摘要:
A method for drilling deviated or horizontal wells is facilitated by the use of a scleroglucan-containing aqueous drilling mud. The use of such drilling muds is environmentally and economically advantageous over the use of oil-based drilling muds and is superior to the use of other aqueous-based drilling muds in terms of lubricating power and carrying capacity. Preferably the drilling mud contains unrefined scieroglucan.