EP3173577A1 - Dispositif d'inspection visuelle d'un trou de mine - Google Patents

Dispositif d'inspection visuelle d'un trou de mine Download PDF

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Publication number
EP3173577A1
EP3173577A1 EP16200501.1A EP16200501A EP3173577A1 EP 3173577 A1 EP3173577 A1 EP 3173577A1 EP 16200501 A EP16200501 A EP 16200501A EP 3173577 A1 EP3173577 A1 EP 3173577A1
Authority
EP
European Patent Office
Prior art keywords
housing
light source
transparent
borehole
viewing window
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
Application number
EP16200501.1A
Other languages
German (de)
English (en)
Other versions
EP3173577B1 (fr
Inventor
Johannes WEGERT
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.)
OMV Exploration and Production GmbH
Original Assignee
OMV Exploration and Production GmbH
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 OMV Exploration and Production GmbH filed Critical OMV Exploration and Production GmbH
Publication of EP3173577A1 publication Critical patent/EP3173577A1/fr
Application granted granted Critical
Publication of EP3173577B1 publication Critical patent/EP3173577B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/002—Survey of boreholes or wells by visual inspection

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • a device In the visual examination of boreholes, a device is guided into a borehole, which is intended to illuminate the inside of the borehole on the one hand by means of a light source and, on the other hand, to visually detect it.
  • a light source In this case, either images and / or video recordings of the inside of the borehole are recorded, which are either stored in a storage medium or sent directly (live) to a playback device.
  • a device of this kind is from the DE 10 2012 223 458 A1 known, wherein a video probe for the inspection of boreholes is disclosed.
  • the video probe comprises a housing in which a video camera, an image memory, a power source and a light source are accommodated.
  • the housing is pressure-sealed with a lid, wherein the lid has fastening means for attaching a rope.
  • the housing has a removable window component, which can be screwed to the housing, wherein the window component is made of glass or acrylic glass. Behind the window component, inside the housing, the light source and the camera are arranged, wherein the light source emits light in the direction of the field of view of the camera, through the window component.
  • the reflector has an elliptical shape and focuses the light emitted by the light source in a focal point.
  • a light guide which is arranged in the focal point, directs the light to a distal end of the housing, on which a camera is arranged.
  • a lens is arranged, which aligns the light in the direction of the field of view of the camera.
  • a disadvantage of the devices disclosed in the prior art is the fact that the light source is arranged inside or behind a transparent element, whereby that of the Light source radiated light on the inside of the transparent element is partially reflected in the direction of the camera. As a result, the quality of the recorded images is degraded because the reflected or reflected light blends the lens of the camera. As a result, the recorded data can usually become unusable or not evaluable.
  • the window element consists of a transparent solid body made of plastic or glass, which is damaged when moving the device in the borehole more due to projecting rock elements or the like in a relatively simple manner. If the window element has cracked, no meaningful recordings of the borehole can be taken disadvantageously with the device, so that considerable time and cost is lost in preparation for the investigation of the borehole. In addition to the cost associated with repair or the purchase of a new device therefore usually the investigation of the well must be repeated, resulting in a significant increase in costs.
  • the object of the present invention is to eliminate or at least mitigate at least individual disadvantages of the prior art.
  • the invention is therefore particularly aimed at providing a device for the investigation of a borehole, with which a uniform and sufficiently bright illumination of the borehole takes place, so that reliable images can be taken in a quality enabling an analysis of the borehole.
  • the risk of damage to the viewing window should be reduced.
  • the device head essentially consists of an intransparent material, in which a preferably circular central viewing window made of a transparent material is accommodated, the device head being accommodated in the non-transparent material has at least one passage opening which is laterally spaced from the viewing window and in which at least one light source is accommodated.
  • the device according to the invention comprises a housing which has a camera, an electronics unit and a power supply unit, wherein the housing is preferably cylindrical in shape due to the shape of a borehole.
  • the housing is made of a pressure resistant material which withstands physical conditions within a wellbore .
  • the power supply unit is preferably a battery, with which the electronics unit and the camera are supplied with energy.
  • the electronics unit is in particular provided to control the functions of the camera and the light source and to store the acquired data or to send it directly to a data evaluation unit outside the borehole.
  • the data transmission can preferably be done with a cable or wirelessly.
  • the housing has a suspension device on which preferably a cable, a wire and / or a corresponding cable, for example a fiber optic cable, are arranged for data transmission.
  • a suspension device on which preferably a cable, a wire and / or a corresponding cable, for example a fiber optic cable, are arranged for data transmission.
  • the cable for data transmission is preferably connected at one end to the device and at the other end to a data evaluation unit which stores, analyzes and reproduces the data recorded by the camera.
  • the device can in particular also be supplied with power with the cable, as a result of which the power supply unit can be dispensed with.
  • the housing has at the opposite end to a device head, which made of an opaque material and having a transparent material consisting of, preferably circular, central viewing window.
