GB2332331A - Borehole imaging system - Google Patents
Borehole imaging system Download PDFInfo
- Publication number
- GB2332331A GB2332331A GB9908441A GB9908441A GB2332331A GB 2332331 A GB2332331 A GB 2332331A GB 9908441 A GB9908441 A GB 9908441A GB 9908441 A GB9908441 A GB 9908441A GB 2332331 A GB2332331 A GB 2332331A
- Authority
- GB
- United Kingdom
- Prior art keywords
- imaging sensor
- downhole imaging
- detector means
- image
- detector
- 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
- 238000003384 imaging method Methods 0.000 title claims abstract description 49
- 239000012530 fluid Substances 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 230000035515 penetration Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 22
- 238000005286 illumination Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 241000239290 Araneae Species 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/02—Prospecting
-
- 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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2423—Optical details of the distal end
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
- G03B37/005—Photographing internal surfaces, e.g. of pipe
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to an imaging system or sensor, particularly for use in oil-filled passages such as wells or pipelines, or for passages containing other similar viscous fluids. There is provided a downhole imaging system which operates in a wavelength region outside of the visible band, preferably in the infrared region, to permit penetration of the surrounding fluid medium, e.g. oil. The data may be transmitted from the sensor in a compressed form.
Description
- 1 Imaging sensnr 2332331 The present invention relates to an imaging
system or sensor, particularly for use in oil-filled passages such as wells or pipelines, or for passages containing other similar viscous fluids.
Imaging sensors are well-known devices which comprise an optical system, a detector and electronics to provide at a remote point a representation of the image seen by the sensor. An imaging sensor forms the heart of a video camera system which is used in wells or pipelines to provide, outside the hole or pipe, e.g. on a screen or monitor, a visual image of the situation at a point of interest in the hole or pipe.
Early systems for surveying wells used mechanical arrangements for.photographing the inside of a well and for providing television images of the inside of the well. Such systems are disclosed, for example, in US 2,632,801; US 2,852,600 and US 2,912,495.
It has been realised that the presence of oil may adversely affect the imaging system.
with imaging sensors operating in the visible light wavelength, problems arise because often the fluid medium in which the system is required to operate exhibits little transmission of visible light and/or contains particles or bubbles which cause significant scattering of visible light. Various attempts have been made to overcome the problems caused by oil, etc. inside the wells.
For example, US 2,912,495 discloses a system wherein oil is cleaned from the lens by hydraulic purging.
WO 94/28440 attempts to deal with this problem by providing a chemical surfactant to the surface of the lens to prevent oil, etc. adhering to the lens and thus 2 is to prevent a remote viewing camera from being obscured by oil and other such fluids.
An article entitled "Fiber Optics Improve Downhole Video" by Philip K. Schultz and Charles Cobb in the oil and Gas Journal of 11 May 1992, page 46ff. describes the development of downhole imaging systems. In this article, the problem of oil or other opaque fluids adversely affecting the image obtained is discussed. Generally, as discussed in this article, the opaque fluid has to be displaced and this is most commonly done by pumping filtered brine or other transparent mediums, e.g. nitrogen.
The problem of oil or other viscous fluids obscuring the view of the camera is also discussed in an article entitled "Well Preparation Essential to Successful Video Logging" by J.L. Whittaker and G.D. Linville in SPE 35680.
The problem.is also identified in EP-A-0264511 which discloses use of an arrangement of photosensitive elements in an annular array, together with a system of reflecting elements to obtain a high resolution undistorted view of the inner wall of a cavity.
other systems use particular lighting arrangements in an attempt to improve the image obtained. Some such systems are disclosed, for example, in US 5,402,615 and US 5,663,758.
EP-A-0643198 discloses a video logging system having a remote power source. In this system, the problem of oil, mud, etc. reducing the quality of the image obtained is dealt with by using high intensity lamps.
WO 91/19884 discloses-a video logging system also having a remote power source and using optical fibres to conduct the camera signals to the surface for remote viewing.
All of the above systems, whilst identifying the fact that down-hole images are obscured by oil, mud, 3 - etc. all attempt to deal with this problem by using additional mechanical means or higher power lamps, etc. This all increases the cost, complexity and weight of the imaging system.
The aim of the present invention is to overcome the problems identified above and to enable clear images to be provided to a remote point outside of the well, without the need for additional complex and expensive apparatus.
