BHTV 42 & 42HT: Acoustic Televiewer

Both versions of the BHTV42 acoustic televiewer tool employ a rotating transducer mounted at the lower extremity of the tool to send a highly focussed ultrasonic pulse radially outwards towards the borehole wall up to 360 times per revolution, the amplitude and travel time of which are measured on its return to the probe after reflection at the borehole wall.

This information, combined with the data given by the tool’s onboard orientation system, provides an extremely detailed and orientated acoustic image of the borehole wall.

A high-temperature variant, the BHTV-HT, can operate at up to 125°C.

Contact us to get a quote or request more information.

BHTV42 & BHTV42-HT SPECIFICATIONS

Technical Specifications

Diameter : 42 mm

Length : 2100 mm

Weight : 8 Kg

Housing : titanium and non magnetic brass

Max. Temp : 70°C / 100°C for BHTV42-HT

Pressure : 200 bar

Sensors Parameters

Transducer type : 1 inch focussed piezocomposite sensor and rotating mirror

Signal frequency : 1.5 MHz

Acoustic beam angle : 3° (3dB) conical

Rotation speed : Up to 20 revolutions per second

Orientation : Triple magnetometers / accelerometers

Amplification : 0 to 60 dB, in 1 dB steps and AGC

Pulses per resolution : 90, 120, 180 or 360 (horizontal definition)

Vertical definition : Unlimited, determined by logging speed

Orientation accuracy : ± 0.5° dipping ; ± 1.0° azimuth

Options And Accessories

Gamma ray sensor: ø25 x 50 mm NaI(Tl) crystal

Centralisers non-magnetic

Bowspring centralisers

Centraliser collar

Weighter (load)

Verticality calibrator

Borehole Conditions

Fluid-filled open borehole: : water or light bentonite mud

Probe must be centralised

Recommended diam. range : 75 à 300 mm

BHTV42 & 42-HT PROBES GALLERY

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Lim designs, produces and commercializes measuring instruments and solutions dedicated to drilling.

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