A Novel Nonaqueous-Inhibitor Squeeze Package for a Water-Sensitive HP/HT Reservoir

摘要

Downhole scale control in Statoil's Asgard field presents a particularly severe challenge.The field is producing from low-permeability formations with a high drawdown through subsea templates.System pressure and temperature changes experienced during production promote formation of carbonate scales,which have been identified in the near-wellbore area and perforated intervals.The high formation temperature and pressure (165degC and 500 bar,respectively) and high chlorite content coupled with the water-sensitive nature of some of the formations create a challenging environment for downhole scale treatments.