Procédé et fluide à base d'eau utilisant des dérivés cellulosiques modifiées hydrophobiquement comme réducteur de filtrat.

摘要

A procedure used in well drilling across at least one geological formation having a given permeability in which one of the following operations is effected : well drilling conditioning and intervention. The permeability of the walls of the drilled well in the formation is controlled by the addn. of a determn. amt. of at least one cellulosic deriv. modified hydrophobically in a vol. of water-based fluid, placed in the well during operation. Also claimed is the fluid compsn. used in the process.