The purpose of this paper is to describe innovative improvements to mud
pulse telemetry in an ultra deep environment. This aligns telemetry services
with the customer need to enhance drilling performance without data quality
sacrifice through mud pulse technology, providing the capability of drilling to
15 km and beyond.
- The MWD pressure pulse signal suffers attenuation and degradation
while traveling uphole. Echoes and reflections, drill pipe ID changes,
pulsation dampener type and mud plastic viscosity, attenuates the pressure
signal up 95% as it reaches surface. Planning becomes keystone for the
telemetry system where;
- Quantification of signal attenuation enables a risk managed
- Hardware, improves MWD Signal detection capabilities.
- Software, allows practical transmission and bandwidth
This effort resulted in the development of comprehensive models for the
telemetry signal; as it evolves with depth and is affected by the different
elements of the drilling system.
- Integrating enhancements in software and hardware resulted in
doubling of MWD transmission data rates.
- Application of compression schemes increasing up to 7 times effective
Successful drilling of deep wells relies heavily on the planning stage,
to extract the maximum value from the drilling investment. The initiatives
outlined in this paper expand the operating envelope of the more applicable
telemetry technology, supporting the new depth limits to be set. The effort of
this investigation delivered a reliable, high band-width transmission system
designed for wells targeting 15km reach and beyond.
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