  • the viewing window is therefore circumferentially of the non-transparent material at least partially, preferably fully enclosed. If the device moves in the borehole, Particularly when the device is lowered laterally abuts or strikes the rock surrounding the borehole, the viewing window advantageously does not come into contact with the rock, which at most is pointed, has protrusions. Thus, the risk of damage to the viewing window can be significantly reduced.
  • the viewing window is located substantially in the field of view of the camera, so that image data from the inside of the borehole can be detected.
  • the device head additionally has at least one passage opening, which is laterally spaced from the viewing window and in which at least one light source is accommodated.
  • the through-hole is therefore advantageously formed in the manner of a channel enclosed in the intransparent material of the device head.
  • the arrangement of the light source in a separate passage opening in the non-transparent device head unwanted scattering of the light, whereby unwanted reflections can be effected, can be avoided.
  • the light emitted by the light source thus penetrates the device head in a directed manner, thus enabling a precise illumination of the borehole and, subsequently, a high-quality image recording.
  • the camera may be disposed in the device head.
  • the device head is substantially formed as a separate element from the housing, which is preferably connectable to the housing by means of a screw connection.
  • sealing elements may be provided to ensure a tight connection between the device head and the housing.
  • the preferably sealed with sealing elements screw connection between the device head and the housing, the components of the device are protected by the physical conditions within the borehole.
  • the device head is integrally formed with the housing.
  • the passage opening in particular at least a portion of the longitudinal extent of the passage opening, which has no light source, preferably completely filled with a transparent potting compound.
  • the passage opening is closed and sealed, at the same time a directed passage of light is made possible.
  • the light source is fixed with a transparent potting compound in a portion of the longitudinal extent of the passage opening.
  • the non-transparent material preferably has a higher breaking strength, in particular a higher compressive strength, than the transparent potting compound.
  • a metal, an alloy or a composite material, in particular a steel alloy is provided as the intransparent material. Materials of this type are characterized by a high breaking strength and can withstand the physical conditions inside the borehole.
  • the transparent potting compound is a casting resin, in particular a one- or more-component casting resin based on epoxy, polyurethane, acrylic or silicone.
  • the advantage of a potting compound is that it can be easily processed in a liquid state.
  • the passage opening in the device head is substantially filled with liquid potting compound, which closes the passage opening after curing, seals and protects the light source against mechanical stress, temperature, pressure, dirt and the like. Due to the transparency of the potting compound, the light of the light source can be radiated into the interior of the borehole.
  • the central viewing window consists of a transparent alkali silicate glass, acrylic glass, borosilicate glass or quartz glass. Glasses of this type have the advantage that they are mechanically strong and thus can be used inside the borehole. The exact composition of the glass used and its thickness is preferably to be selected according to the physical conditions inside the borehole.
  • a light source in particular a light-emitting diode
  • each passage opening is accommodated in each passage opening.
  • this preferred arrangement of the light sources minimizes the amount of reflected light since each light source is fixed in a separate through hole in the non-transparent device head with a transparent potting compound.
  • the light source arrangement is advantageously spatially separated from the camera by an intransparent material and the light is thus emitted in a predetermined direction.
  • the individual light sources are preferably arranged in separate holding elements, wherein in each case a holding element is arranged in a passage opening.
  • the holding member is fixed in the through hole with a tight screw connection and has at one end a transparent lens which focuses the light emitted from the light sources in an excellent direction.
  • the holding elements are each separately removable from the device head, so that the replacement of individual LEDs can be done very easily.
  • the longitudinal axis of the passage opening in each case at an acute angle ⁇ , preferably between 15 ° and 35 °, to the longitudinal axis of the housing arranged.
  • ⁇ preferably between 15 ° and 35 °
  • the light is radiated at an angle to the longitudinal axis of the housing, whereby the illumination of the borehole is laterally improved by the device. Since the visual inspection specifically targets the inside of the borehole, illumination from the side of the device is particularly advantageous.
  • a light-emitting diode is preferably provided as a light source. Due to the small size of LEDs, a plurality of LEDs, preferably three to twelve, are arranged in an equal number of through holes in the device head. This increases the luminosity and thus improves the wellbore illumination, the size of the device being small enough to be routed into the wellbore.
  • a detachable connection preferably a screw connection with at least one sealing element, is provided between the suspension device and the housing.
  • the connection can be designed analogously to the screw connection between the housing and the device head.
  • the suspension device and the housing are integrally formed.
  • the power supply is provided in the housing for powering the light source in the device head, a conductive contact being closed when the housing and device head are connected together, preferably with a spring disposed between the camera and the electronics unit. Due to the additional force of the spring, the contact, while the device head and the housing are engaged with each other, remains upright even under mechanical loads. In addition, a possible movement of the individual components within the housing is damped by the spring, whereby it does not cause any damage within the housing during abrupt changes in the movement of the device comes through an uncontrolled movement of the components.
