Application of new treating-agent in high density drilling fluid of Halfaya Oilfield

The geology of Halfaya Oilfield is complicated and there tends to be problems such as bit balling, creepage hole shrinkage, pollution of high density drilling fluid by high concentration Ca2+ during the drilling. The difficulties in maintenance of drilling fluid are inhibition of soft mudstone distribution, stabilization of pH value and elimination of Ca2+. Through selection and optimization of treating agent of drilling fluid, BZ-HIB and BZ-DCA are introduced and technical measures are improved to solve the problems with control of rheological property of high density mud, stabilization of pH value, and elimination of Ca2+. It has significant effects on increase of drilling rate and reduction of difficulty in maintenance.