Optimizing cleanup duration with multiphase flowmeters
When developing an offshore gas condensate field, quickly producing the
wells is a key objective. After the completion string is run, the wells need to
be cleaned of brine, remaining drilling fluids, acid, cuttings, and debris.
Then the flow can be diverted to the production facility. Faster cleanup
generates earlier returns and saves significant operating costs.
A customer in the Middle East decided to use PhaseTester equipment with
Vx technology to optimize its high-rate gas wells’ cleanup operations.
The wells could be flowed up to 120 MMcf/d, ensuring fast cleanup completion.
Measuring recovered liquid volumes from the well opening in real time optimized
cleanup and reduced the risk of carrying any water, acid, or solid particles to
the production facility while minimizing operations duration.
At the beginning of the cleanup, the well effluent—mainly composed
of brine and drilling fluids—was measured by a by a 29-mm-diameter
[3-in-piping] multiphase flowmeter without any limitation on solids production,
pH, or water cut. Then, when continuous gas reached the surface, the flow was
diverted through a fullbore 88-mm-diameter [8-in-piping] multiphase flowmeter
located upstream the choke for better accuracy of liquids measurement and sent
directly to the flare, without any flow restriction, at high pressure and high
gas rates. Cleanup progress was verified in real time during the entire
operation until it was confirmed that the well effluent was clean enough to be
safely diverted to the production line.