BIODEGRADABLE GRAFT COPOLYMER ANTI-ACCRETION ADDITIVE FOR WATER-BASED DRILLING FLUIDS

摘要

The use of a gelatin-based copolymer containing at least one grafted side chain formed from ethylenically unsaturated compounds as an additive against accretions of clay-containing material is proposed for water-based drilling fluids in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep wells, wherein gelatin has the bloom value of 0 to 100. This copolymer is water-soluble and has good biodegradability.