LOW TOXICITY TERPENE DRILLING FLUID AND DRILLING FLUID ADDITIVE

摘要

A water based drilling fluid comprises 1-8% of an additive comprising saturated terpene, a mixture of saturated terpenes or a mixture of saturated and unsaturated terpenes. The drilling fluid is substantially non-toxic and has an LC-50 greater than 30,000 ppm and preferably greater than 100,000 ppm. The most economic additives are a mixture of saturated and unsaturated terpenes and have at least 30% saturated terpenes. The drilling fluid has the advantage of low toxicity over unsaturated terpene drilling fluids.