a broad band pulse of vibrational energy to be transmitted to the dill string when excited by a short duration impact ( ⁇ 0.0005 s) of relatively low energy (compared with a conventional Top hammer) whereby the high frequency vibrations are believed to reduce frictional losses in the drill string and the drill bit (or other tools) vibrate at a multitude of frequencies and low-mid frequency vibrations excite drill rod vibrational modes with very small amplitude of movement (compared to a conventional Top hammer, and
  • FIG. 8 shows a typical spectral plotplot (Amplitude/Frequency) of the response downhole resulting from an impact when using an extended top reach hammer such as shown in FIG. 5 , 6 , or 7
  • Resonance devices (such as eccentric drive “sonic” devices) strive to resonate the entire drill string—thus causing an axial (hammering) movement back and forth of the drill bit.
  • an impact device 1 with a reciprocatable piston, anvil or shuttle 2 as the hammer to strike at least one impact face 3 forming part of or connecting vibrationally to the drill string of drill rods 4 down to the downhole tool 5 .
  • a rotational drive apparatus 6 to rotate the drill string of rods 4 is provided.
  • This design results in a very clean impact wave at (substantially) the frequency of the strike of the piston(beat frequency) with minimal loss of energy through the system and maximum force and displacement at the rock face. See FIG. 2 .
  • This arrangement drills hard rock very rapidly—although the distance (or depth) capability is typically less than 50 meters.
  • the eccentric vibrational apparatus 8 of FIG. 3 generates likewise into a drill string of rods 7 to a drill bit 9 , the drill string being rotatable by a drive 10 .
  • the sonic drill system of FIG. 3 generates a smooth sinusoidal force wave (as in FIG. 4 ) from the input of the rapidly rotating eccentric masses.
  • the depth to which sonic drill rigs can operate is ultimately dictated by the speed to which the eccentrics can be rotated. It is also important to note that there is a one to one relationship between the input frequency and the drill rod/bit frequency (e.g. if 100 Hz is required to maintain resonance in the drill string—then an input frequency of 100 Hz is required).
  • This device is a very complex apparatus that uses piezoelectric transducers, in conjunction with complex algorithms and computer control, to try and resonate a drill bit at a similar frequency to the resonant frequency of the formation being drilled.
  • Keskiniva WO 2010/037905 A1 has a feed back device for controlling reflected stress waves.
  • Keskiniva U.S. Pat. No. 7,891,437B2 looks to optimise impact force and the length of the stress wave.
  • Watanabe U.S. Pat. No. 6,454,021 B1 uses a magnetostrictive material with an electrical pulse and coil to alter the pulse characteristics of the drilling machine.
  • Our device by contrast is not a feed back driven device—nor is it like a hammer drill, rod and bit or a sonic drill rod and bit. Rather by having an understanding of the frequency(s) generated by either a hammering device or resonant device—testing has shown that it is possible to design the ground engaging tool as a separate spring/mass system that itself becomes excited—independently of any excitation or vibration happening within the drill string—giving impressive productivity gains. See the discussion below about FIG. 8 .
  • FIG. 5 shows a system with an impact device 11 such as will be described with respect to the present invention driving directly or indirectly down a drill string of rods 12 to a drill bit or other downhole tool 13 .
  • a spring 14 can be provided in the drill string.
  • FIG. 6 shows a preferred embodiment.
  • An impact device 15 interacts with a drill string 16 to a drill bit 17 or other downhole tool.
  • the drill string 16 is one with drill rods 18 and a drive to rotate the drill string. This drive 19 can be positioned appropriately.
  • Masses 20 and 21 are movable relative to the surrounding structure 22 (e.g. by moving one or the other of the shuttling anvil or its surround, or both). As can be seen, at least for the mass 20 , there is shown a pair of opposed impact faces A and B to act alternately and respectively with impact faces A and B of the surround structure 22 .
  • FIG. 7 shows another alternative way (again with input pressures and exhaust pressures) able to cause, as a piston, the member 23 , as an anvil, to move backwards and forwards in alignment with the drill string direction so as to impact on impact face 24 and impact face 25 .
