Application of scleroglucan muds to drilling deviated wells

摘要

PCT No. PCT/FR91/01032 Sec. 371 Date Oct. 13, 1992 Sec. 102(e) Date Oct. 13, 1992 PCT Filed Dec. 19, 1991 PCT Pub. No. WO92/11340 PCT Pub. Date Jul. 9, 1992.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.