The GeochainSlim Receiver (GSR) innovative design packages all the functionality of the acclaimed ASR-1 receiver into a much slimmer housing. The GSR tool is a compact three component electromechanical downhole geophone. It is designed for use in wells up to 20,000psi and 195oC (digital) 200oC (analogue) and provides a fast arm cycle time with an arm force to weight ratio of 5:1. It can be easily and quickly converted from an analogue system (up to two tools) to part of a multilevel digital GeochainSlimTM system.
The downhole distributed electronics features 24 bit Delta-Sigma converters along with switchable downhole gain for maximum dynamic range. Continuous PLL synchronisation to the surface clock allows for very long record lengths* with no timing skew.
The GSR is a development of the well tried and tested ESR tool and has been designed so as to require very little servicing. Routine maintenance can be performed in a few minutes and even a complete overhaul can be accomplished in less than an hour.
The GSR comes with a three component sensor pack as standard. The sensors are fixed Quad high sensitivity OMNI-2400 15Hz geophones which are suited to both VSP and fracture monitoring surveys. The sensor pack will work in any orientation from vertical through to horizontal.
An optional gamma ray tool or CCL can be used for depth correlation and line 7 (on hepta cable) is free for use with any third party tools that meet the single conductor power requirements.
A BRAND NEW Slim TCU tension head and motion detector provide real time surface read out to prevent tool hang up is now available . A threshold alarm can be set to warn the wireline operator if tension or motion levels change. Full in-field processing is provided by our highly praised ACQ Software Suite featuring the latest VSProwess processing package.
The standard arm will accommodate boreholes from 1-7/8” to 7” and an extended arm can be used to increase this range to 13”. The locking force is constant to within 20% throughout its operating range and will lock into 3-1/2” drill pipe in fifteen seconds. The arm mechanism has a failsafe feature to facilitate recovery of the tool in the event of downhole failure.
The tool can be used in single or dual tool analogue mode and can be combined with our Gamma Ray tool for depth correlation. The GSR receivers accommodate a modular construction 25’ rigid inter tool connector rated to 20,000 psi, 200oC. This low maintenance item provides precise tool alignment and can be coupled together to give a 50’ spacing.
In digital mode the tool can be combined to a maximum of 62 levels with 200m spacing between levels (all using standard seven conductor wireline throughout).