Drill and log in to TD in a single run in extremely high temperature offshore wells
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Drilling in high-temperature, high-cost well environment
South East Asia
An operator wanted to reduce costs and achieve logging objectives on high-temperature wells drilled from a jack up rig in 243 feet (74 meters) of water, offshore South East Asia, where bottomhole temperatures are among the highest in the world.
Past drilling practice for these extremely high-temperature wells has been to drill until standard logging-while-drilling (LWD) tools “temped out,” and then to pick up a dumb iron assembly to drill to total depth (TD). This method of drilling resulted in real-time logging data loss and borehole positioning uncertainty. Another common practice was to extend tool runs as long as possible by employing temperature mitigation practices such as reducing RPM and circulating to cool the tools, but this increased the amount of rig time needed to drill the reservoir section.
In order to help the client prevent these costly measures, Sperry Drilling recommended using the Quasar Pulse M/LWD service, which includes sensors capable of operating in the anticipated bottom-hole static temperature (BHST) of 383°F (195°C).
High-temp M/LWD tools achieved logging to TD in wells
Rig time reduction
USD saved by preventing tool failures
Sperry Drilling ran the Quasar PulseM/LWD service with the AGS™ adjustable gauge stabilizer in five wells from the platform in South East Asia, and successfully drilled and logged in each section.
In one outstanding single-run performance where circulating temperature reached 369°F (187°C), the Quasar Pulse service with rotary AGS stabilizer drilled and logged 7,493 feet (2,284 meters) to TD at 12,946 feet (3,946 meters) for an average rateof-penetration of 101.4 feet (31 meters) per hour.
After excellent performances in all five wells, the client calculated that using the Quasar Pulse M/LWD service from Sperry Drilling saved them approximately USD 1 million and over 100 hours of rig time by reducing the number of wireline runs, eliminating trips for “temped out” tools, and by not having to employ temperature mitigation practices to achieve TD.
