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WO1991018262A1 - Method for measuring the azimuth of a drillhole - Google Patents

Method for measuring the azimuth of a drillhole Download PDF

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Publication number
WO1991018262A1
WO1991018262A1 PCT/DE1991/000397 DE9100397W WO9118262A1 WO 1991018262 A1 WO1991018262 A1 WO 1991018262A1 DE 9100397 W DE9100397 W DE 9100397W WO 9118262 A1 WO9118262 A1 WO 9118262A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring method
earth
borehole
sensor
cable
Prior art date
Application number
PCT/DE1991/000397
Other languages
German (de)
French (fr)
Inventor
Harry Jonckers
Original Assignee
Harry Jonckers
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
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Application filed by Harry Jonckers filed Critical Harry Jonckers
Publication of WO1991018262A1 publication Critical patent/WO1991018262A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
    • G01C17/02—Magnetic compasses
    • G01C17/28—Electromagnetic compasses
    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/02—Determining slope or direction
    • E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism

Definitions

  • the invention relates to a Bohrlochmeß ⁇ method according to the preamble of the main claim.
  • Azimuth of a borehole course is known, for example a high-precision compass being built into a measuring probe and recorded photographically after a preset time.
  • the determined data are only available when the film is developed - that is, at the end of the measurement - and must then go through an interpretation and interpolation process.
  • These processes are very labor intensive (company brochure of INTERFELS-EASTMAN INSTRUMENTS GmbH, Bad Benthei: "SINGLE-SHOT INSTRUMENT TYPE EK with electronic timer or motion sensor", 1983).
  • the object of the invention is to create a reliable method which works with inexpensive sensors.
  • a magnetic field sensor be arranged to rotate about the longitudinal axis of the device and be lowered into the borehole.
  • This rotating magnetic field sensor which can be manufactured relatively inexpensively, delivers a signal induced by the earth's magnetism.
  • this signal is a sine line, the sinusoidal signal reaching an extreme value when the magnetic field sensor passes through the earth's magnetism line.
  • the angle of rotation between the rotating sensor and the inclination planes of the inclinometer permanently installed in the device is detected with the aid of an optical coding system, that is to say, for example, a disk having holes provided with the sensor and rotating at a certain distance from one another is illuminated , whereby the transmitted light beam emits an electrical trical impulse generated.
  • These recorded data are passed over a borehole cable to the earth's surface, where they are preferably a computer-aided mathematical. Model 1 ation are fed.
  • a highly precise angle determination based on the magnetic north is calculated from the signal with errors.
  • the errors that occur such as magnetic interference fields of the motor, temperature dependency of the sensor or circuit, fluctuations in the rotational speed and signal dependency on the intensity of the magnetic field are compensated for by the computer-aided calculation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Geology (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The invention concerns a drillhole measurement method using a probe held by a cable, the angle of tilt of the longitudinal axis of the probe being measured by a two-axis inclinometer. The geographical direction of the inclination is determined by a rotatable magnetic-field sensor mounted to rotate about the longitudinal axis of the instrument, thus producing a signal induced by the Earth's local magnetic field. This signal is fed through a cable to the surface of the Earth where modern computer-based statistical methods are used to produce highly accurate results.

