ZWITTERIONIC POLYMERS COMPRISING BETAINE-TYPE UNITS AND USE OF ZWITTERIONIC POLYMERS IN DRILLING FLUIDS

摘要

The invention relates to novel polymers comprising betaine-type units and to the use of zwitterionic polymers in drilling fluids, for example, as a clay swelling inhibitor and/or as an accretion-inhibiting agent and/or as a fluid-rheology-controlling agent and/or a filtrate-reducing agent and/or a lubricant.