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The recent development of affordable slim-hole imaging probes has ensured these tools a place in many geotechnical investigations.

	Optical televiewer (OPTV) and acoustic televiewer(HRAT) logs provide high-resolution 360 degree oriented images of the borehole walls. Fractures, stratigraphy and 'break-outs' due to down-hole stresses are immediately visible and can be characterised with our comprehensive RG-DIP interpetation package. Two new papers on the site from our in-house expert, Dr Andy Siddans, describe the principles of the tools and RG-DIP software, based on recent case studies. Sample log files and a downloadable viewer are also included.
	OPTV (optical televiewer): more HRAT (acoustic televiewer): more

Designed for slim boreholes or for applications where space is limited (eg. between pump and casing), this new probe provides both down-hole and a 360 degree sideways view from dual cameras. The probe is directly compatible with the Micrologger2 and RG winches/ coaxial cables. All functions including focus, iris, camera orientation and lighting intensity are controllable from the surface. The probe contains internal LED lights for each camera useful in boreholes up to around 150mm in diameter. An optional in-line external lighthead is also available. Video is directly recorded to VHS tape or via the Micrologger to CD or DVD in MPEG format.

Part Number: 03 040 000

Underground boreholes may be drilled in any direction from vertically downwards through horizontal to vertically upwards and offer unique challenges for logging. Pushing the probe to the end of the hole and maintaining water in a borehole drilled vertically upwards while logging are major issues.

A new range of accessories from RG solves these problems. The new RG thruster sub attaches in-line to any RG probe and provides up to 100kg force to propel the probe and cable up to 150m in any borehole. Electrically powered from the logging line, the thruster uses a unique patented soft-contact drive to avoid damage to borehole walls. Once at the end of the hole, the thruster supports the weight of the probe while allowing it to be withdrawn smoothly by the logging winch/cable as data is acquired.

To log a 150m upwards-directed water-filled borehole, the moving logging cable must be sealed against a hydrostatic head of around 250psi. In the RG system, the borehole mouth is closed with an hydraulic packer and a wireline flow tube. High-pressure grease forms a liquid seal around the logging cable, allowing the borehole to be filled with water with the probe and cable already in the hole.

Call for details of custom assemblies

RG's international contract logging service operations have been strengthed recently by the establishment of a new company, RGGA, in Brisbane, Australia.

With two units already committed to contracts and a third under construction, RGGA is well on the way to becoming a serious player in Australian coal and coal-bed-methane logging.

RGGA offers a comprehensive range of logging services based on RG digital technology. This includes the latest acoustic imaging tools as well as the standard nuclear, acoustic and resistivity instruments. The trucks are equipped with 2000m winches and the established Micrologger2 dsp-based logging system.

The RGGA operation is managed by Peter Tighe, a geologist and ex-RG logging engineer, who comes with a wealth of experience working for major international mining companies. Pete's team aims to set new standards of service and technology, currently unavailable in this local market.

RG Geologging Australia Pty Ltd
P.O. Box 1726 Cleveland Qld 4163 Australia
Tel 61 7 3286 9960, Mob 0427 738 272
Email ptighe@rgga.com.au
ABN 60 103 916 981

Over the last few months RG has strengthened its Houston-based operations to improve support to our many American customers. David Lacey, who has spent the last few years looking after RG’s Latin American customers, will now take a wider role as overall Sales Manager for North and South America. David will be assisted by our latest recruits, Carolyn Rogers, Office Administrator, and Michael Chan, Electronics Engineer.

Carolyn has over 17 years experience working for OYO Corporation, where she was the Executive Assistant to the President. Carolyn will help organise day to day operations and client support.

Michael is also an ex-OYO employee and joins RG to undertake equipment maintenance, in our newly refurbished workshop. RG aims to perform most, if not all repairs in Houston, reducing repair times and indeed cost. Michael has been working with RG on a part-time basis over the last few years, and already has a good knowledge of our systems.

Tehnical support will be further improved by RG with the introduction of a new quality and client after-sales service system. Our target is to respond to all enquiries within 24 hours.

Steve Parry, RG (UK)’s Director of Sales & Marketing, has become a regular face in the US office and will continue to assist David and to visit on a regular basis.

It is hoped that these changes will help us serve you better.

Compressed video data is recorded to hard disk for transfer to a CD at the end of logging. A standard CD stores up to 1 hour of good quality borehole video. Video files can be immediately replayed using Windows Mediaplayer. At the end of the survey, the camera can be exchanged for an RG logging probe, converting the Micrologger2 immediately back to a powerful digital borehole logging system.

With internal CD-RW on newer notebooks, direct digital video recording of borehole television on a PC is a convenient alternative to a VCR. A Micrologger2, notebook PC, RG winch and camera simply connect to form a complete high-performance borehole video survey unit. Video and depth are displayed in real time on the PC.

MORE DETAILS ...

A new addition to the RG Ultra-slim probe range, the 25mm focussed induction is designed to for boreholes or plastic casings down to 30mm ID. A natural-gamma measurement is available as an option. The Ultra-slim range now also includes magnetic susceptibility, temperature/fluid conductivity and natural gamma probes.

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The latest low-cost addition to the range of RG winches, the Miniwinch is portable, compact and extremely robust. Its simple 'no-frills' design is virtually maintenance free and aimed at long-term reliability under the severest conditions.

Designed for mobile operation, the winch operates from either a vehicle battery (12VDC - 24VDC) or a mains power unit and achieves up to 30m/min line speed. The Micrologger2, Miniwinch combination scores top marks for performance and value-for-money as the ultimate portable borehole-logging and TV-survey unit.

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RG-DIP Version 6.1, due for release on July 22nd, includes the option of picking fractures from OPTV and HRAT imaging logs automatically. The computation, based on a Hough transform, is robust and greatly speeds initial log interpretation, while still allowing full operator override and editing.

CALL FOR TECHNICAL DETAILS AND CASE STUDY

Two channels, 8" and 32" Normals are now available as an option on the standard digital electric log. The new probe (p/n 250 670 000) includes 16" and 64" Normals, SP, SPR with an optional natural gamma measurement.

MORE DETAILS ...