EP0417263A1 - Control device and process for drilling by vibration analysis. - Google Patents
Control device and process for drilling by vibration analysis.Info
- Publication number
- EP0417263A1 EP0417263A1 EP90906252A EP90906252A EP0417263A1 EP 0417263 A1 EP0417263 A1 EP 0417263A1 EP 90906252 A EP90906252 A EP 90906252A EP 90906252 A EP90906252 A EP 90906252A EP 0417263 A1 EP0417263 A1 EP 0417263A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency band
- drilling
- signal
- cells
- pass filter
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 10
- 238000004458 analytical method Methods 0.000 title description 2
- 230000008569 process Effects 0.000 title description 2
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims abstract description 7
- 230000000007 visual effect Effects 0.000 claims abstract description 4
- 230000003993 interaction Effects 0.000 claims abstract description 3
- 238000001228 spectrum Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000003321 amplification Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
- E21B44/005—Below-ground automatic control systems
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
- E21B12/02—Wear indicators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
Definitions
- the present invention relates to a device for hearing and / or visual representation of the mechanical phenomena of drilling and its use in a method of conducting drilling. It is known from French patent application 1 587 35 a method for measuring the mechanical characteristics of rock during drilling and a device allowing the implementation of said method.
- Such a method makes it possible to know the lithological properties of the rocks attacked by the drilling tool e taking, using an accelerometer, the speed of rotation of the drill pipe and taking using deformation gauges signals corresponding to the vibrational stresses to which the rod is subjected. By processing these signals in analog circuits we obtain a sign which allows, by this process, to know the lithological properties of the rocks attacked by the tool.
- a first object of the invention is to propose a device making it possible, after processing a signal, to deduce information relating to phenomena such as the recovery of the bottom of the drill bit or the jamming then the relaxation by adhesion of the drill bit against the wall, or the rupture of certain teeth of the drill bit or finally the failure to recover the bottom of the drill bit.
- This object is achieved by the fact that the auditory and / or visual representation of the mechanical phenomena of the interaction between a drilling tool and the drilled rock comprises means for collecting by an accelerometric sensor at a point located on the lining of the drilling, a vibratory signal representative of the vibration of the tool on the working face and means of filtering the signal in a frequency band from 10 to 200 Hz.
- the filtered signal is sent to an audio amplifier connected to a headset.
- the filtered signal is sent to a light-emitting diode display device of the bar graph type.
- the filtering means are constituted by identical cells of second order high pass active filter selectively put in series with identical cells with second order low pass active filter to constitute the frequencies of cut off the frequency band.
- the frequency band is from 20 to 200 Hz for a downhole motor.
- the frequency band is from 10 to 100 Hz for a surface motor.
- Another object of the invention is to propose a simple device, easily transportable and usable on a drilling site.
- a final object of the invention is to propose a use of the device in a method of conducting a drilling.
- the use consists of - filtering the signal delivered by an accelerometric sensor to preserve the spectrum included in the frequency band from 10 to 200 Hz;
- FIG. 1 shows an overall device diagram mounted on a drilling rig
- FIG. 2 shows the block diagram of the electronic pre-amplification circuit
- FIG. 3 shows the diagram of the filtra circuit of the invention
- FIG. 4 shows a view of the front face of the apparatus of the invention.
- FIG. 1 there is shown in (1) a drilling derrick, in (2) the upper part of the derrick carried the set of fixed pulleys (3).
- This series of pulleys (3) is connected to the block carrying the set of movable pulleys (5) by set of cables (4).
- To this block (5) is fixed a hook (which supports an injection head (7).
- the upper part of this injection head (7) is fixed while the lower part is movable in rotation by means of bearing system: an injection hose (8) is connected on the one hand to the injection head (7) and, on the other hand, all the slurry pumps not shown in the drawing.
- rotary drive (9) of the drill string is shown in square form and in the following will simply call it a square rod. This rod (9) is rotated by the rotation table (10) itself driven by a motor not shown.
- the reference (11) schematically represents a wellbore into which the drill string (12) penetrates.
- This drill string (12) is provided at its lower part with a drilling tool (20).
- a measuring device (13) is interposed between the injection head and the square rod.
- this device (13) can be fixed on the injection head (7).
- This measuring device (13) is connected by a cable (14) to the device (45) allowing the processing of electrical graders.
- the measuring device consists of an accelerometric sensor (140) which transforms the variations in acceleration from the end of the rod into an analog electrical signal.
- This analog electrical signal is processed by the processing device (45) of Figure 4, consisting of an amplification circuit, shown in Figure 2, a filtering circuit shown in Figure 3, again from a preamplification (47, 470) of the filtered signal to then exit on a conventional audio amplifier (46) allowing listening to the signal thus obtained.
