An on-line linear X-ray apparatus has been used to examine deep bed filtration during water injection in Bentheimer sandstone core samples.Hematite particles suspended in brine were injected at different flow rates and concentrations to investigate the deposition profile.The X-ray attenuation is strongly related to the density; and therefore the amount of deposited material can quantitatively be estimated at any time and distance along the core sample.Deep penetration can be distinguished from external filtercake buildup. Permeability decline as determined by the pressure change and chemical analysis of hematite concentration were used to confirm the X-ray analysis.

Keywords:
x-ray signal, absorption coefficient, thickness, core analysis, impairment, deposition profile, particle, hematite, apparatus, drilling fluid chemistry
Subjects:
Drilling Fluids and Materials, Improved and Enhanced Recovery, Formation Evaluation & Management, Environment, Drilling fluid selection and formulation (chemistry, properties), Waterflooding, Core analysis, Water use, produced water discharge and disposal
Copyright 2005, Society of Petroleum Engineers
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