  • the power supply is carried out with a cable which is guided into the borehole together with the rope on which the device is suspended. This ensures a battery-independent power supply.
  • the suspension device and the housing essentially consist of a metal, an alloy or a composite material. Materials of this type are characterized by high mechanical strength and are therefore ideal for use in the interior of a borehole.
  • the visually acquired data of the camera are preferably stored in a data memory, which is arranged within the device, in particular within the camera, wherein the stored data at a later time after the investigation of the borehole is completed, are evaluated.
  • the image and / or video data is sent directly (live) to a playback device. This can be done with a suitable cable or wirelessly. In this embodiment can be dispensed with an additional data storage.
  • Fig. 1 shows a device 1 for the visual examination of a borehole 22 (see. Fig. 8 ), which has a camera 2, an electronic unit 3 and a power supply unit 4.
  • the electronic unit 3 and a power supply unit 4 are arranged in a pressure-resistant, cylindrical housing 5, the device 1 having at one end a suspension device 6 and at one opposite end a flameproof cylindrical device head 8 comprising a viewing window 7.
  • the device head 8 is made of a steel alloy, in particular of a corrosion-resistant austenitic-ferritic steel or a nickel alloy, preferably stainless steel W-No. 1.4462 or the highly corrosion-resistant nickel-based alloy W-No. 2.4602, ie an opaque material, in which passage openings 10 are provided, which are laterally spaced from the viewing window 7.
  • Stainless steel W-No. 1.4462 is an austenitic-ferritic steel with essentially 40-50% ferrite and a high resistance in media containing chloride. Due to the high total content of chromium and molybdenum, this stainless steel has a very good pitting resistance and high resistance to stress corrosion cracking and vibration cracking corrosion.
  • the nickel-based alloy W-No. 2.4602 features by the addition of chromium, molybdenum, tungsten and a controlled iron content with excellent resistance to oxidizing, reducing and mixed acids.
  • the alloy is also very resistant to pitting and crevice corrosion, especially in an acid-halide climate.
  • the device head 8 can be connected to the housing 5 via a screw connection 11 which has sealing elements 12.
  • a spring 26 is arranged between the camera 2 and the electronic unit 3 and / or between the electronic unit 3 and the power supply unit 4.
  • the spring 26 serves as a damping unit to protect the individual components within the housing 5 against possible damage. Abrupt changes in the movement of the device 1 may lead to collisions of the individual components which are arranged within the housing 5. By the spring 26 unwanted movements of the components are damped, whereby damage due to collisions are avoided.
  • Fig. 2 shows the housing 5, wherein at a first end 13 via the screw 11 of the device head 8 can be arranged and at a second end 14 via a further screw 15, the suspension device 6 can be arranged.
  • Fig. 3 shows the suspension device 6, which via the screw 15, which sealing elements 16, with the housing 5 is connectable (see. Fig. 1 ).
  • a connecting element 17 is arranged, on which a cable and / or a cable (not shown) can be arranged.
  • the through holes 10 are arranged at an angle ⁇ of about 15 ° to 20 ° to the longitudinal axis x of the device 1.
  • a light source 9 is arranged in a transparent potting compound 27.
  • the device head 8 has an outer cylindrical shell of the relatively break-resistant steel alloy, so that at a possible (lateral) striking the device head 8, in particular when lowering the device 1 in the borehole 22, on rock elements or other sharp-edged projections only of the steel alloy existing device head 8 comes in touching contact with any projections in the borehole 22.
  • the viewing window 7 and the sealing compound 27 received in the passage opening 10 are thus protected by the device head 8 which surrounds it, so that the risk of damage to the transparent materials is extremely low.
  • Fig. 5 shows an alternative embodiment of the device 1, wherein the camera 2 is disposed within the device head 8.
  • Fig. 6 shows a detailed view of the device head 8.
  • the light sources 9 are in turn arranged in each case in a passage opening 10.
  • the passage openings 10 are not filled with a transparent potting compound 27, as in the embodiment according to the Figures 1 to 4a but the passage openings 10 are provided with closure elements 18, which are each connected by means of a screw connection with the passage opening 10.
  • closure elements 18 have an outer nut-like threaded portion 18 'with a central opening, in which a transparent viewing window 18'', preferably made of an alkali silicate glass, acrylic glass, borosilicate glass or quartz glass, is added.
  • the through-openings 10 can thus be closed in a pressure-tight manner in a particularly simple manner, compared to a pressure-tight closing of the through-openings 10 with a transparent potting compound 27, as in the embodiment according to FIGS Figures 1 to 4a
  • these windows 18 have a larger footprint, so that they can be used in particular in devices 1 with an outer diameter greater than 70mm, eg 90mm.
  • the viewing window 7 is accommodated in a substantially identically constructed, central closure element 20 of larger diameter.
  • the device head 8 is analogous to the embodiment according to Figures 1 to 4a via a screw 11, which has sealing elements 12, connected to the housing 5.
  • Fig. 7 shows a plan view of the device head 8 of the alternative embodiment according to Fig. 5 and 6 ,
  • the holding elements 18 are arranged at equidistant intervals around the viewing window 7, which in turn is accommodated in a further holding element 20.
  • Fig. 8 shows schematically the course of a borehole investigation.
  • the device 1 is guided on a rope 21 in a borehole 22, wherein a centralizer 23 ensures a uniform distance of the device 1 to the inside of the borehole 22.
  • the vertical depth of the device 1 is controlled by a winch 24.
  • the evaluation of the visual data recorded during the borehole examination is carried out with a data evaluation unit 25.