Description

"Bohrlochmeßverfahren zur Bestimmung des Azimuts des Bohrlochverlaufes" "Borehole measurement method for determining the azimuth of the borehole course"
Die Erfindung bezieht sich auf ein Bohrlochme߬ verfahren gemäß dem Oberbegriff des Hauptanspru¬ ches .The invention relates to a Bohrlochme߬ method according to the preamble of the main claim.
In der Praxis sind Verfahren zur Bestimmung desIn practice, procedures for determining the
Azimuts eines Bohrlochverlaufes bekannt, wobei bei¬ spielsweise ein hochgenauer Kompaß in eine Meßsonde eingebaut und nach einer voreingestellten Zeit foto¬ graphisch registriert wird. Die ermittelten Daten stehen leider erst bei der Entwicklung des Filmes - also am Ende der Messung - zur Verfügung und müssen dann noch einen Interpretati ons- und Inter¬ polationsprozeß durchlaufen. Diese Prozesse sind sehr arbeitsintensiv (Firmendruckschrift der INTERFELS-EASTMAN INSTRUMENTS GmbH, Bad Benthei : "SINGLE-SHOT INSTRUMENT TYPE EK mit ele tronischem Timer oder Motion-Sensor", 1983) .Azimuth of a borehole course is known, for example a high-precision compass being built into a measuring probe and recorded photographically after a preset time. Unfortunately, the determined data are only available when the film is developed - that is, at the end of the measurement - and must then go through an interpretation and interpolation process. These processes are very labor intensive (company brochure of INTERFELS-EASTMAN INSTRUMENTS GmbH, Bad Benthei: "SINGLE-SHOT INSTRUMENT TYPE EK with electronic timer or motion sensor", 1983).
Es existieren auch Spulensysteme, welche auf elek- tronische Art ein eindeutiges Richtungssignal pro- duzieren. Solche Systeme sind aber entweder sehr¬ störanfällig oder sehr teuer und daher für bestimmte praktische Verhältnisse nicht zufriedenstellend (Firmendruckschrift der INTERFELS-EASTMAN INSTRUMENTS GmbH, Bad Bentheim: "DIGI COURSE I", 1983; Zeitschrift " ireless Word", Oktober 1982, Seite 49 - 54) .There are also coil systems that electronically produce a clear directional signal. reduce. However, such systems are either very susceptible to faults or very expensive and are therefore unsatisfactory for certain practical conditions (company publication of INTERFELS-EASTMAN INSTRUMENTS GmbH, Bad Bentheim: "DIGI COURSE I", 1983; magazine "ireless Word", October 1982, page 49 - 54).
Der Erfindung liegt die Aufgabe zugrunde, ein zuver- lässiges und mit preiswerten Sensoren arbeitendes Verfahren zu schaffen.The object of the invention is to create a reliable method which works with inexpensive sensors.
Diese der Erfindung zugrundeliegende Aufgabe wird durch die Lehre des Hauptanspruches gelöst.This object on which the invention is based is achieved by the teaching of the main claim.
Mit anderen Worten ausgedrückt wird vorgeschlagen, daß ein Magnetfeldsensor um die Gerätelängsachse rotierend angeordnet ist und in das Bohrloch hinab¬ gelassen wird. Dieser rotierende Magnetfeldsensor, der relativ preiswert hergestellt werden kann, lie¬ fert dabei ein durch den vorhandenen Erdmagnetismus induziertes Signal .In other words, it is proposed that a magnetic field sensor be arranged to rotate about the longitudinal axis of the device and be lowered into the borehole. This rotating magnetic field sensor, which can be manufactured relatively inexpensively, delivers a signal induced by the earth's magnetism.
Dieses Signal ist bei einer Drehung des Sensors eine Sinuslinie, wobei das sinusförmige Signal einen Ex¬ tremwert erreicht, wenn der Magnetfeldsensor die Erdmagnetismuslinie durchläuft.When the sensor rotates, this signal is a sine line, the sinusoidal signal reaching an extreme value when the magnetic field sensor passes through the earth's magnetism line.
Der Verdrehwinkel zwischen dem rotierenden Sensor und den Neigungsebenen des im Gerät fest eingebauten Inkl i nometers wird mit Hilfe eines optischen Kodier- systemes erfaßt, d. h. z. B. eine sich mit dem Sensor drehende im bestimmten Abstand voneinander vorge¬ sehene Löcher aufweisende Scheibe wird durchleuch- tet, wobei der durchfallende Lichtstrahl einen elek- trischen Impuls erzeugt. Dieses optische Kodier¬ system hat eine Auflösung von z. B. 500 Schritten, d. h. 500 Löchern auf der sich drehenden Scheibe, so daß eine rein statische Auflösung von 360/500 = 0,7° gegeben ist. Diese erfaßten Daten werden über ein Bohrlochkabel zur Erdoberfläche geleitet, wo sie vorzugsweise einer rechnerunterstützten mathemati¬ schen . Model 1 ierung zugeführt werden. Hier wird aus dem mit Fehlern behafteten Signal eine hochgenaue Winkelbestimmung bezogen auf den magnetischen Nor¬ den errechnet. Die auftretenden Fehler, wie mag¬ netische Störfelder des Motors, Temperaturabhängig¬ keit von Sensor oder Schaltung, Schwankungen in der Drehgeschwindigkeit und Signal abhängi gkei t von der Intensität des Magnetfeldes werden durch die rechnerunterstützte Berechnung ausgeglichen.The angle of rotation between the rotating sensor and the inclination planes of the inclinometer permanently installed in the device is detected with the aid of an optical coding system, that is to say, for example, a disk having holes provided with the sensor and rotating at a certain distance from one another is illuminated , whereby the transmitted light beam emits an electrical trical impulse generated. This optical coding system has a resolution of z. B. 500 steps, ie 500 holes on the rotating disc, so that a purely static resolution of 360/500 = 0.7 ° is given. These recorded data are passed over a borehole cable to the earth's surface, where they are preferably a computer-aided mathematical. Model 1 ation are fed. Here, a highly precise angle determination based on the magnetic north is calculated from the signal with errors. The errors that occur, such as magnetic interference fields of the motor, temperature dependency of the sensor or circuit, fluctuations in the rotational speed and signal dependency on the intensity of the magnetic field are compensated for by the computer-aided calculation.
Da der Meßvorgang beliebig oft wiederholt werden kann, ist im Prinzip jeder Grad von Genauigkeit er- reichbar. Der Kompromiß ist die Meßdauer. So sind innerhalb weniger Sekunden schon Genauigkeiten von ca. 0,1° erreichbar.Since the measuring process can be repeated any number of times, in principle any degree of accuracy can be achieved. The compromise is the measuring time. Accuracies of approx. 0.1 ° can be achieved within a few seconds.
Mit rein analogen Hilfsmitteln wäre ein solches Sig- nal nicht verwertbar, wenn hohe Qualitätsansprüche gestellt werden. Der erfindungsgemäße Vorschlag er¬ möglicht aber das Signal statistisch zu bearbeiten, weil eben durch die dynamische Abtastung eine Viel¬ zahl von Daten zur Verfügung steht. Such a signal would not be usable with purely analogue aids if high quality standards were set. However, the proposal according to the invention enables the signal to be processed statistically, because a large number of data is available due to the dynamic scanning.

