The operator requested that the Vx Spectra surface multiphase flowmeter
be integrated into its drillout operation along with standard drillout
equipment. The Vx Spectra flowmeter gives an output of three-phase flow rates
in standard conditions through low-energy gamma radiation measurements with
fluid dynamic models. By measuring from a single point in the venturi throat,
the flowmeter is able to constantly determine the precise phase fractions of
water, oil, gas, and solids during the job.
To determine the differential pressures during the job, Schlumberger
set up two pressure sensors on the inlet and outlet of the plug catcher, both
connected to the Vx Spectra flowmeter. Differential pressure acquired by the Vx
Spectra flowmeter was integrated with measured proppant flowback data to
identify when the solids would return to surface. Additionally, coiled tubing
data was used to identify the return time for plug debris and for pumped gel
sweeps. With these advanced data acquisition and evaluation processes, the well
operator was able to obtain better control of the plug drillout process.