  • an isolation spring 26 can be provided and there can be input to turn the drill bit from zone 27 .
  • FIG. 6 With regards to the extended reach hydraulic or pneumatic top hammer, of which FIG. 6 is an example, it is clear that the design is significantly different from both the conventional top hammers or sonic drive systems.
  • the initial impact frequency is broken into multiple frequencies of varying magnitude as the impact wave travels longitudinally through the hammer and causes the primary and secondary masses (there may be more than two) connected by various stiffnesses to vibrate over a wide band of distinct frequencies. These distinct stress wave vibrations move down the drill string to the drill bit.
  • the multiple frequencies generated by this arrangement can clearly be seen in the response spectrum plot of FIG. 8 —with distinct frequencies in the 10's of Hz—100's of Hz and 1,000 Hz. Each of these multiple frequencies are the result of a single input strike—in reality the impact the impact (strike) rate of this hammer is from 50 Hz to many hundreds of Hz. These high frequency impacts are readily achievable if the hammer is set up to impact in both directions (on both the A-A faces and the B-B impact faces).
  • a hammer that provides an initial impact or hitting force of 40 tonnes will provide an output force at the drill bit of between 12-15 tonnes.
  • Such a hammer will be operated at 50 Hz.
  • the reduction in peak force, being between 25-27 tonnes, is into the creation of the multiple frequencies as shown in the spectral plot of FIG. 8 or some other version with multiple localised bands of frequencies, each with its own amplitude spread.
  • the data (spectral plot) of FIG. 8 shows how a reamer can be excited to over 1,000 Hz.
  • the input frequency from the top hammer while only generating 50 Hz resulted in dramatically faster penetration rates owing to the response.
  • FIGS. 6 and 7 suggest how a hydraulic or pneumatic top hammer can achieve outcomes wanted.
  • the piston or hammer is propelled into the drive shaft by (probably) hydraulic or pneumatic energy, or mechanical energy (e.g. rotating eccentric masses).
  • hydraulic or pneumatic energy or mechanical energy (e.g. rotating eccentric masses).
  • the top hammer assembly usage in the extended reach drilling operations is characterised in that an impact produced range of vibrations in the range of from 0 to 100 Hz, not sufficiently of an energy to allow extended reach drilling operations, is modified, by passive configurational features of the assembly, to allow and/or produce bands of vibrations in each of the ranges 0 to 100 Hz, 100 Hz to 1000 Hz and 1000Hz to 10000 Hz which collectively and synergistically allow extended reach drilling operations.
  • the apparatus is able to deliver two (or more) identifiable frequency bands via the drill string to the formation that is being drilled.
  • Such frequencies can be generated by a top hammer apparatus that is made up of different components—wherein each component has differing masses each connected by varying stiffness elements and varying ratio dampers that results in the apparatus having several differing natural frequencies.
  • Each natural frequency can be determined by the usual formulae for such systems with appropriate changes made to the masses and stiffness of the material of each component to alter the natural frequencies generated.
  • the present invention is to generate multi frequencies that allows drilling in various formations to long distances—potentially hundreds of meters.
  • the specific vibrations work to minimise friction on the drill string, and are sufficient to allow competent rock formations to be penetrated.
  • the frequencies could provide at least one frequency in the kilohertz range (above one thousand Hz) and another frequency operating in the tens of Hz range (e.g. 60 Hz).
  • Such frequencies are dependent on the masses of each individual part making up the drilling assembly, where each part has its own inherent natural frequencies such that the combination of frequencies generated can enhance, cancel out, or maintain the multitude of frequencies generated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
US14/366,377 2011-12-19 2012-12-18 Extended reach drilling Abandoned US20140332278A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/366,377 US20140332278A1 (en) 2011-12-19 2012-12-18 Extended reach drilling

