QL40-OBI-2G / OBI40-GR-2G | Mount Sopris Instruments

Description

The QL40-OBI-2G and the OBI40-GR-2G are the new generation of slim hole Optical Borehole Imagers. The new system comprises a completely redesigned optical assembly with new electronics. It implements a high resolution CMOS digital image sensor combined with a fisheye lens. The tool produces an extraordinarily clear, sharp, 360° continuous — unwrapped digital picture of the borehole wall, either in air or clear water. Resolutions up to 1800 pixels over the borehole circumference can be achieved which makes it ideal for lithological, mineralogical and structural analyses.

A built in high precision orientation package incorporating a 3-axis fluxgate magnetometer and 3 accelerometers allows orientation of the images to a global reference and determination of the borehole’s azimuth (only applicable in non magnetic environment) and inclination.

The new QL40-OBI-2G is fully digital and can operate on standard wirelines. It is a bottom sub and can be either combined with other logging tools of the QL (Quick Link) product line to build tool strings or operated as a standalone tool.

The OBI40-GR-2G is a standalone tool version integrating a natural gamma sensor thereby enabling the measurement of gamma radiation emitted naturally from within the formations crossed by a borehole.

Also available with UV measurement see QL40-OBI-UV brochure.

Applications

OPEN HOLE

Detailed and oriented structural information
Reference for core orientation
Fracture detection and evaluation
Breakout analysis
Lithology characterizations: Detection of thin beds, foliation, grain size, mineralogy, luminance, determination of bedding dip

CASED HOLE

Casing inspection

Downloads

Technical Specifications

Tool

Diameter: 40mm (1.6”)
Length (min/max): 1.49m (58.7”) / 1.88m (74.0”)
Weight (min/max): 5.3kg (11.7 lbs) / 6.5kg (14.3 lbs)
Temp: 0 - 70°C (32 - 158°F)
Max. Pressure: 200bar (2900psi)

Optical system

Sensor: 1/3” high sensitivity CMOS digital image sensor
Color resolution: 24 bits RGB true colors
Azimuthal resolutions: 120, 180, 360, 600, 900, 1800 points
Vertical resolution: User defined. Function of depth encoder vertical resolution
Light source: High efficiency white LEDs

Natural gamma sensor

0.875” (22.2mm) x 3” (75.6mm) NaI (Ti)scintillation crystal
Integrated (OBI40 GR) or in line sub (QL40 GR)

Orientation sensor

3 axis fluxgate magnetometer – 3 accelerometers

Inclination accuracy : +/- 0.5 degree
Azimuth accuracy : +/- 1.2 degree

Operating conditions

Cable type: Mono, multi-conductor, coax
Compatibility: ScoutPro / Opal (Scout / Bbox / Matrix)
Digital data transmission Telemetry: Variable baudrate telemetry according to cablelength/type & surface system
Logging speed: Variable - function of image resolution, borehole diameter, wireline and surface system model.
Centralisation: Required
Borehole fluid: Dry or clear water
Measurement range: In air and in water : 2.3” to 21” (58 to 530mm)

Principle of measurement

The tool incorporates a 1/3-inch CMOS digital image sensor and matching fisheye optics. The digital image sensor captures the light reflection of the borehole wall through the fisheye lens. The light source is provided by 10 high efficiency LEDs.

The displayed log image is derived from a single annulus extracted from the active pixel array. Azimuthal resolutions available are 120, 180, 360, 600, 900 and 1800 points per recorded circle. By using processed digital images in combination with deviation sensor data, the tool can generate an unwrapped 360° oriented image.

Measurement features

360° RGB true color oriented image
360° real time image filtering to enhance image contrast in dark environment (NEW)
Deviation parameters: azimuth, tilt, tool relative bearing, magnetic field, gravity
3 accelerometer calibrated components, 3 magnetometer calibrated components
Temperature of CMOS image sensor
Natural gamma in cps or API units (optional – OBI40-GR-2G)
Adustable exposure level while logging (NEW)

Optical Televiewer