Claims

Patentansprüche : Claims:
1. Bohrlochmeßverfahren mit einer von einem Kabel gehaltenen Sonde, wobei die Sonde eine Längsachse hat, deren Neigung von der Verti¬ kalen mit Hilfe eines zweiachsigen Inklino- meters gemessen wird, dadurch gekennzeich¬ net, daß die geographische Richtung der Nei¬ gung mit einem drehbaren Magnetfeldsensor er- faßt wird, der um die Gerätelängsachse ro¬ tierend angeordnet ist und dabei ein durch den vorhandenen Erdmagnetismus induziertes Signal liefert, das über ein Bohrlochkabel zur Erdoberfläche geleitet wird.1. Borehole measuring method with a probe held by a cable, the probe having a longitudinal axis, the inclination of which is measured from the vertical with the aid of a two-axis inclinometer, characterized in that the geographical direction of the inclination is measured with a rotatable magnetic field sensor is detected, which is arranged rotatably about the longitudinal axis of the device and thereby delivers a signal induced by the existing earth magnetism, which is conducted via a borehole cable to the earth's surface.
2. Bohrlochmeßverfahren nach Anspruch 1, da¬ durch gekennzeichnet, daß die über ein Bohr¬ lochkabel zur Erdoberfl che geleiteten, durch den Erdmagnetismus induzierten Signale einer rechnergestützten mathematisch- statisti¬ schen Modellierung zugeführt werden.2. Borehole measuring method according to claim 1, characterized in that the surface, which is guided via a borehole cable to the surface of the earth and is induced by the earth's magnetism, is fed to a computer-aided mathematical-statistical modeling.
3. Bohrlochmeßverfahren nach Anspruch 1, da¬ durch gekennzeichnet, daß der Verdrehwinkel zwischen dem rotierenden Sensor und den Nei¬ gungsebenen des Inkl inometers mit Hilfe eines optischen ( incre ental en oder absoluten) Ko¬ diersystems erfaßt wird.3. Borehole measuring method according to claim 1, characterized in that the angle of rotation between the rotating sensor and the inclination planes of the inclinometer is detected with the aid of an optical (incre ental or absolute) coding system.
4. Bohrlochmeßverfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß das optische Ko¬ diersystem aus einer mit dem rotierenden Sen¬ sor umlaufenden Scheibe besteht, die Licht- durchtri ttsöffnungen aufweist und der durch- tretende Lichtstrahl elektrische Impulse er- zeugt, die zur Erdoberfl che geleitet werden.4. Borehole measuring method according to claim 1 to 3, characterized in that the optical coding system consists of a disc rotating with the rotating sensor, which has light openings and the light beam passing through it generates electrical pulses. testifies to the earth's surface.
Meßverfahren wenigstens nach Anspruch 4, da¬ durch gekennzeichnet, daß das Kodiersystem eine Auflösung von z. B. 500 Sc _hritten auf- weist, so daß eine rein statische Auflösung von 360/500 = ca. 0,7° gegeben ist.Measuring method at least according to claim 4, characterized in that the coding system has a resolution of z. B. 500 Sc _hritten-, so that a purely static resolution of 360/500 = about 0.7 ° is given.
Meßverfahren nach einem oder mehreren derMeasuring method according to one or more of the
10 vorhergehenden Ansprüche, dadurch gekennzeich¬ net, daß die Winkelmessung über eine genaue Zeitmessung erfolgt, wenn die Drehgeschwin¬ digkeit des Sensors konstant ist.10 preceding claims, characterized gekennzeich¬ net that the angle measurement is carried out over an accurate time measurement when the speed of rotation of the sensor is constant.
15 Meßverfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekenn¬ zeichnet, daß der rotierende Magnetfeldsensor nur hin- und hergehende Rotationsbewegungen um eine Position, welche für die Azimutbe¬15 measuring method according to one or more of the preceding claims, characterized gekenn¬ characterized in that the rotating magnetic field sensor only reciprocating rotational movements about a position which for the Azimutbe¬
20 stimmung ausreichend ist, z. B. in der das maximale, vom lokalen Erdmagnetismus indu¬ zierte Signal geliefert wird, ausführt. 20 mood is sufficient, for. B. in which the maximum signal induced by the local earth magnetism is delivered.
PCT/DE1991/000397 1990-05-22 1991-05-16 Method for measuring the azimuth of a drillhole WO1991018262A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4016437.3 1990-05-22
DE19904016437 DE4016437C2 (en) 1990-05-22 1990-05-22 Borehole measurement method for determining the azimuth of the borehole course