- the signal delivered by the sensor (140) is sent to the input of an amplifier whose loopback resistance of the output on the input can be modified by a rotary contact (40) which makes it possible to selectively relate one of the resistors (400, 401, 402, 403) between the output and the input of the amplifier (404).
- a second amplifier (41) includes in its loop-back circuit a variable resistor (410) which makes it possible to carry out fine adjustment within the selected amplification range.
- the output signal of the amplifier (41) is sent, on the one hand to the input of the filtering circuit of FIG. 3 and on the other hand, via a peak detector circuit (420) on the display (42) of FIG. 4.
- the output signal of the amplifier (41) is sent via a rectifier circuit (43) and an integrator circuit (44) ve an output (S2) of the measuring device.
- the signal arrives at the input (30) of a set of filters constituted by cells of low-pass active filters of the second order (31 31b) followed by four cells of active high-pass filters of the second order (32a, 32b, 32c , 32d) and two second-order active low-pass filter cells (31c, 31d).
- These filters can be connected in series with each other or be short-circuited totally or partially depending on the position of the rotary contact buttons (490, 491).
- the output (33) of the filtering circuit is sent to the input of a second preamplification circuit (47, 470.48) of the same type as that described in FIG. 2.
- This second preamplification circuit sends its output signal supplied by the output the amplifier (470) to an amplification circuit aud (46) of conventional constitution well known to those skilled in the art for delivering on a headphone jack the sign resulting from the processing of the invention and making it possible to follow the evolution of drilling.
- Each second order low pass filter cell e constituted in the same way as the cell (31a) and comprises two resistors (310, 311) connected in series to the negative input of a differential amplifier (313), the positive input is connected by a resistor (312) to ground.
- the point common to the two resistors (310, 311) is connected on the one hand by the capacitor (316) to ground and, on the other hand by a resistor (315) at the output of the amplifier (313).
- the output of the amplifier (313) is also connected by a capacitor (314) to the negative input of this amplifier (313).
- Each high-pass filter cell is constituted in the same way as the cell (32a) and comprises two condensers (320, 321) connected in series and connected to the negative input of differential amplifier (323) whose positive input e connected by a resistor (322) to ground.
- the point common to the two capacitors (320, 321) is connected, on the one hand by a resistor (326) to ground, and on the other hand by a capacitor (325) at the output of the amplifier (323).
- the output of the amplifier (323) is also connected by a resistor (324) to the input of the differential amplifier (323).
- the filter thus constituted by a succession of cells (31a to 31d) and (32a to 32d) makes it possible to filter the signal delivered by the preamp in the frequency band from 10 to 200 Hz according to the positions taken by the buttons of the rotary contacts ( 490, 491)
- the corresponding contact (490 C) When the button (490) is in the position (490c, fig4), the corresponding contact (490 C) is closed and connects the cell inlet (32a) to the cell outlet (32c), thus short-circuiting cells (32a to 32c) and thus maintaining the high pass filter (32d) in the circuit.
- This filter (32d) has its resistive and capacitive elements calculated to establish the cutoff frequency at 10 Hz.
- the button (490, fig 4) When the button (490, fig 4) is in the position (490b, fig 4) the corresponding contact (490B, fig 3) is closed and connects the input of the cell (32a) to the output of the cell (32b) thus short-circuiting the cells (32a) and (32b).
- the resistive and capacitive elements of the cell (32c) are calculated so that the two cells (32c, 32d) put in series have a cutoff frequency of 20 Hz.
- the button (490) When the button (490) is in the position (490a, fig 4) the corresponding contact (490A) connects the input of the cell (32a) to its output.
- the cells (32b) to (32d) are in series and the resistive and capacitive elements of the cell (32b) are calculated to establish the cutoff frequency of the set of three cells in series at 30 Hz.
- the button (491) By pressing the button (491) it is possible to select the low-pass filter cells introduced into the filtering circuit.
- the button (491) When the button (491) is in position (491abc) the cells (31a) and (31b) are short-circuited by the closed contact (491 AB) connecting the cell input (31a) to the output of (31b) and the cell (31c) e also short-circuited by the closed contact (491C) connected the input of (31c) to its output.
- the capacitive resistive elements of the cell (31d) are calculated to establish the cutoff frequency at 200 Hz.
- the button (491) is on the positi (491abcd) the contacts (491AB) and (491CD) are closed all the cells (31a) to (31d) are short-circuited.
- the signal thus filtered is then transmitted to a second preamp and to an audio amplifier making it possible to deliver an audio signal to a headphone jack.
