Abstract
An experimental study was conducted to investigate the mechanisms of solid particle removal from bed deposits (i.e. bed erosion) in horizontal wells using water and a drag reducing fluid. The cuttings bed erosion experiments were conducted using a 9m long horizontal flow loop with concentric annular geometry (Outer Pipe ID=95mm, Inner Pipe OD=38mm, ID/OD ratio=0.4). The drag reducing additive was a commercially available partially hydrolyzed polyacrylamide (PHPA). Water and two drag reducing fluids with 0.07% V/V and 0.1% V/V PHPA concentrations were used. Critical velocities for the initiation of cuttings movement with rolling, saltation/dunes, and suspension modes were determined and compared when using water and drag reducing fluids as a carrier fluid. Critical velocities for the initiation of cuttings movement were found to be lower with water than that of drag reducing fluid in all transport modes.
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