Looping subsea flowlines is one method being utilized for flow assurance. Looping allows the possibility of circulating chemicals and/or tools to remediate partial flowline blockages due to wax, paraffins, asphaltenes, hydrates, sand and scale. This study considers if flow testing can provide an a priori knowledge of the presence and/or size of the partial blockage before remedial action is taken. The techniques developed are for single-phase liquid flow and can be applied during circulation operations in looped flowlines or in single-phase oil transportation lines. Using these models a blockage map is created to indicates what size of blockage can be detected and what size of blockage can be characterized as to length and diameter of the restriction. Field-scale verification was obtained by placing fixed length and diameter partial blockages in the 9,460-ft LSU flowloop (3.64-inch ID). Tested were conducted with liquid rates to 11 bpm (15,840 bbl/day) and pressures to 4,000 psia.
Flow testing methods to detect and characterize partial blockages in looped subsea flowlines
1999
Seiten
Aufsatz (Konferenz)
Datenträger
Englisch
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