- the listening or viewing device is provided with an autonomous battery supply.
- the signal delivered in the frequency band from 10 to 200 Hz makes it possible to detect by listening the anomalies which can occur during drilling. Surprisingly, it has been found that the signal thus filtered eliminates all the other noises due to drilling, such as for example the noises of mud, and retains only the noises corresponding to the contact of the drill bit with the drilling.
Abstract
Dispositif de représentation auditive et/ou visuelle des phénomènes mécaniques de l'interaction entre un outil de forage et la roche forée, caractérisé en ce qu'il comporte des moyens de recueillir par un capteur accélérométrique en un point localisé sur la garniture de forage, un signal vibratoire représentatif de la vibration de l'outil sur le front de taille, des moyens (45, 31, 32) de filtrer le signal dans une bande de fréquence de 10 à 200 Hz.Device for auditory and / or visual representation of the mechanical phenomena of the interaction between a drilling tool and the drilled rock, characterized in that it comprises means for collecting by an accelerometric sensor at a point located on the drill string, a vibratory signal representative of the vibration of the tool on the working face, means (45, 31, 32) for filtering the signal in a frequency band of 10 to 200 Hz.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90906252T ATE102289T1 (en) | 1989-03-31 | 1990-03-30 | DEVICE AND METHOD FOR CONTROLLING A HOLE BY ANALYZING THE VIBRATIONS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8904234A FR2645205B1 (en) | 1989-03-31 | 1989-03-31 | DEVICE FOR AUDITIVE AND / OR VISUAL REPRESENTATION OF MECHANICAL PHENOMENAS IN A WELL AND USE OF THE DEVICE IN A METHOD OF CONDUCTING A WELL |
FR8904234 | 1989-03-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0417263A1 true EP0417263A1 (en) | 1991-03-20 |
EP0417263B1 EP0417263B1 (en) | 1994-03-02 |
Family
ID=9380245
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90906252A Expired - Lifetime EP0417263B1 (en) | 1989-03-31 | 1990-03-30 | Control device and process for drilling by vibration analysis |
Country Status (9)
Country | Link |
---|---|
US (1) | US5141061A (en) |
EP (1) | EP0417263B1 (en) |
JP (1) | JP2718822B2 (en) |
CA (1) | CA2030520C (en) |
DE (1) | DE69006986T2 (en) |
FR (1) | FR2645205B1 (en) |
NO (1) | NO300744B1 (en) |
OA (1) | OA09275A (en) |
WO (1) | WO1990012195A1 (en) |
Families Citing this family (42)
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---|---|---|---|---|
US5248857A (en) * | 1990-04-27 | 1993-09-28 | Compagnie Generale De Geophysique | Apparatus for the acquisition of a seismic signal transmitted by a rotating drill bit |
FR2673237B1 (en) * | 1991-02-25 | 1999-02-26 | Elf Aquitaine | METHOD FOR AUTOMATICALLY MONITORING THE VIBRATORY CONDITION OF A BORE LINING. |
JPH0538610A (en) * | 1991-08-06 | 1993-02-19 | Nec Corp | Inspection of multilayer printed wiring board |
US5321981A (en) * | 1993-02-01 | 1994-06-21 | Baker Hughes Incorporated | Methods for analysis of drillstring vibration using torsionally induced frequency modulation |
NO940209D0 (en) * | 1993-02-19 | 1994-01-20 | Baker Hughes Inc | Procedure and apparatus for detecting drill bits |
US5679894A (en) * | 1993-05-12 | 1997-10-21 | Baker Hughes Incorporated | Apparatus and method for drilling boreholes |
US5358059A (en) * | 1993-09-27 | 1994-10-25 | Ho Hwa Shan | Apparatus and method for the dynamic measurement of a drill string employed in drilling |
US5705747A (en) * | 1995-01-13 | 1998-01-06 | Henry Filters, Inc. | Methods and system for scaleable liquid display and control |
FR2750160B1 (en) * | 1996-06-24 | 1998-08-07 | Inst Francais Du Petrole | METHOD AND SYSTEM FOR REAL-TIME ESTIMATION OF AT LEAST ONE PARAMETER RELATED TO THE MOVEMENT OF A DRILLING TOOL |
FR2750159B1 (en) * | 1996-06-24 | 1998-08-07 | Inst Francais Du Petrole | METHOD AND SYSTEM FOR REAL-TIME ESTIMATION OF AT LEAST ONE PARAMETER RELATED TO THE BEHAVIOR OF A DOWNHOLE TOOL |
