The Geochain^TM VSP array has been designed for use in open and cased holes using standard 7 conductor wireline.  The array is based on the field-proven ASR-1 downhole geophone and can be used in wells up to 25,000 psi (1,750 bar) and hole sizes from 3 1⁄2”-22” (89 to 559mm).  The modular nature of the ASR-1 tool allows quick optimisation for various surveys ranging from high temperature deep well check shot to complex high sensitivity micro-seismic monitoring.

All the satellites’ locking arms open and close simultaneously and the entire string can lock into a 9 5⁄8” (244mm) well in only 30 seconds.  All satellites have a failsafe arm mechanism for retrieval of the string in the event of power failure.  All Inter-Tool Cables (ITC) use standard 7 conductor wireline.  The cable heads have graduated weak links and composite pressure bulkhead connectors are used throughout.  A rigid ITC (RITC) option is also available to preserve sensor orientation.