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The BJ Services Well Cleaning System removes thin, low-permeable filter cake consisting of lost circulation materials, emulsions and other unwanted materials that can have adverse effects on recovery of drilling and completion fluids. It removes mineral and organic oils and thread compounds, as well as chemical residue, and leaves a minimum of contaminants such as formation fines and emulsions of drilling-mud particles that cause formation damage. The system comprises a suite of four mechanical wellbore cleanup tools.
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