US3658138A - Process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and apparatus therefor - Google Patents

Process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and apparatus therefor Download PDF

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US3658138A
US3658138A US30534A US3658138DA US3658138A US 3658138 A US3658138 A US 3658138A US 30534 A US30534 A US 30534A US 3658138D A US3658138D A US 3658138DA US 3658138 A US3658138 A US 3658138A
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tool
ratio
value
speed
tensile stress
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Jean Charles Gosselin
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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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
    • E21B45/00—Measuring the drilling time or rate of penetration
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/084—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with flexible drawing means, e.g. cables
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes

Definitions

  • ABSTRACT A process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa, comprising the steps of alternately increasing and decreasing the load on the tool about its optimum value by acting on the tensile stress exerted on the drill string, thereby defining periods of increase and periods of decrease of the ratio (AVa/T) which is, with a changed sign the ratio between the variation of the penetration speed of the tool and the corresponding variation of the tensile stress exerted on the drill string, of controlling the passage from a tensile stress-increasing period, at the latest when the ratio -(AVa/T) attains, while decreasing, a lower limit value and of controlling the passage from a tensile stressdecreasing period to
  • the bottom motors such as turbines used in the turbodrilling process and the series wound or compound electric motors used in the so-called electrodrilling process have this characteristic relationship between torque and motor running speed.
  • the scope of the invention is not limited to the case where the driving motor of the tool is directly coupled therewith at the lower end of the drill string, but also includes the case where the tool is driven by rotation of the drill string through a surface motor provided that it communicates to the tool a torque which is a decreasing function of the rotation speed thereof.
  • the optimum value of the weight on the tool, to which corresponds the maximum penetration speed, varies according to the nature of the formations traversed by the bore hole.
  • the essential object of the present invention is to provide a process and an apparatus for a regulation, optionally completely automatic, of the weight on the drilling tool, so as to keep the penetration speed of the tool as close as possible to its maximum value for each of the geological strata traversed by the bore hole.
  • the process of the invention whereby this object is achieved, is characterized in that the value of the load on the tool is alternatively decreased and increased about its optimum value, by correspondingly increasing and decreasing the tensile stress exerted on the drill string and accordingly the ratio (dVa/dT) which is the ratio with a changed sign, of the variation of the penetration speed of the tool to the corresponding variation of the tensile stress at a given point of the drill string, in that the passage from a tensile stress increasing phase to a tensile stress decreasing phase is initiated at the latest when the value of said ratio (dVa/dT) during its decreasing phase has reached a lower limit-value and the passage from a decreasing to an increasing phase for said tensile stress is initiated at the latest when the value of said ratio has reached an upper limit-value, said two limit-values being preselected and adjustable.
  • the reversing of the direction of variation of the tensile stress exerted on the drill string may be effected before the ratio (dVa/dT) reaches any one of said limitvalues, in the case where at least another operating parameter of the drilling apparatus, such as the tensile stress T exerted on the drill string or the rotation speed of the tool, will reach a predetermined safety limit.
  • An automatic apparatus for carrying out the process of the invention is characterized by the combination of means for gradually varying the weight on the tool, means for reversing the direction of variation of said weight, means for measuring the algebraic value of (dVa/dT) which is the ratio with a changed sign of the variation of the penetration speed of the tool to the corresponding variation of the tensile stress exerted on the drill string at a point thereof, means for setting an upper limit-value and a lower limit-value of said ratio, means for comparing the value of said ratio with said limit-values, said means for comparing being connected to said means for measuring said ratio and to said means for reversing the direction of variation of the weight on the tool and being adapted to initiate a decreasein this weight at the latest when the value of said ratio reaches said lower limit-value and an increase in this weight when the value of said ratio reaches said upper limit value.
  • the apparatus may be provided with means for comparing at least one other drilling parameter, such as the tensile stress of the drill string and the rotation speed of the tool, with a preset safety limit, said means being also connected to said means for reversing the direction of the variation of the weight on the tool, so as to actuate this means when the value of said parameter reaches said safety limit.
