Abstract:
This study was carried out to assess the rheological properties and filtration loss for a drilling fluid prepared from local bentonite. Required data and sampleswere carfelluy gathered from the study area(Al-fao area) in accord of approved sampling procesdures. Mineralogical, physical, chemical tests were carried out to assess quality of local bentonite. Sodium carboxymethyl cellulose(CMC), polyanionic cellulose polymer(PAC-LV), and sodium carbonate(Na2CO3)wereused to increase viscosity and to decrease filtration losses. The results have shown that the local bentonite can satisfy the American Petroluem Institute (API) specifications for different concentrations of CMC and PAC-LV. Adition of 10% CMC concentration for the selected local bentonite, inhances rheological properties, filter loss and yield point as related to plastic viscosity ratio became within the range of API specifications.