Accordingly, in one aspect the present invention provides a downhole imaging system which operates in a wavelength region outside of the visible band, preferably in the infrared region, to permit penetration of the surrounding fluid medium, e.g. oil.
In a preferred embodiment, the present invention provides a downhole imaging sensor comprising illuminating means, optical transmission means and optical detector.means operating in the infrared wavelength region, and further comprising circuitry to perform image processing, based on the signals detected by the optical detector means. The image processing circuitry preferably compresses the received signals and transmits them to a remote plane.
The illuminating means, the optical transmission and detector means and the electronic circuitry are preferably all arranged in a protective housing for protection from the operating environment.
In accordance with a second aspect, the invention comprises a method of providing images of the interior of a cavity, comprising transmitting and detecting infrared radiation inside the cavity and providing an image at a remote point according to the detected radiation.
The inventor has discovered that because the sensor operates in this preferably infrared wavelength region, it can capture an image of the scene despite the presence of oil or other fluids which do not transmit sufficient visible light to form a useful image.
The sensor may be provided with means for controlling its movement and position inside the pipe or well. Various means may be used, e.g. a slick wireline, an electric wireline or a fibre-optic wireline. Also, or alternatively the sensor may be attached to a tractor.
Similar means may also be provided to allow power, and/or control information to be transmitted to the sensor, and/or to transmit image and status information from the sensor.
The image processing circuitry may carry out various processing functions to derive useful information from the sensor signals. For example, the processor may determine the volumes of bubbles of different fluids in the surrounding medium and the velocities of those bubble from successive images. The processor may also calculate the flow rates of different fluids in the surrounding medium and record and/or report or display the information.
The image processing circuitry may also locate scattering particles in the surrounding medium by comparing successive image frames and distinguishing the particles by their velocity relative to the sensor. These particles can then be removed from the image.
A preferred embodiment of the present invention will now be described, by way of example only with reference to the accompanying drawings.
Figure 1 is a perspective view of the general arrangement of the main externally visible parts of an imaging sensor according to the invention, in an axialview configuration.
Figure 2 is a perspective view of the general arrangement of the main externally visible parts of the imaging sensor of Figure 1, in a radialview configuration.
Figure 3 is a perspective view of the general - 5 arrangement of the main externally visible parts of the imaging sensor of Figure 1, in a peripheral-view configuration.
Figure 4 is a partial cross-sectional side view of the imaging sensor in a well.
Figure 5 is a partial cross-sectional side view of the imaging sensor in a pipeline.
Figure 6 is a partial cross-sectional side view of one possible configuration of the illumination and the sensor's field of view.
Figure 7 is a partial cross-sectional side view of another possible configuration of the illumination and the sensor's field of view.
Figure 8 is a partial cross-sectional side view of is another possible configuration of the illumination and the sensor's field of view.
Figure 9 is a schematic block diagram of the constituent parts of the imaging sensor using a linear detector array.
Figure 10 is a schematic block diagram of the constituent parts of the imaging sensor using a twodimensional (matrix) detector array.
Figures 11 to 15 show alternative embodiments of the arrangement of the illumination means.
As illustrated in the drawings, the invention is particularly intended for use in well logging, shown in Figure 2, for examining the interior of a well, or in pipeline inspection, shown in Figure 3, for examining the interior of a pipe. The novel aspect is that it operates in the infrared wavelength range of approximately 0.8 micrometres to approximately 2.0 micrometres in order to penetrate the surrounding fluid medium (oil).
The preferred imaging sensor consists of a housing 1 containing the working parts, with the optical assembly or lens 2 at one end of the housing, shown in Figure 1, at the side of the housing as shown in Figure - 6 2, or around the periphery of the housing as shown in Figure 3. The housing 1 also contains the detector and electronics and is releasably secured to the cable, wireline, coiled tubing or well tractor by an attachment 4.
The illuminator(s) 3, of which there may be one or several incorporated, are mounted so as to illuminate the field of view of the optical assembly or lens 2. They may be at one end of the housing as shown in Figure 1, at the side of the housing as shown in Figure 2, around the periphery of the housing as shown in Figure 3 and Figure 8, or mounted remotely from the housing as shown in Figure 6 and Figure 7.