  • at least one other drilling parameter such as the tensile stress of the drill string and the rotation speed of the tool
  • FIG. 1 illustrates, in the case of drilling with use of a bottom motor, the law of variation of the bit speed of penetration in terms of the weight applied thereto,
  • FIGS. 2 and 2A diagrammatically show two examples of ap paratus according to the invention
  • FIG. 3 shows, facing each other, a curve of variation of the penetration speed of the bit versus time and the corresponding variation of pressure of the drilling fluid as measured at the surface
  • FIG. 4 shows the law of variation of the ratio (AVa/A T) versus time, when using the process of the invention
  • FIG. 5 shows the corresponding law of variation of the feeding rate of the drill string at the surface
  • FIGS. 6 and 7 respectively show the corresponding variations of the speed of penetration of the drilling tool and of the weight exerted thereon.
  • points M and M represent the respective operating points for these two ground layers whose abscissae correspond to the weight Wf applied on the tool and the ordinates to the corresponding penetration speed through the considered ground layer. It can be seen that, when increasing the weight Wf from the operating point M or M this operating point moving to the right of the figure on any of the two curves, the speed of penetration Va of the tool increases and attains a maximum at point S, (or S the curve portion described by the operating point corresponding to stable operating conditions. Beyond the vertex of the operation curve the operating conditions are unstable and the penetration speed decreases with an increasing weight on the tool until stalling of the bottom motor.
  • the penetration speed of the tool undergoes fluctuations of time variation about an average curve 3. These fluctuations are of a frequency associated with the pulsing rate of the drilling mud circulation pump and cannot be filtered without introducing a time constant which is incompatible with the response time required for an automatic device for optimizing the penetration speed of the drill bit, which device must prevent any possibility of stalling ofthe bit.
  • This inconvenience can be avoided by taking in consideration the average penetration speed of the tool over a time interval equal to the pulsing period of the mud pumps or to a multiple thereof.
  • the instants t,, and t,, which are the limits of such period intervals (FIG. 3) may be selected as being the instants at which the alternating component of the pressure P, of the drilling fluid, as measured at the surface, passes through the value zero, such pressure value oscillating about an average value corresponding to the straight line 4, at the same frequency as the penetration speed, but with a time lag 4: corresponding to the lag between the respective pressures of the drilling fluid at the surface and on the hole bottom.
  • the average penetration speed on the hole bottom between instants t,, and t, is given by the formula wherein (Vd) a is the average value of the linear speed of the drill string as measured at the surface between the two instants under consideration, a the lengthening coefficient of the drill string under the effect of a tensile stress, and T,, and T are the respective tensile stresses to which the drill string is subjected at instant I and instant r,,.
  • FIGS. 2 and 2 A diagrammatically illustrate two optional embodiments of apparatus for carrying out the invention
  • FIG. 2 illustrates the case of a flexible drill string unwound from a storing reel
  • FIG. 2 A the case of a drill string formed of rigid elements.
  • reference 5 indicates the drilling tool suspended from the drill string 7 and driven by the bottom motor 6 consisting, for example, of a drilling turbine fed with hydraulic energy from the surface, reference 8 indicating the bore hole.
  • the drill string is lowered in the bore hole through a handling device which may consist of one or more caterpillar chains carrying jaws or clamping shoes in the case of FIG. 2 and ofa winch 33 with a cable 34 wound thereon and supporting a pulley block 32 in the case of use of rigid drill pipes forming the drill string 7 (FIG. 2 A).
  • This handling device is driven by a motor 10, through an irreversible coupling device 11, which can be engaged or disengaged at will by means of electric signals transmitted through control cable 12.
  • a digital computer in actual time 13 receives the measuring value of the tensile stress T applied to the drill string, which measuring value can be supplied, in the case of the embodiment of FIG. 2, through electric conductors 14, by a device comprising at least one strain gage placed at the lower end of the drill string 7 or at 35, on the dead end of the pulley block 31, at the surface, in the case of embodiment of FIG. 2 A.
  • a device 16 is used for measuring the length L of the drill string suspended from the surface through device 9.
