Develop integrated BHA for Kazakhstan wells
Each section of the well was drilled with a PowerDrive RSS or PowerPak
steerable motor, and the real-time and recorded LWD data needed for full
formation evaluation was acquired in all sections. In the 12 1/4-in hole
section, real-time gamma ray measurements helped reduce drilling risks by
successfully identifying the essential 9 5⁄8-in casing point. Smith Bits,
a Schlumberger company, provided 16-in and 12 1/4-in bits optimized for high
ROP and designed an 8 1/2-in PDC bit that could be steered with a PowerPak
motor for the build section.
The BHA for the nonstandard 5 7⁄8-in hole size included an MDi516
PDC bit, 4.75-in OD PowerDrive X6 RSS, an ImPulse integrated MWD platform,
SonicScope multipole sonic-while-drilling tool, and an adnVISION475 azimuthal
density neutron tool.
Save 12 days of drilling time
Each well section was drilled shoe to shoe—with one BHA for each
section—without tool failures, even though the circulation time for the
12 1/4-in and 5 7⁄8-in sections exceeded 250 hours. The well was drilled
12 days earlier than planned with zero NPT.