Enhanced Drilling Performance With Polymer Solutions At Zero Surface Charge Conditions.
Watson-PJ; Pahlman-JE; Tuzinski-PA; Engelmann-WH
Paper in Drilling Symposium 1989 :43-48
In an overall program to increase minerals extraction efficiency, the U.S. Bureau of Mines has investigated the use of chemical additives to enhance drilling performance. Laboratory drilling results have demonstrated increased penetration with simultaneous extension of bit life using various concentrations of chemical additive solutions that produce a zero surface charge (zsc) on the rock. This enhanced zsc-controlled drilling performance was demonstrated for Sioux quartzite, Westerly granite, Minnesota taconite, and Tennessee marble using a variety of chemical additives at their respective zsc concentrations in several waters of varying purity. Penetration improvements with zsc concentration solutions ranged from 84 pct to over 600 pct, while bit life improvements ranged from 77 to over 400 pct for the additives tested. The best additive for enhanced zsc-controlled drilling performance was a high- molecular-weight nonionic polymer, since it sustained the highest enhanced drilling performance over a continuous range of concentrations. These results may have applicability to other processes related to mining and petroleum engineering.
Paper in Drilling Symposium 1989, (Houston, Texas, Jan. 22-25, 1989) ASME, 1988, PP. 43-48