US6196335B1 (en) * | 1998-06-29 | 2001-03-06 | Dresser Industries, Inc. | Enhancement of drill bit seismics through selection of events monitored at the drill bit |
GB9824248D0 (en) | 1998-11-06 | 1998-12-30 | Camco Int Uk Ltd | Methods and apparatus for detecting torsional vibration in a downhole assembly |
CA2351176C (en) * | 1998-12-12 | 2009-02-24 | Dresser Industries, Inc. | Apparatus for measuring downhole drilling efficiency parameters |
FR2792363B1 (en) | 1999-04-19 | 2001-06-01 | Inst Francais Du Petrole | METHOD AND SYSTEM FOR DETECTING THE LONGITUDINAL MOVEMENT OF A DRILLING TOOL |
US6459263B2 (en) | 2000-02-08 | 2002-10-01 | Baker Hughes Incorporated | Nuclear magnetic resonance measurements in well logging using motion triggered pulsing |
US6634441B2 (en) | 2000-08-21 | 2003-10-21 | Halliburton Energy Services, Inc. | System and method for detecting roller bit bearing wear through cessation of roller element rotation |
US6631772B2 (en) | 2000-08-21 | 2003-10-14 | Halliburton Energy Services, Inc. | Roller bit rearing wear detection system and method |
US6681633B2 (en) * | 2000-11-07 | 2004-01-27 | Halliburton Energy Services, Inc. | Spectral power ratio method and system for detecting drill bit failure and signaling surface operator |
US6722450B2 (en) | 2000-11-07 | 2004-04-20 | Halliburton Energy Svcs. Inc. | Adaptive filter prediction method and system for detecting drill bit failure and signaling surface operator |
US6712160B1 (en) | 2000-11-07 | 2004-03-30 | Halliburton Energy Services Inc. | Leadless sub assembly for downhole detection system |
US6648082B2 (en) | 2000-11-07 | 2003-11-18 | Halliburton Energy Services, Inc. | Differential sensor measurement method and apparatus to detect a drill bit failure and signal surface operator |
US7357197B2 (en) | 2000-11-07 | 2008-04-15 | Halliburton Energy Services, Inc. | Method and apparatus for monitoring the condition of a downhole drill bit, and communicating the condition to the surface |
US6817425B2 (en) | 2000-11-07 | 2004-11-16 | Halliburton Energy Serv Inc | Mean strain ratio analysis method and system for detecting drill bit failure and signaling surface operator |
GB2374931B (en) * | 2001-04-24 | 2003-09-24 | Fmc Technologies | Acoustic monitoring system for subsea wellhead tools and downhole equipment |
US9745799B2 (en) | 2001-08-19 | 2017-08-29 | Smart Drilling And Completion, Inc. | Mud motor assembly |
US9051781B2 (en) | 2009-08-13 | 2015-06-09 | Smart Drilling And Completion, Inc. | Mud motor assembly |
SE0302625L (en) * | 2003-10-06 | 2004-09-28 | Atlas Copco Rock Drills Ab | Detection of loosening of threaded joints |
US7357030B2 (en) * | 2004-11-11 | 2008-04-15 | Battelle Energy Alliance, Llc | Apparatus and methods for determining at least one characteristic of a proximate environment |
US20070215384A1 (en) * | 2006-02-17 | 2007-09-20 | James Ingerslew | Drilling apparatus and method |
MX2008015701A (en) * | 2006-06-09 | 2009-02-20 | Univ Aberdeen | Resonance enhanced drilling: method and apparatus. |
JP2008006532A (en) * | 2006-06-29 | 2008-01-17 | Mitsubishi Heavy Ind Ltd | Deep hole drilling device |
WO2009145897A1 (en) * | 2008-05-29 | 2009-12-03 | Lucon Peter A | Automatic control of oscillatory penetration apparatus |
US8453764B2 (en) | 2010-02-01 | 2013-06-04 | Aps Technology, Inc. | System and method for monitoring and controlling underground drilling |
US9234974B2 (en) | 2011-09-26 | 2016-01-12 | Saudi Arabian Oil Company | Apparatus for evaluating rock properties while drilling using drilling rig-mounted acoustic sensors |
US9903974B2 (en) | 2011-09-26 | 2018-02-27 | Saudi Arabian Oil Company | Apparatus, computer readable medium, and program code for evaluating rock properties while drilling using downhole acoustic sensors and telemetry system |
US9074467B2 (en) * | 2011-09-26 | 2015-07-07 | Saudi Arabian Oil Company | Methods for evaluating rock properties while drilling using drilling rig-mounted acoustic sensors |