Figures 11 to 15 show further possible arrangements of the illuminator(s) relative to the lens. In Figure 11, the illuminator (3) is mounted on a gas-filled or liquid-filled chamber on the end of the sensor housing. In Figure 12 the illuminator is mounted on a solid transparent component of cylindrical form on the end of the sensor housing. In Figure 13 the illuminator is mounted on a solid transparent component which is separated from the end of the sensor housing by an oilfilled chamber. In Figure 14 the illuminator is mounted on a solid transparent component of spherical, elliptical or parabolic form on the end of the sensor housing. In Figure 15 the illuminator is mounted on a solid transparent component of conical form on the end of the sensor housing. These alternative embodiments will be further described later.
The detector may, for example, take the form of:
a two-dimensional detecting array; or a linear detecting array with a scanning device to scan the image across the array; or a single-point detector with a scanning device to scan the image across the single-point detector.
In a preferred embodiment, the detector is a vacuum tube device which is scanned electronically and has a sensitive front faceplate upon which the image is focussed by the lens.
In well logging as shown in Figure 4, the imaging sensor is attached to a wire-line 6 going to the surface, which provides mechanical control of the movement and positioning of the sensor in the well. attachment 4 may also provide the means of connecting electrical power to the sensor, and/or control signals to the sensor, and/or image signals from the sensor.
Means may be provided to position the sensor radially 7, to centralise the field of view 8 in the bore 5, or to offset the field of view in the bore to concentrate on a particular point of interest.
In pipeline inspection as shown in Figure 5, the sensor housing 1 is releasably attached to a tractor, which provides mechanical control of the movement and positioning of the sensor in the well. The attachment may also provide the means of connecting electrical power to the sensor, and/or control signals to the sensor, and/or image signals from the sensor. A harness 11 incorporating electrical cables, and pneumatic or hydraulic pipes, provides the means for supplying power to the tractor and sensor, controlling signals to them, and image signals back to the external display and recording facility. Means may be provided to position the sensor radially as in Figure 4, or the tractor may provide this facility. This provides for centralising the field of view 8 in the bore 9, or offsetting the field of view in the pipe to concentrate on a particular point of interest.
In order to minimise the losses due to absorption of the illumination by the surrounding fluid medium, the illuminators 3 may be mounted external to the housing 1 as shown in Figure 6. In this example, the illuminators 3 are mounted on the spider assembly 7 used for radial control or centralising of the housing 1 in the bore 9. Electrical cables run through the members of the spider 8 - is assembly 7 from the sensor electronics to supply the power for the illuminators. The beams 12 from the illuminators are orientated so as to illuminate the field of view of the sensor's optical assembly or lens 2.
An alternative external mounting arrangement of the illuminators is shown in Figure 7, in which a pod 13 accommodating the illuminators is held some distance away from the sensor housing 1 by structural members 14 inside which run the electrical cables from the sensor electronics to supply the power for the illuminators. The beams 12 from the illuminators are orientated so as to illuminate the field of view of the sensor's optical assembly or lens 2.
The illuminator and optical part of the imaging sensor can be constructed in various alternative configurations. Figures 11 to 15 show the imaging sensor housing 1 with the lens 2 in a well, pipe or vessel 9 containing a fluid 22 such as crude oil that i opaque to visible light.
Mounting the illuminator away from the imaging sensor housing by a spider of structural members, as shown in Figure 7, results in partial obscuration of the imaging sensor's field of view by those structural members. This problem can be minimised by configuring the optical assembly so that it can support the illuminator, dispensing with the need for any other structural members, as shown in several different forms in Figures 11 to 15.
Some obscuration will still be caused by the electrical wires providing the power from the imaging sensor body 1 to the illuminator 3, but these can be very much thinner than structural members, so the obscuration is very much reduced.
9 This arrangement, in the various configurations shown in Figures 11 to 15, also provides the advantage of reducing the path length of the rays, shown as dashed lines, in the highly absorbing oil 22 in which the imaging sensor is operating. Instead, a significant part of the path length is within highly transmissive gas in chamber 23 ahead of the lens 2. The walls of chamber 23 are of transparent material at the operating wavelengths such as acrylic, fused silica or glass, or have windows of such a material. The benefit is a greater image signal, giving a better picture and allowing the imaging sensor to be used in more highly absorbing oils.
is Figure 12 shows the gas-filled chamber replaced by a solid component 24 made of a material which is highly transmissive at the operating wavelengths such as acrylic, fused silica or glass. That component 24 may be take any of a variety of shapes, to provide differing lens effects and achieve the required performance. For example, Figure 12 shows it as a cylinder, figure 15 shows a cone, and Figures 13 and 14 show a dome which may be of spherical, parabolic or elliptical form.