  • This device may consist, for example, of a roller in contact with the drill string 7 and driven in rotation by the linear displacement thereof, said roller driving in turn in rotation the emitter of a synchromechanism well known in the art as Selsyn" and whose receiver, to which it is electrically connected through cable 18, actuates a revolution counter device providing, in the form of a series of electric pulses, a digital measuring value of length L, supplied to computer 13 through cable 19.
  • a synchromechanism well known in the art as Selsyn
  • the feed rate Vd of the drill string, at the surface can be measured by devices 20 and 21, respectively similar to devices 16 and 17, the digital value of said speed being supplied to the digital computer 13 through cable 22.
  • Vd it is preferred to use devices separate from those used for measuring L, so as to determine with a sufficient accuracy the linear speed of the drill string.
  • the value of the elasticity coefficient of the drill string 7 is set up at 23 in the computer and there is also supplied to said computer, through conductor 24, a signal representing the digital value of the alternating component of the pressure Ps of the drilling mud at the surface, this pressure being measured by any suitable pressure sensor not shown in the figure, placed in the mud circuit and supplying a measuring signal filtered through device 25, which keeps only the alternating component of this signal supplied to the computer.
  • the numerical value of a will be preferably measured periodically in the hereunder stated manner, after stopping the drilling operation, the average value of the coefficient a corresponding to the depth reached.
  • This measurement can be effected by raising the drill bit over a few meters and then lowering it again so as to rest it on the well bottom without drilling.
  • V the value of V will be kept positive between instant and instant t when the value of a which is used by the computer 13 is too low since, in such case, the absolute value of the negative term n ar-1 n n1 will be too low for having the right-hand side of equation 1 equal to zero, the value of (Vd) 22 thus being the greater in said right-hand side and resulting in a positive value of V,,)f
  • the absolute value of the negative term will be greater than that of(Vd) 2 and will accordingly result in a negative value of (V 2 determined by the computer 13.
  • the exact value of a, measured in situ for the drilled depth, may be calculated by computer 13, using the fact that if 1,,- and t,,. indicate two instants within the time interval between and t the following relationship is applicable wherein L is the drill string length supported from the surface, T,,- and T are the respective tensile stresses applied to said drill string at instants t e, and t
  • the digital computer 13 is adapted to determine the value of the ratio AVa i: 1 li.-. AT entr nt;
  • the computer 13 determines the values of (Va) (5M and We) $12.. by using s p st n lat ja 7.
  • the ratio (A V /A T) is equal to the ratio (A Va/A W) when the mud flow rate Q is constant and accordingly corresponds substantially, on the operating curve 1 or 2 of FIG. 1, to the slope of the tangent at the operating point M, or M, this slope being equal to zero when the penetration speed attains its maximum value for the considered ground layer.
  • the computer 13 is supplied, by setting up at 29 and 30 respectively, a negative limit-value AVa)'/AT and a positive limit-value A Va) /AT of the calculated ratio (A Va/A T), these two values corresponding respectively to a positive limit-value 0, and a negative limit-value 0 (FIG. 1) of the angle of inclination, with respect to the abscissae axis, of the tangent to the operating curve (1 or 2) at the operating point.
  • the apparatus works as follows the device 9 drives the drill string 7 downwardly with a feed rate higher than the maximum penetration speed (Va max) of the drilling tool 5 (FIG. 5); e.g twice such a speed, which results in an increase of the weight W on the tool and makes the operating point M (or M,) describe the operating curve 1 (or 2) towards the right side of the FIG. 1.
  • the penetration speed Va first increases with the weight W on the tool (FIGS. 6 and 7), reaches a maximum and then decreases, while (A Va/A T) decreases.
  • the computer 13 compares the calculated value of the ratio (A Va/A I) with each of the aforesaid limit-values when this value becomes at instant t (FIG. 4) lower than the negative limit-value A Va)/A T the computer 13 delivers a pulse controlling the disengaging of device 11 and, the device 9 being no longer driven, the displacement of the drill string is stopped (FIG. 5), thereby releasing the load exerted on the tool (FIG. 7) which disengages itself.
