APPLICATION OF DILUTE SILICATE-BASED DRILLING FLUID SYSTEM IN WELL MAOBA-1

Silicate - based drilling fluid systems have been widely applied in recent years. These systems show strong borehole stability and environmental compatibility. Silicate can react with clay minerals and constrain the hydration of clay, it also can plug the pores and fractures near wellbore. In this paper, the basic Chemical properties of aqueous silicate solutions were described, and the characteristics of dilute silicate - based drilling fluid systems were summarized according to present research results. Dilute silicate - based drilling fluid system was successfully applied to drill through the thick gypsum layers in well ManBa-1.