Process and composition for reducing fluid loss in fluids of maintenance of poco and composition of aqueous fluid maintenance of poco

摘要

The fluid loss of aqueous well servicing fluids can be reduced by dispersing therein a cross-linked hydroxyethyl starch and a polymeric component selected from carboxyalkyl cellulose (in which the alkyl has 1 to 3 carbon atoms), xanthan gum and mixtures thereof. The two types of additive interact synergistically.