Figure 13 shows how the component 24 may be separated from the imaging sensor body by a chamber 25, which is open to the surrounding oil. This allows the component 24 to experience an equal pressure from the surrounding fluid on all its surfaces, simplifying its design. The chamber 25 is small, to minimise the path length of the rays in the oil. In this configuration, lens 2 is required to seal the imaging sensor housing from the surrounding oil 22. Because that oil may be at very high pressure, lens 2 is replaced or augmented by a window, transparent at the wavelength of interest, with a pressure seal. This arrangement can be used with any of the shapes for the component 24: a cylinder, a cone, or a dome of spherical, elliptical or parabolic form.
In any form of the imaging sensor, the source of illumination may be any device or combination of devices that provide sufficient output at the desired operating wavelengths, such as lasers, light-emitting solid-state diodes, incandescent lamps and discharge lamps. In figures 11 to 15 inclusive, an incandescent lamp 26 is shown as an example.
In figure 11, the chamber 24 may be liquid-filled rather than gas-filled, with a means of equalising the pressure inside with that of the surrounding oil, so that the chamber walls may be thinner and the chamber easier to produce. The liquid is chosen to be transparent at the operating wavelengths, such as water or light oil. The lens 2 is then augmented or replaced by a pressure-tight transparent window. Such a liquid-filled chamber may be cylindrical, as shown in Figure 11, or may take any of a variety of shapes, to provide differing lens effects and achieve the required performance, such as a cone, or a dome which may be of spherical, parabolic or elliptical form.
11 - CLATMS 1. A downhole imaging system which operates in a wavelength region outside of the visible band to permit penetration of the surrounding fluid medium.
is
Claims (1)
- 2. A downhole imaging sensor as claimed in Claim 1, comprisingilluminating means, optical transmission means and optical detector means operating in the infrared wavelength region, and further comprising circuitry to perform image processing, based on the signals detected by the optical detector means.3. A downhole imaging sensor as claimed in claim 2, wherein the image processing circuitry comprises means to compress the received signals and means for transmitting them to a remote plane.4. A downhole imaging sensor as claimed in claim 2 or 3, wherein the optical transmission and detector means and the image processing circuitry are arranged in a protective housing for protection from the operating environment.5. A downhole imaging sensor as claimed in any of claims 2 to 4, wherein the detector means is provided with means for controlling its movement and position inside a pipe or well.6. A downhole imaging sensor as claimed in any of claims 2 to 5, further comprising means for transmitting power and/or control information to be transmitted to the detector means.7. A downhole imaging sensor as claimed in any of claims 2 to 6, further comprising means for transmitting image and status information from the detector means.- 12 8. A downhole imaging sensor as claimed in any of claims 2 to 7, wherein the detector means is a twodimensional array of pixels.9. A downhole imaging sensor as claimed in any of claims 2 to 7, wherein the detector means is a linear array of pixels with a scanning device to scan the image across the array.10. A downhole imaging sensor as claimed in any of claims 2 to 7, wherein the detector means is a single point detector with a scanning device to scan the image across the detector.11. A downhole imaging sensor as claimed in any of claims 2 to 7, wherein the detector means is an electronically scanned vacuum tube with an infraredsensitive coating,upon which the image is formed.12. A downhole imaging sensor as claimed in claim 4 or any claim dependent thereon, wherein said illuminating means is mounted on a gas or fluid filled chamber provided on the housing such that said illuminating means is spaced from and in front of said detector means.13. A downhole imaging sensor as claimed in claim 4 or any claim dependent thereon, wherein said illuminating means is mounted on a solid transparent member provided on the housing such that said illuminating means is spaced from and in front of said detector means.14. A downhole imaging sensor as claimed in claim 13, wherein said solid transparent member is cylindrical.15. A downhole imaging sensor as claimed in claim 13, wherein said solid transparent member is spherical, 13 - elliptical or parabolic.16. A downhole imaging sensor as claimed in claim 13, wherein said solid transparent