low colloid oil mud — Oil & Gas Glossary

An oil mud designed and maintained with a minimum of colloid-sized solids, typically by omitting fatty-acid soap and lime, and minimizing organophilic clays and fluid-loss additives. Low-colloid oil mud, also called a relaxed filtrate oil mud, increases drilling rate. A disadvantage is that filtercake formed on sands is not tight, can quickly become very thick, and can cause pipe to