P20 RHEOLOGICAL BEHAVIOUR OF NEW POLYMERS USED IN WATER BASED DRILLING MUDS AND PEFORMANCES 1 A laboratory study has been undertaken to elucidate the influence of structural parameters of polymer/electrolyte systems commonly used for the formulation of water-based drilling fluids on their performances as filtrate reducers or viscosifiers.High temperatures and salt conditions encountered in the well may modify the rheological properties and this makes the use of polymers necessary. High molecular weight polymers (XC gums polyacrylamides have been used in the formulation of waterbased drilling fluids for reducing filtration facilitating clay stabilisation improving débris suspension capacity and drillstring lubrication in


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