Ensure high production rates by enhancing well placement
Vankorneft was developing an eastern Siberia field using injection,
slanted, and producing wells with horizontal end sections. A main objective of
the project was ensuring high production by optimizing well placement. After
one of the wells was stopped short because the productive formation was
saturated with gas, not oil, service providers began offering corrective
trajectories. However, the operator declined them all because they required
setting the whipstock high inside the casing and losing the ESP zone. A sharp
7°/30-m dogleg directly beneath the casing shoe was proposed to penetrate
the targets—a strategy that would not allow running a motor or
conventional RSS because of torque and drag concerns as well as the risk of not
achieving the required DLS.
Run single-trip solution featuring PowerDrive Archer RSS
Local Schlumberger teams collaborated with Vankorneft and proposed using
the PowerDrive Archer 475 high-build-rate RSS to sidetrack and drill the
planned trajectory in a single run. Running this highly reliable hybrid
steering system would eliminate whipstock operations, reduce BHA trips, and
decrease MD before the landing point. The team also suggested enhancing
geosteering using MWD data acquired by the ImPulse 475 integrated MWD platform,
adnVISION 475 azimuthal density neutron service, and neutron porosity services.
The slimhole combination enabled Vankorneft to optimally land the section.
Engineers from Smith Bits, a Schlumberger company, qualified a
project-specific 6-in PDC bit design (MDi413LKPX) using the IDEAS integrated
drillbit design platform. Additionally, M-I SWACO experts designed FLOTHRU
reservoir drill-in fluid with minimal solids to provide excellent hole cleaning
and a thin filtercake while drilling horizontal reservoir sections in high-DLS
Save 3 days off plan by drilling section in one run
This operation marked the first run of Power Drive Archer 475 RSS in
Russia. Vankorneft drilled the section in a single run, achieving 625 m in 21
drilling hours. The sidetrack was performed from the cement, drilled at the
sharp 7°/30-m DLS, and geosteered in the horizontal section. The operator
saved 3 days against plan and USD 250,000 by eliminating a whipstock operation
and additional BHA runs.