  • the operating point M (or M now describes leftwards the operating curve (FIG. 1) and the penetration speed again begins to increase up to a maximum value and then decreases again while (A Va/A T) increases (FIG. 4).
  • the apparatus according to the invention automatically adjusts itself to changes in the nature of the drilled formations. Such changes result in fact in a mere change of operating curve (FIG. 1), point M, being'shifted to M
  • the negative threshold (AVa) /AT being reached later than if the operating point had been kept on curve 1, it results that the weight on the tool increases more, the penetration speed Va attains a greater value and consequently the feed rate Vd, which is controlled by the value 2 Va will increase accordingly, thereby achieving the adaptation to the new ground layer traversed by the drill bit.
  • the adjustment of the feed rate Vd of the drill string might also be achieved by hand, in accordance with the indications read at 27 (FIG. 2).
  • the actuation of the disengaging system the triggering of which was supposed to take place only when the actual operating value of the ratio (A Va/AT) runs past the negative threshold of the calculated value (AVa/AT), will be also triggered, by means of any logical system such as electric circuits of the OR gate type, not only when (AVa/AT) runs past the preselected negative threshold, but also when the weight W on the tool attains a preset maximum value, or if the speed of the turbine falls below a predetermined threshold etc
  • the actuation of the engaging system so as to increase the weight on the tool, may be triggered not only when (AVa/AT) runs past the preselected positive threshold, but also when the weight W on the tool is reduced in a predetermined proportion, or when the running speed of the turbine exceeds a predetermined limit-value and so on In these conditions the triggering of the engaging or the disengaging system is initiated at the latest when (AVa/AT) attains one or the other of said negative or positive threshold (or limit-value
  • a process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa comprising the steps of alternately increasing and decreasing the load on the tool about its optimum value by acting on the tensile stress exerted on the drill string, thereby defining periods of increase and periods of decrease of the ratio (A Va/AT) which is.
  • a Va/AT is determined from average values of the penetration speed Va and tensile stress T over time intervals equal to the pulsing period of the drilling fluid circulation pumps.
  • Automatic apparatus for optimizing the penetration rate of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa, comprising in combination means for progressively varying the weight on the tool, means for reversing the direction of said weight variation, means for measuring the algebraic value of the ratio (A Va/AT) which is, with a changed sign, the ratio between the variation of the penetration speed of the tool and the corresponding variation of the tensile stress exerted on the drill string, means for setting up an upper limit-value and a lower limit-value of said ratio, and means for comparing the value of said ratio with said limit-values, said means for comparing being connected to said means for measuring said ratio and to said means for reversing the direction of variation of the weight on the tool and being adapted to initiate a decrease in this weight at the latest when the value of said ratio attains said lower limit-value and an increase of this weight when said ratio attains said upper limit-value.
  • Apparatus according to claim 3 further comprising means for comparing the value of at least one other drilling parameter with a preset safety limit, said means being also connected to said means for reversing the direction of variation of the weight on the tool, so as to actuate the latter when the value of said parameter attains said limit.
  • a process for controlling the penetration speed of a drilling tool driven by a motor, the torque of which varies in inverse proportion to the running speed, comprising the steps of measuring the penetration speed of the drilling tool detecting a change in said penetration speed;
  • step of controlling the load on the drill tool comprises the steps of alternately increasing the load on the tool until said ratio reaches said prescribed minimum limit and then decreasing the load exerted on the tool until said ratio reaches said prescribed maximum limit.
  • said step of increasing the load on the tool includes the step of driving the drill string downwardly with a feed break greater than the maximum penetrating speed ofthe drilling tool.
  • step of decreasing the load exerted on the tool comprises the step of terminating the displacement of the drill string to thereby release the load on the drill tool.
  • step of controlling the load on said drill tool further includes comparing said ratio with each of said prescribed maximum and minimum limits.
  • step of driving said drill string comprises the step of driving said drill string at a linear speed substantially equal to about twice the penetration speed of the drill tool.
