OIL BASED DRILLING FLUIDS AND MIXTURE FOR USE IN OIL BASED DRILLING FLUIDS

摘要

The invention relates to an oil based drilling fluid comprising a weighing agent where the drilling fluid contains alcohol ethoxylates with a molecular weigth between 200 and 2000 Dalton as biodegradeable deflocculant. The invention further relates to a dry mixture for use in oil based drilling fluids comprising a weighting agent and a deflocculating agent where the deflocculating agent is alcohol ethxylate with a molecular weight between 200 and 2000 Dalton.