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APS Technology EM MWD system transmits from 10,104 ft. (3,080 m) TVD in OBM

Thursday, September 3, 2015

APS Technology's SureShot EM MWD system has successfully transmitted from a depth of 10,104 feet (3,080 m) total vertical depth (TVD) in a Canadian well in oil-based mud (OBM). This is the deepest transmission to date for the APS EM system, marking an impressive achievement for EM tools in general.

'We were very pleased with the tool's performance,' said Andy Roberts, APS's EM Project Manager. 'The
signal was strong. We expected a lower frequency and data rate would be necessary at this depth, but we were
able to transmit at 6 bits per second and 6 Hz despite the depth and oil-based mud, which is more difficult for
electromagnetic telemetry.'

'Our patent-pending, quad-channel receiver proved invaluable on this well,' Roberts said. 'The field engineers
were able to compare signals from different antenna pairs seamlessly and quickly zero in on which were
receiving the best as conditions changed. I doubt they would have made it to this depth without it.'

Communicating with the downhole system was accomplished with EM downlink telemetry using a transmitter at
the surface. EM downlinking is faster than a cycling pump or rotation and is achieved without interruption to
drilling operations. Downlinking was typically used to tell the tool to uplink on a different frequency when noise
appeared on the current frequency.

APS's SureShot EM MWD operates at up to 12 bits per second and 12 Hz. Maximum transmit power is 50
watts. It is available in 4.75 in. (121 mm), 6.50 in. (165 mm), 6.75 in. (172 mm) and 8.00 in. (204 mm) sizes.



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