Optimization of Drilling Fluid System for Shallow Extendedreach Horizontal Well in Ordos Basin

Abstract:

In order to solve the hard technical difficulties of wellbore stability, boreholecleaning, lubricating & resistance reducing and reservoir protection for shallow horizontal well drilling in Ordos basin, by the analysis on the geological characteristics of the reservoir and based on the previous use of polymer drilling fluid, MC-VIS, ABSN, nanoemulsion and composite shielding temporary plugging agent were selectively added to develop a nanoemulsion plugging drilling fluid system. On the premise of safety drilling, the core permeability was restored up to 8350%. By the application in Qiping 1, it is showed that the nanoemulsion plugging drilling fluid system can satisfy drilling construction requirements of shallow extendedreach horizontal well in low permeability reservoir and provide technical support for efficient exploiting shallow reservoirs in Ordos.