Enhance drilling efficiency in deepwater exploration wells
Vietgazprom drilled two deepwater exploration wells in the Nam Con Son
basin offshore Vietnam. Though both wells had similar engineering designs, the
formations penetrated were vastly different. Despite these differences, the
operator used information gathered in near-real time while drilling the first
well (VGP-131-TB-1X) to identify areas, such as invisible lost time and
execution of operations, that can be improved while drilling the second
(VGP-130-TD-1X).
Implement the OptiWell service to analyze existing well data
The OptiWell service was used in conjunction with the GN4 acquisition
system during the drilling operation. Using the GN4 system, the well operations
analyst in Hanoi received data in real time from the offshore rig. The well
operations analyst worked with the drilling supervisors and engineers to
collate and plot the KPIs while running marine risers on the first well. Once
these data were presented to the customer, the operator determined that the
tripping practices of the first well could be streamlined.
By using the data gathered from the first well, the operator was
able to increase ROP in the second well.
Reduced tripping and on-slip time while increasing drilling
efficiency
The time it took to trip in marine risers in the first well was recorded
and presented to Vietgazprom. In a water depth of 1,638 m, the total tripping
time was 42.9 h and the average on-slip time was 14.58 min.
With a clear set of KPIs derived from the first well, improvements could
be made in the second well, where the water depth was 1,177 m. Marine riser
tripping on the second well took 36.97 h and the average on-slip time improved
to 12.67 min. The campaign was completed within the planned days.
By determining critical KPIs for its drilling and tripping practices,
Vietgazprom was able to reduce its riser running time nearly 14% and average
on-slip time 13%. The deployment of the OptiWell service in this twowell
campaign has equipped the operator with amended techniques that can be applied
in future wells.
