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40695 06/2014
Results
nn Obtained critical information about
fluid dynamics within the reservoir
nn Established right accurate pressure
gradient information in a wellbore
environment, unfeasible with
wireline tools
nn Reduced uncertainties and decreased
risks, achieving good sample quality
in a single run
Challenges
nn Deviated S-profile well
nn Establishing accurate individual
pressure gradients over thin bed
successions of variable mobility and
different reservoir fluids
nn High level of invasion expected during
clean-up and sampling operations
Baker Hughes solution
nn FASTrak service successfully
recorded 60 pressure tests in a
single run, breaking its own pressure
testing record
nn Secured six representative
fluid samples
nn SmartPad technology contributed
to zero lost seals during pressure
testing and sampling operations
nn Fewer rig days accounted for
an estimated USD 2.2 million
in savings
PetroVietnam Domestic Exploration
Production Operating Company Ltd.
(PVEP POC), working in offshore Vietnam,
deployed the FASTrak™
logging-while-drilling
(LWD) fluid analysis sampling and testing
service while drilling a deviated S-profile well
offshore Vietnam. Ordinarily, a well of this
type would require pipe-conveyed wireline
fluid sampling, adding rig days and increasing
the risk of stuck pipe.
Challenges included establishing individual
pressure gradients and collecting formation
fluid samples over thin bed successions
(centimeter to meter scale), with variable
mobility, and potentially different reservoir
fluids days after the well had initially
been drilled. Additionally, inherent depth
uncertainties in the measurements could
affect the fluid gradient.
The excellent repeatability of the pressures
enabled adjusting formation tops by
reconciliation to pressure profiles. The
reconciliation process could only be achieved
by taking several pressure tests in a single
run. Sixty tests were taken during the single
run—an industry record among competing
technologies in the marketplace.
The process enabled high-quality grading
and a selection of representative sampling
locations. The Baker Hughes SmartPad™
closed loop sealing system prevented
lost seals during the pressure testing and
sampling operation, enabling the acquisition
of 6 oil samples. Lab analysis indicated
approximately 15% water-based mud filtrate
contamination, which was comparable to
wireline runs in the same formation.
The operational efficiency and excellent
sample quality achieved by this first
deployment of the FASTrak service in the
Southeast Asia market saved PVEP POC an
estimated USD 2.2 million.
Baker Hughes Deploys FASTrak LWD Service to Break
Pressure Testing Record, Saves Estimated USD 2.2 Million
Location: Offshore Vietnam
CASE HISTORY| bakerhughes.com