member is conical.17. A method of providing images of the interior of a cavity, comprising transmitting and detecting infrared radiation inside the cavity and providing an image at a remote point according to the detected radiation.18. A method as claimed in Claim 17 wherein the detected infrared radiation is transmitted in the form of compressed signals to a remote plane.19. A method as claimed in claim 17 or 18, comprising the steps of determining the volumes of bubbles of different fluids in the surrounding medium and the velocities of those bubble from successive images.20. A method as claimed in claim 17, 18 or 19 further comprising calculating the flow rates of different fluids in the surrounding medium and recording and/or reporting or displaying the information.21. A method as claimed in claim 17, 18, 19 or 20 further comprising locating scattering particles in the surrounding medium by comparing successive image frames and distinguishing the particles by their velocity relative to the detector means.22. A downhole imaging sensor substantially as hereinbefore described with.reference to the attached drawings.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/700,618 US6472660B1 (en) | 1998-05-19 | 1999-05-18 | Imaging sensor |
PCT/EP1999/003407 WO1999060249A1 (en) | 1998-05-19 | 1999-05-18 | Imaging sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9810772A GB9810772D0 (en) | 1998-05-19 | 1998-05-19 | Imaging sensor |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9908441D0 GB9908441D0 (en) | 1999-06-09 |
GB2332331A true GB2332331A (en) | 1999-06-16 |
GB2332331B GB2332331B (en) | 1999-10-27 |
Family
ID=10832343
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9810772A Ceased GB9810772D0 (en) | 1998-05-19 | 1998-05-19 | Imaging sensor |
GB9908441A Expired - Fee Related GB2332331B (en) | 1998-05-19 | 1999-04-13 | Imaging sensor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9810772A Ceased GB9810772D0 (en) | 1998-05-19 | 1998-05-19 | Imaging sensor |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB9810772D0 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2399971A (en) * | 2003-01-22 | 2004-09-29 | Proneta Ltd | Multi-spectral down-hole imaging system |
US11194074B2 (en) | 2019-08-30 | 2021-12-07 | Baker Hughes Oilfield Operations Llc | Systems and methods for downhole imaging through a scattering medium |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115614023B (en) * | 2022-12-16 | 2023-03-10 | 中国石油集团川庆钻探工程有限公司 | Underground visualization system for coiled tubing |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2102565A (en) * | 1981-07-11 | 1983-02-02 | Draftrule Limited | Surface inspection |
GB2107152A (en) * | 1981-10-02 | 1983-04-20 | Rockwell International Corp | Visual inspection system |
GB2111795A (en) * | 1981-11-09 | 1983-07-06 | Rockwell International Corp | Remote visual inspection system |
DE3618624A1 (en) * | 1986-06-03 | 1987-12-10 | Bernd Brandes | Track-laying inspection vehicle for inspecting tunnel-like ducts |
WO1997008633A1 (en) * | 1995-08-29 | 1997-03-06 | Gmi, Llc | Method for randomly accessing stored imagery and a field inspection system employing the same |
-
1998
- 1998-05-19 GB GB9810772A patent/GB9810772D0/en not_active Ceased
-
1999
- 1999-04-13 GB GB9908441A patent/GB2332331B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2102565A (en) * | 1981-07-11 | 1983-02-02 | Draftrule Limited | Surface inspection |
GB2107152A (en) * | 1981-10-02 | 1983-04-20 | Rockwell International Corp | Visual inspection system |
GB2111795A (en) * | 1981-11-09 | 1983-07-06 | Rockwell International Corp | Remote visual inspection system |
DE3618624A1 (en) * | 1986-06-03 | 1987-12-10 | Bernd Brandes | Track-laying inspection vehicle for inspecting tunnel-like ducts |
WO1997008633A1 (en) * | 1995-08-29 | 1997-03-06 | Gmi, Llc | Method for randomly accessing stored imagery and a field inspection system employing the same |
Non-Patent Citations (1)
Title |
---|
WPI Accession No 87-349260 & DE 3618624 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2399971A (en) * | 2003-01-22 | 2004-09-29 | Proneta Ltd | Multi-spectral down-hole imaging system |
GB2399971B (en) * | 2003-01-22 | 2006-07-12 | Proneta Ltd | Imaging sensor optical system |
US7212283B2 (en) | 2003-01-22 | 2007-05-01 | Proneta Limited | Imaging sensor optical system |
US11194074B2 (en) | 2019-08-30 | 2021-12-07 | Baker Hughes Oilfield Operations Llc | Systems and methods for downhole imaging through a scattering medium |
Also Published As
Publication number | Publication date |
---|---|
GB2332331B (en) | 1999-10-27 |
GB9908441D0 (en) | 1999-06-09 |
GB9810772D0 (en) | 1998-07-15 |
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