US10551516B2 (en) | 2011-09-26 | 2020-02-04 | Saudi Arabian Oil Company | Apparatus and methods of evaluating rock properties while drilling using acoustic sensors installed in the drilling fluid circulation system of a drilling rig |
US9447681B2 (en) | 2011-09-26 | 2016-09-20 | Saudi Arabian Oil Company | Apparatus, program product, and methods of evaluating rock properties while drilling using downhole acoustic sensors and a downhole broadband transmitting system |
US10180061B2 (en) | 2011-09-26 | 2019-01-15 | Saudi Arabian Oil Company | Methods of evaluating rock properties while drilling using downhole acoustic sensors and a downhole broadband transmitting system |
US9624768B2 (en) | 2011-09-26 | 2017-04-18 | Saudi Arabian Oil Company | Methods of evaluating rock properties while drilling using downhole acoustic sensors and telemetry system |
USD843381S1 (en) | 2013-07-15 | 2019-03-19 | Aps Technology, Inc. | Display screen or portion thereof with a graphical user interface for analyzing and presenting drilling data |
US10472944B2 (en) | 2013-09-25 | 2019-11-12 | Aps Technology, Inc. | Drilling system and associated system and method for monitoring, controlling, and predicting vibration in an underground drilling operation |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
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FR1587350A (en) * | 1968-03-22 | 1970-03-20 | ||
FR1590327A (en) * | 1968-10-30 | 1970-04-13 | ||
US3626482A (en) * | 1968-10-30 | 1971-12-07 | Aquitaine Petrole | Method and apparatus for measuring lithological characteristics of rocks |
FR96617E (en) * | 1968-12-11 | 1973-07-20 | Aquitaine Petrole | Instant logging while drilling method and implementation device. |
US3520375A (en) * | 1969-03-19 | 1970-07-14 | Aquitaine Petrole | Method and apparatus for measuring mechanical characteristics of rocks while they are being drilled |
FR2067613A5 (en) * | 1969-11-12 | 1971-08-20 | Aquitaine Petrole | |
US3703096A (en) * | 1970-12-28 | 1972-11-21 | Chevron Res | Method of determining downhole occurrences in well drilling using rotary torque oscillation measurements |
USRE28436E (en) * | 1970-12-28 | 1975-06-03 | Method op determining downhole occurences in well drilling using rotary torque oscillation measurements | |
US4150568A (en) * | 1978-03-28 | 1979-04-24 | General Electric Company | Apparatus and method for down hole vibration spectrum analysis |
GB2179736B (en) * | 1985-08-30 | 1989-10-18 | Prad Res & Dev Nv | Method of analyzing vibrations from a drilling bit in a borehole |
US4715451A (en) * | 1986-09-17 | 1987-12-29 | Atlantic Richfield Company | Measuring drillstem loading and behavior |
GB2217012B (en) * | 1988-04-05 | 1992-03-25 | Forex Neptune Sa | Method of determining drill bit wear |
-
1989
- 1989-03-31 FR FR8904234A patent/FR2645205B1/en not_active Expired - Fee Related
-
1990
- 1990-03-30 EP EP90906252A patent/EP0417263B1/en not_active Expired - Lifetime
- 1990-03-30 WO PCT/FR1990/000220 patent/WO1990012195A1/en active IP Right Grant
- 1990-03-30 CA CA002030520A patent/CA2030520C/en not_active Expired - Lifetime
- 1990-03-30 DE DE69006986T patent/DE69006986T2/en not_active Expired - Fee Related
- 1990-03-30 JP JP2506336A patent/JP2718822B2/en not_active Expired - Lifetime
- 1990-03-30 US US07/613,639 patent/US5141061A/en not_active Expired - Lifetime
- 1990-11-26 NO NO905098A patent/NO300744B1/en not_active IP Right Cessation
- 1990-11-30 OA OA59907A patent/OA09275A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9012195A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5141061A (en) | 1992-08-25 |
DE69006986T2 (en) | 1994-09-08 |
NO300744B1 (en) | 1997-07-14 |
DE69006986D1 (en) | 1994-04-07 |
JPH03505110A (en) | 1991-11-07 |
FR2645205B1 (en) | 1991-06-07 |
EP0417263B1 (en) | 1994-03-02 |
FR2645205A1 (en) | 1990-10-05 |
CA2030520C (en) | 1997-11-18 |
JP2718822B2 (en) | 1998-02-25 |
WO1990012195A1 (en) | 1990-10-18 |
OA09275A (en) | 1992-08-31 |
NO905098D0 (en) | 1990-11-26 |
NO905098L (en) | 1991-01-22 |
CA2030520A1 (en) | 1990-10-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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