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NZ597197 2011-12-19
NZ59719711 2011-12-19
US201261594072P 2012-02-02 2012-02-02
US14/366,377 US20140332278A1 (en) 2011-12-19 2012-12-18 Extended reach drilling
PCT/NZ2012/000240 WO2013095164A1 (en) 2011-12-19 2012-12-18 Extended reach drilling

Publications (1)

Publication Number Publication Date
US20140332278A1 true US20140332278A1 (en) 2014-11-13

Family

ID=48668890

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/366,377 Abandoned US20140332278A1 (en) 2011-12-19 2012-12-18 Extended reach drilling

Country Status (3)

Country Link
US (1) US20140332278A1 (de)
EP (1) EP2795032A4 (de)
WO (1) WO2013095164A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016151091A (ja) * 2015-02-16 2016-08-22 古河ロックドリル株式会社 さく岩機
US20180010439A1 (en) * 2016-07-07 2018-01-11 Sandvik Mining And Construction Oy Component for rock breaking system
CN109441385A (zh) * 2018-12-04 2019-03-08 湖北三峡职业技术学院 用于便携式钻探的激振装置
US11555351B2 (en) * 2020-11-19 2023-01-17 Dalian University Of Technology Spiral impact drilling machine applicable to rock and soil and construction method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE542131C2 (en) 2018-03-28 2020-03-03 Epiroc Rock Drills Ab A percussion device and a method for controlling a percussion mechanism of a percussion device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5735358A (en) * 1996-06-06 1998-04-07 Ingersoll-Rand Company Indexing percussive drilling bit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541795C2 (de) * 1975-09-19 1985-09-26 Helmut Dipl.-Ing. 6200 Wiesbaden Sieke Vorrichtung zum Tiefbohren
AT407919B (de) * 1998-01-19 2001-07-25 Boehler Pneumatik Internat Gmb Pneumatisch oder hydraulisch betreibbarer hammer und verwendung des hammers zum offenstellen oder zum verschliessen einer abstichöffnung eines metallurgischen gefässes
US6571870B2 (en) * 2001-03-01 2003-06-03 Schlumberger Technology Corporation Method and apparatus to vibrate a downhole component
FI114290B (fi) * 2003-02-21 2004-09-30 Sandvik Tamrock Oy Ohjausventtiili ja järjestely iskulaitteessa
WO2004113668A1 (en) * 2003-06-20 2004-12-29 Flexidrill Limited Sonic heads and assemblies and uses thereof
CN102926662B (zh) * 2006-06-09 2015-04-15 阿伯丁大学大学评议会 共振增强钻探的方法和设备
US8256534B2 (en) * 2008-05-02 2012-09-04 Baker Hughes Incorporated Adaptive drilling control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5735358A (en) * 1996-06-06 1998-04-07 Ingersoll-Rand Company Indexing percussive drilling bit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016151091A (ja) * 2015-02-16 2016-08-22 古河ロックドリル株式会社 さく岩機
US20180010439A1 (en) * 2016-07-07 2018-01-11 Sandvik Mining And Construction Oy Component for rock breaking system
US10550685B2 (en) * 2016-07-07 2020-02-04 Sandvik Mining and Constuction Oy Component for rock breaking system
CN109441385A (zh) * 2018-12-04 2019-03-08 湖北三峡职业技术学院 用于便携式钻探的激振装置
US11555351B2 (en) * 2020-11-19 2023-01-17 Dalian University Of Technology Spiral impact drilling machine applicable to rock and soil and construction method

Also Published As

Publication number Publication date
EP2795032A1 (de) 2014-10-29
WO2013095164A1 (en) 2013-06-27
EP2795032A4 (de) 2016-01-20

Similar Documents

Publication Publication Date Title
US9068400B2 (en) Resonance enhanced rotary drilling
US20140332278A1 (en) Extended reach drilling
US20170175446A1 (en) Force Stacking Assembly for Use with a Subterranean Excavating System
US9587443B2 (en) Resonance enhanced rotary drilling module
US7730970B2 (en) Drilling efficiency through beneficial management of rock stress levels via controlled oscillations of subterranean cutting levels
KR20090024787A (ko) 공진이 향상된 드릴링 장치 및 방법
US20220049560A1 (en) Device for generating an axial load in a drill string assembly
EP3555410A1 (de) Hybridbohrmeissel
AU2007302838B2 (en) Percussion device and rock drilling machine
CN202249765U (zh) 一种共振钻井装置
EP3775484B1 (de) Schlagvorrichtung und verfahren zur steuerung des schlagwerks einer schlagvorrichtung
US10370901B2 (en) Steering system
ZA200702367B (en) Method for breaking rock
RU2209913C1 (ru) Способ разрушения горных пород ударными импульсами и устройство для его реализации
BR112012005823B1 (pt) método para controlar um trépano rotativo reforçado por ressonância que compreende uma broca de perfuração rotativa e um oscilador para aplicar uma carga de oscilação axial à broca de perfuração, aparelho, e trépano rotativo reforçado por ressonância

Legal Events

Date Code Title Description
AS Assignment

Owner name: FLEXIDRILL LIMITED, NEW ZEALAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WEST, GREGORY DONALD;CUNLIFFE, MARK CHRISTOPHER;REEL/FRAME:033400/0743

Effective date: 20140710

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION