MODIFIED MUD REDUCES BOREHOLE ENLARGEMENT IN EGYPT

02/18/1991
Osama el Ibiary, Ahmed Shimi, Mohamed el Zayat, Hisham Ramadan Wepco Alexandria, Egypt John E. Hostettler Drilling Specialties Co. Bartlesville, Okla. David H. Beardmore Phillips Petroleum Co. Bartlesville, Okla. A redesigned mud system reduced borehole enlargement in shale to an average 2 in. from 8 in. in an Egyptian Western Desert well. At least one of the three main changes that were made in the mud system was responsible for the improvement. The three modifications were: Change the mud from brackish to 15% NaCl Increase the concentration of shale-stabilizing sulfonated asphalt to 6 lb/b...
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