  • An apparatus for controlling the penetration rate of a drilling tool by a motor the torque of which varies inversely with respect to the running speed comprising:
  • sixth means responsive to said fifth means, for maintaining said ratio within prescribed maximum and minimum limits by controlling the load on the drill tool in response to said ratio 13.
  • said means for increasing the load exerted on the drill tool comprises means for driving the drill string downwardly with a feed rate greater than the maximum penetration speed of the drilling tool.
  • said means for decreasing the load exerted on the drill tool comprises means for terminating the displacement of the drill string to therebx release the load on the drill tool.
  • said sixth means includes means for comparing said ratio with each of said prescribed maximum and minimum limits.
  • said driving means comprises means for driving said drill string at a linear speed substantially equal to about twice the penetration speed of said drill tool.
  • said comparing means includes means for comparing the value of at least one other drilling parameter with a preset safety limit. being connected to said displacement terminating means, so as to actuate said terminating means when the value of said parameter attains said limit.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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US30534A 1969-04-30 1970-04-21 Process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and apparatus therefor Expired - Lifetime US3658138A (en)

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JP (1) JPS5025404B1 (enrdf_load_stackoverflow)
BE (1) BE749366A (enrdf_load_stackoverflow)
CA (1) CA927375A (enrdf_load_stackoverflow)
DE (1) DE2021232C3 (enrdf_load_stackoverflow)
FR (1) FR2037007B1 (enrdf_load_stackoverflow)
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US3746102A (en) * 1971-10-22 1973-07-17 Dresser Ind Automatic drilling break alarm and shutdown system
US3872932A (en) * 1973-10-23 1975-03-25 Inst Francais Du Petrole Process and apparatus for automatic drilling
US3907366A (en) * 1974-08-11 1975-09-23 David R Pender Method and apparatus for mining coal or other solids in flooded mines
US4165789A (en) * 1978-06-29 1979-08-28 United States Steel Corporation Drilling optimization searching and control apparatus
US4195699A (en) * 1978-06-29 1980-04-01 United States Steel Corporation Drilling optimization searching and control method
EP0395167A1 (fr) * 1989-04-28 1990-10-31 Nik Smet Dispositif et procédé de réalisation d'un trou de forage dans le sol
RU2122099C1 (ru) * 1996-04-08 1998-11-20 Ткаченко Валентин Петрович Легкая передвижная буровая шлангокабельная установка для бурения скважин большого диаметра на воду
US6050348A (en) * 1997-06-17 2000-04-18 Canrig Drilling Technology Ltd. Drilling method and apparatus
US6186248B1 (en) 1995-12-12 2001-02-13 Boart Longyear Company Closed loop control system for diamond core drilling
US20070256861A1 (en) * 2006-05-05 2007-11-08 Hulick Kent E Bit face orientation control in drilling operations
US20070256863A1 (en) * 2006-05-05 2007-11-08 Hulick Kent E Directional drilling control
US20090107728A1 (en) * 2007-10-31 2009-04-30 Emerson Clifford Gaddis Drilling fluid recovery
US20100098568A1 (en) * 2008-10-16 2010-04-22 Adrian Marica Mud pump systems for wellbore operations
US20100303586A1 (en) * 2009-06-01 2010-12-02 John Benjamin Hankins Pipe stand transfer systems and methods
CN101936128A (zh) * 2010-09-17 2011-01-05 郑州市光力科技发展有限公司 一种矿井用钻机
CN101936132A (zh) * 2010-09-17 2011-01-05 郑州市光力科技发展有限公司 一种矿井用往复钻机
US20110180740A1 (en) * 2008-10-16 2011-07-28 Adrian Marica Poppet valve for pump systems with non-rigid connector to facilitate effective sealing