Publications (1)

Publication Number Publication Date
WO1991018262A1 true WO1991018262A1 (en) 1991-11-28

Family

ID=6406937

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1991/000397 WO1991018262A1 (en) 1990-05-22 1991-05-16 Method for measuring the azimuth of a drillhole

Country Status (3)

Country Link
EP (1) EP0484487A1 (en)
DE (1) DE4016437C2 (en)
WO (1) WO1991018262A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPO062296A0 (en) * 1996-06-25 1996-07-18 Gray, Ian A system for directional control of drilling
RU2184228C2 (en) * 2000-07-17 2002-06-27 Томский политехнический университет Gyroscopic gear for turn of down-hole logging instrument
RU2187637C2 (en) * 2000-08-14 2002-08-20 Ижевский механический завод Method of guidance of drill string to deposit by azimuth

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397358A (en) * 1964-04-27 1968-08-13 Ass Elect Ind Rotating coil magnetometer with means to compensate for variations in rotational speed
DE2109385A1 (en) * 1971-02-27 1972-09-07 Texaco Development Corp Borehole logging using magnetic fields
US4174577A (en) * 1978-05-09 1979-11-20 Harnessed Energies, Inc. Borehole drift-direction probe
GB2090662A (en) * 1981-01-07 1982-07-14 Robophone Holdings Ltd Navigational equipment for a vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397358A (en) * 1964-04-27 1968-08-13 Ass Elect Ind Rotating coil magnetometer with means to compensate for variations in rotational speed
DE2109385A1 (en) * 1971-02-27 1972-09-07 Texaco Development Corp Borehole logging using magnetic fields
US4174577A (en) * 1978-05-09 1979-11-20 Harnessed Energies, Inc. Borehole drift-direction probe
GB2090662A (en) * 1981-01-07 1982-07-14 Robophone Holdings Ltd Navigational equipment for a vehicle

Also Published As

Publication number Publication date
EP0484487A1 (en) 1992-05-13
DE4016437C2 (en) 1993-12-02
DE4016437C1 (en) 1991-08-08

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