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
EP16200501.1A 2015-11-24 2016-11-24 Dispositif d'inspection visuelle d'un trou de mine Not-in-force EP3173577B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT7622015 2015-11-24

Publications (2)

Publication Number Publication Date
EP3173577A1 true EP3173577A1 (fr) 2017-05-31
EP3173577B1 EP3173577B1 (fr) 2018-06-20

Family

ID=57394470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16200501.1A Not-in-force EP3173577B1 (fr) 2015-11-24 2016-11-24 Dispositif d'inspection visuelle d'un trou de mine

Country Status (1)

Country Link
EP (1) EP3173577B1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130287380A1 (en) * 2010-11-19 2013-10-31 E.V. Offshore Limited Optical element
DE102012223458A1 (de) * 2012-12-17 2014-06-18 Rohöl-Aufsuchungs Aktiengesellschaft Videosonde und Verfahren zur Inspektion von Bohrlöchern
US20150077537A1 (en) * 2012-03-29 2015-03-19 E.V. Offshore Limited Camera assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130287380A1 (en) * 2010-11-19 2013-10-31 E.V. Offshore Limited Optical element
US20150077537A1 (en) * 2012-03-29 2015-03-19 E.V. Offshore Limited Camera assembly
DE102012223458A1 (de) * 2012-12-17 2014-06-18 Rohöl-Aufsuchungs Aktiengesellschaft Videosonde und Verfahren zur Inspektion von Bohrlöchern

Also Published As

Publication number Publication date
EP3173577B1 (fr) 2018-06-20

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