US20120132467A1 (en) * 2010-11-29 2012-05-31 Firas Zeineddine System and method of strain measurement amplification
US20120217067A1 (en) * 2009-09-21 2012-08-30 Mebane Iii Robert Eugene Systems and methods for improving drilling efficiency
US8827242B2 (en) 2008-10-16 2014-09-09 National Oilwell Varco, L.P. Valve cartridge for pump systems
US8961093B2 (en) 2010-07-23 2015-02-24 National Oilwell Varco, L.P. Drilling rig pipe transfer systems and methods
US9290995B2 (en) 2012-12-07 2016-03-22 Canrig Drilling Technology Ltd. Drill string oscillation methods
US9328729B2 (en) 2008-10-16 2016-05-03 National Oilwell Varco, L.P. Pumping systems with dedicated surge dampeners
US20190047133A1 (en) * 2016-04-06 2019-02-14 Hilti Aktiengesellschaft Application-optimized deactivation behavior of an electronic slipping clutch
US10378282B2 (en) 2017-03-10 2019-08-13 Nabors Drilling Technologies Usa, Inc. Dynamic friction drill string oscillation systems and methods
EP3693534A1 (en) * 2019-02-11 2020-08-12 Sandvik Mining and Construction Oy Determining a length of a drill hole drilled by a continuous rod
CN113123777A (zh) * 2019-12-30 2021-07-16 中铁二局集团有限公司 一种用于隧道塌方救援的大口径钻机钻进过程控制方法

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US4003435A (en) * 1975-10-09 1977-01-18 General Electric Company Method and apparatus for deployment and retrieval of fixed lengths of electrical cable into and from a well bore
US4009754A (en) * 1975-10-09 1977-03-01 General Electric Company Electrical cable feeding and removing apparatus
GB2003769B (en) * 1977-09-09 1982-01-20 Bendix Corp Drill and drill drive mechanism
FR2464218A1 (fr) * 1979-08-27 1981-03-06 France Etat Dispositif de recuperation d'un cable de manutention d'une charge immergee
JPS59125869U (ja) * 1983-02-09 1984-08-24 ソニー株式会社 汎用ラツク
DE3827400A1 (de) * 1988-08-12 1990-02-15 Salzgitter Peine Stahlwerke Verfahren und vorrichtung zum reinigen einer foerderrinne
CN112682023B (zh) * 2020-12-25 2022-05-13 中国铁建重工集团股份有限公司 一种超前钻机控制系统

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Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746102A (en) * 1971-10-22 1973-07-17 Dresser Ind Automatic drilling break alarm and shutdown system
US3872932A (en) * 1973-10-23 1975-03-25 Inst Francais Du Petrole Process and apparatus for automatic drilling
US3907366A (en) * 1974-08-11 1975-09-23 David R Pender Method and apparatus for mining coal or other solids in flooded mines
US4165789A (en) * 1978-06-29 1979-08-28 United States Steel Corporation Drilling optimization searching and control apparatus
US4195699A (en) * 1978-06-29 1980-04-01 United States Steel Corporation Drilling optimization searching and control method
EP0395167A1 (fr) * 1989-04-28 1990-10-31 Nik Smet Dispositif et procédé de réalisation d'un trou de forage dans le sol
BE1002331A3 (nl) * 1989-04-28 1990-12-11 Smet Nik Inrichting en werkwijze voor het maken van een boorgat in de grond.
US6186248B1 (en) 1995-12-12 2001-02-13 Boart Longyear Company Closed loop control system for diamond core drilling
RU2122099C1 (ru) * 1996-04-08 1998-11-20 Ткаченко Валентин Петрович Легкая передвижная буровая шлангокабельная установка для бурения скважин большого диаметра на воду
US6050348A (en) * 1997-06-17 2000-04-18 Canrig Drilling Technology Ltd. Drilling method and apparatus
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CA927375A (en) 1973-05-29
FR2037007A1 (enrdf_load_stackoverflow) 1970-12-31
JPS5025404B1 (enrdf_load_stackoverflow) 1975-08-23
DE2021232B2 (de) 1979-09-27
FR2037007B1 (enrdf_load_stackoverflow) 1973-03-16
DE2021232C3 (de) 1980-06-04
GB1284149A (en) 1972-08-02
NL163595C (nl) 1980-09-15
DE2021232A1 (de) 1970-11-12
NL163595B (nl) 1980-04-15
BE749366A (fr) 1970-10-01
NL7006264A (enrdf_load_stackoverflow) 1970-11-03

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