Page 144 - Handbook Of Multiphase Flow Assurance
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140 5. Flow restrictions and blockages in operations
FIG. 5.26 Foam scraper for a 4 in. pipe equipped with water detection, a soluble material (sugar) at front and back.
FIG. 5.27 Water detection scraper after deployment in an 18 × 20 inch multidiameter oil export pipeline.
Asphaltenes
Introduction
Asphaltenes are high molecular weight (300–800, typically 700+ g/mol) hydrocarbons
with polarity (Sheu, 2002). When destabilized, asphaltenes flocculate and deposit from oil
onto production system surfaces, restricting flow, blocking sensors and limiting operability
of valves.
